JP5466915B2 - Gas burner - Google Patents

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JP5466915B2
JP5466915B2 JP2009236874A JP2009236874A JP5466915B2 JP 5466915 B2 JP5466915 B2 JP 5466915B2 JP 2009236874 A JP2009236874 A JP 2009236874A JP 2009236874 A JP2009236874 A JP 2009236874A JP 5466915 B2 JP5466915 B2 JP 5466915B2
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distribution chamber
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burner body
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JP2011085281A (en
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万之 赤木
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Rinnai Corp
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本発明は、ガスコンロに組み込まれるガスバーナに関するものである。   The present invention relates to a gas burner incorporated in a gas stove.

ガスコンロに組み込まれる従来のガスバーナにおいて、ガスと空気の混合ガスをバーナボディの内部空間へ導くベンチュリ管状の混合管は、混合ガスの空気過剰率が燃焼に適したレベルとなるよう、その長さが比較的長く設定されている（例えば、特許文献１参照）。   In a conventional gas burner incorporated in a gas stove, the length of the venturi-shaped mixing tube that guides the mixed gas of gas and air to the internal space of the burner body is such that the excess air ratio of the mixed gas is at a level suitable for combustion. It is set relatively long (for example, see Patent Document 1).

図６（ａ）および（ｂ）に示すように、上記従来のガスバーナ７は、内外二重円筒状のバーナボディ７１と、バーナボディ７１の分布室入口９１からその側方へ延びるベンチュリ管状の混合管７２とを備えており、ノズル７４から混合管７２のガス入口９２へ向けて噴射されたガスを、ベンチュリ効果によってそのガス入口９２の周辺から混合管７２内へ引き込まれる所定量の空気と混合して、燃焼に適した空気過剰率の混合ガスとしてバーナボディ７１内部の分布室８１へ導き、さらにバーナヘッド７３裏面の炎孔７３０からガスバーナ７の外部空間へ放出するように構成している。   As shown in FIGS. 6 (a) and 6 (b), the conventional gas burner 7 includes an inner / outer double cylindrical burner body 71 and a venturi-shaped mixing extending from the distribution chamber inlet 91 of the burner body 71 to the side thereof. And a gas 72 injected from the nozzle 74 toward the gas inlet 92 of the mixing pipe 72 is mixed with a predetermined amount of air drawn into the mixing pipe 72 from the periphery of the gas inlet 92 by the venturi effect. Then, it is configured such that it is introduced into the distribution chamber 81 inside the burner body 71 as a mixed gas with an excess air ratio suitable for combustion, and further discharged from the flame hole 730 on the back surface of the burner head 73 to the external space of the gas burner 7.

特開２００２−２６７１１２号公報JP 2002-267112 A

しかしながら、上記従来のガスバーナ７では、混合管７２の長さＬ２を長く（例えば、ガスバーナ本体７０の全長Ｌ１の略１／２）設定することによって負圧形成域を確保し、混合ガスの空気過剰率を燃焼に適したレベルに維持しているから、ガスバーナ７全体が比較的大型になる問題があった。
本発明は係る点に鑑みてなされたものであり、ガスバーナ全体の小型化を図ることを課題とする。 However, in the conventional gas burner 7, the length L2 of the mixing tube 72 is set long (for example, approximately ½ of the total length L1 of the gas burner main body 70) to secure a negative pressure formation region, and excess air in the mixed gas Since the rate is maintained at a level suitable for combustion, there is a problem that the entire gas burner 7 becomes relatively large.
This invention is made | formed in view of the point which concerns, and makes it a subject to aim at size reduction of the whole gas burner.

本発明に係るガスバーナは、
内外二重筒状のバーナボディと、バーナボディの外筒周面へ繋がる混合管と、混合管のガス入口へガスを噴射するノズルとを備え、ノズルから噴射されたガスを燃焼用の空気とともに混合管を通じてバーナボディ内部のガスの分布室へ導くように構成したガスバーナにおいて、
バーナボディの外筒の内周面に開設され、混合管の内部空間と分布室とを繋ぐ分布室入口の周縁に狭通路を設け、
混合管内に送り込まれたガスと空気の混合ガスが、分布室入口から狭通路のみを通って分布室へ導かれるように構成し、
狭通路の総流路面積を分布室入口の流路面積より小さくしたことを特徴とするものである。
上記構成によれば、分布室入口の周縁に設けられた狭通路によって負圧形成域が確保されるから、混合管の長さを従来のものよりも短く設定しても、混合ガスの空気過剰率を燃焼に適したレベルで維持できる。 The gas burner according to the present invention is
It has an inner / outer double cylindrical burner body, a mixing pipe connected to the outer cylinder circumferential surface of the burner body, and a nozzle for injecting gas to the gas inlet of the mixing pipe, and the gas injected from the nozzle together with combustion air In the gas burner configured to lead to the gas distribution chamber inside the burner body through the mixing tube,
Established on the inner peripheral surface of the outer cylinder of the burner body, provided a narrow passage at the periphery of the distribution chamber inlet connecting the internal space of the mixing tube and the distribution chamber ,
The mixed gas of gas and air sent into the mixing tube is configured to be guided from the distribution chamber inlet to the distribution chamber through only the narrow passage,
The total flow path area of the narrow passage is smaller than the flow path area of the distribution chamber entrance .
According to the above configuration, since the negative pressure forming area is secured by the narrow passage provided at the periphery of the distribution chamber inlet, even if the length of the mixing tube is set shorter than that of the conventional one, the excess air of the mixed gas The rate can be maintained at a level suitable for combustion.

上記ガスバーナにおいて、バーナボディの内筒の外周面で且つ分布室入口と対向する位置に、分布室入口へ向かって隆起する凸部を設けるのが望ましい。   In the gas burner, it is desirable to provide a convex portion protruding toward the distribution chamber inlet at a position on the outer peripheral surface of the inner cylinder of the burner body and facing the distribution chamber inlet.

分布室入口へ導かれた混合ガスがバーナボディの内筒の外周面に衝突する際、その衝突部の中心に速度０の空気のよどみ点が形成され、混合管内への空気の吸込能力を低下させる。しかしながらこのものでは、分布室入口の対向位置に設けられた凸部によってよどみ点が減少し、混合ガスがスムーズに狭通路へ導かれるから、混合ガスの空気過剰率が向上する。従って、その分、混合管の長さを一層短く設定できる。   When the mixed gas introduced to the distribution chamber inlet collides with the outer peripheral surface of the inner cylinder of the burner body, a stagnation point of zero velocity air is formed at the center of the collision part, reducing the ability to suck air into the mixing tube Let However, in this case, the stagnation point is reduced by the convex portion provided at the position facing the distribution chamber inlet, and the mixed gas is smoothly guided to the narrow passage, so that the excess air ratio of the mixed gas is improved. Accordingly, the length of the mixing tube can be set shorter accordingly.

また、上記ガスバーナにおいて、バーナボディの内筒の外周面における少なくとも分布室入口と対向する領域を曲凸面状に形成するのが望ましい。   In the gas burner, it is preferable that at least a region facing the distribution chamber inlet on the outer peripheral surface of the inner cylinder of the burner body is formed in a curved convex shape.

このものでは、混合管内へ送り込まれた混合ガスが、内筒の外周面に形成された曲凸面に沿ってスムーズに狭通路へ導かれるから、混合管内への空気の吸込能力が向上する。従って、その分、混合管の長さを一層短く設定できる。   In this case, since the mixed gas fed into the mixing tube is smoothly guided to the narrow passage along the curved convex surface formed on the outer peripheral surface of the inner cylinder, the ability to suck air into the mixing tube is improved. Accordingly, the length of the mixing tube can be set shorter accordingly.

本発明は、上記構成であるから次の特有の効果を有する。
混合管の長さを従来のものよりも短く設定しても、混合ガスの空気過剰率を燃焼に適したレベルで維持できるから、ガスバーナ全体の小型化を図ることが可能である。 Since the present invention has the above configuration, the present invention has the following specific effects.
Even if the length of the mixing tube is set shorter than that of the conventional one, the excess air ratio of the mixed gas can be maintained at a level suitable for combustion, so that the entire gas burner can be reduced in size.

本発明の実施の形態に係るガスバーナの縦断面概略図（ａ）およびＸ−Ｘ断面概略図（ｂ）。The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on embodiment of this invention. 本発明の実施の形態に係るガスバーナにおける狭通路の幅と空気過剰率との関係を示すグラフ。The graph which shows the relationship between the width | variety of a narrow passage and the excess air ratio in the gas burner which concerns on embodiment of this invention. 本発明の他の実施形態に係るガスバーナの縦断面概略図（ａ）およびＸ−Ｘ断面概略図（ｂ）。The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on other embodiment of this invention. 本発明の他の実施形態に係るガスバーナの縦断面概略図（ａ）およびＸ−Ｘ断面概略図（ｂ）。The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on other embodiment of this invention. 本発明の他の実施形態に係るガスバーナの縦断面概略図。The longitudinal cross-sectional schematic of the gas burner which concerns on other embodiment of this invention. 従来のガスバーナの縦断面概略図（ａ）およびＹ−Ｙ断面概略図（ｂ）。The longitudinal cross-sectional schematic diagram (a) and YY cross-sectional schematic diagram (b) of the conventional gas burner.

次に、上記した本発明を実施するための形態について、添付図面を参照しながら詳述する。
図１（ａ）および（ｂ）に示すように、本発明の実施の形態に係るガスバーナ１は、ガスコンロに組み込まれる外炎式のバーナであって、主として、内外二重円筒状のバーナボディ１１と、そのバーナボディ１１の外側壁に一体形成されるベンチュリ管状の混合管１２と、バーナボディ１１の上部に載置される環状のバーナヘッド１３と、図示しないガス配管から供給されるガスを混合管１２内へ噴射するノズル１４とで構成されている。 Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 (a) and 1 (b), a gas burner 1 according to an embodiment of the present invention is an external flame type burner incorporated in a gas stove, and mainly an inner / outer double cylindrical burner body 11. A venturi-shaped mixing tube 12 integrally formed on the outer wall of the burner body 11, an annular burner head 13 mounted on the upper portion of the burner body 11, and a gas supplied from a gas pipe (not shown) The nozzle 14 injects into the pipe 12.

バーナボディ１１内には、内筒１１ａと外筒１１ｂとで囲まれた環状のガスの通路（以下、「分布室」という）２１が形成されている。この分布室２１は、バーナボディ１１の上部開口３０を介してバーナヘッド１３の外周縁の裏面に形成された炎孔１３０へ繋がっている一方、外筒１１ｂの内周面で且つ外筒１１ｂの上下間の略中央位置に開設された分布室入口３１を介して混合管１２の内部空間（以下、「混合路」という）２２へ繋がっている。   An annular gas passage (hereinafter referred to as “distribution chamber”) 21 surrounded by the inner cylinder 11 a and the outer cylinder 11 b is formed in the burner body 11. This distribution chamber 21 is connected to the flame hole 130 formed on the back surface of the outer peripheral edge of the burner head 13 through the upper opening 30 of the burner body 11, while it is the inner peripheral surface of the outer cylinder 11b and the outer cylinder 11b. It is connected to the internal space (hereinafter referred to as “mixing path”) 22 of the mixing pipe 12 via a distribution chamber inlet 31 established at a substantially central position between the upper and lower sides.

混合管１２のガス入口３２は、ノズル１４の先端に対峙しており、ノズル１４からガス入口３２へ向けてガスが噴射されると、その噴射されたガスは、混合路２２を通って分布室入口３１側へ送り込まれる。また、混合路２２内へガスが送り込まれると、その混合路２２におけるベンチュリ効果によって混合路２２内が負圧となり、ガス入口３２周辺の空気が上記ガスとともに混合路２２内へ引き込まれる。そして、このガスと空気の混合ガスが、分布室入口３１から後述する狭通路２３を通って分布室２１へ導かれ、さらにその上方の炎孔１３０からバーナボディ１１の外周へ放出される。   The gas inlet 32 of the mixing tube 12 faces the tip of the nozzle 14. When gas is injected from the nozzle 14 toward the gas inlet 32, the injected gas passes through the mixing path 22 and is distributed. It is sent to the inlet 31 side. When the gas is fed into the mixing path 22, the mixing path 22 has a negative pressure due to the venturi effect in the mixing path 22, and the air around the gas inlet 32 is drawn into the mixing path 22 together with the gas. Then, this mixed gas of gas and air is guided from the distribution chamber inlet 31 to the distribution chamber 21 through a narrow passage 23 described later, and further discharged from the flame hole 130 thereabove to the outer periphery of the burner body 11.

分布室入口３１の外周には、分布室２１へ繋がり、且つ、分布室入口３１より流路面積の小さい負圧形成部としての狭通路２３が延設されている。具体的には、内筒１１ａの外周面で且つ分布室入口３１と対向する所定領域には、分布室入口３１より投影面積の広い平面状の起立壁（以下、「内筒平面部」という）１５Ａが形成されている一方、外筒１１ｂの内周面で且つ上記内筒平面部１５Ａと対向する所定領域には、内筒平面部１５Ａより広幅の平面部（以下、「外筒平面部」という）１５Ｂが形成されており、分布室入口３１は、この外筒平面部１５Ｂの略中心部に開設されている。分布室２１は、この分布室入口３１の外周側に形成された内筒平面部１５Ａと外筒平面部１５Ｂとの間隙（狭通路）２３の終端で繋がっており、連通路２２内へ送り込まれたガスと空気の混合ガスは、分布室入口３１からその周方向へ延びる狭通路２３を通って分布室２１へ導かれる。   On the outer periphery of the distribution chamber inlet 31, a narrow passage 23 is extended as a negative pressure forming portion that is connected to the distribution chamber 21 and has a smaller flow area than the distribution chamber inlet 31. Specifically, in a predetermined region on the outer peripheral surface of the inner cylinder 11 a and facing the distribution chamber inlet 31, a planar standing wall having a larger projected area than the distribution chamber inlet 31 (hereinafter referred to as “inner cylinder plane portion”). 15A is formed on the inner peripheral surface of the outer cylinder 11b and in a predetermined region facing the inner cylinder plane part 15A, a plane part wider than the inner cylinder plane part 15A (hereinafter referred to as “outer cylinder plane part”). 15B is formed, and the distribution chamber inlet 31 is formed at a substantially central portion of the outer cylinder flat portion 15B. The distribution chamber 21 is connected at the end of a gap (narrow passage) 23 between the inner cylinder flat portion 15A and the outer cylinder flat portion 15B formed on the outer peripheral side of the distribution chamber inlet 31, and is sent into the communication passage 22. The mixed gas of air and air is led to the distribution chamber 21 through the narrow passage 23 extending in the circumferential direction from the distribution chamber inlet 31.

また、本実施の形態では、分布室入口３１の直径Ｄ２が略１３ｍｍ、狭通路２３の幅Ｗ３が略３ｍｍに設定されており、分布室入口３１の流路面積に比べて、分布室入口３１外周の狭通路２３の流路面積の方が小さくなっている。従って、混合路２２内へ送り込まれた混合ガスが分布室入口３１から狭通路２３へ流れる際には、その狭通路２３におけるベンチュリ効果によって混合路２２内がさらに負圧となり、ガス入口３２から混合路２２への空気の吸込能力が向上する。即ち、分布室入口３１の周方向へ狭通路２３を延設することによって負圧形成域を確保し、混合路２２への空気の吸込能力を向上させている。   In the present embodiment, the diameter D2 of the distribution chamber inlet 31 is set to about 13 mm, and the width W3 of the narrow passage 23 is set to about 3 mm. Compared to the flow area of the distribution chamber inlet 31, the distribution chamber inlet 31 is set. The flow path area of the outer narrow passage 23 is smaller. Therefore, when the mixed gas fed into the mixing passage 22 flows from the distribution chamber inlet 31 to the narrow passage 23, the inside of the mixing passage 22 becomes further negative pressure due to the venturi effect in the narrow passage 23, and is mixed from the gas inlet 32. The ability to suck air into the passage 22 is improved. That is, by extending the narrow passage 23 in the circumferential direction of the distribution chamber inlet 31, a negative pressure forming region is secured, and the ability to suck air into the mixing passage 22 is improved.

尚、図２は、狭通路２３の幅Ｗ３と空気過剰率との関係を示すグラフである。このグラフから分かるように、混合ガスの空気過剰率は、狭通路２３の幅Ｗ３を略３ｍｍに設定した場合に最も高く、燃焼に適した値に近くなる。   FIG. 2 is a graph showing the relationship between the width W3 of the narrow passage 23 and the excess air ratio. As can be seen from this graph, the excess air ratio of the mixed gas is highest when the width W3 of the narrow passage 23 is set to about 3 mm, and is close to a value suitable for combustion.

そこで、本実施の形態では、混合管１２の長さ、即ち、ガス入口３２から分布室入口３１までの長さＬ２を略３５ｍｍ（ガスバーナ本体１０の全長Ｌ１の略２／５）に設定した。   Therefore, in the present embodiment, the length of the mixing tube 12, that is, the length L2 from the gas inlet 32 to the distribution chamber inlet 31 is set to about 35 mm (about 2/5 of the total length L1 of the gas burner body 10).

このように、上記実施の形態に係るガスバーナ１では、分布室入口３１の周方向へ延設された狭通路２３によって負圧形成域を確保し、混合路２２への空気の吸込能力を向上させているから、混合管１２の長さを従来のものよりも短く設定しても、混合ガスの空気過剰率を燃焼に適したレベルで維持できる。これにより、ガスバーナ１全体の小型化を図ることが可能となる。   As described above, in the gas burner 1 according to the above-described embodiment, the negative pressure forming region is secured by the narrow passage 23 extending in the circumferential direction of the distribution chamber inlet 31, and the ability to suck air into the mixing passage 22 is improved. Therefore, even if the length of the mixing tube 12 is set shorter than the conventional one, the excess air ratio of the mixed gas can be maintained at a level suitable for combustion. As a result, the gas burner 1 as a whole can be downsized.

［他の実施形態］
尚、上記実施の形態における内筒平面部１５Ａは、単純平面状に形成されているが、図３（ａ）および（ｂ）に示すように、内筒平面部１５Ａ上における分布室入口３１との対向位置で且つ分布室入口３１の中心線上に、分布室入口３１へ向かって隆起する球面山型の凸部１６を設けても良い。 [Other Embodiments]
In addition, although the inner cylinder plane part 15A in the said embodiment is formed in simple plane shape, as shown to Fig.3 (a) and (b), the distribution chamber inlet_port | entrance 31 on the inner cylinder plane part 15A and A spherical mountain-shaped convex portion 16 that protrudes toward the distribution chamber inlet 31 may be provided on the center line of the distribution chamber inlet 31.

このものでは、分布室入口３１から内筒平面部１５Ａへ向かって送り出された混合ガスが、凸部１６の表面に沿ってスムーズに狭通路２３へ導かれるから、混合路２２への空気の吸込能力が向上する。従って、その分、混合管１２の長さを一層短く設定できる。   In this case, since the mixed gas sent out from the distribution chamber inlet 31 toward the inner cylinder flat portion 15A is smoothly guided to the narrow passage 23 along the surface of the convex portion 16, air is sucked into the mixing passage 22. Ability improves. Accordingly, the length of the mixing tube 12 can be set to be shorter accordingly.

また、上記実施の形態では、内筒１１ａの外周面に内筒平面部１５Ａを形成する一方、外筒１１ｂの内周面に外筒平面部１５Ｂを形成し、この内筒平面部１５Ａに対向する外筒平面部１５Ｂの略中心部に分布室２１を開設したが、図４（ａ）および（ｂ）に示すように、内筒１１ａの外周面で且つ分布室入口３１と対向する所定領域に、分布室入口３１より投影面積の広い曲凸状の起立壁（以下、「内筒凸面部」という）１７Ａを形成する一方、外筒１１ｂの内周面で且つ内筒凸面部１７Ａに沿って対向する所定領域に、内筒凸面部１７Ａより広幅の曲凹面部（以下、「外筒凹面部」という）１７Ｂを形成し、この内筒凸面部１７Ａに対向する外筒凹面部１７Ｂの略中心部に分布室入口３１を開設したものであっても良い。   Moreover, in the said embodiment, while forming the inner cylinder plane part 15A in the outer peripheral surface of the inner cylinder 11a, the outer cylinder plane part 15B is formed in the inner peripheral surface of the outer cylinder 11b, and this inner cylinder plane part 15A is opposed. The distribution chamber 21 is opened at substantially the center of the outer cylinder flat surface portion 15B. As shown in FIGS. 4A and 4B, a predetermined region facing the distribution chamber inlet 31 on the outer peripheral surface of the inner cylinder 11a. In addition, a curved raised wall (hereinafter referred to as an “inner cylinder convex surface portion”) 17A having a projection area wider than that of the distribution chamber inlet 31 is formed, and on the inner peripheral surface of the outer cylinder 11b and along the inner cylinder convex surface portion 17A. A curved concave surface portion (hereinafter referred to as “outer cylindrical concave surface portion”) 17B wider than the inner cylindrical convex surface portion 17A is formed in a predetermined region facing each other, and the abbreviation of the outer cylindrical concave surface portion 17B facing the inner cylindrical convex surface portion 17A. A distribution room entrance 31 may be opened in the center.

このものでは、分布室入口３１から内筒凸面部１７Ａへ向かって送り出される混合ガスが、その内筒凸面部１７Ａに沿ってスムーズに狭通路２３へ導かれるから、混合路２２への空気の吸込能力が向上する。従って、その分、混合管１２の長さを一層短く設定できる。   In this case, since the mixed gas sent from the distribution chamber inlet 31 toward the inner cylindrical convex surface portion 17A is smoothly guided to the narrow passage 23 along the inner cylindrical convex surface portion 17A, air is sucked into the mixing passage 22 Ability improves. Accordingly, the length of the mixing tube 12 can be set to be shorter accordingly.

さらに、上記内筒凸面部１７Ａ上における分布室入口３１との対向位置で且つ分布室入口３１の中心線上に、上記他の実施形態で説明した球面山型の凸部１６を設けることによって（図４（ａ）および（ｂ）参照）、混合路２２への空気の吸込能力が一層向上するから、その分、混合管１２の長さを一層短く設定できる。   Furthermore, by providing the spherical mountain-shaped convex portion 16 described in the other embodiment on the inner cylinder convex surface portion 17A at a position facing the distribution chamber inlet 31 and on the center line of the distribution chamber inlet 31 (FIG. 4 (a) and (b)), the ability to suck air into the mixing path 22 is further improved, and accordingly, the length of the mixing pipe 12 can be set shorter.

また、上記各実施形態では、分布室入口３１を外筒１１ｂの上下間の略中央位置に設けたが、図５に示すように、外筒１１ｂの下辺位置に設けても良い。   In each of the above embodiments, the distribution chamber inlet 31 is provided at a substantially central position between the upper and lower sides of the outer cylinder 11b. However, as shown in FIG. 5, it may be provided at a lower side position of the outer cylinder 11b.

このものでは、分布室２１内へ少量の煮こぼれが流れ込んでも、速やかに混合路２２からガスバーナ１外へ排出されるから、バーナヘッド１１内に汚れが蓄積し難い。   In this case, even if a small amount of spilled water flows into the distribution chamber 21, it is quickly discharged out of the gas burner 1 from the mixing path 22, so that dirt does not easily accumulate in the burner head 11.

１・・・ガスバーナ
１１・・・バーナボディ
１１ａ・・・内筒
１１ｂ・・・外筒
１２・・・混合管
１３・・・バーナヘッド
１４・・・ノズル
２１・・・分布室
２２・・・混合路
２３・・・狭通路
３１・・・分布室入口
３２・・・ガス入口 DESCRIPTION OF SYMBOLS 1 ... Gas burner 11 ... Burner body 11a ... Inner cylinder 11b ... Outer cylinder 12 ... Mixing tube 13 ... Burner head 14 ... Nozzle 21 ... Distribution chamber 22 ... Mixing path 23 ... narrow passage 31 ... distribution chamber inlet 32 ... gas inlet

Claims (3)

内外二重筒状のバーナボディと、バーナボディの外筒周面へ繋がる混合管と、混合管のガス入口へガスを噴射するノズルとを備え、ノズルから噴射されたガスを燃焼用の空気とともに混合管を通じてバーナボディ内部のガスの分布室へ導くように構成したガスバーナにおいて、
バーナボディの外筒の内周面に開設され、混合管の内部空間と分布室とを繋ぐ分布室入口の周縁に狭通路を設け、
混合管内に送り込まれたガスと空気の混合ガスが、分布室入口から狭通路のみを通って分布室へ導かれるように構成し、
狭通路の総流路面積を分布室入口の流路面積より小さくしたことを特徴とする、ガスバーナ。 It has an inner / outer double cylindrical burner body, a mixing pipe connected to the outer cylinder circumferential surface of the burner body, and a nozzle for injecting gas to the gas inlet of the mixing pipe, and the gas injected from the nozzle together with combustion air In the gas burner configured to lead to the gas distribution chamber inside the burner body through the mixing tube,
Established on the inner peripheral surface of the outer cylinder of the burner body, provided a narrow passage at the periphery of the distribution chamber inlet connecting the internal space of the mixing tube and the distribution chamber ,
The mixed gas of gas and air sent into the mixing tube is configured to be guided from the distribution chamber inlet to the distribution chamber through only the narrow passage,
A gas burner characterized in that the total flow passage area of the narrow passage is made smaller than the flow passage area of the distribution chamber entrance . 請求項１に記載のガスバーナにおいて、
バーナボディの内筒の外周面で且つ分布室入口と対向する位置に、分布室入口へ向かって隆起する凸部を設けたことを特徴とする、ガスバーナ。 The gas burner according to claim 1,
A gas burner, characterized in that a convex portion protruding toward the distribution chamber inlet is provided at a position on the outer peripheral surface of the inner cylinder of the burner body and facing the distribution chamber inlet. 請求項１または２に記載のガスバーナにおいて、
バーナボディの内筒の外周面における少なくとも分布室入口と対向する領域を曲凸面状に形成したことを特徴とする、ガスバーナ。 The gas burner according to claim 1 or 2,
A gas burner characterized in that at least a region facing the distribution chamber inlet on the outer peripheral surface of the inner cylinder of the burner body is formed in a curved convex shape.
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