FR2878939A1 - DEVICE AND METHOD FOR GAS SUPPLYING A BURNER FROM A COOKING APPARATUS - Google Patents

Abstract

The present invention relates to a device for supplying gas to a burner (17) of a cooking appliance comprising, a gas injection means (4), a gas supply tube (5), a burner pot (12) integrated in the hob having an opening (30) for the passage of said gas injection means (4) and support means (1) of said gas injection means (4) .According to the invention, the bore (20) of the support means (1) of said gas injection means (4) is coaxial with the bore (15) of the gas injection means (4), l the axis (14) of the inlet opening (40) of the support means (1) of said injection means (4) is substantially aligned with the axis of the bore (15) of the injection means ( 4), the bore (20) of the support means (1) of said gas injection means (4) opens into said bore (15) of the gas injection means (4) and an opening is arranged to receive by inserting one end of the gas supply tube (5) and a seal (7), fixing sets coaxial with the bore (20) and positioned on the outer contour of the support means (1) of said gas injection means (4) cooperate with said opening (30) of the burner pot (12).

Description

The present invention relates to a gas supply device

  a burner of a cooking appliance.

  It also relates to a method of assembling such a device for supplying gas to a burner, particularly for a hob with a pot burner.

  Cooking appliances such as stoves, hotplates and stoves include at least one burner mounted remote from the control valve and shut off the gas supply. The connection between the burner and the tap is made by a tube.

  The type of gas burner referred to by the invention is commonly called pot burner.

  Conventionally, pot-type burners comprise a recess in the hearth plate forming the pot whose bottom has an opening in which is mounted an injection means connected to the gas supply tube. More specifically, the gas supply tube is connected to the support means of the gas injection means. Inside the pot is assembled a burner body on which a burner cap is placed.

  Usually, pot burners are supported by the pot bottom extending below the hearth plate which can be made for example of enamelled sheet or glass ceramic glass. The pot type burner makes it possible to create a channel between the pot formed in the hearth plate and the burner. This channel allows a primary flow of air in the direction of the injection means to be mixed with the gas leaving said injection means.

  The arrival of the gas in the pot burner is effected by injecting the gas by an injection means supported by a support means for passing through the bottom of the burner pot. The axis of the injector is generally vertical. The feed support means is a metal part comprising an angled injection channel for supplying the gas injection means of the burner. Additional functions are integrated in the support means of said injection means used for the operation of the burner. These additional means such as a spark plug is used to create a spark to ignite the mixture of air and gas located in the combustion chamber of the burner. The complementary means may also consist of a thermocouple associated with the support means of said injection means for detecting the presence of a flame in the burner. In the situation where the flame is extinguished, the gas supply valve is shut off. The support means of said injection means is a voluminous, parallelepipedic piece incorporating many functions. The complexity of this part makes it expensive to achieve it during the molding phase and requires rework by machining.

  In order to allow the mounting of the gas supply means of the burner, it is known to fix the injection means on a molded part and then machined called injector holder. This part belonging to or being integral with the structure of the cooking appliance.

  The means for fixing the support means of said known injection means have disadvantages. Indeed, the support means of said injection means is threaded on its outer part. It also includes a collar bearing on the hearth plate. Then the assembly is fixed by a nut tightening the support means with the hearth plate. This mounting operation is long and not ergonomic for the operator.

  Finally, the support means of said injection means whose gas inlet channel is substantially parallel to the hearth plate is mounted with an angular orientation to allow mounting of the gas supply tube. As a result, the tolerances imposed on the geometry of the feed tube and the support means of said injection means are tight.

  Such burners are known from the published patent application EP1406043A1. In order to respect the alignment tolerance of the axes of the gas inlet channel of the support means of said injection means and of the gas supply tube, it is necessary to impose precise tolerances on the production of the plate. hearth, support means of said injection means and the gas supply tube, which increases the cost of realization of the gas supply assembly of the burner.

  The present invention aims to provide a support means for said injection means at the lowest cost by using just the necessary material and allowing an assembly of the gas supply tube without angular orientation.

  To achieve this object, the invention relates to a device for supplying gas to a burner of a cooking appliance comprising, a gas injection means, a gas supply tube, a burner pot integrated in the hob having an opening for the passage of said gas injection means and a support means for said gas injection means, characterized in that: - the bore of the support means of said injection means gas is coaxial with the bore of the gas injection means; - The axis of the inlet opening of the support means of said injection means is substantially aligned with the axis of the bore of the injection means; the bore of the support means of said gas injection means opens into said bore of the gas injection means and the opening is arranged to receive by insertion one end of the gas supply pipe and a gasket; sealing; - Fixing means coaxial with the bore and positioned on the outer contour of the support means of said gas injection means cooperate with said opening of the burner pot.

  According to another characteristic of the invention, the gas injection means and the support means of said gas injection means form a single piece.

  According to another characteristic of the invention, the support means of said gas injection means is a part of revolution.

  Thus, the invention makes it possible to gain a quantity of material necessary for producing and to save time during assembly of the gas supply device.

  According to a second aspect, the invention relates to a first method of assembling a device for supplying gas to a burner on a cooking appliance according to the invention, in which an opening extends in the cooking plate. the outlet opening facing the gas supply tube, said gas supply tube is fixed on a holding piece, the hearth plate is assembled on the structure of the cooking apparatus and a means for supporting the means Injection molding is fixed by screwing through the hearth plate and the holding part, at the same time, the support means is fitted on the gas supply tube.

  This method of supplying gas to a burner comprises attaching the gas supply tube to a holding piece, assembling the hearth plate to the structure of the cooking apparatus, and attaching the means for supporting the injection means by screwing through the hearth plate and the holding and fitting part of the support means on the gas supply tube.

  Such a method of supplying gas to a burner makes it possible to reduce the cost of producing the assembly and a precise positioning of the injection means with respect to the burner.

  In a second method of assembling the gas supply device of a burner on a cooking appliance according to the invention, in which an opening extends in the hearth plate opening towards the feed tube. gas, the support means of the injection means is positioned through the hearth plate, the gas supply tube is fitted and on the support means and the hearth plate is in position on the structure for close the cooking appliance.

  This method of supplying gas to a burner comprises fixing the means for supporting the injection means through the hearth plate, fitting and fixing the gas supply tube to the support means. and closing the cooking apparatus.

  Such a method of supplying gas to a burner makes it possible to assemble the cooking appliance in reverse, in a simple and economical manner.

  The invention will be better understood and other advantages will appear on reading the description of several embodiments of the invention, illustrated by the appended figures in which: - Figure 1 shows a first embodiment of the invention wherein an injection means is attached to a support means; FIG. 2 represents a second embodiment of the invention in which a support means and an injection means are combined in one and the same piece; - Figure 3 is a sectional view similar to Figure 1 containing complementary elements when they are put in place; FIG. 4 represents a third embodiment in which means for fixing the support means are made by elastic snap-fastening; - Figure 5 shows a fourth embodiment in which a support means is fixed on a cross.

  For a better understanding, the same references designate the same elements in the different figures.

  The gas burner 17 shown in Figure 1 comprises a burner body 10 resting on the pot 12 of a hearth plate 3 and a burner cap 11 placed on the burner body 10. The gas burner 17 is fed gas by an injection means 4 and air from above the hearth plate 3 as illustrated by the arrow 41.

  The injection means 4 is placed under the hole 13 of the burner body 10. The injection means 4 is substantially a piece of revolution of axis 14 having a cylindrical bore 15 also of axis 14 through which the gas arrives in the hole 13 of the burner body 10.

  The gas supply device according to the invention is used to align the axis 14 and the axis 16 of the burner body 10.

  The injection means 4 comprises on its outer part means for attaching to the support means 1. These fastening means comprise an axis threading 14 which is screwed onto a thread formed on the support means 1. This means of 4 injection is removable to allow to adapt the cooking appliance to different combustion gases such as butane gas or natural gas. The injection means 4 and the support means 1 may form a single piece as illustrated in Figure 2 while maintaining the interchangeability of the single piece provided with the injection means 4. This simplification reduces costs obtaining the gas supply device.

  The lower part of the bore 15 of the injection means 4 is opening into the bore 20 of the support means 1. This bore 20 of the support means 1 has an inlet opening 40 for the feed tube 5. gas. This bore 20 of the support means 1 has larger dimensions in most cases to accommodate the gas supply tube 5. The bore 15 of the injection means 4 is coaxial with the bore 20 of the support means 1. In addition, the axis 14 of the inlet opening 40 of the support means 1 of said injection means 4 is substantially aligned with the axis of the bore 15 of the injection means 4. These features make it possible to minimize the amount of material required to obtain this set.

  In addition, the connection of the gas supply tube 5 to the support means 1 of said injection means 4 is simplified. The assembly is achieved by fitting the gas supply tube 5 into the bore 20 of the support means 1 with the insertion of an O-ring 7. The sealing is ensured by the O-ring 7 which is compressed between the outer face of the gas supply pipe 5 and the face of the bore 20 of the support means 1. In order to guarantee the positioning of the O-ring 7, the gas supply tube 5 comprises a collar 32. This collar 32 makes it possible to prevent the removal of the O-ring 7 during the insertion of the gas supply pipe 5 into the bore 20 of the support means 1.

  Advantageously, the bore 20 of the support means 1 comprises a shoulder 42 so as to provide a space in which the O-ring 7 is positioned to improve the seal between the outer face of the gas supply pipe 5 and the face of the bore 20 of the support means 1. The O-ring 7 has an inside diameter close to the diameter of the gas supply pipe 5 and an outside diameter slightly greater than that of the bore 20 of the support means 1 to be tight and to guarantee tightness.

  Means complementary to the operation of the gas burner 17 are no longer carried by the support means 1 such as a thermocouple 8 and a spark plug 9. The complementary means 8 and 9 are not shown in FIG. two components are represented in the form of substantially cylindrical parts and having axes substantially parallel to the axis 14. The axis of the spark plug 9 is designated by the number 19 and that of the thermocouple 8 by the number 18.

  The support means 1 is in the form of a stepped shaft which is also axially 14 following the assembly. The portion of the shaft located below the flange 27 is provided with fixing means. A lower flat face 28 of the flange 27 is supported, when the fastening means of the support means 1 are in the final position of the assembly, against the upper face 29 of the hearth plate 3. The faces 28 and 29 are substantially perpendicular to the axis 14, so that they constitute, when they bear against each other, a relatively precise positioning of the support means 1 relative to the burner body 10 in the direction of axis 14.

  The support means 1 comprises fastening means on its outer face such as for example a thread 31. The support means 1 is screwed into a hole 30 in the pot 12 of the gas burner 17. The hole 30 is substantially the axis 14 so that the support means 1 is centered with respect to the burner body 10. The diameter of the hole 30 is slightly smaller than the diameter of the thread 31 of the support means 1 so that the attachment is assured. Accordingly, the support means 1 is mounted from above the hearth plate 3. The support means 1 and the burner body 10 being positioned relative to the above hearth plate 3. assembly makes it possible to control the offsetting between the axis 16 of the burner body 10 and the axis 14 of the injector 4. In this embodiment, it is necessary to control only the shape and position of the top of the pot 12 of the hearth plate 3 to reduce the manufacturing cost.

  Advantageously, the support means 1 is made of brass to withstand temperature stresses and aggression related to cooking food.

  Another embodiment illustrated in FIG. 4 represents a support means 1 of the injection means 4 similar to that represented in the preceding figures. It comprises means for fixing the support means 1 by resilient latching. The support means 1 comprises a groove 33 below the flange 27. A clip 34 is placed in the groove 33 and abuts on the inner face of the hearth plate 3 to ensure the positioning of the support means 1 .

  The same clip 34 can also be mounted on the thread 31 of the support means 1 to perform the function of holding said support means 1 with respect to the inner face of the hearth plate 3.

  Another embodiment illustrated in Figure 5 shows a gas burner 17 identical to that shown in the previous figures. It comprises means for fixing the support means 1 by screwing on the crosspiece 22. The diameter of the hole 30 of the hearth plate 3 is substantially wider than the diameter of the support means 1 located under the flange 27. The means support 1 has a thread on the portion below the flange 27 to be screwed on the cross member 22 having an opening 38 whose width is substantially smaller. A holding piece 35 of the gas supply tube 5 has for example two lugs 36 and 37. Said two lugs 36, 37 of the holding piece 35 rest on tabs of the crosspiece 22. The holding piece 35 is also provided with an opening for the passage of the gas supply tube 5. The holding piece 35 is positioned below the collar 32 of the gas supply tube 5 preventing the removal of said tube 5 when the holding member 35 is fixed.

  We will now describe a first method of assembling the gas supply device of a gas burner 17 on a cooking appliance according to the invention.

  This assembly is implemented after mounting the gas supply tube 5 on a cross member 22 belonging to or being integral with the structure of the cooking appliance. This assembly is implemented by elastic snapping of a holding piece 35 in two tabs carried by the crosspiece 22.

  The assembly of the gas supply device is preferably implemented after mounting of the gas supply adjustment and shut-off valves not shown in the figures so that the cooking appliance will be closed when the appliance is closed. operator will carry out the mounting of the support means 1 of the injection means 4.

  The cooking apparatus is closed by assembling the hearth plate 3 on the structure of said cooking appliance. This assembly is carried out simply by positioning the hearth plate on the housing of the cooking appliance and then fixing it by known fastening means.

  This method of assembly ensures a more precise positioning of the injection means 4 with respect to the hearth plate 3 because the positioning tolerances are more restricted. As a result, the alignment of the axis 14 of the injection means 4 and the axis 16 of the gas burner 17 is improved.

  During the assembly of the support means 1 of the injection means 4, the seal 7 is positioned in the bore 20 of the support means 1 and abuts against the shoulder 42 of said bore 20.

  Thus, the support means 1 is screwed onto the hearth plate 3 and the cross member 22 as illustrated in FIG. 5 until the bottom face 28 of the flange 27 is blocked on the upper face 29 of the plate. 3. The engagement of the support means 1 in the cooking plate allows the bore 20 of the support means 1 to fit onto the gas supply tube 5.

  Thanks to the invention, a device for supplying gas to a burner of a cooking appliance is thus obtained, enabling an ergonomic assembly for the operator, easy maintenance of the injection means 4 for the after-sales service and then precise positioning of the injection means 4 with respect to the burner 17.

  Thus, this method of assembly makes it possible to mount the support means 1 of the injection means 4 and the injection means 4 without opening the structure of the cooking appliance.

  We will now describe a second method of assembling the gas supply device of a burner on a cooking appliance according to the invention.

  The assembly of the gas supply device is preferably implemented after mounting of the gas supply adjustment and shut-off valves not shown in the figures so that the gas supply tubes 5 will be positioned. when the operator will carry out the mounting of the support means 1 of the injection means 4 on the hearth plate 3. This method of assembly allows a simplified mounting of the support means 1 of the injection means 4. No piece of maintenance is necessary for the assembly of the support means 1. As a result, the cost of performing the function is kept to a minimum.

  During the assembly of the support means 1 of the injection means 4, the seal 7 is positioned in the bore 20 of the support means 1 and abuts against the shoulder 42 of said bore 20.

  The support means 1 is mounted from above on the hearth plate 3 by one of the fixing means described above until the blocking of the lower face 28 of the flange 27 on the upper face 29 of the hearthplate 3 .

  The positioning of a support means 1 is simultaneous with the fixing of said support means 1 on the hearth plate 3.

  Then, the cooking appliance is closed by assembling the hearth plate 3 on the structure of said cooking appliance. This assembly is carried out simply by positioning the hearth plate on the housing of the cooking appliance and then fixing it by known fastening means.

  Thus, the gas supply tube 5 is connected at one of these ends to the medium support bore 1 of the injection means 4 until contact with the collar 32 of the gas supply tube 5 with the base support means 1.

  The attachment of the gas supply tube 5 to a support means 1 allows the attachment of said support means 1 to the hearth plate 3.

  The hearth plate 3 is closed on the structure of the cooking appliance. The gas supply tubes 5 are connected at the other end to the regulating and shutoff valves.

  Thanks to the invention, a device for supplying gas to a burner of a cooking appliance is thus obtained, enabling a simple and economical assembly.

  In particular, the various embodiments have been described in connection with a stove.

  Of course, the present invention is not limited to the embodiments described above.

Claims (20)

-9- CLAIMS   1- A device for supplying gas to a burner (17) of a cooking apparatus comprising, a gas injection means (4) having a bore (15), a tube (5) for supplying gas a burner pot (12) integrated in the hob having an opening (30) for the passage of said gas injection means (4) and a support means (1) for said gas injection means (4); ) having a bore (20) on its inner side, an outer contour on its outer face and a gas supply inlet opening (40), characterized in that: a- the bore (20) of the support (1) of said gas injection means (4) is coaxial with the bore (15) of the gas injection means (4); b- the axis (14) of the inlet opening (40) of the support means (1) of said injection means (4) is substantially aligned with the axis of the bore (15) of the injection means; injection (4); c- the bore (20) of the support means (1) of said gas injection means (4) opens into said bore (15) of the gas injection means (4) and, d- the opening ( 40) is arranged to insertably receive one end of the gas supply tube (5) and a seal (7); e- fixing means (31) coaxial with the bore (20) and positioned on the outer contour of the support means (1) of said gas injection means (4) cooperate with said opening (30) of the pot of the burner (12).   2- Device for supplying gas to a burner according to claim 1, characterized in that the gas injection means (4) and the support means (1) of said gas injection means (4) do not only one piece.   3- Burner gas supply device according to claim 1 or 2, characterized in that the seal (7) is placed between a collar (32) of the tube (5) for supplying gas and the inserted end of said gas supply tube (5).   4- Device for supplying gas to a burner according to any one of claims 1 to 3, characterized in that the bore (20) of the support means (1) of said gas injection means (4) has a shoulder (42) for positioning the seal (7).   5- burner gas supply device according to claim 4, characterized in that a collar (32) is formed near the end of the tube (5) for supplying gas preventing the withdrawal of the gas. bore (20) of the support means (1) of said gas injection means (4).   6- A burner gas supply device according to any one of the preceding claims, characterized in that the support means (1) of said gas injection means (4) is a part of revolution.   7- Burner gas supply device according to claim 6, characterized in that the fastening means (31) coaxial with the bore (20) and the outer contour of the support means (1) of said means injection nozzle (4) is a thread screwed into an opening (30) of the burner pot (12).   8- burner gas supply device according to claim 7, characterized in that a clip (34) engages in a thread of the fixing means (31) of the support means (1) of said means of injection of gas (4).   9- burner gas supply device according to claim 6, characterized in that the fixing means coaxial with the bore (20) and on the outer contour of the support means (1) of said injection means (4) are a groove (33) cooperating with a clip (34) abutting on the hearth plate (3).   10- Device for supplying gas to a burner according to claim 6, characterized in that the support means (1) of said gas injection means (4) is screwed through the burner pot (12) of the cooking plate and a cross member (22) integral with the structure of the cooking appliance.   11- burner gas supply device according to claim 10, characterized in that the cross member (22) has an opening whose dimensions and shape reduce the lateral play of the support means (1) of said means of gas injection (4).   12- Device for supplying gas to a burner according to claim 10 or 11, characterized in that a holding piece (35) has ears (36) and (37) which allows attachment by snap elastic tube (5) gas supply.   13- burner gas supply device according to any one of the preceding claims, characterized in that the support means (1) of said gas injection means (4) is brass.   14-device for supplying gas to a burner according to any one of the preceding claims, characterized in that the seal (7) is an O-ring.   15- A method of assembling a gas supply device of a burner (17) on a cooking apparatus comprising a structure, a hearth plate (3) having an opening (30), (said device comprising a gas supply tube (5), a gas injection means (4) and a support means (1) for said injection means (4), characterized in that it comprises the following steps: fixing the gas supply tube (5) on a crossmember (22), - assembling the hearth plate (3) on the structure of the cooking appliance, - fixing the support means (1) of the medium injection (4) through the hearth plate (3) and a cross member (22) and fitting of the support means (1) on the tube (5) for supplying gas.   16 A method of assembling the gas supply device of a burner on a cooking appliance according to claim 15, characterized in that the fixing of the tube (5) for supplying gas to the crosspiece (22) is ensured. by snap-fastening via a holding piece (35).   17 A method of assembling the gas supply device of a burner on a cooking appliance according to claim 15, characterized in that the fixing of said support means (1) of said injection means (4) on the plate hearth (3) is provided by screwing.   18 A method of assembling the gas supply device of a burner on a cooking appliance comprising a hearth plate (3) having an opening (30), said device comprising a support means (1) of a gas injection means (4) and a gas supply tube (5), characterized in that it comprises the following steps: - positioning of the support means (1) of the injection means (4) at through the hearth plate (3), - fitting and fixing of the gas supply tube (5) on a support means (1), assembly of the hearth plate (3) on the structure of the cooking appliance.   19 A method of assembling the gas supply device of a burner on a cooking appliance according to claim 18, characterized in that the fixing of the tube (5) for supplying gas to said support means (1) allows fixing of said support means (1) on the hearth plate (3).   A method of assembling the gas supply device of a burner on a cooking appliance according to claim 18, characterized in that the positioning of said support means (1) is simultaneous with the fixing of said support means (1). ) on the hearth plate (3).