EP3728948B1 - Dispositif d'injection pour un brûleur à gaz d'un appareil ménager, brûleur à gaz et appareil ménager - Google Patents

Dispositif d'injection pour un brûleur à gaz d'un appareil ménager, brûleur à gaz et appareil ménager Download PDF

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Publication number
EP3728948B1
EP3728948B1 EP18816247.3A EP18816247A EP3728948B1 EP 3728948 B1 EP3728948 B1 EP 3728948B1 EP 18816247 A EP18816247 A EP 18816247A EP 3728948 B1 EP3728948 B1 EP 3728948B1
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EP
European Patent Office
Prior art keywords
gas
gas burner
injector device
pipe member
openings
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP18816247.3A
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German (de)
English (en)
Other versions
EP3728948A1 (fr
Inventor
Cesar Aguado Vela
Javier Corral Ricalde
Jose Salvador Ochoa Torres
Cristina RUEDA SANUDO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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Publication date
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Publication of EP3728948A1 publication Critical patent/EP3728948A1/fr
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Publication of EP3728948B1 publication Critical patent/EP3728948B1/fr
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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
    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • 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
    • F23D14/48—Nozzles
    • 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
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/08—Arrangement or mounting of burners

Definitions

  • the invention relates to an injector device for a gas burner of a household appliance.
  • the injector device has a tube portion through which gas flows during operation of the gas burner.
  • a wall portion delimits the tube portion.
  • the wall portion has an opening through which gas exits the injector device during operation of the gas burner.
  • the invention further relates to a gas burner with such an injector device and to a household appliance with at least one gas burner.
  • WO 2005/073630 A1 describes a gas burner suitable for use with a wok.
  • a manifold of the gas burner has a plurality of injector nozzles which are arranged at equal distances from each other on an inner periphery of a cup member of the manifold.
  • JP 2001 050511 A describes a gas burner including a burner body composed of a bent tube.
  • the burner body includes circular arc shaped sections enlarged with predetermined radii of curvatures from a one end side to the other side in an axial direction. There is provided an interval between a final point of the circular arc shaped section and a final point of the circular arc shaped section.
  • There are formed on the other end side located axially of the burner body slope sections inclining from the final point of the circular arc shaped section toward the inside and an annular surface extending upwardly vertically from the final point of the circular arc shaped section.
  • GB 819 723 A describes a gas injector especially for use with hydrocarbon gases of high calorific value, e.g. propane or butane comprising a body member having a gas inlet, a plurality of jets supported by the body member, each jet having a single orifice, wherein the streams of gas impinge on a choke member, to the opposite end of which is connected a venturi tube, the body member having air inlet apertures communicating with the space between the jet and the choke.
  • hydrocarbon gases of high calorific value e.g. propane or butane
  • a gas injector especially for use with hydrocarbon gases of high calorific value, e.g. propane or butane comprising a body member having a gas inlet, a plurality of jets supported by the body member, each jet having a single orifice, wherein the streams of gas impinge on a choke member, to the opposite end of which is connected a venturi tube, the body member having air inlet apertures communicating with the space between the
  • EP 2 572 141 A2 describes a gas burner with multiple flame rings, comprising an injector holder piece, a flame divider having an outer portion of overall annular shape and an inner portion of overall circular shape, and means for upperly closing said outer and inner portions.
  • US 2015/233883 A1 describes a heating system including certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel flowing into the feature.
  • the injector device according to the invention for a gas burner of a household appliance has a tube portion through which gas flows during operation of the gas burner.
  • the injector device further has a wall portion delimiting the tube portion.
  • the wall portion has at least two openings through which gas exits the injector device during operation of the gas burner.
  • the at least two openings are configured to divide a single gas stream flowing through the tube portion during operation of the gas burner into separated gas streams.
  • the tube portion comprises an inlet section provided by a pipe member of the injector device and an end section provided by a hat-shaped member, connected to the pipe member in a detachable manner, wherein the hat-shaped member, is detachably fixed to the pipe member by means of a holding element.
  • the hat-shaped member comprises a flange portion, wherein the flange portion is pressed against an end face of the pipe member by means of the holding element, wherein the holding element comprises an internal thread that is screwed onto the pipe member, and wherein the pipe member has an external thread provided on an outer surface of the pipe member.
  • an increased inlet of primary air is achieved, as a particularly large quantity of air is entrained by the separated gas streams.
  • the mixture containing the gas and the primary air is very homogenous. Since the mixture is more homogenous the combustion is improved. In particular, the homogeneity of the mixture prior to leaving a burner body or mixture spreader of the gas burner is improved. This also leads to reduced emissions of pollutant greenhouse gases.
  • a particularly large diversity of gas burner designs can be realized as the burner design is less constrained by space requirements.
  • the at least two openings are configured such that the separated gas streams entrain a larger quantity of air surrounding the gas streams than a single gas stream having the same flow rate as the at least two gas streams together.
  • dividing the single gas stream flowing through the tube portion into the plurality of gas streams or gas jets having the same fluid properties and velocity magnitudes will lead to gas streams with a reduced gas flow rate of each one of the separated gas streams.
  • the gas streams will be thinner, and their speeds will be reduced as the gas is mixed with the air surrounding the individual gas stream. Every gas stream or gas jet entrains the surrounding, stagnant fluid in the form of the (primary) air surrounding the gas streams. This increases the global or total air-entrainment capacity of the injector device during the operation of the gas burner.
  • the above-mentioned advantages are further enhanced.
  • the wall portion is configured as a top plate of the injector device. Consequently, the single gas stream flowing through the tube portion can be particularly well divided into the separated gas streams.
  • the tube portion comprises an inlet section provided by a pipe member of the injector device and an end section provided by a second, hat shaped, member, connected to the pipe member in a detachable manner.
  • This allows to configure or equip the injector device with a specific second member having a desired number, shape and distribution of openings or perforations in the wall portion.
  • the number, shape and distribution of the openings leading to the formation of the separated gas streams can be readily adapted to the specific boundary conditions of the gas burner.
  • the cross-sectional area of the at least two openings and/or the number of the openings and/or the shape of the openings and/or the distribution of the openings in the wall portion can be adapted to the specific conditions of the gas burner to achieve optimum results with respect to the entrainment of air and to the mixing of gas with the air or primary air.
  • the hat-shaped member has a flange portion which abuts on an end face of the pipe member.
  • a very smooth transition between the inlet section and the end section is provided, which facilitates the flow of the single gas stream through the tube portion. Further, this facilitates mounting the hat-shaped member onto the pipe member.
  • the hat-shaped member is detachably fixed to the pipe member by means of a holding element.
  • a very tight connection between the hat-shaped member and the pipe member is achieved.
  • the holding element has an internal thread which is in engagement with an external thread provided on an outer surface of the pipe member.
  • the at least two openings can have the same shapes or different shapes. In a very simple configuration the at least two openings can have a round shape. Alternatively or additionally, the shape of the at least two openings can be rectangular and/or square and/or triangular. Further, the at least two openings can have a star-like shape. Such a shape leads to a rather large contact zone between the gas stream or fuel jet and the surrounding air. This is also valid for other polygonal shapes of the openings.
  • a double coned shape of the at least two openings produces a particularly high entrainment of the surrounding air and therefore enhances the mixing of the gas with the air.
  • the openings or perforations can have an arched shape. The dimensions and/or the shape and/or the number of the holes or openings in the wall portion can be readily adapted to the requirements, in particular space requirements, of the gas burner to be equipped with the injector device.
  • the gas burner according to the invention has at least one injector device according to the invention.
  • the at least one injector device is preferably arranged upstream of a venturi device of the gas burner.
  • the venturi device is configured to entrain primary air from the surroundings of the injector device into a mixing zone of the gas burner. From this mixing zone a mixture of gas with the air can exit a mixture spreader of the gas burner towards the surroundings of the mixture spreader. Here the mixture is mixed with further, secondary air, and the mixture is ignited.
  • the mixing of gas exiting the at least one injector device with primary air is improved.
  • the household appliance according to the invention has at least one gas burner according to the invention.
  • the at least one injector device is arranged below a top sheet of the household appliance.
  • the household appliance can in particular be a gas stove or gas cooker or a gas oven.
  • the gas burner can in particular be configured as a wok burner.
  • Fig. 1 schematically shows a section view of an upper part of a household appliance configured as a gas stove 1 which is further shown in Fig. 10 .
  • the gas stove 1 has a plurality of gas burners 2 which are also schematically indicated in Fig. 10 .
  • the gas burner 2 which is partially shown in the section view in Fig. 1 , comprises an injector device or injector nozzle 3 which is arranged below a top plate or top sheet 4 of the gas stove 1.
  • the top sheet 4 can be a metal sheet.
  • the top sheet 4 can be made from glass.
  • Supports 5 (see Fig. 10 ) for supporting a frying pan or a saucepan 6 are arranged on top of the top sheet 4, such that a bottom 7 of the saucepan 6 is arranged at a certain height 8 above the top sheet 4 and above the gas burner 2.
  • An injector holder 9 holds the injector nozzle 3 and has air inlets 10 which allow primary air 11 to be mixed with gas 12 exiting the injector nozzle 3 during operation of the gas burner 2.
  • the primary air 11 is illustrated by curved arrows in Fig. 1
  • the gas 12 flowing through the injector nozzle 3 is illustrated by straight arrows in Fig. 1 .
  • the gas 12 entrains primary air 11 into a venturi tube 13 of the gas burner 2.
  • the primary air 11 enters the venturi tube 13 through the air inlets 10.
  • the venturi tube 13 is provided by a base part 14 of a mixture spreader 15 of the gas burner 2.
  • the mixture spreader 15 further comprises a cap 16 located on top of the base part 14.
  • the cap 16 has a plurality of outlets along its periphery, such that the mixture of the primary air 11 and the gas 12 leaves the mixture spreader 15 in radial direction during operation of the gas burner 2.
  • a flow of the mixture towards these outlets is indicated by further arrows 17 in Fig. 1 .
  • the fuel or gas 12 needs an exact (stoichiometric) quantity of air to be fully burned. To achieve this, the gas 12 is in in the first instance premixed with the primary air 11.
  • the primary air entrainment is caused by fuel jets or gas streams 23 (see Fig. 2 ) in the area surrounding the injector nozzle 3 and the venturi tube 13.
  • the injector nozzle 3 has a tube portion 20 through which the gas 12 flows during operation of the gas burner 2.
  • a wall portion which is configured as a top plate 21 of the injector nozzle 3 has at least two openings 22, as can also be well seen from Fig. 3 .
  • the gas 12 flowing through the tube portion 20 during operation of the gas burner 2 is indicated by straight arrows in Fig. 2 and Fig. 3 .
  • the openings 22 or holes are configured to divide a single gas stream flowing through the tube portion 20 into separated gas streams 23 leaving the injector nozzle 3 through the openings 22.
  • the injector nozzle 3 is shown to have two openings 22 or holes. However, the injector nozzle 3 may have as many holes or openings 22 as is considered necessary for a specific gas burner 2 or for the specific power rate or flow rate of the gas 12 being fed into the injector nozzle 3 of the gas burner 2. For example, depending on the type of gas 12 fed into the injector nozzle 3, i.e. depending on the type of gas 12 utilized, different flow rates and/or different pressures may exist. For example, methane is provided in Europe at a pressure of 20 mbar, and butane can be provided at 29 mbar or 50 mbar depending on the country. The injector nozzle 3 is configured to work with these types of pressures and these types of fuels or gases 12.
  • the arrangement and/or number and/or shape of the openings 22 provided in the top plate 21 is preferably adapted in order to divide the gas 12 flowing through the tube portion 20 into several gas streams 23 or gas jets, in particular dependent on the type of gas 12 utilized and/or the pressure of the gas 12 fed into the injector nozzle 3.
  • the single stream of gas 12 flowing through the tube portion 20 is divided into, for example, the two gas streams 23 shown in Fig. 2 , these gas streams 23 can have the same fluid properties and velocity magnitudes but a lower flow rate than the single gas stream. Thus, every gas stream 23 will entrain the stagnant primary air 11 surrounding each one of the gas streams 23. Dividing the single gas stream flowing through the tube portion 20 into the separated gas streams 23 therefore leads to an increase of the overall air entrainment capacity of the injector nozzle 3.
  • the gas streams 23 are thinner than a single gas stream which would leave the injector nozzle 3 through a central, single hole of the same cross-sectional area as the sum of the cross-sectional areas of the openings 22. Therefore, the thinner gas streams 23 reduce their speed as the gas and the primary air 11 is mixed in the area below the venturi tube 13 and within the venturi tube 13. Consequently, even in a particularly reduced space for the venturi tube 13 a larger quantity of primary air 11 can be introduced into the mixture containing the gas 12 and the primary air 11. Further, the homogeneity of the mixture is improved prior to leaving the burner body or mixture spreader 15.
  • the shape and/or number and/or arrangement of the openings 22 provided in the injector nozzle 3 is preferably adapted to the type of gas 12 utilized and to the power rate or pressure with which the gas 12 is provided to the injector nozzle 3.
  • the heat value of the gas 12 i.e. the energy per mass unit or volume unit
  • the gas 12 which is fed into the tube portion 20 with overpressure first flows through an inlet section of the tube portion 20, which is provided by a pipe member 24.
  • An end section of the tube portion 20 is provided by a hat-shaped member 25 which is connected to the pipe member 24 in a detachable manner.
  • the hat-shaped member 25 has a flange portion 26 which is pressed against an end face 27 of the pipe member 24.
  • a holding element 28 which has an internal thread is screwed onto the pipe member 24 which has an external thread provided on an outer surface 29 of the pipe member 24.
  • the holding element 28 can have a hexagon shape to facilitate screwing the holding member 28 onto the pipe member 24.
  • this part of the injector nozzle 3 can be easily changed, for example, depending on the type and/or pressure of gas 12 utilized in the gas burner 2 and/or depending on the desired air entrainment capacity of the injector nozzle 3. Openings 22 or holes of variable diameters, variable number, variable arrangements and variable shapes can therefore be provided by fixing the appropriate hat-shaped member 25 to the pipe member 24.
  • the openings 22 Possible shapes of the openings 22 are exemplarily shown in Fig. 6 to Fig. 9 .
  • the openings 22 can be configured as elongated slots, which are parallel to each other.
  • Other square and/or rectangular shapes of the openings 22 are also possible.
  • the openings 22 can also have a double coned shape such that a boundary of the openings 22 is not rectangular but has inwardly projecting triangles 33 at opposite sides of each one of the openings 22. These triangles 33 modify the generally square hole shape of the openings 22 shown in Fig. 7 . This increases the length of the boundary of the opening 22 compared to a square shaped opening 22. Thus, there is a larger contact area between the gas stream 23 exiting the opening 22 and the primary air 11 which surrounds each one of the gas streams 23. This leads to a higher entrainment of primary air 11.
  • Such a rather long boundary of the opening 22 can also be achieved by a star-like shape of the openings 22 and/or a polygonal shape of the openings 22, wherein the star-like shape is exemplarily shown in Fig. 8 .
  • Fig. 9 shows yet another shape of the openings 22. Accordingly, the openings 22 can also have an arched shape. However, other shapes, dimensions, and arrangements of the openings 22 provided in the wall portion or top plate 21 of the injector nozzle 3 can be provided in order to promote a good mixing of the gas 12 with the primary air 11.
  • the gas stove 1 usually has operating elements 30 for operating the gas burners 2, which can be arranged in an upper part of an oven front 31 of the gas stove 1. Further, the gas stove 1 can have a cooking chamber 32 which may also be heated by gas.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Claims (5)

  1. Dispositif d'injection (3) pour un brûleur à gaz (2) d'un appareil électroménager (1), dans lequel le dispositif d'injection (3) présente une partie tubulaire (20) par laquelle du gaz (12) s'écoule pendant le fonctionnement du brûleur à gaz (2) et une partie de paroi (21) délimitant la partie tubulaire (20), dans lequel la partie de paroi (21) présente un orifice (22) par lequel le gaz sort du dispositif d'injection (3) pendant le fonctionnement du brûleur à gaz (2), dans lequel la partie de paroi (21) présente au moins deux orifices (22) lesquels sont configurés pour diviser un seul flux gazeux s'écoulant à travers la partie tubulaire (20) pendant le fonctionnement du brûleur à gaz (2) en des flux gazeux distincts (23), dans lequel la partie tubulaire (20) comprend une section d'admission fournie par un élément formant conduit (24) du dispositif d'injection (3) et une section terminale fournie par un élément en oméga (25), raccordé à l'élément formant conduit (24) d'une manière amovible, dans lequel l'élément en oméga (25) est fixé d'une manière amovible à l'élément formant conduit (24) au moyen d'un organe de maintien (28), dans lequel l'élément en oméga (25) comprend une partie en collet (26), dans lequel la partie en collet (26) est comprimée contre une face terminale (27) de l'élément formant conduit (24) au moyen de l'organe de maintien (28), dans lequel l'organe de maintien (28) comprend un filet intérieur vissé sur l'élément formant conduit (24) et dans lequel l'élément formant conduit (24) présente un filet extérieur présent sur une surface extérieure (29) de l'élément formant conduit (24).
  2. Dispositif d'injection (3) selon la revendication 1, caractérisé en ce que la partie de paroi est configurée en tant que plaque de dessus (21) du dispositif d'injection (3).
  3. Dispositif d'injection (3) selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les au moins deux orifices (22) présentent une forme arrondie et/ou rectangulaire et/ou carrée et/ou triangulaire et/ou polygonale et/ou en étoile et/ou arquée et/ou à double cône.
  4. Brûleur à gaz (2) comprenant au moins un dispositif d'injection (3) selon l'une quelconque des revendications 1 à 3, dans lequel le au moins un dispositif d'injection (3) est agencé en amont d'un dispositif Venturi (13) du brûleur à gaz (2), dans lequel le dispositif Venturi (13) est configuré pour entraîner de l'air (11) environnant le dispositif d'injection (3) dans une zone de mélange du brûleur à gaz (2).
  5. Appareil électroménager (1) comprenant au moins un brûleur à gaz (2) selon la revendication 4, dans lequel le au moins un dispositif d'injection (3) est agencé sous une plaque de dessus (4) de l'appareil électroménager (1).
EP18816247.3A 2017-12-21 2018-11-26 Dispositif d'injection pour un brûleur à gaz d'un appareil ménager, brûleur à gaz et appareil ménager Active EP3728948B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201731445A ES2717549A1 (es) 2017-12-21 2017-12-21 Dispositivo inyector para un quemador de gas de un aparato domestico, quemador de gas, y aparato domestico
PCT/IB2018/059293 WO2019123052A1 (fr) 2017-12-21 2018-11-26 Dispositif d'injection pour un brûleur à gaz d'un appareil ménager, brûleur à gaz et appareil ménager

Publications (2)

Publication Number Publication Date
EP3728948A1 EP3728948A1 (fr) 2020-10-28
EP3728948B1 true EP3728948B1 (fr) 2024-05-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18816247.3A Active EP3728948B1 (fr) 2017-12-21 2018-11-26 Dispositif d'injection pour un brûleur à gaz d'un appareil ménager, brûleur à gaz et appareil ménager

Country Status (4)

Country Link
EP (1) EP3728948B1 (fr)
CN (1) CN111492179B (fr)
ES (1) ES2717549A1 (fr)
WO (1) WO2019123052A1 (fr)

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CN107339697B (zh) * 2017-04-21 2022-10-21 宁波方太厨具有限公司 一种燃气灶的喷嘴

Also Published As

Publication number Publication date
CN111492179A (zh) 2020-08-04
ES2717549A1 (es) 2019-06-21
CN111492179B (zh) 2023-08-29
EP3728948A1 (fr) 2020-10-28
WO2019123052A1 (fr) 2019-06-27

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