WO2016030265A1

WO2016030265A1 - Domestic cooking appliance comprising a steam inlet

Info

Publication number: WO2016030265A1
Application number: PCT/EP2015/069120
Authority: WO
Inventors: Konrad Bleier; Stefan Diederichs; Manfred Hintermayer; Dirk Kesel
Original assignee: BSH Hausgeräte GmbH
Priority date: 2014-08-27
Filing date: 2015-08-20
Publication date: 2016-03-03
Also published as: CN106662339A; DE102014217024A1; EP3186560A1

Abstract

Disclosed is a domestic cooking appliance (1) comprising a cooking chamber wall (2) delimiting a cooking chamber (5), a fan impeller (10) in the cooking chamber (5), a baffle wall (12) which covers the fan impeller (10) in an air-permeable manner, and a steam inlet (19) that has at least one steam inlet port (20) which extends into the cooking chamber (5), in a region (14) between the cooking chamber wall (2) and the baffle wall (12). The invention can be used advantageously especially in an oven having a steam cooking function.

Description

Household cooking appliance with steam inlet

The invention relates to a household cooking appliance comprising a cooking chamber wall which delimits a cooking chamber, a fan wheel located in the cooking chamber, a baffle plate that covers the fan wheel in an air-permeable manner, and a steam inlet with at least one steam inlet opening into the cooking chamber. The invention is particularly advantageously applicable to an oven with a Dampfgarfunktionalität.

There are household cooking appliances of the type in question, in which the steam inlet is directed directly into the cooking chamber. As a result, a cooking result can be negatively influenced, for example by a jet of steam is unevenly introduced into a region of the cooking chamber, in which also food can be located, and / or by larger water droplets contained in the steam settle on the food and there Discoloration (eg stains caused by uneven surface tanning) or even pre-damage.

It is the object of the present invention to overcome the disadvantages of the prior art, at least partially, and in particular to provide a more uniform vapor deposition of the cooking chamber with simple means.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

The object is achieved by a household cooking appliance comprising a cooking chamber wall which delimits a cooking space, a fan wheel in the cooking space, a baffle covering the fan wheel in an air-permeable manner and at least one steam inlet opening into the cooking space, wherein the at least one steam inlet opening into one Area between the cooking chamber wall and the baffle opens. As a result, from the steam inlet opening exiting steam in a through the

Fan air generated Umluftstrom introduced there, swirled there with the circulating air flow and distributed with the circulating air flow considerably more uniformly in the cooking chamber as in a direct direction of the steam jet in an area ("useful area") of the cooking chamber, in which also food can be located. This also increases the probability that larger water droplets settle on the cooking chamber wall instead of being sprayed directly onto the food to be cooked. It is a further development that the fan wheel is arranged on a rear wall of the cooking chamber wall, the baffle wall covers the rear wall and the at least one steam inlet opening opens into a region between the rear wall and the baffle wall. To avoid corrosion of the fan this is preferably made of stainless steel. The steam may in particular have or be steam. The water vapor may in particular be a mixture of air, steam as such (ie, water in the gaseous state of matter) and water droplets, which may also be referred to as steam clouds. The baffle may also be referred to as a cover or as an air baffle. The baffle may be formed as a sheet metal part. It is a development that the baffle is an enamelled sheet metal part. To ensure corrosion resistance to the steam exiting from the steam inlet, not only the front of the baffle wall, but also the back of the baffle wall facing the steam inlet is enameled. Preferably, a thickness of the enamelling of front and back is the same. The thickness of the back side enamelling is in particular between 100 and 300 micrometers, in particular between 150 and 250 micrometers.

It is an embodiment that the at least one steam inlet opening is directed onto an air-impermeable portion of the baffle wall. This will make larger

Water droplets even more effectively kept out of the recirculating air stream, because their impulse directs them directly after exiting a steam inlet opening on the baffle wall and thus hit larger and thus heavier water droplets with a particularly high probability of the baffle. By contrast, lighter water droplets and pure steam are entrained by the circulating air flow.

It is still an embodiment that the steam inlet is oriented perpendicular to the surrounding region of the cooking chamber wall. This allows a particularly short distance to the baffle wall and thus a particularly effective separation of the large reach water droplets. However, the steam inlet or the at least one steam inlet opening may also be directed obliquely into the cooking chamber or obliquely on the baffle wall. There may be a seal between the steam inlet and the cooking chamber wall which seals a gap between the steam inlet and the cooking chamber wall.

It is also an embodiment that the steam inlet is designed as a rivet or in the cooking chamber wall is riveted. Such a steam inlet is particularly vapor-tight and safe against loosening. The steam inlet may e.g. inserted into a corresponding opening in the cooking chamber wall and then by means of a riveting tool, e.g. a rivet tongs, riveted to the cooking space wall. The steam inlet rivet may be provided with a seal which is riveted in. It is a development that the steam inlet is made of stainless steel. Thus, a particularly high resistance to corrosion by steam is achieved. In particular, in order to obtain a beneficial shape for a riveting with a comparatively low effort, the steam inlet is preferably a MIM ("Metal Injection Molding") - component. In particular, an MIM component is produced by means of an injection molding process in which a metal powder provided with a binder is processed. The binder is then removed. This makes it possible to produce complex shaped metal parts in larger quantities with very low tolerances.

It is still a development that the steam inlet is formed on its outside of the cooking chamber protruding portion as a connection for a fluid line, for example as a hose nozzle. It is a development of the fact that the steam inlet on its outside of the cooking chamber projecting portion has a connection region to which a trained as a connection for a fluid line adapter can be connected. The steam inlet may, for example, on its outside of the cooking chamber protruding portion having an external thread for screwing an adapter, for example a hose nozzle. It is a further embodiment that the steam inlet is embedded in the cooking chamber. As a result, obstruction of the circulating air flow between the cooking chamber wall and the baffle wall can be kept particularly low. It is yet another embodiment that the household cooking appliance has a steam generator arranged outside the cooking chamber, which is connected to the steam inlet via a steam supply line. So steam generated by the steam generator passes through the steam supply line to the steam inlet. The higher the pressure in the steam supply line, the higher the momentum of the water droplets emerging from the steam inlet. The invention is particularly advantageous for this embodiment, since on the way of the steam in the steam supply line by a cooling of the vapor can increase a droplet size. The steam generator may be located on a housing bottom of the cooking appliance or above the cooking chamber wall.

It is a development that the at least one steam outlet opening of the steam inlet has a diameter of at least 5 mm, in particular of approximately 10 mm. This ensures a virtually resistance-free passage of steam. For adjusting a shape of the exiting steam jet and / or a speed of the steam, however, the steam inlet can also be designed as a nozzle.

It is also an embodiment that the steam inlet is an atomizer, e.g. a piezo atomizer. By means of the atomizer, an aerosol can be produced with particularly fine water droplets, even without the introduction of thermal energy.

It is also an embodiment that the baffle wall has a recessed central intake area and lateral air outlet openings. So can one

Cooking chamber are particularly fully and uniformly flowed with the circulating air flow and thus also with the steam.

It is also an embodiment that the fan is surrounded by a heater, in particular ring heating. As a result, the cooking appliance can have a hot air function. The at least one steam inlet opening may then be directed in particular to a partial area of the baffle wall adjacent to the ring heating. This has the advantage that the ring heating is not sprayed with water droplets, which prevents calcification of the ring heating and what also reduces a thermal-mechanical stress on the ring heating. In particular, in the case of a ring heating, the baffle may also be referred to as hot air distributor plate, and the fan may be referred to as Heißluftrad.

It is also an embodiment that the baffle substantially completely covers a rear wall of the cooking chamber wall. As a result, the circulating air flow can be guided particularly closely on the other side walls in the case of lateral outflow through at least one lateral gap between the baffle wall and the rear wall.

It is also an embodiment that the household cooking appliance is an oven with a Dampfgarfunktionalität. The cooking chamber may then also be referred to as a stovepipe. The oven may be an oven and / or a microwave oven with a steam cooking functionality. The cooking chamber may also be referred to as a baking oven in the case of an oven, and the cooking chamber as a furnace room. The household cooking appliance may also be an independent steam cooking appliance.

A household cooking appliance may, in particular, be understood as a household appliance, e.g. in the sense of so-called "white goods". The household cooking appliance may e.g. to be a kitchen appliance. The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in conjunction with the drawings. 1 shows a sectional view in side view of an inventive

cooking appliance;

2 shows the cooking appliance in an oblique view of a rear region of an associated cooking chamber with a baffle in a transparent representation; and 3 shows an oblique view of a section through the rear region of the cooking chamber.

1 shows a sectional side view of an inventive cooking appliance in the form of a household oven 1 with a Dampfgarfunktion. The household oven 1 has a muffle or cooking chamber wall 2, which has a feed opening 3 at the front. The loading opening 3 can be closed by means of a cooking chamber door 4. The cooking chamber 2 surrounds a cooking chamber 5, in which through the feed opening 3 to be treated food or food is introduced. The cooking chamber wall 2 has various areas, namely a rear wall or back 6, a ceiling 7, a floor 8 and two side walls 9.

Before the back 6 of the cooking chamber 2 is a fan 10. This is driven by a drive motor 1 1 via a protruding through the back 6 drive shaft. One direction of rotation may be the same or invertible. As a result, a direction of the air flow may also be invertible. The fan 10 is made of stainless steel to show a high corrosion resistance to water vapor.

The back 6 of the cooking chamber 2 is largely covered by a baffle 10 air-permeable covering baffle 12. In an operation of the fan 10, air L from a located between the baffle 12 and the cooking appliance door 4 space area (hereinafter also referred to as "Nutzbereich" 13, in which the food is introduced) in the sub-area or space 14 between the baffle 12 and the back 6 of the cooking chamber 2 is sucked, through a perforated central area 15 of the baffle 12, which is shown in Figure 2 and Figure 3. The perforated central region 15 has in a circular arrangement centrally in the baffle 12 introduced holes 16 and thus can also be regarded as a central intake. The air L sucked into the space 14 can, for example, be pushed out again by a lateral gap 31 between an edge of the baffle 12 and the back 6 of the cooking space wall 2. The absorbed air L can also escape through air passage openings 27 in the baffle, which are shown in Figure 2 and Figure 3. This results in a circulating air flow, which evenly distributes and circulates the air in the cooking chamber 5. The air L or the circulating air stream can be heated, for example, for baking, here by means of a ring around the fan 10 wound around ring heating 17. Das

Fan 10 presses the air L radially through the ring heater 17, so that the air L is heated. This heating can be done as part of a hot air operation. The cooking chamber 5 can alternatively or additionally also be heated by means of a grill heater or a top heat heater 18 (see FIG. 2) and / or by means of a bottom heat heater (not shown).

In the area of the space 14 between the baffle 12 and the back 6 of the cooking space wall 2, a steam inlet in the form of a Dampfeinlassniets 19 is arranged with a front-side steam inlet opening 20. The steam inlet opening 20 opens into the room. As shown in Figure 1, the Dampfeinlassniet 19 is connected via a hose 21 with a steam generating device 22 which is disposed above the ceiling 7. Water vapor W generated by the steam generating device 22 passes via the hose 21 to the steam inlet rivet 19 and is introduced into the space 14 through its steam inlet opening 20. The steam inlet opening 20 here has a diameter of about 10 mm, so that a virtually resistance-free passage of steam is achieved.

The steam inlet rivet 19 is introduced into a recess (not shown) in the rear side 6 of the cooking space wall 2 and is riveted to the rear side 6 there. The Dampfeinlassniet 19 is sealed against the back 6 and against the recess with a seal 24 so that no water vapor W can escape from the recess to the outside. The steam inlet rivet 19 is embedded in a recess 25 surrounding the recess in the cooking chamber wall 2, so that it is flush with the rear side 6 outside the recess 25. As a result, obstruction of the circulating air flow can be kept particularly low.

The Dampfeinlassniet 19 is made of stainless steel, in order to achieve a particularly high resistance to corrosion by the water vapor W. In order to obtain a beneficial shape for a riveting with a comparatively low effort, the Dampfeinlassniet 19 is a MIM ("Metal Injection Molding") - component. The Dampfeinlassniet 19 has on its outside of the cooking chamber 2 protruding portion a screwed adapter in the form of a hose nozzle 26, on soft the hose 21 is attached. Water vapor W exiting into the space 14 through the steam inlet opening 20 has smaller and larger water droplets. The fact that the steam inlet opening 20 is directed directly and perpendicularly to a rear side 30 of the baffle 12, in particular larger droplets can easily get there and settle on the baffle 12. However, in principle, an oblique orientation of the steam jet is possible. The jet of water vapor W is directed in particular to an air-impermeable portion of the baffle 12, so no holes o.ä. having. By contrast, pure steam and finer droplets are entrained by the possibly hot circulating air flow and distributed through the lateral gap 31 into the working area 13. The activation of the ring heating 17 hot air L refines the water vapor W on.

The steam inlet opening 20, however, is not directed to the ring heater 17, so that the ring heater 17 is not sprayed with water droplets, which prevents calcification of the ring heating 17 and what also reduces their thermal-mechanical stress. As a protection against the high temperature frequently occurring in the cooking chamber 5 and as protection against corrosion by the water vapor W, the baffle 12 is a completely enamelled sheet metal part, even on its rear side 30 and in the region of mounting openings 32 on which the baffle 12 is attached to the back 6 of the cooking chamber 2. In particular, the rear side 30 and the useful area 13 facing the front side 28 of the baffle 12 are covered with an at least substantially equal thickness enamel layer. The enamel layer may in particular be between 0.15 mm and 0.25 mm thick, which results in a particularly effective compromise between a material saving on the one hand and a resistance of the baffle 12 on the other hand.

Of course, the present invention is not limited to the embodiment shown. Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more", etc., as long as this is not explicitly excluded, eg by the expression "exactly a ", etc. Also, a number can include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

_{1 Q1 Q}

LIST OF REFERENCE NUMBERS

1 cooking appliance

2 cooking space wall

3 feed opening

4 cooking chamber door

5 cooking space

6 rear wall

7 blanket

8 floor

9 side wall

10 fan wheel

1 1 drive motor

12 baffle

13 working area

14 subarea

15 central area

16 holes

17 ring heating

18 top heat heating

19 steam inlet rivet

20 steam inlet opening

21 hose

22 steam generating device

24 seal

25 deepening

26 hose nozzle

27 light passage opening

28 front side

30 back side

31 column

32 mounting opening

L air

W steam

Claims

1 . Household cooking appliance (1), comprising

a cooking chamber wall (2) which delimits a cooking chamber (5),

a fan wheel (10) located in the cooking chamber (5),

a baffle (12) that covers the fan wheel (10) in an air-permeable manner and a steam inlet (19) with at least one steam inlet opening (20) opening into the cooking chamber (5),

characterized in that

the at least one steam inlet opening (20) opens into a region (14) between the cooking chamber wall (2) and the baffle wall (12).

2. Household cooking appliance (1) according to claim 1, characterized in that the at least one steam inlet opening (20) is directed to an air-impermeable portion of the baffle wall (12).

3. Household cooking appliance (1) according to one of the preceding claims, characterized in that the steam inlet (19) is aligned perpendicular to the surrounding region of the cooking chamber wall (2).

4. Household cooking appliance (1) according to one of the preceding claims, characterized in that the steam inlet (19) is embedded in the cooking chamber wall.

5. Household cooking appliance (1) according to one of the preceding claims, characterized in that the steam inlet (19) is designed as a rivet.

6. Household cooking appliance (1) according to one of the preceding claims, characterized in that the household cooking appliance (1) has a outside of the cooking chamber (5) arranged steam generator (22) with the steam inlet (19) via a steam supply line ( 21) is connected.

7. Household cooking appliance (1) according to one of the preceding claims, characterized in that the baffle wall (12) has a recesses (16) provided with central intake area (15) and lateral air outlet openings (31).

8. Household cooking appliance (1) according to one of the preceding claims, characterized in that the fan wheel (10) by a ring heating (17) is surrounded and the at least one steam inlet opening (20) on an air-impermeable portion of the baffle wall (12) next to the Ring heating (17) is directed.

9. Household cooking appliance (1) according to one of the preceding claims, characterized in that the baffle wall (12) substantially completely covers a rear side (6) of the cooking chamber wall (2).

10. Household cooking appliance (1) according to one of the preceding claims, characterized in that the baffle wall (12) has an enamel coating and a thickness of the enameling of a front side and a rear side (30) of the baffle wall (12) is at least substantially equal ,

1 1. Domestic cooking appliance (1) according to any one of the preceding claims, characterized in that the household cooking appliance (1) is an oven with a Dampfgarfunktionalität.