GAS BURNER UNIT FOR A HEAT EXCHANGER

Description

[0001] The invention concerns a gas burner unit intended for a heat exchanger.

[0002] In the known solutions, the heat exchanger gas burner unit incorporates a perforated burner wall and an air and fuel duct used to supply the air and fuel mix to the perforated burner wall. The operating burner unit generates substantial noise which can be a nuisance to the surrounding environment.

[0003] Known from patent document JPH 0264306 A is a heat exchanger in which the inner space of the chamber for the air and fuel mix supplied to the burner is divided with a flat baffle spreading along the chamber and featuring small holes. The baffle is intended to e.g. suppress the noise generated by the operating burner.

[0004] Know from patent document EP 1 498 658 A1 is a gas burner suitable for use in a domestic central heating boiler which includes a burner head preferably in the form of a ceramic tile having an entry side face and an opposite exit side face. The burner being made of a ceramic material through which a gas and air mixture may pass from the entry side face to the exit side face. The burner includes means for introducing a gas and air mixture to the entry side face of the burner head so that the mixture may pass through the burner head and burn on exiting from the exit side face of the burner head. The burner further includes a baffle plate spaced between and 1.8mm from the entry side face of the burner head, the baffle plate including a plurality of orifices passing there through which are between 1 and 1.3 mm in diameter.

[0005] Document WO 2014/116970 A2 discloses a burner for use with an igniter for firing a flame into a heat-exchanger includes a body having a sidewall that defines an interior chamber. A first opening in the body receives a pre-mixed mixture of air and fuel. A second opening in the body is in fluid communication with the first opening. A distributor connected to the body closes the second opening. The distributor includes a first portion and at least one curved second, portion provided on the first portion. Each second portion includes a plurality of first perforations in fluid communication with the first opening in the body. The first perforations of one second portion are positioned adjacent to the igniter such that ignition of the pre-mix mixture flowing through the first perforations results in a flame through the second portion.

[0006] Document JP 2000 055316 A discloses surface combustion device in which a surface combustion body is constituted of a porous fabric type matter, consisting of the braided matter or the woven matter of fibers made of a heat resistant steel and having high venting property, and a porous reinforcing member, having a high venting property, which are contacted closely to each other, while the surface combustion body is installed at the opening part of the metallic easing so that the reinforcing member is positioned at the side of the box type metallic casing and a first porous dispersing plate, having a porosity of half of that of the fabric matter and the reinforcing member, is installed in the box type metallic easing at the upstream side of the reinforcing member.

[0007] Document WO 2017/194395 A1 discloses a cylindrical gas premix burner which comprises a cylindrical burner deck onto which the flames are stabilized when the burner is in use, a mixing chamber inside the cylindrical burner deck, an inlet device mounted perpendicularly to the axial direction of the cylindrical burner deck for the supply of premix gas into the mixing chamber, and an end cap closing off the mixing chamber at the side opposite to the side where the inlet device is provided. The inlet device comprises a perforated metal plate. The perforations in the perforated metal plate are provided for the supply of premix gas into the mixing chamber. The perforated metal plate is dome shaped; such that perforations in the perforated metal plate arc located at different height levels from the base of the cylindrical burner deck.
The purpose of the invention is to develop such a burner unit structure which will allow to reduce substantially the noise which is generated by the burner in operation.

[0008] The gas burner unit intended for a heat exchanger, having a perforated burner wall and an air and fuel duct in which, over the perforated burner wall, there is a transverse baffle featuring holes and dividing the air and fuel duct into two segments, where the baffle is shaped so that the cross section of the segment of the air and fuel duct located between the baffle and the perforated burner wall increases along the baffle towards the perforated burner wall, and the baffle is positioned in the air and fuel duct so that the cross section of the segment of the air and fuel duct located within the inner space-delimited by the baffle increases towards the perforated burner wall, according to the invention is that the total area of the holes in the baffle accounts for 0.3 to 1.2 of the area of the opening of the fan used to supply the air and fuel mix to the air and fuel duct, the gas burner unit comprises a burner plate to which the baffle, air and fuel duct, and perforated wall of the burner are fixed, wherein the baffle is fitted with a mounting flange used to screw the baffle to the burner plate, and the baffle is given the shape of the side wall of a cone or truncated cone, closed on the side of the smaller base, or shaped into an open dome, or side wall of a pyramid, or side wall of a truncated pyramid, closed on the side of the smaller base.

[0009] Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

[0010] In the drawings:

Fig. 1 shows the cross section of the burner unit with visible baffle in the shape of the side wall of a cone, in axonometric view;

Fig. 2 depicts the baffle in the shape of the side wall of a cone with round holes and mounting flange, in axonometric view;

Fig. 3 shows the baffle as in Fig. 2, in side view;

Fig. 4 depicts the baffle as in Fig. 2, in bird's eye view;

Fig. 5 shows the baffle in the shape of the side wall of a truncated cone with rectangular holes, closed on the side of the smaller base, featuring a mounting flange on the side of the larger base, in axonometric view;

Fig. 6 presents the baffle as in Fig. 5, in side view;

Fig. 7 depicts the baffle as in Fig. 5, in bird's eye view;

Fig. 8 shows the baffle in the shape of an open dome with square holes, in axonometric view;

Fig. 9 depicts the baffle as in Fig. 8, in side view;

Fig. 10 presents the baffle as in Fig. 8, in bird's eye view;

Fig. 11 depicts the baffle in the shape of the side wall of a truncated pyramid with round holes, closed on the side of the smaller base, in axonometric view;

Fig. 12 presents the baffle as in Fig. 11, in side view;

Fig. 13 shows the baffle as in Fig. 11, in bird's eye view.

[0011] In the first exemplary embodiment of the invention (Fig. 1 to Fig. 4), the gas burner unit intended for a heat exchanger incorporates a perforated wall 1 of the burner, air and fuel duct 2, where there is a transverse baffle 3 over the perforated wall 1 of the burner, and further includes the plate 6 of the burner. Fixed to the plate 6 of the burner is the baffle 3, air and fuel duct 2, and perforated wall 1 of the burner. The baffle 3 is given the shape of the side wall of a cone hollow inside (Fig. 2 to Fig. 4), where the apex of the cone points in the direction opposite to the perforated wall 1 of the burner and divides the air and fuel duct 2 into two segments: the segment under the baffle 3 and the one over the baffle 3. The cross section of the segment of the air and fuel duct 2 located within the inner space delimited by the baffle 3 increases towards the perforated wall 1 of the burner. The baffle 3 features round holes 4 through which the air and fuel mix is supplied to the perforated wall 1 of the burner, as well as a mounting flange 5 used to screw the baffle 3 to the plate 6 of the burner.

[0012] In the second exemplary embodiment of the invention, the burner unit described in the first example incorporates the baffle 3 in the shape of the side wall of a truncated cone (Fig. 5 to Fig. 7) closed with a wall on the side of the smaller base, where the baffle is oriented in the direction opposite to the perforated wall 1 of the burner and divides the air and fuel duct 2 into two segments: the segment under the baffle 3 and the one over the baffle 3. The cross section of the segment of the air and fuel duct 2 located within the inner space delimited by the baffle 3 increases towards the perforated wall 1 of the burner. The baffle 3 features rectangular holes 4 arranged axially, and is fitted with a mounting flange 5 used to screw the baffle 3 to the burner plate 6.

[0013] In the third exemplary embodiment the burner unit described in example 1 incorporates the baffle 3 in the shape of an open dome (Fig. 8 to Fig. 10), oriented in the direction opposite to the perforated wall 1 of the burner, where the baffle divides the air and fuel duct 2 into two segments: the segment under the baffle 3 and the one over the baffle 3. The cross section of the segment of the air and fuel duct 2 located within the inner space delimited by the baffle 3 increases towards the perforated wall 1 of the burner. The baffle 3 features square holes 4. The baffle 3 is welded to the burner plate 6.

[0014] In the fourth exemplary embodiment the burner unit described in embodiment one incorporates the baffle 3 in the shape of the side wall of a truncated pyramid (Fig. 11 to Fig. 13) closed with a wall on the side of the smaller base, where the baffle is oriented in the direction opposite to the perforated wall 1 of the burner and divides the air and fuel duct 2 into two segments: the segment under the baffle 3 and the one above the baffle 3. The cross section of the segment of the air and fuel duct 2 located within the inner space delimited by the baffle 3 increases towards the perforated wall 1 of the burner. The baffle 3 features round holes 4. The baffle 3 is welded to the burner plate 6.

[0015] In all embodiments of the invention the total area of the holes 4 in the baffle 3 accounts for 0.3 to 1.2 of the area of the opening of the fan used to supply the air and fuel mix to the air and fuel duct 2.

[0016] The air and fuel mix is supplied via the air and fuel duct 3 to the perforated wall 1 of the burner through the holes 4 in the baffle 3. The shape of the baffle 3 and its positioning in the air and fuel duct 2 according to the invention ensures substantial reduction of noise accompanying the work of the burner unit.

Claims

1. A gas burner unit intended for a heat exchanger, having a perforated burner wall and an air and fuel duct and a fan used to supply an air and fuel mixture to the air and fuel duct, in which air and fuel duct (2), over the perforated burner wall (1), there is a transverse baffle (3) featuring holes (4) and dividing the air and fuel duct (2) into two segments, wherein the baffle is shaped so that the cross section of the segment of the air and fuel duct (2) located between the baffle (3) and perforated burner wall (1) increases along the baffle (3) towards the perforated burner wall (1), wherein the baffle (3) is positioned in the air and fuel duct (2) so that the cross section of the segment of the air and fuel duct (2) located within the inner space delimited by the baffle (3) increases towards the perforated burner wall (1), and wherein the total area of the holes (4) in the baffle (3) accounts for 0.3 to 1.2 of the area of the opening of the fan used to supply the air and fuel mix to the air and fuel duct (2), wherein the gas burner unit further comprises a burner plate (6) to which said baffle (3), air and fuel duct (2), and perforated wall (1) of the burner are fixed, wherein the baffle (3) is fitted with a mounting flange (5) used to screw the baffle (3) to the burner plate (6), and the baffle (3) is given the shape of the side wall of a cone or truncated cone, closed on the side of the smaller base, or shaped into an open dome, or side wall of a pyramid, or side wall of a truncated pyramid, closed on the side of the smaller base.

Ansprüche

1. Eine Gasbrennereinheit für einen Wärmetauscher mit einer perforierten Brennerwand und einer Luft-Brennstoff-Leitung und mit einem Gebläse zur Zufuhrung des Luft-Brennstoff-Gemisches in die Luft-Brennstoff-Leitung, wo in der Luft-Brennstoff-Leitung (2) oberhalb der perforierten Wand (1) des Brenners eine mit Perforierungen (4) versehene querliegende Trennwand (3) eingebaut ist, die die Luft-Brennstoff-Leitung (2) in zwei Teile aufteilt, wobei die Trennwand so gestaltet ist, dass der Querschnitt des zwischen der Trennwand (3) und der perforierten Wand (1) des Brenners liegenden Teils der Luft-Brennstoff-Leitung (2) sich entlang der Trennwand (3) in die Richtung der perforierten Wand (1) des Brenners vergrößert, wobei die Trennwand (3) in der Luft-Brennstoff-Leitung (2) so angeordnet ist, dass der Querschnitt des Teils der Luft-Brennstoff-Leitung (2), der innerhalb des Trennwandbereichs (3) liegt, in Richtung der perforierten Wand (1) des Brenners zunimmt, wobei die Gesamtfläche der Perforierung (4) in der Trennwand (3) 0,3 bis 1,2 der Öffnungsoberfläche des Gebläses zur Zuführung des Luft-Brennstoff-Gemischs in die Luft-Brennstoff-Leitting (2) beträgt, wobei die Brennereinheit darüber hinaus eine Platte (6) des Brenners umfasst, an der die genannte Trennwand (3), die Luft-Brennstoff-Leitung (2) und die perforierte Wand (1) des Brenners befestigt sind, wobei die Trennwand (3) mit einem Montageflansch (5) zur Befestigung der Trennwand (3) an der Platte (6) des Brenners ausgestattet ist und die Trennwand (3) eine Form des Kegelmantels oder Mantels eines an der kleineren Grundfläche abgeschnittenen Kegels oder Form einer offenen Kuppel oder eines Pyramidenmantels oder Mantels der an der kleineren Grundfläche abgeschnittenen Pyramide hat.

Revendications

1. Ensemble de brûleur à gaz pour un échangeur de chaleur comprenant une paroi de brûleur perforée et un conduit air/carburant et un ventilateur pour fournir le mélange air/carburant dans le conduit air/carburant, dans ledit conduit air-carburant (2), au-dessus de la paroi perforée (1) du brûleur, est situé un cloisonnement transversal (3) pourvu d'ouvertures (4) et divisant la conduite air-carburant (2) en deux parties, le cloisonnement étant formé de telle sorte que la section transversale de la partie du conduit air-carburant (2), située entre le cloisonnement (3) et la paroi perforée (1) du brûleur augmente le long du cloisonnement (3) vers la paroi perforée (1) du brûleur, le cloisonnement (3) étant disposé dans le conduit air-carburant (2) de telle sorte que la section transversale de la partie du conduit air-carburant (2), située dans la zone de l'intérieur du cloisonnement (3) augmente vers la paroi perforée (1) du brûleur, et dans lequel la surface totale des ouvertures (4) du cloisonnement (3) est de 0,3 à 1,2 de la surface de l'ouverture du ventilateur prévu pour fournir le mélange air-carburant dans le conduit air-carburant (2), l'ensemble de brûleur comprenant en outre une plaque de brûleur (6) à laquelle sont fixés ledit cloisonnement (3), le conduit air-carburant (2) et la paroi perforée (1) de brûleur, le cloisonnement (3) étant équipé d'une bride de montage (5) pour visser le cloisonnement (3) sur la plaque (6) du brûleur, le cloisonnement (3) ayant la forme d'une surface conique ou d'une surface tronconique fermée du côté de la plus petite base, ou la forme d'un dôme ouvert, ou de la surface des faces latérales d'une pyramide, ou de la surface des faces latérales d'une pyramide tronquée fermée du côté de la base plus petite.

Drawing