Device for distributing gas for cooking, with integral taps

063 644 U

DESCRIPTION

Gas distributor for cooking, with integrated taps.

The present invention relates to a gas flow distributor to a domestic cooking appliance, having several rotary type taps integrated in the common distribution tube, for regulating the individual gas flow supplied in an outlet conduit of each faucet.

Prior state of the art

Fuel gas distributors are known for a cooking appliance of the type set out above, such as the one disclosed in WO-9721960, which comprises several taps integrated in the distributor tube, spaced apart, and mounted with means for the hermetic closure of the the tap body insert holes in the pipe.

Each faucet comprises a part of the faucet body provided with a gas passage opening, which is housed within the hollow of the tube for the entry of gas into the faucet, and a rotating conical member inside the body also provided with a passage opening. with a contour of a certain shape, which is overlapped in the direction of rotation with the passage opening in the body of the tap, for the regulation of a variable gas flow "Q". This gas distributor presents the problem that the body of the tap and the regulating member have substantially circular passage openings that cannot regulate more than several constant flow rates "Q", but not an intermediate flow rate "Qgra" proportional to the angular travel of the conical organ. Furthermore, the distribution tube of this known gas distributor has two opposing flat walls for the insertion and exit of the tap body, whereby the sealing of the coupling with the flat tube walls is simple.

Presentation of the invention

The object of the invention is a gas distributor for a domestic cooking appliance, with several regulation taps inserted between the walls of the common distribution pipe, where both the surface of the tap body and that of the rotating conical member have openings for overlapping passages between them, for the regulation of an intermediate flow "Qgra" proportional to the angular travel of the conical member, between two constant flow rates, the maximum "Qmax", and the minimum "Qmin".

The passage openings in the tap body and in the conical member have contours of particular shape as described in detail in the following section, both passage openings formed by area portions adjacent to each other in succession, cooperating by means of their overlap in the direction of rotation to achieve said three flow rates, the intermediate flow rate "Qgra" also being linearly variable.

Furthermore, in order to use a cylindrical tube for the assembly of the distributor, the invention solves the problem of the coupling between the body of the tap and the cylindrical tube, by means of a tight closure of both insertion holes of the tap body, which are not planes but have the geometric profile of the orthogonal intersection of two cylinders. Description of the drawings

Fig. 1 is a sectional view of a cooking gas distributor with the taps integrated in the distribution tube.

Fig. 2 is a disassembled perspective view of the gas distributor of Fig. 1, showing each part in its relative mounting position.

Fig. 3 is a profile view of a conical regulating member of the tap of the gas distributor of Figs. 1 and 2.

Fig. 4 is a perspective view of a tap body of the gas distributor of Figs. 1 and 2.

Fig. 5 is a view of the tap body of Fig. 4, showing its developed surface with a regulation groove.

Detailed description of the invention

With reference to Figs. 1-5, an embodiment of the gas distributor 1 comprises an elongated, preferably cylindrical gas distribution tube 2, of the type that is connected at one end to a gas source of a domestic cooking appliance, and several rotary taps 3 integrated in the distribution tube 2 spaced apart, for the individual supply of a gas flow "Q" to a corresponding burner.

Each tap 3 comprises a tap body 4 and an internal regulating member 5 of the conical type, the part of the body 4a that cooperates in regulating the gas flow "Q" housed inside the tube 2. The gas supplied by the source circulates through the inlet hole 2b in the tube 2, and enters the tap 3 first through a regulation slot 11 in the surface of the body 4a, and then through a rotary passage opening 12 towards the interior of the conical member 5, from where it is led to an outlet conduit 3b in the body of the tap. Already outside the distribution tube 2, a nozzle 8 is screwed to the outlet end 4c of the tap, for injecting the regulated flow "Q" into the mixing inlet of the corresponding burner.

The flow of gas "Q" circulating through the tube 2 is distributed among the various integrated taps 3, each one of them being able to supply by rotating the axis 6 of the tap, in this order a maximum flow Qmax, an intermediate flow Qgra , and a minimum flow rate Qmin (Fig. 5).

The conical member 5 is attached to the drive shaft 6, and the coupling of both to the body of the tap 4 is covered by a cover 7, which guides the rotation of the shaft 6, between two stops with an angular path of 210 degrees (Fig . 5). The conical member 5 is positioned inside the body 4 biased by a spring 24, and is driven by the axis 6 in its rotation by means of a flange 26 on the axis that engages with a recess 25 in the conical member. The passage opening 12 of the conical member runs through the immobile elongated slot 11 in the wall 4a of the body, between two angular positions P0-P3 relative to the body 4, to supply said flow rates Qmax, Qgra, and Qmin.

The body 4 of the tap 3 comprises three substantially cylindrical body parts 4a, 4b, 4c, of different diameters forming sections 9,10 in the axial direction towards the tube 2, the intermediate part 4a forming a cylindrical wall 4a of the Immovable regulating slot 11, which is inserted into the hollow of the tube 2b through a hole 13 in the cylindrical wall of the tube 2a. This intermediate part of the body 4a has an internal hollow machined with a conical surface 40, inside which the conical member 5 pushed by the spring 24 fits.

The first part 4b of larger diameter lies outside the tube 2, and forms a cross section 9 as an insert stop in the tube 2, from which two arcuate lobes 15 with an edge protrude axially

ES 1 063 644 U transverse surrounding the hole 13 in the cylindrical wall of the tube 2a, the shape of which follows the geometric intersection line with a cylinder, thus facilitating its orthogonal coupling to the cylindrical wall of the tube 2a. On said transverse edge of these lobes 15 there is interposed with the cylindrical wall of the tube 2, a sealing gasket 22 in a specific shape, surrounding the hole 13 in the tube traversed by the body 4, for its watertight closure. The sealing gasket 22 has on one of its faces a recess configured with a geometric surface equivalent to the intersection of two cylinders of different diameter, that of the intermediate part 4a of the inserted body, and that of the tube 2, and on the other face it has a flat surface for its tightening against said also flat cross section 9. For positioning and guiding the tap cover 7, the outer body part 4b has two pairs of peripheral ribs 27 opposed to each other, in which a respective flange of the cover 7 is hooked.

The end part 4c of the body is an end of the body 16 with external thread, for fixing said injector nozzle 8 outside the tube 2. The end of the body 16 forms a second cross section 10 in the body, remaining inside the inlet hole. 2b of the gas, from which an outlet conduit 3b of the flow tap "Q" is formed that protrudes from the tube 2 for fixing the nozzle 8. The latter comprises a nut 17 for its coupling to the cylindrical wall of the tube 2, and an injector hole 18 at the free end, to feed the fuel mixture intake into the corresponding burner. Between the tube 2 and the nut 17 of the nozzle, an adapter sleeve 19 and a sealing gasket 23 (Fig. 2) are mounted, the shapes of which are adapted for closing against the cylindrical wall of the tube 2. The adapter sleeve 19 has on the side of the coupling to the tube 2, a cylindrical surface 20, preferably recessed, into which the seal 23 fits in shape, and on the opposite side the surface 21 of the adapter sleeve 19 is flat. , in order to make a uniform clamping contact against the flat surface 17 on the nozzle. The seal 23 has a curved recess surface, geometrically adapted to the intersection of the cylindrical body 4 with the hole 14 in the tube 2, also cylindrical. The adapter sleeve 19 can also have a different shape than that described, for example with the curved face 20 in the form of a hemispherical lobe, which enters the central hole of the seal 23, pressing it uniformly against the hole 14 in the tube 2 .

Referring to Figs. 4, 5, the regulating groove 11 in the body wall 4a is immobile, and has a contour formed by two passage areas 11a and 11b different from each other. A large passage area 11a regulates the flow "Qmax", being approximately rectangular in shape with two opposite rounded sides to facilitate machining, for example length "Xm" around 3 mm and height "H" around 6 mm , also facilitating the adjustment of the relative position between both conical surfaces 40,50. Following the passage area 11a of large size for the Qmax, an adjacent convergent slot 11b is formed, the passage area 11b of which is narrow and long extending in the direction of rotation "R" of the conical member 5, thereby regulating linearly the intermediate flow Qgra. The wide end of the converging groove 11b has a dimension of about 1.1 mm, and the length "Xg" of the converging groove 11b, for example 15 mm, equates to an angular travel of approximately 160 degrees. The end of the converging slot 11b provides the minimum flow rate Qmin.

With reference to Fig. 3, the conical regulating member 5 comprises said passage opening 12 that overlaps in its rotation on the regulating groove in the wall 4a of the body. This passage opening has a particular contour that cooperates in the regulation of the different flow rates "Q" supplied by the tap 3. The passage opening 12 comprises two passage area portions 12a, 12b adjacent one to the other, for their overlap. over the through groove 11 in the wall 4a of the body. A passage area 12a in the conical member 5 is circular in shape, for example of diameter 1.8 mm, for the passage of the Qmax, which is positioned to be able to overlap only under said wide passage opening 11a in the wall 4a of the body. Next, a narrow passage area 12b of a substantially rectangular shape in the conical member 5 (Fig. 3), has an extension "E" around 2 mm for example, and a width "W" around

I mm, it is interposed only under the convergent groove 11b in the wall 4a of the body, providing during its rotation an intermediate flow Qgra, which is gradually decreasing as a function of the rotated angle, until its final relative position P3, in which it supplies the Qmin . The extension "E" of the passage area 12b in the conical member 5 is sufficiently wide to cover the maximum width - 1.1 mm - of the stationary convergent groove 11b in the body 4.

With reference to Figures 4 and 5, the passage opening 12 in the conical member 5 occupies several defined positions P0-P3 in relation to the adjustment slot

II immobile on the 4th wall of the body. In an initial position P0, the opening 12 is away from the regulation slot 11, and corresponds to the "OFF" closure of the tap. Following the direction of rotation "R" of the conical member, and after an angle of 90 degrees corresponding to the position P1, both areas 12a, 12b of the passage opening entirely overlap under the large area 11a in the wall 4a of the body, the maximum flow rate Qmax being abruptly established in the outlet duct 3b. Continuing the rotation "R", the passage opening 12 successively occupies continuous intermediate positions P2, which provide an intermediate flow Qgra, which is thus linearly regulated due to the gradually decreasing section of the stationary convergent slot 11b. In a final position P3 of the passage opening 12, the conical member encounters a stop that prevents its subsequent rotation in the direction "R", and here in the final stop position P3, the conical member 5 having made the closing "OFF" a total angular travel "St" equivalent for example to 270 degrees from the position P0 of the closure "OFF", a constant minimum flow Qmin is conducted to the outlet conduit 3b. In the successive intermediate positions P2 of linear regulation of the Qgra, and in the final position P3, only the narrow area 12b of the passage opening in the conical member, is interposed under the immobile convergent groove 11b.