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WO2009137962A1 - 一种多射流燃气燃烧器的引射结构 - Google Patents

一种多射流燃气燃烧器的引射结构 Download PDF

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Publication number
WO2009137962A1
WO2009137962A1 PCT/CN2008/001559 CN2008001559W WO2009137962A1 WO 2009137962 A1 WO2009137962 A1 WO 2009137962A1 CN 2008001559 W CN2008001559 W CN 2008001559W WO 2009137962 A1 WO2009137962 A1 WO 2009137962A1
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WIPO (PCT)
Prior art keywords
venturi
nozzle
centerline
jet
axis
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Application number
PCT/CN2008/001559
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English (en)
French (fr)
Inventor
茅忠群
Original Assignee
宁波方太厨具有限公司
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Application filed by 宁波方太厨具有限公司 filed Critical 宁波方太厨具有限公司
Publication of WO2009137962A1 publication Critical patent/WO2009137962A1/zh

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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
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • 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
    • F23D14/08—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 with axial outlets at the burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14003—Special features of gas burners with more than one nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14642—Special features of gas burners with jet mixers with more than one gas injection nozzles or orifices for a single mixing tube

Definitions

  • This invention relates to a burner for a domestic gas stove, particularly a multi-jet gas burner in which a nozzle and a venturi cooperate to attract a primary air and to sufficiently mix the air and the gas. Background technique
  • the ejector structure is an important part of the gas burner.
  • the ejector structure is usually composed of a venturi and a nozzle disposed at the inlet of the venturi. The gas is injected into the venturi through the nozzle, under the effect of the venturi effect. At the same time, the primary air is drawn into the venturi and partially mixed therein.
  • the existing conventional gas burners each have a nozzle corresponding to a venturi, that is, only one gas flow in a venturi, and most of the burners currently only have two ejector structures, namely one
  • the nozzle and the corresponding outer venturi bear the air supply load of the entire outer ring fire
  • one nozzle and the corresponding inner venturi bear the air supply load of the inner ring fire, so the gas quantity is especially needed once It is difficult to increase the amount of air in essence, so the heat load is relatively low, making it difficult to meet the needs of Chinese families, especially Chinese families.
  • the main technical problem to be solved by the present invention is to provide an ejector structure having two or more gas jets for the current state of the art to improve the ejector capability, mixing effect, combustion efficiency and reduction of existing burners. Smoke emissions.
  • the ejector structure of the multi-jet gas burner of the present invention comprises a nozzle and a venturi, characterized in that the inlet of the venturi is provided with at least two nozzles with an orifice or an upper nozzle A nozzle having at least two orifices, or at least one nozzle having one orifice and at least one nozzle having at least two orifices.
  • the venturi of the ejector structure of the present invention is provided with two or more gas jets.
  • a burner has two or more ejector structures, one of which is an inner ejector structure corresponding to the inner ring fire, and the other is an outer ejector structure corresponding to the outer ring fire.
  • the ejector structure of the present invention can be applied to both the inner ring fire and the outer ring fire, or it can be applied only to the outer ring fire.
  • the ejector structure of the present invention preferably has two modes: one is the axis of one of the nozzle holes and the venturi
  • the centerlines of the tubes coincide, while the axes of the remaining orifices intersect the centerline of the venturi, and the angle of the axis of the orifices with the centerline of the venturi is 2.5-15°.
  • the second is that the axes of the nozzles intersect on the center line of the venturi, and the angle between the axis of the nozzle and the centerline of the venturi is 2.5-15 °.
  • a further preferred angle of intersection in these two preferred modes is 3.5 °.
  • the axes of all the orifices intersect at the same point on the centerline of the venturi, or they may be staggered, but intersect at the same point. excellent.
  • the orifices intersecting the centerline of the venturi are preferably symmetrically and evenly spaced relative to the centerline of the venturi.
  • the present invention is not particularly limited, and may be either a vertical venturi or a horizontal venturi, or even a vertical venturi, and a part of the slant. Arranged venturi tubes, and so on.
  • the number of orifices corresponding to the venturi tube is preferably 2 to 10, preferably 2 to 5.
  • the gas jet is a laminar jet in the venturi tube.
  • the mixing with the air is the process of molecular exchange with the air from the outer surface of the jet and gradually diffusing into the laminar core. That is to say, inside the core of the jet is pure gas, the part outside the jet is pure air, and between the outer boundary of the jet and the core boundary is a gas-air mixture.
  • the multi-stream jet has a smaller laminar flow thickness per jet than the single jet, that is, the air is more easily diffused into the jet, the mixing speed is faster, and the mixing is more sufficient;
  • the axes of the multiple jets intersect, that is, the multiple jets collide with each other in the venturi tube, which can cause the turbulence of the laminar jet and further form a turbulent jet.
  • This patent application unit has carried out a large number of experimental verifications through the experimental model of a single tube and two symmetrical jets, in the same load flow, venturi and damper opening rule.
  • the axis of the jet i.e., the axis of the orifice that injects the jet
  • its CO emissions vary significantly with angle. 0.
  • the CO flue gas is higher, suddenly drops to the lowest point at 2.5°, and then gradually rises. After 15°, the flue gas increases sharply and exceeds the national standard.
  • the efficiency index rises with the rise of the flue gas, but the amplitude is slowed down.
  • the angle A between the axis of the jet and the centerline of the venturi is preferably between 2.5° and 15°. Among them, it is preferably 7°.
  • the patent application unit also carried out a similar experiment with an experimental model of three symmetrical jets in a venturi tube. The experimental results are basically similar to those of the two strands, but the effect is relatively poor.
  • the ejector structure of the present invention uses multiple gas gas phase collision techniques to enhance the priming ability of the primary air and greatly enhance the mixing degree of the gas and the air, thus applying the ejector structure of the present invention.
  • the burner can enhance the air-injecting capacity of the primary air, greatly enhance the mixing degree of gas and air, thereby improving the combustion efficiency and heat load, and reducing the emission of harmful gases in the flue gas.
  • Embodiment 1 is a partial structural schematic view of Embodiment 1 of the present invention.
  • Embodiment 2 is a partial structural schematic view of Embodiment 2 of the present invention.
  • Embodiment 3 is a partial structural schematic view of Embodiment 3 of the present invention.
  • Embodiment 4 is a partial structural schematic view of Embodiment 4 of the present invention.
  • FIG. 5 is a schematic partial structural diagram of Embodiment 5 of the present invention. detailed description
  • the ejector structure of the multi-jet gas burner of the embodiment has a venturi pipe 1, and the air inlet of the venturi pipe 1 is provided with three nozzles having an injection hole in the same plane. 2.
  • the axis of one of the orifices coincides with the centerline of the venturi 1, while the remaining two nozzles are symmetrically arranged with respect to the centerline, and the axes of the two orifices intersect at the centerline of the venturi 1 A point A, the intersection of the axis of the orifice and the centerline of the venturi is 2.5°.
  • Embodiment 2 Embodiment 2
  • the ejector structure of the multi-jet gas burner of the present embodiment has a venturi tube 1, and the air inlet of the venturi is provided with two nozzles 2 having an injection hole in the same plane. .
  • the two nozzles are symmetrically arranged with respect to the centerline of the venturi, and the axes of the two orifices intersect at a point A on the centerline of the venturi 1, the orifice
  • the angle between the axis of the axis and the center line of the venturi is 3.5 °.
  • the ejector structure of the multi-jet gas burner of the present embodiment has a venturi tube 1, and the air inlet of the venturi is provided with two nozzles 2 having an injection hole in the same plane.
  • the axis of one of the orifices intersects a point A on the centerline of the venturi, and the axis of the orifice is at an angle of 3.5° to the centerline of the venturi, and the axis of the other orifice intersects the venturi Another point B on the centerline of the inner tube, and the intersection of the axis of the orifice and the centerline of the venturi is 3.5°.
  • Embodiment 4 Embodiment 4
  • the ejector structure of the multi-jet gas burner of the embodiment has a venturi tube 1, and the air inlet of the venturi is provided with a nozzle 2 with an injection hole and an upper two.
  • the nozzle 3 of the orifice is located, and the nozzle 2 and the nozzle 3 are on the same plane.
  • the positional relationship of the three injection holes is as follows: wherein the axis of one nozzle of the nozzle 3 coincides with the center line of the venturi, and the axes of the other two nozzles intersect on the center line of the venturi A point A, and the intersection of the axis of the orifice and the centerline of the venturi is 2.5°.
  • Embodiment 5 Embodiment 5
  • the ejector structure of the multi-jet gas burner of the embodiment has a venturi tube 1, and the air inlet of the venturi is provided with three symmetrical distributions around the center line of the venturi tube.
  • the nozzle 2 of the orifice, and the axes of the three orifices intersect at a point A on the centerline of the venturi, the intersection of the axis of the orifice and the centerline of the venturi is 3.5.
  • the above embodiment of the ejector structure is actually applied to the burner for experimental discovery, comprehensive smoke, efficiency and visual flame condition.
  • the effect of the second embodiment is optimal
  • the third embodiment The effect is the worst, and the first embodiment is almost indistinguishable from the fourth embodiment.
  • the performance of the fifth embodiment is slightly stronger than that of the first embodiment and the fourth embodiment.

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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)
  • Nozzles For Spraying Of Liquid Fuel (AREA)

Description

9
一种多射流燃气燃烧器的引射结构
技术领域
本发明涉及家用燃气灶用的燃烧器， 特别是多射流燃气燃烧器中通过喷嘴和文丘里管 的配合以吸入一次空气并使空气和燃气得以充分混合的引射结构。 背景技术
引射结构是燃气燃烧器的重要组成部分， 引射结构通常由文丘里管和配置在文丘里管 进气口的喷嘴构成， 燃气经喷嘴喷入文丘里管， 在文丘里管效应作用下， 同时将一次空气 吸入文丘里管并在其中部分混合。
现有的传统燃气燃烧器均是一个喷嘴对应一根文丘里管， 也就是一根文丘里管内只有 一股燃气气流， 且目前大多数的燃烧器仅设置有两个引射结构， 即由一个喷嘴和对应的一 根外文丘里管承担整个外环火的供气负荷、 一个喷嘴和对应的一根内文丘里管承担内环火 的供气负荷， 故其燃气量尤其是所需的一次空气量很难有本质上的提高， 因而热负荷相对 较低， 较难满足中国家庭特别是中国家庭对爆炒的需要。
近年还出现了一类具有多个引射结构的燃烧器， 即具有多喷嘴多文丘里管的燃烧器， 其大多采用立式文丘里管，其中，一个喷嘴和对应的一根文丘里管承担内环火的供气负荷， 而外环火的供气负荷则由多个喷嘴和多根文丘里管承担， 但文丘里管与喷嘴之间仍为一一 对应关系， 也就是说， 一根文丘里管只对应一个喷嘴， 一个喷嘴也只对应一根文丘里管。 该类型燃烧器在热负荷上有所提高， 但是在引射能力、 燃烧效率以及烟气排放等方面仍有 不足。 发明内容
本发明所要解决的主要技术问题在于针对现有技术现状而提供一种具有两股或两股 以上燃气射流的引射结构， 以提高现有燃烧器的引射能力、 混合效果、 燃烧效率并降低烟 气排放。
本发明多射流燃气燃烧器的引射结构， 其包括喷嘴及文丘里管， 其特征在于所述文丘 里管的进气口配置有至少两个上设一个喷孔的喷嘴， 或者配置有一个上设至少两个喷孔的 喷嘴， 或者配置有至少一个上设一个喷孔的喷嘴及至少一个上设至少两个喷孔的喷嘴。 简 而言之， 也就是说， 本发明引射结构的文丘里管内配置有两股或两股以上的燃气射流。
通常的情况是， 一个燃烧器具有两个或两个以上的引射结构， 其一为与内环火相应的 内引射结构， 其余为与外环火相应的外引射结构。 在具体将本发明引射结构应用于燃烧器 时， 既可以将其同时应用于内环火和外环火， 也可以只将其应用于外环火。
为提高燃烧器的引射能力、 混合效果、 燃烧效率及降低烟气排放， 本发明引射结构优 选的方式有二： 其一是所述喷孔中的一个喷孔的轴线与所述文丘里管的中心线重合， 而其 余喷孔的轴线相交于所述文丘里管的中心线上， 且喷孔的轴线与文丘里管的中心线的交角 为 2.5~15° 。 其二是所述喷孔的轴线均相交于所述文丘里管的中心线上， 且喷孔的轴线与 文丘里管的中心线的交角为 2.5~15 ° 。并且，这两种优选方式下进一步的优选交角为 3.5 ° 。
至于喷孔的轴线与文丘里管的中心线的相交方式， 既可以是所有喷孔的轴线均相交于 文丘里管中心线上的同一点， 也可以有所错开， 但以相交于同一点为优。 并且， 所有轴线 与文丘里管中心线相交的喷孔最好是相对于文丘里管的中心线对称、 均匀布置。
至于文丘里管的设置方向， 本发明没有特别的限制， 既可以是均为立式文丘里管， 也 可以均为卧式文丘里管， 甚至是部分为立式文丘里管， 而部分为倾斜布置的文丘里管， 等 等。
对于配置有两股或两股以上的燃气射流的文丘里管而言， 文丘里管所对应的喷孔数以 2~10个为宜， 优选为 2~5个。
本发明引射结构实现本发明目的的原因在于：
1、 由于从喷孔喷出的燃气射流的卷吸效应有一定的范围， 在一定面积的一次空气进 气口上， 将一股气流改为多股气流， 有助于增加一次空气的卷吸量；
2、 家用燃气灶中， 燃气射流在文丘里管内为层流射流， 与空气的混合是从射流的外 表面开始与空气进行分子交换， 并逐步深入扩散到层流核心内部的过程。 也就是说， 在射 流的核心内部为纯燃气， 在射流以外的部分为纯空气， 在射流的外边界和核心边界之间为 燃气-空气的混合物。在相同流量的情况下， 多股射流比单股射流相比， 每股射流的层流厚 度要小， 也就是说空气更容易扩散到射流内部， 混合速度更快， 混合更充分；
3、 多股射流的轴线相交， 即多股射流在文丘管内相互撞击， 能够引起层流射流的紊 乱， 进一步形成紊流射流。 紊流射流内部有许多分子微团的横向脉动， 加强射流与周围空 气之间的质量和动量交换， 且在多股燃气流轴线交角下部的空气被卷吸， 形成一种 "包饺 子"现象， 从而大大加强了燃气与空气的混合过程。
4、 以立式文丘里管内的两股对称射流相互撞击为例， 互撞后又形成一股合成的汇合 流， 最初其垂直界面上射流尺寸有压扁现象， 待互撞射流混合后， 总射流又以一定的扩张 角继续流动， 在水平截面上射流变得更宽。 并且射流交角越大， 射流变形越大， 混合也愈 强烈， 同时能量撞击损失也越大， 射流衰减也越快。 因此， 为减小射流变形和能量损失， 其交角不宜过大； 为了混合更充分， 其交角不宜过小。 本专利申请单位通过以单管两股对 称射流为例的实验模型进行了大量实验验证， 在相同的负荷流量、 文丘里管和风门开口尺 寸的情况下，当射流的轴线 (即喷射该射流的喷孔的轴线)与文丘里管中心线的交角从 0° 增 加到 45° 时， 其 CO排放量随着角度的变化而显著变化。 0。 时 CO烟气较高， 到 2.5° 时 骤然下降到最低点， 然后逐步上升， 超过 15° 以后烟气急剧增加并超过国家标准要求。 与 此同时， 效率指标随着烟气的上升而上升， 只是幅度趋缓， 综合考虑后， 我们认为射流的 轴线与文丘里管中心线的交角 A以在 2.5°〜15° 之间为宜， 其中优选为 7° 。 本专利申请 单位还以文丘里管内配置三股对称射流的实验模型进行了类似的实验， 实验结果与两股的 基本类似， 只是效果相对稍差。
由上可见， 在相同条件下， 本发明引射结构应用多股燃气气流相撞击技术， 能够增强 一次空气的引射能力， 大大加强燃气与空气的混合程度， 因而应用有本发明引射结构的燃 烧器与传统的单管单射流的燃烧器相比较， 能够增强一次空气的引射能力， 大大加强燃气 与空气的混合程度， 从而提高燃烧效率和热负荷， 减少烟气中有害气体的排放。 附图说明
图 1 为本发明实施例一的局部结构示意图；
图 2 为本发明实施例二的局部结构示意图；
图 3 为本发明实施例三的局部结构示意图；
图 4为本发明实施例四的局部结构示意图；
图 5 为本发明实施例五的局部结构示意图。 具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
实施例一
如图 1所示， 本实施例多射流燃气燃烧器的引射结构， 其具有文丘里管 1， 该文丘里 管 1的进气口配置了三个处于同一平面的上设一个喷孔的喷嘴 2。 其中一个喷孔的轴线与 所述文丘里管 1的中心线重合， 而其余两个喷嘴相对于中心线对称布置， 且其二个喷孔的 轴线相交于所述文丘里管 1的中心线上的一点 A, 喷孔的轴线与文丘里管中心线的交角均 为 2.5° 。 实施例二
如图 2所示， 本实施例多射流燃气燃烧器的引射结构， 其具有文丘里管 1， 该文丘里 管的进气口配置了二个处于同一平面的上设一个喷孔的喷嘴 2。 两喷嘴相对于文丘里管的 中心线对称布置， 且其二个喷孔的轴线相交于所述文丘里管 1的中心线上的一点 A， 喷孔 的轴线与文丘里管中心线的交角均为 3.5 ° 实施例三
如图 3所示， 本实施例多射流燃气燃烧器的引射结构， 其具有文丘里管 1， 该文丘里 管的进气口配置了二个处于同一平面的上设一个喷孔的喷嘴 2， 其中一个喷孔的轴线相交 于所述文丘里管的中心线上的一点 A，且喷孔的轴线与文丘里管中心线的交角为 3.5° ，另 一个喷孔的轴线相交于所述文丘里管的中心线上的另一点 B, 且喷孔的轴线与文丘里管中 心线的交角为 3.5° 。 实施例四
如图 4所示， 本实施例多射流燃气燃烧器的引射结构， 其具有文丘里管 1， 该文丘里 管的进气口配置了一个上设一个喷孔的喷嘴 2和一个上设二个喷孔的喷嘴 3， 且喷嘴 2和 喷嘴 3处于同一平面上。 三个喷孔的位置设置关系为： 其中喷嘴 3的一个喷孔的轴线与所 述文丘里管的中心线重合， 而其余二个喷孔的轴线相交于所述文丘里管的中心线上的一点 A, 且喷孔的轴线与文丘里管中心线的交角均为 2.5° 。 实施例五
如图 5所示， 本实施例多射流燃气燃烧器的引射结构， 其具有文丘里管 1， 该文丘里 管的进气口配置了三个绕文丘里管中心线对称分布的上设一个喷孔的喷嘴 2， 且三个喷孔 的轴线相交于所述文丘里管的中心线上的一点 A， 喷孔的轴线与文丘里管中心线的交角为 3.5。 。 将以上实施例引射结构实际应用于燃烧器进行实验发现， 综合烟气、 效率及目视火焰 状况， 以上 5个实施中引射结构中， 以实施例二的效果最优， 实施例三的效果最差， 实施 例一与实施例四几乎没有区别， 实施例五的表现稍强于实施例一、 实施例四的表现。

Claims

权 利 要 求
1、 一种多射流燃气燃烧器的引射结构， 其包括喷嘴及文丘里管， 其特征在于所述文 丘里管的进气口配置有至少两个上设一个喷孔的喷嘴， 或者配置有一个上设至少两个喷孔 的喷嘴， 或者配置有至少一个上设一个喷孔的喷嘴及至少一个上设至少两个喷孔的喷嘴。
2、 根据权利要求 1 所述的引射结构， 其特征在于所述喷孔中的一个喷孔的轴线与所 述文丘里管的中心线重合， 而其余喷孔的轴线相交于所述文丘里管的中心线上， 且喷孔的 轴线与文丘里管的中心线的交角为 2.5~15 ° 。
3、 根据权利要求 2所述的引射结构， 其特征在于所述其余喷孔的轴线相交于所述文 丘里管中心线上的同一点。
4、 根据权利要求 1 所述的引射结构， 其特征在于所述喷孔的轴线均相交于所述文丘 里管的中心线上， 且喷孔的轴线与文丘里管的中心线的交角为 2.5~15° 。
5、 根据权利要求 4所述的引射结构， 其特征在于所述喷孔的轴线相交于所述文丘里 管中心线上的同一点。
6、 根据权利要求 3所述的引射结构， 其特征在于所述喷孔的轴线与文丘里管的中心 线的交角为 3.5 ° 。
7、 根据权利要求 5所述的引射结构， 其特征在于所述喷孔的轴线与文丘里管的中心 线的交角为 3.5° 。
8、 根据权利要求 2至 7中任一权利要求所述的引射结构， 其特征在于所述文丘里管 所对应的喷孔数为 2~10个。
9、根据权利要求 8所述的引射结构，其特征在于所述文丘里管所对应的喷孔数为 2~5 小
PCT/CN2008/001559 2008-05-14 2008-09-01 一种多射流燃气燃烧器的引射结构 WO2009137962A1 (zh)

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