EP3034952A1 - Oven with a cooking area heated with a gas heating source - Google Patents

Abstract

Stove (1) with a device body (2) and with a hob (3) with at least one cooking point (4) and with a cooking chamber (6) which can be heated via a gas heating source (5) and with an exhaust pipe (7) for guiding the exhaust gas Gas heating source (5) to a gas outlet (8), wherein the gas outlet (8) on a device body (2) arranged on the protective unit (9) is provided. The exhaust pipe (7) is surrounded by a cooling device (10). The gas outlet (8) is associated with a flow constriction (11), so that the exhaust gas (12) cooling air (13) from the cooling device (10) is mixed and an externally touchable surface (14) of the protection unit (9) is kept cooler.

Description

The present invention relates to a stove with a device body and with a hob with at least one cooking point and with a heatable via at least one Gasheizquelle cooking chamber. In this case, the exhaust gas of the gas heating source is led via at least one exhaust pipe to a gas outlet.

In the prior art a variety of stoves with gas-heated cooking chambers have become known, wherein the exhaust gas is discharged via an exhaust pipe to the outside. Often a special steel such as a stainless steel is used at the gas outlet. During operation, the stainless steel can heat up very much, so that there is even a risk of burns if touched. If such a stove with a heated via a gas heating cooking chamber still have a pyrolysis function, this problem is further exacerbated because in a pyrolysis temperatures in the cooking chamber of far more than 400 ° C are generated. Even during normal operation and even more so with possible pyrolysis processes, therefore, the exhaust gas can heat metal surfaces at the gas outlet so far that they discolor.

It is therefore the object of the present invention to provide a stove available in which there is a lower risk of burns when touched.

This object is achieved by a stove with the features of claim 1. Preferred developments are subject of the dependent claims. Further advantages and features of the present invention will become apparent from the general description and the description of the embodiment.

An inventive cooker has a device body and comprises a hob with at least one cooking point. Furthermore, a heating chamber which can be heated via at least one gas heating source is provided. With at least one exhaust pipe, the exhaust gas of the gas heating source is led to a gas outlet. The gas outlet is provided on a protective unit arranged on the device body. In this case, the exhaust pipe is at least partially surrounded by a cooling device and the gas outlet is associated with at least one flow constriction, so that the exhaust gas cooling air is mixed by the cooling device and so that an externally touchable surface of the protection unit is kept cooler. In particular, the externally touchable surface of the protection unit is kept considerably cooler than a externally accessible surface of a protective unit of a conventional cooker without such a cooling device.

The stove according to the invention has many advantages. A significant advantage of the stove according to the invention is that cooling air is provided by the cooling device, which is admixed by the flow constriction of the exhaust gas. As a result, the surface temperature of an externally touchable surface of the protection unit can be kept considerably cooler than in the prior art. Since the exhaust pipe is at least partially surrounded by the cooling device, the hot exhaust pipe is also thermally insulated to the outside.

For the purposes of the present invention, the exhaust gas is understood to be the combustion products. After an admixture of cooling air or other air, the exhaust gas stream consists of a mixture of the original exhaust gas and the admixed air.

In a preferred embodiment, the protection unit is arranged behind the hob. This means that the protective unit is provided in particular at or behind the rear end of the hob. Preferably, at least one operating element is located at the front end or in front of the hob. The operating element is provided in particular at the opposite end of the protection unit.

The protection unit also protects the area located behind the rear end of the cooktop from the effects of heat, for example, through the cooking zones of the cooktop. The cooking zones of the hob can be heated by different types. For example, electrically heated cooktops or inductively heated cooktops can be provided. It is also possible and preferred, however, to provide gas-heated cooktops or cooking zones. It is also possible a mixture, so that some of the cooking zones are heated by gas, while others are electrically and / or inductively heated.

In all embodiments, the protection unit also protects the area located behind the rear end of the hob from splashes during cooking and / or frying and / or from harmful heat.

Preferably, a rear wall of the protection unit is essentially formed by a continuation of a rear side wall of the device body which extends upward beyond the hob. This means that the rear wall of the protection unit can be formed in one piece or in one piece with the rear wall of the device body. This allows a visually appealing design and easier installation.

In a preferred development, at least one inlet opening for cooling air of the cooling device is provided on the exhaust pipe and spaced from the gas outlet. As a result, an effective cooling of the exhaust gas or of the mixture is achieved. Preferably, the distance of the inlet opening from the gas outlet is greater than the diameter or a free dimension of the exhaust pipe. Particularly preferably, the inlet opening is located below the hob or at about the height of the hob. The protection unit extends upwards beyond the hob. A height of the protection unit may be, for example, a few centimeters. In particular, a height of the protection unit is between about 5 cm and 25 cm. A suitable height may be between about 8 cm and 15 cm.

It is also possible that two or more inlet openings are provided at different heights. It is also possible that a further inlet opening is arranged relatively close to the gas outlet. This allows the wall directly around the gas outlet to be cooled once again separately and more strongly.

Preferably, at least one air outlet for cooling air is arranged in a region of the gas outlet. In particular, an air outlet is in an upper area and a further air outlet is arranged in a lower area of the gas outlet. As a result, the directly adjacent to the gas outlet components of the protection unit can be cooled particularly effectively, so that discoloration of z. B. visible stainless steel surfaces on the gas outlet is reliably prevented by temperature wine effect by the exhaust.

In advantageous embodiments, the exhaust pipe is at least about halfway over at least one longitudinal section and in particular at least substantially completely surrounded by the cooling device. For example, the exhaust pipe may be surrounded by about 40% or 60% of the cooling device. In particular, it is also possible that the exhaust pipe is surrounded by 90% or more of the cooling device. This allows a particularly effective cooling. About this structural measure an outer surface of the cooling device is kept considerably cooler than an outside temperature of the exhaust pipe, so that a risk of burns when touching significantly reduced and preferably prevented.

In an advantageous development, the cooling device has at least one cooling channel, which is at least partially formed by the exhaust pipe and the outer walls of the protection unit. In particular, the cooling channel may be substantially completely or even completely formed by the exhaust pipe and the outer walls of the protection unit. As a result, the exhaust pipe is cooled particularly effectively. The cooling channel can in particular lead at least one partial air flow to at least one air outlet, namely in particular to the lower and / or upper air outlet at the gas outlet.

In particular, the cooling device is designed to cool the protective unit in such a way that visible outer stainless steel surfaces of the protective unit do not discolor due to temperature even during a pyrolysis operation. For example, two or more completely or partially surrounding cooling channels may be provided in which the exhaust pipe is centrally received. As a result, a significantly lower surface temperature is achieved on the outer surface of the outer cooling channel than if only one cooling channel surrounds the exhaust pipe. Preferably, the cooking chamber and the protection unit are suitable for a pyrolysis operation. In such embodiments, the outer surfaces of the protection unit may for example consist of stainless steel and it is ensured that in normal operation, the visible and touchable outer stainless steel surfaces are not exposed to such temperatures that tarnishing and thus discoloration of the stainless steel surfaces occurs. In particular, it is also possible to reduce such effects in the pyrolysis operation and / or even completely avoid them.

The gas outlet is preferably arranged on a wall of the protection unit oriented towards the front of the hob. Such an arrangement is advantageous, since thus there is no high heat leakage either to the rear or to the sides. As a result, no special distances to neighboring devices must be complied with and the stove is also suitable for a free-standing installation in the kitchen, for example, a cooking island.

At or in the gas outlet, at least one baffle is preferably provided. For example, a guide plate or it may be provided a plurality of vanes, which align the exhaust flow in particular obliquely upward. This ensures an advantageous distribution of the waste heat.

In particular, at least one additional cooling channel may be provided on the rear side of the protective unit, to which further cooling air is admixed. By means of such an additional cooling channel, the surface temperature at the rear side and / or the upper side of the protective unit can be reduced again, so that there are no or considerably smaller restrictions with regard to the installation and the installation location of such a stove.

Preferably, at least one air outlet for cooling air is provided at the gas outlet of the protection unit. The cooling air can be supplied by the cooling device and is preferably not mixed with the exhaust gas.

In particular, at least one air outlet for cooling air adjoins an outlet region for exhaust gas at the gas outlet at the top and at the bottom.

The protective unit of the stove can also be referred to as a backguard, which is arranged at the rear end of the hob. The protective unit may, in conventional stoves from the prior art, assume tarnish in the exhaust gas outlet region, possibly after a single operation or after a pyrolysis process or the like. In contrast, the temperatures at the touchable vertical and / or horizontal surfaces of the protective unit and / or the device body are considerably reduced by the use of a stove according to the invention, so that there is no longer a risk of burns in the rule. In addition, in normal operation and preferably also in the pyrolysis no discoloration and / or tarnish on.

The hot exhaust gases of the gas heating source are discharged through the exhaust pipe of the oven and in particular introduced into an extension of the exhaust pipe, where appropriate, already a first cooling air flow can be attached. After entering the protection unit, which in particular completely surrounds the exhaust pipe, a cooling air flow is built up around the exhaust pipe, which is sucked in by the flow constriction associated with the gas outlet and the Venturi principle effected thereby. Optionally, it is also possible to actively convey air via the cooling device. Optionally, a second and third cooling air flow is added. In this case, in particular directly at the gas outlet still cooling air can be added at the edge to cool the visible surfaces of the gas outlet and thus to avoid discoloration of the visible surfaces.

Further advantages and features of the present invention will become apparent from the description of the embodiment, which will be explained with reference to the accompanying figures below.

Figur 1

eine rein schematische perspektivische Darstellung eines erfindungsgemäßen Herdes;

Figur 2

eine rein schematische Querschnittsdarstellung der Schutzeinheit des Herdes nach Fig. 1; und

Figur 3

eine vergrößerte Vorderansicht eines Details der Schutzeinheit nach Fig. 2.

In the figures show:

FIG. 1

a purely schematic perspective view of a hearth according to the invention;

FIG. 2

a purely schematic cross-sectional view of the protective unit of the stove after Fig. 1 ; and

FIG. 3

an enlarged front view of a detail of the protection unit after Fig. 2 ,

In FIG. 1 is a single-standing stove 1 is shown in a schematic perspective view here. The hearth 1 has a device body 2, on the upper side of which a hob 3 with a plurality of cooking zones 4 is formed here. The hob 3 has in particular gas-heated Cooking zones 4, but may also include electrically or inductively heated cooking zones or hobs 4.

At the front of the cooking chamber 6 is accessible via a cooking chamber door, which can be opened and closed again by means of a handle. At the top of the cooking chamber 6 is here very schematically at least one gas heating source 5 located, which serves to heat the cooking chamber 6. It is possible to use a single gas heating source. It is also possible to provide a plurality of gas heating sources which can be operated individually or as a whole. At the rear end of the cooking chamber 6 schematically a ventilation device is shown, which can be turned on as needed or on request or according to the program.

At the front here several controls 15 and optionally an indicator are provided. The display provides information about the operating status and further information about the progress and progress of each cooking process.

At the rear end here a protection unit 9 is provided, which is here part of the device body 2 and extends upwardly beyond the plane of the hob 3 also. If necessary, the protective unit can also be referred to as a backguard and is in any case provided here in a rear area behind the hob 3. In preferred embodiments and constructions, the rear wall 16 of the protection unit 9 is formed continuously with the rear side wall 17 of the device body 2. The walls 16 and 17 may be formed integrally or in one piece. But it is also possible that the rear side wall 17 consists of several parts and that one of the parts is integrally or integrally formed with the rear wall 16 of the protection unit 9.

The protection unit 9 is here about to between about 5 cm and 18 cm above the plane of the hob 3 beyond. Other dimensions are possible.

The front or front wall 24, which is facing the hob 3, here has the gas outlet 8 through which the exhaust gases of the gas heating source 5 are discharged. In the interior of the hearth 1 is an in FIG. 1 invisible exhaust pipe 7 (see FIG. 2 ) is provided, with which the exhaust gases of the gas heating source 5 (or the gas heating 5) discharged and discharged through the gas outlet 8 to the outside. In FIG. 1 baffles 25 can be seen, which align the exiting exhaust stream here desired forward and slightly upwards.

Inside the protection unit 9 is an in FIG. 1 unrecognizable cooling device 10 is arranged, which ensures that the lateral, upper and rear outer surfaces of the protection unit 9 during normal operation of the cooking chamber 6 and here preferably also in the pyrolysis by hand without risk of burns can be touched.

FIG. 2 shows a purely schematic cross-sectional view of the protection unit 9 of the cooker 1, wherein schematically below left a Gasheizquelle 5 is located, the exhaust gases 12 are discharged during operation by the adjoining exhaust pipe. Here, a first portion of cooling air 13 is supplied through an inlet opening 18 even in a lower region, so that the hot combustion gases 12 are cooled down early.

As FIG. 2 shows, the protective unit 9 surrounds the exhaust pipe 7 and a vertical longitudinal section 21 of the exhaust pipe 7 front and rear and also on the two sides and thus preferably around it.

At least in the region of the gas outlet 8, a flow constriction 11 is provided, so that the still warm combustion gases are accelerated at least there due to the flow constriction 11, whereby a Venturi effect arises and additional cooling air is sucked in via the cooling channel 22 from the inlet opening 28. In addition, further cooling air is sucked in via the inlet opening 38 and transported through the cooling channel 27. The cooling channel 27 cools the rear side 16 of the protection unit and the upper side 30.

At the air outlet 31 in the lower region of the gas outlet 8, a partial flow of the cooling air exits. At the air outlet 32 in the upper region of the gas outlet 8 also exits a partial flow of the cooling air, which is transported by the cooling channel 27. The exiting from the air outlets 31 and 32 cooling air contains here still no share of the exhaust gas. In other embodiments, a small portion of exhaust gas could be added. In any case, the partial streams at the outlet from the air outlets 31 and 32 are still relatively cool and protect the visible from the outside parts of the wall 24 in the areas 33 and 34 from overheating. The air outlets 31 and 32 thus effectively shield the sections 33 and 34 of the wall 24.

The air flow on the front wall 24, which comes from the inlet opening 28, contributes to the effective cooling of the wall portion 33 on the wall 24 directly below the gas outlet 8 at. In a corresponding manner, the portion 34 of the front wall 24 is cooled above the gas outlet by the partial flow of the cooling air through the cooling channel 27. In the upper part of the cooling channel 27 is still separated by a plate 29 from the top wall 30 at the top, so that the upper wall 30 is considerably cooler than in the prior art. Through the cooling channel 27 and the plate 29, the temperature at the top is reduced so much that there is usually no risk of burns there.

FIG. 3 shows the left edge of the protection unit 9 in an enlarged view, wherein the region 33 of the front wall 24 below the gas outlet 8 and the portion 34 of the front wall 24 above the gas outlet 8 can be seen. In the gas outlet 8 is here a horizontal baffle 25 is provided to deflect the exiting exhaust stream slightly upwards.

Overall, the temperatures at the accessible surfaces in lateral and rear areas of the backguard or the protection unit 9 are considerably reduced by the invention. In normal operation there is no danger of burns if handled properly. Even in pyrolysis operation, the temperature is greatly reduced, so that no discoloration and no tarnishing occur. The risk of burns is significantly reduced. The exiting the cooking chamber 6 hot exhaust gases 12 are passed through the exhaust pipe 7 upwards. The air velocity at the gas outlet 8 leads through the incorporated Venturi nozzle to a negative pressure, the cooling air sucked from below via different inlet openings 18, 28 and 38. The cooling effect is optimized by narrowing the exhaust duct to the end, so that the air velocity of the exhaust gas 12 is still increased. In the outlet region at the gas outlet 8 thus creates a negative pressure region, which ensures that cooling air is sucked in the upper region 32 and in the lower region 31 of the gas outlet. As a result, the optionally still hot exhaust gases have no direct contact with the outer surfaces of the protection unit 9. Thus, the operating temperature of the visible outer surface, in particular the surfaces 24 and the sections 33 and 34 and the walls 30 and 16 is lowered significantly. The risk of burns is considerably lower and there are no discoloration or tempering colors even in pyrolysis operation.

LIST OF REFERENCE NUMBERS

1

stove

2

device body

3

hob

4

cooking

5

Gasheizquelle

6

oven

7

exhaust pipe

8th

gas outlet

9

protection unit

10

cooling device

11

flow constriction

12

exhaust

13

cooling air

14

surface

15

operating element

16

back wall of 9

17

Rear wall of 2

18

inlet opening

19

distance

20

dimension

21

longitudinal section

22

cooling channel

23

wall

24

wall

25

baffle

26

back

27

cooling channel

28

inlet opening

29

sheet

30

top

31

air outlet

32

air outlet

33

section

34

section

38

inlet opening

Claims (12)

Stove (1) with a device body (2) and with a hob (3) with at least one cooking zone (4) and with a cooking chamber (6) which can be heated via at least one gas heating source (5) and with at least one exhaust pipe (7) for guiding the oven Exhaust gas of the gas heating source (5) to a gas outlet (8), the gas outlet (8) being provided on a protective unit (9) arranged on the appliance body (2),
characterized,
that the exhaust gas pipe (7) is at least partially surrounded by a cooling device (10) surrounded,
and that at least one flow constriction (11) is associated with the gas outlet (8),
cooling air (13) from the cooling device (10) is admixed with the exhaust gas (12) and an externally accessible surface (14) of the protection unit (9) is kept cooler. Cooker (1) according to claim 1, wherein the protective unit (9) is arranged behind the hob (3). A hearth (1) according to the preceding claim, wherein a rear wall (16) of the protection unit (9) essentially forms a continuation of a rear side wall (17) of the apparatus body (2) extending beyond the hob (3). Stove (1) according to one of the preceding claims, wherein at least one inlet opening (18) for cooling air (13) of the cooling device (10) is provided on the exhaust pipe (7) and spaced from the gas outlet (8). Characterized in that the exhaust pipe (7) over at least one longitudinal portion (21) at least about half and in particular at least substantially completely surrounded by the cooling device (10). Stove (1) according to one of the preceding claims, wherein the cooling device (10) has at least one cooling channel (22) which is at least partially formed by the exhaust pipe (7) and the outer walls (23, 24) of the protective unit (9). Cooker (1) according to one of the preceding claims, wherein the cooling device (10) is adapted to cool the protective unit (9) such that visible outer stainless steel surfaces (14) of the protective unit (9) do not discolor due to temperature even during a pyrolysis operation. Stove (1) according to one of the preceding claims, wherein the gas outlet (8) is arranged on a wall (24) of the protection unit (9) oriented towards the front in the direction of the hob (3). Stove (1) according to one of the preceding claims, wherein at least one guide plate (25) is provided on the gas outlet (8). Stove (1) according to one of the preceding claims, wherein at least on the rear side (26) of the protection unit (9) an additional cooling channel (27) is provided, the further cooling air is added. Stove (1) according to one of the preceding claims, wherein at least one air outlet (31, 32) for cooling air is provided on the gas outlet (8) of the protection unit (9). Stove (1) according to the preceding claim, wherein at the gas outlet (8) to an outlet region for exhaust gas up and down each followed by at least one air outlet (31, 32) for cooling air.

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