JP2004333018A

JP2004333018A - Range burner

Info

Publication number: JP2004333018A
Application number: JP2003129960A
Authority: JP
Inventors: Koichi Koto; 公一光藤; Akihiro Miura; 晃裕三浦
Original assignee: Paloma Kogyo KK
Current assignee: Paloma Kogyo KK
Priority date: 2003-05-08
Filing date: 2003-05-08
Publication date: 2004-11-25

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a minimum input by improving the flame holding property in adjusting the firepower from strong firepower to weak firepower. <P>SOLUTION: As an outer peripheral face of a flame hole part 30 and a non-flame hole part 22 are vertically divided, and throats 24a, 24b are respectively formed thereon to hold the flame, the flame can be held in a state of being divided into the upper flame on the basis of an upper edge (a) and a step part (c) of the outer peripheral face and the lower flame part on the basis of a lower end (b) and the step part (c), even when the input is further reduced in comparison with the determined input of the minimum firepower, in changing the pressure when the firepower is quickly adjusted from the strong firepower to the weak firepower. As the flame holding property in the change of pressure where the input is reduced to be less than the minimum firepower, is improved, the minimum input can be set small, the turn-down performance can be improved, and a burner of high usability can be provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、調理用こんろに用いるこんろバーナに関する。
【０００２】
【従来の技術】
従来、この種のこんろバーナ１０１は、図８に示されるように、バーナ本体１１０の上にバーナヘッド１２０を脱着自在に載置することによって、その外周面に多数の炎口１０２を形成している。そして、近年では、環境問題などへの関心の高まりから、調理用こんろにおいても熱効率を向上させることが望まれている。
調理用こんろの熱効率を向上させる方法の一つとして、こんろバーナと鍋底との距離を縮めることにより、火炎と鍋底との接触面積を大きくして伝熱面積を大きくする方法が知られているが、この結果として燃焼が悪化することから一次空気の量を増やす対策が採られる。
【０００３】
ところが、燃焼性能を向上させるために一次空気を増やすと、混合ガスの流速が上がり、炎がリフトしやすくなるという問題が生じてくる。そこで、特許文献１では、図８に示されるように、炎口部の外周面の途中に保炎用の鍔１５０を設けて火炎のリフトを防止するこんろバーナ１０１が提案されている。
このようなこんろバーナ１０１では、炎口１０２から噴出するガスの流れが鍔１５０により火炎の基端部において乱され渦流状となるために最適な保炎性が確保され炎口１０２に形成される火炎のリフトは抑えられる。
また、炎口部に形成される火炎は最小インプット（インプット：単位時間当たりの燃料ガス供給量（ｋｃａｌ／ｈ））の際には、図８に示されるように、外周面の上端ａと下端ｂとが基部となり保炎される。
【０００４】
【特許文献１】
特開２００１−２４８８０９号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、強火力から弱火力にすばやく火力調節すると、供給ガス圧の圧力変動により一瞬最小インプットより小さいインプットとなり、図９に示すように、火炎が内側にへっこんで鍔１５０にぶつかって吹き消えてしまう。
そこで、最小インプット量を圧力変動時にａ−ｂ間で火炎を保持できるように設定している。このため、最小インプット量はａ−ｂを基部として保炎できる最小ガス量よりも大きくせざるを得なかった。すなわち、保炎性を高めるために最小インプットを上げて対応せざるを得なかった。
本発明のこんろバーナは上記課題を解決し、強火力から弱火力へ火力調節した時の保炎性を向上させ、最小インプットを小さく設定できるようにすることを目的とする。
【０００６】
【課題を解決するための手段】
上記課題を解決する本発明の請求項１記載のこんろバーナは、
バーナヘッドの円筒状外周面に多数の炎口を形成するとともに、該バーナヘッドの上方全周にわたって該炎口部への煮汁等の滴下を防止するひさし部が形成されたこんろバーナにおいて、
上記炎口部の外周面の下部を上部よりも内側にくぼませて形成することにより上部と下部との間に段差部を設けるとともに、該外周面の上部を上方ほど内側となるように傾斜させることによって、該外周面の上部には該上部外周面と上記ひさし部とで囲まれた保炎用の上ふところを、該外周面の下部には該下部外周面と該段差部とで囲まれた保炎用の下ふところを形成したことを要旨とする。
【０００７】
また、本発明の請求項２記載のこんろバーナは、上記請求項１記載のこんろバーナにおいて、
上記ひさし部の直径は、上記炎口部の外周面の最大外径よりも大きいことを要旨とする。
【０００８】
また、本発明の請求項３記載のこんろバーナは、上記請求項１または２記載のこんろバーナにおいて、
上記炎口部の炎口配列の途中に排気逃し用の無炎口部を設け、該排気逃し用無炎口部の上記段差部より下方にのみ火移り炎口を設けるとともに、該火移り炎口上の上記段差部から下方に延びる垂れ下がり部を形成したことを要旨とする。
【０００９】
上記構成を有する本発明の請求項１記載のこんろバーナは、炎口部の外周面を上下に分割してそれぞれに火炎を保炎できるふところを設けているため、強火から弱火へのすばやい火力調節時にインプットが設定値の最小インプットよりも小さくなっても、火炎を一瞬上下に分割しそれぞれのふところで保炎することができる。すなわち、強火力から弱火力へ火力調節する圧力変動時にインプットが最小インプットよりも小さくなった時には、上端と段差部とを基部とする上部炎と、下端と段差部とを基部とする下部炎とに火炎を分割して保持する。従って、インプットが最小火力時よりも小さくなる圧力変動時の保炎性が向上するため、最小インプットを小さく設定できこんろバーナのターンダウン性能が向上する。
【００１０】
また、外周面の上部を上方ほど内側となるように傾斜させて、上ふところをその縦断面が三角形状となるようにしたため、上ふところと下ふところは、共通の段差部を基部として分割炎を保持するので、圧力変動時に内側にへっこんできた火炎を上下に分割しやすく、しかも分割された上下の火炎がこの段差部で互いに保炎しあって吹き消えることを確実に防止できる。
さらに、外周面の上部を上方ほど内側となるように傾斜させているため、ひさし部と上部外周面とで囲まれる上ふところが鋭角となり火炎の保持力が一層向上する。
【００１１】
また、本発明の請求項２記載のこんろバーナは、炎口部の外周面の上方に外周面の最大外径よりも大きな径のひさし部を設けているので、炎口部への煮汁等の滴下を確実に防止できるだけでなく、上ふところをより大きく形成することができ火炎分割時の保持力が一層大きくなる。
【００１２】
また、本発明の請求項３記載のこんろバーナは、火移り炎口上に段差部から下方に伸びる垂れ下がり部を形成することによって、火移り炎口部の下ふところが狭くなり、この狭い下ふところから燃料ガスが広い空間へと噴出するため大きな減速効果が生じるので、火移り炎のリフトを抑制できる。このため、常に良好な火移り炎を形成でき火力を絞った時でも安定した火移りを行える。
【００１３】
【発明の実施の形態】
以上説明した本発明の構成・作用を一層明らかにするために、以下本発明のこんろバーナの好適な実施形態について、図１〜図７を用いて説明する。
【００１４】
こんろバーナ１は、図１に示されるように、燃料ガスと一次空気を混合するリング状の混合部１１を有するバーナ本体１０と、このバーナ本体１０の上に載置されるバーナヘッド２０とからなる。
バーナ本体１０の混合部１１は、ガスノズル４から燃料ガスが供給されるスロート部１２と連通している。バーナヘッド２０の中央には、円筒部２７が形成される。また、バーナ本体１０の混合部１１を形成する円筒状の内壁は、燃焼時の二次空気通路を兼ねたバーナヘッド２０の位置決めガイド１３となり、バーナヘッド２０の円筒部２７はこの位置決めガイド１３に挿入される。バーナヘッド２０の円筒部２７の外周には、リング状に混合空間２８が設けられており、バーナヘッド２０をバーナ本体１０に載置すると、混合部１１と混合空間２８とが一体となって環状混合気室４０を形成する。
【００１５】
バーナヘッド２０の円筒状外周面には多数の炎口溝２１が放射状に所定ピッチで形成されており、バーナヘッド２０をバーナ本体１０に載置することにより円筒状外周面に多数の炎口２が放射状に形成される。また、図２に示されるように、炎口溝２１の配列の途中に（例えば、４個おきに）、炎口２での火炎により発生した燃焼排気を外部へ排出するための排気逃し用無炎口部２２が形成される。尚、スロート部１２の基端部に設けられたガスノズル４のまわりには、燃料ガスの噴出に伴って燃焼用一次空気を吸引する一次空気吸入口１４が形成される。
【００１６】
多数の炎口２が配列された炎口部３０と排気逃し用無炎口部２２の外周面は、その下部を上部よりも内側にくぼませて形成することによって、上部と下部との間に段差部２３を設けている。また、外周面の上部は、上方ほど内側となるように斜め上向きに傾斜させる。従って、外周面は、上部外周面６０ａと下部外周面６０ｂとに上下に分割される。
また、炎口部３０と無炎口部２２の外周面の上方、すなわち、バーナヘッド２０の最上部には全周にわたってひさし部２６が形成される。このひさし部２６の直径は、外周面の最大外径（段差部２３）よりも大きい。
従って、外周面の上側には、上部外周面６０ａとひさし部２６とで囲まれた縦断面が三角形状の保炎用の上ふところ２４ａが、下側には、下部外周面６０ｂと段差部２３とで囲まれた保炎用の下ふところ２４ｂが形成される。
【００１７】
無炎口部２２には、図２に示されるように、火移り炎口５が設けられる。この火移り炎口５は、段差部２３よりも下方に設けられ、火移り炎口５上の段差部２３からは下方に伸びる垂れ下がり部２５が形成される。
【００１８】
上述したこんろバーナ１によれば、炎口部３０と無炎口部２２の外周面を上下に分割してそれぞれに火炎を保炎できるふところ２４ａ，２４ｂ（上ふところ２４ａと下ふところ２４ｂ）を形成しているため、強火から弱火への火力調節時にインプットが設定値の最小インプットよりも小さくなった際には、火炎を一瞬上下に分割し上ふところ２４ａと下ふところ２４ｂで保炎することができる。すなわち、最小火力時には、図１に示すように、外周面の上端ａと下端ｂとを基部として火炎を保持するが、強火力から弱火力へすばやく火力調節した圧力変動時にインプットがさらに小さくなっても、図３に示すように、上端ａと段差部ｃとを基部とする上部炎と、下端ｂと段差部ｃとを基部とする下部炎とに火炎を分割して保持できる。
【００１９】
このような火力調節時の火炎の変化について図４〜図６を用いて詳述する。
強火力時には、図４に示すように、外周面の上端ａと下端ｂとを基部として大きな火炎が保持される。そして、弱火力へとすばやく火力調節すると、一瞬インプットが設定値の最小インプットよりも小さくなって火炎が内側にへっこむが、この際は、図５に示すように、小さな火炎を上下に分割して、上部炎を上端ａと段差部ｃとを基部として上ふところ２４ａで保持し、下部炎を下端ｂと段差部ｃとを基部として下ふところ２４ｂで保持する。弱火力になると、図６に示すように、上端ａと下端ｂとを基部として小さな火炎が保持される。
従って、インプットが最小火力時よりも小さくなる圧力変動時の保炎性が向上するため、最小インプットを小さく設定できターンダウン性能が向上し使い勝手の良いこんろバーナとなる。
【００２０】
また、外周面の上部を上方ほど内側となるように傾斜させて、上ふところ２４ａをその縦断面が三角形状のくぼみとなるようにしたため、上ふところ２４ａと下ふところ２４ｂは、共通の段差部２３を基部として分割炎を保持するので、圧力変動時に内側にへっこんできた火炎を上下に分割しやすく、しかも分割された上下の火炎がこの段差部２３で互いに保炎しあって吹き消えることを確実に防止できる。
また、外周面の上部を上方ほど内側となるように傾斜させることによって上ふところ２４ａを大きく形成し、外周面の下部を上部よりも内側にくぼませることによって下ふところ２４ｂを大きく形成しているため、火炎分割時の保持力が大きなものとなる。
さらに、炎口部３０の外周面の上方に外周面の最大外径よりも大きな径のひさし部２６を設けているので、炎口部３０への煮汁等の滴下を確実に防止できるだけでなく、上ふところ２４ａをより大きく形成することができ火炎分割時の保持力が一層大きくなる。
さらに、外周面の上部を上方ほど内側となるように傾斜させているため、ひさし部２６と上部外周面６０ａとで囲まれる上ふところ２４ａが鋭角となり火炎の保持力が向上する。
また、外周面の上部を上方ほど内側となるように傾斜させて、炎口面を斜め上向きに形成して炎口面を燃料ガスの噴出方向と直交する側に傾けているため、炎口出口面積を小さくできより一層保炎性能が向上する。
【００２１】
尚、火力調整操作していない一定火力である強火力時や中火力時においては、炎口２から噴出するガスの流れが段差部２３により火炎の基端部において乱され渦流状となるために最適な保炎性が確保され炎口２に形成される火炎のリフトは抑制される。
【００２２】
また、火移り炎口５上に段差部２３から下方に伸びる垂れ下がり部２５を形成しているため、火移り炎口部の下ふところ２４ｂが狭くなり、この狭い下ふところ２４ｂから燃料ガスが広い空間へと噴出するため大きな減速効果が生じるので、火移り炎のリフトを抑制できる。このため、常に良好な火移り炎を形成でき火力を絞った時でも安定した火移りを行える。ところで、段差部２３全体にわたって垂れ下がり部２５を形成すると燃焼空間が狭くなりすぎ、酸欠のために燃焼性能が悪化してしまうが、本実施形態のこんろバーナ１では、段差部２３の一部に設けているだけなので燃焼状態を良好に維持できる。
また、こんろバーナ１には、図示しない火炎検出用の熱電対が炎口２と向かい合って設けられており、図７に示すように、この熱電対と向かい合う段差部２３に火移り炎口５上の段差部２３と同様に、下方に伸びる垂れ下がり部２５を形成してそこでの火炎のリフトを防止して熱電対を常に安定して加熱できるようにしている。尚、図７中では、×印で熱電対の感温部の設置位置を示した。
【００２３】
また、炎口部３０と無炎口部２２の外周面の上方全周にわたって外周面の最大外径よりも径の大きなひさし部２６を設けているので、煮汁等が炎口２に滴り落ちて炎口詰まりをおこすことを防止できる。本実施形態のこんろバーナ１では、外周面の上部を内側に傾斜させており、煮汁等が炎口２内に侵入しやすいが、このひさし部２６により炎口２への滴下を確実に防止できる。
【００２４】
以上本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。
【００２５】
【発明の効果】
以上詳述したように、本発明の請求項１記載のこんろバーナによれば、強火力から弱火力へすばやく火力調節する圧力変動時にインプットが最小火力の設定インプットよりもさらに小さくなっても、外周面の上端と段差部とを基部とする上部炎と、下端と段差部とを基部とする下部炎とに火炎を分割して保持できる。従って、インプットが最小火力時よりも小さくなる圧力変動時の保炎性が向上するため、最小インプットを小さく設定できターンダウン性能が向上し使い勝手の良いこんろバーナとなる。
【００２６】
更に、本発明の請求項２記載のこんろバーナによれば、炎口部の外周面の上方に外周面の最大外径よりも大きな径のひさし部を設けているので、炎口部への煮汁等の滴下を確実に防止できるだけでなく、上ふところをより大きく形成することができ火炎分割時の保持力を一層大きくできる。
【００２７】
更に、本発明の請求項３記載のこんろバーナによれば、火移り炎口上に段差部から下方に伸びる垂れ下がり部を形成することによって、火移り炎口部の下ふところを狭くして大きな減速効果を生じさせることが可能となり、火移り炎のリフトを抑制できる。このため、常に良好な火移り炎を形成でき火力を絞った時でも安定した火移りを行える。
【図面の簡単な説明】
【図１】本実施形態としてのこんろバーナの断面図である。（弱火力時）
【図２】炎口部及び無炎口部の拡大正面図である。
【図３】本実施形態としてのこんろバーナの断面図である。（圧力変動時）
【図４】本実施形態としてのこんろバーナの炎口付近の拡大図である。（強火力時）
【図５】本実施形態としてのこんろバーナの炎口付近の拡大図である。（圧力変動時）
【図６】本実施形態としてのこんろバーナの炎口付近の拡大図である。（弱火力時）
【図７】熱電対取付位置の説明図である。
【図８】従来例としてのこんろバーナの断面図である。（弱火力時）
【図９】従来例としてのこんろバーナの断面図である。（圧力変動時）
【符号の説明】
１…こんろバーナ、２…炎口、５…火移り炎口、１０…バーナ本体、２０…バーナヘッド、２２…無炎口部、２３…段差部、２４ａ…上ふところ、２４ｂ…下ふところ、２５…垂れ下がり部、２６…ひさし部、３０…炎口部、６０ａ…上部外周面、６０ｂ…下部外周面。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stove burner used for cooking stoves.
[0002]
[Prior art]
Conventionally, as shown in FIG. 8, this type of stove burner 101 has a large number of flame ports 102 formed on the outer peripheral surface thereof by mounting a burner head 120 on a burner main body 110 in a detachable manner. ing. In recent years, due to increasing interest in environmental issues and the like, it has been desired to improve the thermal efficiency of cooking stoves.
As one method of improving the thermal efficiency of cooking stoves, there is known a method of increasing the heat transfer area by shortening the distance between the stove burner and the pot bottom, thereby increasing the contact area between the flame and the pot bottom. However, as a result, combustion deteriorates, and measures are taken to increase the amount of primary air.
[0003]
However, if the primary air is increased to improve the combustion performance, there arises a problem that the flow rate of the mixed gas increases and the flame is easily lifted. In view of this, Patent Document 1 proposes a burner 101 that provides a flame retaining flange 150 in the middle of the outer peripheral surface of a flame opening to prevent a flame lift, as shown in FIG.
In such a stove burner 101, the flow of gas ejected from the flame outlet 102 is disturbed at the base end of the flame by the flange 150, and becomes a vortex shape. The flame lift is reduced.
In addition, when the flame formed in the flame outlet is at the minimum input (input: fuel gas supply amount per unit time (kcal / h)), as shown in FIG. b serves as a base, and the flame is held.
[0004]
[Patent Document 1]
JP 2001-248809 A
[Problems to be solved by the invention]
However, when the heating power is quickly adjusted from the high heating power to the low heating power, the input momentarily becomes smaller than the minimum input due to the pressure fluctuation of the supply gas pressure, and as shown in FIG. Would.
Therefore, the minimum input amount is set so that the flame can be maintained between a and b when the pressure fluctuates. For this reason, the minimum input amount has to be larger than the minimum gas amount that can hold the flame based on ab. That is, in order to enhance the flame holding property, the minimum input had to be increased to cope with the problem.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to improve the flame holding ability when the heating power is adjusted from a high heating power to a low heating power, so that the minimum input can be set small.
[0006]
[Means for Solving the Problems]
The stove burner according to claim 1 of the present invention which solves the above-mentioned problems,
In the stove burner formed with a number of flame ports on the cylindrical outer peripheral surface of the burner head, and an eave portion for preventing dripping of boiling water and the like to the flame port portion over the entire periphery of the burner head,
By forming the lower part of the outer peripheral surface of the flame opening part inwardly from the upper part to form a step between the upper part and the lower part, the upper part of the outer peripheral surface is inclined such that the upper part becomes more inward toward the upper part. Thus, the upper part of the outer peripheral surface is surrounded by an upper flame holding portion surrounded by the upper outer peripheral surface and the eave portion, and the lower part of the outer peripheral surface is surrounded by the lower outer peripheral surface and the step portion. The gist of the present invention is that a lower frame for flame holding is formed.
[0007]
The stove burner according to the second aspect of the present invention is the stove burner according to the first aspect,
The gist is that the diameter of the eaves portion is larger than the maximum outer diameter of the outer peripheral surface of the flame port portion.
[0008]
In addition, according to a third aspect of the present invention, there is provided a stove burner according to the first or second aspect,
A non-flame outlet for exhaust relief is provided in the middle of the flame port arrangement of the flame outlet, and a flash-fire flame is provided only below the stepped portion of the non-flame vent for exhaust relief. The gist is that a hanging portion extending downward from the step portion on the mouth is formed.
[0009]
The stove burner according to claim 1 of the present invention having the above-described structure, since the outer peripheral surface of the flame opening is divided into upper and lower portions, and each of the portions is provided with a flame that can hold a flame. Even if the input becomes smaller than the minimum input of the set value during the adjustment, the flame can be split up and down for a moment and held at each end. That is, when the input becomes smaller than the minimum input during the pressure change for adjusting the heating power from the high heating power to the low heating power, an upper flame based on the upper end and the stepped portion, and a lower flame based on the lower end and the stepped portion. Divide and hold the flame. Accordingly, the flame holding property at the time of pressure fluctuation at which the input becomes smaller than the minimum heat power is improved, so that the minimum input can be set smaller and the turndown performance of the stove burner is improved.
[0010]
In addition, the upper part of the outer peripheral surface is inclined so that the upper part becomes more inward as it goes upward, so that the upper part has a triangular vertical cross section. Since the flame is held, it is easy to vertically divide the flame that has caved inward when the pressure fluctuates, and it is possible to surely prevent the divided upper and lower flames from holding each other at the step and blowing out.
Further, since the upper portion of the outer peripheral surface is inclined so as to be more inward as it goes upward, the upper portion surrounded by the eaves portion and the upper outer peripheral surface becomes an acute angle, and the holding power of the flame is further improved.
[0011]
In addition, in the stove burner according to the second aspect of the present invention, since an eave portion having a diameter larger than the maximum outer diameter of the outer peripheral surface is provided above the outer peripheral surface of the flame outlet, soup or the like into the flame outlet is provided. Not only can be reliably prevented, but also the upper foot can be formed larger, and the holding force at the time of flame division is further increased.
[0012]
Further, in the stove burner according to claim 3 of the present invention, by forming a hanging portion extending downward from the step portion on the hot transfer flame outlet, a lower portion of the hot transfer flame outlet portion is narrowed, and the lower lower portion is narrowed. Since a large deceleration effect is produced because fuel gas is blown out from a large space, a lift of a fire flame can be suppressed. For this reason, good fire transfer flames can always be formed, and stable fire transfer can be performed even when the heating power is reduced.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a stove burner of the present invention will be described below with reference to FIGS.
[0014]
As shown in FIG. 1, the stove burner 1 includes a burner main body 10 having a ring-shaped mixing section 11 for mixing fuel gas and primary air, and a burner head 20 mounted on the burner main body 10. Consists of
The mixing section 11 of the burner main body 10 communicates with a throat section 12 to which fuel gas is supplied from the gas nozzle 4. At the center of the burner head 20, a cylindrical portion 27 is formed. The cylindrical inner wall forming the mixing section 11 of the burner main body 10 serves as a positioning guide 13 of the burner head 20 which also serves as a secondary air passage at the time of combustion. Inserted. A mixing space 28 is provided in a ring shape on the outer periphery of the cylindrical portion 27 of the burner head 20. When the burner head 20 is mounted on the burner main body 10, the mixing portion 11 and the mixing space 28 are integrally formed into an annular shape. A mixed gas chamber 40 is formed.
[0015]
A large number of flame holes 21 are radially formed at a predetermined pitch on the cylindrical outer peripheral surface of the burner head 20, and when the burner head 20 is mounted on the burner main body 10, a large number of flame holes 2 are formed on the cylindrical outer peripheral surface. Are formed radially. Also, as shown in FIG. 2, in the middle of the arrangement of the flame groove 21 (for example, every four), there is no exhaust escape for discharging the combustion exhaust generated by the flame in the flame 2 to the outside. A flame outlet 22 is formed. Around the gas nozzle 4 provided at the base end of the throat section 12, a primary air intake port 14 for sucking the primary air for combustion with the ejection of the fuel gas is formed.
[0016]
The outer peripheral surfaces of the flame port portion 30 in which a large number of flame ports 2 are arranged and the non-flame vent port 22 for exhaust escape are formed by recessing the lower portion inward from the upper portion, thereby forming a space between the upper portion and the lower portion. A step 23 is provided. In addition, the upper part of the outer peripheral surface is inclined obliquely upward so that the upper part becomes more inward. Therefore, the outer peripheral surface is vertically divided into an upper outer peripheral surface 60a and a lower outer peripheral surface 60b.
An eave portion 26 is formed over the entire circumference above the outer peripheral surfaces of the flame port portion 30 and the non-flame port portion 22, that is, at the uppermost portion of the burner head 20. The diameter of the eave portion 26 is larger than the maximum outer diameter of the outer peripheral surface (the step portion 23).
Therefore, on the upper side of the outer peripheral surface, there is an upper portion 24a for flame holding having a triangular longitudinal section surrounded by the upper outer peripheral surface 60a and the eave portion 26, and on the lower side, the lower outer peripheral surface 60b and the step portion 23 are provided. A lower frame 24b for flame holding surrounded by is formed.
[0017]
As shown in FIG. 2, the non-flame port 22 is provided with a fire flame port 5. The hot transfer flame 5 is provided below the stepped portion 23, and a hanging portion 25 extending downward from the step 23 on the hot transfer flame 5 is formed.
[0018]
According to the above-mentioned stove burner 1, the outer peripheral surfaces of the flame port 30 and the non-flame port 22 are divided into upper and lower portions, and the flames 24a and 24b (upper flame 24a and lower flame 24b) capable of holding the flame are respectively provided. When the input becomes smaller than the minimum input of the set value at the time of adjusting the heating power from the high heat to the low heat, the flame may be split up and down for a moment, and the flame may be held at the upper foot 24a and the lower foot 24b. it can. That is, at the time of the minimum heating power, as shown in FIG. 1, the flame is held based on the upper end a and the lower end b of the outer peripheral surface, but the input becomes further smaller at the time of the pressure fluctuation in which the heating power is quickly adjusted from the strong heating power to the weak heating power. Also, as shown in FIG. 3, the flame can be divided into an upper flame based on the upper end a and the step c, and a lower flame based on the lower end b and the step c.
[0019]
The change of the flame at the time of adjusting the heating power will be described in detail with reference to FIGS.
At the time of high heat, as shown in FIG. 4, a large flame is held based on the upper end a and the lower end b of the outer peripheral surface. When the heat power is quickly adjusted to low heat power, the input momentarily becomes smaller than the minimum input value of the set value, and the flame indents. However, in this case, the small flame is divided into upper and lower parts as shown in FIG. Then, the upper flame is held at the upper foot 24a based on the upper end a and the step c, and the lower flame is held at the lower foot 24b based on the lower end b and the step c. When the heating power is low, a small flame is held based on the upper end a and the lower end b as shown in FIG.
Therefore, the flame holding property at the time of the pressure fluctuation at which the input becomes smaller than the minimum thermal power is improved, so that the minimum input can be set small, the turndown performance is improved, and the comb burner is easy to use.
[0020]
In addition, the upper part of the outer peripheral surface is inclined so as to be more inward toward the upper side, so that the upper foot 24a has a triangular depression in the longitudinal section, so that the upper foot 24a and the lower foot 24b share the common step portion 23. The base flame is used to hold the divided flame, so that the flame that has caved inward when the pressure fluctuates can be easily divided into upper and lower parts, and the divided upper and lower flames are mutually held by the step part 23 and blow out. Can be reliably prevented.
In addition, the upper portion 24a is formed to be larger by inclining the upper portion of the outer peripheral surface so as to be more inward toward the upper side, and the lower portion 24b is formed to be larger by making the lower portion of the outer peripheral surface inward than the upper portion. The holding power at the time of flame division becomes large.
Further, since the eave portion 26 having a diameter larger than the maximum outer diameter of the outer peripheral surface is provided above the outer peripheral surface of the flame outlet portion 30, not only can the drip of boiling juice or the like onto the flame outlet portion 30 be reliably prevented, but also The upper portion 24a can be formed larger, and the holding force at the time of flame division is further increased.
Furthermore, since the upper part of the outer peripheral surface is inclined so as to be more inward as it goes upward, the upper foot 24a surrounded by the eaves portion 26 and the upper outer peripheral surface 60a becomes an acute angle, and the holding power of the flame is improved.
In addition, the upper part of the outer peripheral surface is inclined so that the upper side is more inward, and the flame outlet surface is formed obliquely upward, and the flame outlet surface is inclined to the side orthogonal to the fuel gas ejection direction. The area can be reduced, and the flame holding performance is further improved.
[0021]
At the time of a high heat power or a medium heat power which is a constant heat power in which the heat power adjustment operation is not performed, the flow of the gas ejected from the flame outlet 2 is disturbed at the base end portion of the flame by the step portion 23 and becomes a vortex. Optimal flame holding properties are secured, and the lift of the flame formed in the flame port 2 is suppressed.
[0022]
Further, since the hanging portion 25 extending downward from the step portion 23 is formed on the flash flame 5, the lower portion 24 b of the flash flame portion becomes narrower, and the fuel gas flows from the narrow lower portion 24 b into a wide space. Since a large deceleration effect is generated due to jetting to the side, the lift of the fire flame can be suppressed. For this reason, good fire transfer flames can always be formed, and stable fire transfer can be performed even when the heating power is reduced. By the way, if the hanging portion 25 is formed over the entire step portion 23, the combustion space becomes too narrow and the combustion performance deteriorates due to lack of oxygen. However, in the stove burner 1 of the present embodiment, a part of the step portion 23 is formed. , The combustion state can be favorably maintained.
Further, in the stove burner 1, a thermocouple (not shown) for detecting a flame is provided to face the flame port 2, and as shown in FIG. Similarly to the upper step portion 23, a downwardly extending hanging portion 25 is formed to prevent the flame from lifting there, so that the thermocouple can always be stably heated. In FIG. 7, the position of the thermosensitive part of the thermocouple is indicated by a cross.
[0023]
Further, the eaves 26 having a diameter larger than the maximum outer diameter of the outer peripheral surface are provided over the entire outer periphery of the outer peripheral surfaces of the flame port portion 30 and the non-flame port portion 22, so that the broth or the like drops into the flame port 2. It is possible to prevent clogging of the flame. In the stove burner 1 of the present embodiment, the upper portion of the outer peripheral surface is inclined inward, so that the broth or the like can easily enter the flame opening 2, but this eave portion 26 reliably prevents dripping into the flame opening 2. it can.
[0024]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
[0025]
【The invention's effect】
As described in detail above, according to the stove burner according to claim 1 of the present invention, even when the input becomes smaller than the minimum thermal power setting input at the time of pressure fluctuation for quickly adjusting the thermal power from strong thermal power to low thermal power, The flame can be divided into an upper flame based on the upper end of the outer peripheral surface and the step, and a lower flame based on the lower end and the step. Therefore, the flame holding property at the time of the pressure fluctuation at which the input becomes smaller than the minimum thermal power is improved, so that the minimum input can be set small, the turndown performance is improved, and the comb burner is easy to use.
[0026]
Furthermore, according to the stove burner according to claim 2 of the present invention, since the eave portion having a diameter larger than the maximum outer diameter of the outer peripheral surface is provided above the outer peripheral surface of the flame outlet portion, Not only can the drop of boiling broth or the like be reliably prevented, but also the upper lid can be formed larger, and the holding power during flame division can be further increased.
[0027]
Further, according to the stove burner according to the third aspect of the present invention, by forming a sagging portion extending downward from the step portion on the flash flame outlet, a lower portion of the flash flame outlet portion is narrowed to greatly reduce the speed. The effect can be produced, and the lift of the fire flame can be suppressed. For this reason, good fire transfer flames can be always formed, and stable fire transfer can be performed even when the heating power is reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a stove burner according to the present embodiment. (At low heat)
FIG. 2 is an enlarged front view of a flame port and a non-flame port.
FIG. 3 is a cross-sectional view of the stove burner according to the present embodiment. (When pressure fluctuates)
FIG. 4 is an enlarged view of the vicinity of a flame opening of the stove burner according to the present embodiment. (At high heat)
FIG. 5 is an enlarged view of the vicinity of a flame outlet of the stove burner according to the present embodiment. (When pressure fluctuates)
FIG. 6 is an enlarged view of the vicinity of a flame outlet of the stove burner according to the present embodiment. (At low heat)
FIG. 7 is an explanatory diagram of a thermocouple mounting position.
FIG. 8 is a cross-sectional view of a conventional burner burner. (At low heat)
FIG. 9 is a cross-sectional view of a conventional burner burner. (When pressure fluctuates)
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Burner burner, 2 ... Flame mouth, 5 ... Fire flame, 10 ... Burner main body, 20 ... Burner head, 22 ... Non-flame mouth part, 23 ... Step part, 24a ... Upper part, 24b ... Lower part, 25: hanging portion, 26: eave portion, 30: flame outlet portion, 60a: upper outer peripheral surface, 60b: lower outer peripheral surface.

Claims

In the stove burner formed with a number of flame ports on the cylindrical outer peripheral surface of the burner head, and an eave portion for preventing dripping of boiling water and the like to the flame port portion over the entire periphery of the burner head,
By forming the lower part of the outer peripheral surface of the flame opening part inwardly from the upper part to form a step between the upper part and the lower part, the upper part of the outer peripheral surface is inclined such that the upper part becomes more inward toward the upper part. Thus, the upper part of the outer peripheral surface is surrounded by an upper flame holding portion surrounded by the upper outer peripheral surface and the eave portion, and the lower part of the outer peripheral surface is surrounded by the lower outer peripheral surface and the step portion. A combo burner characterized by forming a lower frame for flame holding.

The stove burner according to claim 1, wherein a diameter of the eave portion is larger than a maximum outer diameter of an outer peripheral surface of the flame port portion.

A non-flame outlet for exhaust relief is provided in the middle of the flame port arrangement of the flame outlet, and a flash-fire flame is provided only below the stepped portion of the non-flame vent for exhaust relief. 3. The stove burner according to claim 1, wherein a hanging portion extending downward from the step on the mouth is formed.