^ 1275744 九、發明說明： 【發明所屬之技術領域】 技術領域 本發明係有關於-種具有瓦斯燃燒器之瓦斯爐，更詳 5而言之，係有關於-種瓦斯燃燒器之燃燒器本體於覆蓋爐 具本體之上面之頂板上露出之瓦斯爐。 L先前技術3 背景技術 以往已知的是-種具有瓦斯燃燒器之瓦斯爐，該瓦斯 10燃燒器包含有：混合管，係其下游端部面對開設於頂板上 之燃燒器用開口者；及燃燒器本體，係直捏大於燃燒器用 開口且於頂板上露出者，又，突設於燃燒器本體之下面中 央部之流入用筒部與混合管之下游端部嵌合，以自混合管 將混合氣供給至燃燒器本體。 15 20 冑此種瓦斯爐構成為嵌人系統廚房之檯面之嵌入 式爐具時，會有無法自爐具本體之周圍充分地將空氣供給 ^爐具本體内之問題n往已知者亦包含有於頂板上 透過燃燒器本體之下面與頂板間之_將燃燒用一 人二乳導人爐具本體狀通氣杳卩者(例如參照專利文獻 :種瓦斯爐係於面對燃燒器本體下面之頂板之—部分形成 孔’且藉由透孔來構成通氣部。又，將通氣部形成為可 :過燃燒器本體之下面與頂板間之間隙將燃燒用-次空氣 入爐具本體内者制以防止煮溢湯汁通過通氣部而掉落 至爐具本體内。 5 1275744 不過，前述燃燒器本體係藉由混合管而透過流入用筒 部來支持，然而，為了使燃燒器本體容易裝卸，因此無法 使流入用筒部緊密地與混合管之下游端部嵌合，且燃燒器 本體變得容易傾斜，此時考慮於燃燒器本體之下面突設與 5 頂板抵接之突起以阻止燃燒器本體之傾斜，然而，如此一 來，相對於混合管構成嵌合面之流入用筒部之外周面的機 械加工會受到突起阻礙而變得費事，且於鑄造燃燒器本體 時，若突起直接為鑄件表面，則由於無法作出突起之高度 精度，因此亦必須進行突起之機械加工且生產性變差。 10 〔專利文獻1〕曰本專利公開公報特開2003-148735號 公報(0024段，第10圖） 【發明内容3 發明之揭示 發明所欲解決之課題 15 有鑑於前述問題，本發明之目的係提供一種可透過燃 燒器本體之下面與頂板間之間隙將燃燒用一次空氣供給至 爐具本體内，同時不會損害生產性且亦可防止燃燒器本體 之傾斜之瓦斯爐。 解決課題之手段 20 為了達成前述目的，本發明係一種瓦斯爐，該瓦斯爐 係具有瓦斯燃燒器者，又，前述瓦斯燃燒器包含有：混合 管，係其下游端部面對開設於覆蓋爐具本體之上面之頂板 上之燃燒器用開口者；及燃燒器本體，係直徑大於前述燃 燒器用開口且於前述頂板上露出者，又，突設於前述燃燒 1275744 器本體之下面中央部之流入用筒部與前述混合管之下游端 部嵌合，以自前述混合管將混合氣供給至前述燃燒器本 體，又，於前述頂板上形成可透過前述燃燒器本體之下面 與前述頂板間之間隙將燃燒用一次空氣導入前述爐具本體 5 内之通氣部，其特徵在於：於前述頂板之前述燃燒器用開 口之口緣部上，隔著圓周方向之間隔設置有複數個突起 部，而前述突起部抵接前述燃燒器本體之下面以限制前述 燃燒器本體之傾斜且朝上方突起，又，前述通氣部係由前 述突起部間之間隔所構成。 10 若藉由本發明，則可利用設置於頂板之燃燒器用開口 之口緣部上的突起部限制燃燒器本體之傾斜，因此，無需 於燃燒器本體之下面突設防止傾斜用之突起，且可輕易地 進行燃燒器本體之流入用筒部之外周面的機械加工而不會 受到突起阻礙，再者，亦不需要於將突起突設在燃燒器本 15 體之下面時所必須之鑄造後之突起機械加工，同時可提昇 生產性。又，由於可自燃燒器本體之下面與頂板間之間隙 透過藉由突起部間之間隔所構成之通氣部將燃燒用一次空 氣供給至爐具本體内，因此，即使於嵌入式瓦斯爐等中無 法自爐具本體之周圍充分地將空氣供給至爐具本體内，亦 20 不會產生因一次空氣不足所造成之燃燒不良。 不過，藉由具有配合燃燒器本體之配置部而開設且直 徑大於燃燒器本體之開口部的頂板本體及安裝於該開口部 之承湯盤來構成頂板，且於承湯盤上開設燃燒器用開口 時，為了防止煮溢湯汁自燃燒器用開口掉落至爐具本體 1275744 内，宜於燃燒器用開口之口緣部形成朝上 形(burring)部。又，若使各突起部自該凸 之凸出成 上方-體地伸出，則可避免因突 心端朝 提高且較騎利。 4所造成之成本^ 1275744 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a gas burner having a gas burner, and more specifically, to a burner body of a gas burner. A gas furnace exposed on the top plate covering the upper surface of the stove body. L. Prior Art 3 BACKGROUND OF THE INVENTION Conventionally known is a gas burner having a gas burner comprising: a mixing tube having a downstream end facing an opener for a burner opened on a top plate; The burner body is directly pinched to be larger than the opening for the burner and exposed on the top plate, and the inflowing tube portion protruding from the central portion of the lower portion of the burner body is fitted to the downstream end of the mixing tube to be self-mixing tube The mixed gas is supplied to the burner body. 15 20 胄When such a gas stove is constructed as a built-in stove for the countertop of the kitchen of the embedded system, there is a problem that it is impossible to supply the air sufficiently from the periphery of the stove body to the inside of the stove body. The top plate passes through the bottom of the burner body and the top plate. The body is ventilated with one person and two breasts. (For example, refer to the patent document: a gas furnace is attached to the top plate facing the burner body. The portion is formed into a hole and the vent portion is formed by the through hole. Further, the vent portion is formed such that the space between the lower surface of the burner body and the top plate is used to inject the combustion-secondary air into the furnace body. The boiled soup is prevented from falling through the vent to the inside of the stove body. 5 1275744 However, the burner system is supported by the inflow tube by the mixing tube, however, in order to facilitate the loading and unloading of the burner body, It is impossible to fit the inflowing tubing portion closely to the downstream end portion of the mixing tube, and the burner body is easily inclined. At this time, it is considered that the lower surface of the burner body protrudes from the protrusion abutting the top plate to prevent combustion. However, in this case, the machining of the outer peripheral surface of the inflowing tubular portion with respect to the mixing surface of the mixing tube is hindered by the projection, which becomes troublesome, and when the burner body is cast, if the projection is directly In the case of the surface of the casting, the height of the projection cannot be made, and therefore, the machining of the projections must be performed and the productivity is deteriorated. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2003-148735 (paragraph 0024, 10]) SUMMARY OF THE INVENTION Problem to be Solved by the Invention In view of the foregoing, it is an object of the present invention to provide a primary air for combustion to be supplied to a stove through a gap between a lower surface of a burner body and a top plate. In the present invention, a gas furnace which does not impair the productivity and can prevent the inclination of the burner body. The means for solving the problem 20 In order to achieve the above object, the present invention is a gas furnace having a gas burner, and The gas burner comprises: a mixing tube, wherein the downstream end faces the top plate which is disposed on the upper surface of the covering furnace body a burner opener; and a burner body having a diameter larger than the opening for the burner and exposed on the top plate, and protruding from the inflow cylinder portion and the downstream of the mixing tube at a central portion of the lower surface of the combustion body 1275744 The end portion is fitted to supply the mixed gas from the mixing tube to the burner body, and the top plate is formed on the top plate to penetrate the gap between the lower surface of the burner body and the top plate to introduce primary air for combustion into the stove. The venting portion in the main body 5 is characterized in that a plurality of protrusions are provided on the edge portion of the burner opening of the top plate at intervals in the circumferential direction, and the protrusion portion abuts against the lower surface of the burner body The ventilating portion is formed by the interval between the projections to restrict the inclination of the burner body and to protrude upward. According to the present invention, the inclination of the burner body can be restricted by the protrusion provided on the edge portion of the burner opening of the top plate, so that it is not necessary to protrude the protrusion for preventing the inclination from the lower surface of the burner body, and The machining of the outer peripheral surface of the inflowing cylinder portion of the burner body is easily performed without being hindered by the projections, and further, it is not necessary to cast the projections when they are protruded below the burner body 15 The protrusions are machined while improving productivity. Further, since the primary air for combustion can be supplied to the inside of the furnace body through the vent portion formed by the gap between the projections from the lower surface of the burner body and the top plate, even in an embedded gas furnace or the like. It is impossible to supply air sufficiently to the inside of the stove body from the periphery of the stove body, and 20 does not cause poor combustion due to insufficient primary air. However, the top plate is formed by a top plate body having a diameter larger than the opening of the burner body and a soup plate attached to the opening, and the burner opening is opened on the soup plate. At this time, in order to prevent the boiled soup from falling from the burner opening into the stove body 1275744, it is preferable to form a burring portion at the edge portion of the opening for the burner. Further, if the projections are projected to protrude upward from the projection, the projections can be prevented from being raised and more profitable. 4 costs
C實施方式；J 發明之較佳實施形態 10 第1圖係顯示配置為嵌入系統廚房之接面之嵌入式瓦 斯爐。該瓦斯爐包含有：爐具本則；覆蓋爐具本體i之上 面之頂板2;及左右2個瓦斯燃燒器3、3。又，於頂板^之上 面前側配置有2個瓦斯燃燒器3、3用之2個操作紐4、4之= 於頂板2上更載置有對應於2個瓦斯燃燒器3、3之2個火架 C . C ^ 如第2圖所示，各瓦斯燃燒器3包含有：固定於爐具本 體1内之混合管30;及於頂板2上露出之燃燒器本體31。又， 15頂板2包含有：頂板本體21，係具有配合燃燒器本體31之配 置部而開設且直徑大於燃燒器本體31之開口部211，同時藉 由玻璃製或金屬製厚板所構成者；及承湯盤22，係安裝於 該開口部211者，又，於承湯盤22之中央部開設有燃燒器用 開口 221。又，承湯盤22係於在頂板本體21之開口部211之 20 口緣上所安裝之襯墊212上載置於外周緣部。 混合管30之下游端部係朝上方彎曲且面對燃燒器用開 口 221。混合管30之上游端係面對省略圖式之瓦斯喷嘴，且 藉由燃料氣自瓦斯噴嘴噴出之喷射效果，燃燒用一次空氣 會吸引至混合管30，且於混合管3〇内混合燃料氣與一次空 、1275744 氣並生成混合氣。 燃燒器本體31包含有：基體部32，係直徑大於燃燒器 用開口221且呈空心圓盤狀者；支柱部33，係複數隔著圓周 方向之間隔立設於基體部32之上面且呈空心者；及頭部 5 34，係透過這些支桎部33支持於基體部32之上側且呈空心 環狀者。於基體部32之下面中央部垂設有與混合管3〇之下 游端部嵌合之流入用筒部32a，且於該流入用筒部32a中， •燃燒器本體31係與混合管3〇之下游端部嵌合為可自由裝 卸。又，來自混合管30之混合氣係透過基體部32之内部空 10間與支柱部33之内部空間供給至頭部34之内部空間。 頭部34包含有：下半部，係與基體部32及支柱部33一 體成形者；及上半部，係藉由載置於下半部且可自由裝卸 之燃燒器盍34a所構成者。於燃燒器蓋34a之下面，位於外 周部與内周部分別垂設有多數之齒34b，依此，於頭部34上 可設置藉由燃燒器蓋34a外周部之各歯糾間之間隙所構成 的外部焰孔35 ;及藉由燃燒器蓋34a内周部之各齒34b間之 間隙所構成的内部焰孔36。又，供給至頭部34之内部空間 之混合氣係自外部焰孔35與内部焰孔36噴出並燃燒。自外 部焰孔35噴出之混合氣之燃燒部分係自燃燒器本體η之外 2〇側供給燃燒用二次空氣，又，自内部焰孔％喷出之混合氣 之燃燒部分係透過藉由基體部32與頭部34間之各支柱部^ 間之空隙所構成的空氣通路37自燃燒器本體^之外側供給 燃燒用二次空氣。 ^ ° 又’參照第1及2圖，於瓦斯燃燒器3之周圍一側部設置 9 *1275744 有點火電極38與熱電偶39。點火電極38與熱電偶39係安裳 於托架30b上，且通過承湯盤22上所形成之各透孔222、 223(參照第3圖）於承湯盤22上突出，又，托架3〇b係固定於 混合管30下游端側之外側面上所形成之伸出部3〇a。又，於 5承湯盤22上，位於與托架3013對應之部分形成朝上方凹陷且 相對於托架30b之起伏部224。 又，如第3圖所示，於承湯盤22之燃燒器用開口221之 口緣部上，於圓周方向間隔地形成複數個朝上方突起之突 起部225。又，為了防止掉落至承湯盤22之煮溢湯汁自燃燒 10器用開口221掉落至爐具本體1内，於燃燒器用開口221之口 緣部形成朝上方彎曲之凸出成形部226，又，前述各突起部 225係自凸出成形部226之上端朝上方一體地伸出，藉此， 可與凸出成形部226之加壓成形同時地形成突起部225，且 可避免因設置突起部225所造成之加工成本之增加。 15 各突起部225之上端係隔著微細間隙面對燃燒器本體 31之下面，即，基體部32之下面。在此，燃燒器本體3“系 精由此合官30而透過流入用同部32a來支持’然而，為了使 燃燒器本體31容易裝卸，因此無法使流入用筒部32a緊密地 與混合管30之下游端部嵌合，且燃燒器本體31變得容易傾 20 斜，然而，於本實施形態中，當燃燒器本體31要傾斜時， 基體部32之下面會抵接於突起部225並限制燃燒器本體31 之傾斜，且可安定地支持燃燒器本體31。 依此，由於可藉由設置於承湯盤22之突起部225來限制 燃燒器本體31之傾斜，因此，無需於燃燒器本體31(基體部 1275744 32)之下面突設防止傾斜用之突起，故可輕易地進行燃燒器 本體31之流入用筒部32a之外周面的機械加工而不會受到 突起阻礙，再者，亦不需要於將突起突設在燃燒器本體之 下面時所必須之鑄造後之突起機械加工，同時可提昇生產 5 性0 又，亦可於承湯盤22上將突起部225設置為常時抵接於 基體部32之下面，然而，如此一來，藉由混合管3〇之下游 部與犬起部225間之上下方向之位置公差，在流入用筒部 32a完全地與混合管3〇之下游端部嵌合前突起部225會抵接 10於基體部32之下面，且會有無法再使流入用筒部32a與混合 管30之下游端部喪合之虞，因此，如本實施形態，宜將突 起部225形成為於基體部32之下面與突起部225之上端間空 出微細間隙。 又’於嵌入式瓦斯爐中，無法自爐具本體1之周圍充分 15地將空氣供給至爐具本體1内，如此一來，燃燒用一次空氣 會不足並產生燃燒不良。在此，於本實施形態中，如前所 述’由於突起部225係隔著圓周方向之間隔來設置，因此， 各突起部225、225間之間隔會構成連通基體部32之下面與 承湯盤22間之間隙及爐具本體1内之通氣部227，因此，燃 20燒用一次空氣可自基體部32之下面與承湯盤22間之間隙透 過該通氣部227供給至爐具本體丨内，且不會產生因一次空 氣不足所造成之燃燒不良。 以上說明具有藉由頂板本體21及承湯盤22所構成之頂 板2之瓦斯爐，然而，於使用省略承湯盤22且將頂板本體2 1275744 之開口部211作成更小直徑以使該開口部構成燃燒器用開 口之-肢構造之頂板的瓦斯射，衬同樣地應用本發 明，此時，亦可於安裝在燃燒器用開口之口緣部上之概塾 上-體地形成前述突起部。又，前述實施形態係於瓦斯燃 5燒器3之燃燒器本體31上設置外部焰孔35與内部焰孔36，然 而並不限於此，舉例言之，亦可使用具有僅設置外部焰孔 之空心圓盤狀燃燒器本體之瓦斯燃燒器。又，前述實施形 態係將本發明應用在嵌入式瓦斯爐中，然而，即使是桌上 型瓦斯爐，於爐具本體之密閉性高且無法自爐具本體之周 10圍充分地將空氣供給至爐具本體内時亦同樣地可應用本發 明。 【圖式簡單説明3 第1圖係顯示本發明實施形態之瓦斯爐之立體圖。 第2圖係第1圖之瓦斯爐之主要部分截面側視圖。 【主要元件符號説明】 15 第3圖係第1圖之瓦斯爐之承湯盤之立體圖。 1...爐具本體 30a···伸出部 2…頂板 30b.··托架 3...瓦斯燃燒器 31…燃燒器本體 4...操作鈕 32···基體部 5...火架 32a···流入用筒部 21...頂板本體 33...支柱部 22...承湯盤 34…頭部 30...混合管 34a…燃燒器蓋 12 1275744 34b···齒 212...襯墊 35…外部焰孔 221…燃燒器用開口 36...内部焰孔 222，223…透孔 37...空氣通路 224...起伏部 38...點火電極 225...突起部 39...熱電偶 226…凸出成形部 211...開口部 227...通氣部 13C Embodiments; Preferred Embodiments of the Invention of the Invention 10 Fig. 1 shows an embedded gas furnace configured to be embedded in the junction of the system kitchen. The gas burner comprises: a furnace main; a top plate 2 covering the upper surface of the main body i; and two gas burners 3 and 3 on the left and right sides. Further, two operation burners 4 and 4 for the two gas burners 3 and 3 are disposed on the front side of the top plate ^, and two of the two gas burners 3 and 3 are placed on the top plate 2. Fire frame C. C ^ As shown in Fig. 2, each gas burner 3 includes a mixing pipe 30 fixed in the furnace body 1 and a burner body 31 exposed on the top plate 2. Further, the top plate 2 includes a top plate body 21 having an opening portion 211 which is formed to fit the arrangement portion of the burner body 31 and has a diameter larger than that of the burner body 31, and is formed by a glass or metal plate; The soup tray 22 is attached to the opening 211, and a burner opening 221 is opened in the central portion of the soup tray 22. Further, the soup tray 22 is placed on the outer peripheral edge portion of the liner 212 attached to the edge of the opening 211 of the top plate body 21. The downstream end of the mixing tube 30 is bent upward and faces the burner opening 221 . The upstream end of the mixing tube 30 faces the gas nozzle of the omitted pattern, and by the spraying effect of the fuel gas ejected from the gas nozzle, the primary air for combustion is attracted to the mixing tube 30, and the fuel gas is mixed in the mixing tube 3〇. With a single empty, 1275744 gas and a mixture of gas. The burner body 31 includes a base portion 32 having a diameter larger than the burner opening 221 and having a hollow disk shape, and a pillar portion 33 which is erected on the upper surface of the base portion 32 at intervals in the circumferential direction and is hollow. And the head portion 5 34 is supported by the support portion 33 on the upper side of the base portion 32 and has a hollow ring shape. An inflow tubular portion 32a that is fitted to the downstream end portion of the mixing tube 3 is placed at a central portion of the lower surface of the base portion 32, and in the inflow tubular portion 32a, the burner body 31 and the mixing tube 3 are disposed. The downstream end portion is fitted to be detachable. Further, the mixed gas from the mixing pipe 30 is supplied to the internal space of the head portion 34 through the internal space of the base portion 32 and the internal space of the column portion 33. The head portion 34 includes a lower half portion which is integrally formed with the base portion 32 and the pillar portion 33, and an upper portion which is formed by a burner 盍 34a which is detachably mounted on the lower half. A plurality of teeth 34b are respectively disposed on the outer peripheral portion and the inner peripheral portion of the burner cover 34a. Accordingly, a gap between the outer peripheral portions of the burner cover 34a can be provided on the head portion 34. The outer flame hole 35 is formed; and the inner flame hole 36 formed by the gap between the teeth 34b of the inner peripheral portion of the burner cover 34a. Further, the mixed gas supplied to the internal space of the head portion 34 is ejected from the outer flame holes 35 and the inner flame holes 36 and burned. The combustion portion of the mixture discharged from the outer flame hole 35 is supplied with secondary air for combustion from the outer side of the burner body η, and the combustion portion of the mixture discharged from the inner flame hole is transmitted through the substrate. The air passage 37 formed by the gap between the pillar portions 32 between the portion 32 and the head portion 34 supplies the secondary air for combustion from the outside of the burner body. ^ ° Further, with reference to Figures 1 and 2, 9 * 1275744 is provided on the side of the gas burner 3 with the ignition electrode 38 and the thermocouple 39. The ignition electrode 38 and the thermocouple 39 are mounted on the bracket 30b, and protrude through the through holes 222 and 223 (refer to FIG. 3) formed on the soup plate 22 on the tray 22, and the bracket 3〇b is a projection 3〇a formed on the outer side of the downstream end side of the mixing tube 30. Further, on the 5th soup plate 22, a portion corresponding to the bracket 3013 is formed with a undulation portion 224 which is recessed upward and is opposed to the bracket 30b. Further, as shown in Fig. 3, a plurality of projecting portions 225 projecting upward are formed at intervals in the circumferential direction on the edge portion of the burner opening 221 of the soup plate 22. Further, in order to prevent the boiled soup which has fallen to the soup plate 22 from falling into the upper body 1 of the burner 10, a convex forming portion 226 which is curved upward is formed at the edge portion of the opening 221 for the burner. Further, each of the protrusions 225 integrally protrudes upward from the upper end of the protrusion molding portion 226, whereby the protrusion portion 225 can be formed simultaneously with the press molding of the protrusion molding portion 226, and the setting can be avoided. The processing cost caused by the protrusions 225 is increased. 15 The upper end of each of the projections 225 faces the lower surface of the burner body 31, that is, the lower surface of the base portion 32, with a fine gap therebetween. Here, the burner main body 3 is "supported by the integrator 30 and is supported by the inflow same portion 32a." However, in order to facilitate the attachment and detachment of the burner body 31, the inflow cylinder portion 32a cannot be closely fitted to the mixing tube 30. The downstream end portion is fitted, and the burner body 31 is easily inclined 20 degrees. However, in the present embodiment, when the burner body 31 is to be inclined, the lower surface of the base portion 32 abuts against the protrusion 225 and restricts The burner body 31 is inclined and can stably support the burner body 31. Accordingly, since the inclination of the burner body 31 can be restricted by the protrusion 225 provided on the soup plate 22, the burner body is not required. 31 (the base portion 1275744 32) protrudes from the lower surface to prevent the protrusion for tilting, so that the peripheral surface of the inflowing tubular portion 32a of the burner body 31 can be easily machined without being hindered by the protrusion, and further, It is necessary to machine the protrusions after casting which are necessary for the protrusions to protrude under the burner body, and at the same time, it is possible to increase the production performance, and the protrusions 225 can also be placed on the soup tray 22 to be constantly abutted. Base portion 32 Next, in this case, by the positional tolerance between the downstream portion of the mixing tube 3 and the dog-up portion 225, the inflow cylinder portion 32a is completely fitted to the downstream end portion of the mixing tube 3's. Since the protruding portion 225 abuts on the lower surface of the base portion 32, the inflowing tubular portion 32a and the downstream end portion of the mixing tube 30 can no longer be comminuted. Therefore, in the present embodiment, the protruding portion 225 is preferable. A fine gap is formed between the lower surface of the base portion 32 and the upper end of the protrusion portion 225. Further, in the embedded gas furnace, air cannot be supplied to the furnace body 1 sufficiently from the periphery of the furnace body 1 As a result, the primary air for combustion is insufficient and the combustion is insufficient. In the present embodiment, as described above, the projections 225 are provided at intervals in the circumferential direction. Therefore, the projections 225, The interval between the 225 portions constitutes a gap between the lower surface of the base portion 32 and the soup plate 22 and the vent portion 227 in the oven body 1. Therefore, the primary air for burning the fuel can be from the lower surface of the base portion 32 to the soup plate. 22 gaps are supplied through the vent 227 It is not inside the furnace body, and there is no burning failure caused by the lack of primary air. The gas furnace with the top plate 2 composed of the top plate body 21 and the soup plate 22 is described above. However, the use of the soup is omitted. The disk 22 and the opening portion 211 of the top plate body 2 1275744 are formed to have a smaller diameter so that the opening portion constitutes the gas of the top plate of the limb structure of the burner opening, and the lining is similarly applied to the present invention. The protrusion is formed on the edge portion of the opening of the burner, and the protrusion is formed on the burner body 31 of the gas burner 5, and the external flame hole 35 and the inner flame hole 36 are provided. However, it is not limited thereto, and for example, a gas burner having a hollow disk-shaped burner body in which only an external flame hole is provided may be used. Further, in the above embodiment, the present invention is applied to an embedded gas furnace. However, even in a table type gas furnace, the airtightness of the furnace body is high and the air cannot be sufficiently supplied from the circumference 10 of the furnace body. The invention is equally applicable to the interior of the oven body. 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 side view showing the main part of the gas furnace of Fig. 1. [Explanation of main component symbols] 15 Fig. 3 is a perspective view of the soup pan of the gas stove of Fig. 1. 1...furnace body 30a··extension 2...top plate 30b.·bay 3...gas burner 31...burner body 4...operation button 32···base unit 5.. Fire frame 32a···Inflow pipe portion 21...Top plate body 33...Pole portion 22...Tows plate 34...Head 30...Mixed pipe 34a...Burner cover 12 1275744 34b·· • tooth 212...pad 35...outer flame hole 221...burner opening 36...internal flame hole 222,223...through hole 37...air passage 224...undulation 38...ignition electrode 225 ...protrusion 39...thermocouple 226...protrusion forming portion 211...opening portion 227...venting portion 13