Gas burners and household appliances

Abstract

A household gas burner, particularly for cooking appliances, includes a burner housing having a burner chamber that can be coupled to an optional controlled gas fuel supply device and is openly connected to the environment through a series of flame ports for igniting a gas flame. An inlet device is coupled to the burner housing, the inlet device including an inlet for receiving gas fuel and ambient air, and an outlet for supplying a fuel / air mixture to the burner chamber. The inlet and outlet are openly connected to each other via a fuel passage extending between the inlet and outlet and defined by a wall. The gas port is characterized by opening into the inlet during operation to supply a fuel flow to the inlet, the inlet allowing at least substantially free entry of ambient air, and the inlet device including an auxiliary gas device for generating and maintaining an auxiliary gas flow during operation, the auxiliary gas flowing through the wall of the fuel passage toward the outlet.

Description

Technical Field

[0001] This invention relates to a gas burner, particularly a household gas burner, and more particularly a household gas burner for cooking appliances. The gas burner includes a burner housing having a burner chamber and an inlet device. The burner housing includes one or more flame ports capable of igniting a gas flame. The inlet device has a gas inlet configured to allow a gaseous flow of gaseous fuel to enter and an outlet capable of receiving a fuel / air mixture. The gas inlet and outlet of the inlet device are openly connected to each other via a fuel passage defined by a channel wall. The burner chamber can be connected via the inlet device to an optional controlled gas supply device. The inlet device includes at least one air inlet allowing ambient air to freely enter the gas flow. The invention also relates to a household appliance equipped with such a gas burner. Background Technology

[0002] Household gas burners of the type described in the preamble are known, for example, from U.S. Patent Publication US399948. In such known burners, a gas-air mixture is formed in an inlet device by supplying gaseous fuel and ambient air, and this mixture is conveyed to the burner housing. The ambient air that ultimately enters the gas-air mixture through the inlet device is also referred to as primary air and typically produces a substoichiometric mixture. This gas-air mixture can escape through the flame port and burn outside the flame port. The gas-air mixture based on the combustion of primary air outside the flame port is also called primary combustion, and includes combustible residual gases that will burn simultaneously with the supplied ambient air. This can also be referred to as secondary combustion. This ambient air is also referred to as secondary air. The fuel is preferably completely burned here, and the resulting heat can be released to the bottom of a surface used for heating, such as the bottom of a pan or kettle. The hottest part of the flame is where primary combustion occurs. For optimal heat transfer from the flame to the bottom of the pan, it is important that the bottom of the pan is close to the hottest part of the flame: the part where primary combustion occurs. Here, secondary combustion should not be impeded.

[0003] A gas burner flame has a flame length. The flame length is determined by the outflow velocity of the gas-air mixture and the flame velocity. The outflow velocity is determined by the gas supply to the burner. The more gas supplied, the more primary air is drawn in, and the higher the velocity of the gas-air mixture exiting the flame port. The flame velocity is determined by the gas composition, the temperature of the gas-air mixture, and the availability of primary and secondary air. When the flame velocity is sufficiently high relative to the outflow velocity, the flame length will be short, with the gas-air mixture burning near the flame port. When a large amount of gas is supplied, the outflow velocity increases, thus increasing the flame length. Due to the relatively high proportion of gas in the gas-air mixture, the flame velocity also decreases, further increasing the flame length. With further increases in gas supply, there is a risk that the flame will be blown away from the burner, cooling and extinguishing. In this case, the flame velocity is too low relative to the outflow velocity. Heat transfer can be optimized by adjusting the flame length to the distance from the heated surface.

[0004] Secondary combustion of residual gases occurs in a zone outside the primary combustion zone relative to the flame port. In this case, the necessary secondary air inflow is limited by the distance between the flame port and the heated surface (e.g., the bottom of a pan). Known burners are quite sensitive to this. If the secondary air inflow is insufficient to ensure complete combustion of the gas-air mixture, unwanted residual gases may even escape.

[0005] Because the inflow of secondary air must be sufficient to achieve complete secondary combustion, a relatively large distance is chosen between the gas burner and the heating surface in existing gas burners. Due to this relatively large distance, the heat transfer from the flame to the heating surface is suboptimal. These disadvantages are particularly evident when the concentric rings of the flame ports are located in a common plane, where, in particular, the inner flame ports may have insufficient secondary air supply to ensure optimal heat transfer to the bottom of the pan.

[0006] To achieve stable combustion under varying gas supply conditions, flame stabilization is employed in prior art gas burners, where hot combustion gases are returned to the flame port, for example, via a baffle, thereby increasing the temperature of the outflowing gas-air mixture. This increases the flame velocity and enables combustion near the flame port within a defined gas supply range. However, in prior art gas burners, the heat required for flame stabilization leads to undesirable heating of the burner housing and is detrimental to the burner's efficiency. Summary of the Invention

[0007] The object of the present invention is particularly to provide an apparatus in which one or more of these disadvantages are eliminated.

[0008] To achieve the intended purpose, the gas burner of the type described in the preamble has the features of the invention, namely, that the inlet device includes at least one auxiliary gas port that enters into or leads to the wall of the inlet device in or near the path of ambient air, the at least one auxiliary gas port being connected to an auxiliary gas device that is capable of and configured to generate a forced auxiliary gas flow and maintain the forced auxiliary gas flow together with the gas flow, and the at least one auxiliary gas port supplying the auxiliary gas flow through the wall of the inlet device.

[0009] A specific embodiment of the gas burner is characterized herein by the gas inlet comprising an air inlet that allows ambient air to flow into the gas stream, the at least one auxiliary gas port being accessible to or through a channel wall of a fuel passage, and the at least one auxiliary gas port being capable of and configured to deliver auxiliary gas through the channel wall of the fuel passage to an outlet during operation.

[0010] The fuel flow supplied from the gas supply device to the gas inlet carries a primary ambient air flow, which is thus drawn into the inlet device. This invention is based on the understanding that the downstream flow of the auxiliary gas through the wall of the fuel passage creates a negative pressure upstream, thus enhancing this suction and increasing the inflow of ambient air. This provides a gas-air mixture with a higher proportion of primary air, whereby combustion at the flame port occurs at a higher flame velocity, and therefore closer to the flame port, where the demand for secondary air is lower. The higher flame velocity further reduces the chance of the flame being blown away and eventually extinguished. This reduces or eliminates the need for flame stabilization.

[0011] Because combustion is more complete, unwanted leakage of combustion gases can be limited to a minimum, or even zero. Since combustion of the gas-air mixture occurs near the flame port and requires less secondary air, a shorter distance to the heating surface (e.g., the bottom of a pan) can be selected, resulting in more optimized heat transfer between the flame and this surface. Therefore, the improved heat transfer not only leads to higher efficiency, but also allows the gas burner according to the invention to meet more stringent environmental requirements due to improved combustion and reduced demand for secondary air.

[0012] It is suspected that the auxiliary gas flow along the wall of the inlet device toward the outlet generates a drag effect upstream, thereby exerting a suction effect on the primary ambient air. This effect is further enhanced in a preferred embodiment of the gas burner according to the invention, characterized in that a coanda surface is disposed adjacent to at least one auxiliary gas port, through which the auxiliary gas flow is received.

[0013] In the context of this application, Coanda surface ( The term "surface" is understood to mean at least a surface that curves transversely to the flow direction and has a sufficiently low but significant radius for a given auxiliary gas flow velocity to allow the auxiliary gas flow to adhere to it and follow the curvature. Preferably, a step or shoulder in the auxiliary gas flow is present prior to this curvature. This pushes the auxiliary gas flow in the outer bend to a higher velocity, thereby creating a negative pressure, which in the gas burner according to this embodiment is the cause of the additional suction effect on the primary ambient air. The Coanda effect and its surface definition are further described in a paper by Imants Reba in Scientific American, Vol. 214, June 1966, pp. 84-92, the contents of which are to be considered as cited and incorporated herein.

[0014] Another specific embodiment of the gas burner according to the invention is characterized in that the auxiliary gas port is intended and configured to supply an auxiliary gas flow at an increased rate, at least the same rate as or higher than the rate of the fuel / air mixture, at least during operation. Supplying auxiliary gas to the walls of the fuel passage at an increased rate enhances the suction effect on ambient air or primary air at the gas inlet.

[0015] An embodiment of the gas burner according to the invention is characterized in that the inlet device includes an auxiliary gas port located downstream of the gas inlet. In that case, the supply of gaseous fuel and primary ambient air on one side and the supply of the auxiliary gas flow on the other side are independent and separate.

[0016] An embodiment of the gas burner according to the present invention is characterized in that the auxiliary gas port of the fuel passage is located in the wall of the fuel passage.

[0017] An embodiment of the gas burner according to the invention is characterized in that the auxiliary gas port includes an inlet gap that opens into the fuel passage and extends over at least a portion of the periphery of the wall of the fuel passage, particularly extending coaxially over at least substantially the entire periphery of the wall of the fuel passage.

[0018] An embodiment of the gas burner according to the invention is characterized in that the fuel passage gradually widens downstream of the auxiliary gas port. This widening causes the auxiliary gas flowing through the wall of the fuel passage to expand towards the outlet.

[0019] An embodiment of the gas burner according to the invention is characterized in that the auxiliary gas port includes an auxiliary combustion gas passage defined by a first wall having a curved surface toward the fuel passage. This creates a Coanda effect on the auxiliary gas flowing along the wall of the fuel passage, which flows out during operation.

[0020] An embodiment of the gas burner according to the invention is characterized in that an auxiliary gas passage is defined by a second wall having a surface extending substantially parallel to a first wall of the auxiliary gas passage. This enhances the Coanda effect of the first wall of the auxiliary gas passage, whose curved surface faces the fuel passage.

[0021] An embodiment of the gas burner according to the invention is characterized in that an auxiliary combustion gas passage can be coupled to an auxiliary gas device, which includes a gas moving device. This provides a supply of auxiliary gas. The gas moving device can initiate forced flow of the auxiliary gas and / or place the auxiliary gas under pressure. An embodiment of the gas burner according to the invention is characterized in that the gas moving device includes at least one of a fan, a propeller, an impeller, and a compressor, particularly including a fan or a compressor.

[0022] An embodiment of the gas burner according to the invention is characterized in that the inlet device includes a venturi device. The venturi device can be housed in the fuel passage and provides improved suction of ambient air when a gas flow is injected into the gas inlet of the inlet device during operation.

[0023] An embodiment of the gas burner according to the invention is characterized in that the auxiliary gas comprises ambient air. Thus, the auxiliary gas helps to provide the necessary primary air for the gas burner. Furthermore, no separate gas supply device is required to supply ambient air, nor is it necessary to supply a specific gas.

[0024] The object of the present invention is also achieved in household appliances, particularly cooking appliances, characterized in that at least one gas burner according to the invention as described above is provided in the household appliance. The increased output of the gas burner and the reduced dependence on secondary air enable a wider variety of burner heads to be located on the burner housing to accommodate the flame port, such as flat burner heads and burner heads that can follow the bottom profile of a pan (e.g., the curved bottom profile of a frying pan).

[0025] A specific embodiment of the household appliance according to the invention is characterized in that the appliance includes at least a first gas burner and a second gas burner according to the invention, the first and second gas burners including corresponding auxiliary gas ports, and the corresponding auxiliary gas ports of the first and second gas burners being connected to a common auxiliary gas device, the common auxiliary gas device including a gas movement device. By thus selecting an auxiliary gas device for at least two gas burners in common, significant cost savings and simpler production of the cooking appliance can be achieved. Attached Figure Description

[0026] The invention will be further described below with reference to exemplary embodiments and accompanying drawings. In the drawings:

[0027] Figure 1 A schematic side view of an exemplary embodiment of a gas burner according to the prior art is shown;

[0028] Figure 2 A schematic side view of a first exemplary embodiment of a gas burner according to the present invention is shown;

[0029] Figure 3 A schematic side view of a second exemplary embodiment of a gas burner according to the present invention is shown;

[0030] Figure 4 A schematic side view of a third exemplary embodiment of a gas burner according to the present invention is shown;

[0031] Figure 5 A schematic side view of a fourth exemplary embodiment of a gas burner according to the present invention is shown;

[0032] Figure 6 A schematic top view of an exemplary embodiment of a gas burner assembly according to the present invention is shown. Detailed Implementation

[0033] It should also be noted that these figures are purely schematic and not always drawn to scale. For clarity, certain dimensions may be exaggerated to some extent. Corresponding parts are indicated in the figures with the same reference numerals.

[0034] Figure 1 A gas burner 100 according to the prior art is shown, which has an optional controlled gas supply device 101 for injecting a gas flow 102, or at least a gaseous fuel flow, into a gas inlet 104 at an inlet 117 of an inlet device 107. Downstream of the gas inlet 104, the inlet device includes a fuel passage 108, which is laterally defined within the inlet device 107 by a passage wall 105. The fuel passage 108 connects the inlet 117 to an outlet 116 of the inlet device.

[0035] like Figure 1 As shown, the gas inlet 104 narrows in the downstream direction, i.e., towards the fuel passage 108. The narrowed outer end of the gas inlet 104 thus forms a contraction at the transition to the fuel passage 108, which subsequently widens. Due to this contraction and subsequent widening, a Venturi effect is achieved when the gas flow 102 is injected from the gas supply device 101 into the inlet 117 of the gas inlet 104. This Venturi effect generates a negative pressure in the gas inlet 104, thereby drawing ambient air into the inlet device 107.

[0036] Due to this Venturi effect, the rapidly flowing gas stream 102 entrains a portion of ambient air 103, also known as primary air, thereby conveying the gas-air mixture 106 through the fuel passage 108 to the outlet 116 of the inlet device 107. The outlet 116 is connected to the burner housing 110 of the gas burner 100. The gas-air mixture 106 is thus conveyed through the outlet 116 of the inlet device into the hollow burner chamber 111 of the burner housing 110, where further homogenization of the gas-air mixture occurs.

[0037] The burner housing 110 includes a set of flame ports 113 at the location of the burner chamber 111, from which a gas-air mixture can escape from the burner chamber 111. Outside the flame ports 113, the gas-air mixture can burn after ignition to form a flame 114. The portion of the burner housing 110 with the flame ports 113 is also referred to as the burner head. Figure 1 In this design, the burner head 112 is shown on the upper side of the burner housing 110, above the burner chamber 111, and has a flame port 113 therein. The burner head 112 can be positioned above the burner chamber 111 to be removed from the burner housing 110, or it can be integral with the burner housing.

[0038] The gas-air mixture flowing into the burner chamber 111, consisting of a gas stream 106, has a substoichiometric composition, meaning that the gas-air mixture has a limited excess of gas 102 relative to the primary air 103. Partly due to the forced outflow velocity of the gas-air mixture through the flame port 113, the gas-air mixture is thus not ignited until outside the flame port 113. The previously supplied primary air 103 in the gas-air mixture now provides initial incomplete primary combustion in a first zone outside the flame port 113. The residual gases from the primary combustion further undergo secondary combustion in a second zone, while being supplied with secondary air 115. This second zone is further from the flame port than the first zone where primary combustion occurs. Due to this influx of secondary ambient air 115, the secondary combustion of the residual gases in the second zone is complete.

[0039] Figure 2 A gas burner 200 according to an exemplary embodiment of the present invention is shown. A gas burner in the form of a burner housing 110 is also used herein, the burner housing being coupled with an inlet device 107 that supplies a gas-air mixture to the burner housing, primarily as shown in the references. Figure 1 The gas burner described. However, Figure 2The device shown includes an auxiliary gas port 202 in the inlet device 107, which opens toward the wall 105 of the fuel passage 108. The auxiliary gas port 202 is connected to an auxiliary gas device 203, which generates and maintains a forced gas flow 209 during operation. This auxiliary gas flow 209 flows through the auxiliary gas port 202 and across the wall 105 of the fuel passage 108.

[0040] The auxiliary gas port 202 is formed here by a coaxial gap that extends along the periphery of the wall 105 of the fuel passage 108 and communicates openly with the air chamber 208 upstream. The fuel passage 108 is thus divided into two parts: a first portion 105a upstream of the auxiliary gas port 202, and a second portion 105b downstream of the auxiliary gas port 202, viewed along the flow direction of the gas 106 in the fuel passage 108. Upstream of the auxiliary gas port 202, the passage wall 105 is double-walled and therefore includes a cavity 201 serving as a supply channel for the auxiliary gas. Through the supply channel 201, the auxiliary gas 205 is supplied by the auxiliary gas device 203 and pushed to the auxiliary gas port 202. The flush orientation of the auxiliary gas port 202 ensures that this forced auxiliary gas flow 209 is supplied along the wall 105 of the fuel passage 108 in a direction toward the outlet 116.

[0041] This auxiliary gas flow 209 adheres to the wall 105 and creates a drag effect, resulting in an increased negative pressure, i.e., a lower pressure, in the upstream portion 105a of the channel 108. This, in turn, increases the suction of the primary ambient air 103 at the inlet 117 of the inlet device, thereby enhancing the inflow of primary ambient air 103. The subsequently enriched gas-air mixture 206 remains substoichiometric, but thus obtains a higher ambient air content than without the auxiliary gas flow 209. Therefore, combustion in the flame 114 outside the flame port 113 becomes less dependent on the secondary ambient air 115. Furthermore, due to the increased overall gas flow 206 of the gas-air mixture, the outflow velocity in the flame port 113 becomes higher. Combined with the higher flame velocity, this results in a combined effect that prevents the flame from being blown away.

[0042] Any gas is suitable for the auxiliary gas flow 209, thereby increasing the negative pressure in inlet 104. However, ambient air is also preferably used for this purpose, as it is readily available from the surrounding area and further contributes to the air content in the gas-air mixture. For this purpose, the auxiliary gas device 203 includes a gas movement device 204, such as a fan, propeller, impeller, or compressor, which forcibly draws ambient air 205 from the surrounding area and supplies it to the auxiliary gas port 202. The power source for the gas movement device can be electrical, such as a motor powered by a battery or local power grid, but the gas flow 102 can also be used to drive a propeller or impeller, which is directly coupled to the gas movement device, for example, via a common rotating shaft or transmission, or to drive a generator that powers the battery of the gas movement device.

[0043] The following will combine Figure 3 , Figure 4 and Figure 5 Further illustrative alternative embodiments of the gas burner according to the present invention are explained. The associated auxiliary gas port is always connected to the gas moving device of the auxiliary gas apparatus in the same manner, such that the auxiliary gas port supplies a forced auxiliary gas flow of ambient air. Figure 2 The same applies to [the other side]. However, for the sake of clarity in the accompanying drawings, these auxiliary gas devices are not shown [in the diagram]. Figure 3 , Figure 4 and Figure 5 This is further illustrated in the text.

[0044] Figure 3 A gas burner 300 according to a second embodiment of the invention is shown. This structure is substantially the same as that of the first example and includes an auxiliary gas supply passage 301, in which case the auxiliary gas is also ambient air, flowing into an auxiliary gas port 302 near the inner wall 105 of the inlet device 107. Adjacent to the auxiliary gas port 302, the inner wall 105 includes a curvature 307 that provides a coanda surface thereon over which the forced auxiliary gas flow 309 exits the auxiliary gas port 302. This curved surface then smoothly transitions into the inner wall 105 of the fuel passage 108.

[0045] A convex, curved Coanda surface 307 connected to the auxiliary gas port 302 produces a so-called Coanda effect on the auxiliary gas 309 flowing out of the auxiliary gas port 302. The auxiliary gas flow 309 "attaches" to this surface 307, causing the auxiliary gas flow 302 to follow the curvature of the surface. The radius of the curved surface here pushes the outflowing gas to a greater velocity, resulting in a pressure drop at the location of the curvature 307. This pressure drop provides an increased suction effect on the primary ambient air 103, thereby further increasing the proportion of ambient air in the gas flow 206. The radius of the curved surface and the size and location of the auxiliary gas port are selected according to the intensity of the auxiliary gas flow to optimize this effect. For a more detailed investigation of this Coanda effect, see a paper by Imants Reba in Scientific American, Vol. 214, June 1966, pp. 84–92.

[0046] Figure 4 It shows Figure 3 A variant of the gas burner, wherein the auxiliary gas port 402 is connected not only to a wall portion 407 of the inlet device 107 with a curved Coanda surface, but also to a counterwall 403 whose curvature substantially follows that of the Coanda wall 407. Thus, a curved auxiliary combustion channel is formed between the two wall portions 403, 407, giving the auxiliary gas flow curvature. The auxiliary gas flow 409 from the auxiliary gas port 402 is now diverted and transported to the Coanda surface not only by the Coanda effect of the adjacent wall portions 407 but also by the curvature of the counterwall 403.

[0047] Figure 5 Showing Figure 2 gas burners and Figure 4 The gas burner is a hybrid configuration in which an auxiliary gas port 502 extends into the wall 105 of the fuel passage 108 further downstream of the gas inlet 104. As in the previous example, the auxiliary gas port includes a coaxial gap extending around the entire periphery of the passage 108 and supplied with a forced auxiliary gas flow of ambient air via a supply passage 501 provided for this purpose by an auxiliary gas device. In this example, the auxiliary gas port 502 opens toward the flat wall 105 of the fuel passage 108, but upstream has a coanda surface 507 provided by the curved auxiliary combustion gas passage 501 between the first wall 503 and the second wall 507, both of which have… Figure 4 The bending and extension in the middle.

[0048] Figure 6 A gas burner assembly is schematically shown, wherein, according to Figure 5The two inlet devices 107A and 107B are equipped with a common auxiliary gas device 701..705 for supplying a forced flow of ambient air as an auxiliary gas. It will be apparent to those skilled in the art that... Figure 6 Examples are not limited to those based on Figure 5 The inlet devices 107A and 107B are not applicable to, but can be used as... Figure 2 , Figure 3 and Figure 4 The other exemplary embodiments of the entry device are shown. For clarity, Figure 6 The corresponding burner housing 110 is omitted.

[0049] Two inlet devices 107A and 107B are openly connected to shared gas chambers 701 and 705 via their auxiliary gas inlets 601, thus eliminating any pressure difference between them. The two gas burners are supplied with equally distributed forced auxiliary gas flows 602 via a shared auxiliary gas device 701 having an air movement device 702 that draws in ambient air 703. For this purpose, the shared air movement device 702 includes, for example, a fan, propeller, impeller, or compressor, whereby ambient air is drawn in. Due to their complex structure, at least several parts of the air chamber 704, auxiliary gas port 601, and inlet device 107 of the respective gas burners can be housed within a shared housing 701, which can be formed wholly or partially from plastic or metal, for example using 3D additive manufacturing technology.

[0050] Household appliances, particularly cooking appliances, according to the invention include a housing, for example from... Figures 2 to 5 One or more gas burners that are obvious, or according to Figure 6 The gas burner assembly is housed within the housing. The gas burner or gas burner assembly is mounted, for example, in a predetermined position within the housing using a support. The burner housing with the flame port of each gas burner is positioned on the free upper side of the housing, allowing the bottom of the pan to be placed above the flame port while being supplied with secondary ambient air.

[0051] The housing is provided with a connector for a gas supply device 101 for the gas inlet 102, which can be connected, for example, to a household connector via a gas hose. However, the appliance may also consist of a separate gas cylinder, in which case the gas cylinder can be connected to a gas connector. The gas supply device may be provided with a gas controller for controlling the gas supply. The housing also provides an ambient air supply opening, which can be drawn in by the gas burner as primary air and also used to supply auxiliary gas to the auxiliary gas device. At least one gas burner inlet device is provided with an auxiliary gas port and auxiliary gas supply device as described above, housed within the housing, to allow at least one gas burner or gas burner assembly to operate according to the invention.

[0052] While the invention has been further illustrated above with reference to only a single exemplary embodiment, it is clear that the invention is by no means limited thereto. Rather, many variations and embodiments are still possible within the scope of the invention for those skilled in the art. Thus, the exit angle of the flame port and the associated gas-air mixture is shown in the figures as lateral, thereby oriented the flame partially horizontally. However, other exit angles, such as diagonal or vertical, may be conceived by those skilled in the art.

[0053] In the diagram, the walls of the fuel passage are depicted as gradually widening towards the outlet. These walls can also extend towards the outlet without widening. Furthermore, these walls can be curved or spiraled to allow for integration into cooking appliances.

[0054] The auxiliary gas port is described above as a gap in the wall of the inlet device or toward the wall of the inlet device. In an alternative embodiment, the auxiliary gas port may also be formed by a plurality of gaps or openings disposed in the wall above the periphery, which may interconnect with a common supply channel for the auxiliary gas.

Claims

1. A domestic gas burner for a cooking appliance, the gas burner comprising a burner housing having a burner chamber and comprising an inlet arrangement, the burner housing comprising one or more flame ports capable of igniting a gas flame, the inlet arrangement having a gas inlet configured to admit a gas flow of a gaseous fuel and an outlet capable of causing a mixture of fuel and air to be received, wherein, The gas inlet and outlet of the inlet device are in open communication with each other through a fuel passage defined by a passage wall, wherein the burner chamber is connectable to an optionally controlled gas supply device through the inlet device, the inlet device comprising at least one air inlet allowing ambient air to freely enter the gas stream, characterized in that the inlet device comprises at least one auxiliary gas port, the auxiliary gas port passing through the passage wall of the fuel passage downstream of and adjacent to the gas inlet and the air inlet into the path of the ambient air, the at least one auxiliary gas port being connected to an auxiliary gas device configured to generate a forced auxiliary gas stream and to maintain the forced auxiliary gas stream together with the gas stream, and the at least one auxiliary gas port feeding the auxiliary gas stream through the passage wall of the fuel passage, the auxiliary gas stream being received over a Coanda surface provided adjacent to the at least one auxiliary gas port.

2. The gas burner according to claim 1, characterized in that The auxiliary gas port is configured to feed the auxiliary gas stream at least during operation at a speed that is the same as or higher than the speed of the mixture of fuel and air.

3. Gas burner according to claim 1 or 2, characterized in that The fuel passage comprises the auxiliary gas port downstream of the gas inlet.

4. The gas burner according to claim 1 or 2, characterized in that The fuel passage comprises the auxiliary gas port on a wall of the fuel passage.

5. The gas burner according to claim 1 or 2, characterized in that The auxiliary gas port comprises an inlet gap opening into the fuel passage and extending over at least a portion of the periphery of the wall of the fuel passage.

6. The gas burner of claim 5, wherein The inlet gap extends coaxially over substantially the entire periphery of the wall of the fuel passage.

7. The gas burner according to claim 1 or 2, characterized in that The fuel passage widens gradually downstream of the auxiliary gas port.

8. The gas burner according to claim 1 or 2, characterized in that The auxiliary gas port comprises an auxiliary gas passage defined by a first wall, the first wall having a curved surface facing the auxiliary gas passage.

9. The gas burner of claim 8, wherein, The auxiliary gas passage is defined by a second wall, the second wall having a surface extending substantially parallel to the first wall of the auxiliary gas passage.

10. The gas burner according to claim 1 or 2, characterized in that The auxiliary gas device comprises a gas moving device.

11. The gas burner of claim 10, wherein The gas moving device comprises at least one of a fan, a propeller, an impeller and a compressor.

12. The gas burner of claim 1 or 2, wherein The inlet device comprises a venturi device.

13. The gas burner of claim 1 or 2, wherein The auxiliary gas comprises ambient air.

14. A cooking apparatus, characterized by, The cooking device is provided with at least one gas burner according to any one of claims 1 to 13.

15. The cooking apparatus of claim 14, comprising a first gas burner and a second gas burner, characterized in that, The first and second gas burners are both gas burners according to any one of claims 1 to 13, the first and second gas burners comprising respective auxiliary gas ports, and the respective auxiliary gas ports of the first and second gas burners being connected to a common auxiliary gas device, the auxiliary gas device comprising a gas moving device.

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