DE102016106239B4 - Hob with a gas burner device - Google Patents

Abstract

Hob (101) with a gas burner device (1) for a household appliance (100) comprising at least one burner head (2) with at least one burner cover (3) with at least one outlet opening (4) and at least one supply device (5), via which at least a gas (6) can be fed to the burner head (2), characterized in that at least one fluidic component (7) is arranged in the burner head (2) and/or in the feed device (5), which is designed as a fluidic diode (60) and/or fluidic switch (70) is formed.

Description

The present invention relates to a hob with a gas burner device. The gas burner device comprises at least one burner head and at least one supply device. The burner head has at least one burner cap with at least one outlet opening. The supply device is suitable and designed to supply gas to the burner head. The gas flowing out of the exhaust port is then ignited, producing a flame at the exhaust port.

Household appliances, such as cooking appliances, dishwashers, washing machines or dryers, often require thermal energy. For cooking appliances such as B. with hobs, for example, a cooking vessel placed on a hotplate of the hob is heated. This can be done, among other things, by directly heating the cooking vessel using thermal energy or by inductive heating of the cooking vessel.

A burner head for a gas hob is from the publication US 2014/0190468 A1 known. The publication shows that such a burner head can be equipped with at least one fluidic oscillator US 5,445,516 A . The functionality of a fluidic oscillator is described in the publication DE 698 26 707 T2 explained.

Depending on the equipment of the hob, thermal energy is used, for example, which is provided by one or more gas burners. Among other things, these have the advantage that the heat supplied can be regulated very precisely and quickly.

However, the disadvantage of such gas burners is that the heat is transferred to the bottom of the cooking vessel relatively selectively. Individual flames are generated, which heat the bottom of the cooking vessel very strongly at certain points at the direct contact point between the flame and the bottom, but otherwise to a lesser extent. This creates hotspots, which lead to uneven heating of the bottom of the cooking vessel and thus the contents of the cooking vessel.

In addition, a gas-air mixture is usually used to generate the flames. However, for a balanced flame pattern, a very homogeneous mixing of gas and air is necessary. This cannot always be guaranteed with known gas burners.

It is therefore the object of the present invention to provide a hob with a gas burner in which the previously mentioned disadvantages are better avoided.

This object is achieved by a hob with the features of claim 1. Preferred developments of the invention are the subject of the subclaims. Further advantages and features of the invention result from the exemplary embodiments.

The hob according to the invention with a gas burner device for a household appliance comprises at least one burner head and at least one supply device. The burner head has at least one burner cap with at least one outlet opening. At least one gas can be supplied to the burner head via the supply device. Furthermore, at least one fluidic component is arranged in and/or on the burner head and/or in and/or on the supply device, which is designed as a fluidic diode and/or fluidic switch.

At least one gas can be supplied to the burner head via the supply device, which then flows out through the at least one outlet opening of the burner cover and is ignited there. In particular, any gaseous fluid or a mixture of gases can be passed through the supply device in order to achieve optimal combustion behavior. In particular, a gas-air mixture is introduced into the burner head via the feed device.

The gas burner device according to the invention offers many advantages. A significant advantage is that various advantageous effects can be achieved by arranging a fluidic component in or on the burner head and/or in or on the feed device of a gas burner device designed according to the invention.

If a fluidic component is arranged in the supply device, a particularly good or homogeneous mixing of different gases can be achieved, for example, so that an optimally mixed gas mixture is supplied to the burner head, whereby a particularly stable flame pattern is generated.

If a fluidic component is arranged in or on the burner head, depending on the design, a particularly advantageous flame pattern can be generated, so that in particular the formation of hotspots, for example on the bottom of a cooking vessel placed on a cooking area, is avoided.

Furthermore, in and/or on the burner head and/or in and/or on the supply device at least one fluidic component is arranged, which is designed as a fluidic oscillator.

The otherwise stable and non-moving flame that is generated at the outlet opening usually creates a thermal hotspot at the point of contact with the cooking vessel above it. By arranging a fluidic component, in particular if it is designed as a fluidic oscillator, on and/or in the burner head, a moving flame image can be generated so that the flames do not statically hit a specific point on the bottom of the cooking vessel. This ensures particularly homogeneous heating of the cooking vessel or the bottom of the cooking vessel and thus the contents therein. Fluidic components can be advantageously used both for a main burner and for secondary burners or simmers.

A particular advantage when using fluidic components, in particular when using a fluidic oscillator, a fluidic switch and/or a fluidic diode, is that a dynamic or moving fluid flow is generated without the need for moving or moving parts are. A dynamic movement can therefore be generated with a static component, with the maintenance effort of this fluidic component being extremely low due to the static component.

The fluidic component is preferably arranged in the burner cover. If a fluidic component, for example a fluidic oscillator, is arranged in or on the burner cover, a moving flame image can be generated particularly advantageously.

Particularly preferably, the fluidic component is designed as a fluidic oscillator, wherein the fluidic oscillator is preferably arranged in the outlet opening and/or wherein the outlet opening is designed as a fluidic oscillator. With such a configuration, depending on the design of the fluidic oscillator, a moving flame image can be generated, so that hotspots are avoided and thus better heat distribution is achieved at the bottom of a cooking vessel. Depending on the design and orientation of the fluidic oscillator, a movement or a uniform swinging back and forth of the flame can be achieved at at least one outlet opening. For example, in a fluidic oscillator with two symmetrically arranged feedback channels, the flame can be swiveled back and forth. Depending on the installation position of the fluidic oscillator or depending on the orientation of the fluidic oscillator, the flame generated at the outlet opening can then pivot from bottom to top or from left to right or also pivot in other orientations. However, embodiments of a fluidic oscillator can also be advantageously used in which the flame image moves asynchronously and/or three-dimensionally starting from the outlet opening, so that, for example, pivoting from left to right and from bottom to top is possible.

In expedient developments, a plurality of outlet openings are provided, which are distributed over an upper section, an inner section and/or an outer section of the burner cover. Then preferably at least one fluidic oscillator is arranged in at least one outlet opening and/or at least one outlet opening is designed as a fluidic oscillator. In such a configuration with several outlet openings, in particular several or even all outlet openings being equipped with a fluidic oscillator or designed as a fluidic oscillator, a particularly homogeneous heating of the bottom of the cooking vessel can be ensured by a moving flame pattern.

It is further preferred that at least one fluidic component is arranged in the supply device. The fluidic component can, for example, be arranged directly on or in the transition to the burner head or in the vicinity of the burner head. However, an arrangement at another location on the supply device can also be advantageously provided. By arranging a fluidic component in the supply device, an optimized mixture of different gases or gaseous fluids can in particular be achieved. For example, an optimized gas-air mixture can be provided, with the fluidic component achieving a particularly homogeneous mixing of air and gas. This allows a particularly stable flame to be generated, so that an optimized flame image is achieved.

Preferably, the feed device comprises at least one mixing tube, with the fluidic component being arranged on and/or in the mixing tube. In such a configuration, a gaseous fluid can be mixed with another gaseous fluid via the fluidic component, so that a particularly homogeneous mixture of the two gaseous fluids is achieved by the fluidic component.

The mixing tube can then preferably comprise at least one central tube into which at least one gaseous fluid, for example a combustible gas and/or air, can be conducted by means of at least one fluidic component. According to the invention, the central tube is in particular a tube shaped structure through which at least one gaseous fluid can be conducted. The central pipe is the pipe into which another gaseous fluid is mixed. The central tube can be arranged centrally or decentrally in the mixing tube.

Particularly preferably, a plurality of fluidic components are arranged essentially radially over the circumference of the central tube. In this way, a particularly effective and uniform introduction of a further gaseous fluid can be achieved, with particularly dynamic mixing taking place, for example through the use of fluidic oscillators, so that very homogeneous mixing takes place in the mixing tube.

The fluidic component is preferably switchable. Depending on the arrangement of the fluidic component in the burner head and/or the supply device, the use of the fluidic component can be switched on and/or off.

The fluidic component is particularly preferably designed as a fluidic oscillator, the deflection of the gas-air mixture or of the gas or gas mixture caused by the fluidic oscillator being adjustable. The movement or deflection of the flame can then be adjusted as required and/or adjusted to specific mixing ratios of different gases used.

Preferably, at least two fluidic components are provided, which are arranged one behind the other. This is to be understood in particular as meaning that the fluidic components are in operative connection with one another, or that a fluid can be conducted from the outlet of a fluidic component into the inlet of a next fluidic component. Through such a cascading arrangement of fluidic components or by connecting several identical or different fluidic components in series, further advantageous effects such as optimized mixing of gas mixtures and/or an optimized moving flame pattern can be achieved.

The household appliance according to the invention comprises at least one gas burner device, as described above. The household appliance according to the invention also offers the advantages already stated for the gas burner device according to the invention.

Further advantages and features of the present invention result from the exemplary embodiments, which are explained below with reference to the accompanying figures.

• 1 eine rein schematische Darstellung eines Haushaltsgerätes mit einer erfindungsgemäßen Gasbrennereinrichtung und eine Explosionsansicht einer erfindungsgemäßen Gasbrennereinrichtung;
• 2 eine weitere rein schematische Darstellung eines fluidischen Bauteils, welches als fluidischer Oszillator ausgebildet ist;
• 3 eine rein schematische eines Brennerdeckels einer erfindungsgemäßen Gasbrennereinrichtung in einer perspektivischen Ansicht, einer Seitenansicht und einer Draufsicht;
• 4 eine rein schematische eines Brennerdeckels eines anderen Ausführungsbeispiels einer erfindungsgemäßen Gasbrennereinrichtung in einer perspektivischen Ansicht und drei Ansichten von der Seite;
• 5 eine rein schematische eines Brennerdeckels eines nächsten Ausführungsbeispiels einer erfindungsgemäßen Gasbrennereinrichtung in einer Draufsicht; und
• 6 eine rein schematische Schnittansicht durch eine Zuleiteinrichtung im Bereich des Mischrohres.

Show in the figures:

• 1 a purely schematic representation of a household appliance with a gas burner device according to the invention and an exploded view of a gas burner device according to the invention;
• 2 a further purely schematic representation of a fluidic component, which is designed as a fluidic oscillator;
• 3 a purely schematic view of a burner cap of a gas burner device according to the invention in a perspective view, a side view and a top view;
• 4 a purely schematic view of a burner cap of another exemplary embodiment of a gas burner device according to the invention in a perspective view and three views from the side;
• 5 a purely schematic top view of a burner cap of a next exemplary embodiment of a gas burner device according to the invention; and
• 6 a purely schematic sectional view through a feed device in the area of the mixing tube.

In 1 A household appliance 100 according to the invention is shown purely schematically, which is designed here as a hob 101 or as a gas hob 102. In the exemplary embodiment shown, the hob 101 has a single hotplate 103, which is equipped with a gas burner device 1 according to the invention. A cooking vessel (not shown in the figures) arranged above the burner head 2 can be heated via the gas burner device 1 or via the burner head 2 of the gas burner device 1.

The hob 101 is also shown in a purely schematic exploded view, in which a gas burner device 1 according to the invention is also shown as an example. It can be seen that the gas burner device 1 according to the invention includes a burner head 2 and a supply device 5. The burner head 2 includes various components which are put together to form a functional burner head 2. In particular, the burner head 2 comprises a burner cover 3, which in the exemplary embodiment shown has outlet openings 4 distributed over an outer section 10.

Gas 6 or a gaseous fluid and in particular a gas-air mixture is supplied to the burner head 2 via the supply device 5. In order to provide an optimally combustible gas 6 or a gas mixture, the supply device 5 includes Mixing tube 11, in which, for example, a combustible gas 12 is mixed with air 13 to form a gas-air mixture.

This gas 6 or the gas-air mixture is then supplied to the burner head 2 and can escape through the outlet openings 4 in the burner cover 3. There the gas-air mixture is ignited, whereby a specific flame pattern is generated on the burner cap 3.

According to the invention, at least one fluidic component 7 can be assigned to the burner head 2 and/or the feed device 5, with different positive effects being able to be achieved depending on the arrangement of the fluidic component.

In the exemplary embodiment shown, several fluidic components 7 designed as fluidic oscillators 50 are assigned to the burner head 2 and in particular to the burner cover 3. In the exemplary embodiment shown, a fluidic oscillator 50 is arranged in each outlet opening 4. According to the invention, a fluidic diode 60 and/or a fluidic switch 70 is also used.

By using fluidic oscillators 50 in the outlet openings 4 of the burner cover 3, an improved flame pattern can be achieved on the underside of a cooking vessel placed on a cooking surface 103. If 4 normal through-holes are provided in the burner cover 3 as outlet openings, a static flame pattern is created at the bottom of the cooking vessel. This results in thermal hotspots at the points of contact between the individual flames and the bottom of the cooking vessel, which means that the bottom of the pot does not heat up evenly and thus advantageously.

By arranging fluidic oscillators 50 in the outlet openings 4 or by providing the outlet openings 4 with fluidic oscillators 50, it is achieved that a dynamic flame image or moving flames can be generated on the burner cap 3. For example, depending on the orientation and design of the fluidic oscillator 50, the flame created at the outlet openings 4 can swing back and forth, so that a more homogeneous heating of the bottom of a cooking vessel is achieved and thus the formation of hotspots is avoided.

It is particularly advantageous that by using a fluidic component 7 or a fluidic oscillator 50 with a static component, a dynamic flame image or a moving fluid flow can be generated. This minimizes maintenance costs, among other things.

In 2 The functionality of a fluidic oscillator 50 is shown purely schematically, as it can be used in a gas burner device 1 according to the invention. The fluidic oscillator 50 is shown in two side sectional views.

The fluidic oscillator 50 includes an input 51 and an output 52, between which a flow section 53 is provided. Two feedback channels 54, 55 are provided on the flow section 53, which are involved in generating a self-oscillating fluid flow 56. A fluid 6, here a gas-air mixture 6, enters the flow section 53 through the inlet 51 of the oscillator.

Due to minimal asymmetrical flows in the flow section 53, at the beginning of the flow there is a slight shift in the direction of flow towards a feedback channel, in the exemplary embodiment shown here towards the feedback channel 54. This results in different flow densities in the feedback channels 54, 55, whereby the fluid 6 is deflected slightly downwards by the pressure in the feedback channel 54 as it enters the flow section 53.

This is in the right illustration of the oscillator 50 in 2 shown purely schematically. The flow shift results in a change in the direction of flow in the direction of the feedback channel 55, which increases the density here, which in turn results in the fluid 6 entering the flow section 53 being pushed slightly upwards via the feedback channel 55 becomes.

This results in an oscillating movement of the fluid 6 within the flow section 53, which in turn leads to a self-oscillating fluid flow 56 which leaves the outlet 52 of the fluidic oscillator 50.

A dynamic fluid flow 56 is thus generated, thereby providing a dynamic flame image. A dynamically emerging fluid flow 56 is achieved without using moving parts.

In 3 is the burner cover 3 of the gas burner device 1 according to 1 shown purely schematically in three different views. In the exemplary embodiment shown, each of the outlet openings 4 is equipped with a fluidic oscillator 50. In other embodiments, only a few outlet openings 4 can be equipped with a fluidic oscillator 50 and/or other fluidic components 7.

The use of fluidic components 7 or, in this special exemplary embodiment, the use of fluidic oscillators 50 in the outlet openings 4 of the burner cover 3 ensures that no static flame image is generated, which only selectively heats the bottom of a cooking vessel. It is indicated in the side view on the burner cover 3 that, depending on the orientation of the fluidic components 7 or the fluidic oscillators 50, an up-and-down movement of the flames generated at the outlet openings 4 is achieved.

The top view of the burner cover 3 indicates that, additionally or exclusively depending on the design and orientation of the fluidic oscillators 50, a sideways movement of the flames generated at the outlet openings 4 can be achieved. This avoids the formation of hotspots on the bottom of the cooking vessel, which results in particularly good and homogeneous heating of the cooking vessel.

In 4 a further exemplary embodiment of a burner cover 3 of a gas burner device 1 according to the invention is shown purely schematically in four different views. In the perspective overview view it can be seen that in the burner cover 3 shown, a plurality of outlet openings 4 are provided on an upper section 8, an inner section 9 and an outer section 10, distributed over the circumference of the burner cover 3, at each of which a flame is generated becomes.

In the exemplary embodiment shown, fluidic oscillators 50 are provided in the outlet openings 4. In the three side views shown of the burner cover 3 of the gas burner device 1 according to the invention, the movement of the individual flames on the different sections 7, 8, 9 is indicated purely schematically.

It can be seen that the flames formed at the outlet openings 4 of the individual sections 8, 9, 10 swing back and forth due to the use of fluidic components 7 or fluidic oscillators 50. In the exemplary embodiment shown, there are overlapping areas of the flames at the outlet openings 4 of the different sections 8, 9, 10. This ensures that a type of dynamic flame dome is created around the entire burner cover 3, which heats a particularly large area of the bottom of a cooking vessel becomes. Depending on the design, the deflection of the individual flames can be achieved by using different oscillators 50 or by adjusting the oscillators 50.

In particular, individual areas can also be specifically left out. For example, the areas of the pot supports can be heated to a lesser extent, while the areas of the bottom of the pot are heated longer or more intensively. This leads to greater energy efficiency because less heat energy is transferred to the mass that is not necessary for the cooking process.

In 5 a further exemplary embodiment of a burner cover 3 of a burner head 2 of a gas burner device 1 according to the invention is shown purely schematically in a top view. Here, another example is shown purely schematically, in which the outlet openings 4 are equipped with fluidic oscillators 50, so that the flames arising at the outlet openings 4 perform a pivoting movement.

The fluidic oscillators 50 in the exemplary embodiment shown are arranged or designed in such a way that the flames pivot in a certain angular range starting from the outlet openings 4. A sideways movement in one direction results in a very homogeneous flame pattern around the entire circumference of the burner cover 3. This may even make it possible for fewer outlet openings 4 to be provided along the circumference of the burner cover 3, since the free spaces between the individual outlet openings 4 are covered by a pivoting movement of the flames.

In 6 It is shown purely schematically that fluidic components 7 can also be used advantageously in the supply device 5. This is in 6 purely schematically a cross section through the mixing tube 11 of a supply device 5 is shown. In the exemplary embodiment shown, a combustible gas 12 is mixed with air 13 in the mixing tube 11, so that a gas-air mixture 6 that is easily combustible for the application is formed, which is fed to the burner head 2.

In the exemplary embodiment shown, the mixing tube 11 comprises a central tube 14 through which the combustible gas 12 is guided in the exemplary embodiment shown. A plurality of fluidic components 7 are arranged around the circumference of the central tube 12 and provide a flow connection between an outer tube 15 and the central tube 14.

In the exemplary embodiment shown, the fluidic components 7 are designed as fluidic oscillators 50, with at least fluidic diodes 60 and/or a fluidic switch 70 being expediently used according to the invention.

By using the fluidic oscillators 50 in the mixing tube 11, a particularly homogeneous mixing of air 13 and combustible gas 12 is achieved, so that a particularly homogeneously mixed gas-air mixture 6 is generated, which ignites optimally at the outlet openings 4 of the burner cover 3 of a burner head 2 can be.

Reference symbol list

1

Gas burner device

2

burner head

3

Burner cap

4

Exhaust opening

5

Feeding device

6

gas

7

fluidic component

8th

upper section

9

inner section

10

outer section

11

Mixing tube

12

flammable gas

13

Air

14

central pipe

15

outer tube

50

fluidic oscillator

51

Entrance

52

Exit

53

flow section

54

Feedback channel

55

Feedback channel

56

self-oscillating fluid flow

60

fluidic diode

70

fluidic switch

100

household appliance

101

Hob

102

Gas cooktop

103

cooking area

Claims (11)

Hob (101) with a gas burner device (1) for a household appliance (100) comprising at least one burner head (2) with at least one burner cover (3) with at least one outlet opening (4) and at least one supply device (5), via which at least a gas (6) can be fed to the burner head (2), characterized in that at least one fluidic component (7) is arranged in the burner head (2) and/or in the supply device (5), which is designed as a fluidic diode (60) and/or fluidic switch (70) is formed. Hob (101). Claim 1 , characterized in that at least one fluidic component (7) is arranged in the burner head (2) and/or in the supply device (5), which is designed as a fluidic oscillator (50). Hob (101) according to one of the preceding claims, characterized in that the fluidic component (7) is arranged in the burner cover (3). Hob (101) according to the preceding claim, characterized in that the fluidic component (7) is arranged in the area of the outlet opening (4) and/or that the outlet opening (4) is designed as an outlet (52) of the fluidic component (7). . Hob (101) according to one of the two preceding claims, characterized in that a plurality of outlet openings (4) are provided, which have an upper section (8), an inner section (9) and / or an outer section (10) of the Burner cover (3) are distributed and that at least one fluidic oscillator (50) is arranged in the area of at least one outlet opening (4) and / or that at least one outlet opening (4) is designed as an outlet (52) of the fluidic oscillator (50). Hob (101) according to one of the preceding claims, characterized in that the supply device (5) comprises at least one mixing tube (11) and that the fluidic component (7) is arranged on and/or in the mixing tube (11). Hob (101) according to the preceding claim, characterized in that the mixing tube (11) comprises at least one central tube (12) into which at least one combustible gas (12) and / or air (13) by means of at least one fluidic component (7 ) can be conducted. Hob (101) according to the preceding claim, characterized in that a plurality of fluidic components (7) are arranged substantially radially around the circumference of the central tube (13). Hob (101) according to one of the preceding claims, characterized in that the fluidic component (7) is switchable. Hob (101) according to one of the preceding claims, characterized in that the fluidic component (50) is designed as a fluidic oscillator (50) and that the deflection of the gas (6) caused by the fluidic oscillator (50) is adjustable. Hob (101) according to one of the preceding claims, characterized in that at least two fluidic components (7) are provided, which are arranged one behind the other.

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