FR2788840A1 - Gas burner for cooker has starting plug and safety thermocouple place on inlet tube and under burner body - Google Patents

Abstract

Gas burner has inlet tube (1), burner body (2), burner cap (3), starting plug (9) and safety thermocouple (10). Starting plug and thermocouple are placed on supporting unit (4), on inlet tube, and under burner body. Aperture (11) is placed on periphery of burner body where part (12) of supporting bloc is placed.

Description

The present invention relates to a gas burner for an apparatus for

  cooking, this invention being applicable in particular to tables of

professional cooking.

  In general, "open fire" gas burners are already known, consisting essentially of a mixing tube, a burner body and a burner cap. The mixing tube provides the air / gas mixture necessary for combustion by "atmospheric induction". The burner body completes the mixing at the outlet of the mixing tube, ensuring the "relaxation" of the mixture before leaving. The burner cap ensures the outlet of the mixture and the diffusion of the flame, divided into a

  multiplicity of flame elements.

  Gas burners of this type are most often also equipped with elements necessary for ignition and safety, more particularly for monitoring the presence of the flame. These elements are, in practice, a spark plug or pilot light and a flame safety thermocouple. These additional ignition and safety elements must naturally be suitably arranged, relative to the other components of the burner, so as to ensure their functions, while being as far as possible protected, in particular with regard to the stains resulting from the overflowing of the contents. containers placed on the burner. Indeed, these are sensitive elements which risk being disturbed or rendered inoperative by such stains, and which in any case require, in the event of soiling, an inconvenient cleaning and which itself may cause a disturbance. , if it is accompanied by a disassembly

of the elements concerned.

  Most often, we still use add-on solutions, with the installation of a spark plug or pilot light and the flame monitoring thermocouple at the periphery of the burner, and the addition of a sheet metal part from cover these elements to best protect them. These solutions remain complicated in terms of structure and mounting, do not provide optimal protection of sensitive elements, and do not meet the current concern of integration of

all functions.

  A first integration solution consists in producing burners in the form of an annular pot, and in placing the spark plug or pilot light and / or the flame safety thermocouple in the central recess of this pot - see for example the patents French 2,545,196, 2,570,804 and 2,594,214, as well as English patents 1,348,245 and

1,543,618.

  Other solutions use the burner cap as the ignition electrode, which implies a very specific embodiment - see Dutch patent application 7,808,145 and English patent application 2,085,576. Furthermore, this does not resolve the mounting problem and

  protection of the flame monitoring element.

  Finally, proposals have been made to use the burner body, and / or the outer edge of the burner cap, to protect the ignition electrode and / or the flame safety thermocouple, placed at the periphery of the head. of the burner - see English patent 1,387,633 and European patent application 0 859 191. Protection of the elements

  sensitive, again, still imperfect.

  The present invention aims to remedy the drawbacks of existing solutions, recalled above, by providing a new solution truly integrating the ignition and safety functions in the burner head, so as to effectively protect all sensitive elements, to facilitate cleaning the assembly, and improving the

  reliability and operational safety of the burner.

  To this end, the subject of the invention is essentially a gas burner of the kind indicated in the introduction, that is to say composed of a mixing tube, a burner body and a burner cap, and also provided with a spark plug and a flame safety thermocouple, this burner being characterized in that the spark plug and the flame safety thermocouple are mounted on a common support block, positioned on the mixing tube and under the burner body, this body having at its periphery an opening in which is engaged,

  or through which a part of said support block appears.

  The invention is thus characterized by the addition of a fourth component, which can be designated as "safety ignition block" or "pilot and safety block", which is positioned in the continuity of the tube

  mixer and under the burner body.

  According to one embodiment of the invention, the support block has on its upper face three through orifices, namely a gas mixture orifice for forming a pilot flame,

- 1 1 '

  an orifice constituting a housing covering the spark plug and an orifice constituting another housing, receiving the safety thermocouple

of flame.

  The support block being normally partially covered by the upper part of the burner body, the gas mixture leaving through the corresponding orifice will be "channeled" horizontally towards the outside of the block, then will "go up" on the periphery of the body to lick the underside of the edge of the burner cap, starting point of the elements

  flame diffused by the burner cap.

  Advantageously, the external part of the support block considered, engaged in the peripheral opening of the burner body, is

  located in continuity with the outer edge of the burner body.

  Thus, the ignition and safety assembly is integrated into the environment of the burner body, both structurally and

  functionally and aesthetically.

  The gas burner, object of the invention, thus has numerous and important advantages: - The ignition and safety elements as well as their adjustment means are effectively protected from the resulting stains

  container overflows placed on the burner.

  - These elements, being "embedded", are also protected from the risk of adjustment during maintenance cleaning or afterwards

mechanical shock.

  - The protective function of the said elements is obtained without the addition of added parts, and on the contrary by grouping

  these elements on a single block, simplicity and economy.

  - The externally "smooth" appearance of the burner facilitates its

  cleaning and contributes to its aesthetic character.

  - The design of the burner, object of the invention, still allows for a removable burner cap and body, removable without tools, which facilitates cleaning of the assembly (both cleaning the cap and the body of burner, that cleaning the ignition and safety block,

  fully accessible after removing the hat and body).

  - Finally, the design of this burner improves safety. In particular, the pilot light being permanent, if the body and the V -

  hat are removed (for cleaning for example - see below)

  above) without the user extinguishing it, the pilot flame will come out vertically from the corresponding orifice of the block, and will no longer "lick" the safety thermocouple; the latter will then automatically and quickly cut off the gas supply to the burner, thus preventing possible ignition of the mixture in the event that an unfortunate heating request occurs before the main burner elements,

  know the body and the hat, are put back in place.

  The invention will in any case be better understood using the

  description which follows, with reference to the attached schematic drawing

  showing, by way of example, two embodiments of this burner with

gas for cooking appliance.

  - Figure 1 is an overall view, in perspective from above, of a gas burner according to the present invention, in the assembled state - Figure 2 shows the same gas burner, in the assembled state, but seen in perspective from below; - Figure 3 is an exploded perspective view of this gas burner; - Figure 4 is a partial perspective view, on an enlarged scale, showing the detail of the ignition and safety block; Figure 5 is an overall perspective view of a

  variant of the gas burner according to the invention.

  The gas burner, shown as a whole in FIGS. 1 and 2, consists of a mixer tube 1, of angled shape, of a burner body 2 of frustoconical shape under which the mixer tube 1, d '' a burner cap 3 of circular shape surmounting the body of

  burner 2, and an ignition and safety block 4, positioned on the tube-

  mixer 1 and under the burner body 2.

  The ignition and safety block 4, clearly visible in FIGS. 3 and 4, has a recess 5 hollowed out on its upper face, and opening out on the outside of this block 4. In the recess 5, three are provided

  through holes 6, 7 and 8, with vertical axes.

  The first orifice 6 is in communication, via an internal channel (not shown) of the block 4, with the mixer tube 1; it is used here to supply the gaseous mixture necessary to maintain a permanent pilot flame. The second orifice 7, located a short distance from the previous one, serves as a housing for a spark plug 9 which is used to ignite the gaseous mixture exiting through the first orifice 6, in order to form the pilot flame. The third orifice 8, located a short distance from the previous two, serves as a housing for a flame safety thermocouple

  , which monitors the presence of the pilot flame.

  The burner body 2 has at its periphery an opening 11, shaped as a notch or notch, in which is engaged the outer part 12 of the block 4, that is to say its part farthest from the central axis of the burner . As shown in particular in Figure 1, this outer part 12 of the block 4, engaged in the opening 11 of the burner body

  2, is located in the continuity of the outer edge 13 of this burner body 2.

  When the burner body 2 is thus fitted onto the ignition and monitoring block 4, the annular upper part 14 of this

  body 2 overcomes block 4, in particular in the region of recess 5.

  Thus, the flaming mixture exiting through the orifice 6 arrives under the upper part 13 of the burner body 2, and it is "channeled" horizontally towards the outside of the block 4 before "rising" to the periphery of the body 2 to finally come and lick the base of the burner cap 3,

  starting point of the flame elements starting from this cap 3.

  If the burner body 2 and the cap 3 are removed, the block 4 is completely uncovered. If the pilot flame is not extinguished beforehand by the user, this flame will exit vertically through orifice 6, and will no longer come to lick the flame safety thermocouple 10. The latter will then cut off the gas supply to the burner, thereby preventing possible ignition of the gas mixture if an unfortunate heating request occurs, even before the burner body

  2 and the burner cap 3 are replaced.

  As also shown in FIGS. 1 and 2, the housing of the block 4 under the burner body 2 protects the spark plug 9

  and flame safety thermocouple 10, carried by this block 4.

  Figure 5 shows another embodiment of the gas burner. The opening 11 formed in the burner body 2 has here a reduced extent, and does not reach the outer edge 13 of the body 2. The ignition and safety block 4 is practically not engaged in the opening 1 1, but it is flush with said opening, and remains visible through this opening 11. Thus, the block 4 is even better integrated and protected under the burner body 2, while ensuring its functions. It goes without saying that the invention is not limited to the sole embodiments of this gas burner for cooking appliance which have been described above, by way of examples; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. In particular, one would not depart from the scope of the invention: - by modifying the external shapes of the body and of the burner cap, as well as of the ignition and safety block; - by modifying, on the support block, the relative positions of the spark plug, the flame safety thermocouple and the gaseous mixture outlet of the pilot; - by using the same burner for cooking appliances other than professional hobs, for example cooking appliances

domestic cooking.

Claims (4)

  1 - Gas burner for cooking appliance, consisting of a tube-   mixer (1), a burner body (2) and a burner cap (3), and also provided with a spark plug (9) and a flame safety thermocouple (10) , characterized in that the spark plug (9) and the flame safety thermocouple (10) are mounted on a common support block (4), positioned on the mixing tube (1) and under the burner body (2 ), this body (2) having at its periphery an opening (11) in which is engaged, or through which appears, a part (12) of said support block (4).   2 - Gas burner according to claim 1, characterized in that the support block (4) has on its upper face (5) three through orifices, namely an orifice (6) for supplying gas mixture to form a flame pilot light, an orifice (7) constituting a housing receiving the spark plug (9), and an orifice (8) constituting another   housing, receiving the flame safety thermocouple (10).   3 - Gas burner according to claim 2, characterized in that the three aforesaid orifices (6, 7, 8) are formed in a recess (5), hollowed out on the upper face of the support block (4) and opening on the side outside of this support block (4).   4 - Gas burner according to any one of claims 1 to   3, characterized in that the external part (12) of the support block (4), engaged in the peripheral opening (11) of the burner body (2), is located   in continuity with the outer edge (13) of the burner body (2).   - Gas burner according to any one of claims 1 to   4, characterized in that it is a burner with a permanent pilot light, and in that the removal of the burner body (2) and the burner cap (3), revealing the support block (4), causes the vertical exit of the flame through the corresponding orifice (6), so that this flame no longer comes to lick the safety thermocouple (10), the latter then cutting   automatically supply gas to the burner.