EP2240723A1

EP2240723A1 - Gas hob and gas burner for a gas hob of this type

Info

Publication number: EP2240723A1
Application number: EP09709112A
Authority: EP
Inventors: Luis Acosta Herrero; Ainhoa De Carlos Negro; Pedro Herrera Estrada; Jose Leon Garcia; Alberto Lopez Ortiz; Luis Antonio Palacios Valdueza; Emilio Placer Maruri; Almudena Verdeja Galnares
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2008-02-04
Filing date: 2009-01-19
Publication date: 2010-10-20
Also published as: ES2349992A1; WO2009098117A1; ES2349992B1; CN101983306A; CN101983306B

Abstract

The invention relates to a gas burner for a gas hob with an associated ignition electrode (13) for igniting the gas burner (1). An adjusting device (15) is allocated to the electrode, said device allowing the operating position of the ignition electrode (13) to be adjusted vertically (z) in relation to gas outlet openings (7) of the gas burner (1).

Description

Gas hob and gas burner for such a gas hob

The invention relates to a gas burner according to claim 1 and a gas hob according to claim 21.

The gas burners of a gas hob are associated with ignition electrodes for igniting the respective gas burner. For a trouble-free ignition of the gas burner, the ignition electrodes are to be fixed in exact position relative to the gas outlet openings of the gas burner. Such a generic gas hob is known from DE 30 33 647 A1.

Due to manufacturing tolerances in the manufacture of the gas hob or when operating with different types of gas, it may be necessary to adjust the operating position of the ignition electrode after completion of the gas hob.

The object of the present invention is to provide a gas burner or gas hob, in which a simple readjustment of an ignition electrode associated with a gas burner is made possible.

The object is solved by the features of claim 1 or claim 21. Advantageous developments of the invention are disclosed in the subclaims.

According to claim 1 of the ignition electrode is associated with an adjusting device with which the ignition electrode is adjustable in a height direction relative to the gas outlet openings of the gas burner. The gas burner may have a support section, which carries the adjusting device for height adjustment of the ignition electrode. By actuating the adjusting device, the ignition electrode can be adjusted in height in its axial direction.

It is advantageous if, in the installed state of the gas burner in the gas hob, the support section of the gas burner is arranged below a gas hob cover plate and spaced therefrom. In this case, the ignition electrode is independent of the gas cooking Field cover plate supported in the support portion and protrudes only through a corresponding passage opening in the cover plate.

The support section with the adjusting device for the ignition electrode can be integrated into the gas burner in the same material and / or in one piece. Alternatively, the support section can also be mounted as a separate component on the gas burner. In both cases, the gas burner forms together with the support portion an independent of the gas hob pre-assembled unit.

In a simple embodiment, the adjusting device can have a threaded channel with whose internal thread the ignition electrode is screwed. The ignition electrode can therefore be adjusted in height by simple turning operation relative to the support section. To fix the thus re-adjustable ignition electrode may be provided a securing element, such as a lock nut, which is screwed onto the guided through the support portion male threaded portion of the ignition electrode.

In contrast to the above embodiment, the adjustment can have a separate, height-adjustable relative to the support member component on which the ignition electrode is supported. Advantageously, the separate component may be an adjusting sleeve with an external thread, which is screwed into a corresponding internal thread of the Tragab- section. At the upper end of the adjusting sleeve, the ignition electrode may be supported. With appropriate rotational actuation of the adjusting sleeve, therefore, the height adjustment of the ignition electrode.

In order to avoid lifting off the ignition electrode supported on the abovementioned component, a spring element can be supported between the ignition electrode and a movement stop of the gas burner or a cover plate of the gas hob, which presses the ignition electrode onto the component or the adjusting sleeve.

Preferably, between the ignition electrode and the height-adjustable component or the adjusting sleeve, a further intermediate element may be connected, which is rotationally fixed relative to the adjusting sleeve and only height-adjustable. In this way, it is ensured that during rotary actuation of the adjusting sleeve, the ignition electrode does not rotate, but is rotatably supported on the intermediate element. As already mentioned, the support section for the ignition electrode can be fixedly mounted on the gas burner. Alternatively, the support portion by means of an adjustment, such as a set screw, also be performed adjustable in height on the gas burner. During a rotary movement of the adjusting screw, therefore, the support section is height-adjusted relative to the gas burner. The set screw is rotatable in this case and held stationary in the vertical direction.

In addition to the ignition electrode, the support portion can also carry a known thermocouple for a Zündsicherung the gas burner.

Alternatively to the above-mentioned height adjustment of the support portion of this can also be pivotally mounted on the gas burner or separately on a bearing support in a horizontal plane pivotally. Laying down a pivot position may be provided in the support portion as a clamping means a clamping screw which presses against a bearing journal of the bearing support to which the support portion is pivotable.

Additionally or alternatively, the adjusting device may also have a clamping screw with which the ignition electrode is fixable. In this case, the ignition electrode can be guided in a freely displaceable manner in a receiving channel of the support portion with a released clamping screw height adjustable.

In a further embodiment, the support portion may comprise a housing in which the ignition electrode is inserted and is held vertically guided therein. For a positionally correct positioning, the ignition electrode may be supported in the housing on a spring element. The spring element presses the ignition electrode against a movement stop provided on the gas burner or on a cover plate of the gas hob. Regardless of manufacturing tolerances is therefore always guaranteed that the ignition electrode is pressed with its abutment shoulder against the movement stop.

Below, seven embodiments of the invention with reference to the accompanying figures are shown.

Show it: 1 is a schematic partial sectional view of a gas hob with a gas burner according to the first embodiment;

Fig. 2 in a view corresponding to FIG. 1, a gas hob according to the second

Embodiment;

Fig. 3 in an enlarged side sectional view of a gas burner according to the third

Embodiment;

4 shows an exploded view of a gas burner according to the fourth exemplary embodiment in partial section;

5 shows a partial sectional view of a gas hob according to the fifth embodiment; and

6 and 7 each show a partial sectional gas hob according to the sixth and seventh embodiments.

FIG. 1 shows, in a roughly schematic side view, a detail of a gas hob with a gas burner 1. The main body 3 carries above the cover plate 5 provided with a gas outlet openings 7 burner head 8. On the burner head 8 sits a, the burner head radially superior burner cap. 9

The main body 3 of the gas burner 1 is provided at a free distance a below the cover plate 5 with a support bracket 1 1, which may be integrally formed integrally on the base body 3 of the gas burner 1 and integrally. According to FIG. 1, the support bracket 1 1 projecting in the horizontal direction from the main body 3 carries a thermoelement 12 known per se for ignition protection of the gas burner 1. In addition, a supporting arm 14 for an ignition electrode 13 is an approximately z-shaped support arm screwed a screw with the support bracket 1 1. The support arm 14 is part of an adjusting device 15, with which the ignition electrode 13 is height-adjustable in the z direction. With the height-adjustable ignition electrode 13 manufacturing tolerances after the Assembly of the gas burner 1 are compensated in the gas hob. In addition, the height position of the ignition electrode 13 of the type of gas used can be adjusted.

The adjusting device 15 has, according to FIG. 1, on a support arm leg projecting from the support bracket 1 1, a threaded channel 16 with an internal thread, in which a lower external thread section 17 of the ignition electrode 13 is screwed.

At the bottom, guided by the threaded channel 16 end of the male threaded portion 17 a lock nut 18 is screwed as a securing element. The lock nut 18 is clamped via a lock washer 19 with the support arm 14. In this way, the ignition electrode 13 can be secured in its adjusted height position.

For adjusting or readjusting the operating position of the ignition electrode 13 in the height direction z, the lock nut 18, which is braced with the support arm 14, must first be released. Subsequently, its height position can be adjusted by screwing the ignition electrode 13. After adjustment of the ignition electrode 13, the lock nut 18 is again clamped to the support arm 14.

The ignition electrode 13 is supported independently of the cover plate 5 at the free distance a below the cover plate 5 on the support arm 14. Advantageously, therefore, the cover plate 5 is free of brackets for the ignition electrode 13. The ignition electrode 13 protrudes rather without contact by an opening provided in the cover 5 mounting opening.

2, a gas hob according to the second embodiment is shown, whose components are substantially identical to the components shown in FIG. In this respect, reference is made to the description of FIG. 1 reference. In a departure from FIG. 1, the adjusting device 15 additionally has a separate adjusting sleeve 21. The adjusting sleeve 21 is connected between the support arm 14 and the ignition electrode 13. In contrast to FIG. 1, the external thread 17 is not provided directly on the ignition electrode 13, but on the adjusting sleeve 21, which is in screw connection with the threaded channel 16 of the support arm 14.

As is further apparent from FIG. 2, the ignition electrode 13 is with its lower portion 23 almost free of play, ie, a form fit in a passage 24 of the adjusting sleeve 21st used. In this case, the ignition electrode 13 is supported on its end face on the adjusting sleeve 21 via its radially widened annular web 25 provided in the middle region. For a fixed support in the adjusting sleeve 1, the ignition electrode 13 may alternatively be plugged into the adjusting sleeve 21 in clamping connection.

As in the first embodiment, the ignition electrode 13 is guided with its upper portion contactless and without intervention by the cover plate 5 in the vicinity of the gas outlet openings 7 of the burner head 8 here, too.

The adjusting sleeve 21 has at its lower end further on a radially outer annular collar 26 which comes in a corresponding screwing movement of the adjusting sleeve 21 upwards as a movement stop with the underside of the support arm 14 in abutment.

According to FIG. 2, the gas hob is provided with a housing bottom 27 which has an access opening 28. Through the access opening 28, a tool in contact with the adjusting sleeve 21 can be guided to actuate them. As a tool approach, the annular collar 26 may accordingly have a polygonal profile.

Analogously to FIG. 2, in the third exemplary embodiment of FIG. 3, too, the adjusting device 15 has an adjusting sleeve 21 with the external thread 17. The adjusting sleeve 21 is likewise designed for tool access at the lower end with a tool attachment 26. In contrast to FIG. 2, in FIG. 3, the setting sleeve 21 is inserted together with the ignition electrode 13 in a hollow cylindrical, sleeve-shaped housing 29, which in turn is pressed into a mounting hole of the support section 14 of the gas burner 1. The adjusting sleeve 21 is with its external thread 17 in screw connection with an internal thread of the housing 29, not shown here.

As is apparent from Fig. 3, the radially expanded annular ridge 25 of the ignition electrode 13 is not supported directly on the rotatably actuable adjusting sleeve 21, but with the interposition of a designed as a support sleeve intermediate member 30. The support sleeve 30 is provided with an upwardly open guide slot 31, in a housing-fixed guide pin 32 protrudes. Although the support sleeve 30 is thus guided vertically adjustable in the housing 29; However, it remains by means of the guide pin 32 against rotation of the adjusting sleeve 21. Accordingly remains at rotational actuation of the adjusting sleeve 21 and the ignition delektrode 13 rotatably supported on the support sleeve 31. As a result, it is advantageously avoided that the guided through the support sleeve 31 and the adjusting sleeve electrical line 48 is rotated at rotational actuation of the adjusting sleeve 21 with.

To support the ignition electrode 13, the support sleeve 30 on its upper end side on the inner peripheral side on a circumferential annular shoulder 33 with a correspondingly expanded inner diameter. On the annular shoulder 33, the ignition electrode 13 is supported in the transverse direction substantially free of play over its annular web 25.

The upper edge 34 of the sleeve-shaped housing 29 is folded horizontally inwardly folded. The upper edge 34 therefore limits a passage opening for the ignition electrode 13, whose diameter is reduced in comparison to the housing inner diameter. At the same time, the upper edge 34 serves as a support stop, between which and the annular web 25 of the ignition electrode 13 as a spring element 35 a coil spring is supported. The coil spring 35 presses the ignition electrode 13 with a spring force against the inner annular shoulder 33 of the support sleeve 30, whereby a location of the ignition electrode 13 fixed in the height direction z is supported on the support sleeve 30.

In a screwing-in movement of the adjusting sleeve 21, the supporting sleeve 30 seated thereon is pushed together with the ignition electrode 13 counter to the spring force of the helical spring 35 upwards. The support of the coil spring 35 does not have to be done on the upper edge of the housing 34. In a departure from FIG. 3, the helical spring 35 can also be supported on the underside of the cover plate 5 in a correspondingly open housing 29.

4 shows an exploded view in half section of a section of a gas hob according to the fourth embodiment. Accordingly, the support body 3 is inserted via its support ring 14 designed as a mounting ring in a mounting opening of the cover plate 5 of the gas hob. The annular disc 14 protrudes with its inner peripheral edge in an annular groove 39 of the supporting body 3 and is secured therein in a known manner by means of a snap ring 40. With its folded outer edge 41, the annular disk 14 is supported on the upper side on the mounting opening edge of the cover plate 5 and possibly glued to this. The annular disk 14 also has a passage opening 42 for the ignition electrode 13. The ignition electrode 13 protrudes - as in Fig. 3 - in a sleeve-shaped housing 29, which forms part of the adjusting device 15 and is provided on the underside of the mounting plate 14. The ignition electrode 13 is supported with its annular web 25 on a spring element 35, ie a support spring. This is connected in the housing 43 between the annular web 25 and a lower opening edge 47, which limits a passage opening for the electrical line 48 of the ignition electrode 13.

When assembling the gas burner 1, the burner head 8 is placed on the support body 3. Here, the upper portion of the ignition electrode 13 is guided through a lateral through hole 49 of the burner head 8 and presses the lower opening edge 51 of the through hole 49 against the annular web 25 of the ignition 13. The ignition electrode 13 is thereby against the force exerted by the spring 45 spring force vertically downwards pressed and biased against the opening edge 51 of the burner head 8.

According to FIG. 4, manufacturing tolerances in the height direction z can thus be compensated by the spring travel provided by the support spring 35. At the same time it is ensured that despite the manufacturing tolerances in the height direction z, the ignition electrode 13 is always biased in the correct position against the burner head 8.

5, a modification of the fourth embodiment shown in FIG. 4 is shown according to the fifth embodiment. Accordingly, a support portion 14 is integrally formed on the support body 3 of the gas burner 1, which is screwed at its outer ends via an indicated screw to the underside of the gas hob cover plate 5. As in FIG. 4, a housing 29 is also provided in FIG. 5, into which a lower section of the ignition electrode 13 protrudes, and the ignition electrode 13 is supported on the support spring 35.

In contrast to Fig. 4, however, the ignition electrode 13 is not biased against the burner head 8, but against the cover plate 5, ie against the, the passage opening of the ignition electrode 13 delimiting opening edge 53 of the cover plate 5. In this way, the ignition electrode 13 in the installed position is always pressed against the cover plate 5. A tolerance-related deviation of the gas burner 1 relative to the cover plate 5 in the height direction z is therefore compensated by the provided by the support spring 35 travel. The ignition electrode 13 therefore remains independent of a tolerance dingt changing height position of the gas burner 1 always in contact with the cover plate. 5

FIG. 6 shows a detail of a further gas hob according to the sixth exemplary embodiment. As in the preceding exemplary embodiments, the adjusting device 15 also has a supporting section 14 assigned to the supporting body 3 of the gas burner. This is designed as a two-armed arm, which carries both the ignition electrode 13 and the thermocouple 12. In contrast to the preceding embodiments, in FIG. 6, the ignition electrode 13 is not height adjustable relative to the support arm 14, but this is stationary in the support arm 14 is supported. The support arm 14 is in contrast arranged vertically adjustable by means of a set screw 54 on the support body 3 of the gas burner 1. For this purpose, the support arm 14 via vertically indicated guide elements 52 height adjustable on the support body 3 of the gas burner 1 is supported. In contrast to the first to third embodiments, therefore, the free distance a between the support arm 14 and the cover plate 5 by rotation of the adjusting screw 54 is variable.

The adjusting screw 54 has according to FIG. 6 in its screw head 55 an annular gap 56, in which a provided on the support body 3 of the gas burner 1 screw holder 57 protrudes and so holds the screw 54 in the vertical direction z stationary. The screw head 54 also protrudes through a mounting opening of the cover plate 5, so that the adjusting screw 54 is rotationally operable from the outside in a simple manner. Simultaneously with the ignition electrode 13 and the thermocouple 12 is adjusted in height during a rotary actuation of the screw 54.

In the adjusting device 15 of the seventh embodiment according to FIG. 7, the support portion 14 is also not fixedly mounted on the support body 3 of the gas burner 1, but movably mounted. The support portion 14 is here a pivot arm which is rotatably supported on a support bearing 59 which is fixed independently of the support body 3 of the gas burner 1 on the housing bottom 27 of the gas hob. In this case, a bearing pin 61 of the support bearing 59 protrudes through a corresponding bearing opening 62 of the pivot arm 14. At the free end of the pivot arm 14, the ignition electrode 13 is inserted axially displaceable in a receiving channel 63. In order to determine the height position of the ignition electrode 13, a clamping screw 64 inserted in the transverse direction is provided in the swivel arm 14 intended. With the clamping screw 64, the ignition electrode 13 can be clamped in the receiving channel 63. To establish a pivoting position of the pivot arm 14, a further clamping screw 65 is provided, with which the pivoting position of the support arm 14 can be determined. The two clamping screws 64, 65 can be actuated via the access openings 28 in the housing bottom 27 by means of a tool.

LIST OF REFERENCE NUMBERS

1 gas burner 41 mounting disk outer edge

3 supporting body 42 mounting opening

5 cover plate 47 caseback

7 gas outlet openings 48 electrical line of the

9 burner cover ignition electrode 13

1 1 support bracket 49 torch head

12 thermocouple entry opening

13 ignition electrode 51, 53 opening edge

14 support arm 52 guide elements

15 Adjusting device 54 Adjusting screw

16 threaded channel 55 screw head

17 external thread 56 annular gap

18 securing element 57 screw holder

19 Lock washer 59 Support bearing

21 adjusting sleeve 61 bearing pin

23 lower portion of the ignition electrode 13 62 bearing opening

24 passage opening of the adjusting sleeve 21 63 receiving channel

25 Ring bar of the ignition electrode 13 64, 65 Clamping screws

26 Tool attachment a free distance

27 Gas hob housing bottom Z Height direction

28 tool access opening

29 ignition electrode housing

30 support sleeve, intermediate element

31 guide slot

32 guide pins

33 frontal edge of the housing 29th

35 spring element

39 annular groove in the supporting body 3

40 snap ring

Claims

1. Gas burner for a gas hob with an associated ignition electrode (13) for igniting the gas burner (1), which is associated with an adjusting device (15), with an operating position of the ignition electrode (13) in a height direction (z) with respect to gas outlet openings (7) of the gas burner (1) is adjustable.

2. Gas burner according to claim 1, characterized in that the adjusting device (15) has a support portion (14) which carries the ignition electrode (13).

3. Gas burner according to claim 1 or 2, characterized in that the ignition electrode (13) is height-adjustable in the direction of its longitudinal axis.

4. Gas burner according to claim 1, 2 or 3, characterized in that in the installed state of the gas burner (1) in the gas hob of the support portion (14) of the gas burner at a distance (a) below a cover plate (5) of the gas hob is arranged.

5. Gas burner according to one of the preceding claims, characterized in that the support portion (14) of the same material and / or integrally on the gas burner (1) is integrated.

6. Gas burner according to one of claims 2 to 4, characterized in that the support portion (14) as a separate component on the gas burner (1) can be mounted.

7. Gas burner according to one of the preceding claims, characterized in that the adjusting device (15) has a threaded channel (16), with the internal thread of the ignition electrode (13) or the ignition electrode (13) supporting adjusting element (21) is in screw connection ,

8. Gas burner according to claim 7, characterized in that the ignition electrode (13) or the adjusting element (21) via a securing element (18) in the support portion (14) is secured, in particular one on the ignition electrode (13) but the adjusting element (21 ) screwed lock nut is.

9. Gas burner according to claim 7 or 8, characterized in that the adjusting element (21) is an adjusting sleeve with a passage opening (24) in which the ignition electrode (13) is inserted.

10. Gas burner according to one of the preceding claims, characterized in that the ignition electrode (13) by means of a spring element (35) is biased.

1 1. Gas burner according to claim 10, characterized in that the spring element (35) presses the ignition electrode (13) against the adjusting element (21).

12. Gas burner according to one of claims 7 to 11, characterized in that between the ignition electrode (13) and the adjusting element (21), an intermediate element (30) is connected, which decouples the ignition electrode (13) from a rotational movement of the adjusting element (21) ,

13. Gas burner according to claim 10, characterized in that the ignition electrode (13) on the spring element (35) is supported, which presses the ignition electrode (13) against a reference stop in the installed position, as against the cover plate (5), the gas burner head (8 ) or a firing electrode housing edge (34).

14. Gas burner according to one of claims 6 to 13, characterized in that the support section (14) is adjustable in height on the gas burner (1) is guided.

15. Gas burner according to claim 14, characterized in that for height adjustment of the support portion (14) an actuator, in particular an adjusting screw (54), is provided, which is in operative connection with the support portion (14).

16. Gas burner according to claim 15, characterized in that the adjusting screw (54) is mounted rotatably and in the height direction (z) immovable on the gas burner (1).

17. Gas burner according to one of the preceding claims 2 to 16, characterized in that the supporting portion (14) additionally carries a thermocouple (12) for a Zündsicherung the gas burner (1).

18. Gas burner according to one of claims 6 to 17, characterized in that the support portion (14) is pivotally mounted in a horizontal plane.

19. Gas burner according to claim 18, characterized in that for fixing a pivot position in the support section (14) a clamping means, in particular a clamping screw (65) is provided which presses against a bearing pin (61) to which the support portion (14) is pivotable ,

20. Gas burner according to one of the preceding claims, characterized in that the adjusting device (15) has a receiving channel (63) in which the ignition electrode (13) is displaceably guided, and preferably a clamping means, such as a clamping screw (64), with which the ignition electrode (13) can be fixed in a height position.

21. Gas hob with at least one gas burner (1) according to one of the preceding claims.

22. Gas hob according to claim 21, characterized in that in the housing bottom (27) of the gas hob, a tool access opening (28) for actuating the adjusting device (15) is provided.