1275736 九、發明說明： 【日月冷貝】 技術領域 本發明係有關於包含環狀之母燃燒器及配置於母燃燒 5器内側之子燃燒器的瓦斯爐用母子式燃燒器。 疋 L先前技術2 背景技術 過去，一般而言，此種母子式燃燒器係由在外周部形 成有朝外側開口之多數焰孔的外焰式燃燒器構成母燃燒器 10與子燃燒為。在此，為了提高熱效率，宜儘可能增長燃燒 排氣流出至火架上之調理容器的底面外側前的接觸時間二 但，若母燃燒器由外焰式燃燒器構成，則母燃燒器的火焰 會碰到調理容器底面偏外侧的部分，因此，燃燒排氣盘調 理容器的接觸時間會變短，而不易提高熱效率。 15 ®此，過去有人利用在内周部形成有朝内側開口之多 數焰孔的内焰式燃燒器之母燃燒器作為母燃燒器（例如，參 照專利文獻1)。然而，該裝置係由外焰式燃燒器構成子辦 燒器，為了防止從母燃燒器之焰孔延伸至内側的火焰盘從 子燃燒器之焰孔延伸至外側的火焰互相干擾，必須敍母 20燃燒器的1^役。因此，會有母子式燃齡變大的不良情況。 【專利文獻1】日本專利賴公報特開平22〇715 號 t發明内容3 發明之揭示 1275736 發明欲解決之問題 有鑑於以上的問題點，本發明之目的在於提供由内焰 式燃燒器構成母燃燒器以提高熱效率且達成小型化之瓦斯 爐用母子式燃燒器。 5 為了達成上述目的，本發明之瓦斯爐用母子式燃燒器 包含環狀之母燃燒器及配置於母燃燒器内側之子燃燒器， 且母燃燒器係由在内周部形成有朝内側開口之多數焰孔的 内焰式燃燒器構成，又，子燃燒器係由在上端部形成有朝 上側開口之多數焰孔的上焰式燃燒器構成，同時，母燃燒 1〇器之焰孔朝直徑方向内側向圓周方向之其中一方向傾斜。 根據上述構造，由於子燃燒器的火焰在母燃燒器之内 侧中央部朝上方延伸，因此，相較於利用可形成朝母燃燒 器向外延伸的火焰之外焰式子燃燒器之習知母子式燃燒 器，母燃燒器與子燃燒器的火焰不易互相干擾。再者，藉 15由母燃燒器的焰孔朝圓周方向傾斜，可對母燃燒器的火焰 施加朝圓周方向之旋轉運動成分，以抑制火焰朝内側延 伸。因此，即使縮小母燃燒器的内徑，也不會發生母燃燒 器與子燃燒器的火焰互相干擾的情況，並可實現燃燒器的 小型化。 。 20 另，母燃燒器之焰孔朝圓周方向的傾斜角愈大，火焰 則愈不易朝内侧延伸，但，從加工上的限制來看，在增: 傾斜角上也有所限制。於此，當母燃燒器之焰孔在上；方 向為長形缝隙狀時，若焰孔朝上且朝前述圓周方向之其中 -方向傾斜’則如第4圖所示，來自焰孔上端之瓦斯嘴’出轴 1275736 線A2相對於來自焰孔下端之瓦斯喷出軸線A1會朝直徑方 向外側偏移，而可有效地抑制火焰朝内側延伸。再者，由 於較縫隙狀焰孔更薄且朝上下方向蔓延的火焰會位於外 側，因此，與來自上方的二次空氣之接觸面積會增加，燃 5 燒性也更良好。 又，若母燃燒器之焰孔朝直徑方向内側向上傾斜，則 可更加抑制母燃燒器的火焰朝内側延伸，並進—步達成小 型化。此時，若母燃燒器的焰孔所形成開口之内周的焰孔 開口面形成為朝上方擴徑之錐面，則可確保母燃燒器的火 10焰在上侧的外面與焰孔開口面之間朝上方蔓延的空間，且 二次空氣可順利地從上方供給至焰孔的附近部分。因此， 可避免火焰為了得到二次空氣而朝外侧蔓延，並提高熱效 率。 15 也可抑制母燃 又’若設定子燃燒器的配置高度，使子燃燒器之上端 部與母燃燒ϋ之焰孔下端等高或較低，财更有效地防止 母燃燒器與子燃燒器的火焰互相干擾，又 燒器的火焰使子燃燒器過熱。 圖式簡單說明 20 第1圖係具有與本發明相 的例子之截斷侧視圖。 關之母子式燃燒器之瓦斯爐 第2圖係母子式燃燒器的平面圖。 第3圖係母子式燃燒器的透視圖。 1275736 L實施方式j 實施發明之最佳形態 參照第1圖，1為瓦斯爐本體，在瓦斯爐本體1設有包含 環狀之母燃燒器3及配置於母燃燒器3内側之子燃燒器4之 5母子式燃燒器2，且將母子式燃燒器2放入設於用以覆蓋瓦 斯爐本體1上面之頂板5的燃燒器用開口 5a。在頂板5上載置 用以覆蓋燃燒器用開口 5a之開口邊緣部的覆蓋爐圈6,並載 置由在覆蓋爐圈6外側安裝於頂板5之圓形棒狀材料製之環 狀火架框7a及固定於火架框7a之多數火架爪7b所構成之火 10 架7。 母子式燃燒器2之母燃燒器3由在内周部形成有朝内側 開口之多數焰孔31的内焰式燃燒器所構成，而子燃燒器4由 在上端部形成有朝上侧開口之多數焰孔41的上焰式燃燒器 所構成。亦可參照第2圖、第3圖詳細說明。 15 母燃燒器3由與混合管部32形成為一體之環狀的燃燒 器支架33及載置於燃燒器支架33上之環狀的燃燒器頭34戶^ 構成。燃燒器頭34具有内周壁部341、外周壁部342及用以 閉塞内外兩周壁部341、342間之上端且朝外側延伸之上壁 部343。在母燃燒器3之内周部之燃燒器頭34之内周壁部 20 341，在圓周方向隔著間隔形成多數朝内側開口且朝上下方 向之長形縫隙狀焰孔31。另’為了避免二次空氣不足引（ 燃燒不良’焰孔31每隔2個則形成小的焰孔μ，。 各焰孔31係如第4圖所示，朝母燃燒器3之直徑方向内 側朝圓周方向之其中一方向（第4圖的順時針方向）以預定扩 1275736 角α傾斜。因此’朝圓周方向之旋轉運動成分會施加於來 自焰孔31时出瓦斯_燒職生社焰，而抑制火焰朝 内側延伸。即，火焰 朝 +易延伸至與來自焰孔31之瓦斯噴出 軸線相切且與母燃燒器3之環狀中心同心的圓（以下，稱作 5瓦斯喷出軸線的内接圓）的内側。此時，宜設定焰孔Μ的旋 角α ’使《㈣軸線之内接圓的直徑較子燃燒器4大。 又各孔31係如第5圖所示，朝上方朝前述圓周方向 之其中一方向（順時針方向）傾斜。藉此，來自焰孔31上端之 瓦斯喷出祕A2相對於來自斜L31下端之瓦斯喷出轴線 10 A1會朝直徑方向外側偏移，且上端之瓦斯喷出軸線A2的内 接圓S2之直徑較下端之瓦斯喷出轴線乂的内接_大， 故，可更有效地抑制火焰朝内側延伸。再者，由於較縫隙 狀的焰孔31更薄且朝上下方向蔓延的火焰會位於外側，因 此，與來自上方的二次空氣之接觸面積會增加，燃燒性也 15 更良好。 又’由於各焰孔31朝直徑方向内側向上傾斜，因此， 亦可抑制火焰朝内侧延伸。再者，焰孔31所形成開口之焰 孔開口面344(内周壁部341之内周面）形成為朝上方擴徑之 。藉此’可確保焰孔31的火焰F1在上側的外面與焰孔BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner mother-child burner including a ring-shaped mother burner and a sub-combustor disposed inside the mother burner. BACKGROUND OF THE INVENTION In the past, in general, such a mother-child burner is composed of an outer-extinguish burner having a plurality of flame holes opened to the outside in the outer peripheral portion, and the female burner 10 and the sub-combustion are formed. Here, in order to improve the thermal efficiency, it is preferable to increase the contact time before the combustion exhaust gas flows out to the outside of the bottom surface of the conditioning container on the fire frame. However, if the mother burner is composed of an outer flame type burner, the flame of the mother burner The portion of the bottom side of the conditioning container is encountered, so that the contact time of the combustion exhaust tray conditioning container becomes shorter, and the thermal efficiency is not easily improved. In the past, a mother burner of an internal flame type burner having a plurality of flame holes opened toward the inside was formed as a mother burner in the past (for example, refer to Patent Document 1). However, the device is composed of an external flame burner, and in order to prevent the flame from extending from the flame hole of the mother burner to the inner side from the flame hole of the sub-combustor to the outside, the flame must be interfered with. 20 burners. Therefore, there is a problem that the mother-child type is getting older. [Patent Document 1] Japanese Patent Laid-Open Laid-Open Patent Publication No. Hei 22 No. 715. SUMMARY OF THE INVENTION 3 DISCLOSURE OF THE INVENTION 1275736 DISCLOSURE OF THE INVENTION In view of the above problems, an object of the present invention is to provide a mother combustion composed of an internal flame type burner In order to improve the thermal efficiency and achieve miniaturization of the mother and child burners for gas furnaces. In order to achieve the above object, the mother-and-burner for a gas burner of the present invention comprises a ring-shaped mother burner and a sub-burner disposed inside the mother burner, and the mother burner is formed to open to the inside from the inner peripheral portion. An internal flame burner of a plurality of flame holes is formed. Further, the sub-burner is composed of an upper flame type burner in which a plurality of flame holes opening toward the upper side are formed at the upper end portion, and at the same time, the flame hole of the mother burner is directed toward the diameter. The inner side of the direction is inclined in one of the circumferential directions. According to the above configuration, since the flame of the sub-burner extends upward in the central portion of the inner side of the mother burner, the conventional mother and child of the flame type burner are used as compared with the flame which can form the flame extending outward toward the mother burner. The burners, the flames of the mother burner and the sub-burner do not easily interfere with each other. Further, by the fact that the flame hole of the mother burner is inclined in the circumferential direction, a rotational movement component in the circumferential direction can be applied to the flame of the mother burner to suppress the flame from extending inward. Therefore, even if the inner diameter of the mother burner is reduced, the flames of the mother burner and the sub-combustor do not interfere with each other, and the size of the burner can be reduced. . 20 In addition, the larger the inclination angle of the flame hole of the mother burner in the circumferential direction, the less the flame is more likely to extend toward the inner side. However, from the viewpoint of processing limitation, there is also a limitation in the increase: the inclination angle. Here, when the flame hole of the mother burner is on; when the direction is a long slit shape, if the flame hole is upward and inclined toward the middle direction of the circumferential direction, as shown in FIG. 4, from the upper end of the flame hole The gas nozzle 'outlet shaft 1275736 line A2 is outwardly displaced in the diametrical direction with respect to the gas discharge axis A1 from the lower end of the flame hole, and can effectively suppress the flame from extending inward. Further, since the flame which is thinner than the slit-shaped flame hole and spreads in the vertical direction is located on the outer side, the contact area with the secondary air from the upper side is increased, and the burning property is also better. Further, if the flame hole of the mother burner is inclined upward toward the inner side in the diameter direction, the flame of the mother burner can be further suppressed from extending inward, and the size can be further reduced. At this time, if the flame opening opening surface on the inner circumference of the opening formed by the flame hole of the mother burner is formed as a tapered surface which is expanded upward, the outer surface of the flame of the mother burner and the opening of the flame hole can be ensured. A space that spreads upward between the faces, and the secondary air can be smoothly supplied from the upper portion to the vicinity of the flame hole. Therefore, it is possible to prevent the flame from spreading to the outside in order to obtain secondary air, and to improve the heat efficiency. 15 can also suppress the mother burning and 'if the height of the sub-burner is set, so that the upper end of the sub-combustor is equal to or lower than the lower end of the flame hole of the mother burning crucible, and the female burner and the sub-burner are more effectively prevented. The flames interfere with each other, and the flame of the burner heats the sub-burner. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cut-away side view of an example in accordance with the present invention. Gas stove for the mother and child burners of Fig. 2 Fig. 2 is a plan view of the mother and child burner. Figure 3 is a perspective view of the mother and child burner. 1275736 L Embodiment j Best mode for carrying out the invention Referring to Fig. 1, 1 is a gas furnace main body, and a gas burner main body 1 is provided with a ring-shaped mother burner 3 and a sub-combustor 4 disposed inside the mother burner 3. The mother-child burner 2 is placed, and the mother-child burner 2 is placed in the burner opening 5a provided in the top plate 5 for covering the upper surface of the gas furnace body 1. A covered hoop 6 for covering the opening edge portion of the burner opening 5a is placed on the top plate 5, and an annular flame frame 7a made of a circular rod-like material attached to the top plate 5 outside the covered hob 6 is placed. And a fire 10 frame 7 formed by a plurality of firearm claws 7b fixed to the fire frame 7a. The mother burner 3 of the mother-child burner 2 is constituted by an inner-flame burner in which a plurality of flame holes 31 opening toward the inner side are formed in the inner peripheral portion, and the sub-combustor 4 is formed with an upward opening at the upper end portion. The upper flame burner of the plurality of flame holes 41 is constituted. It can also be explained in detail with reference to FIGS. 2 and 3. The mother burner 3 is composed of an annular burner holder 33 integrally formed with the mixing tube portion 32 and an annular burner head 34 mounted on the burner holder 33. The burner head 34 has an inner peripheral wall portion 341, an outer peripheral wall portion 342, and an upper end portion 343 which is formed to close the upper end between the inner and outer peripheral wall portions 341 and 342 and to the outside. In the inner peripheral wall portion 20 341 of the burner head 34 at the inner peripheral portion of the mother burner 3, a plurality of long slit-shaped flame holes 31 which are opened toward the inner side and face upward and downward are formed at intervals in the circumferential direction. In addition, in order to avoid the shortage of secondary air (the combustion is poor, the flame holes 31 form a small flame hole μ every two places. The respective flame holes 31 are as shown in Fig. 4, and are directed toward the inner side in the diameter direction of the mother burner 3. One of the directions in the circumferential direction (clockwise direction of FIG. 4) is inclined at a predetermined angle of 1275736. Therefore, the component of the rotational motion in the circumferential direction is applied to the gas from the flame hole 31. The flame is prevented from extending toward the inside. That is, the flame is easily extended to + to a circle tangential to the gas discharge axis from the flame hole 31 and concentric with the annular center of the mother burner 3 (hereinafter, referred to as a 5 gas discharge axis) The inner side of the inscribed circle. At this time, it is preferable to set the rotation angle α ' of the flame hole 使 so that the diameter of the inner circle of the (four) axis is larger than that of the sub-combustor 4. Further, each hole 31 is as shown in Fig. 5 The upper side is inclined in one of the circumferential directions (clockwise direction), whereby the gas discharge secret A2 from the upper end of the flame hole 31 is diametrically outwardly deviated with respect to the gas discharge axis 10 A1 from the lower end of the oblique L31. Shifted, and the upper end of the gas discharge axis A2 inscribed circle S2 The diameter of the lower end of the gas discharge axis 乂 is larger, so that the flame can be more effectively suppressed from extending toward the inner side. Further, since the slit-like flame hole 31 is thinner and the flame that spreads in the up and down direction is located On the outer side, the contact area with the secondary air from above increases, and the flammability is also better. Further, since each of the flame holes 31 is inclined upward toward the inner side in the diameter direction, the flame can be prevented from extending inward. The flame hole opening surface 344 (the inner circumferential surface of the inner circumferential wall portion 341) of the opening formed by the flame hole 31 is formed to expand upward. Thereby, the flame F1 of the flame hole 31 can be ensured on the outer surface and the flame hole of the upper side.
2〇 開Q 面344之間朝上方蔓延的空間，且二次空氣可順利地從 上方供給至焰孔31的附近部分。因此，可抑制火焰F1為了 知到二次空氣而朝外侧蔓延。結果，可避免碰到火架7上之 "周理容器P底面之火焰的位置朝外側偏移，並可提高熱效 率。 - 1275736 燃燒器頭34之上壁部343的外徑較覆蓋爐圈6的内徑大 一點。並且，使上壁部343上面從形成於其内周之環狀的凸 條345朝外側向下傾斜，如此一來，掉落至上壁部343之溢 出來的湯汁可朝覆蓋爐圈6流下。 5 子燃燒器4由具有混合管部42之環狀的燃燒器支架43 及載置於燃燒器支架43上之環狀的燃燒器頭44所構成。燃 燒頭44具有内周壁部441、外周壁部442及用以覆蓋内外 兩周壁部44卜442上端之間的上壁部443。並且，在子燃燒 器4之上端部之燃燒器頭44之上壁部443以放射狀形成多數 10朝上侧開口且朝直徑方向之長形縫隙狀焰孔41。 如此一來，由於子燃燒器4由具有朝上的焰孔41之上焰 式燃燒器構成，因此，子燃燒器4的火焰F2會在母燃燒器3 之内側中央部朝上方延伸，且與如上所述抑制母燃燒器3的 火焰F1朝内側延伸相輔相成，即使母燃燒器3的内徑較小， 15也不會發生母燃燒器3與子燃燒器4的火焰FI、F2互相干擾 的情形。因此，可達成母子式燃燒器2的小型化。 又’子燃燒器4配置成燃燒器頭44之上壁部443與母燃 燒1§3之焰孔31下端等高。若上壁部443位於母燃燒器3之焰 孔31下端的上方，則在上壁部443附近，母燃燒器3的火焰 2〇 F1會朝子燃燒器4的火焰F2中直徑較大的部分延伸，因此， 在避免火焰FI、F2互相干擾上相當不利，再者，也容易發 生母燃燒器3的火焰F1使燃燒器頭44過熱的情況。另一方 面’若上壁部443之配置高度與母燃燒器3之焰孔31下端等 咼，則在子燃燒器4的火焰F2窄到某種程度的部分，母燃燒 1275736 器3的火焰F1會最接近，因此，對避免火焰FI、F2的互相干 擾有利，又，也可抑制燃燒器頭44過熱。另，上壁部443亦 可位於母燃燒器3之焰孔31下端的下方，但，為了提高熱效 率，宜縮短焰孔41與調理容器P之間的上下方向距離，因 5 此，如本實施形態，在上壁部443與母燃燒器3之焰孔31下 端等高之狀態下配置子燃燒器4是最理想的。 在燃燒器頭44之外周壁部442之圓周方向的一部分形 成有與點火電極45相對之點火用焰孔444及與作為火焰檢 測元件之熱電偶46相對之火焰檢測用焰孔445。再者，在燃 1〇 燒器頭44中，在點火用焰孔444的正上方設有朝外側突出且 用以對應溢出來的湯汁之簷部446，且藉由形成於詹部446 下面的靶447與點火電極45之間的火花放電，利用來自點火 用焰孔444的喷出瓦斯點火。並且，利用從點火用焰孔444 的火焰移動過來之火焰檢測用焰孔445的火焰將火焰送至 1S子燃燒器4之焰孔41與母燃燒器3之焰孔31。 另，上述實施形態中，分別由燃燒器支架33、43與燃 燒器頭34、44兩構件構成母燃燒器3與子燃燒器4，但，亦 可使燃燒器支架與燃燒器頭一體化。又，上述實施形態中， 母燃燒器3與子燃燒器4之燃燒器支架33、43為鑄物製，但， 20 亦可使用板金製之燃燒器支架。 【圖式簡單說明】 第1圖係具有與本發明相關之母子式燃燒器之瓦斯爐 的例子之截斷侧視圖。 第2圖係母子式燃燒器的平面圖。 ^75736 弟3圖係母子式燃燒器的透視圖。 第4圖係母燃燒器之燃燒器頭的部分截斷平面圖 第5圖係在第4圖之V_V線截斷的展開截面圖。 【阖式之主要元件代表符號表】 上·· •瓦斯爐本體 2·· •母子式燃燒器 3·· •母燃燒器 4" •子燃燒器 5·· -頂板 5a. ••燃燒器用開口 6.. •覆蓋爐圈 7.. .火架 7a. • •火架框 7b. • •火架爪 31 、41…焰孔 3Γ 焰孔 32 、42...混合管部 33 、43...燃燒器支架 34 、44...燃燒器頭 45…點火電極 46...熱電偶 341、 441···内周壁部 342、 442···外周壁部 343、 443···上壁部 344···焰孔開口面 444···點火用焰孔 445···火焰檢測用焰孔 446···簷部 447···靶2〇 The space which spreads upward between the Q faces 344 is opened, and the secondary air can be smoothly supplied from the upper side to the vicinity of the flame holes 31. Therefore, it is possible to suppress the flame F1 from spreading to the outside in order to know the secondary air. As a result, it is possible to avoid the position of the flame on the bottom surface of the container P on the fire frame 7 being shifted outward, and the heat efficiency can be improved. - 1275736 The outer diameter of the upper wall portion 343 of the burner head 34 is slightly larger than the inner diameter of the covered furnace ring 6. Further, the upper surface of the upper wall portion 343 is inclined downward toward the outer side from the annular rib 345 formed on the inner circumference thereof, so that the overflow of the soup falling to the upper wall portion 343 can flow down the covered hearth 6. The sub-combustor 4 is composed of a ring-shaped burner holder 43 having a mixing tube portion 42 and an annular burner head 44 placed on the burner holder 43. The burner 44 has an inner peripheral wall portion 441, an outer peripheral wall portion 442, and an upper wall portion 443 for covering between the upper ends of the inner and outer peripheral wall portions 44a. Further, the upper wall portion 443 of the burner head 44 at the upper end portion of the sub-combustor 4 radially forms a plurality of slit-shaped flame holes 41 which are open toward the upper side and which are elongated in the radial direction. In this way, since the sub-combustor 4 is composed of a flame burner having an upwardly facing flame hole 41, the flame F2 of the sub-combustor 4 extends upward at the inner central portion of the mother burner 3, and As described above, the flame F1 of the mother burner 3 is inhibited from extending toward the inner side, and even if the inner diameter of the mother burner 3 is small, the flames FI and F2 of the mother burner 3 and the sub-combustor 4 do not interfere with each other. . Therefore, the miniaturization of the mother-child burner 2 can be achieved. Further, the sub-combustor 4 is disposed such that the upper wall portion 443 of the burner head 44 is equal to the lower end of the flame hole 31 of the mother burning 1 § 3. If the upper wall portion 443 is located above the lower end of the flame hole 31 of the mother burner 3, in the vicinity of the upper wall portion 443, the flame 2〇F1 of the mother burner 3 extends toward the larger diameter portion of the flame F2 of the sub-burner 4. Therefore, it is disadvantageous to prevent the flames FI and F2 from interfering with each other, and further, the flame F1 of the mother burner 3 is likely to cause the burner head 44 to overheat. On the other hand, if the height of the upper wall portion 443 is equal to the lower end of the flame hole 31 of the mother burner 3, the flame F2 of the sub-combustor 4 is narrowed to a certain extent, and the flame F1 of the burner 1237536 is burned. It will be the closest, and therefore, it is advantageous to avoid mutual interference of the flames FI and F2, and it is also possible to suppress the burner head 44 from overheating. In addition, the upper wall portion 443 may be located below the lower end of the flame hole 31 of the mother burner 3, but in order to improve the thermal efficiency, it is preferable to shorten the distance between the flame hole 41 and the conditioning container P in the vertical direction, because the present embodiment In the embodiment, it is preferable that the sub-burner 4 is disposed in a state where the upper wall portion 443 is equal to the lower end of the flame hole 31 of the mother burner 3. A portion of the peripheral wall portion 442 outside the burner head 44 in the circumferential direction forms an ignition hole 444 opposed to the ignition electrode 45 and a flame detecting flame hole 445 opposed to the thermocouple 46 as a flame detecting element. Further, in the first burner head 44, a dam portion 446 which protrudes outward and which corresponds to the overflow is provided directly above the ignition flame hole 444, and is formed under the Zhanbe 446. The spark discharge between the target 447 and the ignition electrode 45 is ignited by the gas ejected from the ignition flame 444. Then, the flame is sent to the flame hole 41 of the 1S sub-combustor 4 and the flame hole 31 of the mother burner 3 by the flame of the flame detecting flame hole 445 which is moved from the flame of the ignition flame hole 444. Further, in the above embodiment, the burner holders 33 and the burner burners 34 and 44 constitute the mother burner 3 and the sub-burner 4, respectively, but the burner holder and the burner head may be integrated. Further, in the above embodiment, the burner holders 33 and 43 of the mother burner 3 and the sub-burner 4 are made of a cast material, but a burner holder made of sheet metal may be used. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cut-away side view showing an example of a gas burner having a mother-and-child burner according to the present invention. Figure 2 is a plan view of a mother-child burner. ^75736 Brother 3 is a perspective view of the mother and child burner. Fig. 4 is a partially cutaway plan view of the burner head of the mother burner. Fig. 5 is a developed sectional view taken along the line V_V of Fig. 4. [The main component symbol table of the 阖 type] ··· Gas furnace body 2·· • Mother-child burner 3·· • Mother burner 4" • Child burner 5·· - Top plate 5a. • Burner opening 6. Cover the furnace ring 7.. Fire frame 7a. • • Fire frame 7b. • • Fire frame claws 31, 41... Flame holes 3Γ Flame holes 32, 42... Mixing pipe parts 33, 43.. Burner brackets 34, 44... burner head 45...Ignition electrode 46...thermocouple 341, 441··· inner peripheral wall portion 342, 442···outer peripheral wall portion 343, 443··· upper wall portion 344···flame hole opening surface 444···Ignition flame hole 445···Flame detection flame hole 446···檐部447···Target
Al、A2…瓦斯噴出軸線 SI、S2…内接圓 FI、F2···火培 P···調理容器 12Al, A2... Gas ejection axis SI, S2... Inscribed circle FI, F2···Fire training P··· conditioning container 12