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WO2015019308A1 - Dispositif de régulation de mélange de gaz et d'air dans un système de combustion - Google Patents

Dispositif de régulation de mélange de gaz et d'air dans un système de combustion Download PDF

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Publication number
WO2015019308A1
WO2015019308A1 PCT/IB2014/063753 IB2014063753W WO2015019308A1 WO 2015019308 A1 WO2015019308 A1 WO 2015019308A1 IB 2014063753 W IB2014063753 W IB 2014063753W WO 2015019308 A1 WO2015019308 A1 WO 2015019308A1
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WO
WIPO (PCT)
Prior art keywords
gas
air
mixing tube
injector
assembly
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.)
Ceased
Application number
PCT/IB2014/063753
Other languages
English (en)
Spanish (es)
Inventor
Hector Fabio ARIAS VANEGAS
Claudia Marcela ORREGO ZAPATA
Ruben Dario ESTRADA HERNÁNDEZ
William De Jesus GIL LONDOÑO
Carlos Mario Chica Arrieta
Victor Hugo ECHAVARRÍA VALLEJO
Federico Guillermo FERREIRA LOPEZ
Gabriel Felipe VÁSQUEZ BEDOYA
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.)
INDUSTRIAS HACEB SA
Original Assignee
INDUSTRIAS HACEB SA
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 INDUSTRIAS HACEB SA filed Critical INDUSTRIAS HACEB SA
Publication of WO2015019308A1 publication Critical patent/WO2015019308A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F24C3/12—Arrangement or mounting of control or safety devices
    • 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 combustion systems for domestic purposes, for example stoves that use combustible gases for their operation, and in particular with devices used to perform the combustion operation with various types of combustible gases and at different heights above the level of the sea.
  • SCFD gas combustion systems for domestic purposes
  • a state-of-the-art SCFD commonly comprises:
  • a valve (102) connected to the tube (101), which regulates the flow of gas that is transported by the tube (101), an injector (103) located posterior to the valve (102), which injects the gas that is transported in the tube (101),
  • a mixing tube (104) that receives the gas that is injected by the injector (103).
  • the mixing tube (104) is separated from the injector (103) a certain distance, whereby, when the injected gas enters the mixing tube (104), a pressure drop is generated, sucking the air adjacent to the injector (103) towards the mixing tube (104).
  • the air and gas are mixed.
  • the sucked air is called primary air.
  • SCQS combustion system with sealed burner
  • SCQA combustion system with open burner
  • the amount of air induced to the mixing tube (104) is determined, in large part, by the distance between the injector (103) and the mixing tube (104). Once the air contained in the cover (106) is sucked, the cover is supplied with air that enters through the opening where the mixing tube (104) leaves. Being the primary air sucked from the environment where the combustion of the gas develops, there is the possibility Suction not only the air, but also combustion gases close to the flame, which increases the generation of CO, product of the presence of these gases in combustion.
  • the minimum CO emissions that can occur in the SCQS are 600 to 700 ppm, obtaining thermal efficiencies between 48% and 52%. The above ranges may vary with respect to the height above sea level (hereinafter "ASNM") of the SCQS.
  • Another important aspect for combustion in an SCQS is the distance between the injector (103) and the mixing tube (104). This distance is responsible for the rate of primary air that can carry the gas and is a distance set from the factory, therefore the same SCQS can present differences in the characteristic of combustion at different ASNM, such as CO emissions and thermal efficiency, since the rate of primary air varies and therefore the rate of secondary air will also vary.
  • the mixing tube (104) and the injector (103) are under the table (107) (but not within a defined volume, as in the SCQS).
  • the primary air from the environment is taken under the table (106), which is sucked by the gas into the mixing tube (104).
  • the suction is presented since the outgoing gas of the injector (103) has a dynamic pressure greater than the primary air present in the environment, sufficient to drag the primary air into the mixing tube (104) and subsequently to the burner (105).
  • Being the environment from which the open primary air is taken ie unrestricted access, unlike what happens in the SCQS), there must be no recirculation of combustion gases, and therefore the primary air to be sucked will be substantially free of flue gases.
  • the mixing tube (104) used to drive the mixture of primary air and gas towards the burner (105) has a movement free of movement with respect to its longitudinal axis, which allows the distance between the injector (if handled improperly) 103) and the mixing tube (104) is altered, thus varying the primary air rate and secondary air rate, possibly generating gas leaks, and consequently affecting the amount of CO generated and the thermal efficiency of combustion.
  • the distance between the injector (103) and the mixing tube (104) is responsible for the rate of primary air that can be carried by the gas, and is a factory set distance.
  • SCFDs can operate with different combustion gases. Due to the differences in the physicochemical properties of the gases used, the most common being natural gas (hereinafter GN) and liquefied petroleum gas (hereinafter LPG), when an SCFD is preset to operate with a certain gas and requires operating with other gas, it is necessary to make modifications or changes in its components. For the conversion of an SCFD, when changing from one gas to another, the modification or change of four components or factors is taken into account: the valve, the injector, the minimum gas flow and the air regulation. This last factor is necessary to correct the effect of the change in atmospheric pressure on the SCFD to ensure adequate performance and safety of the appliance.
  • GN natural gas
  • LPG liquefied petroleum gas
  • SCFDs work with a defect of primary air with values ranging between 50% and 70%, that is, 100% of the O2 contained in the air necessary for complete combustion, only enters between 50% and 70%, called the primary air rate, and the The rest is obtained from the air surrounding the flame, called secondary air rate.
  • the primary air rate When increasing the ASNM, the partial pressure of the O2 is reduced, reducing its mass content, which affects combustion incomplete To compensate for this it is necessary to increase the primary air rate by modifying the air regulation.
  • the injector for GN and the knob for GN are assembled on the valve;
  • the LPG injector and LPG knob are assembled to the valve.
  • this document does not disclose a system to easily regulate the air-gas mixture.
  • Patent document US7,458,386 also describes an invention corresponding to a valve for use in gas combustion systems that allows the conversion of GN to LPG and vice versa.
  • the valve comprises 2 injectors, one of larger diameter located at one end where the gas leaves and another internal injector to the smaller diameter valve; The circle centers of both injectors are collinear.
  • the internal injector is mounted on a mechanism that allows the movement on its longitudinal axis into the valve.
  • the mechanism is actuated by a knob located on the outside of the valve, which, when rotated, displaces the mechanism, and consequently the internal injector.
  • the knob has 3 positions: closed in which gas is not allowed to enter the valve, GN to operate with GN and LP to operate with LPG. When the knob is in the closed position, gas is not allowed to enter the valve.
  • the device does not contemplate a mechanism that allows to easily regulate the air-gas mixture. 3. Brief description of the graphics
  • FIG. 1 Scheme of a state of the art SCFD.
  • FIG 2. Scheme of a state of the art SCQS.
  • FIG 3. Scheme of a state of the art SCQA.
  • FIG 4. Preferred mode of the invention.
  • FIG 5. Preferred mode of the mobile assembly of the invention.
  • FIG 6. Path of the gas in the preferred embodiment of the invention.
  • FIG 7. Preferred mode of the fixed assembly of the invention.
  • the present invention corresponds to a device for converting gas into an SCFD which allows the gas injector to be safely and easily changed and to vary the distance between the injector and the mixing tube. Apart from changing the injector and regulating the amount of primary air, the conversion of a combustible gas to another combustible gas does not require modifications to the system or component addition. Additionally, the device allows, through the modification of the primary air rate, to optimize combustion to operate the SCFD at different ASNMs and to control unwanted phenomena in the burner related to flame stability.
  • the present invention in its preferred embodiment relates to a device called a gas-air regulator that allows the conversion of a combustible gas to another in an SCFD, and which, through the modification of the primary air rate, optimizes combustion to operate at different ASNMs and control unwanted phenomena in the burner related to flame stability, such as flashback and flame shedding, yellow tips, and that usually result in high concentrations of CO.
  • the gas-air regulator consists of:
  • a mobile set consisting of:
  • the gas-air regulator is located before the burner and after the fuel gas flow regulating valve.
  • the mobile assembly corresponds to the assembly that moves in the gas-air regulator and through which the gas enters the gas-air regulator.
  • the injector (2), the two female guides (3) and the thread (4) are assembled in the base (1).
  • the pipeline that carries the combustible gas is connected to the inlet of the gas-air regulator, using for example an o-ring elastomer seal that is coupled and blocked in the slots (9).
  • the pipeline that carries the combustible gas is connected at its other end to the fuel gas flow regulating valve.
  • the base (1) can be manufactured in any solid material, such as steel, nickel, brass, zamak and aluminum.
  • the geometry of the base is preferably in 90 ° elbow, since it allows the gas-air regulator to be more compact, facilitating its use in kitchen covers.
  • it can be any, but preferably circular, since it facilitates its connection to hoses and tubes, elements commonly used for the transport of combustible gas and whose transverse geometry is circular.
  • the injector (2) is assembled to the base (1) by any fixing technique such as welding, pressure mounting, glue or other technique, preferably threaded into the base (1), since This alternative allows disassembly and assembly of the injector (2) without causing damage to the base (1). It is required to change the injector (2) when converting fuel gas to another fuel gas, since an injector (2) suitable for the operation of each type of fuel gas is required.
  • the injector (2) has a hole (10) through which the combustible gas from the mobile assembly leaves.
  • the two female guides (3) are assembled to the base (1) at 180 ° a female guide (3) of the other, taking as center the center of the hole (10) of the injector (2) ). Additionally, the longitudinal axes of the female guides (3) must be parallel to each other, and with the center axis of the hole (10).
  • the assembly of the female guides (3) to the base (1) can be carried out by welding, riveting, stamping, screwing, but preferably, their manufacture in the casting of the base (1) should be considered.
  • the internal transverse geometry of the female guides (3) is preferably in T, although it can be in others as cylindrical, square and rectangular.
  • the internal transverse T-geometry of the female guides (3) facilitates the filling of the mold in the foundry and avoids the block between the female guides (3) and the male guides (5) during the movement.
  • the T-geometry allows a clearance between the female guides (3) and the male guides (5) between 0 or 6 or , preferably a maximum clearance of 2 o .
  • the two female guides (3) are for guiding the mobile assembly during vertical movement.
  • the regulation mechanism allows moving the mobile assembly with respect to the fixed assembly, in order to move them away or closer as the case may be.
  • the preferred embodiment for the materialization of this mechanism is the use of screw.
  • the thread (4) is located in the mobile assembly, in the base (1).
  • the thread (4) is assembled to the base (1) preferably by threading the base (1), other alternatives are to press a nut in the base (1), or by placing a nut inside the casting mold, to When the material is emptied into the mold, the nut is inside the base (1).
  • the thread (4) must be of fine pitch.
  • the screw (7) is inserted into the hole (12) of the support (11), the screw (7) being suspended in the support (11).
  • the end of the headless screw (7) is threaded into the thread (4); by turning the screw (7) it is threaded into the thread (4), and therefore displaces the thread (4) vertically and I get the mobile assembly. That is, the rotational movement is converted into a translational movement.
  • the screw (7) must be threaded in its entire length and with a fine pitch thread. If a fine pitch thread screw (7) is used, the thread (4) must also be a fine pitch thread.
  • the displacement will cause the mobile assembly to approach the fixed assembly or move away, that is, if the screw (7) and the thread (4) are in the right direction of rotation, when operating a direction of rotation to the right, the mobile assembly will approach the fixed assembly.
  • Cable pulley A pulley is fixed to the fixed assembly, and a cable is fixed at one of its ends to the pulley and in the other to the mobile assembly, so when winding the cable the mobile assembly is close to the fixed assembly, and the opposite happens when unrolling the wire.
  • This materialization of the regulation mechanism allows unrestricted displacements as in the previous case, since the displacement can be established as a function of the pulley's turning fraction.
  • Crown screw screw In this case the crown would be fixed in the mobile assembly or the fixed assembly, and the worm would be fixed in the assembly to which the crown is not fixed. When turning the crown, the screw and the assembly to which it is fixed is moved. The travel distance is set based on the crown's turn fraction and the crown's arc length.
  • the fixed set is the set that sets the gas-air regulator, and where the gas and air mixture is performed.
  • the fixed assembly consists of two male guides (5), a mixing tube (6), two fixers (8) and a support (11).
  • the two male guides (5) are assembled to the mixing tube (6) at 180 ° a male guide (5) of the other, taking as a pivot point the longitudinal axis of the mixing tube (6).
  • the longitudinal axes of the male guides (5) must be parallel to each other, and with the longitudinal axis of the mixing tube (6).
  • the assembly of the male guides (5) to the mixing tube (6) can be done by welding, riveting, stamping, screwing, but preferably, their manufacture in the melting of the mixing tube (6) should be considered.
  • the external transverse geometry of the male guides (5) is preferably in T, although it can be in others as cylindrical, square and rectangular.
  • the external transverse T-geometry of the male guides (5) facilitates the filling of the mold in the foundry and prevents blockage between the female guides (3) and the male guides (5) during the movement.
  • the T-geometry allows a clearance between the female guides (3) and the male guides (5) between 0 o and 6 o , preferably a maximum clearance of 2 o .
  • the external transverse geometry used in the male guides (5) must be equal to the internal transverse geometry of the female guides (3).
  • the two male guides (5) move inside the female guides (3) during the movement of the mobile assembly which the regulation mechanism is activated.
  • the geometry of the cross section of the mixing tube (6) is circular, that is to say that the mixing tube It is cylindrical in its preferred mode.
  • the mixing tube (6) can have a square, rectangular, triangular transverse geometry among others.
  • the cylindrical geometry of the mixing tube (6) in the preferred mode allows homogeneity of the gas and air mixture at any point of the internal wall of the mixing tube (6)
  • the two fasteners (8) are assembled to the mixing tube (6) at 180 ° one fixer (8) of the other, taking as a turning point the longitudinal axis of the mixing tube (6).
  • the center axes of the holes (13) located in the fasteners (8) must be parallel to each other, and with the longitudinal axis of the mixing tube (6).
  • the assembly of the fasteners (8) to the mixing tube (6) can be done by welding, riveting, stamping, screwing, but preferably, they must be considered its manufacture in the casting of the mixing tube (6).
  • the function of the fasteners (8) is to fix the fixed assembly to a fixed surface where the SCFD is used.
  • the holes (13) located in the fasteners (8) allow the passage of screws, rivets or pins with which to fix the fixed assembly to the fixed surface where the SCFD is used.
  • the fixed assembly comprises the support (11) having the hole (12) and according to FIG 6, the hole (12) is where the screw (7) passes.
  • the male guides (5) are inserted in the female guides (3).
  • the screw (7) is inserted through the hole (12) and threaded with the thread (4), thus obtaining the gas-air regulator assembly.
  • the mixing tube (6) is concentric and aligned with the injector shaft (2), which guarantees that the gas discharge is made towards the mixing tube.
  • the maximum distance L between the mixing tube (6) and the injector (2) is limited by the opening of the gas discharge angle ⁇ and the diameter of the mixing tube (6).
  • the length of the opposite leg of the discharge angle ⁇ must not exceed the diameter of the mixing tube (6) in order to reduce the gas spill.
  • the maximum distance L according to the equation les:
  • the discharge angle ⁇ is between 0 or maximum 22 °.
  • the minimum distance L is 2 mm.
  • the components of the gas-air regulator can be made of any rigid solid material, which withstands temperatures greater than 180 °, which does not generate galvanic torque with the parts that come into contact, and preferably is tough.
  • the static pressure of the gas and air mixture is stabilized resulting in exceeding the atmospheric pressure at the outlet of the mixing tube (6), since the dynamic pressure of the gas and air mixture is superior to that of the environment.
  • the outlet pressure of the mixing tube (6) must be higher than that of the environment, as this avoids the phenomena of flame recoil and flame shedding. According to FIG 6, after the mixing tube (6), the gas and air mixture is conducted inside the SCFD burner.
  • the injector (2) suitable for the type of gas to be used Before using the gas-air regulator, the injector (2) suitable for the type of gas to be used must be installed, and knowing the ASNM in the location of the SCFD, the appropriate distance L is set. It is necessary to adjust the distance L according to the ASNM, since depending on the distance L to be used, the primary air rate is determined in order to ensure combustion without undesirable effects such as flame with yellow tips, flame release, or emissions of CO higher than 800 PPM.
  • the primary air rate should be between 45% and 80%, preferably 70%.
  • an injector (2) suitable for the gas to be used When changing from one gas to another, an injector (2) suitable for the gas to be used must be installed, and the distance L must be adjusted, since the gas to be used will require another aeration rate primary given the chemical and thermodynamic characteristics of each gas for combustion. For example:
  • the primary air rate when changing from GN to LPG, the primary air rate must be increased, and from LPG to GN, the primary air rate must be reduced.
  • the adjustment of the distance L, according to FIG 6, is achieved by turning the screw (7), which is threaded into the thread (4), and therefore the mobile assembly is moved, moving the mobile assembly closer or further away from the assembly. fixed, and therefore bringing the injector (2) away from the mixing tube (6), thus modifying the distance L.
  • the distance L must be increased between 1 mm and 3 mm. In the event of flame shedding, the distance L must be reduced between 1 mm and 3 mm.
  • Mixer tube diameter (6) is 13 mm.
  • a screw (7) M3 with a length greater than or equal to 5 cm long is used with a thread pitch of 0.5 mm and a right direction of rotation of the screw threads (7).
  • Burner power 2 kW.
  • maximum L is 37.8 mm.
  • the distance traveled by each turn of the screw (7) is 0.5 mm, for every two turns of the screw (7), 1 mm.
  • an injector (2) suitable for GN (the required injector is obtained commercially) is assembled in the base (1), and the gas-air regulator in the SCFD is assembled between the burner and the pipe that gas transportation
  • the distance L between the injector (2) and the mixing tube is 5 mm. This distance L is adjusted by turning the screw (7) and consequently moving the moving assembly until the separation distance is achieved L. Under the given conditions, and the assembly performed, a thermal efficiency between 58% and 62% is achieved. The exact value will depend on the separation distance between the heating object and the flame that is generated, since if they are in contact the heat transfer is by conduction; if they are not in contact the transfer is by convection. Additionally, CO emissions of 600 ppm or less are obtained and flame phenomena with amanilla tips and flame shedding are avoided. Case 2
  • a screw (7) M3 with a length greater than or equal to 5 cm long is used with a 0.5 mm thread pitch and a right direction of rotation of the screw threads
  • the distance traveled by each turn of the screw (7) is 0.5 mm, for every two turns of the screw (7), 1 mm.
  • an injector (2) suitable for LPG (the required injector is obtained commercially) is assembled in the base (1).
  • the gas-air regulator is assembled in the SCFD between the burner and the gas transport pipe.
  • the distance L between the injector (2) and the mixing tube must be 15 mm, this distance L is adjusted by turning the screw (7) and by consequently moving the mobile assembly, until the separation distance is achieved L.
  • the distance L In case the assembly of case 1 is used, once If the injector (2) has been replaced with a suitable LPG injector, the distance L must be modified from 5 mm (distance used in case 1) to 15 mm (distance used in case 2) by turning the screw (7) properly .
  • the distance between the injector (2) and the mixing tube (6) is checked with a measuring instrument.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

La présente invention concerne un dispositif de conversion d'un gaz à un autre dans un système de combustion à usage domestique (SCFD), régulant le taux d'air primaire pour le mélange de gaz et d'air à différentes hauteurs au-dessus du niveau de la mer, et permettant de réguler les émissions de CO. Pour la conversion d'un gaz à un autre, on utilise un injecteur approprié pour le gaz à utiliser et l'on modifie la distance entre l'injecteur et un tube mélangeur où s'effectue le mélange de gaz et d'air, la distance entre l'injecteur et le tube de mélange devant être ajustée en tenant compte de l'angle de décharge du gaz, du diamètre du tube mélangeur, des caractéristiques thermodynamiques du gaz et de la hauteur au-dessus du niveau de la mer. Le dispositif, appelé régulateur gaz-air, comprend un ensemble fixe, un mécanisme de régulation et un ensemble mobile, le mécanisme de régulation éloignant ou rapprochant l'ensemble mobile de l'ensemble fixe, modifiant ainsi la distance de l'injecteur par rapport au tube mélangeur et, par conséquent, le taux d'air primaire.
PCT/IB2014/063753 2013-08-09 2014-08-07 Dispositif de régulation de mélange de gaz et d'air dans un système de combustion Ceased WO2015019308A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CO13-190036 2013-08-09
CO13190036A CO7180030A1 (es) 2013-08-09 2013-08-09 Dispositivo para regulación de mezcla de gas y aire en un sistema de combustión

Publications (1)

Publication Number Publication Date
WO2015019308A1 true WO2015019308A1 (fr) 2015-02-12

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PCT/IB2014/063753 Ceased WO2015019308A1 (fr) 2013-08-09 2014-08-07 Dispositif de régulation de mélange de gaz et d'air dans un système de combustion

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CO (1) CO7180030A1 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110425582A (zh) * 2019-07-31 2019-11-08 安徽冠东科技有限公司 一种旋转式燃气燃烧调节装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR581354A (fr) * 1924-05-06 1924-11-27 Injecteur mélangeur pour rampe à gaz permettant le réglage de l'air et du gaz et plus spécialement adaptable aux tubes de fer du commerce
US2857961A (en) * 1954-07-13 1958-10-28 Brown Fintube Co Oil burners
GB944286A (en) * 1959-04-11 1963-12-11 Cannon Ind Ltd Improvements relating to gas burners of cooker hotplates
US3914093A (en) * 1973-01-18 1975-10-21 Flaregas Eng Ltd Combustion apparatus
GB2100411A (en) * 1981-06-12 1982-12-22 Sabaf Spa Burner for gas cookers and hobs
DE8815084U1 (de) * 1987-12-03 1989-01-19 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Gasbrenner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR581354A (fr) * 1924-05-06 1924-11-27 Injecteur mélangeur pour rampe à gaz permettant le réglage de l'air et du gaz et plus spécialement adaptable aux tubes de fer du commerce
US2857961A (en) * 1954-07-13 1958-10-28 Brown Fintube Co Oil burners
GB944286A (en) * 1959-04-11 1963-12-11 Cannon Ind Ltd Improvements relating to gas burners of cooker hotplates
US3914093A (en) * 1973-01-18 1975-10-21 Flaregas Eng Ltd Combustion apparatus
GB2100411A (en) * 1981-06-12 1982-12-22 Sabaf Spa Burner for gas cookers and hobs
DE8815084U1 (de) * 1987-12-03 1989-01-19 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Gasbrenner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110425582A (zh) * 2019-07-31 2019-11-08 安徽冠东科技有限公司 一种旋转式燃气燃烧调节装置

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