Atmospheric burner in particular for frying devices and shell-and-tube exchangers

Description

[0001] The present invention relates to a gas burner, in particular a gas burner for frying devices and shell-and-tube exchangers of the type wherein the flame generating head is formed by a shaped chamber comprising an initial part wherein arrives the feeding conduit of the air/gas fuel mixture. Such initial part is suitably broadened and its upper portion is joined to a further terminal portion having a reduced and gradually decreasing thickness.

[0002] A thin wire mesh is disposed in the upper and essentially planar surface of said chamber. The wire mesh is covered with a suitable sheet of metal equipped with a suited plurality of transversal slits which extend over the zone covering the relative terminal portion with reduced thickness. The fuel mixture passes through the slits and , when it is suitably ignited , it generates a relative plurality of flames.

[0003] Various kinds of gas burners are already known for example from DE-A-1 529 164. The known atmospheric burners which have been designed and realized for the same utilization and application of the burner forming the object of the invention present some restrictions and drawbacks.

[0004] As disclosed in the italian patent N. 114847 of the same applicant , the generated power is small with respect to the overall size of the burner's body. Moreover, the known burners cause detachment of the flame and/or backfire as well as troubles of resonance which compromise the performances of the burner.

[0005] One object of the present invention is to overcome the above stated restrictions and drawbacks by means of a particular and characterizing conformation of the flame generating head which is used in the burner object of the invention.

[0006] In order to better understand the features and the advantages attainable by the burner according to the present invention, this burner is hereinafter described, by way of a not limitative example only, and with reference to the accompanying drawings , wherein:

• the Figure 1 is a partially broken side-view of the burner according to the present invention;
• the Figure 2 is a plan view of the burner shown in the Figure 1;
• the Figure 3 is a sectional view, on a suitable larger scale, taken along the section plane I - I in Figure 1;
• the Figure 4 is a perspective view of the burner'head taken from the part generating the flames and
• the Figure 5 is an exploded view in perspective of the basic parts of the head shown in Figure 4.

[0007] In such Figures the common items are marked with the same reference numerals. Moreover, it is to be noticed that an element of the burner's head of the Figure 2 is partially broken away for clarity reasons.

[0008] Referring to the above-mentioned drawings and with particular reference to Figures 1 and 2, it will be seen that the burner in question is essentially made up of an air/gas mixture generator 1 of a known type that is customarily used in the gas burners of atmospheric type. The air/gas mixture generator 1 feeds a head 2 for generating the flames F.

[0009] In addition to the Figure 1 and 2, the Figure 3, 4 and 5 show in more details the characterizing conformation of such head 2 .

[0010] Even though the air/gas mixture generator 1 is of known type, it will be synthetically described in order to better understand the functioning of the whole burner.

[0011] As it can be seen from the drawings and more particularly from the Figures 1 and 2, the generator 1 is made up of a suitable Venturi tube 11.

[0012] A suitable feeding group 12 injectes the necessary air/gas fuel mixture in the outer end of the Venturi tube, that is to say that one of smaller diameter

[0013] Even though the composition and the functioning of the feeding groupl2 are of known type, they will be hereinafter described for clarity reasons.

[0014] Referring again to the Figures 1 and 2 it will be seen that said feeding group 12 is formed by a nozzle ( not shown ). The nozzle is applied to a suitable supporting element 13 which is fixed to the said outer end of the Venturi tube 11.

[0015] Such nozzle is disposed coaxially to said Venturi tube 11 as well as positioned at a suitable distance from the relative outer end of the same.

[0016] Moreover, an adjusting bush 14 is inserted in the said outer end of the Venturi tube 11 and is longitudinally slidable in the same Venturi tube 11.

[0017] Therefore, when the gas fuels the nozzle, this last will eject gas through its exit hole turned towards the end of the bush 14 which is protruding out of the outer end of the Venturi tube 11.

[0018] As it is known, the gas ejected by the nozzle sucks a suitable quantity of air, named "primary air". The jet of air/gas fuel mixture enters the said adjusting bush 14 and, then, it passes through the adjacent Venturi tube 11. The air/gas fuel mixture goes out of the Venturi tube 11 through the opposite end, that one presenting the larger diameter, and feeds the said head 2 for generating the flames F.

[0019] Incidentally, it is to be pointed out that the flow rate of the primary air can be adjusted by varying the position of the said adjusting bush 14 in such a way as to obtain an optimal stoichiometric ratio of the air/gas mixture with respect to the various families of the used gases.

[0020] After the description of the air/gas fuel mixture generator 1 which is used for feeding the head 2, it is now described the latter 2.

[0021] With reference to the figures 1 and 2 which are showing the whole burner and also to the figures 3, 4 and 5 which are particularly showing the entirety as well as the composition of the head 2 , it is to be noticed that the head 2 is constituted by a tank-shaped casing 20 which is formed by a sheet of metal. The peripheral rim of the upper and open part of the casing 20 is disposed on an horizontal plane which is parallel to the axis of the Venturi tube 11 in the generator 1.

[0022] Now, it is described the particular shape of such casing 20.

[0023] As it can be seen in particular from the figures 1 and 5, the casing 20 comprises a peripheral wall and a bottom wall which are suitably shaped in the hereinafter described way.

[0024] The peripheral wall is constituted by a vertical, flat and essentially square wall 21 which is centrally provided with a hole wherein is inserted the greater end of the Venturi tube 11 This latter is orthogonally fixed to the wall 21 by welding.

[0025] Moreover, the sides of such vertical flat wall 21 have dimensions which are slightly larger than the diameter of the portion of the Venturi tube which is fixed to the wall.

[0026] Two fair flat lengths 22 are departing from the sides of such vertical wall 21 and are symmetrically diverging outwards as well as towards the direction which is opposite to the departing direction of the Venturi tube. The lengths 22 join two further curved lengths 23 which are convex outwards. The lengths 23 are joined to short curved lengths 24 which are convex in the opposite direction. The lengths 24 are joined to two lateral and flat walls 25 which are symmetrically parallel to each other as well as mutually spaced at a distance which is not much greater than the transversal width of the said vertical flat wall 21. Finally, the walls 25 are terminating, at their ends, with a length of semicircular wall 26.

[0027] As above described, the contour of the peripheral wall is constituted by lengths of wall 21-22-23-24-25-26 which are extending in vertical direction.

[0028] However, the height of the said peripheral wall varies only with respect to the contour of the bottom wall because the contour of the open portion of the casing 20 is disposed on a horizontal plane.

[0029] Now, it will be hereinafter described the contour of the bottom wall.

[0030] The bottom wall crosses the peripheral wall and generates a particularly shaped space in the casing 20.

[0031] With particular reference to the Figure 1, it can be seen that such bottom wall includes a first flat length 27 which is orthogonally departing from the lower edge of the vertical flat wall 21 and it is extending in parallel to the opposite compound wall P.

[0032] The first length 27 delimites a space having a height that is approximately equal to the height of the said flat wall 21. Moreover, the said first length 27 is extending for a length which is approximately equal to the height of the relative space and it is going as far as the beginning of the lateral flat walls 25 where it joins to a second flat length 28.

[0033] The second flat length 28 is inclined upwards at an angle of approximately 45° and it is extending as far as around 2/3 of the height of the previous space. Then, the second flat length 28 joins to a third flat length 29 which is slightly inclined upwards and its end terminates near the peripheral rim of the upper open portion.

[0034] As it can be seen from the Figures 1 and 3 , a lip L is orthogonally departing from the peripheral rim of the upper open portion of the above-described casing 20. The lip L is peripherally bent inwards with a relative portion L1 in such a way as to vice a compound wall P which is closing the upper open portion of the casing 20.

[0035] As it can be seen in particular from the Figure 5, such compound wall is formed by a metallic wire mesh R , which is disposed in the part turned towards the inside of the casing 20, and by a diaphragm D which is formed by a sheet of metal and is disposed outside and upon the said wire mesh R.

[0036] The said diaphragm D is provided with two raws of rectangular slits A which are extending for about 2/3 of its length and are disposed in the part of the diaphragm which is turned towards the end that is opposite to the end wherein the relative head 2 is connected to the Venturi tube 11.

[0037] The slits A are disposed symmetrically as well as orthogonally with respect to the longitudinal axis of the diaphragm and present a width of about 1 mm. Moreover, the slits are mutually spaced at a distance which is not much greater than their width, namely of about 1,5 mm..The inner ends of the slits are mutually and fairly spaced as well as symmetrically aligned with the sides of the longitudinal axis of the relative diaphragm D. The slits extend as far as their outer ends are near the inner part of the rim in the corresponding upper portion of the casing 20.

[0038] As it can be seen from the Figures 1 and 3 as well as from the Figures 4 and 5, the portion of the compound wall P, wherein the said slits A are made in the relative diaphragm D, is shaped as a concave surface.

[0039] The relative two parts of wall P, whereon the symmetrical raws of slits A are realized, practically and fairly following inclined and convergent directions towards the inside of the underneath space delimited by the casing 20.

[0040] Finally, it is to be pointed out that relative small incisions C are made in the said head 2 for the reasons hereinafter described. The incisions C are forming relative narrow slits which are extending as far as to penetrate in the inside of the head 2.. The said incisions C are made on each lateral and symmetrically parallel lengths of the protruding edge formed by the lip L which is clamping the perimeter of the compound wall P by means of its bent portion L1.

[0041] From what described it is clear that the inner space of the head 2 presents four zones having respective different cross-sections which are variable in their shapes and in their dimensions.

[0042] Now, the above-mentioned four zones will be hereinafter described beginning from the end wherein the said head 2 is connected to the Venturi tube.

[0043] A first and a second zone are comprised between the first flat length 27 of the bottom wall and the opposite initial length of the compound wall P. Such lengths are parallel to each other, therefore they have respective cross-sections which vary as a consequence of the contour of the respective portions of the peripheral wall.

[0044] A first zone is departing from the vertical wall 21 and is extending as far as the central part of the curved lengths 23. Such first zone presents a gradually increasing cross-section because it is laterally delimited by the flat and mutually diverging lengths 22 and by a half of the adjacent lengths 23 which are convex outwards.

[0045] The following second zone presents a gradually decreasing cross-section because it is laterally delimited by the successive half of the curved lengths 23 and by the short curved lengths 24.

[0046] The third zone presents a rapidly decreasing cross-section because it is laterally delimited by respective parts of the flat and mutually parallel walls 25 in its upper part by the compound wall P and, in its lower part by the second flat length 28 which is extending towards the opposite compound wall P and following a very inclined direction.

[0047] Finally, the fourth zone is that one terminating in the end opposite to that one connected to the Venturi tube and it presents a gradually and slightly decreasing cross-section. Such fourth zone is laterally delimited by respective parts of the flat and parallel walls 25 as well as, in its end, by the length of semicircular wall 26 to which the said flat walls 25 are joined. In its upper part, the fourth zone is delimited by the compound wall P while in its lower part it is delimited by the third flat length 29 which is departing from the upper end of the previous second flat length 28. The third flat length 29 is extending towards the end of the head 2 and it is following a slightly inclined direction.

[0048] After the description of the characterizing shape of the head 2, it is now described the working of the whole burner forming the object of the present invention.

[0049] The fuel air/gas mixture, which is generated, as above described, in the feeding group 12 disposed in the outer end of the Venturi tube 11, is injected in the Venturi tube I 1 and flows through the inside of the head 2. In the said first zone, the fuel mixture is subjected to a suitable expansion followed, in the second zone, by a fair contraction.

[0050] Such initial expansionary and contractionary phases are suited to allow a uniform distribution of the fuel mixture at the end of the second zone. Therefore, the air/gas fuel mixture will be able to feed the successive third and fourth zones in a uniformly distributed manner.

[0051] In the third zone, the air/gas fuel mixture meets the said second flat length 28 which is inclined upwards. Then, the fuel mixture is rapidly deviated towards the compound wall P and it meets such compound wall P in a first portion of the length provided with the said slits A

[0052] A part of the fuel mixture goes out through the slits while the remaining part of the fuel mixture flows through the said fourth zone wherein it meets the said fourth flat and slightly inclined length 29. Then, the rest of the fuel mixture is progressively deviated towards the compound wall P in the successive portion of the length provided with the slits A and finally, it goes out completely through the slits A.

[0053] Only a very small quantity of fuel mixture goes out through the small incisions C which are made, as already described, on both sides of such fourth zone.

[0054] The particular and above described shape of the inner space of the head 2 allows to obtain a uniform release of air/gas fuel mixture through the relative slits A and, upon ignition, a uniform distribution of a corresponding plurality of flames F.

[0055] On the other hand, the part of the compound wall P , whereon the slits A are made, has a concave shape. More precisely, it is shaped in such a way as the respective parts, whereon the two symmetrical raws of slits A are made, result inclined and convergent towards the inner space of the head 2. Consequently, also the relative slits A result so inclined and convergent that the respective raws of flames F, which are generated by the burner, follow convergent directions as it can be seen from the Figure 3.

[0056] Clearly, the convergence of the flames F allows to obtain a suitable concentration of the flames that is very useful and convenient for the particular utilizations of the burner forming the object of the present invention.

[0057] At this point, it is convenient to state the particular function of the metallic wire mesh R that, as already described, constitutes one of the two parts of the compound wall P.

[0058] The disposition of the wire mesh before the slits A realized in the diaphragm D forces the air/gas fuel mixture to go through the metallic wire mesh R before going outside through such slits A and that allows to uniform the distribution and to avoid the backfires tanks to the same phisical principle whereon are based the known safety lamps called Davy lamps. In coal mining, such lamps are used in atmospheres which may contain the firedamp or grisù in order to prevent the ignition of this dangerous flammable gas.

[0059] Finally, it is to be pointed out that the small incisions C, which are made on the sides of the head as above described, emit relative small flames F1 as it can be seen from the Figure 2. Such small flames allows the serial ignition of groups of burners which are disposed side by side and parallel to each other.

[0060] In conclusion, the above described burner forming the object of the present invention not only allows to avoid the faults and the drawbacks of the known burners which are used for the same applications and utilizations but it also allows to obtain various and considerable advantages in comparison with the known burners.

[0061] With the burner forming the object of the invention it will be possible to avoid all the troubles of resonance, of detachment of the flame and/or of backfire which occur in the other known burners. Moreover, the burner forming the object of the invention does not require conduits or other kinds of canalizations which are normally used in the known burners for introducing secondary air over the burner flame.

[0062] Consequently, the burner forming the object of the present invention allows to increase the specific load. Therefore, it results more compact and it generates an higher maximum power rating value.

[0063] Finally, the burner forming the object of the invention allows an high operational flexibility and therefore it offers a wide possibility to vary the power which is released in the whole relative field of utilization with a perfect combustion and an ideal efficiency.

Claims

1. Atmospheric gas burner in particular for frying devices and shell-and-tube exchangers, such burner being essentially formed by an air/gas mixture generator ( 1 ), of a known type that is normally used in the gas burners of atmospheric type, such generator is feeding a particular head ( 2 ) for generating the flames ( F ), said head ( 2 ) having a particular shape and being constituted by a casing ( 20 ) which is formed by a sheet of metal, such casing being symmetrically extending with respect to the vertical plane which is lying along its longitudinal axis as well as aligned with the axis of a Venturi tube ( 11 ) of the generator ( 1 ) which is feeding said head ( 2 ), the peripheral rim of the upper and open portion of the casing ( 20 ) being disposed on an horizontal plane which is parallel to the axis of the Venturi tube ( 11 ) such burner being characterized in that, the inner space of the said casing ( 20 ) is delimited by a peripheral wall, which is vertically extending along a contour that is symmetrical with respect to its longitudinal axis, and by a bottom wall which is intersecting the said peripheral wall by means of lengths which are departing from the feeding end and are progressively converging towards the open upper portion of the said casing, such open upper portion of the said casing ( 20 ) being moreover closed by a compound wall ( P ) which is suitably fixed on its peripheral rim, such compound wall ( P ) being formed by a metallic wire mesh ( R ) which is externally covered with a metallic diaphragm ( D ) formed by a sheet of metal and provided with suited slits ( A ), the air/gas fuel mixture which is feeding said head ( 2 ) goes out through the said slits and generates respective flames ( F ), finally, relative small incisions ( C ) are made on the sides of the head ( 2 ), they penetrate in the inner space of the head ( 2 ) and they emit respective small lateral flames ( F1 ) which are suited to allow the serial ignition of groups of bumers which are disposed side by side and their longitudinal axes are parallel to each other.

2. Burner according to the claim 1 characterized in that the said peripheral wall of the casing ( 20 ) comprises a vertical, flat and essentially square wall ( 21 ) which is centrally provided with a hole wherein is inserted the end of the Venturi tube ( 11 ) which is orthogonally fixed to the same wall ( 21 ); two flat lengths ( 22 ) are departing from the sides of such vertical wall ( 21 ) and are symmetrically diverging outwards as well as towards the direction which is opposite to the departing direction of the Venturi tube; the lengths ( 22 ) join two curved lengths ( 23 ) which are convex outwards ; the lengths ( 23 ) are joined to further curved lengths ( 24 ) which are convex in the opposite direction; the lengths ( 24 ) are joined to two lateral and flat walls ( 25 ) which are symmetrically parallel to each other as well as mutually spaced at a distance which is not much greater than the transversal width of the said vertical flat wall ( 21 ); the walls 25 are finally terminating , at their ends, with a length of semicircular wall ( 26 ); a lip ( L ) is orthogonally departing outwards from the upper rim of the said peripheral wall, the lip ( L ) is peripherally bent inwards with a portion ( L1 ) in such a way as to vice the peripheral edge of the said compound wall ( P ) and to fix hermetically the compound wall ( P ) to the said upper rim of the peripheral wall.

3. Burner as in any of the preceeding claims , characterized in that the said bottom wall of the casing ( 20 ) includes a first length ( 27 ) which is orthogonally departing from the lower edge of the said vertical flat wall ( 21 ) and, therefore, it is extending in parallel to the opposite compound wall ( P ); the first length ( 27 ) delimites a space having a height that is approximately equal to the height of the said flat wall ( 21 ) , the said first length ( 27 ) is moreover extending for a length which is approximately equal to the height of the relative space and it is going as far as the beginning of the lateral flat walls ( 25 ) where it joins to a second flat length ( 28 ), the second flat length ( 28 ) is inclined upwards at an angle of approximately 45° and it is extending as far as around 2/3 of the height of the previous space, the second flat length ( 28 ), in its turn, joins to a third flat length ( 29 ) which is slightly inclined upwards and its end terminates near the peripheral rim of the upper open portion.

4. Burner as in any of the preceeding claims , characterized in that the slits ( A ) on the said diaphragm ( D ) of the compound wall ( P ) are disposed in the ending part of the said diaphragm ( D ) and are extending for about 2/3 of the length of the same diaphragm ( D ), such slits ( A ) are arranged in two raws wherein the slits are disposed symmetrically as well as orthogonally with respect to the longitudinal axis of the relative diaphragm ( D ) in such a way as their inner ends are mutually and fairly spaced as well as symmetrically aligned with the sides of such longitudinal axis while their respective outer ends are near the inner part of the upper edge of the relative portion of the peripheral wall of the casing ( 20 ).

5. Burner as in claim 4, characterized in that the said slits ( A ) present a rectangular shape having a width of about 1 mm. and are mutually spaced, along the respective raws, at a distance which is not much greater than their width, namely of about 1,5 mm..

6. Burner as in any of the preceeding claims, characterized in that the portion of the compound wall ( P ), wherein the said slits ( A are made in the relative diaphragm ( D ), is shaped as a concave surface, the concavity being defined by the fact that the two parts of wall ( P ), whereon two symmetrical raws of slits ( A ) are realized, are following fairly inclined and convergent directions towards the inside of the underneath space delimited by the casing ( 20 ) and therefore also the relative slits ( A ) are inclined in the same way and generate respective raws of flames ( F ) which are oriented in convergent directions.

7. Burner as any of the preceeding claims, characterized in that the shape of the inner space of the head ( 2 ) ,which is obtained from the particulars conformations of the peripheral and bottom walls of the relative casing ( 20 ) and of the compound wall ( P ), is suited to allow at first a uniform distribution of the air/gas fuel mixture which is feeding the head ( 2 ), then, to deviate the fuel mixture towards the zone of the compound wall ( P ) which is provided with the slits ( A ) and to release uniformly the fuel mixture through the slits for generating , upon ignition, raws of uniformly distributed flames ( F ), finally, the presence of the metallic wire mesh ( R ), which is placed on the inner side of the said slits ( A ), produces a consequent passage of the air/gas fuel mixture through the fine spun of the wire mesh, helps to uniform the distribution of the air/gas fuel-mixture and, moreover, prevents any backfire for the grounds of a known phisical principle.

Ansprüche

1. Atmosphärischer Gasbrenner insbesondere bei Friteusen und Wärmeaustauscherrohren verwendbar. Dieser Brenner besteht im wesentlichen aus einem Gasluftgemischgenerator (1), der normalerweise bei atmosphärischen Gasbrennern Verwendung findet und speist einen flammenerzeugenden (F) Spezialkopf (2). Dieser Kopf (2) besitzt eine einzigartige Form und ist mit einer Blechhülse (20) versehen, die sich gegenüber der vertikalen Sektion symmetrisch ausdehnt, der Längsachse des Brenners entlanggeht. Gleichzeitig reiht sich die Hülse an die Achse eines Venturirohres (11) des Generators (1) an, der den genannten Kopf (2) speist. Der Außenrand der entsprechenden offenen Oberseite des Kopfes ist, auf der Horizontalprojektion, parallel zu der Achse des genannten Venturirohres (11) angeordnet. Der Innenraum der genannten Hülse (20) ist von einer Außenwand, die sich senkrecht längs eines symmetrischen Profils, gegenüber der Laängsachse des Brenners entwickelt und von einer Grundwand definiert, die die genannte Außenwand mit Teilen überschneidet, die vom Endstück der Zuführung ausgehen und fortlaufend nach der offenen Oberseite der genannten Hülse zusammenlaufen. Diese offene Oberseite der genannten Hülse (20) ist mit einer aus verschiedenen Teilen zusammengesetzten Wand (P) geschlossen, die zweckmäßig an Ihrer Außenwand befestigt ist. Diese aus verschiedenen Teilen zusammengesetze Wand (P) besteht aus einem Metallsieb (R), und ist von außen durch eine Membran (D) aus geeignetem Blech überdeckt und mit entsprechenden Schlitzen (A) versehen. Aus diesen Schlitzen kann das Gasluftgemisch durchfließen, das den genannten Kopf (2) speist und die jeweiligen Flammen (F) erzeugt. Zuletzt an den Seiten des genannten Kopfes (2) sind ziehmlich kleine Einschnitte (C) verarbeitet worden, die in seinen Innenraum eindringen und jeweils kleine Seitenflammen (F1) erzeugen. Diese Einschnitte ermöglichen die serienmäßige Zündung der seitlich gestellten Gruppe von Brennern, die parallel zu Ihrer Längsachse angeordnet sind.

2. Laut Anspruch 1, besteht das Merkmal des Brenners darin, dass die genannte Außenwand der Hülse (20) zuerst eine senkrechte, kleine Flachwand (21) umfasst, die im wesentlichen rechteckig und in der Mitte mit einer Bohrung versehen ist, in die der äußerste Teil des Venturirohres (11) eingefügt und an die Wand selbst (21) rechtwinkelig befestigt wird. Aus den Seiten dieser senkrechten, kleinen Flachwand (21) entspringen zwei flache Teile (22), die sich voneinander symmetrisch verbreiten und sich gleichzeitig an die gegenüberliegende Seite des genannten Venturirohres richten, und sich wieder in zwei Teile (23) vereinen, die konvex gewölbt nach außen gerichtet mit weiteren konvex- gewölbten Teilen (24), in entgegengestzter Richtung in zwei seitliche flache Wände (25) verbinden. Diese Wände (25) laufen untereinander symmetrisch und parallel und der Abstand untereinander ist etwas länger als die trasversale Breite der genannten, senkrechten, kleinen Flachwand (21). Diese zwei flachen Teile (25) enden in einen halbkreisförmigen Teil der Wand (26). Vom oberen Rand der genannten Außenwand entspringt zuletzt rechtwinckelig nach außen eine Lippe (L), die am Rand mit einem Teil (L1) nach innen gebogen ist und somit den äußersten Rand der genannten, zusammengestzten Wand (P) zusammenklemmt und dadurch hermetisch abschließt.

3. Laut der vorherigen Ansprüche, besteht das Merkmal dieses Brenners darin, dass die genannte Unterwand der Hülse (20) aus einem ersten Wandteil (27) besteht, der rechtwinkelig vom unteren Rand der genannten, senkrechten, kleinen Flachwand (21) ausgeht und somit parallel zu der gegenüberstehenden aus verschiedenen Teilen zusammengestzten Wand (P) einen Raum bildet, der ungefähr gleich hoch ist wie die kleine Flachwand 21. Der erste genannte Wandteil 27 ist ungefähr gleich lang wie die Höhe des entsprechenden Raumes und endet praktisch am Anfang der seitlichen Flachwände (25), wo er sich mit einem zweiten Flachwandteil (28) verbindet und dieser zweite Wandteil richtet sich ungefähr 45° schräg nach oben und breitet sich bis ungefähr 2/3 der Höhe des vorherigen Raumes aus. Dieser zweite Wandteil verbindet sich mit einem weiteren dritten Flachwanteil (29), der auch nur leicht schräg gegen oben gerichtet ist und dessen Endstück in der Nähe vom Außenrand der oben offenen Seite endet.

4. Laut der vorherigen Ansprüche, besteht das Merkmal dieses Brenners darin, dass die auf der Membran (D) der mehrschichtigen Wand (P) befindlichen Schlitze (A) am Endstück der genannten Membran (D) angeordnet sind und sich mit einem Ausmaß von ungefähr 2/3 der Länge der Membran (D) selbst ausbreiten. Diese Schlitze (A) sind außerdem in zwei Reihen geteilt und sind symmetrisch und gleichzeitig rechtwinkelig gegenüber der Längsachse der entsprechenden Membran (D) angeordnet, sodass die internen Endstücke der Schlitze ziemlich untereinander distanziert und symmetrisch an den Seiten dieser Längsachse aufgereiht sind; während die entsprechenden äußeren Endstücke sich in der Nähe der Innerseite des oberen Randes des entsprechenden Teiles der Außenwand der Hülse (20) befinden.

5. Laut Anspruch 4, besteht das Merkmal dieses Brenners darin, dass die genannten Schlitze (A) eine rechteckige Form aufweisen, deren Breite sich auf ungefähr 1 mm beschränkt. Der Abstand zwischen den Schlitzreihen ist etwas höher als Ihre Breite und zwar von ungefähr 1,5 mm.

6. Laut der vorherigen Ansprüche, besteht das Merkmal darin, dass ein Teil der mehrschichtigen Wand (P), wo sich die entsprechende Membran (D) mit den Schlitzen (A) befindet, konkav ist. Die Wölbung entsteht dadurch, dass die zwei Wandteile (P), wo sich die zwei symmetrisch angeordneten Schlitzreihen (A) befinden, ziemlich schräg gegen den unteren Raum der Hülse (20) zusammenlaufen und deshalb auch diese Schlitze (A) dementsprechend abgeschrägt sind und zusammenlaufende Flammenreihen (F), die untereinander rechtwinkelig sind, erzeugen.

7. Laut der vorherigen Ansprüche, besteht das Merkmal dieses Brenners darin, dass die Form des Innenraumes des Kopfes (2) der aus der Spezialform der Außenwände, der Unterwand der entsprechenden Hülse (29) und der aus verschiedenen Teilen zusammengestzten Wand (P) besteht, bewirkt zuerst, dass sich das Gasluftgemisch, das den Kopft speist, gleichmäßig verteilt und sich dann in Richtung der mehrschichtigen mit Schlitzen (A) versehenen Wand (P) zurichtet. Aus diesen Schlitzen kann das Gemisch dann gleichmäßig ausströmen und somit Flammenreihen (F), die gleichmäßig verteilt sind, erzeugen. Die Anwesenheit zuletzt des sich in der Innenseite der genannten Schlitze (A) befindlichen Metallsiebes (R) bewirkt den Durchlauf des Gasluftgemisches durch das Feinsieb und ermöglicht dadurch eine gleichmäßige Verteilung der Flammen. Gemäß eines bekannten physikalischen Prinzipes verhindert außerdem dieses Sieb jede Rückschlagszündung.

Revendications

1. Brûleur atmosphérique à gaz qui est utilisé particulièrement pour les friteuses et les tubes échangeurs calorifiques. Ce brûleur est composé essentielment d'un générateur (1) de mélange air/gaz connu, qui est normalment utilisé pour les brûleurs a gaz de type atmoshérique qui alimentent une tête spéciale (2), laquelle produit des flammes (F). Cette tête(2) possède une particulière conformation et est constituée d'une enveloppe (20) en tôle, qui s'étend symétriquement par rapport à la section verticale et passe le long de son axe longitudinal. En même temps l'enveloppe s'aligne à l'axe d'un tube "Venturi" (11) du générateur (1), qui alimente la tête mentionnée (2). Le bord périmétral de la correspondante partie supérieure ouverte de la tête est disposée, en un plan horizontal, parallèle à l'axe du tube "Venturi" (11) mentionné. La niche intérieure de l'enveloppe mentionnée (20) est définie par une paroi qui s'étend verticalement le long d'un profil symétrique par rapport à l'axe longitudinal du brûleur et par une paroi de fond, qui coupe la paroi périmétrale mentionnée avec des pièces, lesquelles partent de l'extrémité de l'alimentation et progressivement elles convergent vers la partie supérieure ouverte de l'enveloppe mentionnée. Cette partie supérieure ouverte de l'enveloppe (20) mentionnée est fermée avec une paroi hétérogène (P), laquelle est opportunément fixée sur son bord périmetral. Cette paroi hétérogène (P) se compose d'un petit filet métallique (R) et à l'extérieur elle est récouverte avec une membrane (D) en tôle appropriée et qui est pourvue de fentes (A) opportunes, d'où peut sortir le mélange air/gaz qui alimente la tête (2) mentionnée et engendre les flammes (F) respectives. Enfin sur les côtés de la tête (2) on a fait de petites gravures (C) correspondantes, qui pénètrent dans sa niche intérieure et engendrent les respectives petites flammes latérales (F1). Ces gravures permettent l'intrallumage en série des groupes de brûleurs, qui sont disposés parallèlement, côte à côte parmi eux.

2. Selon la revendication 1 la particuliarité de ce brûleur réside dans le fait que la paroi externe mentionnée de l'enveloppe (20) est composée tout d'abord d'une petite paroi plate et verticale (21), qui est essentiellement carrée et pourvue dans son centre d'un perçage dans lequel on introduit le bout du tube "Venturi" (11) qui est fixé orthogonalement à celle-ci (21). Des côtés de telle petite paroi plate et verticale (21) se départent deux pièces plates (22), qui s'écartent symétriquement entre eux et au même temps elles sont tournées vers la partie opposée à celle du tube "Venturi" mentionné. Ensuite elles se rassemblent à nouveau en deux pièces (23), qui sont arquées et convexes vers l'extérieur et qui se rassemblent à leur tour avec des ultérieures pièces (24), lesquelles sont arquées et convexes dans le sens contraire, en deux parois latérales plates (25). Ces parois continuent symétriquement parallèle entre elles pour un peu plus que la largeur trasversal de la petite paroi verticale plate (21). Ces parois terminent dans leurs extremités avec une pièce de paroi semicirculaire (26). Du bord supérieur de cette paroi une lèvre (L) part orthogonalement vers l'extérieur et elle est repliée vers l'intérieur avec une de ses parties (L1) et ainsi elle serre la partie externe de la paroi hétérogène (P), qui sera donc fermée hermétiquement sur ce bord supérieur.

3. Selon les revendications précédentes la particularité de ce brûleur réside dans le fait que la paroi inférieure de l'enveloppe (20) est constituée par une première pièce de paroi (27), qui part orthogonalement du bord inférieur de la petite paroi verticale et plate (21) et donc parallèlement à la paroi hétérogène opposée (P) et forme une niche, qui se développe avec une hauteur égale à celle de la petite paroi plate 21. Cette première pièce de la paroi 27 est presque aussi longue que la hauteur de la niche relative et finit pratiquement au début des parois plates latérales (25), où elles s'unissent à une deuxième pièce plate (28) inclinée de presque 45° vers le haut et s'étend presque jusqu'à 2/3 de la hauteur de la niche précédente. Cette deuxième pièce s'unit avec une troisième pièce plate (29), seulement légèrement inclinée vers le haut et qui se termine à son extrémité près du bord externe de la partie supérieure ouverte.

4. Selon les revendications précédentes la particuliarité de ce brûleur réside dans le fait que les fentes (A) pratiquées dans la membrane mentionée (D) de la paroi hétérogène (P) sont disposées dans la partie finale de cette membrane (D) qui s'étend pour presque 2/3 de sa longueur (D). Ces fentes (A) sont en outre divisées en deux rangées, qui sont symétriques et en même temps orthogonales par rapport à l'axe longitudinal de la membrane correspondante (D), de la façon à ce que leurs extrémités internes résultent discrètement distanciées entre elles et alignées symétriquement aux bord de l'axe longitudinal, tandis que les extrémités externes correspondantes se trouvent près de la partie intérieure du bord supérieur de la correspondante paroi externe de l'enveloppe (20).

5. Selon la revendication 4 la particuliarité de ce brûleur réside dans le fait que ces fentes (A) présentent une forme rctangulaire avec une largeur limitée à 1 mm environ et résultent distanciées une par rapport à l'autre d' un peu plus que leur largeur, c'est-à-dire de 1,5 mm.

6. Selon les revendications précédentes la particuliarité de ce brûleur réside dans le fait que la partie de la paroi hétérogène (P) , où se trouve la membrane correspondante (D) avec les fentes (A) est concave. Cette concavité résulte du fait que les deux pièces de la paroi (P), où sont alignées les rangées symétriques des fentes (A) convergent avec une inclination discrète qui va vers la partie inférieure de l'enveloppe (20) et donc ces fentes mêmes (A) sont inclinées et génèrent des rangées de flammes (F) qui convergent entre elles.

7. Selon les revendications précédentes la particuliarité de ce brûleur réside dans le fait que la forme de la niche interne de la tête (2), obtenue par les formes particulières des parois externes et du fond de la correspondente enveloppe (29) et de la paroi hétérogène (P) font en sorte que le mélange air/gaz, qui alimente la tête (20), se distribue tout d'abord de façon uniforme et se dirige puis vers la paroi hétérogène (P), qui contient les fentes (A) desquelles le mélange pourra sortir vers l'extérieur de façon uniforme par conséquence des rangées de flammes (F) distribuées celles aussi de façon uniforme. Enfin la présence de la grille métallique (R) qui se trouve dans la partie interne de ces fentes (A) provoque par conséquent le passage à travers les petits trous de sa maille du mélange air/gaz et contribue de cette façon à la distribution uniforme des flammes. Selon un principe physique connu elle empêche tout retour de flamme.

Drawing