201217709 六、發明說明： c發明戶斤屬之技術領域3 發明領域 本發明係關於一種氣體燃燒器，係具有環狀主燃燒器 及配置於該主燃燒器之中央部的中央燃燒器者。201217709 VI. INSTRUCTIONS: C TECHNICAL FIELD OF THE INVENTION The present invention relates to a gas burner having an annular main burner and a central burner disposed at a central portion of the main burner.
L 1L 發明背景 習知有一種氣體燃燒器為人所知，其係於環狀主燃燒 器之中央部設置中央燃燒器，而將燃料氣體與一次空氣的 混合氣體分配供給至主燃燒器和中央燃燒器來使其燃燒 (參照專利文獻1)。 上述氣體燃燒器中，由中央燃燒器内部的分佈室放射 狀地延伸的氣體供給通路，係連通至主燃燒器内部所形成 的環狀分佈室，而供給至主燃燒器的混合氣體則透過氣體 供給通路也供給至中央燃燒器。 【先行技術文獻】 【專利文獻】 【專利文獻1】日本實公昭61-26734號公報（第1圖、 第2圖） 【發明内容】 發明欲解決之課題 惟，就經過主燃燒器將混合氣體供給至中央燃燒器之 構造而言，主燃燒器分佈室内之混合氣體的一部分會產生 朝向中央燃燒器之流動。因此，有主燃燒器之環狀分佈室 3 201217709 整個周邊的混合氣體分佈不均之問題。 有鑑於此，本發明之目的在於提供一種氣體燃燒器， 其係可使混合氣體確實地分配分佈於主燃燒器及中央燃燒 器，不論火力皆可得到良好燃燒。 用以解決課題之手段 本發明係一種氣體燃燒器，包含有：環狀主燃燒器； 中央燃燒器，係配置設於該主燃燒器之中央部者；氣體導 入室，係隔著分隔壁相連設置於該中央燃燒器之下部者； 筒狀喉部，係上游端與喷出燃料氣體之喷嘴相對向，可與 燃料氣體一同取入一次空氣而開放，且下游端於前述氣體 導入室之底部朝上開口；複數主燃燒器用氣體供給通路， 係自前述氣體導入室朝水平方向放射狀地延伸而連接於前 述主燃燒器，並將由前述喉部已導入至前述氣體導入室之 燃料氣體和一次空氣之混合氣體供給至前述中央燃燒器 者；及中央燃燒器用氣體供給通路，係自於前述分隔壁之 下面開口的入口引入前述氣體導入室的混合氣體，並供給 至前述中央燃燒器者，其特徵在於：在與前述分隔壁下面 之前述喉部的下游端開口相對向之區域外側、且於彼此相 鄰之前述主燃燒器用氣體供給通路之間，設有前述中央燃 燒器用氣體的入口；在較前述中央燃燒器用氣體供給通路 的入口水平方向外側且彼此相鄰之前述主燃燒器用氣體供 給通路之間，設有供沿著前述分隔壁的下面流動之混合氣 體碰碰撞的側面壁。 依據本發明，首先，當自喷嘴向前述喉部的上游端喷 4 201217709 出燃料氣體時，周圍的空氣會因燃料氣體的流動而作為燃 燒用的一次空氣被捲入喉部，燃料氣體和一次空氣的混合 氣體會自喉部進入前述氣體導入室。 喉部之下游端於氣體導入室的底部朝上開口。因此， 進入氣體導入室的混合氣體會碰撞到位於喉部下游端正上 方之前述分隔壁的下面。碰撞到分隔壁下面之混合氣體會 變為沿著分隔壁下面水平地擴散般之氣流，朝前述主燃燒 器用氣體供給通路或前述中央燃燒器用氣體供給通路流 動。 流向主燃燒器用氣體供給通路的混合氣體係通過主燃 燒器用氣體供給通路而進入主燃燒器内。由於主燃燒器用 氣體供給通路為放射狀地設置複數個，因此通過這些主燃 燒器用氣體供給通路之混合氣體，會被有效率地引導到主 燃燒器的内部，並在環狀主燃燒器的整個周邊均一地分佈。 另一方面，流向主燃燒器用氣體供給通路以外的混合 氣體則流向中央燃燒器用氣體供給通路。此時，中央燃燒 器用氣體供給通路的入口係設於彼此相鄰的主燃燒器用氣 體供給通路之間，因此可防止朝向主燃燒器用氣體供給通 路之混合氣體流因朝向中央燃燒器用氣體供給通路之混合 氣體流而受到阻礙。 在此，本發明係將中央燃燒器用氣體供給通路之入 口，設於與分隔壁下面之喉部下游端開口相對向之區域外 側。藉此，自喉部下游端朝上流動的混合氣體，便不會直 線地侵入中央燃燒器用氣體供給通路而不改變其流動方 5 201217709 向，防止混合氣體過剩供給至中央燃燒器。 惟，由於中央燃燒器用氣體供給通路之入口在分隔壁 的下面開口，因此特別是以大火力燃燒而混合氣體的流速 比較快時，將無法大幅地改變流動方向，其大部分不會進 入中央燃燒器用氣體供給通路而朝水平方向通過。 因此，本發明係設置前述側面壁，使朝向中央燃燒器 用氣體供給通路的混合氣體碰撞側面壁。藉此，不進入中 央燃燒器用氣體供給通路而朝水平方向通過的混合氣體， 會碰撞到側面壁而改變流動方向，流向中央燃燒器用氣體 供給通路。故，即使是以大火力燃燒而混合氣體之流速較 快時，也可將足量的混合氣體可供給至中央燃燒器。 如此一來，依據本發明，可將混合氣體確實地分配於 主燃燒器和中央燃燒器而無過與不足分佈之狀況，無論火 力皆可得到良好的燃燒。 又，本發明中，宜在與前述分隔壁下面之前述喉部下 游端開口對應之位置，設置朝該開口隆起的隆起部。該隆 起部係於其外周形成高低差。藉此，來自喉部的混合氣體 會碰撞分隔壁下面的隆起部，變為沿著隆起部水平擴展的 氣流後，藉由隆起部外周的高低差促進氣體朝前述主燃燒 器用氣體供給通路及前述中央燃燒器用氣體供給通路之流 動。故，來自喉部之混合氣體會經過主燃燒器用氣體供給 通路及前述中央燃燒器用氣體供給通路，順暢地供給至主 燃燒器及中央燃燒器，而可得到更良好的燃燒。 圖式簡單說明 6 201217709 第1圖係顯示本發明實施形態之氣體燃燒器之立體圖。 第2圖係本實施形態之氣體燃燒器之剖面說明圖。 第3圖係分解顯示本實施形態之氣體燃燒器主要部分 之立體圖。 第4圖係上下翻轉顯示本實施形態之燃燒頭之立體圖。 第5圖係顯示喉部與中央燃燒器用氣體供給通路之位 置關係的剖面說明圖。 【實施方式3 用以實施發明之形態 根據圖式說明本發明之實施形態。如第1圖所示，本發 明實施形態之氣體燃燒器1具有燃燒頭2、支架3，且如第2 圖所示，設有氣體爐的爐本體4。 爐本體4雖未詳細圖示，但為上面開放的箱子形狀，於 開放的爐本體4上面設有頂板5。頂板5設有燃燒器用開口 6，燃燒頭2通過燃燒器用開口6朝頂板5之上方露出。又， 支架3透過底架7固定於爐本體4之底部。而且雖未圖示，燃 燒器用開口 6之周圍的頂板5上載置有火架，可藉由於火架 上載置鍋具等調理容器來進行加熱調理。 如第1圖及第2圖所示，燃燒頭2具有環狀主燃燒器8及 設於主燃燒器8之中央部之中央燃燒器9，如第2圖所示，喉 部10連結於中央燃燒器9之下方位置。 如第2圖及第3圖所示，中央燃燒器9由成為底部的分隔 壁11、自分隔壁11的周緣豎立的圓筒狀周壁12、載置在周 壁12上覆蓋中央燃燒器9上面的中央燃燒器蓋13構成。 7 201217709 如第3圖所示，於中央燃燒器9的周壁i2存有圓周方向 形❹㈣度相異的溝槽。將中絲燒器蓋13載 、、央燃燒器9的周壁12上時’會形成由分隔壁U、周壁 12以及中央燃燒器蓋13所包圍的空間，此空間可做為中 央燃燒器9的中央燃燒器分佈室。同時，中央燃燒器9之周 壁12之前述溝槽上面被中央燃燒器蓋13覆蓋而產生孔洞， 如第!圖所示，於中央燃燒器9之外周劃分成多個焰孔… 又’第3圖中係以溝槽作為焰孔來標示符號。 T第2圖所示’中央燃燒器9下部形成有氣體導入室 1二氣體導入室16透過前述分隔㈣鄰接於中央燃燒器分 佈室。如第2圖和第3圖所示，中央燃燒器分佈室丨彳與氣體 導入至16藉由上下貫通分隔壁u之中央燃燒器用氣體供給 通路17而連通。 主燃燒器8係由外周壁18、於與外周壁關心之内側存 有預定間隔而設置之内周壁19、載置於外周壁18和内周壁 19的上緣而覆蓋主燃燒器8的外周壁18之環狀主燃燒器蓋 20、以及一體地相連設置於前述喉部1〇且朝其外側伸出之 圓盤狀底板21所構成。 如第3圖所示，於主燃燒器8的外周壁18存有圓周方向 的間隔，形成多個深度相異之溝槽。因此，如第2圖所示， 當於主燃燒器8的外周壁18以及内周壁19上載置主燃燒器 蓋20時，會形成由底板21、外周壁18、内周壁19及主燃燒 器蓋20所包圍的空間，而可將此空間作為主燃燒器8的主燃 燒器分佈室22。同時，主燃燒器8的外周壁18前述溝槽的上 201217709 面會被主燃燒器蓋20覆蓋產生連通至主燃燒器分佈室22的 孔洞，如第1圖所示，主燃燒器8的外周可劃分成多個焰孔 23。 如第1圖至第3圖所示，於中央燃燒器9與主燃燒器8之 間設有沿圓周方向存有預定間隔且朝水平方向放射狀延伸 的四個連結部24,藉由該連結部24，中央燃燒器9與主燃燒 器8係成為一體。且，各連結部24的内部形成有後述之主燃 燒器用氣體供給通路25。 又，如第1圖和第2圖所示，各連結部24之上部形成有 突起26。各突起26係内側端抵接中央燃燒器蓋13外周緣， 外側端抵接主燃燒器蓋20之内周緣。藉此，可定位限制中 央燃燒器蓋13及主燃燒器蓋2〇來防止各自偏離位置。 如第2圖所示，將喉部10形成使軸線朝向鉛直方向之圓 筒狀，喉部10的下游端（上端）朝氣體導入室向上開口， 上游端（下端）係面向後述之喷嘴27的前端。 喉部10保持於前述支架3。支架3由連結固定至底架7 的基部28 '直立設置於該基部28一邊的支持柱部四、和藉 由支撑柱部29部分支撐而插著保持喉部1〇之保持部3〇構 成。基部28、支持柱部29、及保持部30由鋁合金等金屬塊 一體形成。 支架3的基部28内部形成有燃料氣體的氣體通路31，其 上方安裝有連通於氣體通路31的喷嘴27。喷嘴27將燃料氣 體朝垂直上方喷射。燃料氣體由喷嘴27向喉部1〇喷出時， 該燃料氣體會捲入周圍空氣做為一次空氣並進入喉部，在 201217709 喉部ίο内部及前述氣體導人室16生成燃料氣體和___次空氣 之混合氣體。 ； 又，形成氣體導入室16上部之前述分隔壁⑽下面係 形成有朝喉部ίο的下游端開口隆起之隆起部32。隆起部以 設於與喉部10的下游端開口相對應的區域，且其周圍形成 有南低差33。 在此，詳細說明主燃燒器用氣體供給通路25及中央燃 燒器用氣體供給通路17。 如第2圖所示，主燃燒器用氣體供給通路25形成於連結 部24之内部，且其底面藉由與喉部一體的底板加閉塞。 且’氣體導人室16與域脑分佈室22藉由线燒器用氣 體供給通路25連通’將混合氣體供給至主燃燒器分佈室22。 如第3圖所示’與喉部1()_體的底板21係在主燃燒器用 氣體供給通路25底部之位置形成凹部34，使混合空氣之流 動剖面面積較大。又，位於與彼此相鄰之連結部24之間對 應之位置的底板21形成有貫通孔35，使中央燃燒器9之燃燒 用二次空氣可流動。而，如同於第4圖使燃燒頭2上下翻轉 顯示，主燃燒器8的内面側形成有複數凸部36。如第3圖所 示，這些凸部36會卡合於底板21所形成之複數卡合孔37。 且，如第4圖所示，彼此相鄰之主燃燒器用氣體供給通 路25之間設有中央燃燒器用氣體供給通路17的入口。妒第4 圖和第5圖所示，中央燃燒器用氣體供給通路17之入口供於 隆起部32外側。因此，中央燃燒器用空氣供給通路17力入 口係位於與分隔壁11下面之喉部1〇下游端開口相對向厶遴 201217709 域的外側。再者’中央燃燒器'用氣體供給通如入口附近 形成有兩面構成之側面壁38而包圍該入口之—側。側面壁 38位於較中央織㈣氣體供給通別认^靠水平方向外 側’且位於彼此祕之域脑用氣體供給通路Μ之間。 依據上述構成’參照第2圖，當由喷嘴27朝向喉部1〇 上游端開口喷射燃料氣體時，燃料氣體會—面自周圍捲入 空氣做為—次空氣—面進人喉部1()，生成燃料氣體與一次 空氣混合之混合氣體。該混合氣體自喉部1()下游端開口進 入氣體導人室16，碰撞分隔壁u下面。碰撞到分隔壁π 面的混合氣體脫離喉部10上緣與分隔壁丨丨下面之間後會沿 分隔壁11下面散佈，形成朝主燃燒器用氣體供給通路25之 氣流和朝中央燃燒器用氣體供給通路17之氣流。 此時，由於在與喉部10下游端開口對應之領域之分隔 壁11的下面設紐起部32，因此混合氣體在改變為沿著隆 起部32水平祕散岐錢，會略起部Μ外肖之高低差 33，被朝主燃燒器錢體供給通路25及中央職器用氣體 供給通路17引導並順暢地流動。 朝向主燃燒器用氣體供給通路25之混合氣體會通過主 燃燒器用氣體供給叫25以主錄^㈣线燒器分佈 室22 ’並以均等分佈之狀態流向各焰孔23。 另方面，机向主燃燒器用氣體供給通路25以外的混 °氣體曰机向中央蠛繞器用氣體供給通路17。如第4圖所 示’中央燃燒器用氣體供給通路17之人口設於彼此相鄰之 主燃燒器賴體供給通路25之間。藉此，可各自分別形成 201217709 朝中央燃燒器用氣體供給通路17之氣流和朝主燃燒器用氣 體供給通路25之氣流。因此，朝向主燃燒器用氣體供給通 路25之混合氣體氣流幾乎不會受朝中央燃燒器用氣體供給 通路17之混合氣體氣流影響，可對主燃燒器8供給充分量之 混合氣體。 又，如第5圖所示，中央燃燒器用氣體供給通路17之入 口位於與分隔壁11下面之喉部10下游端開口相對向之區域 的外側，因此自喉部10下游端向上流動的混合氣體不會不 改變其流動方向而直線地侵入中央燃燒器用氣體供給通路 17，可防止過剩供給混合氣體至中央燃燒器9。 再者，如第5圖所示，朝向中央燃燒器用氣體供給通路 17之混合氣體會碰撞側面壁38，因此流動方向被改變而確 實地流入中央燃燒器用氣體供給通路17之入口。藉此，即 使是以大火力燃燒而混合氣體流速較快時，足量的混合氣 體仍會通過中央燃燒器用氣體供給通路17進入中央燃燒器 9的中央燃燒器分佈室14，以均等分佈的狀態流向各焰孔 15 〇 而，本實施形態如第4圖所示，側面壁38雖以兩面構 成，但側面壁38之形狀不限於此，舉例言之，亦可形成沿 著中央燃燒器用氣體供給通路17彎曲之半圓形狀。 又，本實施形態中，雖顯示設有4個連結部24而具有4 個主燃燒器用氣體供給通路25，但連結部24及主燃燒器用 氣體供給通路25的數量不限於4個。惟，若考慮由氣體導入 室16均勻地供給混合氣體到主燃燒器分佈室22，連結部24 12 201217709 及主燃燒器用氣體供給通路25的數量宜設置複數個。 又，本實施形態中，雖顯示於分隔壁下面設置隆起部 32，藉此在隆起部32外周設有高低差33，但只要可充分獲 得自氣體導入室16朝水平方向擴散的混合氣體氣流，不設 隆起部32亦可。 I：圖式簡單說明3 第1圖係顯示本發明實施形態之氣體燃燒器之立體圖。 第2圖係本實施形態之氣體燃燒器之剖面說明圖。 第3圖係分解顯示本實施形態之氣體燃燒器主要部分 之立體圖。 第4圖係上下翻轉顯示本實施形態之燃燒頭之立體圖。 第5圖係顯示喉部與中央燃燒部用氣體供給通路之位 置關係的剖面說明圖。 【主要元件符號說明 1.. .氣體燃燒器 2.. .燃燒頭 3.. .支架 4.. .爐本體 5.. .頂板 6.. .燃燒器用開口 7.. .底架 8.. .主燃燒器 9.. .中央燃燒器 10.. .喉部 1 11.. .分隔壁 12.. .周壁 13.. .中央燃燒器蓋 14.. .中央燃燒器分佈室 15.. .焰孔 16.. .氣體導入室 17.. .中央燃燒器用氣體供給通 路 18.. .外周壁 19.. .内周壁 13 201217709 20...主燃燒器蓋 30...保持部 21...底板 31...氣體通路 22...主燃燒器分佈室 32...隆起部 23...焰孔 33...高低差 24...連結部 34.··凹部 25…主燃燒器用氣體供給通路 35...貫通孔 26...突起 36...凸部 27...喷嘴 37...卡合孔 28...基部 38...側面壁 29...支持柱部 14BACKGROUND OF THE INVENTION There is a gas burner known in the art in which a central burner is disposed at a central portion of an annular main burner, and a mixed gas of fuel gas and primary air is distributed to a main burner and a center. The burner burns it (see Patent Document 1). In the gas burner described above, the gas supply passage radially extending from the distribution chamber inside the central burner is connected to the annular distribution chamber formed inside the main burner, and the mixed gas supplied to the main burner is permeated through the gas. The supply passage is also supplied to the central burner. [Patent Document] [Patent Document 1] Japanese Patent Publication No. 61-26734 (Fig. 1 and Fig. 2) [Disclosure] The problem to be solved by the invention is that the mixed gas is passed through the main burner. In the configuration supplied to the central burner, a portion of the mixed gas in the main burner distribution chamber produces a flow toward the central burner. Therefore, there is a problem that the mixed gas distribution of the entire periphery of the annular distribution chamber 3 201217709 of the main burner is uneven. In view of the above, it is an object of the present invention to provide a gas burner which can reliably distribute a mixed gas to a main burner and a central burner to obtain good combustion regardless of fire power. Means for Solving the Problems The present invention relates to a gas burner comprising: an annular main burner; a central burner disposed at a central portion of the main burner; and a gas introduction chamber connected by a partition wall The tubular throat is disposed at an upstream end opposite to the nozzle for discharging the fuel gas, and can be opened with the fuel gas to be opened once, and the downstream end is at the bottom of the gas introduction chamber. a plurality of main burner gas supply passages extending radially from the gas introduction chamber in a horizontal direction to be connected to the main burner, and the fuel gas introduced into the gas introduction chamber by the throat portion and once The air-mixed gas is supplied to the central burner; and the central burner gas supply passage is introduced into the gas inlet chamber from the inlet opening at the lower surface of the partition wall, and is supplied to the central burner. Characterized by: outside the region opposite to the downstream end opening of the throat portion below the partition wall, and The inlet of the central burner gas is provided between the adjacent main burner gas supply passages, and the main burner gas supply passage is adjacent to each other in the horizontal direction of the inlet of the central burner gas supply passage. Between the side walls provided for the collision of the mixed gas flowing along the lower surface of the partition wall. According to the present invention, first, when the fuel gas is sprayed from the nozzle to the upstream end of the throat, the surrounding air is taken into the throat by the flow of the fuel gas as the primary air for combustion, and the fuel gas is once The mixed gas of air enters the aforementioned gas introduction chamber from the throat. The downstream end of the throat opens upward at the bottom of the gas introduction chamber. Therefore, the mixed gas entering the gas introduction chamber collides with the lower side of the aforementioned partition wall directly above the downstream end of the throat. The mixed gas that has collided under the partition wall becomes a gas stream that spreads horizontally along the lower surface of the partition wall, and flows toward the main burner gas supply passage or the central burner gas supply passage. The mixed gas system flowing to the main burner gas supply passage enters the main burner through the main burner gas supply passage. Since a plurality of gas supply passages for the main burner are radially provided, the mixed gas passing through the main burner gas supply passages is efficiently guided to the inside of the main burner and is entirely throughout the annular main burner. The surroundings are evenly distributed. On the other hand, the mixed gas flowing out of the main burner gas supply passage flows to the central burner gas supply passage. In this case, since the inlet of the gas supply passage for the central burner is disposed between the main burner gas supply passages adjacent to each other, it is possible to prevent the mixed gas flow toward the main burner gas supply passage from being directed toward the central burner gas supply passage. The mixed gas flow is hindered. Here, in the present invention, the inlet of the gas supply passage for the center burner is provided on the outer side of the region opposite to the opening at the downstream end of the throat at the lower side of the partition wall. Thereby, the mixed gas flowing upward from the downstream end of the throat does not directly intrude into the gas supply passage for the central burner without changing the flow direction thereof, and prevents excessive supply of the mixed gas to the central burner. However, since the inlet of the gas supply passage for the central burner is opened below the partition wall, especially when the flow rate of the mixed gas is relatively high when the combustion is performed with a large firepower, the flow direction cannot be greatly changed, and most of the gas does not enter the central combustion. The device passes through the gas supply passage and passes in the horizontal direction. Therefore, in the present invention, the side wall is provided such that the mixed gas toward the central burner gas supply passage collides with the side wall. As a result, the mixed gas that does not enter the gas supply passage of the central burner and passes in the horizontal direction collides with the side wall to change the flow direction, and flows to the central burner gas supply passage. Therefore, a sufficient amount of the mixed gas can be supplied to the central burner even when the flow rate of the mixed gas is relatively high when the combustion is performed with a large fire power. As a result, according to the present invention, the mixed gas can be surely distributed to the main burner and the central burner without excessive or insufficient distribution, and good combustion can be obtained regardless of the fire. Further, in the invention, it is preferable that a ridge portion which is raised toward the opening is provided at a position corresponding to the opening of the lower end of the throat at the lower side of the partition wall. The ridges form a height difference on the outer circumference thereof. Thereby, the mixed gas from the throat collides with the ridge portion under the partition wall, and becomes a gas flow extending horizontally along the ridge portion, and then the gas is supplied to the main burner gas supply passage by the height difference of the outer periphery of the ridge portion and the aforementioned The flow of the gas supply passage for the central burner. Therefore, the mixed gas from the throat passes through the main burner gas supply passage and the central burner gas supply passage, and is smoothly supplied to the main burner and the central burner to obtain better combustion. BRIEF DESCRIPTION OF THE DRAWINGS 6 201217709 Fig. 1 is a perspective view showing a gas burner according to an embodiment of the present invention. Fig. 2 is a cross-sectional explanatory view of the gas burner of the embodiment. Fig. 3 is a perspective view showing the main part of the gas burner of the embodiment. Fig. 4 is a perspective view showing the combustion head of the embodiment in an upside down manner. Fig. 5 is a cross-sectional explanatory view showing the positional relationship between the throat and the gas supply passage for the central burner. [Embodiment 3] Mode for Carrying Out the Invention An embodiment of the present invention will be described based on the drawings. As shown in Fig. 1, a gas burner 1 according to an embodiment of the present invention has a burner head 2 and a holder 3, and as shown in Fig. 2, a furnace body 4 of a gas furnace is provided. Although not shown in detail, the furnace body 4 has a box shape in which the upper surface is opened, and a top plate 5 is provided on the upper surface of the open furnace body 4. The top plate 5 is provided with an opening for a burner 6, and the burner head 2 is exposed to the top of the top plate 5 through the opening 6 for the burner. Further, the bracket 3 is fixed to the bottom of the furnace body 4 through the chassis 7. Further, although not shown, a flame frame is placed on the top plate 5 around the opening 6 for the burner, and the conditioning can be carried out by placing a conditioning container such as a pan on the fire holder. As shown in Figs. 1 and 2, the burner head 2 has an annular main burner 8 and a central burner 9 provided at a central portion of the main burner 8. As shown in Fig. 2, the throat 10 is coupled to the center. Below the burner 9. As shown in Figs. 2 and 3, the center burner 9 has a partition wall 11 which is a bottom portion, a cylindrical peripheral wall 12 which is erected from the periphery of the partition wall 11, and a center which is placed on the peripheral wall 12 and covers the upper surface of the central burner 9. The burner cover 13 is constructed. 7 201217709 As shown in Fig. 3, grooves having different circumferential shapes (four degrees) are present in the peripheral wall i2 of the center burner 9. When the middle wire burner cover 13 is loaded on the peripheral wall 12 of the central burner 9, a space surrounded by the partition wall U, the peripheral wall 12 and the central burner cover 13 is formed, and this space can be used as the central burner 9. Central burner distribution room. At the same time, the above-mentioned groove of the peripheral wall 12 of the central burner 9 is covered by the central burner cover 13 to form a hole. As shown in the figure, the outer portion of the central burner 9 is divided into a plurality of flame holes... In the figure, a groove is used as a flame hole to mark a symbol. T shown in Fig. 2, a lower portion of the central burner 9 is formed with a gas introduction chamber. The two gas introduction chambers 16 are adjacent to the central burner distribution chamber through the partition (4). As shown in Figs. 2 and 3, the central burner distribution chamber 丨彳 and the gas introduction 16 are communicated by the central burner gas supply passage 17 which penetrates the partition wall u up and down. The main burner 8 covers the outer peripheral wall of the main burner 8 by the outer peripheral wall 18, the inner peripheral wall 19 provided at a predetermined interval from the inner side of the outer peripheral wall, and the upper peripheral wall 18 and the upper peripheral wall 19. The annular main burner cover 20 of 18 and the disc-shaped bottom plate 21 integrally connected to the throat portion 1 and projecting outward are formed. As shown in Fig. 3, a circumferential gap is formed in the outer peripheral wall 18 of the main burner 8, and a plurality of grooves having different depths are formed. Therefore, as shown in Fig. 2, when the main burner cover 20 is placed on the outer peripheral wall 18 and the inner peripheral wall 19 of the main burner 8, the bottom plate 21, the outer peripheral wall 18, the inner peripheral wall 19, and the main burner cover are formed. The space enclosed by 20 can be used as the main burner distribution chamber 22 of the main burner 8. At the same time, the outer peripheral wall 18 of the main burner 8 is covered by the main burner cover 20 to form a hole communicating with the main burner cover 22, as shown in Fig. 1, the outer periphery of the main burner 8. It can be divided into a plurality of flame holes 23. As shown in FIGS. 1 to 3, between the center burner 9 and the main burner 8, four connection portions 24 extending radially in a predetermined direction and extending in the horizontal direction are provided by the connection. In the portion 24, the central burner 9 is integrated with the main burner 8. Further, a gas supply passage 25 for a main burner to be described later is formed inside each of the connecting portions 24. Further, as shown in Figs. 1 and 2, protrusions 26 are formed on the upper portion of each of the joint portions 24. The inner end of each of the projections 26 abuts against the outer peripheral edge of the central burner cover 13, and the outer end abuts against the inner periphery of the main burner cover 20. Thereby, the central burner cover 13 and the main burner cover 2 can be positioned to prevent the respective positions from being displaced. As shown in Fig. 2, the throat portion 10 is formed in a cylindrical shape in which the axis is oriented in the vertical direction, the downstream end (upper end) of the throat portion 10 is opened upward toward the gas introduction chamber, and the upstream end (lower end) faces the nozzle 27 to be described later. front end. The throat 10 is held by the aforementioned bracket 3. The bracket 3 is constituted by a support post portion 4 which is fixedly attached to the base portion 28' of the chassis 7 and which is erected on one side of the base portion 28, and a retaining portion 3A which is supported by the support post portion 29 and is inserted and held by the throat portion 1. The base portion 28, the support post portion 29, and the holding portion 30 are integrally formed of a metal block such as an aluminum alloy. A gas passage 31 for fuel gas is formed inside the base portion 28 of the bracket 3, and a nozzle 27 communicating with the gas passage 31 is attached to the upper portion. The nozzle 27 sprays the fuel gas vertically upward. When the fuel gas is ejected from the nozzle 27 to the throat 1 , the fuel gas is taken up into the surrounding air as a primary air and enters the throat, and fuel gas is generated inside the throat portion of the 201217709 and the gas guiding chamber 16 and __ _ secondary air mixture. Further, a lower portion 32 of the partition wall (10) forming the upper portion of the gas introduction chamber 16 is formed with a bulging portion 32 which is swelled toward the downstream end of the throat portion ίο. The ridge portion is provided in a region corresponding to the opening of the downstream end of the throat 10, and a south-lower difference 33 is formed around the ridge portion. Here, the main burner gas supply passage 25 and the central burner gas supply passage 17 will be described in detail. As shown in Fig. 2, the main burner gas supply passage 25 is formed inside the connecting portion 24, and the bottom surface thereof is closed by a bottom plate integral with the throat. Further, the gas guiding chamber 16 and the domain brain distribution chamber 22 are communicated by the gas burner supply passage 25, and the mixed gas is supplied to the main burner distribution chamber 22. As shown in Fig. 3, the bottom plate 21 of the throat 1 () body is formed at the bottom of the main burner gas supply passage 25 at a position where the concave portion 34 is formed, so that the flow cross-sectional area of the mixed air is large. Further, the bottom plate 21 located at a position corresponding to the connecting portion 24 adjacent to each other is formed with a through hole 35 for allowing the secondary air for combustion of the center burner 9 to flow. On the other hand, as shown in Fig. 4, the burner head 2 is turned upside down, and a plurality of convex portions 36 are formed on the inner surface side of the main burner 8. As shown in Fig. 3, the projections 36 are engaged with the plurality of engaging holes 37 formed by the bottom plate 21. Further, as shown in Fig. 4, the inlet of the central burner gas supply passage 17 is provided between the main burner gas supply passages 25 adjacent to each other. As shown in Figs. 4 and 5, the inlet of the central burner gas supply passage 17 is provided outside the ridge portion 32. Therefore, the central burner air supply passage 17 is located outside the opening end of the throat portion 1 below the partition wall 11 toward the outer side of the 201217709 domain. Further, the 'central burner' is surrounded by a gas supply passage such as a side wall 38 formed on both sides of the inlet to surround the inlet. The side wall 38 is located between the center (4) of the gas supply and the horizontal side of the gas supply, and is located between the brain gas supply passages 彼此. According to the above configuration 'refer to Fig. 2, when the fuel gas is injected from the nozzle 27 toward the upstream end opening of the throat 1〇, the fuel gas will be entrained from the surrounding air as the secondary air-face into the throat 1 () A mixed gas of fuel gas and primary air is generated. The mixed gas enters the gas guide chamber 16 from the downstream end of the throat 1 () and collides with the partition wall u below. The mixed gas colliding with the partition wall π surface is separated from the upper edge of the throat 10 and the lower surface of the partition wall, and then spreads under the partition wall 11 to form a gas flow toward the main burner gas supply passage 25 and a gas supply toward the central burner. Airflow through passage 17. At this time, since the rising portion 32 is provided under the partition wall 11 in the field corresponding to the opening at the downstream end of the throat 10, the mixed gas is changed to be horizontally scattered along the ridge portion 32, and the portion is slightly raised. The height difference 33 of the Xiao is guided by the main burner supply passage 25 and the central gas supply passage 17 and flows smoothly. The mixed gas toward the main burner gas supply passage 25 is supplied to the respective flame holes 23 through the main burner gas supply unit 25 in the main recording unit (4). On the other hand, the machine supplies a gas supply passage 17 to the center circulator for the main burner gas supply passage other than the gas supply passage 25. As shown in Fig. 4, the population of the central burner gas supply passage 17 is provided between the main burner heater supply passages 25 adjacent to each other. Thereby, the airflow toward the central burner gas supply passage 17 and the airflow toward the main burner gas supply passage 25 can be respectively formed in 201217709. Therefore, the mixed gas flow toward the main burner gas supply passage 25 is hardly affected by the mixed gas flow toward the central burner gas supply passage 17, and the main burner 8 can be supplied with a sufficient amount of the mixed gas. Further, as shown in Fig. 5, the inlet of the gas supply passage 17 for the center burner is located outside the region opposite to the opening at the downstream end of the throat 10 below the partition wall 11, so that the mixed gas flows upward from the downstream end of the throat 10. The gas supply passage 17 for the central burner is not linearly changed without changing its flow direction, and excessive supply of the mixed gas to the central burner 9 can be prevented. Further, as shown in Fig. 5, the mixed gas toward the central burner gas supply passage 17 collides with the side wall 38, so that the flow direction is changed to surely flow into the inlet of the central burner gas supply passage 17. Thereby, even if the mixed gas flow rate is fast with a large fire power, a sufficient amount of the mixed gas enters the central burner distribution chamber 14 of the central burner 9 through the central burner gas supply passage 17 to be uniformly distributed. As shown in FIG. 4, the side wall 38 is formed on both sides, but the shape of the side wall 38 is not limited thereto. For example, a gas supply along the central burner may be formed. The passage 17 has a curved semicircular shape. In the present embodiment, the four main burner gas supply passages 25 are provided in the four connection portions 24, but the number of the connection portions 24 and the main burner gas supply passages 25 is not limited to four. However, in consideration of uniformly supplying the mixed gas to the main burner distribution chamber 22 from the gas introduction chamber 16, the number of the connection portions 24 12 201217709 and the main burner gas supply passage 25 is preferably plural. Further, in the present embodiment, the ridge portion 32 is provided on the lower surface of the partition wall, whereby the height difference 33 is provided on the outer circumference of the swell portion 32. However, as long as the mixed gas flow diffused from the gas introduction chamber 16 in the horizontal direction can be sufficiently obtained, The ridge portion 32 may not be provided. I: BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a gas burner according to an embodiment of the present invention. Fig. 2 is a cross-sectional explanatory view of the gas burner of the embodiment. Fig. 3 is a perspective view showing the main part of the gas burner of the embodiment. Fig. 4 is a perspective view showing the combustion head of the embodiment in an upside down manner. Fig. 5 is a cross-sectional explanatory view showing the positional relationship between the throat and the gas supply passage for the central combustion portion. [Main component symbol description 1... Gas burner 2.. Burning head 3.. Bracket 4.. Furnace body 5.. . Top plate 6.. Burner opening 7... Chassis 8.. Main Burner 9.. Central Burner 10.. Throat 1 11.. Separation Wall 12... Perimeter Wall 13.. Central Burner Cover 14.. Central Burner Distribution Room 15.. Flame hole 16: gas introduction chamber 17: gas supply passage for central burner 18. peripheral wall 19: inner peripheral wall 13 201217709 20... main burner cover 30... holding portion 21. The bottom plate 31...the gas passage 22...the main burner distribution chamber 32...the bulging portion 23...the flame hole 33...the height difference 24...the joint portion 34.·the recess portion 25...the main combustion Gas supply passage 35 for the device...through hole 26...protrusion 36...convex portion 27...nozzle 37...engagement hole 28...base portion 38...side wall 29...support column Department 14