JP4350696B2

JP4350696B2 - Tint burner

Info

Publication number: JP4350696B2
Application number: JP2005311019A
Authority: JP
Inventors: 芳彦高須
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2005-10-26
Filing date: 2005-10-26
Publication date: 2009-10-21
Anticipated expiration: 2025-10-26
Also published as: JP2007120805A

Description

本発明は、給湯用熱源機等の燃焼装置で使用する濃淡バーナに関する。 The present invention relates to a light and dark burner used in a combustion apparatus such as a hot water supply heat source machine.

この種の濃淡バーナは、理論空燃比より燃料濃度が希薄な淡混合気を噴出する細長形状の淡炎口と、淡炎口の両側に位置し、理論空燃比より燃料濃度が濃い濃混合気を噴出する細長形状の一対の濃炎口とを有しており、所謂濃淡燃焼が行われてＮＯｘの発生が低減される。そして、濃淡バーナは、淡炎口及び濃炎口の長尺方向を前後方向、淡炎口及び濃炎口の短尺方向を横方向として、横方向に複数本並設した状態で使用される。 This type of lean burner is located at both sides of the narrow-shaped pale flame outlet, which emits a pale mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, and at the both sides of the pale flame mouth, where the rich mixture is richer in fuel concentration than the stoichiometric air-fuel ratio. And a pair of elongate thick flame outlets that ejects NO, and so-called light and dark combustion is performed to reduce the generation of NOx. The light and dark burners are used in a state in which a plurality of the burners are arranged side by side in the horizontal direction, with the long direction of the light flame mouth and the rich flame mouth being the front-rear direction and the short direction of the light flame mouth and the rich flame mouth being the horizontal direction.

ところで、濃淡バーナは、上記の如くＮＯｘを低減できるものの、高負荷燃焼時に振動燃焼を生じ易く、燃焼騒音が問題になる。そこで、従来、濃淡バーナの淡炎口を前後複数ブロックに区画し、各ブロック内で淡混合気の燃料濃度にばらつきを生じさせるようにしたものが知られている(例えば、特許文献１参照)。このものでは、淡炎口から噴出する淡混合気の燃焼によって発生する振動の周波数が燃料濃度のばらつきに起因して分散し、振動燃焼が抑制される。 By the way, although the light and dark burner can reduce NOx as described above, vibration combustion tends to occur during high load combustion, and combustion noise becomes a problem. In view of this, conventionally, there has been known a configuration in which a light flame outlet of a light and dark burner is divided into a plurality of front and rear blocks so that the fuel concentration of the light mixture varies within each block (see, for example, Patent Document 1). . In this case, the frequency of vibration generated by the combustion of the pale air-fuel mixture ejected from the pale flame outlet is dispersed due to the variation in the fuel concentration, and the vibration combustion is suppressed.

このように上記従来例は淡混合気の振動燃焼の抑制には効果的であるが、濃炎口から噴出する濃混合気の振動燃焼は抑制できない。ここで、濃淡バーナを横方向に複数本並設する場合、各濃淡バーナの横方向一側の濃炎口と該各濃淡バーナの横方向一側に並設される濃淡バーナの横方向他側の濃炎口とが隣り合い、これら濃炎口から噴出する濃混合気の燃焼によって生ずる振動の周波数が同調することで濃混合気の振動燃焼が助長される。これにより６００〜９５０Ｈｚの周波数をピークとする振動燃焼に起因した燃焼騒音を生ずるが、このような騒音は上記従来例では防止できない。
特許第３６１４７４５号公報 As described above, the conventional example is effective for suppressing the vibration combustion of the light mixture, but the vibration combustion of the rich mixture ejected from the rich flame port cannot be suppressed. Here, when arranging a plurality of light and dark burners side by side in the horizontal direction, the light flame outlet on one side in the horizontal direction of each light and dark burner and the other side in the horizontal direction of the light and dark burner arranged in parallel on one side in the horizontal direction of each light and dark burner The rich combustion port is adjacent to each other and the vibration frequency generated by the combustion of the rich mixture jetted from these rich flame ports is synchronized, so that the vibration combustion of the rich mixture is promoted. This produces combustion noise due to vibration combustion peaking at a frequency of 600 to 950 Hz, but such noise cannot be prevented in the above-described conventional example.
Japanese Patent No. 3614745

本発明は、以上の点に鑑み、濃混合気の振動燃焼を効果的に抑制できるようにした濃淡バーナを提供することをその課題としている。 In view of the above points, an object of the present invention is to provide a light and dark burner capable of effectively suppressing vibration combustion of a rich mixture.

本発明は、理論空燃比より燃料濃度が希薄な淡混合気を噴出する細長形状の淡炎口と、淡炎口の両側に位置し、理論空燃比より燃料濃度が濃い濃混合気を噴出する細長形状の一対の濃炎口とを有する濃淡バーナであって、淡炎口及び濃炎口の長尺方向を前後方向、淡炎口及び濃炎口の短尺方向を横方向として、横方向に複数本並設した状態で使用されるものにおいて、上記課題を解決するために以下の如く構成したことを特徴とする。 The present invention is located on both sides of a thin-shaped pale flame outlet that emits a lean air-fuel mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, and jets a rich air-fuel mixture that is richer in fuel concentration than the stoichiometric air-fuel ratio. A light and dark burner having a pair of elongate thick flame outlets, the longitudinal direction of the pale flame mouth and the thick flame mouth being the front-rear direction, and the short direction of the pale flame mouth and the rich flame mouth being the lateral direction, In order to solve the above-described problems, the present invention is characterized in that it is configured as follows in order to solve the above problems.

即ち、本願の第１発明は、各濃炎口が前後複数ブロックに区画され、各濃炎口の各ブロックから噴出する濃混合気の燃料濃度と、該各ブロックの前後に隣接するブロックから噴出する濃混合気の燃料濃度とが互いに異なると共に、横方向一側の濃炎口の各ブロックから噴出する濃混合気の燃料濃度と、該各ブロックと前後方向同一位置に存する横方向他側の濃炎口の各ブロックから噴出する濃混合気の燃料濃度とが互いに異なることを特徴とする。 That is , according to the first invention of the present application, each rich flame outlet is divided into a plurality of front and rear blocks, the fuel concentration of the rich air-fuel mixture ejected from each block of each rich flame mouth, and the ejected from the blocks adjacent to the front and rear of each block The fuel concentration of the rich mixture is different from each other, the fuel concentration of the rich mixture ejected from each block of the rich flame outlet on one side in the lateral direction, and the other side in the lateral direction existing at the same position in the front-rear direction as each block The fuel concentration of the rich air-fuel mixture ejected from each block of the rich flame outlet is different from each other.

これによれば、濃淡バーナを横方向に複数本並設した場合に、各濃淡バーナの横方向一側の濃炎口の各ブロックから噴出する濃混合気の燃料濃度と、該各ブロックの真横に隣り合う、横方向一側に並設した濃淡バーナの横方向他側の濃炎口の各ブロックから噴出する濃混合気の燃料濃度とが互いに相違することになる。そして、真横に隣り合う一方のブロックに生成される濃火炎の振動周波数と他方のブロックに生成される濃火炎の振動周波数とに燃料濃度の相違に起因して差を生ずる。更に、個々の濃淡バーナにおいても、濃炎口の各ブロックに生成される濃火炎の振動周波数とその前後のブロックに生成される濃火炎の振動周波数とに燃料濃度の相違に起因して差を生ずる。そのため、濃炎口の各ブロックに生成される濃火炎と該各ブロックの真横及び前後に隣り合う各ブロックに生成される濃火炎との間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to this, when a plurality of concentration burners are arranged in parallel in the horizontal direction, the fuel concentration of the rich mixture ejected from each block of the concentration flame outlet on one side in the horizontal direction of each concentration burner and the right side of each block The fuel concentrations of the rich air-fuel mixture ejected from the respective blocks of the rich flame outlet on the other side in the lateral direction of the concentration burner arranged side by side in the lateral direction are different from each other. Then, a difference is caused between the vibration frequency of the rich flame generated in one block adjacent to the side and the vibration frequency of the rich flame generated in the other block due to the difference in fuel concentration. Furthermore, even in the individual light and dark burners, there is a difference due to the difference in fuel concentration between the vibration frequency of the rich flame generated in each block of the rich flame outlet and the vibration frequency of the rich flame generated in the preceding and following blocks. Arise. Therefore, the vibration of the rich mixture is caused by the mutual interference action due to the frequency difference between the rich flame generated in each block of the rich flame outlet and the rich flame generated in each block adjacent to the front and back of each block. Combustion is suppressed.

尚、第１発明においては、淡炎口に供給される淡混合気の一部を、横方向一側の濃炎口の前側から奇数番目の各ブロックと、横方向他側の濃炎口の前側から偶数番目の各ブロックとに流入させる分流手段を備えることが望ましい。これによれば、淡混合気を流入させるブロックから噴出する濃混合気が淡混合気で希釈化されて燃料濃度が減少する。そして、横方向一側の濃炎口では、前側から奇数番目のブロックから噴出する濃混合気の燃料濃度が比較的薄くなり、横方向他側の濃炎口では、前側から偶数番目のブロックから噴出する濃混合気の燃料濃度が比較的薄くなる。従って、第１発明の上記構成を簡単に充足することができる。 In the first aspect of the invention, a part of the pale mixture supplied to the pale flame mouth is divided into odd blocks from the front side of the thick flame mouth on one side in the horizontal direction and the rich flame mouth on the other side in the horizontal direction. It is desirable to provide a diversion means for flowing into each even-numbered block from the front side. According to this, the rich air mixture ejected from the block into which the light air mixture flows is diluted with the light air mixture and the fuel concentration decreases. In the rich flame outlet on one side in the horizontal direction, the fuel concentration of the rich mixture jetted from the odd-numbered block from the front side becomes relatively thin, and in the rich flame outlet on the other side in the horizontal direction, from the even-numbered block from the front side. The fuel concentration of the ejected rich mixture becomes relatively thin. Therefore, the above configuration of the first invention can be satisfied easily.

また、本願の第２発明は、各濃炎口が前後複数ブロックに区画され、各濃炎口の各ブロックの炎口負荷と、該各ブロックの前後に隣接するブロックの炎口負荷とが互いに異なると共に、横方向一側の濃炎口の各ブロックの炎口負荷と、該各ブロックと前後方向同一位置に存する横方向他側の濃炎口の各ブロックの炎口負荷とが互いに異なることを特徴とする。 Further, according to the second invention of the present application, each rich flame outlet is divided into a plurality of front and rear blocks, and a flame mouth load of each block of each rich flame mouth and a flame mouth load of a block adjacent to the front and rear of each block are mutually connected. The flame load of each block of the rich flame outlet on one side in the horizontal direction is different from the flame load of each block of the rich flame outlet on the other side in the lateral direction at the same position as the respective blocks. It is characterized by.

これによれば、濃淡バーナを横方向に複数本並設した場合に、各濃淡バーナの横方向一側の濃炎口の各ブロックの炎口負荷と、該各ブロックの真横に隣り合う、横方向一側に並設した濃淡バーナの横方向他側の濃炎口の各ブロックの炎口負荷とが互いに相違することになる。そして、真横に隣り合う一方のブロックに生成される濃火炎の振動周波数と他方のブロックに生成される濃火炎の振動周波数とに炎口負荷の相違に起因して差を生ずる。更に、個々の濃淡バーナにおいても、濃炎口の各ブロックに生成される濃火炎の振動周波数とその前後のブロックに生成される濃火炎の振動周波数とに炎口負荷の相違に起因して差を生ずる。そのため、濃炎口の各ブロックに生成される濃火炎と該各ブロックの真横及び前後に隣り合う各ブロックに生成される濃火炎との間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to this, when a plurality of light and dark burners are juxtaposed in the horizontal direction, the load on the front of each block on the one side in the horizontal direction of each light and dark burner, and the horizontal The flame load of each block of the rich flame port on the other side in the horizontal direction of the dark and light burner arranged side by side in the direction is different from each other. Then, a difference is caused between the vibration frequency of the rich flame generated in one block adjacent to the side and the vibration frequency of the rich flame generated in the other block due to the difference in the flame load. Furthermore, even in the individual light and dark burners, there is a difference between the vibration frequency of the rich flame generated in each block of the rich flame outlet and the vibration frequency of the rich flame generated in the preceding and following blocks due to the difference in the flame mouth load. Is produced. Therefore, the vibration of the rich mixture is caused by the mutual interference action due to the frequency difference between the rich flame generated in each block of the rich flame outlet and the rich flame generated in each block adjacent to the front and back of each block. Combustion is suppressed.

尚、第２発明においては、横方向一側の濃炎口の前側から奇数番目の各ブロックの開口面積を前側から偶数番目のブロックの開口面積より大きくすると共に、前記横方向他側の濃炎口の前側から偶数番目の各ブロックの開口面積を前側から奇数番目のブロックの開口面積より大きくすることが望ましい。ここで、炎口負荷は開口面積の増加に伴い減少する。そのため、横方向一側の濃炎口では、前側から奇数番目のブロックの炎口負荷が比較的小さくなり、横方向他側の濃炎口では、前側から偶数番目のブロックの炎口負荷が比較的小さくなる。従って、第２発明の上記構成を簡単に充足することができる。 In the second invention, the opening area of each odd-numbered block from the front side of the thick flame outlet on one side in the horizontal direction is made larger than the opening area of the even-numbered block from the front side, and the rich flame on the other side in the horizontal direction is set. It is desirable that the opening area of each even-numbered block from the front side of the mouth is larger than the opening area of the odd-numbered blocks from the front side. Here, the flame load decreases as the opening area increases. For this reason, the flame load on the odd-numbered block from the front side is relatively small at the rich flame outlet on the one side in the horizontal direction, and the flame load on the even-numbered block from the front side is compared at the thick flame mouth on the other side in the horizontal direction. Become smaller. Therefore, the above configuration of the second invention can be satisfied easily.

図１は濃淡バーナ１を示している。この濃淡バーナ１は、バーナ本体２と、バーナ本体２の上部に被せられたバーナキャップ３とで構成されている。バーナ本体２の上端部には細長形状の淡炎口４が形成され、また、バーナキャップ３により、淡炎口４の両側に位置する細長形状の一対の濃炎口５Ｌ，５Ｒが形成されている。そして、理論空燃比より燃料濃度が希薄な淡混合気を淡炎口４から噴出させると共に、理論空燃比より燃料濃度が濃い濃混合気を各濃炎口５Ｌ，５Ｒから噴出させ、所謂濃淡燃焼を行わせるようにしている。以下、淡炎口４及び濃炎口５Ｌ，５Ｒの長尺方向を前後方向、淡炎口４及び濃炎口５Ｌ，５Ｒの短尺方向を横方向として、濃淡バーナ１の構成について詳述する。 FIG. 1 shows a light and dark burner 1. The light and dark burner 1 is composed of a burner body 2 and a burner cap 3 that covers the burner body 2. An elongated pale flame mouth 4 is formed at the upper end of the burner body 2, and a pair of elongated thick flame mouths 5 L and 5 R located on both sides of the pale flame mouth 4 are formed by the burner cap 3. Yes. Then, a light mixture whose fuel concentration is lower than the stoichiometric air-fuel ratio is ejected from the pale flame port 4, and a rich mixture whose fuel concentration is higher than the stoichiometric air-fuel ratio is ejected from the respective rich flame ports 5L and 5R, so-called so-called lean combustion. I am trying to do. Hereinafter, the configuration of the light and dark burner 1 will be described in detail with the long direction of the light flame mouth 4 and the thick flame ports 5L and 5R as the front-rear direction and the short direction of the light flame mouth 4 and the thick flame ports 5L and 5R as the horizontal direction.

バーナ本体１は、図２及び図３に示す如く、横方向に対峙する一対の側板２ａ，２ａで構成されている。尚、両側板２ａ，２ａは連続する１枚の板で形成されており、この板をバーナ本体２の下縁となる折曲げ線で合掌状態に折り曲げることによりバーナ本体２が形成される。そして、各側板２ａのプレス加工により、バーナ本体２に、上端部の淡炎口４と、下部の淡混合管部６と、淡混合管部６に連なり、淡混合管部６の上側で前後方向に延在する分布管部７と、分布管部７と淡炎口４との間の横幅を狭めた絞り部８とが形成されている。 As shown in FIGS. 2 and 3, the burner body 1 is composed of a pair of side plates 2 a and 2 a that face each other in the lateral direction. The both side plates 2a, 2a are formed of a single continuous plate, and the burner body 2 is formed by bending this plate into a palm-joined state at a fold line that becomes the lower edge of the burner body 2. Then, by pressing each side plate 2 a, the burner body 2 is connected to the upper-side light flame port 4, the lower light mixing tube portion 6, and the light mixing tube portion 6. A distribution tube portion 7 extending in the direction and a narrowed portion 8 having a narrower lateral width between the distribution tube portion 7 and the light flame opening 4 are formed.

淡混合管部６は、バーナ本体２の下部後縁に位置する上流端から前方にのびており、その前端部が上方に屈曲して分布管部７に連通している。また、バーナ本体１の後部には、淡混合管部６と分布管部７との間に位置させて、左側の濃炎口５Ｌに連なる濃混合管部９Ｌと、右側の濃炎口５Ｒに連なる濃混合管部９Ｒとが形成されている。左右の濃混合管部９Ｌ，９Ｒは、バーナ本体２の両側板２ａ，２ａ間に介設する仕切り板９ａで仕切られている。各濃混合管部９Ｌ，９Ｒは、バーナ本体２の後縁に位置する上流端から前方に少しのびて終端しており、その前部の側面に通気孔９ｂが複数形成されている。 The light mixing pipe portion 6 extends forward from the upstream end located at the lower rear edge of the burner body 2, and its front end portion is bent upward and communicates with the distribution pipe portion 7. Further, the burner body 1 has a rear portion between the light mixing tube portion 6 and the distribution tube portion 7, and a thick mixing tube portion 9 </ b> L connected to the left thick flame port 5 </ b> L and a right rich flame port 5 </ b> R. A continuous thick mixing tube portion 9R is formed. The left and right thick mixing pipe portions 9L, 9R are partitioned by a partition plate 9a interposed between both side plates 2a, 2a of the burner body 2. Each of the thick mixing pipe portions 9L and 9R is terminated slightly from the upstream end located at the rear edge of the burner body 2, and a plurality of vent holes 9b are formed on the side surface of the front portion.

バーナキャップ３は、バーナ本体２の一対の側板２ａ，２ａの外側に被せられる一対の側板３ａ，３ａと、両側板３ａ，３ａをその上縁で連結する複数のブリッジ部３ｂとで構成されている。そして、バーナ本体２の左右の各側板２ａとバーナキャップ３の左右の各側板３ａとの間に、左右の各濃炎口５Ｌ，５Ｒと、左右の各濃混合管部９から通気孔９ｂを介してバーナ本体２の外側に流出する混合気を各濃炎口５Ｌ，５Ｒに導く通路とが形成される。尚、バーナキャップ３の側板３ａには、バーナ本体２の分布管部７の前後方向中間部分の外側面に当接して、通気孔９ｂからの混合気の流れを前後方向に振り分ける凹部３ｃと、バーナ本体２の淡炎口４の外側面に当接して、各濃炎口５Ｌ，５Ｒを前後複数ブロック５ａに区画する上下方向に長手の複数の凹部３ｄとが形成されている。本実施形態では、各濃炎口５Ｌ，５Ｒを最前位の＃１のブロック５ａから最後位の＃５のブロック５ａまでの５ブロックに区画している。 The burner cap 3 is composed of a pair of side plates 3a, 3a that covers the outside of the pair of side plates 2a, 2a of the burner body 2, and a plurality of bridge portions 3b that connect the side plates 3a, 3a at their upper edges. Yes. Between the left and right side plates 2 a of the burner body 2 and the left and right side plates 3 a of the burner cap 3, vent holes 9 b are formed from the left and right thick flame ports 5 L and 5 R and from the left and right thick mixing pipe portions 9. And a passage for guiding the air-fuel mixture flowing out of the burner body 2 to the rich flame ports 5L and 5R. The side plate 3a of the burner cap 3 is in contact with the outer surface of the intermediate portion in the front-rear direction of the distribution pipe portion 7 of the burner body 2, and a recess 3c that distributes the flow of the air-fuel mixture from the vent hole 9b in the front-rear direction. A plurality of vertically recessed portions 3d are formed in contact with the outer side surface of the light flame mouth 4 of the burner body 2 to partition each of the rich flame mouths 5L and 5R into a plurality of front and rear blocks 5a. In the present embodiment, each of the rich flame outlets 5L and 5R is divided into 5 blocks from the frontmost # 1 block 5a to the last # 5 block 5a.

バーナ本体１の淡炎口４内には、複数枚の整流板４ａから成る整流部材が装着されており、各整流板４ａ，４ａ間に横幅の狭い炎口流路が画成される。これら整流板４ａは、その上部の前後複数箇所の潰し部４ｂにおいて隙間無く重なり合っており、炎口流路が前後複数のブロックに区画される。尚、バーナキャップ３のブリッジ部３ｂは潰し部４ｂの真上に位置する。また、バーナ本体２の側板２ａには、淡炎口４の上下方向中間部に位置させて、整流部材を横方向両側から挟み込む狭窄部４ｃが形成されている。これにより、狭窄部４ｃの上側の側板２ａの部分と最外側の整流板４ａとの間に混合気が流れない盲空隙４ｄが画成される。 A rectifying member made up of a plurality of rectifying plates 4a is mounted in the light flame outlet 4 of the burner body 1, and a narrow flaming passage is defined between the rectifying plates 4a and 4a. These baffle plates 4a overlap with each other without crevice at the crushing portions 4b at a plurality of positions on the front and back, and the flame channel is divided into a plurality of front and back blocks. Note that the bridge portion 3b of the burner cap 3 is positioned directly above the crushed portion 4b. The side plate 2a of the burner main body 2 is formed with a narrowed portion 4c that is positioned at the middle portion in the vertical direction of the pale flame mouth 4 and sandwiches the rectifying member from both lateral sides. As a result, a blind gap 4d in which the air-fuel mixture does not flow is defined between the upper side plate 2a portion of the constricted portion 4c and the outermost rectifying plate 4a.

ここで、濃淡バーナ１は横方向に複数本並設した状態で給湯用熱源機等の燃焼装置に組み込まれる。そして、図示省略した燃焼ファン(図示せず)からの空気を供給する給気室に、図４に示す如く横長のダンパ１０を設けて、このダンパ１０に複数本の濃淡バーナ１の下部後縁を対向させている。ダンパ１０には、各濃淡バーナ１の淡混合管部６の上流端に臨む図示省略した一次空気用開口部と、各濃淡バーナ１の左右の濃混合管部９Ｌ，９Ｒの上流端に臨む左右一対の一次空気用開口部１１Ｌ，１１Ｒが開設されている。また、ダンパ１０の後側には横長のガスマニホールド１２が配置されている。ガスマニホールド１２には、各濃淡バーナ１の淡混合管部６の上流端に臨むガスノズル１３が設けられると共に、各濃淡バーナ１の左右の濃混合管部９Ｌ，９Ｒの上流端に臨む左右一対のノズル孔１４Ｌ，１４Ｒが開設されている。 Here, the light and dark burner 1 is incorporated in a combustion apparatus such as a hot water supply heat source unit in a state in which a plurality of the light and dark burners 1 are arranged side by side. Then, a horizontally long damper 10 is provided as shown in FIG. 4 in an air supply chamber for supplying air from a combustion fan (not shown), and the lower rear edge of the plurality of light and dark burners 1 is provided in the damper 10. Are facing each other. The damper 10 includes a primary air opening (not shown) that faces the upstream end of the light mixing tube portion 6 of each light and dark burner 1, and left and right surfaces that face the upstream ends of the left and right dark mixing tube portions 9L and 9R of each light and dark burner 1. A pair of primary air openings 11L and 11R are provided. A horizontally long gas manifold 12 is disposed on the rear side of the damper 10. The gas manifold 12 is provided with a gas nozzle 13 facing the upstream end of the light mixing tube portion 6 of each concentration burner 1 and a pair of left and right concentration mixing tube portions 9L and 9R facing each upstream end of the concentration mixing tube portions 9L and 9R. Nozzle holes 14L and 14R are opened.

かくして、淡混合管部６にガスノズル１３から燃料ガスが供給されると共に、その上流端に臨む一次空気用開口部を通して燃焼ファンからの空気が供給される。ここで、淡混合管部６の断面積及びこれに臨む一次空気用開口部は比較的大きく、そのため、淡混合管部６への一次空気の供給量が多くなって淡混合気が生成される。また、左右の各濃混合管部９Ｌ，９Ｒには、各ノズル孔１４Ｌ，１４Ｒから燃料ガスが供給されると共に、各一次空気用開口部１１Ｌ，１１Ｒを通して燃焼ファンからの空気が供給される。ここで、各濃混合管部９Ｌ，９Ｒの断面積及び各一次空気用開口部１１Ｌ，１１Ｒは比較的小さく、そのため、各濃混合管部９Ｌ，９Ｒへの一次空気の供給量が少なくなって濃混合気が生成される。 Thus, the fuel gas is supplied from the gas nozzle 13 to the light mixing pipe 6 and air from the combustion fan is supplied through the primary air opening facing the upstream end thereof. Here, the cross-sectional area of the light mixing pipe section 6 and the opening for primary air facing this are relatively large, so that the amount of primary air supplied to the light mixing pipe section 6 increases and a light mixture is generated. . Further, fuel gas is supplied from the nozzle holes 14L and 14R to the left and right concentrated mixing pipe portions 9L and 9R, and air from the combustion fan is supplied through the primary air openings 11L and 11R. Here, the cross-sectional areas of the concentrated mixing pipe portions 9L and 9R and the opening portions 11L and 11R for the primary air are relatively small, so that the amount of primary air supplied to the concentrated mixing tube portions 9L and 9R is reduced. A rich mixture is produced.

淡混合管部６で生成された淡混合気は、分布管部７と絞り部８とを介して淡炎口４に流れ、各整流板４ａ，４ａ間の炎口流路を経て淡炎口４の上方に噴出し、燃焼する。絞り部８の横幅は、淡混合管部６の下流端に近い前方部分から後方に向けて次第に広がっており、淡炎口４に流入する淡混合気の前後方向の流量分布が均等化される。 The light mixture generated in the light mixing pipe section 6 flows to the light flame opening 4 via the distribution pipe section 7 and the throttle section 8, and passes through the flame opening passage between the rectifying plates 4a and 4a. 4 is ejected and burned. The lateral width of the throttle portion 8 gradually widens from the front portion near the downstream end of the light mixing pipe portion 6 toward the rear, and the flow distribution in the front-rear direction of the light mixture flowing into the light flame port 4 is equalized. .

各濃混合管部９Ｌ，９Ｒで生成された濃混合気は、通気孔９ｂからバーナ本体２の各側板２ａとバーナキャップ３の各側板３ａとの間の通路を介して各濃炎口５Ｌ，５Ｒに流れ、各濃炎口５Ｌ，５Ｒの各ブロック５ａの上方に噴出して燃焼する。 The rich air-fuel mixture generated in each of the thick mixing pipe portions 9L and 9R passes through the passages between the side plates 2a of the burner body 2 and the side plates 3a of the burner cap 3 through the vent holes 9b. It flows to 5R and is jetted above each block 5a of each rich flame outlet 5L, 5R and burned.

ここで、濃淡バーナ１を横方向に複数本並設すると、図５の左側の濃淡バーナ１の右側の濃炎口５Ｒ―ＬＢ(ＬＢは左側バーナの炎口であることを示す添え字である)と、右側の濃淡バーナ１の左側の濃炎口５Ｌ―ＲＢ(ＲＢは右側バーナの炎口であることを示す添え字である)とが横方向に隣り合うことになる。このままでは、これら隣り合う濃炎口５Ｒ―ＬＢ，５Ｌ―ＲＢから噴出する濃混合気の燃焼によって生ずる振動の周波数が同調し、濃混合気の振動燃焼が助長される。これにより６００〜９５０Ｈｚの周波数をピークとする振動燃焼に起因した燃焼騒音が大きくなる。 Here, when a plurality of the light and dark burners 1 are arranged in the horizontal direction, the right dark flame burner 5R-LB (LB is a subscript indicating that the left burner is the left flame burner 1). ) And the left flame outlet 5L-RB (RB is a subscript indicating that it is the flame burner of the right burner) on the right side of the light and dark burner 1 are laterally adjacent to each other. If this is the case, the frequency of vibration generated by the combustion of the rich air mixture ejected from the adjacent rich flame ports 5R-LB and 5L-RB is synchronized, and the vibration combustion of the rich air mixture is promoted. Thereby, the combustion noise resulting from the vibration combustion which makes the frequency of 600-950 Hz a peak becomes large.

そこで、第１比較例では、濃淡バーナ１の左側の濃炎口５Ｌから噴出する濃混合気の燃料濃度と、右側の濃炎口５Ｒから噴出する濃混合気の燃料濃度とを互いに異ならせるようにしている。具体的には、図４に示す如く、濃淡バーナ１の左右の濃混合管部９Ｌ，９Ｒに臨む左右の一次空気用開口部１１Ｌ，１１Ｒの一方、例えば、左側の一次空気用開口部１１Ｌを右側の一次空気用開口部１１Ｒよりも大きくしている。そのため、左側の濃混合管部９Ｌへの一次空気の供給量が右側の濃混合管部９Ｒへの一次空気の供給量より多くなり、左側の濃炎口５Ｌから噴出する濃混合気の燃料濃度が右側の濃炎口５Ｒから噴出する濃混合気の燃料濃度より薄くなる。これにより、濃混合気の空気過剰率を、例えば、左側の濃炎口５Ｌから噴出する濃混合気では０．７、右側の濃炎口５Ｒから噴出する濃混合気では０．６にすることができる。 Therefore, in the first comparative example , the fuel concentration of the rich mixture ejected from the left rich flame port 5L of the concentration burner 1 is different from the fuel concentration of the rich mixture ejected from the right rich flame port 5R. I have to. Specifically, as shown in FIG. 4, one of the left and right primary air openings 11L and 11R facing the left and right thick mixing pipe portions 9L and 9R of the light and dark burner 1, for example, the left primary air opening 11L is provided. It is larger than the primary air opening 11R on the right side. Therefore, the supply amount of the primary air to the left rich mixing pipe portion 9L is larger than the supply amount of the primary air to the right rich mixing pipe portion 9R, and the fuel concentration of the rich mixture jetted from the left rich flame port 5L Becomes thinner than the fuel concentration of the rich air-fuel mixture ejected from the right rich flame port 5R. Thereby, the excess air ratio of the rich mixture is set to 0.7 for the rich mixture ejected from the left rich flame port 5L, and to 0.6 for the rich mixture jetted from the right rich flame port 5R, for example. Can do.

以上の構成によれば、濃淡バーナ１を横方向に複数本並設した場合に横方向に隣り合う一方の濃炎口５Ｒ―ＬＢと他方の濃炎口５Ｌ―ＲＢとから燃料濃度の異なる濃混合気が噴出することになる。そして、隣り合う一方の濃炎口５Ｒ−ＬＢに生成される濃混合気の燃焼炎(濃火炎)の振動周波数と他方の濃炎口５Ｌ−ＲＢに生成される濃火炎の振動周波数とに燃料濃度の相違に起因して差を生ずる。そのため、隣り合う濃火炎間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to the above configuration, when a plurality of the concentration burners 1 are arranged in the horizontal direction, the fuel concentration differs from one of the rich flame ports 5R-LB and the other rich flame port 5L-RB adjacent in the horizontal direction. The mixture will spout. Then, fuel is supplied to the vibration frequency of the combustion flame (rich flame) of the rich mixture generated in one adjacent rich flame port 5R-LB and the vibration frequency of the rich flame generated in the other rich flame port 5L-RB. Differences occur due to the concentration differences. Therefore, the vibration combustion of the rich mixture is suppressed by the mutual interference effect due to the frequency difference between the adjacent rich flames.

尚、上記第１比較例において、濃淡バーナ１の左側の濃炎口５Ｌの各ブロック５ａから噴出する濃混合気の燃料濃度は互いに等しく、右側の濃炎口５Ｒの各ブロック５ａから噴出する濃混合気の燃料濃度も互いに等しいが、左右の各濃炎口５Ｌ，５Ｒから噴出する濃混合気の燃料濃度をブロック５ａ毎に相違させるようにしても良い。このようにした本発明の第１実施形態について図６を参照して説明する。 In the first comparative example , the fuel concentrations of the rich air-fuel mixture ejected from the respective blocks 5a of the rich flame port 5L on the left side of the light and dark burner 1 are equal to each other, and the rich concentrations ejected from the respective blocks 5a of the thick flame port 5R on the right side. Although the fuel concentration of the air-fuel mixture is also equal to each other, the fuel concentration of the rich air-fuel mixture ejected from the left and right rich flame ports 5L and 5R may be made different for each block 5a. The first embodiment of the present invention will be described with reference to FIG.

第１実施形態では、濃淡バーナ１の左右一方の濃炎口、例えば、左側の濃炎口５Ｌの前側から奇数番目の＃１、＃３、＃５の各ブロック５ａに、淡炎口４に供給される淡混合気の一部を、図６(ａ)に示す如く、バーナ本体２の左側の側板２ａの狭窄部４ｃの下側に形成した分流手段たる連通孔１５Ｌを介して流入させると共に、右側の濃炎口５Ｒの前側から偶数番目の＃２、＃４の各ブロック５ａに、淡炎口４に供給される淡混合気の一部を、図６(ｂ)に示す如く、バーナ本体２の右側の側板２ａの狭窄部４ｃの下側に形成した分流手段たる連通孔１５Ｒを介して流入させている。淡混合気を流入させるブロック５ａから噴出する濃混合気は淡混合気で希釈化されて燃料濃度が減少する。従って、左側濃炎口５Ｌでは、＃１、＃３、＃５のブロック５ａから噴出する濃混合気の燃料濃度が＃２、＃４のブロック５ａから噴出する濃混合気の燃料濃度より薄くなり、右側濃炎口５Ｒでは、＃２、＃４のブロック５ａから噴出する濃混合気の燃料濃度が＃１、＃３、＃５のブロック５ａから噴出する濃混合気の燃料濃度より薄くなる。結局、左右の各濃炎口５Ｌ，５Ｒの各ブロック５ａから噴出する濃混合気の燃料濃度と該各ブロック５ａの前後に隣接するブロック５ａから噴出する濃混合気の燃料濃度とが互いに異なることになり、また、左側の濃炎口５Ｌの各ブロック５ａから噴出する濃混合気の燃料濃度と該各ブロック５ａと前後方向同一位置に存する右側の濃炎口５Ｒの各ブロック５ａから噴出する濃混合気の燃料濃度とが互いに異なることになる。 In the first embodiment, the dark flame outlet 1 is connected to the left and right thick flame outlets, for example, the odd-numbered blocks # 1, # 3, and # 5 from the front side of the left thick flame outlet 5 L, to the pale flame outlet 4. As shown in FIG. 6A, a part of the supplied light air-fuel mixture is introduced through a communication hole 15L which is a diversion means formed below the narrowed portion 4c of the left side plate 2a of the burner body 2. , A portion of the light mixture supplied to the light flame outlet 4 to the even-numbered # 2 and # 4 blocks 5a from the front side of the right flame flame outlet 5R is burnered as shown in FIG. The main body 2 is allowed to flow in through a communication hole 15R which is a diversion means formed on the lower side of the narrowed portion 4c of the right side plate 2a. The rich air mixture ejected from the block 5a through which the light air mixture flows is diluted with the light air mixture, and the fuel concentration decreases. Accordingly, at the left rich flame outlet 5L, the fuel concentration of the rich air mixture ejected from the blocks 5a of # 1, # 3, and # 5 becomes thinner than the fuel concentration of the rich air mixture ejected from the blocks 5a of # 2 and # 4. At the right rich flame outlet 5R, the fuel concentration of the rich mixture jetted from the blocks 5a of # 2, # 4 becomes thinner than the fuel concentration of the rich mixture jetted from the blocks 5a of # 1, # 3, # 5. As a result, the fuel concentration of the rich mixture jetted from the respective blocks 5a of the left and right rich flame outlets 5L and 5R and the fuel concentration of the rich mixture jetted from the blocks 5a adjacent to the front and rear of each block 5a are different from each other. Further, the fuel concentration of the rich air-fuel mixture ejected from the respective blocks 5a of the left rich flame outlet 5L and the thick fuel ejected from the respective blocks 5a of the right rich flame outlet 5R located at the same position in the front-rear direction as the respective blocks 5a. The fuel concentration of the mixture will be different from each other.

以上の構成によれば、濃淡バーナ１を横方向に複数本並設した場合、図５の左側の濃淡バーナ１の右側濃炎口５Ｒ―ＬＢのブロックのうち燃料濃度が比較的濃い濃混合気を噴出する＃１，＃３、＃５の各ブロック５ａと、右側の濃淡バーナ１の左側濃炎口５Ｌ−ＲＢのブロックのうち燃料濃度が比較的薄い濃混合気を噴出する＃１，＃３、＃５の各ブロック５ａとが真横に隣り合い、濃炎口５Ｒ―ＬＢのブロックのうち燃料濃度が比較的薄い濃混合気を噴出する＃２，＃４の各ブロック５ａと、濃炎口５Ｌ−ＲＢのブロックのうち燃料濃度が比較的濃い濃混合気を噴出する＃２，＃４の各ブロック５ａとが真横に隣り合うことになる。そして、真横に隣り合う一方のブロック５ａに生成される濃火炎の振動周波数と他方のブロック５ａに生成される濃火炎の振動周波数とに燃料濃度の相違に起因して差を生ずる。更に、個々の濃淡バーナ１においても、各濃炎口５Ｌ，５Ｒの各ブロック５ａに生成される濃火炎の振動周波数とその前後のブロック５ａに生成される濃火炎の振動周波数とに燃料濃度の相違に起因して差を生ずる。そのため、各ブロック５ａに生成される濃火炎と該各ブロック５ａの真横及び前後に隣り合う各ブロック５ａに生成される濃火炎との間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to the above configuration, when a plurality of concentration burners 1 are juxtaposed in the horizontal direction, a rich mixture with a relatively high fuel concentration in the block of the right concentration flame outlet 5R-LB of the concentration burner 1 on the left side of FIG. # 1, # 3, # 5 and # 5, and # 5, # 5, # 5 and # 5, which emit a relatively low fuel concentration in the block 5L-RB on the left side of the right burner 1 3 and # 5 blocks 5a are directly adjacent to each other, and among the blocks of the rich flame outlet 5R-LB, each of the blocks 5a of # 2 and # 4 that eject a rich mixture having a relatively low fuel concentration, and the rich flame Among the blocks of the mouth 5L-RB, the blocks 5a of # 2 and # 4 that eject a rich mixture having a relatively high fuel concentration are directly adjacent to each other. Then, a difference is caused between the vibration frequency of the rich flame generated in one block 5a adjacent to the side and the vibration frequency of the rich flame generated in the other block 5a due to the difference in fuel concentration. Further, in each of the light and dark burners 1, the fuel concentration is divided into the vibration frequency of the rich flame generated in each block 5a of each of the rich flame outlets 5L and 5R and the vibration frequency of the rich flame generated in the blocks 5a before and after that. Differences are caused by differences. Therefore, the oscillating combustion of the rich mixture is caused by the mutual interference action due to the frequency difference between the rich flame generated in each block 5a and the rich flame generated in each block 5a adjacent to the front and back of each block 5a. Is suppressed.

以上、濃混合気の燃料濃度を相違させて濃混合気の振動燃焼を抑制する実施形態について説明したが、左右の濃炎口５Ｌ，５Ｒの炎口負荷(炎口の単位面積、単位時間当たりの燃料の発生熱量)を相違させても濃混合気の振動燃焼を抑制できる。このようにした第２比較例について図７を参照して説明する。 As described above, the embodiment in which the fuel concentration of the rich mixture is made different to suppress the vibration combustion of the rich mixture has been described. The vibration combustion of the rich air-fuel mixture can be suppressed even if the generated heat amount of the fuel is made different. A second comparative example having such a configuration will be described with reference to FIG.

第２比較例では、濃淡バーナ１の左右の濃混合管部９Ｌ，９Ｒに臨む左右のノズル孔１４Ｌ，１４Ｒの一方、例えば、左側のノズル孔１４Ｌの孔径を右側のノズル孔１４Ｒの孔径よりも大きくしている。そのため、左側の濃混合管部９Ｌへの燃料ガスの供給量が右側の濃混合管部９Ｒへの燃料ガスの供給量より多くなり、左側の濃炎口５Ｌの炎口負荷が右側の濃炎口５Ｒの炎口負荷より大きくなる。 In the second comparative example , one of the left and right nozzle holes 14L, 14R facing the left and right thick mixing tube portions 9L, 9R of the light / dark burner 1, for example, the hole diameter of the left nozzle hole 14L is larger than the hole diameter of the right nozzle hole 14R. It is getting bigger. Therefore, the amount of fuel gas supplied to the left rich mixing tube portion 9L is larger than the amount of fuel gas supplied to the right rich mixing tube portion 9R, and the load of the left concentrated flame port 5L is increased to the right. It becomes larger than the flame load of the mouth 5R.

これによれば、濃淡バーナ１を横方向に複数本並設した場合、横方向に隣り合う図５の左側の濃淡バーナ１の右側濃炎口５Ｒ−ＬＢの炎口負荷と右側の濃淡バーナ１の左側濃炎口５Ｌ−ＲＢの炎口負荷とが互いに相違することになる。そして、隣り合う一方の濃炎口５Ｒ−ＬＢに生成される濃火炎の振動周波数と他方の濃炎口５Ｌ−ＲＢに生成される濃火炎の振動周波数とに炎口負荷の相違に起因して差を生ずる。そのため、隣り合う濃火炎間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to this, when a plurality of density burners 1 are arranged in the horizontal direction, the load on the right side flame outlet 5R-LB of the density burner 1 on the left side in FIG. The left flame outlet 5L-RB is different from the flame mouth load. Then, due to the difference in the flame mouth load between the vibration frequency of the rich flame generated at the adjacent one of the rich flame openings 5R-LB and the vibration frequency of the rich flame generated at the other rich flame opening 5L-RB. Make a difference. Therefore, the vibration combustion of the rich mixture is suppressed by the mutual interference effect due to the frequency difference between the adjacent rich flames.

尚、上記第２比較例において、濃淡バーナ１の左側の濃炎口５Ｌの各ブロック５ａの炎口負荷は互いに等しく、右側の濃炎口５Ｒの各ブロック５ａの炎口負荷も互いに等しいが、左右の各濃炎口５Ｌ，５Ｒの炎口負荷をブロック５ａ毎に相違させるようにしても良い。このようにした本発明の第２実施形態について図８を参照して説明する。 In the second comparative example , the flame mouth load of each block 5a of the dark flame outlet 5L on the left side of the dark and light burner 1 is equal to each other, and the flame mouth load of each block 5a of the right flame flame 5R is also equal to each other. You may make it make flame load of left and right each thick flame mouths 5L and 5R differ for every block 5a. A second embodiment of the present invention will be described with reference to FIG.

第２実施形態では、濃淡バーナ１の左右一方の濃炎口、例えば、左側の濃炎口５Ｌの前側から奇数番目の＃１、＃３、＃５の各ブロック５ａに合致する側板２ａの部分に盲空隙４ｄ側への凹入部を形成して、該各ブロック５ａの開口面積を前側から偶数番目の＃２、＃４の各ブロック５ａの開口面積より大きくしている。また、右側の濃炎口５Ｒの前側から偶数番目の＃２、＃４の各ブロック５ａに合致する側板２ａの部分にも盲空隙４ｄ側への凹入部を形成して、該各ブロック５ａの開口面積を前側から奇数番目の＃１，＃３、＃５の各ブロック５ａの開口面積より大きくしている。 In the second embodiment, the portion of the side plate 2a that matches the odd-numbered blocks # 1, # 3, and # 5 from the front side of the left and right thick flame outlets of the light and dark burner 1, for example, the left thick flame mouth 5L. A recessed portion is formed on the blind gap 4d side so that the opening area of each block 5a is larger than the opening area of the even-numbered blocks # 2 and # 4 from the front side. Also, a concave portion to the blind gap 4d side is formed in the portion of the side plate 2a that coincides with the even-numbered # 2 and # 4 blocks 5a from the front side of the right rich flame outlet 5R. The opening area is made larger than the opening area of each of the odd-numbered blocks # 1, # 3, and # 5 from the front side.

ここで、ブロック５ａの開口面積を大きくしても、その上流側での流量規制により濃混合気の噴出量は殆ど増加せず、開口面積を大きくしたブロック５ａの炎口負荷は小さくなる。従って、左側濃炎口５Ｌでは、＃１、＃３、＃５のブロック５ａの炎口負荷が＃２、＃４のブロック５ａの炎口負荷より小さくなり、右側濃炎口５Ｒでは、＃２、＃４のブロック５ａの炎口負荷が＃１、＃３、＃５のブロック５ａの炎口負荷より小さくなる。結局、左右の各濃炎口５Ｌ，５Ｒの各ブロック５ａの炎口負荷と、該各ブロック５ａの前後に隣接するブロック５ａの炎口負荷とが互いに異なることになり、また、左側の濃炎口５Ｌの各ブロック５ａの炎口負荷と該各ブロック５ａと前後方向同一位置に存する右側の濃炎口５Ｒの各ブロック５ａの炎口負荷とが互いに異なることになる。 Here, even if the opening area of the block 5a is increased, the amount of jet of the rich air-fuel mixture hardly increases due to the flow rate restriction on the upstream side, and the flame opening load of the block 5a having a larger opening area is reduced. Accordingly, in the left rich flame outlet 5L, the flame outlet load of the blocks 5a of # 1, # 3, and # 5 is smaller than that of the block 5a of # 2 and # 4, and in the right rich flame outlet 5R, # 2 The flame load of the block 5a of # 4 becomes smaller than the flame load of the block 5a of # 1, # 3, and # 5. Eventually, the flame outlet load of each block 5a of each of the left and right concentrated flame outlets 5L and 5R and the flame outlet load of the block 5a adjacent to the front and rear of each block 5a are different from each other, and the left flame flame The flame mouth load of each block 5a of the mouth 5L and the flame mouth load of each block 5a of the right concentrated flame mouth 5R at the same position in the front-rear direction as each block 5a are different from each other.

以上の構成によれば、濃淡バーナ１を横方向に複数本並設した場合、図８の左側の濃淡バーナ１の右側濃炎口５Ｒ―ＬＢのブロックのうち炎口負荷が比較的大きな＃１，＃３、＃５の各ブロック５ａと、右側の濃淡バーナ１の左側濃炎口５Ｌ−ＲＢのブロックのうち炎口負荷が比較的小さな＃１，＃３、＃５の各ブロック５ａとが真横に隣り合い、濃炎口５Ｒ―ＬＢのブロックのうち炎口負荷が比較的小さな＃２，＃４の各ブロック５ａと、濃炎口５Ｌ−ＲＢのブロックのうち炎口負荷が比較的大きな＃２，＃４の各ブロック５ａとが真横に隣り合うことになる。そして、真横に隣り合う一方のブロック５ａに生成される濃火炎の振動周波数と他方のブロック５ａに生成される濃火炎の振動周波数とに炎口負荷の相違に起因して差を生ずる。更に、個々の濃淡バーナ１においても、各濃炎口５Ｌ，５Ｒの各ブロック５ａに生成される濃火炎の振動周波数とその前後のブロック５ａに生成される濃火炎の振動周波数とに炎口負荷の相違に起因して差を生ずる。そのため、各ブロック５ａに生成される濃火炎と該各ブロック５ａの真横及び前後に隣り合う各ブロック５ａに生成される濃火炎との間での周波数差による相互干渉作用により濃混合気の振動燃焼が抑制される。 According to the above configuration, when a plurality of light and dark burners 1 are arranged side by side in the horizontal direction, the flame load on the left light and dark burner 5R-LB of the light and dark burner 1 on the left side in FIG. , # 3, # 5 and each block 5a of # 1, # 3, # 5 having a relatively low flame load among the blocks of the left side rich flame outlet 5L-RB of the right side lightness burner 1 Adjacent to the side, each of the blocks 5a of # 2 and # 4 having a relatively small flame outlet load among the blocks of the rich flame outlet 5R-LB, and a flame flame load of the blocks of the rich flame outlet 5L-RB having a relatively large flame outlet The blocks 5a of # 2 and # 4 are adjacent to each other. Then, a difference occurs between the vibration frequency of the rich flame generated in one block 5a adjacent to the side and the vibration frequency of the rich flame generated in the other block 5a due to the difference in the flame load. Further, in each of the light and dark burners 1, the flame mouth load is divided into the vibration frequency of the rich flame generated in each block 5 a of each of the rich flame outlets 5 L and 5 R and the vibration frequency of the rich flame generated in the block 5 a before and after that. The difference is caused by the difference. Therefore, the oscillating combustion of the rich mixture is caused by the mutual interference action due to the frequency difference between the rich flame generated in each block 5a and the rich flame generated in each block 5a adjacent to the front and back of each block 5a. Is suppressed.

尚、上記第１と第２の何れの実施形態によっても、濃混合気の振動燃焼に起因する６００〜９５０Ｈｚの周波数をピークとする振動燃焼に起因した燃焼騒音を低減できることが実験的に確認されている。 It has been experimentally confirmed that both the first and second embodiments can reduce the combustion noise caused by vibration combustion peaking at a frequency of 600 to 950 Hz due to vibration combustion of the rich mixture. ing.

本発明を適用する濃淡バーナの斜視図。The perspective view of the light and dark burner to which this invention is applied. 図１の濃淡バーナのバーナキャップを取外した状態の斜視図The perspective view of the state which removed the burner cap of the light and dark burner of FIG. 図１のＩＩＩ−ＩＩＩ線で切断した切断正面図。The cut front view cut | disconnected by the III-III line | wire of FIG. 第１比較例を示す図１のＩＶ−ＩＶ線で切断したバーナ使用状態での切断平面図。 The cutting top view in the burner use state cut | disconnected by the IV-IV line | wire of FIG. 1 which shows a 1st comparative example . バーナ使用状態での平面図。The top view in a burner use state. (ａ)本発明の第１実施形態を示す濃炎口の前側から奇数番目のブロックを横断するように切断したバーナの切断正面図、(ｂ)濃炎口の前側から偶数番目のブロックを横断するように切断したバーナの切断正面図。(a) Cut front view of burner cut so as to cross odd-numbered blocks from front side of rich flame port showing first embodiment of the present invention, (b) Crossed even-numbered blocks from front side of rich flame port The cutting front view of the burner cut | disconnected so that it may. 第２比較例を示す図４に相当する切断平面図。 The cutting top view equivalent to FIG. 4 which shows a 2nd comparative example . 本発明の第２実施形態を示す図５に相当する平面図。The top view equivalent to FIG. 5 which shows 2nd Embodiment of this invention.

Explanation of symbols

１…濃淡バーナ、４…淡炎口、５Ｌ，５Ｒ…濃炎口、５ａ…ブロック、９Ｌ，９Ｒ…濃混合管部、１０…ダンパ、１１Ｌ，１１Ｒ…一次空気用開口部、１４Ｌ，１４Ｒ…ノズル孔、１５Ｌ，１５Ｒ…連通孔(分流手段)。 DESCRIPTION OF SYMBOLS 1 ... Concentration burner, 4 ... Light flame outlet, 5L, 5R ... Concentration flame outlet, 5a ... Block, 9L, 9R ... Thick mixing pipe part, 10 ... Damper, 11L, 11R ... Opening part for primary air, 14L, 14R ... Nozzle holes, 15L, 15R ... communicating holes (dividing means).

Claims

A pair of elongate flaming mouths that emit a lean air-fuel mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, and a pair of elongate shapes that are located on both sides of the flaming mouth and eject a rich air-fuel mixture having a fuel concentration higher than the stoichiometric air-fuel ratio Concentration burners having a thick flame outlet, and a plurality of them arranged side by side in the lateral direction, with the long direction of the pale flame mouth and the thick flame mouth being the front-rear direction and the short direction of the pale flame mouth and the rich flame mouth being the horizontal direction In what is used in the state
Each rich flame outlet is divided into multiple front and back blocks,
The fuel concentration of the rich mixture jetted from each block of each rich flame outlet and the fuel concentration of the rich mixture jetted from blocks adjacent to the front and back of each block are different from each other,
The fuel concentration of the rich mixture jetted from each block of the rich flame outlet on one side in the lateral direction and the rich mixture jetted from each block of the rich flame outlet on the other side in the lateral direction at the same position as the respective blocks A light and dark burner characterized by different fuel concentrations .

A part of the pale mixture supplied to the pale flame mouth is divided into odd-numbered blocks from the front side of the thick flame mouth on the one side in the horizontal direction and even numbers from the front side of the thick flame mouth on the other side in the horizontal direction. 2. The light / dark burner according to claim 1, further comprising a diversion unit for flowing into each block .

A pair of elongate flaming mouths that emit a lean mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, and a pair of elongate shapes that are located on both sides of the flaming mouth and emit a rich mixture that has a fuel concentration higher than the theoretical air fuel consumption Concentration burners having a thick flame outlet, and a plurality of them arranged side by side in the lateral direction, with the long direction of the pale flame mouth and the thick flame mouth being the front-rear direction and the short direction of the pale flame mouth and the rich flame mouth being the horizontal direction In what is used in the state
Each rich flame outlet is divided into multiple front and back blocks,
The flame mouth load of each block of each rich flame mouth and the flame mouth load of blocks adjacent to the front and back of each block are different from each other,
The flame mouth load of each block of the rich flame outlet on one side in the horizontal direction is different from the flame load of each block of the thick flame mouth on the other side in the lateral direction at the same position as the respective blocks in the front-rear direction. A light and dark burner.

The opening area of each odd-numbered block from the front side of the horizontal flame outlet on the one side in the lateral direction is made larger than the opening area of the even-numbered block from the front side, and the even number from the front side of the thick flame mouth on the other side in the horizontal direction. 4. The light and dark burner according to claim 3, wherein an opening area of each block is made larger than an opening area of an odd-numbered block from the front side .