Device for introducing and distributing fuel in a burner, particularly for a pellet-fired boiler or stove

Description

[0001] The present invention relates to a device for introducing and distributing fuel in a burner, particularly for a pellet-fired boiler or stove.

[0002] Boilers and stoves are currently in use which use as fuel small elements obtained by compressing sawdust or wood chips, also known as pellets.

[0003] These stoves and burners usually comprise a hopper, in which the pellets are stored and periodically introduced automatically in a burner, where they are burned; below the burner there is a removable tray for collecting the ash produced by combustion.

[0004] The pellets are removed from the hopper and introduced in the burner typically by means of a screw feeder, which is actuated by an electric motor and whose delivery leads into the combustion chamber.

[0005] The pellets thus exit from the screw feeder and fall into the burner, where they burn.

[0006] The main drawback of these known types of device is that the pellets always fall approximately in a same point of the burner and cover the ignited pellets that are present therein; accordingly, a concentration of unburned or imperfectly burned pellets forms in a limited region of the burner below the delivery of the screw feeder and can choke the combustion, reducing its efficiency considerably and even stopping it.

[0007] This effect occurs in particular with flow-rates of pellets introduced in the burner above 3-4 kg per hour.

[0008] In order to limit this drawback, pellet boilers and stoves are known in the burner of which there is a spatula which automatically moves the pellets that have fallen into the burner alternately into two preset positions, respectively to the right and to the left of the delivery of the screw feeder.

[0009] However, this known type of solution has a drawback: since two combustion focuses form within the burner, one to the right and one to the left of the delivery of the screw feeder, the flame, and therefore the distribution of the temperature within the burner, is not uniform.

[0010] Further, the spatula conveys the fresh pellets that fall into the burner so that they alternately cover the ignited pellets that are present respectively to the right and to the left of the delivery of the screw feeder; accordingly, two piles of unburned pellets form at the two combustion focuses and can choke the combustion and even stop it.

[0011] Moreover, the movement of the spatula can cause unburned pellets to fall into the ash collection tray, consequently wasting said pellets.

[0012] US-5 243 963 discloses a furnace for solid fuels, as defined in the preamble of claim 1.

[0013] WO 01/29481 discloses a stove and a feeding device for a burner.

[0014] US 5 070 798 discloses pellet burner appliances and burners therefor.

[0015] The aim of the present invention is to solve the above mentioned problems, eliminating the drawbacks of the cited background art, by providing a device which allows to introduce automatically the fuel in a burner, particularly of a pellet boiler or stove, so as to maintain high combustion efficiency.

[0016] Within this aim, an object of the invention is to provide a device that allows to feed the fuel to the burner without the risk of interrupting combustion.

[0017] Another object of the invention is to allow to obtain a flame which is as uniform as possible, so as to make the temperature in the burner uniform by making the combustion uniform.

[0018] Another object of the invention is to minimize the waste of pellets.

[0019] Another object is to provide a device which is structurally simple and has low manufacturing costs.

[0020] This aim and these and other objects, which will become better apparent hereinafter, are achieved by a device for introducing and distributing fuel in a burner, particularly for a pellet stove or boiler, as defined in claim 1.

[0021] Further characteristics and advantages of the invention will become better apparent from the following detailed description of a particular but not exclusive embodiment thereof, illustrated by way of non-limiting example in the accompanying drawings, wherein:

Figure 1 is a front perspective view of a device according to the invention;

Figure 2 is a rear perspective view of the device of Figure 1;

Figure 3 is a side view of the device of Figure 1;

Figure 4 is a front view of the device of Figure 1;

Figure 5 is a sectional view, taken along the line V-V of Figure 4;

Figure 6 is a sectional view, taken along the line VI-VI of Figure 4;

Figure 7 is a sectional view, taken along the line VII-VII of Figure 6.

[0022] In the exemplary embodiments that follow, individual characteristics, given in relation to specific examples, may actually be interchanged with other different characteristics that exist in other exemplary embodiments.

[0023] With reference to the figures, the reference numeral 1 designates a device for introducing and distributing fuel in a burner, particularly for a pellet stove or boiler, not shown in the accompanying figures.

[0024] The device 1 comprises at least one screw feeder 2, constituted by a substantially cylindrical tubular element 3, which is contained partially within a box-like body 5 which has a transverse cross-section shaped approximately like an inverted letter Ω and affects longitudinally the entre tubular element 3.

[0025] The box-like body 5 forms a bottom 6, which is substantially flat and approximately parallel to the longitudinal axis of the tubular element 3 and is advantageously approximately rectangular in plan view; two arms, respectively designated by the reference numerals 7a and 7b, protrude approximately at right angles from the longitudinal perimetric edges of said bottom and partially enclose laterally the tubular element 3; two wings, respectively designated by the reference numerals 8a and 8b, protrude from the free ends of the arms 7a and 7b approximately at right angles, on the opposite side with respect to the tubular element 3.

[0026] A first opening 10 is provided proximate to the rear end 9 of the tubular element 3, on the lateral surface thereof, opposite the bottom 6 of the box-like body 5, advantageously has an approximately rectangular plan shape and is suitable to introduce into the screw feeder 2 the pellets contained in an overlying hopper, not shown in the accompanying figures.

[0027] Two second openings, generally designated by the reference numeral 12, are provided proximate to the front end 11 of the tubular element 3, on its lateral surface and on the facing bottom 6 of the box-like body 5; said second openings are substantially mutually identical, face each other, and advantageously have an approximately circular plan shape; a tube 13 protrudes from the perimetric edge of the second opening provided in the tubular element 3 approximately at right angles and toward the outside of said element, so as to pass through the facing second opening provided in the bottom 6; the tube 13 constitutes the delivery of the screw feeder 2 and is advantageously shaped, in a cross-section taken along a plane which is perpendicular to the bottom 6 and passes through the longitudinal central plane thereof, approximately like a right trapezoid, in which the parallel sides are perpendicular to the bottom 6 and the oblique side is directed away from the rear end 9 of the tubular element 3.

[0028] Advantageously, two first tabs, respectively designated by the reference numerals 14a and 14b, protrude from the longitudinal ends of the bottom 6 of the box-like body 5, proximate to the front end 11 of the tubular element 3 and laterally with respect to the tube 13, and lie approximately on the same plane as the bottom 6 and advantageously have an approximately rectangular plan shape.

[0029] Advantageously, a second tab 50, which advantageously has an approximately rectangular plan shape, protrudes from the bottom 6 of the box-like body 5, approximately at right angles and to the rear of the tube 13, and a third advantageously substantially circular opening, not shown in the accompanying figures, is provided approximately centrally in said second tab.

[0030] The tubular element 3 and the box-like body 5 are closed, respectively at the rear and front ends of the tubular element 3, by a first flange 15 and by a second flange 16, between which the shaft 17 of a worm screw 18 is supported rotatably; said worm screw is suitable to convey the pellets from the rear end 9 to the front end 11 of the tubular element 3, so as to make them exit by gravity from the tube 13 which constitutes the delivery of the screw feeder 2.

[0031] Advantageously, a first end 19 of the shaft 17 is supported rotatably in an appropriately provided through hole, not shown in the accompanying figures, which is provided approximately centrally with respect to the first flange 15, while the second end 20 of the shaft 17 is advantageously supported rotatably in an appropriately provided seat, which is approximately cylindrical and is formed by an annular protrusion 21, which protrudes approximately centrally from the second flange 16 toward the inside of the tubular element 3.

[0032] Advantageously, the first end 19 of the shaft 17 protrudes longitudinally outside the tubular element 3 and engages suitable motion-generation means, constituted for example by a gearmotor 22.

[0033] Means for the conveyance and uniform distribution of the pellets into the burner are associated with the delivery of the screw feeder 2 and comprise advantageously a first chute 23, which protrudes approximately at right angles from the bottom 6 of the box-like body 5 at the first tabs 14a and 14b to the rear of the tube 13.

[0034] The first chute 23 is advantageously constituted by a first plate 24, which is preferably approximately flat and substantially perpendicular to the bottom 6 and is connected to said bottom and to the first tabs 14a and 14b at a first transverse end, to the rear of the tube 13; advantageously, the first plate 24 is rigidly associated with the second tab 50, for example by bolting.

[0035] A fourth opening, not shown in the accompanying figures and advantageously but not necessarily circular, is provided in the first plate 24, in the region thereof which faces the tube 13 and at the third opening provided in the second tab 50.

[0036] Two first shoulders, designated respectively by the reference numerals 25a and 25b, protrude from the longitudinal ends of the first plate 24 approximately at right angles thereof and in the opposite direction with respect to the rear end 9 of the tubular element 3 and enclose laterally the tube 13.

[0037] The first chute 23 is further connected to the tubular element 3 by means of an appropriately provided strut 26, which is fixed with one of its ends to the bottom 6 of the box-like body 5 and with its other end to the first plate 24.

[0038] Such means for conveying and uniformly distributing the pellets further comprise a second chute 27, which is associated rotatably, by means of its upper end, with the first chute 23 in the region thereof that is contiguous to the tube 13.

[0039] Advantageously, the second chute 27 is constituted by a second plate 28, which is preferably approximately flat and substantially parallel to the first plate 24 and advantageously has an approximately isosceles-trapezoid plan shape, in which the longer parallel side 29 is arranged between the tube 13 and the first plate 24.

[0040] Two second shoulders, designated respectively by the reference numerals 30a and 30b, protrude from the longitudinal ends of the second plate 28, approximately at right angles and in the opposite direction with respect to the first plate 24; during use, the second shoulders are arranged laterally with respect to the tube 13 and inside the first shoulders 25a, 25b of the first chute 23.

[0041] Advantageously, the second plate 28 of the second chute 27 is keyed, proximate to its longer parallel side 29, to a secondary shaft 31, which is arranged so that its longitudinal axis is approximately perpendicular to the first plate 24 and rotatably associated with the fourth opening provided therein and with the third opening of the second tab 50 by way of suitable rotary support means of a known type, such as for example a first cylindrical guide 32, which is fixed to the second tab 50 on the opposite side with respect to the tube 13; the second chute 27 can thus be turned with respect to the first chute 23 about the longitudinal axis of the secondary shaft 31, by way of suitable motion-transmission means which are connected to the motion-generation means.

[0042] The motion-generation means comprise a first pulley 33, which is advantageously provided with teeth and is keyed to the portion of the first end 19 of the shaft 17 that protrudes from the tubular element 3 and is connected, by means of a belt 34, which is advantageously a toothed belt, to a second pulley 35, which is keyed to an underlying shaft 36, which is approximately parallel to the shaft 17 and is advantageously axially offset with respect to said shaft relative to a plane which is perpendicular to the first plate 24 of the first chute 23 and passes through the central longitudinal axis of said plate.

[0043] The shaft 36 is supported rotatably by a second cylindrical guide 37, which is in turn supported by an appropriately provided bracket 38 connected to the box-like body 5.

[0044] A cam 39 is keyed to the end of the shaft 36 that is directed toward the first chute 23, and one end of a linkage 40 is pivoted to the cam; such linkage 40 is pivoted, at the other end, to a crank 41, which is keyed to the secondary shaft 31.

[0045] Operation is therefore as follows: with reference to the accompanying figures, the device 1 is associated for example with a pellet boiler or stove by arranging the rear end 9 of the tubular element 3 at the bottom of the pellet hopper, so that said pellets can enter the first opening 10 by gravity.

[0046] The front end 11 of the tubular element 3 is instead arranged within the burner, not shown in the accompanying figures, of the boiler or stove, directing the first chute 23 toward the underlying combustion chamber of said burner.

[0047] Advantageously, the device 1 is arranged so that the shaft 17 is inclined at approximately 45° with respect to the horizontal plane.

[0048] By turning the worm screw 18 by means of the gearmotor 22, the pellets are moved within the tubular element 3 and thus arrive at the second opening 12, from which they exit by gravity through the tube 13.

[0049] The rotation of the shaft 17 entails the rotation of the first pulley 33, which is keyed to it; the first pulley 33, by means of the toothed belt 34, turns the second pulley 35 and the shaft 36 to which said pulley is keyed.

[0050] Accordingly, the cam 39, the linkage 40 and the crank 41 are also turned, producing the oscillation of the secondary shaft 31 with respect to its longitudinal axis.

[0051] The second chute 27, which is keyed to the secondary shaft 31, thus oscillates periodically with respect to the first chute 23; the pellets that exit from the tube 13 enter the second chute 27, traveling along it by gravity, and thus reach the first chute 23, from which they fall into the combustion chamber of the burner.

[0052] The oscillation of the second chute 27 prevents the pellets from falling in a single region of the burner and distributes them approximately uniformly therein.

[0053] It has thus been found that the invention has achieved the intended aim and objects, a device having been devised for introducing fuel in a burner, particularly for a pellet stove or boiler, which allows to obtain a uniform distribution of the pellets in the burner, so as to achieve high efficiency in combustion.

[0054] Further, the possibility to distribute the pellets uniformly reduces the risk that an excessive accumulation of said pellets in a confined region of the burner might interrupt combustion.

[0055] By way of the uniform distribution of the pellets, it is further possible to achieve a more uniform flame, so as to render the temperature of the burner uniform.

[0056] Further, the production costs of the device according to the invention remain low, since it is provided only by means of components which are easy to manufacture and/or assemble.

[0057] The invention is of course susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.

[0058] Of course, the materials used, as well as the dimensions that constitute the individual components of the invention, may be more pertinent according to the specific requirements.

[0059] Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A device for introducing and distributing fuel in a burner, particularly for a pellet stove or boiler, comprising at least one screw feeder (18) the delivery of which is connected to said burner, and wherein means for the conveyance and uniform distribution of said fuel in said burner are associated with said delivery of said at least one screw feeder, and wherein a tube (13) constitutes said delivery of said screw feeder, characterized in that said means for the conveyance and uniform distribution of said fuel in said burner comprise a second chute (27) that is associated rotatably, by means of its upper end, with a first chute (23) in a region thereof which is contiguous to said tube.

2. The device according to claim 1, characterized in that said at least one screw feeder is constituted by a substantially cylindrical tubular element, which is contained partially in a box-like body which has a transverse cross-section shaped approximately like an inverted letter Ω and affects longitudinally all of said tubular element, said box-like body forming a bottom, which is substantially flat and approximately parallel to the longitudinal axis of said tubular element and has, in plan view, an approximately rectangular shape, two arms protruding approximately at right angles from the longitudinal perimetric edges thereof, said arms partially enclosing laterally said tubular element, a first opening suitable for the introduction of said pellets in said screw feeder being provided at the opposite end with respect to said bottom of said box-like body proximate to the rear end of said tubular element, on its lateral surface.

3. The device according to claims 1 and 2, characterized in that two second openings are provided proximate to the front end of said tubular element, on its lateral surface and on said facing bottom of said box-like body, said openings being substantially mutually identical and facing each other, a tube which constitutes said delivery of said screw feeder protruding from the perimetric edge of said second opening provided in said tubular element approximately at right angles and toward the outside of said tubular element so as to pass through said facing second opening provided in said bottom.

4. The device according to claims 1 and 3, characterized in that said tube is shaped, in a cross-section taken along a plane which is perpendicular to said bottom and passes through its longitudinal central plane, approximately like a right trapezoid, in which the parallel sides are perpendicular to said bottom and the oblique side is directed away from said rear end of said tubular element.

5. The device according to claim 2, characterized in that two first tabs protrude from the longitudinal ends of said bottom of said box-like body, proximate to said front end of said tubular element and laterally to said tube, and lie approximately on the same plane as said bottom.

6. The device according to claim 5, characterized in that a second tab protrudes from said bottom of said box-like body, approximately at right angles and to the rear of said tube, and has an approximately rectangular plan shape, a third opening being provided approximately centrally thereto.

7. The device according to claim 2, characterized in that said tubular element and said box-like body are closed, respectively at the rear and front ends of said tubular element, by a first flange and a second flange, between which a shaft of a worm screw is supported rotatably, said worm screw being suitable to convey said pellets from said rear end to said front end of said tubular element, so as to make them exit by gravity from said tube which constitutes said delivery of said screw feeder.

8. The device according to claims 1 and 7, characterized in that a first end of said shaft is supported rotatably in a hole formed approximately centrally with respect to said first flange, a second end of said shaft being supported rotatably in an appropriately provided seat, which is approximately cylindrical and is formed by an annular protrusion which protrudes approximately centrally from said second flange toward the inside of said tubular element.

9. The device according to claims 1 and 8, characterized in that said first end of said shaft protrudes longitudinally outside said tubular element and engages motion-generation means, constituted preferably by a gearmotor.

10. The device according to one or more of the preceding claims, characterized in that said means for uniform distribution and conveyance of said pellets within said burner comprise a first chute, which protrudes approximately at right angles from said bottom of said box-like body at said first tabs and to the rear of said tube.

11. The device according to claims 1 and 10, characterized in that said first chute is constituted by a first plate which is approximately flat and substantially perpendicular to said bottom and is connected to said bottom and to said first tabs, at a first transverse end thereof, to the rear of said tube.

12. The device according to claims 1 and 13, characterized in that said first plate is rigidly associated with said second tab.

13. The device according to claims 1 and 12, characterized in that a fourth opening is provided in said first plate in the region thereof which faces said tube and at said third opening provided in said second tab.

14. The device according to claims 1 and 13, characterized in that two first shoulders which enclose laterally said tube protrude from the longitudinal ends of said first plate approximately at right angles thereto and in the opposite direction with respect to said rear end of said tubular element.

15. The device according to claims 1 and 14, characterized in that said first chute is connected to said first tubular element by means of an appropriately provided strut, which is fixed by means of one of its ends to said bottom of said box-like body and by means of its other end to said first plate.

16. The device according to claim 10, characterized in that said rotatable chute is constituted by a second plate, which is approximately flat and substantially parallel to said first plate and advantageously has an approximately isosceles-trapezoid plan shape, in which the longer parallel side is arranged between said tube and said first plate.

17. The device according to claim 16, characterized in that two second shoulders protrude from the longitudinal ends of said second plate, approximately at right angles and at the opposite end with respect to said first plate, and are arranged laterally, during use, with respect to said tube and within said first shoulders of said first chute.

18. The device according to claim 17, characterized in that said second plate of said second chute is keyed, proximate to the longer parallel side thereof, to a secondary shaft, which is arranged so that its longitudinal axis is approximately perpendicular to said first plate and is rotatably, associated with said fourth opening provided in said first plate and with said third opening of said second tab by way of suitable rotary support means.

19. The device according to claims 18, characterized in that said rotary support means are constituted by a first cylindrical guide, which is fixed to said second tab on the opposite side with respect to said tube, said second chute being able to rotate with respect to said first chute about the longitudinal, axis of said secondary shaft by way of the action of suitable motion-transmission means connected to said motion-generation means.

20. The device according to claim 19, characterized in that said motion-transmission means comprise a first pulley, which is keyed to the portion of said first end of said shaft which protrudes from said tubular element and is connected, by means of a belt, to a second pulley which is keyed to an underling shaft, which is approximately parallel to said shaft and is axially offset with respect to it relative to a plane which is perpendicular to said first plate of said first chute and passes through the longitudinal central axis thereof.

21. The device according to claim 20, characterized in that said shaft is supported rotatably by a second cylindrical guide, which in turn is supported by an appropriately provided bracket connected to said box-like body, a cam being keyed to the end of said shaft that is directed toward said first chute, one end of a linkage being pivoted to said carn, said linkage being pivoted, at its other end, to a crank which is keyed to said secondary shaft.

Ansprüche

1. Vorrichtung zum Einleiten und Verteilen von Brennstoff in einem Brenner, insbesondere für einen Pellet-Ofen oder einen Kessel, die wenigstens einen Schraubenförderer (18) umfasst, dessen Ausgabe mit dem Brenner verbunden ist, wobei der Ausgabe des wenigstens einen Schraubenförderers Mittel für den Transport und die gleichmäßige Verteilung des Brennstoffs in dem Brenner zugeordnet sind und wobei ein Rohr (13) die Ausgabe des Schraubenförderers bildet, dadurch gekennzeichnet, dass die Mittel für den Transport und die gleichmäßige Verteilung des Brennstoffs in dem Brenner eine zweite Rutsche (27) umfassen, die mit ihrem oberen Ende einer ersten Rutsche (23) in einem an das Rohr angrenzenden Bereich drehbar zugeordnet ist.

2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der wenigstens eine Schraubenförderer durch ein im Wesentlichen zylindrisches rohrförmiges Element gebildet ist, das teilweise in einem kastenartigen Körper enthalten ist, der einen Querschnitt besitzt, der angenähert wie ein umgedrehter Buchstabe Ω geformt ist und auf das gesamte rohrförmige Element in Längsrichtung einwirkt, wobei der kastenartige Körper einen Boden bildet, der im Wesentlichen eben ist und zu der Längsachse des rohrförmigen Elements ungefähr parallel ist und in der Draufsicht eine ungefähr rechtwinklige Form hat, wobei zwei Arme ungefähr rechtwinklig von den longitudinalen Umfangskanten hiervon vorstehen, wobei die Arme das rohrförmige Element seitlich teilweise umschließen, wobei am gegenüberliegenden Ende in Bezug auf den Boden des kastenartigen Körpers in der Nähe des hinteren Endes des rohrförmigen Elements an seiner seitlichen Oberfläche eine erste Öffnung vorgesehen ist, die für die Einleitung der Pellets in den Schraubenförderer geeignet ist.

3. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass in der Nähe des vorderen Endes des rohrförmigen Elements auf seiner seitlichen Oberfläche und auf dem zugewandten Boden des kastenartigen Körpers zwei zweite Öffnungen vorgesehen sind, wobei diese Öffnungen im Wesentlichen miteinander identisch sind und einander zugewiesen sind, wobei ein Rohr, das die Ausgabe des Schraubenförderers bildet, von der Umfangskante der zweiten Öffnung, die in dem rohrförmigen Element vorgesehen ist, ungefähr rechtwinklig und in Richtung zu der Außenseite des rohrförmigen Elements vorsteht, damit es durch die zugewandte, im Boden vorgesehene zweite offnung verläuft.

4. Vorrichtung nach den Ansprüchen 1 und 3, dadurch gekennzeichnet, dass das Rohr in einem Querschnitt längs einer Ebene, die zu dem Boden senkrecht ist und durch seine longitudinale Mittelebene verläuft, ungefähr wie ein rechtwinkliges Trapez geformt ist, in dem die parallelen Seiten zum Boden senkrecht sind und die schräge Seite von dem hinteren Ende des rohrförmigen Elements weggerichtet ist.

5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass zwei erste Ansätze von den longitudinalen Enden des Bodens des kastenartigen Körpers in der Nähe des vorderen Endes des rohrförmigen Elements und seitlich in Bezug auf das Rohr vorstehen und ungefähr in der gleichen Ebene wie der Boden liegen.

6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass ein zweiter Ansatz von dem Boden des kastenartigen Körpers ungefähr rechtwinklig und zur Rückseite des Rohrs vorsteht und eine ungefähr rechtwinklige ebene Form besitzt, wobei ungefähr mittig hiervon eine dritte Öffnung vorgesehen ist.

7. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das rohrförmige Element und der kastenartige Körper am hinteren bzw. am vorderen Ende des rohrförmigen Elements durch einen ersten Flansch bzw. einen zweiten Flansch verschlossen sind, zwischen denen eine Welle einer Schneckenschraube drehbar unterstützt ist, wobei die Schneckenschraube die Pellets von dem hinteren Ende zu dem vorderen Ende des rohrförmigen Elements transportieren kann, damit sie aus dem Rohr, das die Ausgabe des Schraubenförderers bildet, durch die Schwerkraft austreten.

8. Vorrichtung nach den Ansprüchen 1 und 7, dadurch gekennzeichnet, dass ein erstes Ende der Welle in einem Loch, das ungefähr mittig in Bezug auf den ersten Flansch gebildet ist, drehbar unterstützt ist, ein zweites Ende der Welle in einem geeignet vorgesehenen Sitz drehbar unterstützt ist, der ungefähr zylindrisch ist und durch einen ringförmigen Vorsprung gebildet ist, der ungefähr mittig von dem zweiten Flansch in Richtung zu der Innenseite des rohrförmigen Elements vorsteht.

9. Vorrichtung nach den Ansprüchen 1 und 8, dadurch gekennzeichnet, dass das erste Ende der Welle in Längsrichtung aus dem rohrförmigen Element vorsteht und mit Bewegungserzeugungsmitteln, die vorzugsweise durch einen Getriebemotor gebildet sind, in Eingriff ist.

10. Vorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mittel für die gleichmäßige Verteilung und den Transport der Pellets in dem Brenner eine erste Rutsche umfassen, die ungefähr rechtwinklig von dem Boden des kastenartigen Körpers bei den ersten Ansätzen und in Richtung zum hinteren Ende des Rohrs vorsteht.

11. Vorrichtung nach den Ansprüchen 1 und 10, dadurch gekennzeichnet, dass die erste Rutsche durch eine erste Platte gebildet ist, die ungefähr eben ist und zu dem Boden im Wesentlichen senkrecht ist und mit dem Boden sowie mit den ersten Ansätzen an einem ersten transversalen Ende hiervon an der Rückseite des Rohrs verbunden ist.

12. Vorrichtung nach den Ansprüchen 1 und 11, dadurch gekennzeichnet, dass die erste Platte dem zweiten Ansatz starr zugeordnet ist.

13. Vorrichtung nach den Ansprüchen 1 und 12, dadurch gekennzeichnet, dass in der ersten Platte in dem Bereich hiervon, der dem Rohr zugewandt ist, und bei der dritten Öffnung, die in dem zweiten Ansatz vorgesehen ist, eine vierte Öffnung vorgesehen ist.

14. Vorrichtung nach den Ansprüchen 1 und 13, dadurch gekennzeichnet, dass zwei erste Schultern, die das Rohr seitlich umschließen, von den longitudinalen Enden der ersten Platte ungefähr rechtwinklig hierzu und in der entgegengesetzten Richtung in Bezug auf das hintere Ende des rohrförmigen Elements vorstehen.

15. Vorrichtung nach den Ansprüchen 1 und 14, dadurch gekennzeichnet, dass die erste Rutsche mit dem ersten rohrförmigen Element mittels einer geeignet vorgesehenen Strebe verbunden ist, die mittels eines ihrer Enden am Boden des kastenartigen Körpers und mittels ihres anderen Endes an der ersten Platte befestigt ist.

16. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die drehbare Rutsche durch eine zweite Platte gebildet ist, die ungefähr flach ist und zu der ersten Platte im Wesentlichen parallel ist und vorteilhaft die Form eines ebenen, ungefähr gleichschenkligen Trapezes besitzt, in dem die längere parallele Seite zwischen dem Rohr und der ersten Ebene angeordnet ist.

17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass zwei zweite Schultern von den longitudinalen Enden der zweiten Platte ungefähr rechtwinklig und an dem gegenüberliegenden Ende in Bezug auf die erste Platte vorstehen und während des Gebrauchs in Bezug auf das Rohr seitlich und innerhalb der ersten Schultern der ersten Rutsche angeordnet sind.

18. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass die zweite Platte der zweiten Rutsche in der Nähe ihrer längeren parallelen Seite mit einer sekundären Welle verkeilt ist, die in der Weise angeordnet ist, dass ihre Längsachse zu der ersten Platte ungefähr senkrecht ist, und der vierten Öffnung, die in der ersten Platte vorgesehen ist, und der dritten Öffnung des zweiten Ansatzes mittels geeigneter Drehunterstützungsmittel drehbar zugeordnet ist.

19. Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, dass die Drehunterstützungsmittel durch eine erste zylindrische Führung gebildet sind, die an dem zweiten Ansatz auf der gegenüberliegenden Seite in Bezug auf das Rohr befestigt ist, wobei sich die zweite Rutsche in Bezug auf die erste Rutsche um die Längsachse der sekundären Welle mittels der Wirkung geeigneter Bewegungsübertragungsmittel, die mit den Bewegungserzeugungsmitteln verbunden sind, drehbar ist.

20. Vorrichtung nach Anspruch 19, dadurch gekennzeichnet, dass die Bewegungsübertragungsmittel eine erste Riemenscheibe, die mit dem Abschnitt des ersten Endes der Welle verkeilt ist, der von dem rohrförmigen Element vorsteht, und mittels eines Riemens mit einer zweiten Riemenscheibe verbunden ist, die an einer darunterliegenden Welle verkeilt ist, die zu der Welle ungefähr parallel ist und in Bezug zu dieser relativ zu einer Ebene, die zu der ersten Platte der ersten Rutsche senkrecht ist und durch die longitudinale Mittelachse hiervon verläuft, axial versetzt ist.

21. Vorrichtung nach Anspruch 20, dadurch gekennzeichnet, dass die Welle durch eine zweite zylindrische Führung drehbar unterstützt ist, die ihrerseits durch einen geeignet vorgesehenen Arm unterstützt ist, der mit dem kastenartigen Körper verbunden ist, wobei ein Nocken mit dem Ende der Welle verkeilt ist, das zu der ersten Rutsche gerichtet ist, wobei ein Ende eines Gestänges an dem Nocken angelenkt ist, wobei das Gestänge an seinem anderen Ende an einer Kurbel angelenkt ist, die mit der zweiten Welle verkeilt ist.

Revendications

1. Dispositif destiné à introduite et à distribuer du combustible dans un brûleur, en particulier destiné à un poêle ou une chaudière à pastilles de combustible, comprenant au moins un dispositif d'alimentation à vis (18) dont la sortie est connectée audit brûleur, et dans lequel des moyens destinés au transport et à une distribution uniforme dudit combustible dans ledit brûleur sont associés à ladite sortie dudit au moins un dispositif d'alimentation à vis, et dans lequel un tube (13) constitue ladite sortie dudit dispositif d'alimentation à vis, caractérisé en ce que lesdits moyens destinés au transport et à une distribution uniforme dudit combustible dans ledit brûleur comprennent une seconde goulotte (27) qui est associée en rotation, par l'intermédiaire de son extrémité supérieure, à une première goulotte (23) dans une région de celle-ci qui est contiguë audit tube.

2. Dispositif selon la revendication 1, caractérisé en ce que ledit au moins un dispositif d'alimentation à vis est constitué par un élément tubulaire sensiblement cylindrique, qui est content en partie dans un corps similaire à une boîte qui présente une section transversale dont la forme est approximativement similaire à celle de la lettre Ω inversée et qui affecte de manière longitudinale la totalité dudit élément tubulaire, ledit corps similaire à une boîte formant un fond, qui est sensiblement plat et approximativement parallèle à l'axe longitudinal dudit élément tubulaire et qui présente, dans une vue en plan, une forme approximativement rectangulaire, deux bras faisant saillie approximativement à angles droits à partir des bords périmétriques longitudinaux de celui-ci, lesdits bras enfermant en partie de manière latérale ledit élément tubulaire, une première ouverture appropriée à l'introduction desdites pastilles de combustible dans ledit dispositif d'alimentation à vis étant disposée au niveau de l'extrémité opposée par rapport audit fond dudit corps similaire à une boîte à proximité de l'extrémité arrière dudit élément tubulaire, sur sa surface latérale.

3. Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que deux deuxièmes ouvertures sont disposées à proximité de l'extrémité avant dudit élément tubulaire, sur sa surface latérale et sur ledit fond dudit corps similaire à une boîte qui fait face, lesdites ouvertures étant sensiblement identiques de manière mutuelle et se faisant face l'une à l'autre, un tube qui constitue ladite sortie dudit dispositif d'alimentation à vis faisant saillie à partir du bord périmétrique de ladite deuxième ouverture disposée dans ledit élément tubulaire approximativement à angles droits et vers l'extérieur dudit élément tubulaire de façon à passer à travers ladite deuxième ouverture qui fait face disposée dans ledit fond.

4. Dispositif selon l'une quelconque des revendications 1 et 3, caractérisé en ce que la forme de la section transversale dudit tube prise le long d'un plan qui est perpendiculaire audit fond et qui passe par son plan central longitudinal, est approximativement similaire à celle d'un trapèze rectangle, dans lequel les côtés parallèles sont perpendiculaires audit fond et le côté oblique est dirigé en allant s'éloignant de ladite extrémité arrière dudit élément tubulaire.

5. Dispositif selon la revendication 2, caractérisé en ce que deux premières pattes font saillie à partir des extrémités longitudinales dudit fond dudit corps similaire à une boîte, à proximité de ladite extrémité avant dudit élément tubulaire et de manière latérale par rapport audit tube, et se situent approximativement dans le même plan que ledit fond.

6. Dispositif selon la revendication 5, caractérisé en ce qu'une deuxième patte fait saillie à partir dudit fond dudit corps similaire à une boîte, approximativement à angles droits et vers l'arrière dudit tube, et présente une forme en plan approximativement rectangulaire, une troisième ouverture étant disposée approximativement au centre de celle-ci.

7. Dispositif selon la revendication 2, caractérisé en ce que ledit élément tubulaire et ledit corps similaire à une boîte sont fermés, respectivement au niveau des extrémités arrière et avant dudit élément tubulaire, par une première bride et par une seconde bride, entre lesquelles l'arbre d'une vis sans fin est supporté en rotation, ladite vis sans fin étant appropriée pour acheminer lesdites pastilles de combustible à partir de ladite extrémité arrière vers ladite extrémité avant dudit élément tubulaire, de façon à les faire sortir par gravitation à partir dudit tube qui constitue ladite sortie dudit dispositif d'alimentation à vis.

8. Dispositif selon l'une quelconque des revendications 1 et 7, caractérisé en ce qu'une première extrémité dudit arbre est supportée en rotation dans un trou formé approximativement de manière centrale par rapport à ladite première bride, une seconde extrémité dudit arbre étant supportée en rotation dans une portée disposée de manière appropriée, qui est approximativement cylindrique et est constituée par une saillie annulaire qui fait saillie approximativement de manière centrale à partir de ladite seconde bride vers l'intérieur dudit élément tubulaire.

9. Dispositif selon l'une quelconque des revendications 1 et 8, caractérisé en ce que ladite première extrémité dudit arbre fait saillie de manière longitudinale à l'extérieur dudit élément tubulaire et vient en prise avec des moyens de génération de mouvement, constitués de préférence par un moteur à engrenages.

10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens destinés au transport et à une distribution uniforme desdites pastilles de combustible à l'intérieur dudit brûleur comprennent une première goulotte, qui fait saillie approximativement à angles droits à partir dudit fond dudit corps similaire à une boîte au niveau desdites premières pattes et vers l'arrière dudit tube.

11. seconde Dispositif selon l'une quelconque des revendications 1 et 10, caractérisé en ce ladite première goulotte est constituée par une première plaque qui est approximativement plate et sensiblement perpendiculaire audit fond et est connectée audit fond et auxdites premières pattes, au niveau d'une première extrémité transversale de celles-ci, vers l'arrière dudit tube.

12. Dispositif selon l'une quelconque des revendications 1 et 11, caractérisé en ce que ladite première plaque est associée de manière rigide à ladite deuxième patte.

13. Dispositif selon l'une quelconque des revendications 1 et 12, caractérisé en ce qu'une quatrième ouverture est disposée dans ladite première plaque dans une région de celle-ci qui fait face audit tube et au niveau de ladite troisième ouverture disposée dans ladite deuxième patte.

14. Dispositif selon l'une quelconque des revendications 1 et 13, caractérisé en ce que deux premiers épaulements qui enferment de manière latérale ledit tube font saillie à partir des extrémités longitudinales de ladite première plaque approximativement à angles droits par rapport à celle-ci et dans la direction opposée par rapport à ladite extrémité arrière dudit élément tubulaire.

15. Dispositif selon l'une quelconque des revendications 1 et 14, caractérisé en ce que ladite première goulotte est connectée audit premier élément tubulaire au moyen d'une entretoise disposée de manière appropriée, qui est fixée au moyen de l'une de ses extrémités audit fond dudit corps similaire à une boîte et au moyen de son autre extrémité à ladite première plaque.

16. Dispositif selon la revendication 10, caractérisé en ce que ladite goulotte rotative est constituée par une seconde plaque, qui est approximativement plate et sensiblement parallèle à ladite première plaque et présente de manière avantageuse une forme en plan approximativement de trapèze isocèle, dans laquelle le côté parallèle le plus long est disposé entre ledit tube et ladite première plaque.

17. Dispositif selon la revendication 16, caractérisé en ce que deux deuxièmes épaulements font saillie à partir des extrémités longitudinales de ladite seconde plaque, approximativement à angles droits et au niveau de l'extrémité opposée par rapport à ladite première plaque, et sont disposés de manière latérale, en service, par rapport audit tube et à l'intérieur desdits premiers épaulements de ladite première goulotte.

18. Dispositif selon la revendication 17, caractérisé en ce que ladite seconde plaque de ladite seconde goulotte est clavetée, à proximité du côté parallèle le plus long de celle-ci, sur un arbre secondaire, qui est disposé de telle sorte que son axe longitudinal soit approximativement perpendiculaire à ladite première plaque et soit associé en rotation à ladite quatrième ouverture disposée dans ladite première plaque et à ladite troisième ouverture de ladite deuxième patte à l'aide de moyens de support rotatifs appropriés.

19. Dispositif selon la revendication 18, caractérisé en ce que lesdits moyens de support rotatifs sont constitués par un premier guide cylindrique, qui est fixé sur ladite deuxième patte sur le côté opposé par rapport audit tube, ladite seconde goulotte pouvant tourner par rapport à ladite première goulotte autour de l'axe longitudinal dudit arbre secondaire suite à l'action de moyens de transmission de mouvement appropriés connectés auxdits moyens de génération de mouvement.

20. Dispositif selon la revendication 19, caractérisé en ce que lesdits moyens de transmission de mouvement comprennent une première poulie, qui est clavetée sur la partie de ladite première extrémité dudit arbre qui fait saillie à partir dudit élément tubulaire et est connectée, au moyen d'une courroie, à une seconde poulie qui est clavetée sur un arbre sous-jacent, qui est approximativement parallèle audit arbre et est décalée de manière axiale de celle-ci par rapport à un plan qui est perpendiculaire à ladite première plaque de ladite première goulotte et qui passe par l'axe central longitudinal de celle-ci.

21. Dispositif selon la revendication 20, caractérisé en ce que ledit arbre est supporté en rotation par un second guide cylindrique, qui est supporté à son tour par un support disposé de manière appropriée, connecté audit corps similaire à une boîte, une came étant clavetée sur l'extrémité dudit arbre en direction de ladite première goulotte, une extrémité d'une tringlerie pivotant vers ladite came, ladite tringlerie pivotant, au niveau de son autre extrémité, vers une manivelle qui est clavetée sur ledit second arbre.

Drawing