WO2019138146A1 - Mixer device for a gas burner - Google Patents

Mixer device for a gas burner Download PDF

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Publication number
WO2019138146A1
WO2019138146A1 PCT/ES2018/070838 ES2018070838W WO2019138146A1 WO 2019138146 A1 WO2019138146 A1 WO 2019138146A1 ES 2018070838 W ES2018070838 W ES 2018070838W WO 2019138146 A1 WO2019138146 A1 WO 2019138146A1
Authority
WO
WIPO (PCT)
Prior art keywords
membrane
main
channel
mixing device
gas
Prior art date
Application number
PCT/ES2018/070838
Other languages
Spanish (es)
French (fr)
Inventor
Mikel OCAÑA SOLA
Aimar ARIN GUTIERREZ
Original Assignee
Orkli, S.Coop.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Orkli, S.Coop. filed Critical Orkli, S.Coop.
Priority to KR2020207000040U priority Critical patent/KR200497783Y1/en
Priority to CN201890001457.6U priority patent/CN212930063U/en
Publication of WO2019138146A1 publication Critical patent/WO2019138146A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L3/00—Arrangements of valves or dampers before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation

Definitions

  • the present invention relates to premix gas burners and to the mixing devices of said burners.
  • the fuel used is generally natural gas, butane or propane. Said fuel is mixed with a oxidizing gas, generally air, and by means of a spark the flame is ignited.
  • Premix gas burners are fed by a homogeneous mixture of a combustion gas and a combustible gas. This mixture is produced upstream of the means that generate the spark necessary to ignite the flame.
  • This type of burner usually comprises a chamber or a mixing device where said oxidizing gas and said combustible gas are mixed before going to the exit point, that is to the point of ignition where the flame is produced.
  • US20110139045A1 describes a premix gas burner comprising a mixing device.
  • Said mixing device comprises a main body comprising an air intake duct (oxidizing gas) and an intake duct for a combustible gas.
  • the main body comprises a main channel, arranged next to the combustion gas inlet duct, which in a strangulated area is divided into two channels.
  • Each channel is connected to the gas inlet duct fuel through a fuel gas distribution channel, therefore, the fuel gas is sucked and mixed with the air passing through said strangled zone in both channels.
  • One of the channels comprises an opening and closing element to regulate the flow of the mixture.
  • the object of the invention is to provide a mixing device for a gas burner, as defined in the claims.
  • the mixing device of the invention comprises a main body comprising a combustion gas inlet conduit, preferably air, and a combustible gas inlet conduit.
  • the main body also comprises a main channel that is communicated with the combustion gas inlet duct so that a narrowing of the flow of the combustion gas occurs as it is forced to circulate through said main channel.
  • the main channel is connected to the fuel gas inlet duct through a fuel gas distribution channel, the mixture of the fuel gas and the oxidizing gas in said main channel being propitiated.
  • the main body also comprises an auxiliary channel communicated with the combustion gas inlet conduit, said auxiliary channel being arranged in the contour of the main channel, and an additional distribution channel communicated with the fuel gas inlet conduit, said channel being arranged of additional distribution close to the auxiliary channel.
  • the mixing device also comprises a flexible membrane that is fixed to the main body and that in a rest position rests on the auxiliary channel and the additional distribution channel by sealing both channels.
  • the membrane is configured to move by the action of the flow of the oxidizing gas that arrives through the combustion inlet duct when said flow exceeds a certain threshold, allowing the passage of combustion gas through the auxiliary channel and the passage of combustible gas to through the additional distribution channel.
  • the mixing device of the invention it is possible to regulate the flow rate of the mixture of combustion gas and combustible gas of the gas burner of the invention to vary the power of the burner in a simple, reliable and economical way.
  • the membrane thanks to the membrane the opening of the auxiliary channel, to allow the passage of the oxidizing gas, and of the additional distribution channel, to allow the passage of combustible gas, is gradual, which also allows a gradual variation of the pneumatic signal which controls the valve that manages the passage of fuel gas into the distribution channel and the additional fuel gas distribution channel.
  • the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, thereby achieving that the CO2 emission curve keep constant throughout the modulation range (regulation), avoiding the peaks that would be generated in case of a sharp opening of rigid opening and closing means.
  • the mixing device by dispensing with dynamic mechanical elements, is more robust and reliable, since it does not need any maintenance.
  • Figure 1 shows a perspective view of the mixing device according to an embodiment of the invention.
  • Figure 2 shows a plan view of the mixing device of Figure 1.
  • Figure 3 shows another perspective view of the mixing device of Figure 1 but with a sectioned portion.
  • Figure 4 shows a sectional view of the mixing device of Figure 1.
  • Figure 5 shows the membrane of the mixing device of Figure 1.
  • Figure 6 shows a detail of the mixing device of Figure 1.
  • Figure 7 shows a second embodiment of the membrane of the mixing device according to the invention.
  • Figure 8A shows a third embodiment of the membrane of the mixing device according to the invention.
  • Figure 8B shows the rear view of the membrane of Figure 8A.
  • Figure 9 shows a fourth embodiment of the membrane of the mixing device according to the invention.
  • Figure 1 shows the mixing device 1 according to a preferred embodiment of the invention.
  • the mixing device 1 comprises a main body 1a comprising an inlet duct 2 for a combustion gas, preferably air, and an inlet duct 3 for a combustible gas.
  • the main body 1 a also comprises a main channel 4 which is communicated with the inlet duct 2 of the oxidizing gas so that a narrowing of the flow of the oxidizing gas occurs when being forced to circulate through said main channel 4.
  • the main channel 4 it is communicated with the inlet conduit 3 of the fuel gas, as shown in figure 3, through a fuel gas distribution channel 3.1, the mixture of the fuel gas and the oxidizing gas in said main channel 4.
  • Main channel 4 in the preferred embodiment of the invention is circular, as shown in the drawings, but other shapes are not ruled out.
  • the main body 1a also comprises an auxiliary channel 5 communicated with the inlet duct 2 of the oxidizing gas, said auxiliary channel 5 being arranged in the contour of the main channel 4, and an additional distribution channel 3.2 communicated with the inlet conduit 3 of the fuel gas, said additional distribution channel 3.2 being arranged near the auxiliary channel 5.
  • the mixing device 1 also comprises a flexible membrane 6, at least a portion of said membrane 6 being fixed to the main body 1a, which in a rest position it rests on the auxiliary channel 5 and the additional distribution channel 3.2 by blocking both channels 5 and 3.2.
  • the membrane 6 is configured to move by the action of the flow of the oxidizing gas that arrives through the inlet duct 2 of the oxidizer when said flow exceeds a certain threshold value, allowing the passage of combustion gas through the auxiliary channel 5 and the passage of combustible gas through the additional distribution channel 3.2.
  • the mixing device 1 of the invention it is possible to regulate the flow rate of the mixture of combustion gas and combustible gas in a simple, reliable and economical manner. Therefore, the regulation of the power of the burner of the invention is also carried out safely and reliably, being possible to achieve a regulation or modulation of power of at least 1 to 10. Also, thanks to the membrane 6 the opening of the Auxiliary channel 5, to allow the passage of the oxidizing gas, and of the additional distribution channel 3.2, to allow the passage of combustible gas, is gradual which also allows a gradual variation of the pneumatic signal commanded by a valve that manages the passage of the fuel gas to distribution channel 3.1 and additional distribution channel 3.2 for combustible gas.
  • Said pneumatic signal is the pressure difference between the pressure of the flow of the combustion gas at the inlet of the inlet duct 2 and the flow of the combustion gas for example at the height where it meets the combustible gas in the main channel 4 and / or of the additional distribution channel 3.2.
  • the strangled area of the mixing device 1 caused by the main channel 4 and by the additional distribution channel 3.2 decreases as the flow of oxidizing gas increases (as the passage section is increased total of the oxidizing gas), and combustible gas, and therefore also gradually increasing the power of the burner.
  • the flexible membrane 6 of the invention which, as the person skilled in the art knows is a small thickness element, is effective even in the case of small variations in the flow of the oxidizing gas, thus allowing the pneumatic signal to be maintained sufficient to command said valve effectively and gradually.
  • the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, thereby achieving that the CO2 emission curve remain constant throughout the modulation range (regulation), avoiding the peaks that they would be generated in case of abrupt opening of rigid opening and closing means.
  • the mixing device 1 a bypassing dynamic mechanical elements is more robust and reliable, since it does not need any maintenance. In addition, its manufacture and assembly are much easier due mainly to the absence of mechanical parts.
  • the main body 1a according to the preferred embodiment of the invention comprises a main opening 10, preferably arranged centered with respect to the axial axis of the main body 1 a, and a main tube 9 disposed in said main opening 10.
  • the main tube 9 comprises therein the main channel 4, as can be seen in the drawings (see, for example, figure 3 or 4), causing a throttling that favors the Venturi effect when the oxidizing gas from the inlet duct 2 is forced to pass through said main channel 4 of minor section.
  • the main opening 10 comprises the auxiliary channel 5, as can be seen in the drawings (see, for example, figure 2 or 3), also providing a throttle that favors the Venturi effect when the oxidizing gas from the duct input 2 is forced to pass through said auxiliary channel 5 of smaller section if it is open, that is, if it is not obstructed by the membrane 6.
  • the main body 1 a according to the preferred embodiment of the invention comprises a perimeter groove 11 arranged close to the main opening 10, as seen in Figures 3 and 4, the additional distribution channel 3.2 comprising said perimeter groove 1 1.
  • the perimeter groove 11 surrounds the auxiliary channel 5, said perimeter groove 11 and said auxiliary channel 5 being separated by a separation wall 8, the main opening 10 being contained within the interior of said separation wall 8.
  • the perimeter groove 11, the main opening 10 and the main tube 9 are coaxial.
  • the main body 1 a comprises at least one support arm 12.1 that joins the main tube 9 with the contour of the main opening 10, the fuel gas distribution channel 3.1 reaching the main channel 4 of the main tube 9 through one of said support arms 12.1, as shown in figures 3 and 4.
  • the distribution channel 3.1 is a linear channel of preferably circular section that communicates with the main channel 4 approximately halfway up of said main channel 4.
  • the main body 1 a comprises a second support arm 12.1 aligned with the first support arm 12.1, the main tube 9 being arranged between both support arms 12.1.
  • the membrane 6 according to the preferred embodiment of the invention comprises a central opening 6.4 to allow the passage of the main tube 9, as shown in Figure 1, the membrane 6 being fixed to said main tube 9 in the preferred embodiment of the invention, as will be detailed later.
  • the membrane 6 comprises two wings 6.3, one on each side of the support arms 12.1, said wings 6.3 being supported on said support arms 12.1 so that each wing 6.3 can move, pivoting with respect to the zones fixed to the main body 1a, pushed by the flow of the oxidizer when said flow exceeds a certain threshold value, opening the passage of the auxiliary channel 5 and the additional distribution channel 3.2.
  • the membrane 6 returns to the rest position, the wings 6.3 again blocking the auxiliary channel 5 and the additional distribution channel 3.2.
  • the wings 6.3 can also be fixed to the support arms 12.1.
  • the flow of the oxidizer is regulated by means of ventilation of the gas burner.
  • the default gas burner is regulated to work at low power, that is, so that the membrane 6 is in the rest position, feeding the burner head only with the combustion gas / fuel mixture from the main channel 4.
  • the wings 6.3 will be raised by opening the auxiliary channel 5 and the additional distribution channel 3.2, thus increasing the flow of the oxidizing gas / fuel mixture.
  • the wings 6.3 will open more or less depending on the flow of the oxidizer, that is, depending on the power of the ventilation means.
  • the opening of the wings 6.3 of the membrane 6 is gradual, it is also possible to gradually regulate the valve that manages the passage of the combustible gas, as already explained above. Therefore, the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, whereby the emission curve of C0 is achieved 2 remain constant throughout the modulation range (regulation), avoiding the peaks that would be generated in case of abrupt opening of rigid opening and closing means.
  • the combustion gas and the combustible gas pass to an outlet duct 13 comprised in the main body 1 a and then disposed of the main channel 4, the auxiliary channel 5 and the additional distribution channel 3.2.
  • Said outlet duct 13 is connected to a distributor, not shown in the drawings, which helps distribute and direct said mixture to the burner head so that the corresponding flame is produced in the presence of a spark.
  • the membrane 6, also comprises a support face 6.1, arranged on the back of the membrane 6, which comprises a flat surface that in the rest position rests on the auxiliary channel 5 and the additional distribution 3.2 plugging both channels 5 and 3.2, and an outer face 6.2, disposed on the obverse of the membrane 6, comprising at least one reinforcing rib 7 protruding from said outer face 6.2, as shown for example in Figure 1
  • the support face 6.1 of the membrane 6 in the rest position rests on the outer surface of the support arms 12.1, the outer surface of the separation wall 8, and a third support surface 12.3 extending radially from the additional distribution channel 3.2, preferably being the membrane 6 fixed to the main body 1 around the main tube 9 and the support arms 12.1.
  • the outer surfaces of the support arms 12.1 and the separation wall 8 and said third support surface 12.3 are at the same level.
  • the support face 6.1 of the membrane 6 can comprise a perimeter lip, preferably arranged next to the flat face to favor the sealing of the auxiliary channel 5 and the additional distribution channel 3.2.
  • Said perimeter lip may be supported, for example, on the third bearing surface 12.3 when the membrane 6 is in the rest position.
  • the membrane 6 according to the preferred embodiment of the invention comprises a plurality of radial reinforcement ribs 7, as can be seen in Figure 1.
  • the membrane 6 can also comprise at least one diametral reinforcement rib 7 ', which may be said reinforcement rib 7 'divided into several portions.
  • the reinforcing ribs 7 and 7 prevent the wings 6.3 from oscillating, that is to say that they have a reciprocating movement, when said wings 6.3 are moved away from the resting position pushed by the flow of the oxidizing gas.
  • the wings 6.3 are symmetrical, in this way the forces necessary to move said wings 6.3 from the resting position are balanced, whereby the wings 6.3 will move simultaneously.
  • FIG. 7 A second embodiment of the membrane 6 is shown in Fig. 7.
  • This membrane 6 also comprises two wings 6.3 and all the features described above, but unlike the membrane 6 of the first embodiment, said wings 6.3 are contained in a flange 6.5 perimeter, said flange 6.5 supported and additionally fixed on the third support surface 12.3 of the main body 1 a. This configuration allows a greater fixation of the membrane 6 to the main body 1 a.
  • the membrane 6 is cup-shaped, as shown in Figures 8A and 8B.
  • the outer circumferential wall 6.6 of said bowl and / or the upper flange 6.7 is fixed to the main body 1 a, preferably to the inner wall of the outlet duct 13.
  • the membrane 6 of this embodiment preferably comprises four wings 6.3 arranged in the base of the bowl that opens and closes from the main tube 9, depending on the flow of oxidizing gas that arrives through the inlet duct 2, as already explained above.
  • the partition of these four wings 6.3 forms a cross, said cross being preferably arranged so that it does not coincide with the support arms 12.1 of the main body 1a, that is to say so that neither side of the cross coincides or is aligned with the support arms 12.1.
  • the bowl-shaped membrane 6 may comprise a diametral reinforcing rib 7 'arranged near the main tube 9, that is to say near the edge of the central opening 6.4 of the membrane 6 itself, which is divided into several portions, preferably a for each wing 6.3, as shown in Figure 9, which shows a fourth embodiment of the membrane 6.
  • this membrane 6 can also comprise more diametric and / or radial reinforcement ribs 7 ’.
  • the wings 6.3 are also symmetrical so that the forces necessary to move said wings 6.3 away from the resting position are also balanced so that they move simultaneously.
  • the membrane 6 (according to any of the described embodiments) is fixed to the main body 1a by overmolding, thus obtaining a compact and robust mixing device 1 with a simple and economical design.
  • the junction zones between the membrane 6 and the main body 1 a correspond to the fixing zones described for each embodiment.
  • the membrane 6 of the invention can also be fixed to the main body 1a, in the fixing areas described for each embodiment, by ultrasound, by welding or by the application of an adhesive.
  • part of the main body 1a could be deformed to trap at least a portion of the membrane 6, once the membrane 6 has been arranged in the final position, trapping at least a portion of the membrane 6.
  • the main tube of the main body 1a is deformed by trapping the edge of the central opening 6.4 of the membrane 6.
  • the main tube 9, comprises a flat face 15 arranged at least on one side cooperating with a corresponding flat face of the membrane 6 arranged in the central opening 6.4, as shown in the figure 7, to ensure the correct placement of the membrane 6 of the invention on the main body 1 a of the mixing device 1.
  • the main tube 9 can comprise two flat faces 15 arranged on two opposite sides, each cooperating with a corresponding flat face 15 ’of the membrane 6, arranged facing each other in the central opening 6.4, to facilitate its assembly.
  • the membrane 6 of the invention is made of silicone, EPDM or NBR (nitrile butadiene) and the main body 1a of the mixing device 1 is made of rigid plastic, preferably polyamide, or metal.
  • the C02 emission curve of the gas burner is kept constant throughout the entire modulation range, that is to say of regulation, avoiding the peaks that would be generated in case of an abrupt opening and closing of the channel auxiliary 5 and additional distribution channel 3.2.
  • rigid opening and closing means were used instead of the flexible membrane 6, as in the case of US20110139045A1, said opening, and also the closing, would be immediate, whereby in a relatively short time the variation of the gas fuel and combustion gas before the opening of the additional distribution channel 3.2 and the auxiliary channel 5, and just after the opening would be elevated giving rise to said unwanted peaks.
  • the main body 1a of the mixing device 1 comprises fixing means, preferably a plurality of holes 14 arranged diametrically as can be seen, for example, in Figure 1, to allow the mixing device 1 to be attached to the gas burner.
  • the combustion gas used in the burner and the mixing device 1 of the invention is air and the combustion gas can be natural gas, butane or propane.
  • the invention also relates to a gas burner comprising the mixing device of the invention.

Abstract

Mixer device (1) comprising a main body (1a) with an oxidizing gas inlet duct (2), a combustible gas inlet duct (3) and a main channel (4) connected to both inlet ducts (2, 3). The main body (1a) also comprises an auxiliary channel, connected to the oxidizing gas inlet duct (2), and an additional distribution channel, connected to the combustible gas inlet duct (3), both channels being blocked by a membrane (6) when in a standby position, and allowing the passage of the oxidizing gas and combustible gas through the corresponding channels when said membrane (6) is moved by the action of the oxidizing gas flow upon exceeding a specific threshold.

Description

DESCRIPCIÓN  DESCRIPTION
Dispositivo mezclador para un quemador de gas Mixing device for a gas burner
SECTOR DE LA TÉCNICA SECTOR OF THE TECHNIQUE
La presente invención se relaciona con quemadores de gas de premezcla y con los dispositivos de mezclado de dichos quemadores. The present invention relates to premix gas burners and to the mixing devices of said burners.
ESTADO ANTERIOR DE LA TÉCNICA PREVIOUS STATE OF THE TECHNIQUE
En los quemadores de gas el combustible usado es generalmente gas natural, butano o propano. Dicho combustible es mezclado con un gas comburente, generalmente aire, y mediante una chispa se prende la llama. In gas burners the fuel used is generally natural gas, butane or propane. Said fuel is mixed with a oxidizing gas, generally air, and by means of a spark the flame is ignited.
Los quemadores de gas de premezcla son alimentados por una mezcla homogénea de un gas comburente y de un gas combustible. Esta mezcla se produce aguas arriba de los medios que generan la chispa necesaria para prender la llama. Premix gas burners are fed by a homogeneous mixture of a combustion gas and a combustible gas. This mixture is produced upstream of the means that generate the spark necessary to ignite the flame.
Este tipo de quemadores suelen comprender una cámara o un dispositivo de mezclado donde dicho gas comburente y dicho gas combustible son mezclados antes de dirigirse al punto de salida, es decir al punto de ignición donde se produce la llama. This type of burner usually comprises a chamber or a mixing device where said oxidizing gas and said combustible gas are mixed before going to the exit point, that is to the point of ignition where the flame is produced.
En los dispositivos de mezclado de este tipo de quemadores el gas combustible es succionado por el gas comburente debido al efecto Venturi y éstos dos gases son mezclados debido a las turbulencias generadas. In the mixing devices of this type of burners the combustible gas is sucked by the oxidizing gas due to the Venturi effect and these two gases are mixed due to the turbulence generated.
US20110139045A1 describe un quemador de gas de premezcla que comprende un dispositivo mezclador. Dicho dispositivo mezclador comprende un cuerpo principal que comprende un conducto de entrada para el aire (gas comburente) y un conducto de entrada para un gas combustible. El cuerpo principal comprende un canal principal, dispuesto a continuación del conducto de entrada del gas comburente, que en una zona estrangulada se divide en dos canales. Cada canal está comunicado con el conducto de entrada del gas combustible a través de un canal de distribución de gas combustible, por lo tanto, el gas combustible es succionado y mezclado con el aire que pasa por dicha zona estrangulada en ambos canales. Uno de los canales comprende un elemento de apertura y cierre para regular el caudal de la mezcla. US20110139045A1 describes a premix gas burner comprising a mixing device. Said mixing device comprises a main body comprising an air intake duct (oxidizing gas) and an intake duct for a combustible gas. The main body comprises a main channel, arranged next to the combustion gas inlet duct, which in a strangulated area is divided into two channels. Each channel is connected to the gas inlet duct fuel through a fuel gas distribution channel, therefore, the fuel gas is sucked and mixed with the air passing through said strangled zone in both channels. One of the channels comprises an opening and closing element to regulate the flow of the mixture.
EXPOSICIÓN DE LA INVENCIÓN EXHIBITION OF THE INVENTION
El objeto de la invención es el de proporcionar un dispositivo mezclador para un quemador de gas, tal y como se define en las reivindicaciones. The object of the invention is to provide a mixing device for a gas burner, as defined in the claims.
El dispositivo mezclador de la invención comprende un cuerpo principal que comprende un conducto de entrada de gas comburente, preferentemente aire, y un conducto de entrada de gas combustible. El cuerpo principal también comprende un canal principal que está comunicado con el conducto de entrada de gas comburente de forma que se produce un estrechamiento del flujo del gas comburente al ser obligado a circular por dicho canal principal. El canal principal está comunicado con el conducto de entrada del gas combustible a través de un canal de distribución de gas combustible, propiciándose la mezcla del gas combustible y el gas comburente en dicho canal principal. The mixing device of the invention comprises a main body comprising a combustion gas inlet conduit, preferably air, and a combustible gas inlet conduit. The main body also comprises a main channel that is communicated with the combustion gas inlet duct so that a narrowing of the flow of the combustion gas occurs as it is forced to circulate through said main channel. The main channel is connected to the fuel gas inlet duct through a fuel gas distribution channel, the mixture of the fuel gas and the oxidizing gas in said main channel being propitiated.
El cuerpo principal también comprende un canal auxiliar comunicado con el conducto de entrada del gas comburente, estando dispuesto dicho canal auxiliar en el contorno del canal principal, y un canal de distribución adicional comunicado con el conducto de entrada del gas combustible, estando dispuesto dicho canal de distribución adicional próximo al canal auxiliar. The main body also comprises an auxiliary channel communicated with the combustion gas inlet conduit, said auxiliary channel being arranged in the contour of the main channel, and an additional distribution channel communicated with the fuel gas inlet conduit, said channel being arranged of additional distribution close to the auxiliary channel.
El dispositivo mezclador también comprende una membrana flexible que está fijada al cuerpo principal y que en una posición de reposo se apoya sobre el canal auxiliar y el canal de distribución adicional obturando ambos canales. La membrana está configurada para moverse por la acción del flujo del gas comburente que llega a través del conducto de entrada del comburente cuando dicho flujo supera un determinado umbral, permitiendo el paso de gas comburente a través del canal auxiliar y el paso de gas combustible a través del canal de distribución adicional. The mixing device also comprises a flexible membrane that is fixed to the main body and that in a rest position rests on the auxiliary channel and the additional distribution channel by sealing both channels. The membrane is configured to move by the action of the flow of the oxidizing gas that arrives through the combustion inlet duct when said flow exceeds a certain threshold, allowing the passage of combustion gas through the auxiliary channel and the passage of combustible gas to through the additional distribution channel.
Con el dispositivo mezclador de la invención es posible regular el caudal de la mezcla de gas comburente y gas combustible del quemador de gas de la invención para variar la potencia del quemador de una manera sencilla, fiable y económica. Así mismo, gracias a la membrana la apertura del canal auxiliar, para permitir el paso del gas comburente, y del canal de distribución adicional, para permitir el paso de gas combustible, es gradual, lo que permite una variación también gradual de la señal neumática que comanda la válvula que gestiona el paso del gas combustible hacia el canal de distribución y el canal de distribución adicional de gas combustible. Por lo tanto, la regulación de la cantidad de gas combustible necesaria para asegurar una mezcla homogénea en base a la entrada de la cantidad de gas comburente se realiza de una manera exacta y precisa, con lo cual se consigue que la curva de emisiones de CO2 se mantenga constante en todo el rango de modulación (regulación), evitándose los picos que se generarían en caso de una apertura brusca de unos medios de apertura y cierre rígidos. With the mixing device of the invention it is possible to regulate the flow rate of the mixture of combustion gas and combustible gas of the gas burner of the invention to vary the power of the burner in a simple, reliable and economical way. Likewise, thanks to the membrane the opening of the auxiliary channel, to allow the passage of the oxidizing gas, and of the additional distribution channel, to allow the passage of combustible gas, is gradual, which also allows a gradual variation of the pneumatic signal which controls the valve that manages the passage of fuel gas into the distribution channel and the additional fuel gas distribution channel. Therefore, the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, thereby achieving that the CO2 emission curve keep constant throughout the modulation range (regulation), avoiding the peaks that would be generated in case of a sharp opening of rigid opening and closing means.
Así mismo, el dispositivo mezclador, al prescindir de elementos mecánicos dinámicos, es más robusto y fiable, ya que no necesita mantenimiento alguno. Likewise, the mixing device, by dispensing with dynamic mechanical elements, is more robust and reliable, since it does not need any maintenance.
Estas y otras ventajas y características de la invención se harán evidentes a la vista de las figuras y de la descripción detallada de la invención. These and other advantages and features of the invention will become apparent in view of the figures and the detailed description of the invention.
DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS
La figura 1 muestra una vista en perspectiva del dispositivo mezclador según una realización de la invención. Figure 1 shows a perspective view of the mixing device according to an embodiment of the invention.
La figura 2 muestra una vista en planta del dispositivo mezclador de la figura 1. Figure 2 shows a plan view of the mixing device of Figure 1.
La figura 3 muestra otra vista en perspectiva del dispositivo mezclador de la figura 1 pero con una porción seccionada. Figure 3 shows another perspective view of the mixing device of Figure 1 but with a sectioned portion.
La figura 4 muestra una vista seccionada del dispositivo mezclador de la figura 1. Figure 4 shows a sectional view of the mixing device of Figure 1.
La figura 5 muestra la membrana del dispositivo mezclador de la figura 1. Figure 5 shows the membrane of the mixing device of Figure 1.
La figura 6 muestra un detalle del dispositivo mezclador de la figura 1. La figura 7 muestra una segunda realización de la membrana del dispositivo mezclador según la invención. Figure 6 shows a detail of the mixing device of Figure 1. Figure 7 shows a second embodiment of the membrane of the mixing device according to the invention.
La figura 8A muestra una tercera realización de la membrana del dispositivo mezclador según la invención. Figure 8A shows a third embodiment of the membrane of the mixing device according to the invention.
La figura 8B muestra la vista posterior de la membrana de la figura 8A. Figure 8B shows the rear view of the membrane of Figure 8A.
La figura 9 muestra una cuarta realización de la membrana del dispositivo mezclador según la invención. Figure 9 shows a fourth embodiment of the membrane of the mixing device according to the invention.
EXPOSICIÓN DETALLADA DE LA INVENCIÓN DETAILED EXHIBITION OF THE INVENTION
En la figura 1 se muestra el dispositivo mezclador 1 según una realización preferente de la invención. Tal y como se muestra en dicha figura, el dispositivo mezclador 1 comprende un cuerpo principal 1a que comprende un conducto de entrada 2 para un gas comburente, preferentemente aire, y un conducto de entrada 3 para un gas combustible. El cuerpo principal 1 a también comprende un canal principal 4 que está comunicado con el conducto de entrada 2 del gas comburente de forma que se produce un estrechamiento del flujo del gas comburente al ser obligado a circular por dicho canal principal 4. El canal principal 4 está comunicado con el conducto de entrada 3 del gas combustible, tal como se muestra en la figura 3, a través de un canal de distribución 3.1 de gas combustible, propiciándose la mezcla del gas combustible y el gas comburente en dicho canal principal 4. Dicho canal principal 4 en la realización preferentemente de la invención es circular, tal y como se muestra en los dibujos, pero no se descartan otras formas. Figure 1 shows the mixing device 1 according to a preferred embodiment of the invention. As shown in said figure, the mixing device 1 comprises a main body 1a comprising an inlet duct 2 for a combustion gas, preferably air, and an inlet duct 3 for a combustible gas. The main body 1 a also comprises a main channel 4 which is communicated with the inlet duct 2 of the oxidizing gas so that a narrowing of the flow of the oxidizing gas occurs when being forced to circulate through said main channel 4. The main channel 4 it is communicated with the inlet conduit 3 of the fuel gas, as shown in figure 3, through a fuel gas distribution channel 3.1, the mixture of the fuel gas and the oxidizing gas in said main channel 4. Main channel 4 in the preferred embodiment of the invention is circular, as shown in the drawings, but other shapes are not ruled out.
El cuerpo principal 1a también comprende un canal auxiliar 5 comunicado con el conducto de entrada 2 del gas comburente, estando dispuesto dicho canal auxiliar 5 en el contorno del canal principal 4, y un canal de distribución adicional 3.2 comunicado con el conducto de entrada 3 del gas combustible, estando dispuesto dicho canal de distribución adicional 3.2 próximo al canal auxiliar 5. The main body 1a also comprises an auxiliary channel 5 communicated with the inlet duct 2 of the oxidizing gas, said auxiliary channel 5 being arranged in the contour of the main channel 4, and an additional distribution channel 3.2 communicated with the inlet conduit 3 of the fuel gas, said additional distribution channel 3.2 being arranged near the auxiliary channel 5.
El dispositivo mezclador 1 también comprende una membrana 6 flexible, estando al menos una porción de dicha membrana 6 fijada al cuerpo principal 1a, que en una posición de reposo se apoya sobre el canal auxiliar 5 y el canal de distribución adicional 3.2 obturando ambos canales 5 y 3.2. La membrana 6 está configurada para moverse por la acción del flujo del gas comburente que llega a través del conducto de entrada 2 del comburente cuando dicho flujo supera un determinado valor umbral, permitiendo el paso de gas comburente a través del canal auxiliar 5 y el paso de gas combustible a través del canal de distribución adicional 3.2. La apertura de la membrana 6, a partir de que el flujo de gas comburente supere dicho valor umbral, se produce de manera gradual. The mixing device 1 also comprises a flexible membrane 6, at least a portion of said membrane 6 being fixed to the main body 1a, which in a rest position it rests on the auxiliary channel 5 and the additional distribution channel 3.2 by blocking both channels 5 and 3.2. The membrane 6 is configured to move by the action of the flow of the oxidizing gas that arrives through the inlet duct 2 of the oxidizer when said flow exceeds a certain threshold value, allowing the passage of combustion gas through the auxiliary channel 5 and the passage of combustible gas through the additional distribution channel 3.2. The opening of the membrane 6, as soon as the flow of oxidizing gas exceeds said threshold value, occurs gradually.
Con el dispositivo mezclador 1 a de la invención es posible regular el caudal de la mezcla de gas comburente y gas combustible de una manera sencilla, fiable y económica. Por lo tanto, la regulación de la potencia del quemador de la invención también se realiza de forma segura y fiable, siendo posible conseguir una regulación o modulación de potencia de al menos 1 a 10. Así mismo, gracias a la membrana 6 la apertura del canal auxiliar 5, para permitir el paso del gas comburente, y del canal de distribución adicional 3.2, para permitir el paso de gas combustible, es gradual lo que permite una variación también gradual de la señal neumática que comanda una válvula que gestiona el paso del gas combustible hacia el canal de distribución 3.1 y el canal de distribución adicional 3.2 de gas combustible. Dicha señal neumática es la diferencia de presión entre la presión del flujo del gas comburente a la entrada del conducto de entrada 2 y el flujo del gas comburente por ejemplo a la altura donde se encuentra con el gas combustible en el canal principal 4 y/o del canal de distribución adicional 3.2. A medida que la membrana 6 va abriéndose, la zona estrangulada del dispositivo mezclador 1 provocado por el canal principal 4 y por el canal de distribución adicional 3.2 va disminuyendo a medida que aumenta el flujo de gas comburente (ya que se aumenta la sección de paso total del gas comburente), y gas combustible, y por lo tanto aumentando también gradualmente la potencia del quemador. With the mixing device 1 of the invention it is possible to regulate the flow rate of the mixture of combustion gas and combustible gas in a simple, reliable and economical manner. Therefore, the regulation of the power of the burner of the invention is also carried out safely and reliably, being possible to achieve a regulation or modulation of power of at least 1 to 10. Also, thanks to the membrane 6 the opening of the Auxiliary channel 5, to allow the passage of the oxidizing gas, and of the additional distribution channel 3.2, to allow the passage of combustible gas, is gradual which also allows a gradual variation of the pneumatic signal commanded by a valve that manages the passage of the fuel gas to distribution channel 3.1 and additional distribution channel 3.2 for combustible gas. Said pneumatic signal is the pressure difference between the pressure of the flow of the combustion gas at the inlet of the inlet duct 2 and the flow of the combustion gas for example at the height where it meets the combustible gas in the main channel 4 and / or of the additional distribution channel 3.2. As the membrane 6 opens, the strangled area of the mixing device 1 caused by the main channel 4 and by the additional distribution channel 3.2 decreases as the flow of oxidizing gas increases (as the passage section is increased total of the oxidizing gas), and combustible gas, and therefore also gradually increasing the power of the burner.
La membrana 6 flexible de la invención, que tal y como sabe el experto en la materia se trata de un elemento de pequeño espesor, es efectiva incluso ante pequeñas variaciones del caudal del gas comburente, por lo tanto permite mantener la señal neumática suficiente para comandar dicha válvula de manera efectiva y gradual. The flexible membrane 6 of the invention, which, as the person skilled in the art knows is a small thickness element, is effective even in the case of small variations in the flow of the oxidizing gas, thus allowing the pneumatic signal to be maintained sufficient to command said valve effectively and gradually.
Por lo tanto, la regulación de la cantidad de gas combustible necesaria para asegurar una mezcla homogénea en base a la entrada de la cantidad de gas comburente se realiza de una manera exacta y precisa, con lo cual se consigue que la curva de emisiones de CO2 se mantenga constante en todo el rango de modulación (regulación), evitándose los picos que se generarían en caso de una apertura brusca de unos medios de apertura y cierre rígidos. Therefore, the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, thereby achieving that the CO2 emission curve remain constant throughout the modulation range (regulation), avoiding the peaks that they would be generated in case of abrupt opening of rigid opening and closing means.
Así mismo, el dispositivo mezclador 1 a, al prescindir de elementos mecánicos dinámicos es más robusto y fiable, ya que no necesita mantenimiento alguno. Además, su fabricación y montaje resultan mucho más sencillos debido principalmente a la ausencia de partes mecánicas. Likewise, the mixing device 1 a, bypassing dynamic mechanical elements is more robust and reliable, since it does not need any maintenance. In addition, its manufacture and assembly are much easier due mainly to the absence of mechanical parts.
El cuerpo principal 1a según la realización preferente de la invención comprende una apertura principal 10, preferentemente dispuesta centrada respecto al eje axial del cuerpo principal 1 a, y un tubo principal 9 dispuesto en dicha apertura principal 10. El tubo principal 9 comprende en su interior el canal principal 4, tal y como se aprecia en los dibujos (véase por ejemplo la figura 3 o 4), propiciándose una estrangulación que favorece el efecto Venturi cuando el gas comburente proviniente del conducto de entrada 2 es obligado a pasar por dicho canal principal 4 de sección menor. The main body 1a according to the preferred embodiment of the invention comprises a main opening 10, preferably arranged centered with respect to the axial axis of the main body 1 a, and a main tube 9 disposed in said main opening 10. The main tube 9 comprises therein the main channel 4, as can be seen in the drawings (see, for example, figure 3 or 4), causing a throttling that favors the Venturi effect when the oxidizing gas from the inlet duct 2 is forced to pass through said main channel 4 of minor section.
Por otra parte, la apertura principal 10 comprende el canal auxiliar 5, tal y como se aprecia en los dibujos (véase por ejemplo la figura 2 o 3), propiciándose también una estrangulación que favorece el efecto Venturi cuando el gas comburente proviniente del conducto de entrada 2 es obligado a pasar por dicho canal auxiliar 5 de sección menor si éste está abierto, es decir si no está obstruido por la membrana 6. On the other hand, the main opening 10 comprises the auxiliary channel 5, as can be seen in the drawings (see, for example, figure 2 or 3), also providing a throttle that favors the Venturi effect when the oxidizing gas from the duct input 2 is forced to pass through said auxiliary channel 5 of smaller section if it is open, that is, if it is not obstructed by the membrane 6.
La membrana 6, cuando está abierta, es decir cuando no obstruye el canal auxiliar 5 y el canal de distribución adicional 3.2, rompe el flujo laminar del gas comburente que entra en el canal auxiliar 5, provocando un regimen turbulento que mejora la efectividad de la mezcla gas comburente/combustible, mejorando las prestaciones en lo relativo a emisiones de CO2. del quemador de gas. The membrane 6, when open, that is to say when it does not obstruct the auxiliary channel 5 and the additional distribution channel 3.2, breaks the laminar flow of the oxidizing gas entering the auxiliary channel 5, causing a turbulent regime that improves the effectiveness of the combustion gas / fuel mixture, improving performance in terms of CO2 emissions . of the gas burner.
El cuerpo principal 1 a según la realización preferente de la invención comprende una ranura perimetral 11 dispuesta próxima a la apertura principal 10, tal y como se aprecia en las figuras 3 y 4, comprendiendo el canal de distribución adicional 3.2 dicha ranura perimetral 1 1. Tal y como se aprecia en dichas figuras 3 y 4, la ranura perimetral 11 rodea el canal auxiliar 5, estando dicha ranura perimetral 11 y dicho canal auxiliar 5 separados por una pared de separación 8, estando la apertura principal 10 contenida en el interior de dicha pared de separación 8. Tal y como se aprecia en la figura 2, en la realización preferente de la invención la ranura perimetral 11 , la apertura principal 10 y el tubo principal 9 son coaxiales. The main body 1 a according to the preferred embodiment of the invention comprises a perimeter groove 11 arranged close to the main opening 10, as seen in Figures 3 and 4, the additional distribution channel 3.2 comprising said perimeter groove 1 1. As can be seen in said figures 3 and 4, the perimeter groove 11 surrounds the auxiliary channel 5, said perimeter groove 11 and said auxiliary channel 5 being separated by a separation wall 8, the main opening 10 being contained within the interior of said separation wall 8. As can be seen in Figure 2, in the preferred embodiment of the invention the perimeter groove 11, the main opening 10 and the main tube 9 are coaxial.
El cuerpo principal 1 a, según la realización preferente de la invención, comprende al menos un brazo soporte 12.1 que une el tubo principal 9 con el contorno de la apertura principal 10, llegando el canal de distribución 3.1 de gas combustible al canal principal 4 del tubo principal 9 a través de uno de dichos brazos soporte 12.1 , tal y como se muestra en las figuras 3 y 4. The main body 1 a, according to the preferred embodiment of the invention, comprises at least one support arm 12.1 that joins the main tube 9 with the contour of the main opening 10, the fuel gas distribution channel 3.1 reaching the main channel 4 of the main tube 9 through one of said support arms 12.1, as shown in figures 3 and 4.
Tal y como se aprecia en la figura 4, el canal de distribución 3.1 es un canal lineal de sección preferentemente circular que se comunica con el canal principal 4 aproximadamente a media altura de dicho canal principal 4. As can be seen in Figure 4, the distribution channel 3.1 is a linear channel of preferably circular section that communicates with the main channel 4 approximately halfway up of said main channel 4.
Tal y como se aprecia en las figuras 2, 3 y 4, el cuerpo principal 1 a comprende un segundo brazo soporte 12.1 alineado con el primer brazo soporte 12.1 , estando el tubo principal 9 dispuesto entre ambos brazos soporte 12.1. As can be seen in Figures 2, 3 and 4, the main body 1 a comprises a second support arm 12.1 aligned with the first support arm 12.1, the main tube 9 being arranged between both support arms 12.1.
La membrana 6 según la realización preferente de la invención comprende una apertura central 6.4 para permitir el paso del tubo principal 9, tal y como se muestra en la figura 1 , estando la membrana 6 fijada a dicho tubo principal 9 en la realización preferente de la invención, tal y como se detallará más adelante. The membrane 6 according to the preferred embodiment of the invention comprises a central opening 6.4 to allow the passage of the main tube 9, as shown in Figure 1, the membrane 6 being fixed to said main tube 9 in the preferred embodiment of the invention, as will be detailed later.
En la realización preferente de la invención, la membrana 6 comprende dos alas 6.3, una a cada lado de los brazos soporte 12.1 , estando dichas alas 6.3 apoyadas sobre dichos brazos soporte 12.1 de manera que cada ala 6.3 puede moverse, pivotando respecto a las zonas fijadas al cuerpo principal 1a, empujada por el flujo del comburente cuando dicho flujo supera un determinado valor umbral, abriendo el paso del canal auxiliar 5 y el canal de distribución adicional 3.2. Cuando el flujo del gas comburente desciende por debajo de dicho valor umbral la membrana 6 vuelve a la posición de reposo, taponando de nuevo las alas 6.3 el canal auxiliar 5 y el canal de distribución adicional 3.2. Opcionalmente, las alas 6.3 también pueden estar fijadas a los brazos soporte 12.1. In the preferred embodiment of the invention, the membrane 6 comprises two wings 6.3, one on each side of the support arms 12.1, said wings 6.3 being supported on said support arms 12.1 so that each wing 6.3 can move, pivoting with respect to the zones fixed to the main body 1a, pushed by the flow of the oxidizer when said flow exceeds a certain threshold value, opening the passage of the auxiliary channel 5 and the additional distribution channel 3.2. When the flow of the oxidizing gas drops below said threshold value, the membrane 6 returns to the rest position, the wings 6.3 again blocking the auxiliary channel 5 and the additional distribution channel 3.2. Optionally, the wings 6.3 can also be fixed to the support arms 12.1.
El flujo del comburente es regulado por unos medios de ventilación del quemador de gas. The flow of the oxidizer is regulated by means of ventilation of the gas burner.
El quemador de gas por defecto está regulado para que trabaje a potencia baja, es decir, para que la membrana 6 esté en la posición de reposo, alimentando el cabezal del quemador únicamente con la mezcla de gas comburente/combustible proviniente del canal principal 4. Sin embargo, si se desea añadir más potencia al quemador de gas, basta con elevar la potencia de los medios de ventilación para que aumente el flujo del gas comburente. Cuando dicho flujo supere el valor umbral preestablecido las alas 6.3 se elevarán abriendo el canal auxiliar 5 y el canal de distribución adicional 3.2, aumentando así el flujo de la mezcla gas comburente/combustible. Las alas 6.3 se abrirán más o menos dependiendo del flujo del comburente, es decir, dependiendo de la potencia de los medios de ventilación. The default gas burner is regulated to work at low power, that is, so that the membrane 6 is in the rest position, feeding the burner head only with the combustion gas / fuel mixture from the main channel 4. However, if it is desired to add more power to the gas burner, it is sufficient to raise the power of the ventilation means so that the flow of the combustion gas increases. When said flow exceeds the predetermined threshold value, the wings 6.3 will be raised by opening the auxiliary channel 5 and the additional distribution channel 3.2, thus increasing the flow of the oxidizing gas / fuel mixture. The wings 6.3 will open more or less depending on the flow of the oxidizer, that is, depending on the power of the ventilation means.
Como la apertura de las alas 6.3 de la membrana 6 es gradual es posible regular también gradualmente la válvula que gestiona el paso del gas combustible, tal y como ya se ha explicado anteriormente. Por lo tanto, la regulación de la cantidad de gas combustible necesaria para asegurar una mezcla homogénea en base a la entrada de la cantidad de gas comburente se realiza de una manera exacta y precisa, con lo cual se consigue que la curva de emisiones de C02 se mantenga constante en todo el rango de modulación (regulación), evitándose los picos que se generarían en caso de una apertura brusca de unos medios de apertura y cierre rígidos. As the opening of the wings 6.3 of the membrane 6 is gradual, it is also possible to gradually regulate the valve that manages the passage of the combustible gas, as already explained above. Therefore, the regulation of the amount of combustible gas necessary to ensure a homogeneous mixture based on the input of the amount of oxidizing gas is carried out in an exact and precise manner, whereby the emission curve of C0 is achieved 2 remain constant throughout the modulation range (regulation), avoiding the peaks that would be generated in case of abrupt opening of rigid opening and closing means.
El gas comburente y el gas combustible una vez mezclados pasan a un conducto de salida 13 comprendido en el cuerpo principal 1 a y dispuesto a continuación del canal principal 4, del canal auxiliar 5 y del canal de distribución adicional 3.2. Dicho conducto de salida 13 está comunicado con un distribuidor, no mostrado en los dibujos, que ayuda a distribuir y dirigir dicha mezcla al cabezal del quemador para que se produzca la correspondiente llama ante la presencia de una chispa. The combustion gas and the combustible gas, once mixed, pass to an outlet duct 13 comprised in the main body 1 a and then disposed of the main channel 4, the auxiliary channel 5 and the additional distribution channel 3.2. Said outlet duct 13 is connected to a distributor, not shown in the drawings, which helps distribute and direct said mixture to the burner head so that the corresponding flame is produced in the presence of a spark.
La membrana 6, según la realización preferente de la invención, también comprende una cara de apoyo 6.1 , dispuesta en el reverso de la membrana 6, que comprende una superficie plana que en la posición de reposo descansa sobre el canal auxiliar 5 y el canal de distribución adicional 3.2 taponando ambos canales 5 y 3.2, y una cara exterior 6.2, dispuesta en el anverso de la membrana 6, que comprende al menos un nervio 7 de refuerzo que sobresale de dicha cara exterior 6.2, tal y como se muestra por ejemplo en la figura 1. The membrane 6, according to the preferred embodiment of the invention, also comprises a support face 6.1, arranged on the back of the membrane 6, which comprises a flat surface that in the rest position rests on the auxiliary channel 5 and the additional distribution 3.2 plugging both channels 5 and 3.2, and an outer face 6.2, disposed on the obverse of the membrane 6, comprising at least one reinforcing rib 7 protruding from said outer face 6.2, as shown for example in Figure 1
En la realización preferente de la invención, la cara de apoyo 6.1 de la membrana 6 en la posición de reposo descansa sobre la superficie exterior de los brazos soporte 12.1 , la superficie exterior de la pared de separación 8, y una tercera superficie de apoyo 12.3 que se extiende radialmente a partir del canal de distribución adicional 3.2, estando preferentemente la membrana 6 fijada al cuerpo principal 1 a alrededor del tubo principal 9 y de los brazos soporte 12.1. Las superficies exteriores de los brazos soporte 12.1 y la pared de separación 8 y dicha tercera superficie de apoyo 12.3 están al mismo nivel. In the preferred embodiment of the invention, the support face 6.1 of the membrane 6 in the rest position rests on the outer surface of the support arms 12.1, the outer surface of the separation wall 8, and a third support surface 12.3 extending radially from the additional distribution channel 3.2, preferably being the membrane 6 fixed to the main body 1 around the main tube 9 and the support arms 12.1. The outer surfaces of the support arms 12.1 and the separation wall 8 and said third support surface 12.3 are at the same level.
Opcionalmente, la cara de apoyo 6.1 de la membrana 6 puede comprender un labio perimetral, dispuesto preferentemente a continuación de la cara plana para favorecer el sellado del canal auxiliar 5 y el canal de distribución adicional 3.2. Dicho labio perimetral puede estar apoyado por ejemplo sobre la tercera superficie de apoyo 12.3 cuando la membrana 6 está en la posición de reposo. Optionally, the support face 6.1 of the membrane 6 can comprise a perimeter lip, preferably arranged next to the flat face to favor the sealing of the auxiliary channel 5 and the additional distribution channel 3.2. Said perimeter lip may be supported, for example, on the third bearing surface 12.3 when the membrane 6 is in the rest position.
La membrana 6 según la realización preferente de la invención comprende una pluralidad de nervios 7 de refuerzo radiales, tal y como se aprecia en la figura 1. Opcionalmente, la membrana 6 también puede comprender al menos un nervio 7’ de refuerzo diametral, pudiendo estar dicho nervio 7’ de refuerzo dividido en varias porciones. The membrane 6 according to the preferred embodiment of the invention comprises a plurality of radial reinforcement ribs 7, as can be seen in Figure 1. Optionally, the membrane 6 can also comprise at least one diametral reinforcement rib 7 ', which may be said reinforcement rib 7 'divided into several portions.
Los nervios de refuerzo 7 y 7’ evitan que las alas 6.3 oscilen, es decir que tengan un movimiento de vaivén, cuando dichas alas 6.3 son alejadas de la posición de reposo empujadas por el flujo del gas comburente. Las alas 6.3 son simétricas, de esta manera se equilibran las fuerzas necesarias para alejar dichas alas 6.3 de la posición de reposo, por lo que las alas 6.3 se moverán simultáneamente. The reinforcing ribs 7 and 7 'prevent the wings 6.3 from oscillating, that is to say that they have a reciprocating movement, when said wings 6.3 are moved away from the resting position pushed by the flow of the oxidizing gas. The wings 6.3 are symmetrical, in this way the forces necessary to move said wings 6.3 from the resting position are balanced, whereby the wings 6.3 will move simultaneously.
En la figura 7 se muestra una segunda realización de la membrana 6. Esta membrana 6 también comprende dos alas 6.3 y todas las características descritas anteriormente, pero a diferencia de la membrana 6 de la primera realización, dichas alas 6.3 están contenidas en un reborde 6.5 perimetral, estando dicho reborde 6.5 apoyado y fijado adicionalmente sobre la tercera superficie de apoyo 12.3 del cuerpo principal 1 a. Esta configuración permite una mayor fijación de la membrana 6 al cuerpo principal 1 a. A second embodiment of the membrane 6 is shown in Fig. 7. This membrane 6 also comprises two wings 6.3 and all the features described above, but unlike the membrane 6 of the first embodiment, said wings 6.3 are contained in a flange 6.5 perimeter, said flange 6.5 supported and additionally fixed on the third support surface 12.3 of the main body 1 a. This configuration allows a greater fixation of the membrane 6 to the main body 1 a.
En una tercera realización de la invención, la membrana 6 tiene forma de cazoleta, tal y como se muestra en las figuras 8A y 8B. La pared circunferencial exterior 6.6 de dicha cazoleta y/o el reborde superior 6.7 se fija al cuerpo principal 1 a, preferentemente a la pared interior del conducto de salida 13. La membrana 6 de esta realización comprende preferentemente cuatro alas 6.3 dispuestas en la base de la cazoleta que se abren y se cierran desde el tubo principal 9, dependiendo del flujo de gas comburente que llega a través del conducto de entrada 2, tal y como ya se ha explicado anteriormente. En un ejemplo no limitativo, la partición de estas cuatro alas 6.3 forman una cruz, disponiéndose preferentemente dicha cruz de forma que no coincida con los brazos soporte 12.1 del cuerpo principal 1a, es decir de forma que ninguno de los lados de la cruz coincida o este alineado con los brazos soporte 12.1. In a third embodiment of the invention, the membrane 6 is cup-shaped, as shown in Figures 8A and 8B. The outer circumferential wall 6.6 of said bowl and / or the upper flange 6.7 is fixed to the main body 1 a, preferably to the inner wall of the outlet duct 13. The membrane 6 of this embodiment preferably comprises four wings 6.3 arranged in the base of the bowl that opens and closes from the main tube 9, depending on the flow of oxidizing gas that arrives through the inlet duct 2, as already explained above. In a non-limiting example, the partition of these four wings 6.3 forms a cross, said cross being preferably arranged so that it does not coincide with the support arms 12.1 of the main body 1a, that is to say so that neither side of the cross coincides or is aligned with the support arms 12.1.
Opcionalmente, la membrana 6 en forma de cazoleta puede comprender un nervio 7’ de refuerzo diametral dispuesto cerca del tubo principal 9, es decir próximo al borde de la apertura central 6.4 de la propia membrana 6, que se divide en varias porciones, preferentemente una por cada ala 6.3, tal y como se aprecia en la figura 9, que muestra una cuarta realización de la membrana 6. Este nervio 7’, al igual que los nervios radiales 7 y/o diametrales 7’ de la primera realización, evita que las alas 6.3 oscilen cuando dichas alas 6.3 son alejadas de la posición de reposo empujadas por el flujo del gas comburente. Adicionalmente, esta membrana 6 también puede comprender más nervios 7’ de refuerzo diametrales y/o radiales 7. Optionally, the bowl-shaped membrane 6 may comprise a diametral reinforcing rib 7 'arranged near the main tube 9, that is to say near the edge of the central opening 6.4 of the membrane 6 itself, which is divided into several portions, preferably a for each wing 6.3, as shown in Figure 9, which shows a fourth embodiment of the membrane 6. This nerve 7 ', as well as the radial and diametral ribs 7' of the first embodiment, prevents wings 6.3 oscillate when said wings 6.3 are moved away from the resting position pushed by the flow of the oxidizing gas. Additionally, this membrane 6 can also comprise more diametric and / or radial reinforcement ribs 7 ’.
Al igual que en las membranas 6 descritas anteriormente, en este caso las alas 6.3 también son simétricas de modo que también se equilibran las fuerzas necesarias para alejar dichas alas 6.3 de la posición de reposo para que éstas se muevan simultáneamente. As in the membranes 6 described above, in this case the wings 6.3 are also symmetrical so that the forces necessary to move said wings 6.3 away from the resting position are also balanced so that they move simultaneously.
En la realización preferente de la invención, la membrana 6 (según cualquiera de las realizaciones descritas) está fijado al cuerpo principal 1a por sobremoldeo, obteniéndose de esta manera un dispositivo mezclador 1 compacto y robusto con un diseño simple y económico. Las zonas de unión entre la membrana 6 y el cuerpo principal 1 a se corresponden con las zonas de fijación descritas para cada realización. In the preferred embodiment of the invention, the membrane 6 (according to any of the described embodiments) is fixed to the main body 1a by overmolding, thus obtaining a compact and robust mixing device 1 with a simple and economical design. The junction zones between the membrane 6 and the main body 1 a correspond to the fixing zones described for each embodiment.
Opcionalmente, la membrana 6 de la invención también puede ser fijada al cuerpo principal 1a, en las zonas de fijación descritas para cada realización, por ultrasonidos, por soldadura o mediante la aplicación de un adhesivo. Optionally, the membrane 6 of the invention can also be fixed to the main body 1a, in the fixing areas described for each embodiment, by ultrasound, by welding or by the application of an adhesive.
También sería posible unir la membrana 6 y el cuerpo principal 1 a por deformación en frío o en caliente. En este sentido, parte del cuerpo principal 1a podría ser deformado para atrapar al menos una porción de la membrana 6, una vez de que la membrana 6 haya sido dispuesta en la posición final, atrapando al menos una porción de la membrana 6. En un ejemplo no limitativo, una vez que la membrana 6 haya sido dispuesta sobre el cuerpo principal 1 a en la posición final, el tubo principal del cuerpo principal 1a es deformado atrapando el borde de la apertura central 6.4 de la membrana 6. It would also be possible to join the membrane 6 and the main body 1 a by cold or hot deformation. In this sense, part of the main body 1a could be deformed to trap at least a portion of the membrane 6, once the membrane 6 has been arranged in the final position, trapping at least a portion of the membrane 6. In a non-limiting example, once the membrane 6 has been arranged on the main body 1 a in the In the final position, the main tube of the main body 1a is deformed by trapping the edge of the central opening 6.4 of the membrane 6.
El tubo principal 9, según la realización preferente de la invención, comprende una cara plana 15 dispuesta al menos en un lateral que coopera con una cara plana correspondiente de la membrana 6 dispuesta en la apertura central 6.4, tal y como se aprecia en la figura 7, para asegurar la correcta colocación de la membrana 6 de la invención sobre el cuerpo principal 1 a del dispositivo mezclador 1. The main tube 9, according to the preferred embodiment of the invention, comprises a flat face 15 arranged at least on one side cooperating with a corresponding flat face of the membrane 6 arranged in the central opening 6.4, as shown in the figure 7, to ensure the correct placement of the membrane 6 of the invention on the main body 1 a of the mixing device 1.
Opcionalmente, el tubo principal 9 puede comprender dos caras planas 15 dispuestas en dos laterales opuestos, cada una cooperando con una correspondiente cara plana 15’ de la membrana 6, dispuestas enfrentadas en la apertura central 6.4, para facilitar su montaje. Optionally, the main tube 9 can comprise two flat faces 15 arranged on two opposite sides, each cooperating with a corresponding flat face 15 ’of the membrane 6, arranged facing each other in the central opening 6.4, to facilitate its assembly.
En una realización preferente, la membrana 6 de la invención es de silicona, EPDM o NBR (nitrilo butadieno) y el cuerpo principal 1a del dispositivo mezclador 1 es de plástico rígido, preferentemente poliamida, o metálico. In a preferred embodiment, the membrane 6 of the invention is made of silicone, EPDM or NBR (nitrile butadiene) and the main body 1a of the mixing device 1 is made of rigid plastic, preferably polyamide, or metal.
Gracias al dispositivo mezclador 1 de la invención, la curva de emisiones de C02 del quemador de gas se mantiene constante en todo el rango de modulación, es decir de regulación, evitándose los picos que se generarían en caso de una apertura y cierre brusca del canal auxiliar 5 y del canal de distribución adicional 3.2. Si se utilizaran unos medios de apertura y cierre rígidos en vez de la membrana 6 flexible, como en el caso de US20110139045A1 , dicha apertura, y también el cierre, sería inmediata, con lo cual en un espacio de tiempo relativamente corto la variación del gas combustible y del gas comburente antes de la apertura del canal de distribución adicional 3.2 y del canal auxiliar 5, y justo después de la apertura sería elevada dando lugar a dichos picos no deseados. Thanks to the mixing device 1 of the invention, the C02 emission curve of the gas burner is kept constant throughout the entire modulation range, that is to say of regulation, avoiding the peaks that would be generated in case of an abrupt opening and closing of the channel auxiliary 5 and additional distribution channel 3.2. If rigid opening and closing means were used instead of the flexible membrane 6, as in the case of US20110139045A1, said opening, and also the closing, would be immediate, whereby in a relatively short time the variation of the gas fuel and combustion gas before the opening of the additional distribution channel 3.2 and the auxiliary channel 5, and just after the opening would be elevated giving rise to said unwanted peaks.
El cuerpo principal 1a del dispositivo mezclador 1 comprende medios de fijación, preferentemente una pluralidad de orificios 14 dispuestos diametralmente tal y como se aprecia por ejemplo en la figura 1 , para permitir la unión del dispositivo mezclador 1 al quemador de gas. The main body 1a of the mixing device 1 comprises fixing means, preferably a plurality of holes 14 arranged diametrically as can be seen, for example, in Figure 1, to allow the mixing device 1 to be attached to the gas burner.
El gas comburente utilizado en el quemador y el dispositivo mezclador 1 de la invención es aire y el gas comburente puede ser gas natural, butano o propano. La invención se refiere también a un quemador de gas que comprende el dispositivo mezclador de la invención. The combustion gas used in the burner and the mixing device 1 of the invention is air and the combustion gas can be natural gas, butane or propane. The invention also relates to a gas burner comprising the mixing device of the invention.

Claims

REIVINDICACIONES
1. Dispositivo mezclador para un quemador de gas, que comprende un cuerpo principal (1a) que comprende un conducto de entrada (2) de gas comburente, preferentemente aire, un conducto de entrada (3) de gas combustible, un canal principal (4) comunicado con el conducto de entrada (2) de gas comburente de forma que se produce un estrechamiento del flujo del gas comburente al ser obligado a circular por dicho canal principal (4), estando dicho canal principal (4) comunicado con el conducto de entrada (3) de gas combustible a través de un canal de distribución (2.1) de gas combustible, propiciándose la mezcla del gas combustible y el gas comburente en dicho canal principal (4), y un canal auxiliar (5) comunicado con el conducto de entrada (2) de gas comburente, estando dispuesto dicho canal auxiliar (5) próximo al canal principal (4), caracterizado porque el cuerpo principal (1a) comprende también un canal de distribución adicional (2.2) comunicado con el conducto de entrada (3) de gas combustible, estando dispuesto dicho canal de distribución adicional (2.2) próximo al canal auxiliar (5), comprendiendo también el dispositivo mezclador (1) una membrana (6) flexible que está fijada al cuerpo principal (1a) y que en una posición de reposo se apoya sobre el canal auxiliar (5) y el canal de distribución adicional (2.2) obturando ambos canales (5, 2.2), estando configurada la membrana (6) para moverse por la acción del flujo de gas comburente que llega a través del conducto de entrada (2) del comburente cuando dicho flujo supera un determinado umbral, permitiendo el paso de gas comburente a través del canal auxiliar (5) y el paso de gas combustible a través del canal de distribución adicional (2.2). 1. Mixing device for a gas burner, comprising a main body (1a) comprising a combustion gas inlet conduit (2), preferably air, a fuel gas inlet conduit (3), a main channel (4 ) communicated with the combustion gas inlet conduit (2) so that the flow of the combustion gas is narrowed by being forced to circulate through said main channel (4), said main channel (4) being communicated with the conduit of fuel gas inlet (3) through a fuel gas distribution channel (2.1), the mixture of the fuel gas and the oxidizing gas being caused in said main channel (4), and an auxiliary channel (5) communicated with the conduit of inlet (2) of oxidizing gas, said auxiliary channel (5) being arranged close to the main channel (4), characterized in that the main body (1a) also comprises an additional distribution channel (2.2) communicated with the inlet conduit ( 3) of ga s fuel, said additional distribution channel (2.2) being arranged close to the auxiliary channel (5), the mixing device (1) also comprising a flexible membrane (6) which is fixed to the main body (1a) and which in a position of resting rests on the auxiliary channel (5) and the additional distribution channel (2.2) by sealing both channels (5, 2.2), the membrane (6) being configured to move by the action of the flow of oxidizing gas that arrives through the inlet duct (2) of the oxidizer when said flow exceeds a certain threshold, allowing the passage of combustion gas through the auxiliary channel (5) and the passage of combustible gas through the additional distribution channel (2.2).
2. Dispositivo mezclador según la reivindicación 1 , en donde el cuerpo principal (1a) comprende una apertura principal (10), preferentemente central, y un tubo principal (9) dispuesto en dicha apertura principal (10), comprendiendo el tubo principal (9) el canal principal (4) y comprendiendo la apertura principal (10) el canal auxiliar (5). 2. Mixing device according to claim 1, wherein the main body (1a) comprises a main opening (10), preferably central, and a main tube (9) disposed in said main opening (10), the main tube (9) comprising ) the main channel (4) and the main opening (10) comprising the auxiliary channel (5).
3. Dispositivo mezclador según la reivindicación 2, en donde el cuerpo principal (1a) comprende una ranura perimetral (11) próxima a la apertura principal (10), comprendiendo el canal de distribución adicional (2.2) dicha ranura perimetral (11). 3. Mixing device according to claim 2, wherein the main body (1a) comprises a perimeter groove (11) close to the main opening (10), the additional distribution channel (2.2) comprising said perimeter groove (11).
4. Dispositivo mezclador según la reivindicación 3, en donde la ranura perimetral (11), la apertura principal (10) y el tubo principal (9) son coaxiales. 4. Mixing device according to claim 3, wherein the perimeter groove (11), the main opening (10) and the main tube (9) are coaxial.
5. Dispositivo mezclador según cualquiera de las reivindicaciones 2 a 4, en donde el cuerpo principal (1a) comprende al menos un brazo soporte (1 1.3) que une el tubo principal (9) con el contorno de la apertura principal (10), llegando el canal de distribución (2.1) de gas combustible al canal de distribución (4) del tubo principal (9) a través de uno de dichos brazos soporte (11.3). 5. Mixing device according to any of claims 2 to 4, wherein the body main (1a) comprises at least one support arm (1 1.3) that joins the main tube (9) with the contour of the main opening (10), the distribution channel (2.1) of combustible gas reaching the distribution channel (4) ) of the main tube (9) through one of said support arms (11.3).
6. Dispositivo mezclador según cualquiera de las reivindicaciones 2 a 5, en donde la membrana (6) comprende una abertura central (6.4) para permitir el paso del tubo principal (9). 6. Mixing device according to any of claims 2 to 5, wherein the membrane (6) comprises a central opening (6.4) to allow passage of the main tube (9).
7. Dispositivo mezclador según cualquiera de las reivindicaciones 2 a 6, en donde la membrana (6) comprende una cara de apoyo (6.1) que comprende una superficie plana que en la posición de reposo descansa sobre el canal auxiliar (5) y el canal de distribución adicional (2.2), y una cara exterior (6.2) que comprende al menos un nervio (7) de refuerzo que sobresale hacia el exterior. 7. Mixing device according to any of claims 2 to 6, wherein the membrane (6) comprises a support face (6.1) comprising a flat surface that in the rest position rests on the auxiliary channel (5) and the channel of additional distribution (2.2), and an outer face (6.2) comprising at least one reinforcing rib (7) projecting outwards.
8. Dispositivo mezclador según la reivindicación 7, en donde la membrana (6) comprende una pluralidad de nervios (7) de refuerzo radiales y/o al menos un nervio (7’) de refuerzo diametral. 8. Mixing device according to claim 7, wherein the membrane (6) comprises a plurality of radial reinforcement ribs (7) and / or at least one diametral reinforcement rib (7 ’).
9. Dispositivo mezclador según cualquiera de las reivindicaciones 2 a 8, en donde la membrana (6) está fijada al menos al tubo principal (9). 9. Mixing device according to any of claims 2 to 8, wherein the membrane (6) is fixed at least to the main tube (9).
10. Dispositivo mezclador según cualquiera de las reivindicaciones 5 a 9, que comprende dos brazos soporte (1 1.3) alineados, comprendiendo la membrana (6) dos alas (6.3), una a cada lado de los brazos soporte (1 1.3), estando dichas alas (6.3) apoyadas y preferentemente fijadas sobre dichos brazos soporte (11.3). 10. Mixing device according to any of claims 5 to 9, comprising two support arms (1 1.3) aligned, the membrane (6) comprising two wings (6.3), one on each side of the support arms (1 1.3), being said wings (6.3) supported and preferably fixed on said support arms (11.3).
1 1. Dispositivo mezclador según cualquiera de las reivindicaciones 1 a 8, en donde la membrana (6) tiene forma de cazoleta, fijándose la pared exterior de dicha cazoleta al cuerpo principal (1 a), y comprendiendo la membrana (6) al menos dos alas (6.3), preferentemente cuatro alas (6.3), que se abren y se cierran desde la parte central de la membrana (6) dependiendo del flujo de gas comburente que llega a través del conducto de entrada (2). 1 1. Mixing device according to any one of claims 1 to 8, wherein the membrane (6) is shaped like a bowl, the outer wall of said bowl being fixed to the main body (1 a), and the membrane (6) comprising at least two wings (6.3), preferably four wings (6.3), which open and close from the central part of the membrane (6) depending on the flow of oxidizing gas that arrives through the inlet conduit (2).
12. Dispositivo mezclador según cualquiera de las reivindicaciones anteriores, en donde la membrana (6) se fija al cuerpo principal (1a) por sobremoldeo. 12. Mixing device according to any of the preceding claims, wherein the membrane (6) is fixed to the main body (1a) by overmolding.
13. Dispositivo mezclador según cualquiera de las reivindicaciones 2 a 11 , en donde la membrana (6) está fijada al cuerpo principal (1a) por deformación en frío o en caliente de al menos parte del tubo principal (9) que atrapa una porción de la membrana (6), por ultrasonidos, por soldadura o mediante la aplicación de un adhesivo. 13. Mixing device according to any of claims 2 to 11, wherein the membrane (6) is fixed to the main body (1a) by cold or hot deformation of at least part of the main tube (9) that traps a portion of the membrane (6), by ultrasound, by welding or by applying an adhesive
14. Dispositivo mezclador según cualquiera de las reivindicaciones anteriores, en donde la membrana (6) es de silicona, EPDM o NBR y el cuerpo principal (1a) del dispositivo mezclador (1) es de plástico rígido, preferentemente poliamida. 14. Mixing device according to any of the preceding claims, wherein the membrane (6) is made of silicone, EPDM or NBR and the main body (1a) of the mixing device (1) is made of rigid plastic, preferably polyamide.
15. Quemador de gas de premezcla caracterizado porque comprende un dispositivo mezclador (1) según cualquiera de las reivindicaciones anteriores. 15. Premix gas burner characterized in that it comprises a mixing device (1) according to any of the preceding claims.
PCT/ES2018/070838 2018-01-09 2018-12-28 Mixer device for a gas burner WO2019138146A1 (en)

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KR2020207000040U KR200497783Y1 (en) 2018-01-09 2018-12-28 Mixing device for gas burners
CN201890001457.6U CN212930063U (en) 2018-01-09 2018-12-28 Mixer device for a gas burner and premix gas burner

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EP18382003.4 2018-01-09
EP18382003.4A EP3508788B1 (en) 2018-01-09 2018-01-09 Mixer device for a gas burner

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CN212930063U (en) 2021-04-09
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EP3508788B1 (en) 2020-10-21
KR200497783Y1 (en) 2024-03-04

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