1275735 玖、發明說明： 【明戶斤屬才支冬好々貝】 技術領域 本發明係有關於主要使用在瓦斯爐之母子式燃燒器。 5 C先前技術】 背景技術 過去，此種母子式燃燒器包含子燃燒器蓋及包圍子燃 燒器蓋之環狀的母燃燒器蓋，且在子燃燒器蓋之周壁部朝 圓周方向隔著間隔形成多數子燃燒器焰孔，並且在母燃燒 10器蓋之外周周壁部朝圓周方向隔著間隔形成多數母燃燒器 焰孔。而且，一般而言，該母子式燃燒器係利用點火器在 子燃燒器焰孔與母燃燒器焰孔之其中一焰孔點火，且將火 焰移到另' 焰孔。 因此，在母燃燒态盖之上壁部設有可進行母燃燒器焰 15孔與子燃燒為焰孔之間的火焰移動且朝直徑方向延伸之縫 隙焰孔(例如，參照專利文獻:！、幻。縫隙焰孔係藉由從母燃 燒為盍之外周切削而形成，以包括外周側之外周壁之方式 完全地切斷母燃燒器蓋之外周部分。 【專利文獻1】日本專利公開公報實開平第1 一 144614 20 號(說明書第4頁、第1圖） 【專利文獻2】日本專利公開公報特許第25〇6954號（第 2頁右欄、第2圖）1275735 玖 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术5 C Prior Art Background In the past, such a mother-child burner includes a sub-burner cover and an annular female burner cover surrounding the sub-burner cover, and is spaced apart in the circumferential direction at the peripheral wall portion of the sub-combustor cover A plurality of sub-combustor flame holes are formed, and a plurality of mother burner flame holes are formed at intervals in the circumferential direction around the mother combustion 10 cover. Moreover, in general, the mother-child burner uses an igniter to ignite one of the flame holes of the sub-combustor and the flame hole of the mother burner, and moves the flame to the other flame hole. Therefore, in the upper wall portion of the mother combustion state cover, there is provided a slit flame hole which can move the flame between the mother burner flame 15 and the sub-combustion as the flame hole and which extends in the diameter direction (for example, refer to Patent Document: !, The slit flame hole is formed by cutting from the mother to the outer circumference of the crucible, and completely cuts the outer peripheral portion of the mother burner cover so as to include the outer peripheral side outer peripheral wall. [Patent Document 1] Kaiping No. 1 144 614 20 (the fourth page of the specification, the first drawing) [Patent Document 2] Japanese Patent Laid-Open Publication No. 25-695 (page 2, right column, second figure)
【發明内容;J 發明之揭示 1275735 發明欲解決之問題 如上述習知例，若以完全地切斷母燃燒器蓋之外周部 分之方式來形成縫隙焰孔，則缝隙焰孔會因為母燃燒器苗 的熱膨脹而變得狹窄，且寬度會朝直徑方向外側變窄，並 5 且，從縫隙焰孔噴出的瓦斯量會減少，而無法順利地進行 母燃燒杰焰孔與子燃燒器焰孔之間的火焰移動。特別是當 母燃燒器蓋由熱膨脹率較載置該母燃燒器蓋之燃燒器頭更 大的材料形成，且由相對於燃燒器頭之内周側的嵌合部來 限制母燃燒器蓋之熱膨脹，並且，母燃燒器蓋整體無法均 1〇勻地熱膨脹時，縫隙焰孔會成為母燃燒器蓋之熱膨脹的收 納部，因此，縫隙焰孔容易變得狹窄，且使火焰移動性低 劣。 — 有鑑於上述問題點，本發明之目的在於提供可防止縫 隙焰孔因母燃燒器蓋的熱膨脹而變窄且可良好地維持火焰 15移動性之母子式燃燒器。 解決問題之手段 為了解決上述問題，本發明之母子式燃燒器係包含子 燃燒為盖及包圍子燃燒器蓋之環狀的母燃燒器蓋，且在子 20 ^燒^ ^之周壁部朝圓周方向隔著間隔形成多數子燃燒器 焰孔並且在母燃燒器蓋之外周周壁部朝圓周方向隔著間 隔形成多數母燃燒器焰孔，且在母燃燒器蓋之上壁部設置 朝直徑方向延伸，以進行母燃燒器焰孔與子燃燒器焰孔之 2的火I移動之縫隙焰孔，又，縫隙焰孔係形成為使可連 結缝隙焰孔之兩㈣的肉部殘留於母職器蓋之外周部 1275735 分。 根據上述構造，一旦因母燃燒器蓋之熱膨脹使縫隙焰 孔的寬度變窄之應力產生作用，則在經切除之肉部會產生 壓縮應力。並且，該壓縮應力會成為抵抗力而產生作用， 5 以抑制縫隙焰孔變窄，並良好地維持火焰移動性。 於此，為了使火焰移動性更為良好，縫隙焰孔宜形成 為通達母燃燒器蓋之外周緣，且縫隙焰孔宜與形成於外周 周壁部之母燃燒器焰孔接近。此時，若以通過母燃燒器蓋 之任一母燃燒器焰孔的形成位置形成縫隙焰孔，則無法僅 1〇切除與母燃燒器焰孔的上端之間的些許肉部，且因強度不 足而無法充分地抑制縫隙焰孔變窄。 相對於此’若縫隙焰孔形成為通過位於母燃燒器蓋之 外周周壁部的母燃燒器焰孔之間的任一隔壁部上部且通達 母燃燒器蓋之外周緣，則可殘留隔壁部作為肉部，以確保 肉部的強度，並有效地抑制縫隙焰孔變窄。 但’當如上所述地切除隔壁部，則相對於縫隙焰孔之 瓦斯流入範圍之直徑方向最外端的位置會成為隔壁部之内 周面的位置。於此，若欲增加可進入位於母燃燒器蓋之外 周緣之縫隙焰孔外端的瓦斯量並提高火焰移動性，則宜僅 2〇可能縮短相對於縫隙路孔之瓦斯流入範圍之錢方向最外 端的位置與母燃燒器蓋之外周緣之間的距離。此時，若在 =部之内周面形成通達縫隙焰孔且凹入直徑方向外側之 &口P貝J瓦斯會從窪部流入縫隙焰孔，因此，相對於縫隙 焰孔之瓦斯流入範圍之直捏方向最外端的位置會接近母燃 7 1275735 少凡為盖之外周、緣。結果，可增加進入縫隙焰孔外端的瓦斯 量，並提高火培移動性。 又’若在母燃燒器蓋之上壁部中形成縫隙焰孔的部分 下面形成朝上方凹入之窪部，則形成縫隙焰孔的部分之上 5壁部的厚度會變薄，因此，縫隙焰孔的通氣抵抗會減少， 且來自縫隙焰孔的喷出瓦斯量會增加，因而提高火焰移動 性。 【貧施方式】 實施發明之最佳形態 10 以下’參照圖式說明本發明之實施形態。第1圖係本發 明母子式燃燒器之第1實施形態的平面圖，第2圖係在第1圖 之Π—11線切斷之截面圖，第3圖係在第1圖之III 一 III線切斷 之母燃燒器蓋的展開截面圖，第4圖係在第1圖之IV—IV線 切斷之母燃燒器蓋的截面圖，第5圖係在第1圖之ν—ν線切 15斷之母燃燒器蓋的截面圖，第6圖係在第5圖之VI —VI線切 斷截面圖，第7圖係在第5圖之νιΙ — νΠ線切斷截面圖，第8 圖係第2實施形態之母燃燒器蓋的截面圖。 第1圖、第2圖所示之燃燒器為由子燃燒器1與包圍子燃 燒器1之母燃燒器2所構成之瓦斯爐用母子式燃燒器，且載 20 置固定於省略圖式之瓦斯爐本體内的台框3上。該母子式燃 燒器包含子燃燒器混合管4與母燃燒器混合管5。並且，使 各瓦斯喷嘴4a、5a面對各混合管4、5之上游端，且由各混 合管4、5產生從各瓦斯噴嘴4a、5a喷出的燃料瓦斯與隨著 燃料瓦斯的噴出所吸引之一次空氣的混合氣體。兩混合管 1275735 4、5在其下游部分形成為一體，且藉由鑄鐵鑄造成一體。 兩混合管4、5的一體化部分係形成為由子燃燒器混合管4之 下游部分且朝上方開口之内筒4b及母燃燒器混合管5之下 游部分且朝上方開口之外筒5b所構成之内外2層的筒狀。 5 又，母子式燃燒器包含後合於内筒4b上端之子燃燒器 頭6及包圍子燃燒器頭6之環狀的母燃燒器頭7。子燃燒器頭 6與母燃燒器頭7係嵌合於外筒5b，且透過可將來自母燃燒 器混合管5之混合氣體導入母燃燒器頭7之圓周方向3處的 通路部8形成為一體。而且，子燃燒器頭6與母燃燒器頭7藉 1〇 由鑄鐵鑄造成一體。 又，於子燃燒器頭6載置有黃銅製子燃燒器蓋9，且由 子燃燒器混合管4及子燃燒器頭6及子燃燒器蓋9構成子燃 燒器1。在子燃燒器蓋9之周壁部朝圓周方向隔著間隔形成 多數子燃燒器焰孔9a。並且，由子燃燒器混合管4供給的混 15 合氣體係透過子燃燒器頭6與子燃燒器蓋9之間所劃分的分 布室從子燃燒器焰孔9a噴出。 於母燃燒器頭7載置有包圍子燃燒器蓋9之環狀的母燃 燒器蓋10，且由母燃燒器混合管5及母燃燒器頭7及母燃燒 器蓋10構成母燃燒器2。母燃燒器蓋1〇為黃銅製，且具有安 2〇裝於母燃燒器頭7之外周的向上直立壁7a之外周周壁部，並 在該周壁部朝圓周方向隔著間隔形成多數母燃燒器焰孔 10a。並且，由母燃燒器混合管5供給的混合氣體係透過母 燃燒器頭7與母燃燒器蓋10之間所劃分的分布室從母燃燒 器焰孔l〇a喷出。 1275735 另，母燃燒器蓋10之外周周壁部係如第3圖所示，形成 為具有朝圓周方向隔著間隔且垂直設置之多數齒部的齒形 形狀，且在該等齒部間之間隙構成母燃燒器焰孔l〇a，並在 各齒部構成用以劃分母燃燒器焰孔l〇a之隔壁部l〇b。又， 5 在各隔壁部10b下端形成有成為保護焰孔之凹溝10c。又， 在母燃燒器蓋1〇之内周形成内嵌於母燃燒器頭7之内周的 向上直立壁7b之筒狀嵌合部l〇d，以將母燃燒器蓋1〇固定於 母燃燒器頭7。 在前述台框3安裝有面對母燃燒器蓋1〇之點火栓π及 10 面對子燃燒器蓋9之作為火焰檢測元件之熱電偶12。並且， 藉由點火栓11的火花放電在母燃燒器2點火，且將火焰從母 燃燒器2移至子燃燒器1，並由熱電偶檢測火焰朝子燃燒 器1移動的情形。 於此，在母燃燒器蓋10之上壁部l〇e設有在位於内周之 15 圓周方向上互相接近的一對火焰移動焰孔10f、10f及在兩火 焰移動焰孔l〇f、I0f之間朝直徑方向外側延伸之縫隙焰孔 iOg。並且，火焰從母燃燒器焰孔l〇a移至縫隙焰孔10g，且 從縫隙焰孔10g透過火焰移動焰孔10f移至子燃燒器焰孔 9a。另，如第4圖所示，火焰移動焰孔1〇f以火焰朝子燃燒 2〇 器蓋9延伸之狀態由朝直徑方向内侧傾斜所形成之圓孔構 成。 缝隙焰孔10g係如第5圖所示，形成為通過隔壁部10b 之上部且通達母燃燒器蓋10之外周緣。並且，切除隔壁部 1〇b以作為連結縫隙焰孔l〇g之兩側面的肉部。於此，若完 10 1275735 、刀畊隔羞。卩l〇b而形成縫隙焰孔1〇g，則縫隙焰孔會 因為母燃燒11蓋_麟脹㈣得狹窄且寬度會朝直徑方 向外側變窄，並且 來自縫隙焰孔10g的噴出瓦斯量會減 5 10 15 20 少，且火焰移動性會變差。特別是本實施形態中，由於母 燃燒器蓋1G為黃銅製且熱膨脹率較鑄鐵製母燃燒器頭6更 大，且，母燃燒器蓋10的熱膨脹會受限於相對於母燃燒器 頭6之内周的嵌合部·，因此，燒器蓋崎體無法均 ^也熱膨脹，結果，縫隙焰孔1Qg會變成母燃燒器蓋ι〇之熱 膨脹的收納部，且縫隙焰孔10g容易變窄。 另方面，如上所述，當切除隔壁部l〇b使因母燃燒器 襄10的熱知脹而縮小縫隙焰孔1〇g的寬度之應力產生作用 時，會在隔壁部1〇b產生壓縮應力，並且，該壓縮應力會成 為抵抗力，即，隔壁部10b會成為支持，而抑制縫隙焰孔1〇g 變狹窄，並良好地維持火焰移動性。 又，本貫施形態中，如第6圖所示，在縫隙焰孔1〇g所 通過之隔壁部10b的内周面以其上端通達縫隙焰孔1〇g之形 態形成有凹入直徑方向外側之窪部1〇h。藉此，縫隙焰孔1〇g 之瓦斯流入範圍（與分布室連通的範圍）之直徑方向最外端 的位置中僅窪部l〇h的部分接近母燃燒器蓋1〇的外周緣。結 果，進入位於母燃燒器蓋10之外周緣的縫隙焰孔1〇g外端的 混合瓦斯量會增加，因而提高火焰移動性。 再者，本實施形態中，如第7圖所示，在形成母燃燒器 蓋10之上壁部10e之縫隙焰孔i〇g的部分下面形成朝上方凹 入之窪部10i。藉此，由於形成縫隙焰孔l〇g的部分之上壁 11 1275735 部10e的厚度變薄，因此，縫隙焰孔i〇g的通氣抵抗會減少， 且來自縫隙焰孔l〇g之喷出混合氣體量會增加，因而提高火 培移動性。 於此，連接上述窪部10h、10i，且在鑄造母燃燒器蓋 5 10時成形。並且，在鑄造母燃燒器蓋10後，藉由第5圖中以 假想線所示之圓形切斷器C切削加工縫隙焰孔10g，但，因 為窪部10h、l〇i的存在，可減少切削費用，且使縫隙焰孔 l〇g的加工更為容易。 又，縫隙焰孔10g形成於遠離將來自母燃燒器混合管5 10 的混合氣體導入母燃燒器頭6之通路部8的圓周方向位置， 此係由於若縫隙焰孔10g靠近通路部8，則來自縫隙焰孔10g 的噴出混合氣體會過大，而發生抬高的情況。 但，亦可將縫隙焰孔1〇g之直徑方向外端的位置設定在 母燃燒器蓋10之外周緣的内側，但，如此一來，從縫隙焰 15孔10g噴出的混合氣體將不易通達母燃燒器焰孔10a的附 近，且火焰移動性會變差。因此，縫隙焰孔1〇g宜形成為可 通達母燃燒器蓋10之外周緣。此時，如第8圖所示之第2實 轭形悲，縫隙焰孔10g亦可形成為通過母燃燒器焰孔1〇a的 形成位置且通達母燃燒器蓋10之外周緣。然而，此時，僅 20可切除縫隙焰孔1〇g與母燃燒器焰孔10a上端之間的些許肉 部l〇j，且因為強度不足而無法充分地抑制缝隙焰孔1〇g變 乍。因此，如上述第1實施形態，宜切除隔壁部1〇b，使縫 隙焰孔i〇g形成為通過位於母燃燒器焰孔1〇a之間的任一隔 壁部10b上部且通達母燃燒器蓋10之外周緣。 12 1275735 另，在上述實施形態中，藉由點火栓n在母燃燒器2點 火，且將火焰從母燃燒器2移至子燃燒器i，但，在子燃燒 器1點火，且將火焰從子燃燒移至母燃燒器2亦同樣地適 用本發明。又，在上述實施形態中，使子燃燒器混合管4與 母燃燒器混合管5成為一體，同時使母燃燒器頭6與子燃燒 為頭7成為一體，但亦可個別地形成該等構件。 【圓式簡單說明】 第1圖係本發明母子式燃燒器之第1實施形態的平面 圖。 10 截面圖 第2圖係在第1圖之II 一 II線切斷之截面圖。 第3圖係在第1圖之in — III線切斷之母燃燒器蓋的展開 第4圖係在第1圖之IV— IV線切斷之母燃燒器蓋的截面 圖 15 圖 20 〇 第5圖係在第1圖之V — V線切斷之母燃燒器蓋的截面 〇 弟6圖係在第5圖之VI — VI線切斷截面圖。 第7圖係在第5圖之VII —VII線切斷截面圖。 第8圖係第2實施形態之母燃燒器蓋的截面圖。 圖式之主要元件代表符號表】 1·..子燃燒器 2.. .母燃燒器 3.. .台框 4.. .子燃燒器混合管 5·.·母燃燒器混合管 4a、5a···瓦斯喷嘴 4、5…混合管 4b·.·内筒 13 1275735 5b...外筒 6.. .子燃燒器頭 7.. .母燃燒器頭 7a、7b...向上直立壁 8.. .通路部 9.. .子燃燒器蓋 9a...子燃燒器焰孔 10…母燃燒器蓋 10a…母燃燒器焰孔 l〇b...隔壁部 10c···凹溝 10d...筒狀嵌合部 10e...上壁部 10f···火焰移動焰孔 l〇g···縫隙焰孔 10h、10i…窪部 11.. .點火栓 12.. .熱電偶 C···切斷器 14[Disclosure of the Invention] J. Disclosure of the Invention 1275735 Problem to be Solved by the Invention As in the above-described conventional example, if the slit flame hole is formed in such a manner that the outer peripheral portion of the mother burner cover is completely cut, the slit flame hole may be due to the mother burner The heat expansion of the seedling becomes narrow, and the width is narrowed toward the outer side in the diameter direction, and the amount of gas ejected from the slit flame hole is reduced, and the flame of the parent flame and the burner hole of the sub-burner cannot be smoothly performed. The flame moves between. In particular, when the mother burner cover is formed of a material having a higher coefficient of thermal expansion than the burner head on which the mother burner cover is placed, and the female burner cover is restricted by the fitting portion with respect to the inner peripheral side of the burner head When the thermal expansion of the mother burner cover is not uniform, the slit flame hole becomes a housing portion for thermal expansion of the mother burner cover. Therefore, the slit flame hole is likely to be narrow and the flame mobility is inferior. In view of the above problems, an object of the present invention is to provide a mother-and-child burner which can prevent a slit flame hole from being narrowed by thermal expansion of a mother burner cover and which can maintain the mobility of the flame 15 satisfactorily. Means for Solving the Problem In order to solve the above problems, the mother-child burner of the present invention comprises a ring-shaped mother burner cover that is sub-combusted into a cover and a sub-burner cover, and is circumferentially facing the circumference of the sub-boiler A plurality of sub-combustor flame holes are formed at intervals in the direction, and a plurality of mother burner flame holes are formed at intervals in the circumferential direction in the circumferential wall portion outside the mother burner cover, and the wall portion of the parent burner cover is provided to extend in the diameter direction. a slit flame hole for moving the flame of the mother burner and the flame of the sub-burner 2, and the slit flame hole is formed so that the meat portions of the two (four) which can be connected to the slit flame are left in the mother machine The outside of the cover is 1275735 points. According to the above configuration, once the stress which narrows the width of the slit flame hole due to the thermal expansion of the mother burner cover acts, compressive stress is generated in the cut meat portion. Further, the compressive stress acts as a resistance, 5 suppresses the narrowing of the slit flame, and maintains the flame mobility well. Here, in order to make the flame mobility more favorable, the slit flame hole is preferably formed to reach the outer periphery of the mother burner cover, and the slit flame hole is preferably close to the female burner flame hole formed in the outer peripheral wall portion. At this time, if the slit flame hole is formed at the formation position of the flame hole of any of the mother burners passing through the mother burner cover, it is impossible to cut only a small portion of the meat between the upper end of the flame hole of the mother burner, and the strength Insufficient to sufficiently suppress the narrowing of the slit flame hole. On the other hand, if the slit flame hole is formed so as to pass through the upper portion of the partition wall portion between the female burner flame holes of the peripheral wall portion of the outer burner cover and the outer edge of the mother burner cover, the partition wall portion can remain as The flesh is to ensure the strength of the flesh and effectively suppress the narrowing of the slits. However, when the partition wall portion is cut as described above, the position at the outermost end in the diameter direction of the gas inflow range of the slit flame hole becomes the position of the inner peripheral surface of the partition wall portion. Here, if it is desired to increase the amount of gas that can enter the outer end of the slit flame hole at the periphery of the parent burner cover and improve the flame mobility, it is preferable to shorten the gas direction of the gas inflow range with respect to the slit hole. The distance between the position of the outer end and the outer circumference of the parent burner cover. At this time, if the inner peripheral surface of the = portion is formed with a slit flame hole and the concave portion is recessed in the outer side in the radial direction, the mouth P gas flows into the slit flame hole from the crotch portion, and therefore, the gas inflow range with respect to the slit flame hole The position of the outermost end of the straight pinch direction will be close to the mother burning 7 1275735. As a result, the amount of gas entering the outer end of the slit flame hole can be increased, and the fire propagation property can be improved. Further, if a portion which is recessed upward is formed under the portion where the slit flame hole is formed in the wall portion of the mother burner cover, the thickness of the wall portion of the portion where the slit flame is formed becomes thin, and therefore, the slit The ventilation resistance of the flame holes is reduced, and the amount of gas discharged from the slit flame holes is increased, thereby improving flame mobility. [Poverty Mode] BEST MODE FOR CARRYING OUT THE INVENTION 10 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a plan view showing a first embodiment of the mother-child burner of the present invention, and Fig. 2 is a cross-sectional view taken along line Π-11 of Fig. 1, and Fig. 3 is a line III to III of Fig. 1. The expanded cross-sectional view of the burner cap of the cut-off, Figure 4 is a cross-sectional view of the burner cap cut off in line IV-IV of Figure 1, and Figure 5 is cut by the line ν-ν in Figure 1. Sectional view of the burner cover of the 15th cut, Fig. 6 is a cutaway sectional view taken along line VI-VI of Fig. 5, and Fig. 7 is a cutaway sectional view of the νιΙ-νΠ line of Fig. 5, Fig. 8 A cross-sectional view of a mother burner cover of the second embodiment. The burner shown in Fig. 1 and Fig. 2 is a gas burner mother-child burner composed of a sub-combustor 1 and a mother burner 2 surrounding the sub-combustor 1, and the load is fixed to the gas of the omitted pattern. On the frame 3 in the furnace body. The mother-child burner comprises a sub-combustor mixing tube 4 and a mother burner mixing tube 5. Further, each of the gas nozzles 4a, 5a faces the upstream ends of the respective mixing tubes 4, 5, and the fuel gas discharged from the respective gas nozzles 4a, 5a and the discharge chamber with the fuel gas are generated by the respective mixing tubes 4, 5. A mixture of air that attracts the primary air. The two mixing tubes 1275735 4, 5 are integrally formed in the downstream portion thereof and are integrally cast by cast iron. The integrated portion of the two mixing tubes 4, 5 is formed by the downstream portion of the sub-combustor mixing tube 4 and the inner cylinder 4b opening upward and the downstream portion of the mother burner mixing tube 5 and opening the outer cylinder 5b upward. Two layers of cylinders inside and outside. Further, the mother-child burner includes a sub-burner head 6 that is fitted to the upper end of the inner cylinder 4b and a ring-shaped female burner head 7 that surrounds the sub-combustor head 6. The sub-burner head 6 and the female burner head 7 are fitted to the outer cylinder 5b, and the passage portion 8 through which the mixed gas from the mother burner mixing pipe 5 is introduced into the circumferential direction 3 of the mother burner head 7 is formed as One. Further, the sub-burner head 6 is integrally molded from the cast iron head 1 by cast iron. Further, a brass burner cover 9 is placed on the sub-combustor head 6, and the sub-combustor 1 is constituted by the sub-combustor mixing pipe 4, the sub-combustor head 6, and the sub-combustor cover 9. A plurality of sub-combustor flame holes 9a are formed in the circumferential wall portion of the sub-burner cover 9 at intervals in the circumferential direction. Further, the mixed gas mixture system supplied from the sub-combustor mixing pipe 4 is discharged from the sub-combustor flame hole 9a through the distribution chamber divided between the sub-combustor head 6 and the sub-combustor cover 9. The mother burner head 7 is provided with an annular mother burner cover 10 surrounding the sub-burner cover 9, and the mother burner mixing tube 5 and the mother burner head 7 and the mother burner cover 10 constitute the mother burner 2 . The mother burner cover 1 is made of brass, and has a peripheral wall portion which is attached to the outer vertical wall 7a of the outer periphery of the female burner head 7, and a plurality of mother burners are formed at intervals in the circumferential direction of the peripheral wall portion. Flame hole 10a. Further, the mixed gas system supplied from the mother burner mixing pipe 5 is discharged from the mother burner flame hole l〇a through the distribution chamber divided between the mother burner head 7 and the mother burner cover 10. 1275735 In addition, as shown in FIG. 3, the outer peripheral wall portion of the mother burner cover 10 is formed in a tooth shape having a plurality of teeth portions which are vertically spaced apart in the circumferential direction, and a gap between the teeth portions. The mother burner flame hole l〇a is formed, and the partition portion l〇b for dividing the mother burner flame hole l〇a is formed in each tooth portion. Further, 5 a groove 10c for protecting the flame hole is formed at the lower end of each partition portion 10b. Further, a cylindrical fitting portion 10d embedded in the inner vertical wall 7b of the female burner head 7 is formed on the inner circumference of the mother burner cover 1 to fix the female burner cover 1 to the female Burner head 7. A thermocouple 12 as a flame detecting element facing the sub-burner cover 9 facing the ignition plugs π and 10 of the mother burner cover 1 is attached to the frame 3 . Further, the mother burner 2 is ignited by the spark discharge of the ignition plug 11, and the flame is moved from the mother burner 2 to the sub-burner 1, and the flame is detected by the thermocouple to move toward the sub-burner 1. Here, the upper wall portion l〇e of the mother burner cover 10 is provided with a pair of flame moving flame holes 10f, 10f which are adjacent to each other in the circumferential direction of the inner circumference 15, and the flame moving holes l〇f, A slit flame hole iOg extending outward in the diametrical direction between I0f. Further, the flame is moved from the mother burner flame hole l〇a to the slit flame hole 10g, and is moved from the slit flame hole 10g through the flame moving flame hole 10f to the sub-burner flame hole 9a. Further, as shown in Fig. 4, the flame moving flame hole 1〇f is constituted by a circular hole formed by inclining the inner side in the radial direction in a state in which the flame extends toward the sub-burning cover 9. As shown in Fig. 5, the slit flame hole 10g is formed to pass through the upper portion of the partition wall portion 10b and to reach the outer periphery of the mother burner cover 10. Further, the partition wall portion 1b is cut as a meat portion that connects both side faces of the slit flame hole 100g. Here, if 10 1275735 is finished, the slashing is shameful.卩l〇b and the slit flame hole 1〇g is formed, the slit flame hole is narrowed due to the mother burning 11 cover _ lining (four) and the width is narrowed outward in the diameter direction, and the amount of gas discharged from the slit flame hole 10g will be Less 5 10 15 20 less, and the flame mobility will be worse. In particular, in the present embodiment, since the mother burner cover 1G is made of brass and the coefficient of thermal expansion is larger than that of the caster burner head 6, the thermal expansion of the mother burner cover 10 is limited relative to the parent burner head 6. In the fitting portion of the inner circumference, the burner cover body is not thermally expanded, and as a result, the slit flame hole 1Qg becomes a housing portion for thermal expansion of the mother burner cover, and the slit flame hole 10g is easily narrowed. . On the other hand, as described above, when the partition wall portion 10b is caused to reduce the stress of the width of the slit flame hole 1〇g due to the thermal expansion of the mother burner 10, compression occurs in the partition portion 1〇b. In addition, the compressive stress becomes a resistance, that is, the partition wall portion 10b is supported, and the slit flame hole 1〇g is suppressed from becoming narrow, and the flame mobility is favorably maintained. Further, in the present embodiment, as shown in Fig. 6, the inner peripheral surface of the partition wall portion 10b through which the slit flame hole 1〇g passes has a concave diameter direction formed at the upper end thereof through the slit flame hole 1〇g. The outer side of the ankle is 1〇h. Thereby, in the position of the outermost end in the diameter direction of the gas inflow range (the range communicating with the distribution chamber) of the slit flame hole 1〇g, only the portion of the crotch portion l〇h is close to the outer peripheral edge of the mother burner cover 1〇. As a result, the amount of mixed gas entering the outer end of the slit flame hole 1〇g located at the outer periphery of the mother burner cover 10 is increased, thereby improving the flame mobility. Further, in the present embodiment, as shown in Fig. 7, the crotch portion 10i which is recessed upward is formed on the lower surface of the portion where the slit flame hole i〇g of the upper wall portion 10e of the mother burner cover 10 is formed. Thereby, since the thickness of the upper wall 11 1275735 portion 10e forming part of the slit flame hole l〇g is thinned, the ventilation resistance of the slit flame hole i〇g is reduced, and the ejection from the slit flame hole l〇g is reduced. The amount of mixed gas will increase, thereby increasing the mobility of the fire. Here, the above-described crotch portions 10h, 10i are joined and formed when the mother burner cover 5 10 is cast. Further, after the mother burner cover 10 is cast, the slit flame hole 10g is cut by the circular cutter C shown by the imaginary line in Fig. 5, but because of the presence of the crotch portions 10h, l〇i The cutting cost is reduced, and the processing of the slit flame hole l〇g is made easier. Further, the slit flame hole 10g is formed at a position away from the circumferential direction of the passage portion 8 for introducing the mixed gas from the mother burner mixing pipe 5 10 into the mother burner head 6, because if the slit flame hole 10g is close to the passage portion 8, The ejected mixed gas from the slit flame hole 10g is excessively large and is raised. However, the position of the outer end of the slit flame hole 1〇g in the diameter direction may be set to the inner side of the outer periphery of the mother burner cover 10, but in this case, the mixed gas ejected from the hole 10g of the slit flame 15 will not easily reach the mother. In the vicinity of the burner flame hole 10a, flame mobility is deteriorated. Therefore, the slit flame hole 1〇g is preferably formed to be accessible to the outer periphery of the mother burner cover 10. At this time, as in the second yoke shape shown in Fig. 8, the slit flame hole 10g may be formed to pass through the formation position of the mother burner flame hole 1〇a and reach the outer periphery of the mother burner cover 10. However, at this time, only 20 pieces of the meat portion l〇g between the slit flame hole 1〇g and the upper end of the mother burner flame hole 10a can be cut, and the slit flame hole 1〇g cannot be sufficiently suppressed due to insufficient strength. . Therefore, as in the first embodiment, the partition wall portion 1b is preferably cut, and the slit flame hole i〇g is formed so as to pass through the upper portion of the partition wall portion 10b between the mother burner flame holes 1a and reach the mother burner. The outer periphery of the cover 10. 12 1275735 In addition, in the above embodiment, the ignition bolt n is ignited at the mother burner 2, and the flame is moved from the mother burner 2 to the sub-combustor i, but the sub-combustor 1 is ignited and the flame is removed from The invention is equally applicable to the sub-combustion to the parent burner 2. Further, in the above embodiment, the sub-combustor mixing pipe 4 and the mother burner mixing pipe 5 are integrated, and the mother burner head 6 and the sub-combustion are integrated into the head 7, but these members may be formed separately. . [Description of Round Type] Fig. 1 is a plan view showing a first embodiment of the mother-child burner of the present invention. 10 Sectional view Figure 2 is a cross-sectional view taken along line II and II of Figure 1. Figure 3 is a cross-sectional view of the mother burner cover cut off in line IV-IV of Fig. 1 in the unfolding of the burner cap of the in-III line in Fig. 1 Fig. 15 Fig. 5 is a cross-sectional view of the cross section of the burner cover of the V-V line cut off in Fig. 1 taken on line VI-VI of Fig. 5. Fig. 7 is a cross-sectional view taken along line VII-VII of Fig. 5. Fig. 8 is a cross-sectional view showing the mother burner cover of the second embodiment. The main components of the diagram represent the symbol table] 1·.. sub-burner 2... mother burner 3.. . frame 4:. sub-combustor mixing tube 5·.·mother burner mixing tube 4a, 5a ···Gas nozzles 4, 5... Mixing tubes 4b···Inner cylinders 13 1275735 5b...Outer cylinders 6... Sub-burner heads 7... Mother burner heads 7a, 7b... Upright wall 8.. Access section 9.. sub-burner cover 9a... sub-burner flame hole 10... mother burner cover 10a... mother burner flame hole l〇b... partition wall 10c···groove 10d...tubular fitting portion 10e...upper wall portion 10f···flame moving flame hole l〇g···slot flame hole 10h, 10i...洼11.. Ignition plug 12.. Even C···cutter 14