Gas cock and gas cooking plate

0001The invention relates to a gas valve for a gas burner and a gas hob, in the of the gas valve is used, having an actuating shaft, which in a housing of the gas tap is rotatably and / or displaceably mounted axially, and with a Operating knob for applying a rotational and / or pushing movement on the Actuation shaft is connected, through a passage opening of a lid member the housing is made from the gas tap.

0002From DE 35 41 132 C2, a gas valve for burners is known. The gas valve has a Tap body having a lid in which a bore for supporting a Operating shaft is formed by means of a gas flow rate through the gas tap is set. Due to production tolerances is provided between an outer periphery of Actuating shaft and an inner periphery of the cover bore a game available, whereby the operating shaft is movable radially slightly. Such Radial movement of the actuating shaft is especially disadvantageous for actuating shafts, the project over a considerable length of the cover part of the gas tap.

0003The object of the present invention is a gas cock or a provide gas hob, in which an ease in setting a Gas throughput is improved by the gas tap.

0004The object is achieved by a gas cock with the features of claim 1 or achieved by a gas hob with the features of claim 11th Accordingly, is the gas tap a guide element associated with that the superior of the cover part Actuating shaft leads essentially without play. This allows an exact centric and steady guidance of the actuating shaft can be achieved, which in terms of Operating feel is beneficial. More Zentriermaßnahmen in the cooking field diaphragm, through which the actuating shaft is performed, so are not necessary.

0005Advantageously, the guide member as an axially elongated guide sleeve be formed. This is a large area of ​​sliding contact between Actuating shaft and the guide sleeve ensures. Manufacturing technology advantage is when the guide element consists of plastic. Thus, the his guide member inexpensively and easily manufactured as a plastic injection molded part.

0006A functionality of the guide element is increased when the guide element with is formed a holding flange, are supported on the additional components can, such as a printed circuit board or LEDs. The additional components are therefore directly supported on the gas tap. The result is a compact set of components several interacting components. The space requirement for the components in the Gas hob is therefore reduced. Additional mounting hardware for mounting the Additional components can be saved.

0007Preferably, the guide member can with at least one fastening element for Fastening be formed on the gas tap housing. It is advantageous if the fastening element via a releasable latching connection at the gas valve housing is supported.

0008It is advantageous if the retaining flange of the guide member at least one having recess that free access to a bypass nozzle of the gas tap allows. For a pre-setting of the gas tap the bypass nozzle is namely replaced. Such a replacement of the bypass nozzle can the freedom Your access be made without disassembling the guide element of the gas tap.

0009For an electronic detecting a rotational position of the operating shaft can be connected to the be attached actuating shaft a cam for the on rotation Operating shaft a switch is pressed, the signal to a corresponding one electronic control device passes. the switch can advantageously directly at or its holding flange mounted on the printed circuit board, in turn, to the retaining flange is mounted. This is a compact design and a reliable Interaction between the switching cams of the actuating shaft and the switch reached.

0010Preferably, the guide member may serve for the storage of the switching. Thereby is in a compact manner a simple and space-saving storage of the switching reached. the operating shaft advantageously can outside on the be mounted guide member rotatably.

0011According to one embodiment, the guide member may additionally provided with a be designed stroke stop. This can compared to the usually in the Gas tap provided Hubanschlägen be made much more robust. Against the stroke stop of the guide member, in one of the operating shaft applied pressure moving the operating shaft hit with their switching cams.

0012Further, the stroke stop of the guide element and the switch cam can in be formed with metal inserts the region of their contact surfaces. Thereby, a the Functioning of the gas tap impairing abrasion between the switching cam and the stroke stop of the guide member is reduced. In comparison to each other beating plastic surfaces can thus a friction-induced wear between the guide member and the cam switching can be reduced.

0013Subsequently, an embodiment of the gas cooktop according to the invention described with reference to the accompanying figures. Show it:<dl tsize="15"><dt>figure 1</dt><dd>the gas hob in a perspective view;</dd><dt>figure 2</dt><dd>a block diagram of an example for a gas burner of the Gas cooktop;</dd><dt>Figure 3a-3c</dt><dd>respectively in a perspective view a gas cock without Guide member, a gas valve with a mounted guide element and a gas tap with guide element and then stored Switching cam; and</dd><dt>figure 4</dt><dd>in a perspective partial view of four gas valves of the gas cooktop with associated circuit board and associated switch.</dd></dl>

0014The gas hob shown in Figure 1 has four schematically indicated gas burner 1, 3, 5, 7, which are guided by a cover plate 9 of the gas hob. front panel , the gas hob on a control bar 11th This is for each of the gas burners a respective control knobs 13, 15, 17, 19. Furthermore, each is the gas burner associated with a power indicator 21, 23, 25, 27, each of which is formed as an LED. Not shown are the Figure 1 the gas burner associated pot support for a parking of Gargutbehältnissen over the gas burners.

0015The operation of the gas cooktop is based on the block diagram of Figure 2 described. For clarity, the block diagram of Figure 2 is on the gas burner 1 with the associated control knob 13 and the operation display 21 limited. The further gas burner 3, 5, 7 are in a corresponding manner in the Gas hob connected. For a flame monitoring the gas burner 1, according the figure 2 is assigned a flame rod 29, with a presence of a Flame of the burner 1 is detected. Means of the flame can be a gap between the Flammenionisationselektrode 29 and the gas burner 1 are electrically bridged, so that an appropriate signal from the flame rod 29 via a Signal line 31 is passed to an electronic control device 33rd The electrical Controller 33 is via a further signal line 35 with a main valve 37 Connection. The main valve 37 is disposed in a main gas line 39 to a Gas supply system is coupled. On the output side, the main valve 37 is equipped with a Manifold 41, from the partial gas lines 42 respectively to the gas burners 1, 3, 5, perform. 7

0016In the figure 2, the gas path is only shown completely to the gas burner. 1 In the to the gas burner 1 part leading gas line 42 a gas tap 45 is arranged, with which a gas flow rate is adjusted to the gas burner. 1 Its operating shaft 47 is connected via a shift linkage 49 to the rotary knob. 13 A signal transmitter or switch 51 detects a rotational position of the actuation shaft 13 and outputs this via a line 53 to the electronic control device 33. In a corresponding manner be the rotational positions of the other control knobs 15, 17, 19 on the with dashed line indicated signal lines to the electronic control device 33 passed. The electronic control device 33, the operation display 21 of the Gas burner 1 controlled.

0017To start a burner operation is in accordance with Figure 2, the control knob 13 first rotated from its neutral position, in which the gas valve 45 in a closed position is. This initial rotation is detected by the signal transmitter 51, a corresponding signal to the electronic control device 33 conducts. then opens the electronic control device 33, the normally closed main valve 37, so that on the main gas line 39 and the partial gas line 42 a gas stream the Gas burner 1 is supplied. Simultaneously, the electronic control device 33 controls the ionization electrode 29 in order to ignite the gas burner. 1 An adjustment of the Gas stream to the gas burner 1 by means of the operating shaft 47 of the Gas valve 45. Meanwhile, the flow cross section by rotating the control shaft 47 be modified accordingly. During operation of the gas burner 1, the LED display 21 switched on permanently.

0018In the figure 4 is a perspective partial view of the output side to the Main valve 37 connected manifold 41 each with connected gas taps 45 shown. The gas cocks 45 are input side to the manifold 41 fluidly connected. are according to the present embodiment the gas taps shown in the Figure 4 45 for dual-circuit burner with an internal Flames circle and an outer circle of flames designed. Here is a function only of the rotational position of the control knob at low power settings inner circle of flames of the gas burner is supplied with gas. For larger Power settings are the gas tap additional gas supply to the outer Flame circular free of the gas burner. The gas taps shown in Figures 3a-3c 45 consequently have in each case two gas supply lines 53, 55th These are shown in Figures 3A to 3C and Figure 4 indicated by arrows and direct the gas flow to the inner and / or outer circle of flames of the associated gas burner.

0019In the figures 3a to 3c a gas tap 45 is shown in different mounting stages. According to the Figure 3a, the gas valve 45, a housing part 57, which usually consists of formed a brass casting. In the housing part 57 the actuating shaft 47 is rotatably and axially slidably supported. Depending on their rotational position sets the Operating shaft 47 with its provided inside the gas tap gas stopcock a gas flow cross-section fixed to the gas supply lines 53, 55th The gas valve 45 furthermore has a lid part 59, which usually consists of a steel sheet is formed and is screwed by means of screws 61 to the housing part 57th In the lid part 59 of the gas tap 45 is formed a through opening 63rd At this closes a cover-side guide flange on 65th Due to manufacturing tolerances, the Operating shaft 47 with clearance through the lid portion 59th In the Figure 3b is the Gas valve 45 is shown with a sleeve-like guide element 67th The out of the Cover part 63 projecting actuating shaft 47 is hollow cylindrical through Guide member 67 out. There is almost no play in sliding contact with the Actuating shaft 47th

0020The sleeve-like guide element 67 is at one of the gas tap end facing a retaining flange 69 is formed, having the circumferential latching elements 71st These engage behind an edge projection 73 of the lid member 63, so that the retaining flange 69 is pressed firmly against an annular shoulder 75 of the cover part 63rd The retaining flange 69 of the Guide member 67 also has two recesses or peripherally recessed portions 77, 79. This is a replacement of bypass nozzle 81, 83 of the gas tap is made possible without the guiding element 67 to of the gas tap to solve.

0021In the Figure 3c is a sleeve portion 85 of the guide member 67 hollow cylindrical shift cam 87 is rotatably mounted. The switch cam 87 is at its upper end 89 fixedly connected to the actuating shaft 47th It should by in the figure 3a shown transverse bore 91 in the actuation shaft 47 an unrepresented Metal pin out. Subsequently, the switching cam 87 to the guide member 67 is set. The metal pin is positively locking in this way in a recess arranged, which is formed on the inside on the end face 89 of the switching cam 87th The switch cam 87 is therefore radially rotatably connected to the actuating shaft 47 connected. An axial displacement of the switching cam 87 along the actuation shaft 47 is prevented by a plugged onto the actuating shaft 47 snap ring 93rd Of the Switching cam 87 is thus with its end face 89 between the snap ring 93 and the Metal pin, not shown, arranged.

0022When applying a compressive movement of the actuating shaft 47 beats not illustrated metal pin against a shown in the figure 3b frontal stroke stop 94 the guide element 67. This limits the pressure movement of the actuating shaft 47th

0023To an abrasion between the metal pin and the front end stroke stop 94 of the to reduce the guide member 67, allows the stroke stop 94 a metal washer be placed. In case of a pressure movement of the metal pin of the actuating shaft proposes 47 on the metal disc.

0024At the holding flange 69 is in the figure 3b circumference a protruding Portion 95 is formed, which has a fastening opening 97th As in the Figure 4 is shown, the mounting hole 97 is supplied with a corresponding mounting hole 98 an elongated circuit board 99 aligned. Through the assembly opening 98 and an order by the aligned mounting hole 97 on the guide element 67 not shown connecting element are inserted. The circuit board 99 is therefore without large assembly effort with the support flange 69 of the guide member 67 to connect. On the circuit board 99, the switch 51 and the indicators are 21 assembled. This is in terms of assembly simply a compact Component set consisting of the switches 51, the printed circuit board 99, the Operating displays 21, the guide elements 67 achieved with the gas taps 47th