200406562 玖、發明說明： 【潑^明所屬控：術^領域^ 發明所屬之技術領域 本發明係有關一種於爐具本體設有面對開設於頂板之 5爐具開口之瓦斯燃燒器，同時藉由送風機將瓦斯燃燒器之 燃燒用二次空氣強制供氣的瓦斯爐。 L ^tr 習知技術200406562 发明 Description of the invention: [Po ^ Ming control: Field ^ Field ^ The technical field to which the invention belongs The invention relates to a gas burner provided on the stove body with 5 stove openings facing the top plate, and simultaneously borrowing A gas furnace for forcedly supplying secondary air for combustion of a gas burner by a blower. L ^ tr know-how
瓦斯爐為了提昇熱效率，最好能降低火架以縮短調理 10容器與瓦斯燃燒器間之距離，然而，於該狀態下，由於燃 燒排氣之排出阻力增加而有燃燒不良之情形。 故’以在0又置送風機而猎由送風機強制地將燃燒用二 次空氣供給至來自瓦斯燃燒器焰孔之瓦斯噴出部是已知的 (參照日本專利公開公報特公平7 — 96928號公報、實開平6 15 一4501號公報）°In order to improve the thermal efficiency of the gas furnace, it is better to lower the fire stand to shorten the distance between the conditioning container and the gas burner. However, in this state, there may be a problem of poor combustion due to the increase of the exhaust resistance of the combustion exhaust gas. Therefore, it is known that the blower is forced to supply the secondary air for combustion to the gas ejection unit from the flame hole of the gas burner by setting the blower at 0 (see Japanese Patent Laid-Open Publication No. 7-96928, Shi Kaihei 6 15-4501) °
又，以往使用使焰孔朝周方向傾斜而使火焰產生渦流 之所謂渦漩流燃燒器之瓦斯爐亦是已知的（參照特開平9一 79523號公報）° 發明所欲解決之課題 20 然而，若縮短5周理谷裔與瓦斯燃燒裔間之距離，則在 從焰孔喷出之瓦斯之燃燒反應結束前火焰就會觸及調理容 器而冷卻且燃燒狀態變差。在前述渦漩流燃燒器中，由於 火焰產生渦流，因此到達調理容器之時間加長’然而，若 僅使焰孔朝周方向傾斜’則無法避免火焰之牽引而沒有生 5 成充分之渦流且無法改善燃燒性。 有鑑於此，本發明之課題係提供一種即使縮短調理容 器與瓦斯燃燒器間之距離亦可維持良好之燃燒狀態之瓦斯 爐。 【明内溶1】 解決課題之手段 為了解決前述課題，本發明係提供一種瓦斯爐，係於 爐具本體設置面對爐具開口之瓦斯燃燒器，同時藉由送風 機將前述瓦斯燃燒器之燃燒用二次空氣強制供氣，且前述 爐具開口開設於頂板者，其特徵在於：前述燃燒用二次空 氣係朝來自於前述瓦斯燃燒器焰孔之瓦斯噴出部吹出且呈 具有前述爐具開口周方向之渦漩運動分量之漩渦狀。 若藉由前述構造，則可藉由燃燒用二次空氣所具有之 渦漩運動能量而於火焰有效地產生渦流。故，即使縮短調 理谷裔與瓦斯燃燒器間之距離亦可充分確保火焰到達調理 容器之時間，且在火焰到達鋼底前結束燃燒反應而維持 好之燃燒狀態。 又 在此，若设置與爐具開口呈同心環狀之供氣通路，且 射、乳通路具有來自送風機之空氣之紅部與開口朝瓦斯 喷出部之空氣之吹出部，並且使空氣於具有供氣通路切線 2之運動分量狀許從前述流人部流人該供氣通路，則 玉乱路㈣旋並從吹出部吹出且呈具有前述渴旋 運動分。又，亦可於吹出部或其附近設置施加 尚、文運動77里於空氣且朝周方向傾斜之丨崎導件，此時， 200406562 未必要使空氣在具有切線方向之運動分量狀熊 通路。 下流入供氣 5 10 又，若瓦斯燃燒器配置於頂板下方且由形、 燃燒器頭朝内之焰孔之内焰式燃燒器所構 夕數於 傅战，而該拗燒哭 頭與爐具開口呈同心之環狀，則即使為高卡之燃焊哭7 可縮小爐具開口之口徑且頂板之外型良好。 "°时亦 ^ 此盼，藉由使 燃燒用二次空氣至少於燃燒器頭之上方位置朝來自於焰孔 之瓦斯喷出部吹出且呈具有爐具開口周方向之渴旋運動分 量之旋渦狀，則可有效地使火焰產生渦流。又，為了依此 吹出燃燒用二次空氣，可採用下述方法中之至少一者，即· 設置從外側包圍燃燒器頭之環狀供氣通路，且該供氣通路 具有來自送風機之空氣之流入部與至少於燃燒器頭之上方In addition, a gas furnace using a so-called vortex burner in which a flame hole is inclined in a circumferential direction to vortex a flame is also known in the past (see Japanese Patent Application Laid-Open No. 9-79523). However, if the problem to be solved by the invention is 20, By shortening the distance between the Valley and the Gas Burners for 5 weeks, the flame will reach the conditioning container and cool down before the combustion reaction of the Gas ejected from the flame hole ends. In the aforementioned vortex burner, because the flame generates a vortex, the time to reach the conditioning container is prolonged. However, if the flame hole is only inclined in the circumferential direction, the traction of the flame cannot be avoided without generating a sufficient vortex and improving the combustion. Sex. In view of this, an object of the present invention is to provide a gas furnace that can maintain a good combustion state even if the distance between the conditioning container and the gas burner is shortened. [Solution 1] In order to solve the aforementioned problem, the present invention provides a gas furnace, which is provided on the stove body with a gas burner facing the opening of the stove, and at the same time, the blower burns the gas burner. A person who is forced to supply air with secondary air and the stove opening is opened on the top plate is characterized in that the combustion secondary air is blown toward the gas ejection part from the flame hole of the gas burner and has the stove opening. The vortex shape of the vortex motion component in the circumferential direction. According to the aforementioned structure, the swirling motion energy possessed by the secondary air for combustion can effectively generate a vortex in the flame. Therefore, even if the distance between the conditioning cereal and the gas burner is shortened, the time for the flame to reach the conditioning container can be fully ensured, and the combustion reaction is ended before the flame reaches the steel bottom to maintain a good combustion state. Here, if a gas supply passage having a concentric ring shape with the opening of the stove is provided, and the injection and milk passages have a red portion of air from the blower and an air outlet portion of the air opening toward the gas outlet portion, and the air The motion component of the tangent line 2 of the air supply passage may flow into the air supply passage from the above-mentioned flow-through part, and then the Jade disorder road is circling and blows out from the blowing part and has the aforementioned thirst-rotating motion component. In addition, it is also possible to provide a saki guide in the air and 77 degrees in the air and tilted in the circumferential direction at or near the blow-out part. At this time, 200406562 does not need to make the air flow in a tangential direction like a bear path. The down-flow gas supply 5 10, and if the gas burner is arranged below the top plate and is constituted by an internal flame type burner with a shape and a burner head facing inward, the number of burners and the furnace With a concentric ring-shaped opening, even if it is a high-calorific welding, the diameter of the opening of the stove can be reduced and the shape of the top plate is good. " ° Time also ^ This hope, by causing the secondary air for combustion to blow out at least above the burner head toward the gas ejection portion from the flame hole and presenting a thirst swirling motion component having a circumferential direction of the opening of the stove The vortex shape can effectively make the flame vortex. In order to blow out the secondary air for combustion in accordance with this, at least one of the following methods may be adopted, that is, a ring-shaped air supply path surrounding the burner head from the outside is provided, and the air supply path is provided with air from the blower Inflow and at least above the burner head
15 位置朝前述瓦斯喷出部開口之空氣之吹出部，並且使空氣 於具有供氣通路切線方向之運動分量狀態下從前述流入部 流入該供氣通路，或，於吹出部或其附近設置施加渦漩運 動分量於空氣且朝周方向傾斜之渦漩導件。 I：實施方式315 position of the air blowing portion opening toward the gas discharge portion, and the air flows into the air supply passage from the inflow portion in a state of a movement component having a tangential direction of the air supply passage, or an application is provided at or near the blowout portion A vortex guide having a vortex motion component in the air and inclined in the circumferential direction. I: Embodiment 3
發明之實施形態 參照第1圖，標號1表示桌上型瓦斯爐之爐具本體。於 20 爐具本體1之上面安裝有由陶瓷玻璃等耐熱玻璃所構成之 玻璃頂板2，且於玻璃頂板2開設有爐具開口 4，並使設置在 爐具本體1之瓦斯燃燒器3面對該爐具開口4。於爐具開口4 係安裝有金屬製之保護環4a而不會從爐具開口 4產生皸 裂。又，於玻璃頂板2之上面位於爐具開口 4之周圍部分一 7 2成有火㈣5 ’蚊”5係於與_頂_存有流動 /㈣d之燃_氣之空隙而支持銷等調理容器P。 。玻璃頂板2間無需其他金屬製火架，且在搖動調理容 益N不會造成火架移動而給使用者不調 於與玻璃頂板2-體之火架部5不_著溢出Μ汁且亦不 會變色，因此亦不會損害玻璃頂板2所具有之外觀性或清掃 性。 又，瓦斯燃燒器3係配置於玻璃頂板2之下方，且由形 成有多數於職H頭_内之焰㈣之㈣式職器所構 成，而該燃燒器頭3a係與爐具開口 4呈同心之環狀，且焰孔 3b雖未圖示但朝周方向傾斜。圖中標號乂係連接燃燒器頭 3&之混合管，且構成為於齡管3味齡從絲於閥單元7 之喷嘴7轉混合管3作射之瓦斯與隨著該噴射而被吸引之 -次空氣而自焰孔3b噴出’且前述閥單元7鶴由設置於爐 具本體1前面之操作子6來操作。 然而，若考慮火架部5之清掃性及強度，則火架部5之 高度宜為lcm以下，且以5mm尤佳。然而，若依此降低火架 部5,則燃燒排氣之排出阻力變大而容易產生燃燒不良之情 形，同時由於容易產生玻璃頂板2之過熱，因此必須設置送 風機8而進行玻璃頂板2之氣冷與對瓦斯燃燒器3進行燃燒 用二次空氣之強制供氣。 故，沿著玻璃頂板2之下面設置藉由送風機8之作動而 強制地使外面空氣流動之通風路9，且使對瓦斯燃燒器3供 給燃燒用二次空氣之供氣通路10與該通風路9之下游端連 通。通風路9係由上游側部分9a與下流側部分所構成，且上 游側部分9 a係連通開設於玻璃頂板2後部之外面空氣取入 口 Η與送風機8之吸入口，下游側部分則與送風機8之吹出 口連通。又，於該下游側部分，在玻璃頂板2與燃燒器頭3a 間之空間設置有環狀通路9b，該環狀通路9b係配置為位在 玻璃頂板2下面之爐具開口 4之周圍部分，且於該環狀通路 9b配置有供氣通路1〇。 更洋而言之，於爐具本體1設置有收納燃燒器頭3a且包 圍火架部5之形成領域下面而接連於玻璃頂板2下面之套管 12,同時於套管12内之中間設置具有於爐具開口4附近接連 於玻璃頂板2下面之内周立起壁13a之分隔板13，且於藉由 分隔板13分隔之套管12内之上方空間構成環狀通路卯，於 下方空間構成供氣通路10。 又，於％狀通路9b，如第2圖所示，於周方向丨處朝切 線方向插入送風機8之吹出導管8a，再者，對吹出導管^之 插入處以由該吹出導f8a之—側壁所構成之劃分壁沾隔離 而於鄰接之分隔板13之部分形成連通環狀通路卯與通氣路 10之連通孔14。依此，外面线從作騎出導管仏之插入 處之入口部分朝作為連通孔14之形成處之出口部分以}周 來流過環狀通路9b，且玻璃頂板2之爐具開口 4之周圍部分 有效氣冷。 在此，連通孔係位於通風路9之下游端，結果，與玻璃 頂板2進行熱交換且到達通風路9謂端而充分昇溫之空氣 會透過供氣it路1〇_燃制H氣供給至瓦斯燃燒器 3。特別是由於在環狀通路％中，空氣以1周來流過玻璃頂 板2最高溫之部分之爐具開口 4之周圍部分，因此燃燒用二 次空氣有效地昇溫。又，作為環狀通路9b内周壁之分隔板 13之立起壁i3a係兼作將瓦斯燃燒器3之火焰導引至爐具開 口 4内之火焰導件之用。 供氣通路10係與爐具開口 4呈同心之環狀，且形成為從 外側包圍燃燒器頭3a，於其内周設有上方吹出部15與下方 吹出部16，該上方吹出部15係於燃燒器頭3a之上方位置朝 來自焰孔3b之瓦斯噴出部開口，下方吹出部16則於燃燒器 頭3a之下方位置朝來自焰孔外之瓦斯喷出部開口。又，上 方=出邛15係構成於燃燒器頭3a與其上側之分隔板13間之 間隙’下方吹出部16則是構成於燃燒器頭％與設置在其下 側之導引板17間之間隙。 又’如第3圖所示’於供氣通路10内設有朝其周方向延 处句[板18 ’且彳< 作為流人部之連通孔流人供氣通路⑺ 立氣係透過夕數形成於均壓板18之透孔咖而 自上下吹 部15、16以燃燒用二次空氣朝瓦斯噴出部吹出。 '在此’從連通孔14係藉由於環狀通路9b之空氣之渴旋 π '、有（、氣通路1G之切線方向之運動分量狀態下流入空 :二空氣亦於供氣通路_朝周方向渦旋 ，而燃燒用 姨二纽上下吹出部Μ、16朝瓦斯噴出部吹出且呈具有 ;二·“尸之周方向騎運動分量之漩渦狀。又，藉由燃燒 、、ώ。 I斤/、有之屑灰運動能量而於火焰有效地產生滿 文即使降低火架部5，火焰到達調理容器ρ之時間亦 變長，且因前述燃燒用二次空氣之昇溫而燃燒速度快，與 其相辅相成而在火焰到達調理容器P前結束燃燒反應且維 持良好之燃燒狀態。 又，來自下方吹出部16之空氣主要是扮演防止火焰朝 下方拉伸之角色，而使火焰產生渦流之任務則主要由來自 上方吹出部15之空氣來擔任，因此，吹出漩渦狀之空氣者 亦可僅構成為上方吹出部15。又，由於在靠近連通孔14之 供氣通路10之渦漩方向上游側部分因離心力之作用而使空 氣不易流入吹出部15、16，因此，使均壓板is之透孔18a直 徑於上游側愈大，且使空氣均勻地從吹出部15、16於全周 吹出。又，亦可省略環狀通路9b並使來自送風機8之空氣直 接從切線方向流入供氣通路1〇。 第4、5圖顯示第2實施形態。該實施形態之主要構造係 與岫述第1實施形態相同，且與第1實施形態相同之構件係 附上與前述相同之標號。與第1實施形態相異處係，於吹出 部15、16設置施加渦漩運動分量於空氣且朝周方向傾斜之 渦漩導件l5a、16a。依此，若設置渦旋導件15a、16a，則 即使未讓空氣從切線方向流入供氣通路1〇，則亦可使燃捧 用二次空氣從吹出部15、16朝瓦斯喷出部噴出且呈漩渦 狀，不過，若從切線方向使空氣流入供氣通路1〇則更為有 效。又，如第4圖之一部分中以假想線所表示，亦可於均壓 板18設置由連通孔18a之穿孔用切起片等所構成且朝周方 向傾斜之渦漩導件18b。 第6圖顯示第3實施形態，係以由形成有多數於環狀燃 200406562 燒器頭3，a外周朝外之焰孔3’b之外焰式燃燒器來構成瓦斯 燃燒器3,者。於該實施形態中，主要構造亦與前述第丨實施 形態相同，且與第1實施形態相同之構件係附上與前述相同 之標號。與第1實施形態相異處係，從環狀供氣通路1〇分出 5與燃燒器頭3，a内周空間連通之通路10a，且使燃燒用二次空 氣從供氣通路10内周之吹出部15’與連通燃燒器頭3\内周 空間之燃燒器頭3’a上之吹出部16’朝來自焰孔3、之瓦斯嘴 出部吹出。此時亦以具有切線方向運動分量來使空氣流人 供氣通路ίο，或於吹出部15’設置渦漩導件而從吹出部15, 10 朝瓦斯喷出部吹出旋渦狀燃燒用二次空氣。為了亦從吹出 部16’吹出漩渦狀空氣，則必須於吹出部16’設置渦旋導件。 又，由於外焰式燃燒器3’火焰容易擴散，因此必須增 加爐具開口4之口徑。相對於此，内焰式燃燒器3則可縮小 爐具開口 4之口徑且玻璃頂板2之外型良好。故，如前述第i 15 實施形態或第2實施形態，係以使用内焰式燃燒器3為佳。 以上說明將本發明應用在桌上型瓦斯爐之實施形態， 然而，在將頂板載置於反面頂端之嵌入式瓦斯爐中亦同樣 適用本發明。又，前述實施形態係於玻璃頂板2開設外面空 氣取入口 11，不過亦可在爐具本體1之側面或底面開設外面 20 空氣取入口。再者，亦可使用金屬製頂板來取代玻璃頂板2。 【圖式簡單說^明】 第1圖係顯示本發明瓦斯爐之第1實施形態之部分切斷 側視圖。 第2圖係第1圖之Η —Η線切斷平面圖。 12 200406562 第3圖係第1圖之III —III線切斷平面圖。 第4圖係顯示本發明瓦斯爐之第2實施形態之部分切斷 側視圖。 第5圖係第4圖之V — V線切斷平面圖。 5 第6圖係顯示本發明瓦斯爐之第2實施形態之部分切斷 側視圖。 【圖式之主要元件代表符號表】 1...爐具本體 9a...上游側部分 2...玻璃頂板 9b...環狀通路 3…瓦斯燃燒器（内焰式燃燒器） 10...供氣通路 3 ’a···瓦斯燃燒器(外焰式燃燒器） 10a...通路 3a，3’a···燃燒器頭 11…外在空氣取入口 3b，3’b...焰孔 12…套管 3c...混合管 13...分隔板 4...爐具開口 13a··.立起壁 4a...保護環 14···連通孔(流入部） 5...火架部 15，15’，16，16’···吹出部 6...操作子 15a，16a，18b·.·渦旋導件 7...閥單元 17...導引板 7a...喷嘴 18...均壓板 8...送風機 18a...透孔 8a...吹出導管 P...調理容器 9...通風路 13Embodiment of the Invention Referring to Fig. 1, reference numeral 1 denotes a stove body of a table type gas stove. A glass top plate 2 made of heat-resistant glass such as ceramic glass is installed on the 20 stove body 1, and a stove opening 4 is opened on the glass top plate 2, and the gas burner 3 provided on the stove body 1 faces The stove opening 4. A metal protective ring 4a is installed on the stove opening 4 so as not to cause cracks from the stove opening 4. In addition, on the top of the glass top plate 2 located around the opening 4 of the stove, a fire maggot 5 'mosquito' 5 is attached to the gap between the _ top _ where there is a flowing / ㈣ d _ gas and supporting pins and other conditioning containers P. There is no need for other metal fire racks between the two glass top plates, and the adjustment of the Rong Yi N will not cause the fire frame to move while shaking, so that the user will not adjust the glass frame 2 to the fire frame part 5 of the glass top plate. And it will not change color, so it will not damage the appearance or cleaning performance of the glass top plate 2. In addition, the gas burner 3 is arranged below the glass top plate 2 and has a majority of working heads. The burner head 3a is composed of a burner head, and the burner head 3a is in a concentric ring shape with the stove opening 4, and the flame hole 3b is inclined in the circumferential direction although not shown. The reference mark 乂 in the figure is connected to the burner. The head 3 & mixing tube, and is constituted by the aging tube 3 and the flavor tube from the nozzle 7 of the valve unit 7 to the mixing tube 3 for gas injection and the secondary air that is attracted by the injection and the flame hole 3b Blow out 'and the aforementioned valve unit 7 crane is operated by an operator 6 provided in front of the stove body 1. However, if we consider For the cleanability and strength of the frame portion 5, the height of the fire frame portion 5 should be 1 cm or less, and more preferably 5 mm. However, if the fire frame portion 5 is lowered accordingly, the exhaust resistance of the combustion exhaust gas becomes large and easily generated. In the case of poor combustion, because the glass top plate 2 is likely to overheat, it is necessary to provide a blower 8 for air cooling of the glass top plate 2 and forced air supply of the secondary air for combustion of the gas burner 3. Therefore, the glass A ventilation path 9 is provided below the top plate 2 to force the outside air to flow by the action of the blower 8 and an air supply path 10 for supplying the combustion secondary air to the gas burner 3 is communicated with the downstream end of the ventilation path 9 The ventilation path 9 is composed of an upstream side portion 9a and a downstream side portion, and the upstream side portion 9a is connected to the air intake port Η on the outer surface of the rear portion of the glass roof 2 and the suction port of the blower 8, and the downstream portion is connected to the blower The blower outlet of 8 communicates. In the downstream portion, an annular passage 9b is provided in the space between the glass top plate 2 and the burner head 3a. The annular passage 9b is a furnace disposed below the glass top plate 2. A gas supply passage 10 is arranged around the opening 4 in the annular passage 9b. More specifically, a stove body 1 is provided with a burner head 3a and surrounds the lower surface of the formation area of the fire frame portion 5, A sleeve 12 connected to the lower surface of the glass top plate 2 is provided, and a partition plate 13 having an inner peripheral rising wall 13a connected to the lower surface of the glass top plate 2 near the stove opening 4 is provided in the middle of the sleeve 12 and is separated by The upper space inside the sleeve 12 partitioned by the plate 13 constitutes an annular passage 卯, and the lower space constitutes an air supply passage 10. Also, as shown in Fig. 2, the% passage 9b is inserted in the tangential direction in the circumferential direction 丨The blow-out duct 8a of the blower 8 is further separated from the inlet of the blow-out duct ^ by a partition wall formed by the blow-out guide f8a-side wall, and a communication loop path is formed in the adjacent partition plate 13 and communicates with the ventilation. The communication hole 14 of the road 10. According to this, the outer line flows through the annular passage 9b from the entrance portion of the insertion place where the riding-out duct 仏 is inserted to the exit portion serving as the formation of the communication hole 14, and the periphery of the stove opening 4 of the glass top plate 2 Partially effective air cooling. Here, the communication hole system is located at the downstream end of the ventilation path 9, and as a result, the air that has undergone heat exchange with the glass top plate 2 and reached the 9th end of the ventilation path and has sufficiently warmed will pass through the air supply path 10__combustion H gas to be supplied to Gas burner 3. In particular, in the annular passage%, air flows through the periphery of the stove opening 4 of the highest temperature portion of the glass top plate 2 in one week, so the secondary air for combustion is effectively heated. In addition, the rising wall i3a of the partition plate 13 as the inner peripheral wall of the annular passage 9b serves also as a flame guide for guiding the flame of the gas burner 3 into the furnace opening 4. The air supply passage 10 is formed in a concentric ring shape with the stove opening 4, and is formed to surround the burner head 3a from the outside. An upper blowout portion 15 and a lower blowout portion 16 are provided on the inner periphery of the burner head 3a. The upper position of the burner head 3a opens toward the gas ejection portion from the flame hole 3b, and the lower blowout portion 16 opens at the lower position of the burner head 3a toward the gas ejection portion from outside the flame hole. Moreover, the upper part = the exit 15 is formed between the burner head 3a and the partition plate 13 on the upper side. The lower blowing part 16 is formed between the burner head% and the guide plate 17 provided on the lower side. gap. Also, as shown in FIG. 3, a sentence [plate 18 'is provided in the gas supply passage 10 in a circumferential direction and 彳 < serves as a communication hole for the flow of people. The number of through-hole coffees formed in the pressure equalizing plate 18 is blown from the upper and lower blowing portions 15 and 16 toward the gas blowing portion by the secondary air for combustion. 'Here' from the communication hole 14 is due to the thirst of air π due to the air in the annular passage 9b, and the air flows into the air under the state of the motion component in the tangential direction of the air passage 1G: the second air is also in the air supply passage_ 朝 周Vortex in the direction, and the upper and lower blowing parts M and 16 of the combustion engine are blown toward the gas spouting part and have a vortex shape of the riding component in the direction of the perimeter of the body. / 、 Small ash motion energy can effectively generate full text on the flame. Even if the fire frame part 5 is lowered, the time for the flame to reach the conditioning container ρ becomes longer, and the combustion speed is fast due to the heating of the aforementioned secondary air for combustion. Complement each other and end the combustion reaction before the flame reaches the conditioning container P and maintain a good combustion state. In addition, the air from the lower blowing portion 16 mainly plays a role of preventing the flame from stretching downward, and the task of causing the flame to vortex is mainly caused by The air coming from the upper blowing part 15 serves as the upper blowing part 15. Therefore, the person blowing the vortex-shaped air can be constituted only as the upper blowing part 15. Since it is upstream of the vortex direction of the air supply path 10 near the communication hole 14, Part of the effect of centrifugal force makes it difficult for air to flow into the blowout sections 15, 16; therefore, the diameter of the through hole 18a of the pressure equalizing plate is larger on the upstream side, and the air is uniformly blown out from the blowout sections 15, 16 over the entire circumference. It is also possible to omit the annular passage 9b and let the air from the blower 8 directly flow into the air supply passage 10 from the tangential direction. Figures 4 and 5 show the second embodiment. The main structure of this embodiment is the same as the first embodiment described above. The components of the same form and the same as those of the first embodiment are given the same reference numerals as above. Different from the first embodiment, the blowing portions 15 and 16 are provided with a vortex motion component in the air and inclined in the circumferential direction. The vortex guides 15a and 16a. Accordingly, if the vortex guides 15a and 16a are provided, even if air is not allowed to flow into the air supply path 10 from the tangential direction, the secondary air for combustion can also be discharged from the blow-out portion. 15 and 16 are vortexed toward the gas ejection portion, but it is more effective to allow air to flow into the air supply path 10 from a tangential direction. Also, as indicated by the imaginary line in part of Fig. 4, it may be A communication hole 18a is provided in the pressure equalizing plate 18 The vortex guide 18b, which is formed by a perforated cutting piece and is inclined in the circumferential direction. Fig. 6 shows a third embodiment, which is formed by forming a large number of burner heads 400406562 in a ring shape. The flame hole 3'b is composed of a flame burner other than the flame burner. In this embodiment, the main structure is also the same as the aforementioned first embodiment, and the same components as the first embodiment are attached. The same reference numerals as above. Different from the first embodiment, 5 is divided from the ring-shaped air supply passage 10 and the passage 10a communicating with the inner peripheral space of the burner head 3, a, and the secondary air for combustion is removed from The blow-out portion 15 'on the inner periphery of the air supply passage 10 and the blow-out portion 16' on the burner head 3'a communicating with the burner head 3 \ in the inner space are blown toward the gas nozzle outlet portion from the flame hole 3. At this time, the tangential direction motion component is also used to make the air flow into the air supply path, or a vortex guide is provided in the blowing portion 15 ', and the secondary air for swirling combustion is blown from the blowing portions 15, 10 toward the gas blowing portion. . In order to blow out the swirling air from the blowing portion 16 ', it is necessary to provide a vortex guide in the blowing portion 16'. In addition, since the flame of the external flame type burner 3 'easily spreads, it is necessary to increase the diameter of the opening 4 of the stove. On the other hand, the inner flame burner 3 can reduce the diameter of the stove opening 4 and the shape of the glass top plate 2 is good. Therefore, as in the aforementioned i 15th embodiment or the second embodiment, it is preferable to use the internal flame type burner 3. The above description is an embodiment in which the present invention is applied to a table-type gas furnace. However, the present invention is also applicable to an embedded gas furnace in which a top plate is placed on the top of the reverse side. In the foregoing embodiment, the outside air inlet 11 is provided on the glass top plate 2. However, the outside 20 air inlet may be provided on the side or bottom of the stove body 1. Furthermore, a metal top plate may be used instead of the glass top plate 2. [Brief Description of the Drawings] Figure 1 is a side view showing a partial cut of the first embodiment of the gas furnace of the present invention. Figure 2 is a plan view of the line Η—Η of Figure 1. 12 200406562 Figure 3 is a plan view taken along line III-III in Figure 1. Fig. 4 is a partially cut-away side view showing a second embodiment of the gas furnace according to the present invention. Figure 5 is a plan view taken along the line V-V in Figure 4. 5 Fig. 6 is a partially cut-away side view showing a second embodiment of the gas furnace according to the present invention. [Representative symbols for the main components of the figure] 1 ... stove body 9a ... upstream part 2 ... glass top plate 9b ... annular passage 3 ... gas burner (inner flame burner) 10 ... Air supply path 3 'a ... Gas burner (outer flame type burner) 10a ... Path 3a, 3'a ... Burner head 11 ... External air inlets 3b, 3'b ... flame hole 12 ... casing 3c ... mixing pipe 13 ... dividing plate 4 ... furnace opening 13a ... standing wall 4a ... protection ring 14 ... communication hole (inflow Parts) 5 ... Fire stand parts 15,15 ', 16,16' ... Blowout part 6 ... Operators 15a, 16a, 18b ... Vortex guide 7 ... Valve unit 17 .. Guide plate 7a ... nozzle 18 ... pressure equalizing plate 8 ... fan 18a ... through hole 8a ... exhaust duct P ... conditioning container 9 ... ventilation path 13