ES2717549A1 - INJECTOR DEVICE FOR A GAS BURNER OF A DOMESTIC APPLIANCE, GAS BURNER, AND DOMESTIC APPLIANCES (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

The invention relates to an injector device (3) for a gas burner (2) of a domestic appliance (1), where the injector device (3) has a section of duct (20) through which gas flows (12) during operation of the gas burner (2), and a wall section (21) delimiting the conduit section (20). The wall section (21) has at least two openings (22) through which the gas leaves the injector device (3) during operation of the gas burner (2). The at least two openings (22) are configured to divide a single stream of gas flowing through the conduit section (20) during operation of the gas burner (2) into separate gas streams (23). Also, the invention relates to a gas burner (2) with an injector device (3) of this type and a household appliance (1) with at least one gas burner (2). (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

INJECTOR DEVICE FOR A GAS BURNER OF A

HOUSEHOLD APPLIANCE, GAS BURNER, AND APPLIANCE

DOMESTIC

The present invention relates to an injector device for a gas burner of a household appliance. The injector device has a section of conduit through which gas flows during operation of the gas burner. A wall section delimits the conduit section. The wall section has an opening through which the gas leaves the injector device during operation of the gas burner. Also, the invention relates to a gas burner with an injector device of this type and to a domestic appliance with at least one gas burner.

It is difficult to design gas burners for household appliances such as gas hobs, gas stoves, or gas ovens, so that the gas that comes out of an injector device or injector nozzle is mixed with a sufficient amount of primary air, that is, with air that is present around the gas stream leaving the injector device. This primary air is drawn or carried along with the gas stream leaving the injector device, so that a mixture of primary air and gas or fuel is obtained. It is also difficult to obtain a mixture of primary air and gas that has sufficient homogeneity. This is particularly true if the mixture of gas or fuel and primary air is obtained in confined or limited spaces, for example, under a top plate of the household appliance.

This is a very common problem for gas burners that are equipped with injectors with a high power flow rate such as wok burners. The reduced or limited space mainly restricts the dimensions of mixing elements such as a Venturi tube located downstream of the injector and a mixing manifold through which the gas and primary air mixture flows before the mixture is ignited. As a consequence, the limited amount of primary air that is entrained by the gas stream leaving the injector and the poor homogeneity of the mixture adversely affect the performance of the burner. Consequences may include, for example, a non-uniform flame or a large yellow-tipped flame as a result of lack of oxygen when the gas is burned. In addition, stability problems can occur as a consequence.

WO 2005/073630 A1 discloses a gas burner suitable for use with a wok. Here, a distributor of the gas burner has multiple injection nozzles which are arranged at the same distance from each other on the inner periphery of a distributor housing element.

This requires a lot of space and makes the design of the gas burner quite complex.

Therefore, the present invention solves the technical problem of providing an injector device of the type mentioned at the beginning that improves the mixing of the gas leaving the injector device with air, as well as providing a gas burner with an injector device of this type and a household appliance with a gas burner of this type.

This technical problem is solved by the object of the independent claims. In the dependent claims, advantageous configurations are specified with other convenient developments of the invention.

The injector device according to the invention for a gas burner of a household appliance has a section of duct through which gas flows during operation of the gas burner. The injector device further has a wall section delimiting the conduit section. The wall section has at least two openings through which the gas leaves the injector device during operation of the gas burner. The at least two openings are configured to divide a single stream of gas flowing through the conduit section during operation of the gas burner into separate gas streams. Since the mass of the gas stream flowing through the conduit section is divided into separate partial gas streams or gas jets, each of the gas streams entrains air from the respective surroundings of the gas stream. partial. Accordingly, a particularly high amount of air is entrained by the gas streams leaving the injector device. As a result, more air can be mixed with the gas within a limited space. Therefore, the mixture of the gas leaving the injector device with the air surrounding the gas streams is improved.

In particular, a greater input of primary air is achieved, since a particularly large amount of air is entrained by the separated gas streams. Even in small or small spaces compared, the mixture containing the gas and the primary air is very homogeneous. Since the mixture is more homogeneous, combustion is improved. In particular, the homogeneity of the mixture is improved before leaving the burner body or a gas burner mix distributor. This also entails the reduction of greenhouse gas emissions. Finally, it is possible to implement a wide variety of designs of gas burners to be said design less conditioned by spatial requirements.

Preferably, the at least two openings are configured in such a way that the separated gas streams draw more of the air surrounding the gas streams than a single stream of gas with the same flow rate as the at least two streams of gas. gas together. Expressed differently, the division of the single gas stream flowing through the conduit section into the plurality of gas streams or gas jets with the same fluidic properties and velocity magnitudes will bring with it gas streams with a reduced gas flow rate of each of the separated gas streams. As a consequence of the reduced amounts of gas flow from each gas stream or gas stream, the gas streams will be thinner, and their velocities will be reduced as the gas mixes with the air surrounding the gas stream. individual. Each stream or jet of gas carries the surrounding fluid stagnant in the form of (primary) air surrounding the gas streams. This increases the overall or total air drag capacity of the injector device during operation of the gas burner. Thus, the advantages mentioned above are achieved to a greater extent.

Preferably, the wall section is configured as a top plate of the injector device. Accordingly, the single gas stream flowing through the conduit section can be divided particularly well in the separated gas streams.

Preferably, the duct section comprises an inlet section provided by a tube element of the injector device and a final section provided by a second element, in particular by means of a hat-shaped element, connected to the tube element in a manner separable. This makes it possible for the injector device to be configured or equipped with a second specific element with the desired amount, shape and distribution of openings or perforations of the wall section. Therefore, the amount, shape, and distribution of the openings leading to the formation of the separated gas streams can be easily adapted to the specific limit conditions of the gas burner.

By way of example, the cross-sectional area of the openings and / or the number of openings and / or the shape of the openings and / or the distribution of the openings in the wall section can be adapted to the specific conditions of the gas burner in order to achieve optimal results with respect to air entrainment and gas mixing with the air or primary air. In order to achieve this, it is sufficient to separate the second element, specifically, the hat-shaped element, and replace the second element with another second element, namely, a hat-shaped element, having adapted openings.

Preferably, the hat-shaped element has a flange section that abuts on an end face of the tube element. Thus, a very regular transition is provided between the inlet section and the end section, which facilitates the flow of the single gas stream through the conduit section. In addition, this facilitates the assembly of the hat-shaped element on the tube element.

Preferably, the hat-shaped element is detachably attached to the tube element by a fastening element. Therefore, a very tight connection between the hat-shaped element and the tube element is achieved.

The fastening element may have an internal thread that is engaged with an external thread provided on the outer surface of the tube element. In such a configuration, screwing the clamping element onto the tube element securely fixes the hat-shaped element to the tube element. Therefore, the hat-shaped element can also be easily detached by unscrewing the fastening element from the tube element.

The two openings can have the same shapes or different shapes. In a very simple configuration, the openings can have a round shape. Alternatively or additionally, the shape of the openings can be rectangular and / or square and / or triangular. Also, the at least two openings may have a star shape. This shape makes the contact area between the gas stream or fuel jet and the surrounding air quite large. This also applies to other polygonal shapes of the openings.

In addition, a double cone shape of the openings causes a particularly high amount of surrounding air to be entrained and, therefore, improves the mixing of the gas with the air. Also, the openings or perforations may have an arched shape. The dimensions and / or the shape and / or the number of holes or openings of the wall section can be easily adapted to the requirements, in particular, to the spatial requirements, of the gas burner to be equipped with the device. injector.

The gas burner according to the invention has at least one injector device according to the invention. The at least one injector device is preferably disposed downstream of a Venturi device of the gas burner. The Venturi device is configured to draw the primary air from the surroundings of the injector device to a mixing zone of the gas burner. From this mixing zone, the gas mixture with the air can leave a mixture distributor of the gas burner to the surroundings of the mixing distributor. Here, the mixture is mixed with another secondary air, and the mixture is ignited. In a gas burner of this type, the mixture of the gas leaving the injector device with primary air is improved.

The domestic appliance according to the invention has at least one gas burner according to the invention. Preferably, the at least one injector device is disposed below an upper plate of the domestic appliance. The domestic appliance can be a gas cooker, a gas hob, or a gas oven. The gas burner can be configured as a wok burner.

The advantages and preferred embodiments described with respect to the injector device according to the invention are also applicable to the gas burner according to the invention and to the household appliance according to the invention, and vice versa.

The features and combinations of features mentioned above in the description, as well as the characteristics and combinations of features mentioned below in the description of the figures and / or shown alone in the figures are usable not only in the combination indicated in each case, but also in other combinations or separately, without leaving the scope of the invention. Therefore, it should be understood that those embodiments of the invention that are not explicitly shown in the figures and are not explained, but that can be extracted through combinations of features separated from the forms, are also understood and disclosed by the invention. of realization exposed, and that can be generated from these. Accordingly, those embodiments and combinations of characteristics that do not have all the characteristics of an independent claim originally formulated will also be considered disclosed. Likewise, those forms of embodiment and combinations of characteristics that transcend or that differ from the combinations of characteristics set forth in references to the claims will be considered disclosed by means of the embodiments set forth above.

Other advantages, features and details of the invention can be derived from the claims, the following description of the preferred embodiments, as well as based on the drawings, in which the elements with analogous functions are accompanied by the same reference symbols. Here, they show:

Fig. 1 schematically, a partial sectional view of a domestic appliance configured as a gas cooker, where a gas burner of the gas cooker has an injector device or injection nozzle with multiple holes or openings in an upper plate of the injection nozzle ;

Fig. 2 schematically, an enlarged view of gas streams or separate gas jets emerging from the injector nozzle, where the gas streams entrain the air surrounding the gas streams to a Venturi tube of the gas burner;

Fig. 3 a perspective sectional view of an example of the injection nozzle;

Fig. 4 a sectional view of the injection nozzle shown in figure 3;

Fig. 5 a top view of the injector nozzle with a possible shape of the openings or holes provided in the upper plate of the injector nozzle;

Fig. 6 a top view of the injector nozzle with another possible shape of the openings or holes provided in the upper plate of the injector nozzle;

Fig. 7 a top view of the injector nozzle with another possible shape of the openings or holes provided in the upper plate of the injector nozzle;

Fig. 8 a top view of the injector nozzle with another possible shape of the openings or holes provided in the upper plate of the injector nozzle;

Fig. 9 a top view of the injector nozzle with another possible shape of the openings or holes provided in the upper plate of the injector nozzle; Y

Fig. 10 schematically, the gas cooker according to figure 1, which has multiple gas burners.

The indications "upper", "lower", "upper part", "front part", "lower part", "floor", "horizontal", "vertical", "direction of depth", "direction of width" , "height direction", and the like, refer to the positions and orientations of the device or apparatus in its intended position of use with respect to an observer located in front of the device and which is observing towards the device or apparatus.

Figure 1 schematically shows a sectional view of an upper part of a domestic appliance configured as gas cooker 1, which is also shown in the figure 10. The gas cooker 1 has multiple gas burners 2, which are also indicated schematically in Figure 10.

As can be seen in figure 1, the gas burner 2, which is partially shown in the section view of figure 1, comprises an injector device or injection nozzle 3, which is arranged under an upper plate or plate upper 4 of the gas cooker 1. The upper cooktop 4 can be a metal plate. In a variant, the upper plate 4 can be made of glass. On the upper part of the upper plate 4 there are supports 5 (see FIG. 10) for supporting a pan or pot 6, such that the base 7 of the pot 6 is disposed at a certain height 8 above the upper plate 4. and on top of the gas burner 2.

An injector holder 9 supports the injector nozzle 3 and has air inlets 10 which allow the primary air 11 to mix with the gas 12 leaving the injector nozzle 3 during the operation of the gas burner 2. The primary air 11 appears illustrated by curved arrows in figure 1, and the gas 12 flowing through the injector nozzle 3 is illustrated by straight arrows in figure 1. When the gas 12 leaves the injector nozzle 3, it draws primary air 11 into a tube of venturi 13 of the gas burner 2. The primary air 11 enters the venturi pipe 13 through the air inlets 10.

The venturi tube 13 is provided by a base part 14 of a mixing distributor 15 of the gas burner 2. The mixing distributor 15 also comprises a cover 16 located on the upper part of the base part 14. In a manner known as such , the lid 16 has multiple outlets along its periphery, such that the mixture of the primary air 11 and the gas 12 leaves the mixing distributor 15 in the radial direction during the operation of the gas burner 2. The flow of the mixing towards these outputs is indicated by more arrows 17 in figure 1.

When the mixture of the primary air 11 and the gas 12 leaves the mixture distributor 15, the mixture is mixed again with secondary air 18, which is illustrated in FIG. 1 by other arrows. The combustion of the mixture takes place when the mixture leaves the mixture distributor 15, when the mixture is mixed again with the secondary air 18. For this reason, in FIG. 1, a flame 19 is shown schematically, which draws the secondary air 18. .

The fuel or gas 12 needs an exact (stoichiometric) amount of air to be completely burned. In order to achieve this, the gas 12 is premixed first with the primary air 11. The primary air entrainment is caused by the jets of fuel or gas streams 23 (see Figure 2) in the area surrounding the fuel transfer nozzle 3 and the venturi pipe 13.

However, it is difficult to obtain a sufficient amount of primary air 11 and sufficient homogeneity in the mixture of primary air 11 and gas 12 or fuel in the area of the Venturi pipe 13. This is mainly due to the limited space available under the plate. 4. This can negatively affect the performance of the gas burner 2 with the result that the flames 19 present around the mixture distributor 15 or the burner body may not be uniform, have the yellow tip, and be unstable. These problems are avoided by using the injection nozzle 3 shown in Figure 1, which is described in more detail below.

As can best be seen in Figure 2, the injection nozzle 3 has a section of conduit 20 through which the gas 12 flows during the operation of the gas burner 2. A wall section which is configured as an upper plate 21 of the injection nozzle 3 has at least two openings 22, as can be clearly seen also in figure 3. The gas 12 flowing through the conduit section 20 during the operation of the gas burner 2 is indicated by arrows lines in Figures 2 and 3. The openings 22 or holes are configured to divide a single gas stream flowing through the conduit section 20 into separate gas streams 23 that exit the injector nozzle 3 through the openings 22

In the schematic illustration of figure 2, the injector nozzle 3 with two openings 22 or holes is shown. However, the injection nozzle 3 can have as many holes or openings 22 as it is considered necessary for a specific gas burner 2 or for the specific power or flow level of the gas 12 that is supplied to the injector nozzle 3 of the gas burner 2 By way of example, depending on the type of gas 12 supplied to the injector nozzle 3, that is, depending on the type of gas 12 used, different flow rates and / or different pressures may exist. For example, methane is supplied in Europe at a pressure of 20 mbar, and butane can be supplied at 29 mbar or 50 mbar depending on the country. The injector nozzle 3 is configured to work with these types of pressures and these types of fuels or gases 12.

However, the arrangement and / or quantity and / or shape of the apertures 22 provided in the upper plate 21 are preferably adapted to divide the gas 12 flowing through the conduit section 20 into several gas streams 23 or 23. jets of gas, in particular, depending on the type of gas 12 used and / or the pressure of the gas 12 supplied to the injector nozzle 3.

If the single gas stream 12 flowing through the conduit section 20 is divided into, for example, the two gas streams 23 shown in Figure 2, these gas streams 23 can have the same fluidic properties and magnitudes of speed, but lower flow than the single gas stream. Therefore, each gas stream 23 will entrain the stagnant primary air 11 surrounding each of the gas streams 23. Accordingly, the division of the single gas stream flowing through the conduit section 20 at the 23 separate gas streams causes the increase of the total air entrainment capacity of the injector nozzle 3.

This is based on the finding that the amount of primary air 11 that is sucked into the venturi tube 13 depends directly on the power level of the injector nozzle 3. The division of the gas stream flowing through the section of conduit 20 in the multiple gas streams 23 that exit the injector nozzle 3 divides the total power level and, thus, increases the amount of primary air 11 entrained by the gas streams 23. This increases the capacity of the injector nozzle 3 to entrain the primary air 11 surrounding the individual gas streams 23.

The gas streams 23 are thinner than a single stream of gas that would exit the injector nozzle 3 through a single central hole with the same cross-sectional area as the sum of the cross-sectional areas of the openings 22. Therefore, the finer gas streams 23 reduce their velocity when the gas and primary air 11 are mixed in the area below the venturi pipe 13 and inside the venturi pipe 13. Consequently, even in a particular space reduced for the venturi tube 13, it is possible to introduce a larger amount of primary air 11 into the mixture containing the gas 12 and the primary air 11. Also, the homogeneity of the mixture is improved before leaving the body of the burner or distributor of mixing 15.

The shape and / or the quantity and / or the arrangement of the openings 22 provided in the injector nozzle 3 are preferably adapted to the type of gas 12 used and to the level of power or pressure with which the gas 12 is supplied to the injection nozzle 3. By way of example, the calorific value of the gas 12 (ie the energy per unit mass or unit volume) can be taken into account to calculate the total cross-sectional area of the holes or openings 22 provided in the upper plate 21 of the injector nozzle 3. In general, the greater the number of holes, perforations, or openings 22 in the wall section, specifically, in the upper plate 21 of the injector nozzle 3, the greater the capacity of the injector nozzle 3 for primary air entrainment 11, as long as the openings 22 are spaced apart from each other in sufficient measure to create separate gas streams 23.

As can be seen well in Figure 3, for example, the gas 12 supplied to the section of conduit 20 with overpressure flows first through an inlet section of the conduit section 20, which is provided by a tube element 24. A final section of the duct section 20 is provided by a hat-shaped element 25, which is connected to the tube element 24 in a detachable manner. The hat-shaped element 25 has a flange section 26, which is pressed against an end face 27 of the pipe element 24. To achieve this, a fastening element 28 having an internal thread is screwed onto the pipe element 24. , having an external thread provided on the outer surface 29 of the tube element 24.

As can be seen from FIG. 5, for example, the fastening element 28 can have a hexagonal shape to facilitate the screwing of the fastening element 28 onto the pipe element 24. By separating the hat-shaped element 25 of the tube element 24, this part of the injection nozzle 3 can be easily changed, for example, depending on the type and / or the pressure of the gas 12 used in the gas burner 2 and / or depending on the air entrainment capacity Therefore, openings 22 or holes of variable diameters, variable quantity, variable arrangements, and variable shapes can be provided by fixing the appropriate hat-shaped element to the tube element 24.

In figures 6 to 9, possible shapes of the openings 22 are shown by way of example. As an example, according to figure 6, the openings 22 can be configured as elongated grooves that are parallel to each other. Other square and / or rectangular shapes of the openings 22 are also possible.

As can be seen in figure 7, the openings 22 can also have a double cone shape in such a way that the boundary of the openings 22 is not rectangular, but on opposite sides of each of the openings 22 it has triangles 33 that protrude inwards. These triangles 33 modify the shape of the square hole generally of the openings 22 shown in Figure 7. This increases the length of the boundary of the opening 22 as compared to a square shaped opening 22. Thus, there is a greater contact area between the gas stream 23 that leaves the opening 22 and the primary air 11 surrounding each of the gas streams 23. This causes a greater drag of the primary air 11.

This rather large limit of the opening 22 can also be achieved by a star-shaped shape of the openings 22 and / or a polygonal shape of the openings 22, the star-shaped shape being shown in FIG. 8 by way of example.

Finally, Figure 9 shows another form of the openings 22. Therefore, the openings 22 can also be arcuate in shape. However, it is possible to provide other shapes, dimensions, and arrangements of the openings 22 provided in the wall section or upper plate 21 of the injector nozzle 3 in order to promote good mixing of the gas 12 with the primary air 11.

As can be seen in figure 10, the gas cooker 1 usually has actuating elements 30 for actuating the gas burners 2, which can be arranged in the upper part of the front part of the oven 31 of the gas cooker 1 Furthermore, the gas cooker 1 can have a cooking chamber 32 which can also be heated by gas.

REFERENCE SYMBOLS

Gas stove

Gas burner

Injector nozzle

Superior iron

Support

Cooking pot

Base

Height

Injector support

Air entrance

Primary air

Gas

Venturi tube

Base part

Mixing distributor

Top

Arrow

Arrow

Call

Conduit section

Top plate

Opening

Gas current

Tube element

Hat-shaped element

Flange section

End face

Clamping element

Surface

Drive element

Front of oven

Cooking chamber

Triangle

Claims (10)

Injector device (3) for a gas burner (2) of a domestic appliance (1), where the injector device (3) has a section of duct (20) through which gas (12) flows during the operation of the gas burner (2), and a wall section (21) delimiting the conduit section (20), where the wall section (21) has an opening (22) through which the gas leaves the injector device (3) during the operation of the gas burner (2), characterized in that the wall section (21) has at least two openings (22) that are configured to divide a single stream of gas flowing through the section of conduit (20) during operation of the gas burner ( 2 ) in separate gas streams (23). Injector device (3) according to claim 1, characterized in that the at least two openings (22) are configured in such a way that the separated gas streams (23) carry a greater quantity of the air (11) surrounding the currents of gas (23) than a single gas stream with the same flow rate as the at least two gas streams (23) together. Injector device (3) according to claims 1 or 2, characterized in that the wall section is configured as upper plate (21) of the injector device (3). 4. Injector device (3) according to any of claims 1 to 3, characterized in that the conduit section (20) comprises an input section provided by a tube element (24) of the injector device (3) and a final section provided by a second element, in particular, by means of a hat-shaped element (25), connected to the tube element (24) in a detachable manner. Injector device (3) according to claim 4, characterized in that the hat-shaped element (25) has a flange section (26) that abuts on an end face (27) of the tube element (24). Injector device (3) according to claims 4 or 5, characterized in that the second element, in particular, the hat-shaped element (25) is removably attached to the tube element (24) by means of a fastening element ( 28). Injector device (3) according to claim 6, characterized in that the fastening element (28) has an internal thread which is fitted with an external thread provided on the outer surface (29) of the tube element (24). 8. Injector device (3) according to any of claims 1 to 7, characterized in that the at least two openings (22) have a round and / or rectangular and / or square and / or triangular and / or polygonal and / or starry shape and / or arched and / or double cone. Gas burner (2) with at least one injector device (3) according to any of claims 1 to 8, wherein the at least one injector device (3) is disposed downstream of a venturi device (13) of the burner of gas (2), where the Venturi device (13) is configured to draw air (11) from the surroundings of the injector device (3) to a mixing zone of the gas burner (2). Household appliance (1) with at least one gas burner (2) according to claim 9, wherein the at least one injector device (3) is arranged below an upper plate (4) of the domestic appliance (1).