200940907 . 六、發明說明： 【發明所屬之技術領域] - 本發明係有關一種用以燃燒燃料氣體與燃燒用空# .預混合氣體等的燃燒加熱器。本案係根據在2009年之 曰向日本申請之特願2008-22976號主張優先權，在 1 其内容。 杈用 【先前技術】 β 一以往7有—種輻射管織器，係在耐熱材料製造之 圓管（散熱管）内，燃燒燃料氣體與燃燒用空氣之全預混人 氣，利用其火焰使該散熱管赤熱者，其作為不露出火^ 細長發熱源而使用於加熱爐、暖氣機等。再者，有一種習 ，之燃燒加熱器，係使燃燒用氣體在内管中燃燒，使燃燒 氣體之喷流與正交裝設之遮蔽面衝突而改變流向， 管導出熱者。 熱 此種燃燒加熱器，因燃燒會在散熱管途中部分終止， ❹難以沿全長獲得均勻之溫度分布，且有產生多量之氮氧化 ，（Ν0χ)之缺點。於是，在專利文獻1揭示-種燃燒加熱 器，係由内部為預混合氣之供應路徑之多孔質管，及以同 軸方式配置在多孔質管外周之散熱管所構成，使由多孔質 管喷出成放射線狀而成為層流之預混合氣體在放射管與多 孔質管之中間燃燒’並且在火焰傳輸速度與預混合氣之流 速能均衡之圓筒面燃燒，藉此得以使整體散熱管均句地高 溫化，容易大量發熱，實現低NOx。 [專利文獻1]日本特開平6—241419號公報 3 320996 200940907 【發明内容】 (發明所欲解決之課題） 但是在上述習知技術中有如下之問題存在。 配置在作為散熱管之外管内部之内管，因流動於外周 之燃燒氣體而形成相當高溫，以致流動於内管之燃燒氣體 溫度過度上昇，如未燃燒氣體為燃料與氧化劑之混合氣體 時，會有引發自燃而造成燒損之可能性。 又，亦有因熱造成内管之畸變而產生殘留變形等而無 法獲得所希望之燃燒特性（加熱特性）的可能性。 本發明係考量上述問題而研創者，其目的在於提供一 種燃燒加熱器，可抑制内管之過度高溫化，並且可提高加 熱效率。 (解決課題之手段） 為了達成上述目的，本發明採用如下構成。 本發明之燃燒加熱器係具有：内管，其内部具備燃燒 用氣體供應路徑；及外管，隔著燃燒空間而配置在内管外 周，而在上述内管管壁形成有喷出上述燃燒用氣體之孔 部；其中，在上述内管外周具有輻射促進面。 於本發明之燃燒加熱器中，因從被加熱而溫度上昇之 内管促進熱的放射而成為輕射熱（放射熱）^故得以抑制内 管之過度高溫化。又，因從内管放射之輻射熱而對外管加 熱，故亦可提高經由外管進行之加熱效率。再者，内管為 低溫時，因輻射所產生之熱傳輸量小，故對於供應路徑之 燃燒氣體（未燃氣體）之加熱幾乎不會有影響（因輻射產生 320996 200940907 之熱傳輸係與溫度之4次方成正比）。 外周較佳〜一管 藉此，本發明可利用塗裝、塗 覆蓋輕射促進材，而容易地形=式在内管外周面 又，本發明亦可適用在上述外管=面。 射促進面之構成。 内周面具有上述輻 Ο ❹ 火二來咖 加提升經由外管進行之加熱效率。促進面）之輕射熱，而更 於上述構成中，適合於採用 述内周面之被膜層。、 迷輻射促進面為設在上 由此，本發明係採用塗裝、务 :促可容易—=管内周面 可為由輻射促進材形::二:;之::被膜層之外，亦 又’就上述輻射促進 ， 劑形成之構成。 q，亦適合採用由陶瓷黏合 =件係在上述燃該傳 在上述外管與上述内管之間傳熱。 ”上述内官，且 管二可此抑二發二由傳熱構件將内管之熱傳熱至外 行之加熱效率。度希溫化，同時可提升經由外管進 320996 5 200940907 又，本發明亦適合採用以下構成：上述内管之外周面 為具有與上述外管之内周面間之距離為最短之第1區域、 及比上述第1區域長之第2區域，而上述孔部係配置於上 述第1區域，且在上述外管之内周面上形成上述燃燒用氣 體之停滯點（stagnation point)。 於此燃燒加熱器中，藉由對流速幾近零之停滯點周邊 之燃燒用氣體點火，即可容易（即不致增加成本）形成穩定 之火焰並予以保持。以往，為了形成停滯點，必須加快氣 體之流速，如此則無法充分地確保燃燒氣體之排氣路徑， 而且火焰會到達外管内周面，而有可能僅在軸方向之兩端 形成火焰。對此，本發明係藉由在與外管内周面之距離為 最短之第2區域形成孔部，即可在與孔部相對向之外管内 周面穩定地形成火焰並予以保持，同時可在例如包含與第 1區域相反側之區域之第2區域與外管内周面間確保燃燒 氣體之排氣路徑。 再者，本發明係在外管内周面之停滯點形成火焰並予 以保持，因此可經由外管有效率地進行加熱。 上述内管係適合採用：配置在對上述外管偏心之位 置，且上述孔部形成在位於上述内管之偏心方向之外周面 的構成。 由此，本發明係可容易地於形成内管之外周面與外管 之内周面之距離較短之第1區域。 將内管相對於外管偏心配置時，亦適合採用在上述外 管之中心周圍，朝周方向隔著間隔配設多數個上述内管之 6 320996 200940907 - 構成。 由此，於本發明中，可在對外管内周面朝周方向隔著 間隔形成多數火焰並予以保持，而可更有效地加熱。 . 又，本發明亦可適合採用上述内管與上述外管配置為 同心之構造。 又，本發明適合採用具有支撑構件之構成，該支撐構 件係將在基端側懸臂支撑之上述内管前端，支撑在此内管 與上述外管之間，而保持上述内管之外周面與上述外管之 Ο 内周面之間隔。此支撑構件係可為板狀，或懸架在外管與 内管間之棒狀。 由此，本發明可防止於内管前端部產生搖動，且在基 端侧與前端側之内管外周面與外管内周面之間隔變得不一 定，而可將形成有孔部之第1區域與外管内周面間之間隔 保持為固定。因此，可繼續穩定地形成停滯點，結果，可 穩定且繼續地形成火焰並予以保持。 © 又，本發明適合採用具有停滯點形成構件之構成，該 停滯點形成構件係沿著軸方向而以與上述孔部相對向之方 式，設在上述燃燒空間且形成自上述孔部喷出之上述燃燒 用氣體之停滯點。 因此，本發明之燃燒加熱器，係藉由對在停滯點形成 構件表面所形成之流速幾近零之停滯點周邊之燃燒用氣體 進行點火（著火），即可容易地（即不增加成本）形成穩定之 火焰並予以保持。以往，為了形成停滯點必須加快氣體之 流速，如此則無法充分地確保燃燒氣體之排氣路徑，同時 7 320996 200940907 火焰會到達外管内周面’以致火焰可能僅 兩端側。對此’本發明係在與孔部相對向之 心 件未相對向之區域確保燃燒氣體之排=徑〜點形成構 上述停滞點形成構件適合採用：配置 Ο 使上述孔部朝向上述中心轴而在二 軸周圍配置多數個之構成。 甲 由此’於本發明係可在外 燒用氣體之停滯點與火焰並予 分布一邊加熱外管。 管中心軸周圍穩定地形成燃 以保持，且可一邊抑制溫度200940907. VI. Description of the Invention: [Technical Field to Which the Invention Is Applicable] - The present invention relates to a combustion heater for burning a fuel gas, a combustion air, a premixed gas, and the like. This case claims priority based on Japanese Patent Application No. 2008-22976, which was filed in Japan in 2009.先前[Prior Art] β A radiant tube woven device of the past 7 is a pre-mixed gas of combustion fuel gas and combustion air in a round pipe (heat pipe) made of heat-resistant materials, using the flame to make the The heat pipe is hot, and it is used in a heating furnace or a heating machine as a heat source that does not expose the fire. Further, there is a conventional combustion heater which burns a combustion gas in an inner tube, causes a jet of combustion gas to collide with a shielding surface of the orthogonal installation to change the flow direction, and the tube derives the heat. Heat This kind of combustion heater is partially terminated on the way of the heat pipe due to combustion. It is difficult to obtain a uniform temperature distribution along the entire length, and it has the disadvantage of generating a large amount of nitrogen oxidation, (Ν0χ). Then, Patent Document 1 discloses a combustion heater in which a porous tube having a supply path of a premixed gas inside and a heat pipe disposed coaxially around the outer periphery of the porous tube are used to spray the porous tube. The premixed gas which is formed into a radial flow and becomes a laminar flow is burned in the middle of the radiation tube and the porous tube and burns on the cylindrical surface in which the flame transfer speed and the flow rate of the premixed gas are equalized, thereby making the entire heat pipe The temperature of the sentence is high, and it is easy to generate a lot of heat to achieve low NOx. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The inner tube disposed inside the tube as the heat pipe is formed at a relatively high temperature due to the combustion gas flowing around the outer circumference, so that the temperature of the combustion gas flowing through the inner tube excessively rises, for example, when the unburned gas is a mixed gas of fuel and oxidant, There is a possibility of causing spontaneous combustion and burning. Further, there is a possibility that residual deformation or the like may occur due to distortion of the inner tube due to heat, and desired combustion characteristics (heating characteristics) may not be obtained. The present invention has been made in view of the above problems, and an object thereof is to provide a combustion heater which can suppress excessive temperature increase of an inner tube and can improve heating efficiency. (Means for Solving the Problem) In order to achieve the above object, the present invention adopts the following configuration. The combustion heater according to the present invention includes: an inner tube having a combustion gas supply path therein; and an outer tube disposed on an outer circumference of the inner tube via a combustion space, wherein the inner tube wall is formed to discharge the combustion a hole portion of the gas; wherein the outer circumference of the inner tube has a radiation promoting surface. In the combustion heater of the present invention, since the inner tube which is heated and the temperature rises promotes the emission of heat and becomes the light-radiating heat (radiation heat), the excessive temperature of the inner tube is suppressed. Further, since the outer tube is heated by the radiant heat radiated from the inner tube, the heating efficiency through the outer tube can be improved. Furthermore, when the inner tube is at a low temperature, the amount of heat transfer due to radiation is small, so there is almost no influence on the heating of the combustion gas (uncombusted gas) in the supply path (the heat transfer system and temperature of 320996 200940907 are generated by the radiation) The 4th power is proportional to). The outer circumference is preferably one tube. Therefore, the present invention can be applied to the outer peripheral surface of the inner tube by coating or coating the light-emitting material, and the present invention can also be applied to the outer tube=face. The composition of the shot promotion surface. The inner peripheral surface has the above-described radiant heat to increase the heating efficiency through the outer tube. The light-emitting heat of the surface is promoted, and in the above configuration, it is suitable to use the film layer of the inner peripheral surface. The radiation-promoting surface is provided on the basis of the above, and the invention adopts coating, and the work can be facilitated—the inner circumferential surface of the tube can be shaped by radiation: 2:;:: outside the film layer, In addition, the above radiation is promoted and the composition of the agent is formed. q, which is also suitable for heat transfer between the outer tube and the inner tube by the ceramic bonding. "The above-mentioned internal official, and the second can be used to suppress the heat transfer of the inner tube by the heat transfer member to the heating efficiency of the outer tube. The temperature can be increased and the temperature can be increased through the outer tube. 320996 5 200940907 It is also preferable that the outer peripheral surface of the inner tube has a first region having the shortest distance from the inner circumferential surface of the outer tube and a second region longer than the first region, and the hole portion is disposed. In the first region, a stagnation point of the combustion gas is formed on an inner circumferential surface of the outer tube. In the combustion heater, the combustion is performed by a periphery around a stagnation point where the flow velocity is near zero. When the gas is ignited, it is easy (ie, without increasing the cost) to form a stable flame and maintain it. In the past, in order to form a stagnation point, the flow rate of the gas must be increased, so that the exhaust path of the combustion gas cannot be sufficiently ensured, and the flame can be reached. In the inner circumferential surface of the outer tube, it is possible to form a flame only at both ends of the axial direction. In the present invention, the hole portion can be formed in the second region having the shortest distance from the inner circumferential surface of the outer tube. The flame is stably formed and held by the inner peripheral surface of the tube opposite to the hole portion, and the exhaust gas path of the combustion gas can be secured between the second region including the region on the opposite side to the first region and the inner peripheral surface of the outer tube. According to the present invention, the flame is formed and held at the stagnation point of the inner peripheral surface of the outer tube, so that the outer tube can be efficiently heated. The inner tube is preferably disposed at a position eccentric to the outer tube, and the hole portion is The present invention is configured to be formed on the outer peripheral surface of the inner tube in the eccentric direction. Thus, the present invention can easily form the first region in which the distance between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube is short. When it is disposed eccentrically with respect to the outer tube, it is also suitable to adopt a configuration in which a plurality of the inner tubes are disposed at intervals around the center of the outer tube in a circumferential direction. Thus, in the present invention, the external tube can be externally The inner circumferential surface of the tube forms a plurality of flames at intervals in the circumferential direction and is held, and can be heated more efficiently. Further, the present invention can also be suitably configured such that the inner tube and the outer tube are disposed concentrically. Further, the present invention is preferably configured to have a support member that supports the front end of the inner tube supported by the cantilever at the proximal end side between the inner tube and the outer tube while maintaining the inner tube The outer peripheral surface is spaced apart from the inner peripheral surface of the outer tube. The support member may be in the shape of a plate or a rod suspended between the outer tube and the inner tube. Thus, the present invention prevents the front end portion of the inner tube from being shaken. Further, the interval between the outer peripheral surface of the inner tube on the proximal end side and the distal end side and the inner peripheral surface of the outer tube does not necessarily become constant, and the interval between the first region in which the hole portion is formed and the inner peripheral surface of the outer tube can be kept constant. The stagnation point can be stably formed, and as a result, the flame can be stably and continuously formed and held. © Further, the present invention is suitable for a configuration having a stagnation point forming member which is along the axial direction and The hole portion is opposed to the combustion space and forms a stagnation point of the combustion gas ejected from the hole portion. Therefore, the combustion heater of the present invention can be easily (i.e., does not increase the cost) by igniting (ignition) the combustion gas around the stagnation point where the flow velocity formed on the surface of the stagnation point forming member is near zero. Form a stable flame and keep it. In the past, in order to form a stagnation point, the flow rate of the gas must be increased, so that the exhaust path of the combustion gas cannot be sufficiently ensured, and at the same time, 7 320996 200940907 the flame reaches the inner peripheral surface of the outer tube so that the flame may only be on both end sides. In the present invention, it is preferable that the stagnation point forming member is formed in a region where the combustion gas is not opposed to the region in which the core portion is opposed to the hole portion. The stagnation point forming member is preferably disposed such that the hole portion faces the center axis. A plurality of configurations are arranged around the two axes. In the present invention, the outer tube can be heated while the stagnation point of the external combustion gas is distributed with the flame. The center axis of the tube is stably formed and maintained, and the temperature can be suppressed while
又’本發明係適合细具有支撑構件之構成，該支^ 構件係將在基端㈣臂域之上舶管前端及上述停滞黑: 形成構件之前端支撑在與上述外管之間，而保持上述内管 與上述停滯點形成構件之外周面與上述外管之内周面間之 間隔。此支撑構件可為板狀，或懸架在外管與内管間^棒 狀。Further, the present invention is suitable for a structure having a support member which is to be preceded by a front end of the base end (four) arm and the stagnant black: the front end of the forming member is supported between the outer tube and the outer tube while remaining The inner tube is spaced from the outer peripheral surface of the stagnation point forming member and the inner peripheral surface of the outer tube. The support member may be in the form of a plate or may be suspended between the outer tube and the inner tube.
由此’本發明可防止在内管及停滯點形成構件之前端 邻發生搖動，使在基端側與前端側之内管與停滯點形成構 件之外周面與外管内周面之間隔變得不一定，而可將孔部 與停滞點形成構件與外管内周面間之間隔保持為固定。因 此’可繼續穩定地形成停滯點，結果可穩定且繼續形成火 焰並予以保持。 又’本發明適合採用：比位於最前端之上述孔部配置 在更前端側之上述支撐構件，設成玎封閉上述整個燃燒空 8 320996 200940907 - 間之大小之構成。 由此’本發明可避免，燃燒用氣體滯留於低溫之外管 ' 前端部’成為未燃燒狀態而產生一氧化碳之問題。 上述支撑板係適合採用設成可相對於上述外管朝轴方 向相對移動自如之構成。 由此’本發明係即使因外管與内管之溫度差，尤其是 在軸方向熱膨張量產生較大差時，因支撑板往外管相對移 ❹動之故，支撑板不致發生變形等，而可保持内管外周面與 外管内周面間之間隔。 ^ 又，本發明適合採用設有第2孔部之構成，該第2孔 部係在上述内管與上述停滯點背離之位置，噴出上述燃燒 用氣體。 由此，本發明可將形成並保持在停滯點之火焰，移火 至自第2孔部喷出之燃燒用氣體。因此，於本發明中不會 發生如使用多孔質體時之壓力耗損。又，不必加長内管與 〇外管也可增加投入熱量，因此可避免加長内管與外管時之 機器大型化。而是，本發明因能抑制壓力耗損，故在低壓 之都市氣管中亦可使用。 上述第2孔部係適合採用以下構成··配置在夾住上述 第1區域之兩側，同時在沿上述第1區域之方向與上述孔 部父互配置之構成，或配置在夾住與上述停滯點形成構件 相對向之區域的兩侧，同時在沿上述相對向區域之方向與 上述孔部交互配置之構成。 由此，本發明可使火焰之形成•保持及火焰之移火以等 320996 9 200940907 分布產生。 、丄处供給路徑在 述前端侧被封閉之構成。 由此，本發明可自基端側供庫概 現能排出排氣氣體之小型且低廉二體’同時可實 (發明之效果） -’*，、燒加熱态。 可抑制内管之過度高溫 依據本發明之燃燒加熱器 化’亦可使加熱效率提升。 【實施方式】 二下：、?、第1圖至第8圖說明本發明燃燒加教哭之丧 ==下說明之各圖式中，為了可辨識各 而適* Q更各構件之比例尺。 (第1實施形態） 之正面剖面 第1Α圖為第1實施形態之燃燒加熱器 圖，第1β圖為其側面剖面圖。 燃燒加熱器1之概略構成係由以下構件構成：外管 10 為封閉前端之耐熱金屬製的散熱管，·及耐熱金 之内管20，在基端糾第Μ ®之左側）由未圖示之支撑、 段以懸臂所支撑而配設在外管1G之内部，在其内部具有燃 燒用氣體G之供應路徑。 ·' 燃燒用氣體G係可使用預混合燃料與空氣之氣體，或 預此合燃料與含氧氣體之氣體，燃料則可使用甲院或丙炫 等。又’液體燃料只要設有預蒸發之部位即可使用。 外管10係形成封閉前端之有底圓筒形狀，在基端側連 320996 200940907 . 接有排出燃燒過之氣體之排氣管11。又，在外管10之内 周面10A成膜有促進輻射之輻射促進層（輻射促進面） - 10B。有關此輻射促進面10B留待後述。 , 内管20如同外管10,形成封閉前端之有底圓筒形狀， 在基端側連接有供給上述燃燒用氣體G之預混合氣供應機 構（未圖示），例如供應空氣過剩率約1. 0至1. 6之全預混 合氣體。 I 此内管20係在前端側偏心配置在外管10之内側，在 ❹ 其外周面20A與外管10之内周面10A之間形成有燃燒空間 30。在内管20之與燃燒空間30對向的外周面20A，如同 上述輻射促進層10B，成膜有促進輻射之輻射促進層（輻射 促進面）20B。 輻射促進層1 OB、20B係例如使用陶变黏合劑，以藉由 熔射覆蓋設置在内周面10A與外周面20A覆蓋層所形成。 此覆蓋層為例如可使用耐熱溫度約800°C者。又，藉由以 ❿熔射形成輻射促進層10B、20B，即可謀求高黏著力、長壽 命。 内管20之外周面20A係具有：與外管10之内周面10A 之距離為最短之第1區域22 ;及比第1區域22長之第2 區域23。更具體而言，外周面20A之中，位於内管20之 偏心方向（第1圖中、下方向，參照第1B圖）部分，係沿著 軸方向形成有外管10之内周面10A之距離為最短之第1區 域（母線）22,而在其他區域形成有與内周面10A之距離比 第1區域22長之第2區域23。 11 320996 200940907 在此第1區域22,位於内管2〇之前端侧，沿第}區 域22彼此隔著間隔且沿著直徑方向貫穿管壁而形成有多 數個（在此為5個）孔部24。在外管1Q之與孔部24相對向 之位置附近裝設有未圖示之點火裝置。 再者，比形成有孔部24之區域更靠近基端側（第j圖 為左側）之外周面2GA ’係設為藉由已燃燒氣體（火焰）對供 應路牷21之燃燒用氣體g進行預熱用之預熱區域p。 接著，說明上述燃燒加熱器1之燃燒動作。 自預混合氣供應機構對内管20之供應路徑21所供應 之燃燒用氣體G ’係自孔部24向外f 1Q之内周面i〇a喷 出。 ' 在此，孔部24係形成在外管1〇之内周面1〇A之距離 為最短之第1區域22,因此自孔部24喷出之燃燒用氣體g 係與相對向之外管10之内周面1〇A衝突，在每一個孔部 24之内周面i〇A上形成停滞點s，以此停滯點s為境界而 沿内周面10A被分歧。 於是，藉由點火裝置，對停滯點s附近之燃燒用氣體 點火，而形成火焰。又，在停滯點s附近分歧之燃燒用氣 體G係自剖面面積小之第i區域22之附近流向與剖面面積 較大之第1區域22之相反側之燃燒空間，如第1B圖所示， 在夾住燃燒空間3 0之内管2 〇之兩侧形成火焰ρ。 此時，由於停滯點S之氣體流速為零，且由於向停滯 點s之噴流周圍所形成之循環流，故所形成之火焰得以穩 定地保持。 320996 12 200940907 • 再者，燃燒氣體雖係流經燃燒空間30而自排氣管^ 排出，但在燃燒空間30至排氣管11之途中，在内管2〇之 預熱區域P經由内管2G之管壁，與燃燒用氣體（未燃燒氣 . 體）G進行熱交換。 由$，在供應路徑21之燃燒用氣體G，係在被高溫預 熱之狀態下自孔部24喷出，火焰F之穩定性增加，即使喷 出至狹窄之燃燒空間30，也不會產生未燃埯部θ分而可穩定 地燃燒。 〇 又，因燃燒氣體產生之熱、及火焰F產生之熱特別會 使内管20呈高溫，但是由於在内管20之外周面2〇A設有 輻射促進層20B，因此内管20之熱放射率會增加而促進作 為輻射熱之放射（輻射）。另一方面，在外管之内周面 10A亦設有輻射促進層10B，因此也可促進吸收來自内管 20之輻射熱與火焰f之輻射熱。 如上所述，於本實施形態中，因内管2〇所具有之輻射 ❹促進層20B，使内管20之熱作為輻射熱而促進放射。所以 可抑制内管20之過度高溫化，而且即使在溫度低時因輻射 能力降低，而可將内管20所具有之大部分熱利用於内部之 燃燒用氣體G之加熱（預熱），而可維持加熱特性。因此， 藉由調整輻射促進層20B之構造（材質、厚度、分布等）， 亦可調整對燃燒用氣體G之預熱温度。 又，可藉由此輻射熱加熱外管1〇，而提高經由外管1〇 進行之加熱效率。尤其是於本實施形態中，因在外管10之 内周面10A亦設有輻射促進層1〇β，因此可有效地使外管 13 320996 200940907 10吸收燃燒空間30之熱’可更加提高經由外管ι〇進行之 加熱效率。 又，於本實施形態中，因自形成在内管20管壁之孔部 24喷出燃燒用氣體G ’且在停滯點S保持火焰F，因此不 像設置多孔質管時之情形會增加成本，即使改變流量時亦 ’ 可容易地形成穩定之火焰F。此外’於本實施形態中，為 了增加燃燒量，僅增加孔部24之數量即可。因此構成零件 亦少，構造簡單而可減低燃燒加熱器1之製造成本，同時 不像使用多孔質管時之情形，無需大幅提升燃燒用氣體G ❹ 之供應壓力’即使在低壓之都市氣管中亦可充分地適用。 再者，在本實施形態中’由於係形成以使内管20相對於外 管10偏心之方式配置内管20之外周面20A、與外管1 〇之 内周面10A之距離較短之第1區域22的簡單構造，因此可 容易且低成本地形成穩定之火焰F並予以保持。 又，使用多孔質管提高氣體供應壓力時，火培會到達 外管而無法保持’而且可能無法充分地確保燃燒過氣體之 ❹ 排氣路徑’但是於本實施形態中，可在與第1區域22相反 之區域（第2區域）相對向之燃燒空間30中確保充分之排氣 路徑。 又，於本實施形態中，停滯點S係形成在外管1〇之内 周面10A上’火焰F亦沿著内周面10A上被保持，不像管 狀火焰離開外管10而形成之情形難以導出熱量，故可提高 經由外管10進行之加熱效率。 (第2實施形態） 320996 14 200940907 • 以下，參照第2圖說明燃燒加熱器1之第2實施形態。 於圖中，與第1圖所示之第〗實施形態之構成構件相 - 同之構件則附上同一符號並省略其說明。 ， 第2實施形態舆上述第1實施形態不同之點 ，在於除 了孔部24之外，另設用以降低氣體壓力耗損之第2孔部。 第2A圖為自第1區域22側觀看内管2〇之平面圖，第 2B圖為配設有此内管20之燃燒加熱器丨之側面剖面圖。 如第2A圖所示，在内管2G之管壁，财位於第i區 域22之孔部24，同時在沿第1區域之方向與孔部24 交互地设有位於夹住第1區域22之兩侧的第2孔部25。 自此等第2孔部25，係如第2B圖所示，朝離開停滯 點S之位置喷出燃燒氣體G。 又，第2孔部25係設在從停滯點s所形成火培ρ可穩 定移火至第2孔部25所喷出之燃燒用氣體g之位置。 其他構成如在内管20之外周面20A設有輻射促進層 〇 20B ’在外管10之内周面10A設有輻射促進層1〇B，皆與 上述第1實施形態相同。 於上述構成之燃燒加熱器1中，除了可獲得與上述第 1實施形態相同之作用、效果之外，亦可使在停滯點S所 形成並保持之火焰F，移火至從第2孔部25所噴出之燃燒 用氣體G ’且可容易地在加大流量之狀態下燃燒氣體。因 此，於本實施形態中，不致如使用多孔質體時產生壓力耗 損。又’為了增加流望：無需加長内管2〇與外管丨〇，即可 增加投入熱量。結果，可防止如加長内管20與外管1〇時 320996 15 200940907 之機器大型化，同時可抑制壓力耗損，因此即使在低壓之 都市氣管中亦可使用。 又，於本實施形態中，孔部24與第2孔部25係沿第 1區域22交互地配置，且第2孔部25係配置在夾住第1 區域22之兩側，因此火焰F之形成與保持及火焰之移火皆 可在大致等分布且穩定之狀態下進行。 (第3實施形態） 以下，參照第3圖說明燃燒加熱器1之第3實施形態。 於此圖中，與第1圖所示之第1實施形態之構成構件 相同之構件則附上同一符號而省略其說明。 第3實施形態與上述第1實施形態不同之點為在内管 之前端設置支撑板。 如第3A圖所示，在比内管20之孔部24更前端側，沿 著與軸方向正交之方向設有由耐熱金屬等所形成之支撑板 (支撑構件）40。此支撑板40係如第3B圖所示，在貫穿孔 40A嵌合固定於内管20之外周面20A，而在外周面40B對 外管10之内周面10A朝轴方向支撑成移動自如。 亦即，支撑板40係與内管20構成為一體，而具有可 封閉整個燃燒空間之大小，並設成對外管朝軸方向移動自 如。 其他構成如在内管20之外周面20A設有輻射促進層 20B，在外管10之内周面10A設有輻射促進層10B，皆與 上述第1實施形態相同。（但是，於第3A圖之部分放大圖 及第3B圖中，則省略輻射促進層10B、20B之圖示）。 16 320996 200940907 於上述構成之燃燒加熱器1中， t ❹ 第1實施形態之作用•效果之外，除了可獲得如同上述 式支撑之内管20之前端側係由支由於在基端側以懸臂方 内管20之外周面20A(即第丨區板40所支撑，故可將 面10A間之間隔保持為固定。X 22)、與外管10之内周 2〇之溫度差，當高溫之内管2(^起因於外管1 〇與内管 體構成之支撑板40會與外管1〇“、、'騰時，與内管20成一 對移動，而可防止發生變升/或《^内周* 1〇A朝軸方向相 又’自位於最前端之孔部 與相對向之外管1〇之内周面出之燃燒用氣體G，係 〇 之内周面10A上形成停滞點s，〇lt突，而在每一孔部24 内周面A而分歧，但由於以* # 乂此停滞點S為境界沿著 對向之燃燒空間3〇予以封閉，板40將與第1區域22相 燃繞用氣體G係在與支撑板4〇衝^朝支撑板而分歧之 22相反侧（第2區域23)相對向之^皮引導至與第1區域 由保持在停滯點S之火焰，使周…、繞空間30。因此，藉 火。 σ之燃燒用氣體G易於點 再者，於本實施形態中，燃繞办 區劃’因此可避免燃燒用氣體G徵:係由支撑板40 之前端部而成為未燃燒狀態而產生Γ毫留在較低溫之外管μ χ，於上述實施形態中，支撑構° 被40之構成，但ϋ不受限於此，^係使用板狀之支撑 1〇之内周面m朝軸方向支撐可白y例如由在外管 此飧狀構件與内管2〇之棒狀 y德構件、及 , 午所構成之支撑構件。 320996 17 200940907 (第4實施形態） 以下參照第4圖說明上述第3實施形態之變化例之第 4實施形態。 於此圖中，與第3圖所示之第3實施形態之構成構件 相同之構件則附上同一符號而省略其說明。 如第4圖所示，於本實施形態之内管20之外周面20A， 於比支撑板40更靠近基端側之位置夾住與孔部24對應之 停滯點S之孔部24之排列方向兩側分別裝設有支撑板41。 此支撑板41係設成可封閉與第1區域22相對向之燃燒空 間30之大小。具體而言，各支撑板41係為了使自孔部24 喷出之燃燒用氣體G流向相反邊之燃燒空間30而可自排氣 管11排出，並非如支撑板40將整個燃燒空間30封閉，而 是僅封閉第1區域22周邊之燃燒空間30。又，各支撑板 41係為了能保持内管20相對於外管10之位置，僅在内管 20之管壁至第1區域22之周邊向外管10突出，且由内周 面10 A所支撑，例如形成為扇形狀。 其他構成如在内管20之外周面20A設有輻射促進層 20B，在外管10之内周面10A設有輻射促進層10B，皆與 上述第3實施形態相同。 於上述構成之燃燒加熱器1中，除了可獲得如同上述 第3實施形態之作用•效果之外，自各孔部24喷出之燃燒 用氣體G與支撑板41衝突後，分別被引導至與第1區域 22相反側（第2區域）相對向之燃燒空間30。因此，藉由保 持在停滯點S之火焰，易於更有效地使周邊之燃燒用氣體 18 320996 200940907 G點火。 (苐5實施形態） 著一、、第5圖垅明燃燒加熱器1之第5實施形態 第5圖為外管1〇與内管20之示意圖。Thus, the present invention can prevent the end of the inner tube and the stagnation point forming member from being shaken, so that the interval between the outer peripheral surface of the inner tube and the stagnation point forming member on the proximal end side and the front end side and the inner peripheral surface of the outer tube becomes not The distance between the hole portion and the stagnation point forming member and the inner peripheral surface of the outer tube can be kept constant. Therefore, the stagnation point can continue to be stably formed, and as a result, the flame can be stabilized and continue to be formed and maintained. Further, the present invention is preferably configured such that the support member disposed on the front end side of the hole portion located at the foremost end is configured to close the entire combustion space 8 320996 200940907 -. Thus, the present invention can avoid the problem that carbon monoxide is generated in the unburned state of the tube "front end portion" when the combustion gas is retained at a low temperature. The support plate is preferably configured to be relatively movable in the axial direction with respect to the outer tube. Therefore, in the present invention, even if the temperature difference between the outer tube and the inner tube is large, especially when the thermal expansion amount in the axial direction is greatly different, the support plate is not displaced due to the relative movement of the support plate to the outer tube. The interval between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube can be maintained. Further, in the present invention, it is preferable to adopt a configuration in which the second hole portion is provided, and the second hole portion discharges the combustion gas at a position where the inner tube is separated from the stagnation point. Thus, in the present invention, the flame formed and held at the stagnation point can be transferred to the combustion gas ejected from the second hole portion. Therefore, pressure loss such as when a porous body is used does not occur in the present invention. Further, it is possible to increase the amount of input heat without lengthening the inner tube and the outer tube, so that it is possible to avoid an increase in the size of the machine when the inner tube and the outer tube are lengthened. On the other hand, the present invention can also be used in a low-pressure urban air pipe because it can suppress pressure loss. The second hole portion is preferably configured to be disposed on both sides of the first region, and to be disposed between the first region and the hole portion, or to be placed between the hole and the parent. The stagnation point forms a configuration on which both sides of the opposing portion of the member are opposed to each other while being disposed in the direction of the opposing region. Thus, the present invention allows the formation, maintenance, and flame transfer of the flame to be distributed such as 320996 9 200940907. The supply path is closed on the front end side. Thus, the present invention can realize a small and inexpensive two-body capable of discharging exhaust gas from the base end side while being practical (the effect of the invention) -'*, and in a fired state. Excessive high temperature of the inner tube can be suppressed. The combustion heater according to the present invention can also increase the heating efficiency. [Embodiment] Two: , ?, and Figs. 1 to 8 illustrate the burning of the present invention and the crying of the crying == In the following descriptions, in order to identify each of the components, the scale of each component is determined. (First Embodiment) Front cross section Fig. 1 is a view showing a combustion heater of the first embodiment, and a first ? view is a side sectional view thereof. The schematic configuration of the combustion heater 1 is composed of the following members: the outer tube 10 is a heat-resistant metal heat-dissipating tube that closes the front end, and the heat-resistant gold inner tube 20 is on the left side of the base end. The support and the section are supported by the cantilever and disposed inside the outer tube 1G, and have a supply path of the combustion gas G therein. · 'Combustion gas G can use premixed fuel and air gas, or pre-fuel and oxygen-containing gas, fuel can be used in Jiayuan or Chongxuan. Further, liquid fuel can be used as long as it has a pre-evaporated portion. The outer tube 10 is formed into a bottomed cylindrical shape having a closed front end, and is connected to the base end side 320996 200940907. An exhaust pipe 11 for discharging the burned gas is connected. Further, a radiation-promoting layer (radiation-promoting surface) - 10B for promoting radiation is formed on the inner peripheral surface 10A of the outer tube 10. This radiation promoting surface 10B is left to be described later. The inner tube 20 has a bottomed cylindrical shape like a closed end, and a premixed gas supply mechanism (not shown) for supplying the combustion gas G is connected to the proximal end side, for example, an air excess ratio of about 1 is supplied. 0至六六的预混混合。 The total premixed gas from 0 to 1.6. I The inner tube 20 is disposed eccentrically on the inner side of the outer tube 10 at the distal end side, and a combustion space 30 is formed between the outer peripheral surface 20A and the inner peripheral surface 10A of the outer tube 10. In the outer peripheral surface 20A of the inner tube 20 opposed to the combustion space 30, as the radiation-promoting layer 10B described above, a radiation-promoting layer (radiation-promoting surface) 20B for promoting radiation is formed. The radiation-promoting layer 1 OB, 20B is formed, for example, by using a ceramic-adhesive adhesive to cover the inner circumferential surface 10A and the outer circumferential surface 20A by spraying. This cover layer is, for example, a heat resistant temperature of about 800 ° C. Further, by forming the radiation-promoting layers 10B and 20B by sputtering, high adhesion and long life can be achieved. The outer circumferential surface 20A of the inner tube 20 has a first region 22 having the shortest distance from the inner circumferential surface 10A of the outer tube 10 and a second region 23 longer than the first region 22. More specifically, among the outer peripheral surface 20A, the inner peripheral surface 10A of the outer tube 10 is formed along the axial direction in the eccentric direction of the inner tube 20 (see FIG. 1B in the middle of the first drawing). The distance is the shortest first region (bus bar) 22, and the other region is formed with the second region 23 which is longer than the first region 22 from the inner peripheral surface 10A. 11 320996 200940907 Here, the first region 22 is located on the front end side of the inner tube 2〇, and a plurality of (here, five) holes are formed along the tube wall along the diametrical direction along the first region 22. twenty four. An ignition device (not shown) is provided in the vicinity of the position of the outer tube 1Q facing the hole portion 24. Further, the outer peripheral surface 2GA' is disposed closer to the base end side (the left side in FIG. j) than the region in which the hole portion 24 is formed, and the combustion gas g is supplied to the supply path 21 by the burned gas (flame). Preheating zone p for preheating. Next, the combustion operation of the above-described combustion heater 1 will be described. The combustion gas G' supplied from the premixed gas supply means to the supply path 21 of the inner tube 20 is ejected from the hole portion 24 to the inner peripheral surface i?a of the outer f1Q. Here, since the hole portion 24 is formed in the first region 22 in which the distance from the inner circumferential surface 1A of the outer tube 1 is the shortest, the combustion gas g discharged from the hole portion 24 and the opposite outer tube 10 are formed. The inner peripheral surface 1〇A collides, and a stagnation point s is formed on the inner circumferential surface i〇A of each of the hole portions 24, and the stagnation point s is the boundary and is divided along the inner circumferential surface 10A. Then, the combustion gas in the vicinity of the stagnation point s is ignited by the ignition device to form a flame. Further, the combustion gas G which is different in the vicinity of the stagnation point s flows into the combustion space on the side opposite to the first region 22 having a large cross-sectional area from the vicinity of the i-th region 22 having a small cross-sectional area, as shown in FIG. 1B. A flame ρ is formed on both sides of the tube 2 夹 within the combustion space 30. At this time, since the gas flow rate at the stagnation point S is zero, and the circulation flow formed around the jet flow to the stagnation point s, the formed flame is stably maintained. 320996 12 200940907 • Further, the combustion gas is discharged from the exhaust pipe through the combustion space 30, but in the middle of the combustion space 30 to the exhaust pipe 11, the preheating zone P of the inner pipe 2 passes through the inner pipe The wall of 2G is heat exchanged with the gas for combustion (unburned gas). Since the combustion gas G in the supply path 21 is ejected from the hole portion 24 in a state of being preheated by the high temperature, the stability of the flame F is increased, and even if it is ejected to the narrow combustion space 30, it does not occur. The unburned crotch portion θ is divided and can be stably burned. Further, since the heat generated by the combustion gas and the heat generated by the flame F particularly cause the inner tube 20 to have a high temperature, since the radiation promoting layer 20B is provided on the outer surface 2A of the inner tube 20, the heat of the inner tube 20 is The rate of emissivity increases to promote radiation (radiation) as radiant heat. On the other hand, the radiation promoting layer 10B is also provided on the inner peripheral surface 10A of the outer tube, so that the radiant heat from the inner tube 20 and the radiant heat of the flame f can be promoted. As described above, in the present embodiment, the radiation ❹ promoting layer 20B included in the inner tube 2 , causes the heat of the inner tube 20 to promote radiation as radiant heat. Therefore, excessive temperature increase of the inner tube 20 can be suppressed, and even if the radiation capacity is lowered at a low temperature, most of the heat of the inner tube 20 can be utilized for heating (preheating) of the internal combustion gas G, and Heating characteristics can be maintained. Therefore, the preheating temperature for the combustion gas G can also be adjusted by adjusting the structure (material, thickness, distribution, etc.) of the radiation-promoting layer 20B. Further, the outer tube 1 加热 can be heated by the radiant heat to improve the heating efficiency via the outer tube 1 。. In particular, in the present embodiment, since the radiation promoting layer 1〇β is also provided on the inner circumferential surface 10A of the outer tube 10, the heat of the outer tube 13 320996 200940907 10 can be effectively increased. The heating efficiency of the tube. Further, in the present embodiment, since the combustion gas G' is ejected from the hole portion 24 formed in the pipe wall of the inner pipe 20 and the flame F is held at the stagnation point S, the situation is increased as compared with the case where the porous pipe is provided. Even if the flow rate is changed, a stable flame F can be easily formed. Further, in the present embodiment, in order to increase the amount of combustion, only the number of the holes 24 may be increased. Therefore, the number of components is small, the structure is simple, and the manufacturing cost of the combustion heater 1 can be reduced, and unlike the case of using a porous pipe, it is not necessary to greatly increase the supply pressure of the combustion gas G ' even in a low-pressure urban gas pipe. Can be fully applied. In the present embodiment, the distance between the outer circumferential surface 20A of the inner tube 20 and the inner circumferential surface 10A of the outer tube 1 is short because the inner tube 20 is eccentric with respect to the outer tube 10. The simple configuration of the region 22 makes it possible to form and maintain a stable flame F easily and at low cost. Further, when the gas supply pressure is increased by using the porous pipe, the fire train reaches the outer pipe and cannot be maintained 'and the exhaust gas path may not be sufficiently ensured to burn the gas. However, in the present embodiment, it is possible to be in the first region. The opposite region (the second region) 22 ensures a sufficient exhaust path relative to the combustion space 30. Further, in the present embodiment, the stagnation point S is formed on the inner circumferential surface 10A of the outer tube 1A. The flame F is also held along the inner circumferential surface 10A, and it is difficult to form the tubular flame away from the outer tube 10. Since the heat is extracted, the heating efficiency via the outer tube 10 can be improved. (Second Embodiment) 320996 14 200940907 • Hereinafter, a second embodiment of the combustion heater 1 will be described with reference to Fig. 2 . In the drawings, the same components as those of the first embodiment shown in Fig. 1 are denoted by the same reference numerals, and their description will be omitted. The second embodiment differs from the first embodiment in that a second hole portion for reducing the gas pressure loss is provided in addition to the hole portion 24. Fig. 2A is a plan view of the inner tube 2A viewed from the side of the first region 22, and Fig. 2B is a side sectional view of the combustion heater 配 provided with the inner tube 20. As shown in FIG. 2A, the wall of the inner tube 2G is located in the hole portion 24 of the i-th region 22, and is disposed to sandwich the first region 22 in interaction with the hole portion 24 in the direction of the first region. The second hole portion 25 on both sides. From the second hole portion 25, as shown in Fig. 2B, the combustion gas G is discharged toward the position away from the stagnation point S. Further, the second hole portion 25 is provided at a position where the fire pups formed from the stagnation point s are stably ignited to the position of the combustion gas g ejected from the second hole portion 25. In the other configuration, the radiation promoting layer 〇 20B is provided on the outer circumferential surface 20A of the inner tube 20, and the radiation promoting layer 1B is provided on the inner circumferential surface 10A of the outer tube 10, which is the same as the first embodiment. In the combustion heater 1 having the above-described configuration, in addition to the same effects and effects as those of the above-described first embodiment, the flame F formed and held at the stagnation point S can be transferred to the second hole portion. The combustion gas G' ejected by 25 is easily burned in a state of increasing the flow rate. Therefore, in the present embodiment, pressure loss does not occur when a porous body is used. In addition, in order to increase the flow of electricity: it is possible to increase the heat input without lengthening the inner tube 2〇 and the outer tube. As a result, it is possible to prevent the size of the machine such as the extension of the inner tube 20 and the outer tube 1 320996 15 200940907, and at the same time suppress the pressure loss, so that it can be used even in a low-pressure urban air pipe. Further, in the present embodiment, the hole portion 24 and the second hole portion 25 are alternately arranged along the first region 22, and the second hole portion 25 is disposed on both sides of the first region 22, so that the flame F Both formation and maintenance and flame transfer can be carried out in a substantially equi-distributed and stable state. (Third Embodiment) Hereinafter, a third embodiment of the combustion heater 1 will be described with reference to Fig. 3 . In the drawings, the same members as those of the first embodiment shown in Fig. 1 are denoted by the same reference numerals and will not be described. The third embodiment differs from the above-described first embodiment in that a support plate is provided at the front end of the inner tube. As shown in Fig. 3A, a support plate (support member) 40 made of a heat resistant metal or the like is provided on the front end side of the hole portion 24 of the inner tube 20 in a direction orthogonal to the axial direction. As shown in Fig. 3B, the support plate 40 is fitted and fixed to the outer circumferential surface 20A of the inner tube 20 in the through hole 40A, and is movably supported in the axial direction on the inner circumferential surface 10A of the outer tube 10 on the outer circumferential surface 40B. That is, the support plate 40 is integrally formed with the inner tube 20, and has a size that can close the entire combustion space, and is configured to move the outer tube in the axial direction. In the other configuration, the radiation promoting layer 20B is provided on the outer peripheral surface 20A of the inner tube 20, and the radiation promoting layer 10B is provided on the inner peripheral surface 10A of the outer tube 10, which is the same as the first embodiment. (However, in the partial enlarged view of Fig. 3A and Fig. 3B, the illustration of the radiation promoting layers 10B, 20B is omitted). 16 320996 200940907 In the combustion heater 1 having the above configuration, in addition to the action and effect of the first embodiment, in addition to the inner tube 20 which is supported as described above, the front end side is supported by the branch due to the cantilever on the base end side. The outer circumferential surface 20A of the inner tube 20 (i.e., the second plate 40 is supported, so that the interval between the faces 10A can be kept constant. X 22), and the temperature difference between the inner circumference and the outer circumference of the outer tube 10 is high. The inner tube 2 (^ is caused by the outer tube 1 〇 and the inner tube body of the support plate 40 and the outer tube 1 〇 "," tempo, and the inner tube 20 in a pair of movement, and can prevent the rise or / or " ^Inner circumference* 1〇A in the direction of the axis, and the combustion gas G from the innermost end portion and the inner circumferential surface of the outer tube 1〇, forming a stagnation point on the inner circumferential surface 10A of the crucible s, 〇 突 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The region 22 phase combustion gas G is guided to the first region opposite to the opposite side of the support plate 4 from the support plate 22 (the second region 23). From the flame held at the stagnation point S, the circumference ... is around the space 30. Therefore, by the fire, the combustion gas G of σ is easy to be reappeared, and in the present embodiment, the combustion is divided into divisions, so that the combustion gas can be avoided. G sign: the tube is left in the unburned state by the front end portion of the support plate 40, and the tube is left at a lower temperature. In the above embodiment, the support structure is 40, but the enthalpy is not limited. Therefore, the inner peripheral surface m of the plate-like support 1 is supported in the axial direction, and the white y can be supported by, for example, a rod-shaped y-d member in the outer tube and the inner tube 2, and a support made of noon. (Fourth Embodiment) A fourth embodiment of a modification of the third embodiment will be described below with reference to Fig. 4. In this figure, the constituent members of the third embodiment shown in Fig. 3 are described. The same components are denoted by the same reference numerals, and the description thereof is omitted. As shown in Fig. 4, the outer circumferential surface 20A of the inner tube 20 of the present embodiment is sandwiched between the hole portion and the proximal end side of the support plate 40. 24 corresponding to the stagnation point S of the hole portion 24 is arranged on both sides of the arrangement direction The support plate 41 is sized to close the combustion space 30 opposed to the first region 22. Specifically, each of the support plates 41 flows in order to flow the combustion gas G ejected from the hole portion 24 to the opposite side. The side combustion space 30 can be discharged from the exhaust pipe 11, and instead of closing the entire combustion space 30 as the support plate 40, only the combustion space 30 around the first region 22 is closed. Further, each support plate 41 is kept in order to maintain The position of the inner tube 20 with respect to the outer tube 10 protrudes only from the tube wall of the inner tube 20 to the periphery of the first region 22 to the outer tube 10, and is supported by the inner peripheral surface 10A, for example, in a fan shape. In the other configuration, the radiation promoting layer 20B is provided on the outer peripheral surface 20A of the inner tube 20, and the radiation promoting layer 10B is provided on the inner peripheral surface 10A of the outer tube 10, which is the same as the third embodiment. In the combustion heater 1 having the above-described configuration, in addition to the effects and effects of the third embodiment, the combustion gas G discharged from each of the holes 24 collides with the support plate 41, and is guided to the first The opposite side (the second area) of the region 22 is opposed to the combustion space 30. Therefore, by maintaining the flame at the stagnation point S, it is easy to more efficiently ignite the surrounding combustion gas 18 320996 200940907 G. (苐5 embodiment) First and fifth embodiments show a fifth embodiment of the combustion heater 1. Fig. 5 is a schematic view showing the outer tube 1〇 and the inner tube 20.
m Η圖所7^ ’於本實施形態之燃燒加熱11 1中，内 官20在外管^之燃燒空間3〇，在外管1〇之中心抽周邊 朝周方向隔著間隔，且分別盘 刀另J與外s 10偏心而配置多數個 (於第5圖中，為以6〇。間隔配置“固）。 在各㈣2G ’朝轴方向隔著間隔形成多數個孔部 5圖中未圖示），該孔部24係位於 管10之内周面m為最短距離之W區域22。 …卜 其他構成如在内管2G之外周面雇設有輻射促進層 、〃外^ 10之内周面10A設有輻射促進層10B，皆與 上述弟1實施形態相同。 - 於上述構成之燃燒加熱器i中，自設有多數個内管20 ©(之孔部）分別嘴出燃燒用氣體G，使外管10之内周面⑽ 上形成停滞點，而使職職體6點火，藉此在沿外管10 之内周面之軸周邊形成多數穩定之火焰。 A /所以，於本實施形態中，除了可獲得如同上述第1實 施形態之作用與效果，亦可將外管10加熱至更高溫。、 (第6實施形態） 繼之，參照第6圖說明燃燒加熱器i之第6實施形綠。 於第6圖中，與第！圖所示之第i實施形態之構成構 件相Π之構件，則附上相同符號而省略其說明。 320996 19 200940907 於上述第1至第5實施形態中，雖皆為將停滯點s形 成在外.管10之内周面〗〇4上之構成，但是於此第6實施形 態中，則說明形成於鈍體（biuffb〇dy)(停滯點與循環流形 成構件）之表面之情形。 如第6A圖所示，本實施形態之燃燒加熱器丨，係由未 圖示之支撐手段以懸臂方式支撑在基端側（第圖之左側） 而配設在外管10㈣之騎空間3Q，在其㈣具有：具 備燃燒用氣體G之供應路徑21之多數個耐熱金屬製之内管 20、及鈍體（停滯點與循環流形成構件）5{)。 内管20係如第6β圖所示，在外管1〇之中心軸周邊， 互相隔著，RI而配置多數個（在此為以6G。間隔配置請）。 各内管20係在前端方與鈍體5〇相對向之外管1〇之中 :軸之位置，沿著軸方向互相隔著間隔而朝直徑方向貫穿 g壁开> 成多數個（在此為5個）孔部％。 鈍體50係配置成使其軸線與外管10之中心轴上一 致並使周圍由内官2〇所包圍，在與各内^ 2〇(孔部⑷ 相對向之位置，沿軸方向形成有在时20之 之凹曲面50A。In the combustion heating 11 1 of the present embodiment, the interior of the inner tube 20 is 3 〇 in the combustion space of the outer tube, and the periphery of the outer tube 1 抽 is spaced apart in the circumferential direction, and the disc cutters are respectively J and the outer s 10 are eccentrically arranged in a plurality (in the fifth figure, the arrangement is "6". The interval is "solid". In each of the (four) 2G's axial direction, a plurality of holes are formed at intervals, not shown in the figure) The hole portion 24 is located in the W region 22 where the inner circumferential surface m of the tube 10 is the shortest distance. The other configuration is such that the outer peripheral surface of the inner tube 2G is provided with a radiation-promoting layer, and the inner circumferential surface 10A of the outer surface 10 The radiation-promoting layer 10B is provided in the same manner as the above-described first embodiment. - In the combustion heater i having the above configuration, a plurality of inner tubes 20 (hole portions) are provided with the combustion gas G, respectively. A stagnation point is formed on the inner peripheral surface (10) of the outer tube 10, and the professional body 6 is ignited, thereby forming a plurality of stable flames around the axis of the inner peripheral surface of the outer tube 10. A / Therefore, in the present embodiment In addition to the effects and effects of the first embodiment described above, the outer tube 10 can be heated to a higher temperature. (6th Next, the sixth embodiment of the combustion heater i will be described with reference to Fig. 6. In Fig. 6, the member corresponding to the constituent member of the i-th embodiment shown in Fig. is attached. The same reference numerals are omitted, and the description thereof is omitted. 320996 19 200940907 In the first to fifth embodiments described above, the stagnation point s is formed on the inner circumferential surface of the tube 10, but the sixth embodiment is implemented. In the form, the surface of the bluff body (the stagnation point and the circulation flow forming member) is formed. As shown in Fig. 6A, the combustion heater 本 of the embodiment is not shown. The support means is supported on the base end side (the left side of the figure) in a cantilever manner, and is disposed in the riding space 3Q of the outer tube 10 (four), and has (4) a plurality of inner tubes made of heat-resistant metal having the supply path 21 for the combustion gas G 20, and bluff body (stagnation point and circulation flow forming member) 5{). The inner tube 20 is arranged around the central axis of the outer tube 1〇 as shown in the sixth β-picture, and a plurality of RIs are arranged (here Please arrange at 6G. Interval.) Each inner tube 20 is at the front end and the bluff body. In the outer tube 1〇, the position of the shaft is opened in the diameter direction along the axial direction, and the number of holes is increased by a large number in the diameter direction. It is arranged such that its axis coincides with the central axis of the outer tube 10 and the periphery is surrounded by the inner 2 〇, and at the position opposite to the inner hole (4), the time is formed along the axial direction. The concave curved surface 50A.
雇其在他外構内管20之外周面咖設有輕射促進層 在卜吕10之内周面10A設有輻射促進層ι〇Β，皆I 二述第1貫施形態相同(但是於第6B圖與第6c圖中省略輻 射促進層10B、20B之圖示）。 於上述構成之燃燒加熱器 21所供應之燃燒用氣體G係如 1中，内管2〇 第6C圖所示， 之供應路徑 分別自孔部 320996 20 200940907 - 24向鈍體50之凹曲面50A喷出。 自孔部24噴出之燃燒用氣體G係與相對向之鈍體50 • 之凹曲面50A衝突，在每一孔部24之凹曲面50A上形成停 . 滯點S，以此停滯點S為境界沿凹曲面50A分歧。 再者，藉由點火裝置對停滯點S附近之燃燒用氣體G 點火而在停滯點S形成火焰並予以保持。此時，因在停滯 點S之氣體流速為零，因此藉由形成於向停滯點S之噴流 周圍的循環流而形成之火焰係穩定地保持在停滞點S。 Ο 如此，在停滞點S分歧之燃燒用氣體G係自氣體壓力 高之鈍體50附近，流向相對於内管20與鈍體50相反侧之 外管10之内周面10A的燃燒空間30。 而且，燃燒氣體雖係流經燃燒空間30而由排氣管11 排出，但是在燃燒空間30至排氣管11之途中，在内管20 之預熱區域P經由内管20之管壁進行與燃燒用氣體（未燃 燒氣體）G之熱交換。 ❹ 由此，於供應路徑21之燃燒用氣體G係在預熱成高溫 之狀態下自孔部24喷出，火焰F之穩定性增加，即使喷出 至狹窄之燃燒空間30亦不產生不燃燒部分而可穩定地燃 燒。 如此於本實施形態中，自形成於内管20管壁之孔部 24向鈍體50之凹曲面50A噴出燃燒用氣體G，而在停滯點 S保持火焰F，因此不會像裝設多孔質管之情形時增加成 本，即使改變流量時也易於形成穩定之火焰F並予以保 持。此外，於本實施形態中，為了增加燃燒量，只要增加 21 320996 200940907 孔部24之數量即可。因此構成零件少，構造亦簡單，而可 降低燃燒加熱器1之製造成本’而且不像使用多孔質管之 情形，無需大幅提高燃燒用氣體G之供應壓力’即使在低 壓之都市氣管中亦可充分地適用° 又，因在各内管20之外周面没有輻射促進層20B’ 在外管10之内周面10A設有輻射促進層10β ’因此可使燃 燒空間別之熱可有效地吸收在外管10，可更提高經由外 管10進行之加熱效率。 (第7實施形態） 繼之，參照第7圖說明燃燒加熱器1之第7實施形態。 於此圖中，與第7圖所示之第6實施形態之構成構件 相同之構件即附上同一符號而省略其說明。 第7實施形態與上述第6實施形態不同之點為在外管 10之中心軸上配置與内管20相同之圓管。 亦即’如第7C圖所示之部分放大圖’於本實施形態 中，使外管10之中心轴與轴線一致，且與内管20隔著間 隔而配置内管（停滞點形成構件）120。内管120為形成前端 被封閉之有底圓筒形狀，在基端側連接有供應燃燒用氣體 G至内部之供給路徑121之預混合氣供應機構（未圖示）。 又，在内管120之外周面120Α，設有與上述輻射促進層20Β 相同之輻射促進層120Β。 又’内管120係分別在與配置於周圍之各管路2〇相對 向之位置形成有喷出燃焼用氣體G之孔部124。此孔部124 係如第7D圖所示，有關軸方向，係相對於各内管2〇形成 320996 22 200940907 在不與孔部24相對向而與外周面12〇A相對向之位置。 即’内管20之孔部24亦不與内f 12〇之孔部124相 而與外周面120A相對向。 ° 其他構成如在内管20之外周面設有輕射促進層 ，在外管10之内周面10A設有輻射促進層1〇B，皆盘 上述第6實施形態相同（但是，於第7B圖 :隹 層10B，、聽之圖示）。 射促進 ❹ =上述構成之燃燒加熱器i巾，由預混合氣 供應至内管20之供應路徑21之燃燒用氣體G，係分= 孔《卩24向内管12〇之外周面12〇A喷出。在此外周面“Μ 形成有燃燒職體G之停滯點s，燃燒用氣體G係在 點S分歧而沿外周面120A流動。 哪 广另一方面，供應至内管120之供應路徑121之燃燒用 氣體G，係分別自孔部124向内管20之外周面20Α噴出。 於此外周面2〇Α形成有燃燒用-氣體G之停滯點s，燃燒用 ❹氣體G係在停滞點S分歧而沿外周面120A流動。亦即於本 實施形態中，不僅是内管12〇，内管2〇也作為停滯點形 構件發揮作用。 & 再者，藉由對停滯點S附近之燃燒用氣體g點火，在 停滯點s形成火㉒並予以保持。此時，於停滯點s之氣體 μ速為零因此所形成之火焰係穩定地保持在停滯點$。 而且’在停滯點S分歧之燃燒用氣體G係流動在氣體 壓力相對低之外管1 〇之内周面1 側的燃燒空間如] 燒過之氣體係從排氣管11排出。 '' 320996 23 200940907 如此，於本實施形態中，除了可獲得如同上述第6 施形態之作用與效果之外，因自内管12G亦噴_燒用氣 體G，而可更有效地進行加熱。而且，在配置於周圍之内 管20之外周面20A也形成有停滯點8而形成火焰並予以保 持’因此可更加廣範圍形成穩定之火焰並予以保持。’、 再者，内管20之孔部24與内管12〇之孔部124，亦 可設置在相對向之位置’但為了穩定地形成停滯點S，較 佳為相互設置在與外周面12〇A、2〇A相對向之位置。 (第8實施形態） 繼之，參照第8圖說明燃燒加熱器i之第8實施形態。 於此圖中’與第6圖所示之第6實施形態之構成構件 相同之構件即附上同一符號而省略其說明。 如第8β圖所示，於本實施形態中，在外管1之中心轴 =設内管’而在中心軸周圍之周方向互相隔著間隔設多 數個（在此為以60。間隔設置6個）内管2〇。 ^管20係如第8C圖之部分放大圖所示，在與相鄰 s 20相對向之位置分別設有喷出燃燒用氣體Q之孔部 :於孔部24之軸方向位置，則如同第7實施形態，差 *妒出之燃燒用氣體G與相鄰之内管20之外周面20A種 ^交f為配置成如第7D圖之部分放大圖所示，相鄰之内 官20彼此交又為佳。 ，其在 之外周面咖射促進層 周面10A设有輻射促進層10B，皆與 320996 24 200940907 '上述第6實施形態相同（但是，於第8B圖中省略輻射促進 層10B、20B之圖示）。 ^上述構成之燃燒加熱器丨中，除了可獲得如同上述 .第6實施形態之作用與效果之外，因停滞點s與火焰是形 成在更接近作為散熱管之外管10之位置，因此易於經由外 管10導出熱，而可提高加熱效率。 以上，參照附圖說明本發明之理想實施形態，但是本 ❹發明並不限於所列舉之例。於上述例中所示之各構成構件 之諸形狀或組合等僅為一例，在不脱離本發明之主旨的範 圍内，可根據設計要求等進行各種變更。 例如，於上述第2實施形態中，雖說明除了孔部24之 外亦設置苐2孔部25之構成，但是不受限於此，例如在第 3實施形態至第8實施形態所示之内管2〇，亦可為除了孔 部24之外亦設置第2孔部之構成。 同樣地，於上述第3實施形態中，雖為於内管2〇之前 ❹端側設置支撑板40之構成，但是在第4實施形態至第8實 施形態中，也可將前端侧作為用以支撐支撑板之構成，而 可發揮如同第3實施形態之作用與效果。 又，於上述實施形態中，均為内管2〇相對於外管 偏心配置，藉此成為形成有外周面2〇a相對於外管1〇之内 周面10A為最短距離之第1區域22之構成，但是並不受限 於此’亦可為同心配置之構成。 又，於上述實施形態中，雖說明在内管2〇之外周面 20A及外管10之内周面10A雙方裝設輻射促進層之構成， 320996 25 200940907 但是並不受限於此，亦可為僅在内管20之外周面2〇A震設 輻射促進層之構成。 再者’於上述實施形態中係說明以輻射促進層1〇β、 20B(120B)形成輕射促進面之構成，但是除此之外，例如以 形成輻射促進層10B、20B，20B之材料構成外管10及内管 20、120 ’且内周面ι〇Α、外周面2〇A、120A本身具有輻射 促進特性之構成亦可。 又’於上述實施形態中，雖皆為内管2〇相對於外管 10偏心配置之構成，但是並不受限於此，例如第9圖所示， 將孔部24配置成放射線狀且具有轄射促進層2GB之内管 2〇’與具有輻射促進層10B之外管10配置成同心之構成亦 可。 (產業上之可利用性） 如上述之說明，根據本發明之燃燒加熱器，可抑制内 管之過度高溫化，並可提高加熱效率。 【圖式簡單說明] 第1A圖係第1實施形態之燃燒加熱器1之正面剖面 圖。 第1β圖係第1實施形態之燃燒加熱器1之侧面剖面 圖。 第2Α圖係自第J區域側觀看内管之平面圖。 第2Β圖係配彀有内管之燃燒加熱器之側面剖面圖。 第3Α圖係第3實施形態之燃燒加熱器之正面剖面圖。 第3Β圖係第3實施形態之燃燒加熱器之侧面剖面圖。 26 320996 200940907 - 第4圖係第4實施形態之燃燒加熱器之要部詳細圖。 第5圖係第5實施形態之外管與内管之示意圖。 第6A圖係第6實施形態之燃燒加熱器之正面剖面圖。 . 第6B圖係第6實施形態之燃燒加熱器之側面剖面圖。 第6C圖係第6實施形態之燃燒加熱器之要部放大圖。 第7A圖係第7實施形態之燃燒加熱器之正面剖面圖。 第7B圖係第7實施形態之燃燒加熱器之側面剖面圖。 第7C圖係第7實施形態之燃燒加熱器之要部放大圖。 ❹ 第7D圖係第7實施形態之燃燒加熱器之要部放大圖。 第8A圖係第8實施形態之燃燒加熱器之正面剖面圖。 第8B圖係第8實施形態之燃燒加熱器之側面剖面圖。 第8C圖係第8實施形態之燃燒加熱器之要部放大圖。 第9圖係内管與外管為同心配置之燃燒加熱器之要部 詳細圖。 【主要元件符號說明】 © 1 燃燒加熱器 10 外管（散熱管） 10A 内周面 10B、20B、120B輻射促進層（輻射促進面） 11 排氣管 20A、120A外周面 22 第1區域 24、124孔部 30 燃燒空間 50 鈍體 20、120内管 21 供應路徑 23 第2區域 25 第2孔部 40、41支撑板（支撑構件） 50A 凹曲面 27 320996 200940907 F 火焰 G 燃燒用氣體 P 預熱區域 S 停滯點Hire a light-emitting layer on the outer surface of the outer tube 20 of his outer structure. In the inner surface of the Bulu 10, there is a radiation-promoting layer ι〇Β, all of which are the same in the first embodiment (but in the first The illustration of the radiation-promoting layers 10B, 20B is omitted in FIGS. 6B and 6c). The combustion gas G supplied from the combustion heater 21 having the above configuration is as shown in Fig. 6C of the inner tube 2, and the supply path is from the hole portion 320996 20 200940907 - 24 to the concave curved surface 50A of the bluff body 50, respectively. ejection. The combustion gas G ejected from the hole portion 24 collides with the concave curved surface 50A facing the bluff body 50, and a stop point S is formed on the concave curved surface 50A of each hole portion 24, whereby the stagnation point S is the boundary Divided along the concave curved surface 50A. Further, the ignition gas is used to ignite the combustion gas G in the vicinity of the stagnation point S to form a flame at the stagnation point S and hold it. At this time, since the gas flow rate at the stagnation point S is zero, the flame formed by the circulation flow formed around the jet flow to the stagnation point S is stably maintained at the stagnation point S. In this way, the combustion gas G which is different at the stagnation point S flows from the vicinity of the bluff body 50 having a high gas pressure to the combustion space 30 of the inner circumferential surface 10A of the outer tube 10 on the side opposite to the inner tube 20 and the bluff body 50. Further, although the combustion gas flows through the combustion space 30 and is discharged from the exhaust pipe 11, the preheating region P of the inner pipe 20 passes through the pipe wall of the inner pipe 20 on the way from the combustion space 30 to the exhaust pipe 11. Heat exchange of combustion gas (unburned gas) G. Thereby, the combustion gas G in the supply path 21 is ejected from the hole portion 24 in a state of being preheated to a high temperature, and the stability of the flame F is increased, and no combustion is caused even if it is ejected to the narrow combustion space 30. Partially and steadily burning. As described above, in the present embodiment, the combustion gas G is ejected from the hole portion 24 formed in the pipe wall of the inner tube 20 to the concave curved surface 50A of the bluff body 50, and the flame F is held at the stagnation point S, so that the porous portion is not installed. In the case of the tube, the cost is increased, and even if the flow rate is changed, it is easy to form a stable flame F and maintain it. Further, in the present embodiment, in order to increase the amount of combustion, it is only necessary to increase the number of the holes 24 of 21 320996 200940907. Therefore, the number of components is small and the structure is simple, and the manufacturing cost of the combustion heater 1 can be reduced. Moreover, unlike the case of using a porous pipe, it is not necessary to greatly increase the supply pressure of the combustion gas G, even in a low-pressure urban gas pipe. In addition, since the radiation-promoting layer 20B' is not provided on the outer peripheral surface of each inner tube 20, the radiation-promoting layer 10β' is provided on the inner peripheral surface 10A of the outer tube 10, so that the heat of the combustion space can be efficiently absorbed in the outer tube. 10, the heating efficiency via the outer tube 10 can be further improved. (Seventh Embodiment) Next, a seventh embodiment of the combustion heater 1 will be described with reference to Fig. 7. In the drawings, the same members as those of the sixth embodiment shown in Fig. 7 are denoted by the same reference numerals, and their description is omitted. The seventh embodiment differs from the sixth embodiment in that a circular pipe similar to the inner pipe 20 is disposed on the central axis of the outer tube 10. In other words, in the present embodiment, the central axis of the outer tube 10 is aligned with the axis, and the inner tube (stagnation point forming member) is disposed at an interval from the inner tube 20. 120. The inner tube 120 has a bottomed cylindrical shape in which the front end is closed, and a premixed gas supply mechanism (not shown) for supplying the combustion gas G to the internal supply path 121 is connected to the proximal end side. Further, a radiation promoting layer 120A similar to the above-described radiation promoting layer 20A is provided on the outer peripheral surface 120 of the inner tube 120. Further, the inner tube 120 is formed with a hole portion 124 through which the combustion gas G is discharged, at a position opposed to each of the respective lines 2A disposed around the inner tube 120. The hole portion 124 is formed as shown in Fig. 7D, and the axial direction is formed with respect to each of the inner tubes 2, 320996 22 200940907 so as not to face the hole portion 24 and to face the outer peripheral surface 12A. That is, the hole portion 24 of the inner tube 20 does not face the outer peripheral surface 120A with respect to the hole portion 124 of the inner portion 12 12 . ° Other configurations include a light-emission promoting layer on the outer peripheral surface of the inner tube 20, and a radiation-promoting layer 1B on the inner peripheral surface 10A of the outer tube 10, all of which are the same as in the sixth embodiment (however, in the seventh embodiment) : 隹 layer 10B, listen to the icon). The radiation-promoting ❹ = the combustion heater i having the above-described configuration, the combustion gas G supplied from the premixed gas to the supply path 21 of the inner tube 20, the system of the hole = the hole "卩24 inward pipe 12〇 outer peripheral surface 12A" ejection. On the other hand, "the stagnation point s of the combustion body G is formed, and the combustion gas G flows at the point S and flows along the outer peripheral surface 120A. On the other hand, the combustion of the supply path 121 supplied to the inner tube 120 The gas G is ejected from the hole portion 124 to the outer peripheral surface 20 of the inner tube 20, and the stagnation point s of the combustion gas G is formed on the outer peripheral surface 2, and the helium gas G for combustion is branched at the stagnation point S. Further, in the present embodiment, not only the inner tube 12A but also the inner tube 2〇 functions as a stagnant point member. Also, by burning the vicinity of the stagnation point S The gas g is ignited, and the fire 22 is formed at the stagnation point s and held. At this time, the gas μ speed at the stagnation point s is zero, so that the formed flame is stably maintained at the stagnation point $. And 'different at the stagnation point S The combustion gas G flows in a combustion space on the inner peripheral surface 1 side of the tube 1 在, and the burned gas system is discharged from the exhaust pipe 11. '' 320996 23 200940907 Thus, in the present embodiment In addition to the role of the sixth embodiment described above, In addition, since the gas G is burned from the inner tube 12G, the heating can be performed more efficiently. Further, a stagnation point 8 is formed on the outer peripheral surface 20A of the inner tube 20 disposed around the inner tube 20 to form a flame and Keeping 'so a stable flame can be formed and maintained in a wider range.' Further, the hole portion 24 of the inner tube 20 and the hole portion 124 of the inner tube 12 can also be disposed at a relative position 'but for stable The stagnation point S is formed, and is preferably disposed at a position facing the outer peripheral surfaces 12A and 2A. (Eighth Embodiment) Next, an eighth embodiment of the combustion heater i will be described with reference to Fig. 8. In the drawings, the same members as those of the sixth embodiment shown in Fig. 6 are denoted by the same reference numerals, and their description will be omitted. As shown in Fig. 8β, in the present embodiment, at the center of the outer tube 1 The shaft = the inner tube ', and a plurality of inner tubes (here, six at intervals of 60) are disposed at intervals in the circumferential direction around the central axis. The tube 20 is partially enlarged as shown in Fig. 8C. As shown, a gas for discharging combustion Q is provided at a position opposite to the adjacent s 20 In the axial direction of the hole portion 24, as in the seventh embodiment, the combustion gas G that is different from the outer circumferential surface 20A of the adjacent inner tube 20 is arranged so as to be arranged as shown in Fig. 7D. As shown in a partially enlarged view, it is preferable that the adjacent inner 20s are in contact with each other. The radiation-promoting layer 10B is provided on the outer circumferential surface of the outer surface of the cacao-promoting layer 10A, which is the same as the sixth embodiment of the above-mentioned sixth embodiment. (However, the illustration of the radiation-promoting layers 10B and 20B is omitted in Fig. 8B.) ^ In the above-described combustion heater, the stagnation point is obtained in addition to the effects and effects of the sixth embodiment described above. The s and the flame are formed closer to the tube 10 as the heat pipe, so that it is easy to conduct heat through the outer tube 10, and the heating efficiency can be improved. The preferred embodiments of the present invention have been described above with reference to the drawings, but the invention is not limited to the examples. The shapes, combinations, and the like of the respective constituent members shown in the above examples are merely examples, and various modifications can be made according to design requirements and the like without departing from the gist of the invention. For example, in the second embodiment, the configuration in which the hole portion 25 is provided in addition to the hole portion 24 is described. However, the present invention is not limited thereto, and is, for example, as shown in the third embodiment to the eighth embodiment. The tube 2 may be configured to have a second hole portion in addition to the hole portion 24. Similarly, in the third embodiment, the support plate 40 is provided on the distal end side of the inner tube 2A. However, in the fourth embodiment to the eighth embodiment, the distal end side may be used. The structure and effect of the third embodiment can be exhibited by supporting the configuration of the support plate. Further, in the above-described embodiment, the inner tube 2 is disposed eccentrically with respect to the outer tube, whereby the first region 22 in which the outer peripheral surface 2A is formed to be the shortest distance from the inner peripheral surface 10A of the outer tube 1A is formed. The composition, but not limited to this, can also be a concentric configuration. Further, in the above-described embodiment, the radiation promoting layer is provided on both the outer circumferential surface 20A of the inner tube 2 and the inner circumferential surface 10A of the outer tube 10, and 320996 25 200940907 is not limited thereto. The radiation-promoting layer is formed only by the outer surface 2〇A of the inner tube 20. In the above embodiment, the radiation-promoting layer 1 〇β, 20B (120B) is configured to form a light-emitted surface, but in addition, for example, a material constituting the radiation-promoting layer 10B, 20B, and 20B is formed. The outer tube 10 and the inner tubes 20 and 120' may have a configuration in which the inner peripheral surface ι and the outer peripheral surfaces 2A and 120A themselves have radiation-promoting characteristics. Further, in the above-described embodiment, the inner tube 2 is configured to be eccentric with respect to the outer tube 10, but the configuration is not limited thereto. For example, as shown in Fig. 9, the hole portion 24 is arranged in a radial shape and has The inner tube 2〇' of the inner layer 2GB of the radiation-promoting layer may be configured to be concentric with the tube 10 having the radiation-promoting layer 10B. (Industrial Applicability) As described above, according to the combustion heater of the present invention, excessive temperature increase of the inner tube can be suppressed, and heating efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a front sectional view showing a combustion heater 1 of a first embodiment. The first Fig. 1 is a side cross-sectional view of the combustion heater 1 of the first embodiment. The second drawing is a plan view of the inner tube viewed from the side of the J-th area. The second drawing is a side cross-sectional view of a combustion heater equipped with an inner tube. Fig. 3 is a front sectional view showing a combustion heater of a third embodiment. Fig. 3 is a side cross-sectional view showing the combustion heater of the third embodiment. 26 320996 200940907 - Fig. 4 is a detailed view of the main part of the combustion heater of the fourth embodiment. Fig. 5 is a schematic view showing the outer tube and the inner tube of the fifth embodiment. Fig. 6A is a front sectional view showing a combustion heater of a sixth embodiment. Fig. 6B is a side sectional view showing the combustion heater of the sixth embodiment. Fig. 6C is an enlarged view of an essential part of the combustion heater of the sixth embodiment. Fig. 7A is a front sectional view showing a combustion heater of a seventh embodiment. Fig. 7B is a side cross-sectional view showing the combustion heater of the seventh embodiment. Fig. 7C is an enlarged view of an essential part of the combustion heater of the seventh embodiment. ❹ Fig. 7D is an enlarged view of a main part of the combustion heater of the seventh embodiment. Fig. 8A is a front sectional view showing a combustion heater of an eighth embodiment. Fig. 8B is a side sectional view showing the combustion heater of the eighth embodiment. Fig. 8C is an enlarged view of an essential part of the combustion heater of the eighth embodiment. Figure 9 is a detailed view of the main part of the combustion heater in which the inner tube and the outer tube are concentrically arranged. [Description of main component symbols] © 1 Burning heater 10 Outer tube (heat pipe) 10A Inner peripheral surface 10B, 20B, 120B radiation-promoting layer (radiation-promoting surface) 11 Exhaust pipe 20A, 120A outer peripheral surface 22 First region 24, 124 hole portion 30 combustion space 50 bluff body 20, 120 inner tube 21 supply path 23 second region 25 second hole portion 40, 41 support plate (support member) 50A concave curved surface 27 320996 200940907 F flame G combustion gas P preheating Zone S stagnation point
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