JP2018004127A - Gas burner device - Google Patents

Gas burner device Download PDF

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JP2018004127A
JP2018004127A JP2016129097A JP2016129097A JP2018004127A JP 2018004127 A JP2018004127 A JP 2018004127A JP 2016129097 A JP2016129097 A JP 2016129097A JP 2016129097 A JP2016129097 A JP 2016129097A JP 2018004127 A JP2018004127 A JP 2018004127A
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gas
air
blower fan
burner
gas burner
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JP6727710B2 (en
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真吾 柘植
Shingo Tsuge
真吾 柘植
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Rinnai Corp
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Rinnai Corp
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Priority to JP2016129097A priority Critical patent/JP6727710B2/en
Priority to KR1020170078387A priority patent/KR102312889B1/en
Priority to CN201710493676.2A priority patent/CN107543159B/en
Priority to US15/632,720 priority patent/US20180003379A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

【課題】従来のものでは、送風ファンによってガスバーナの１次側に設けられたバーナ室に供給される空気量とガス量とを別個に減少させるので、減少させる前と後とでは空気とガスとの混合比が変化するおそれが生じる。そのため、空気量とガス量とを絞る前の状態ではガスバーナにおいて正常に燃焼していても、両者を絞った後では混合比が変化して、例えば空気が過剰になれば失火し、ガスが過剰になれば燃焼不良状態が発生するおそれが生じる。【解決手段】ガスの供給管の出口におけるガスの圧力を大気圧に調圧して空気とガスとが同じ負圧によって送風ファンに吸引されるように構成し、送風ファンとバーナ室との間に、上記混合気の流路面積を増減させ負圧を調節する能力切り替え機構を設けた。【選択図】 図３Conventionally, since the amount of air and the amount of gas supplied to a burner chamber provided on the primary side of a gas burner by a blower fan are separately reduced, air and gas before and after the reduction are reduced. The mixing ratio may change. Therefore, even if the gas burner burns normally in the state before reducing the amount of air and the amount of gas, the mixture ratio changes after squeezing both. If it becomes, there exists a possibility that a combustion failure state may generate | occur | produce. The gas pressure at the outlet of the gas supply pipe is adjusted to atmospheric pressure so that air and gas are sucked into the blower fan by the same negative pressure, and between the blower fan and the burner chamber. An ability switching mechanism for adjusting the negative pressure by increasing or decreasing the flow area of the air-fuel mixture is provided. [Selection] Figure 3

Description

本発明は、燃焼用の空気を送風する送風ファンに空気と共にガスを吸引させ、空気とガストの混合気をガスバーナに供給するガスバーナ装置に関する。   The present invention relates to a gas burner apparatus that causes a blower fan that blows combustion air to suck gas together with air and supplies a gas / burner mixture to the gas burner.

予混合式と呼ばれるガスバーナでは、ガスバーナの上流に燃焼用の空気をガスバーナに送風する送風ファンを備えており、更に、この送風ファンがガスバーナに供給する空気中にガスを所定の比率で混合させ、空気とガスとの混合気をガスバーナに供給するように構成されている。   In the gas burner called a premixing type, it is provided with a blower fan that blows combustion air to the gas burner upstream of the gas burner, and further, gas is mixed at a predetermined ratio into the air that is supplied to the gas burner by the blower fan, An air / gas mixture is supplied to the gas burner.

このようなガスバーナと送風ファンとを備えたガスバーナ装置として、例えば、送風ファンの上流側の空気の吸い込み部にバタフライ弁を設けて、吸気抵抗を切り替えるように構成すると共に、バタフライ弁の下流にガスを噴出させるガス通路を開口させ、そのガス通路の抵抗を切り替える弁を設け、バタフライ弁により吸気抵抗が大きくなった状態でガス通路の抵抗が大きくなるように、バタフライ弁とガス通路の弁とを機械的にリンクさせたものが知られている（例えば、特許文献１参照）。   As a gas burner device including such a gas burner and a blower fan, for example, a butterfly valve is provided in an air suction portion on the upstream side of the blower fan to switch the intake resistance, and a gas is provided downstream of the butterfly valve. A valve is provided to switch the gas passage resistance, and the butterfly valve and the gas passage valve are connected so that the resistance of the gas passage increases when the intake resistance is increased by the butterfly valve. A mechanically linked one is known (for example, see Patent Document 1).

この従来のものでは、通常はバタフライ弁は全開であるが、送風ファンの回転数の下限値に相当する発熱量（インプット）よりも少ない発熱量でガスバーナを燃焼させたい場合に、バタフライ弁で空気流を絞ると共に、ガスの噴出量を少なくして、送風ファンの回転数を下限値よりも高い回転数で運転させながらガスバーナでの燃焼量を小さくすることができる。   In this conventional type, the butterfly valve is normally fully open. However, when it is desired to burn the gas burner with a calorific value smaller than the calorific value (input) corresponding to the lower limit value of the rotational speed of the blower fan, It is possible to reduce the amount of combustion in the gas burner while narrowing the flow and reducing the amount of gas jetting and operating the rotational speed of the blower fan at a rotational speed higher than the lower limit value.

特開２０１４−２１５００７号公報（図１）JP 2014-215007 A (FIG. 1)

上記従来のものでは、ガスバーナに供給される空気量とガス量とを別個に減少させるので、減少させる前と後とでは空気とガスとの混合比が変化するおそれが生じる。そのため、空気量とガス量とを絞る前の状態ではガスバーナにおいて正常に燃焼していても、両者を絞った後では混合比が変化して、例えば空気が過剰になれば失火し、ガスが過剰になれば燃焼不良状態が発生するおそれが生じる。   In the above-mentioned conventional one, since the amount of air and the amount of gas supplied to the gas burner are separately reduced, there is a possibility that the mixing ratio of air and gas changes before and after the reduction. Therefore, even if the gas burner is combusting normally in the state before the air amount and the gas amount are reduced, the mixture ratio changes after the both are reduced, for example, if the air becomes excessive, it will misfire and the gas will be excessive. If it becomes, there exists a possibility that a poor combustion state may occur.

また、上記従来ものではガス通路の抵抗を２段階にしか切り替えることができないので、ガスバーナにおける燃焼量を細かく調節することができない。   Further, in the above-mentioned conventional one, the resistance of the gas passage can be switched only in two stages, so that the amount of combustion in the gas burner cannot be finely adjusted.

そこで本発明は、上記の問題点に鑑み、ガスバーナに供給させる混合気量を絞っても混合比が変化することのないガスバーナ装置を提供することを課題とする。   In view of the above problems, an object of the present invention is to provide a gas burner device in which the mixture ratio does not change even when the amount of air-fuel mixture supplied to the gas burner is reduced.

上記課題を解決するために本発明によるガスバーナ装置は、炎孔を有するバーナの上流側に設けられたバーナ室に、空気とガスとの混合気を供給する予混合式ガスバーナであって、上記バーナ室に連結された送風ファンを備え、この送風ファンの吸気口側にガスの供給管の出口を臨ませ、この吸気口を通って送風ファンに吸引される空気流にガスの供給管の出口からガスを吸引させ、空気とガスを送風ファン内で混合して上記混合気とするものにおいて、上記ガスの供給管の出口におけるガスの圧力が大気圧に調圧されており、上記送風ファンと上記バーナ室との間に、上記混合気の流路面積を増減させる能力切り替え機構を設けたことを特徴とする。   In order to solve the above problems, a gas burner apparatus according to the present invention is a premixed gas burner for supplying a mixture of air and gas to a burner chamber provided upstream of a burner having a flame hole, A blower fan connected to the chamber, with the outlet of the gas supply pipe facing the intake port side of the blower fan, and from the outlet of the gas supply pipe to the air flow sucked into the blower fan through the intake port The gas is sucked and the air and the gas are mixed in the blower fan to obtain the mixture, and the pressure of the gas at the outlet of the gas supply pipe is adjusted to the atmospheric pressure. A capability switching mechanism for increasing or decreasing the flow area of the air-fuel mixture is provided between the burner chamber.

送風ファンを回転させると吸気口内に負圧が生じる。吸気口の周辺の空気はその負圧によって送風ファン内に吸引されるが、ガスの供給管の出口におけるガスの圧力が大気圧に調圧されているので、吸気口内の負圧によってガスも空気と同様に送風ファン内に吸引される。すなわち、吸気とガスとは同じ個所に生じる負圧によって吸引されるので、送風ファンの回転数が変化して吸気口の負圧が変化した場合、空気とガスとの吸引量は変化するが、空気とガスとの比率は変化しない。なお、混合気の流路面積を増減させて吸気口の負圧を変化させた場合も同様に空気とガスとの比率は変化しない。   When the blower fan is rotated, negative pressure is generated in the intake port. The air around the intake port is sucked into the blower fan by the negative pressure, but the gas pressure at the outlet of the gas supply pipe is regulated to atmospheric pressure, so the gas is also air-induced by the negative pressure in the intake port. Is sucked into the blower fan. That is, since the intake air and the gas are sucked by the negative pressure generated at the same location, when the rotation speed of the blower fan changes and the negative pressure of the intake port changes, the suction amount of the air and the gas changes, The ratio of air to gas does not change. Note that the ratio of air to gas does not change when the negative pressure at the intake port is changed by increasing or decreasing the flow area of the air-fuel mixture.

なお、上記能力切り替え機構は、上記混合気の流路面積が最大となる状態で矩形状をしており、この矩形状の流路を一方から狭めていくシャッタ部材を備えるように構成することが望ましい。   The capacity switching mechanism has a rectangular shape in a state where the flow path area of the air-fuel mixture is maximized, and may be configured to include a shutter member that narrows the rectangular flow path from one side. desirable.

例えば、混合気の流路の断面が円形をしている場合、その円形の直径を変化させることによって流路面積を増減させるように構成すると、流路面積の誤差は直径の寸法誤差の２乗となって現れるので、流路面積がばらつき量が大きくなるが、上記構成によれば、流路面積の誤差は小さくなる。   For example, when the cross section of the air-fuel mixture flow path is circular, if the flow path area is increased or decreased by changing the diameter of the circular shape, the error of the flow path area is the square of the dimensional error of the diameter. Therefore, although the flow path area has a large amount of variation, the above configuration reduces the error of the flow path area.

ところで、ガスバーナに対する混合気の供給量を少なくすると、ガスバーナの各炎孔からの混合気の噴出速度が限界値よりも遅くなり、ガスバーナで失火が生じるおそれがある。そこで、このような場合には、上記混合気の流路面積が最大時における混合気流の中心線上に位置してバーナ室内を２分する仕切り板を設け、流路面積が最少時における混合気流の大半が仕切り板で仕切られた一方の空間内に流入して、その一方の空間に連通する炎孔での燃焼を確保するように構成することが望ましい。   By the way, if the supply amount of the air-fuel mixture to the gas burner is reduced, the jet speed of the air-fuel mixture from each flame hole of the gas burner becomes slower than the limit value, and there is a possibility that misfire occurs in the gas burner. Therefore, in such a case, a partition plate that divides the burner chamber into two parts is provided on the center line of the mixed airflow when the flow area of the air-fuel mixture is maximum, and the mixed airflow when the flow area is minimum is provided. It is desirable to configure so that most of the gas flows into one space partitioned by the partition plate and combustion is ensured in the flame holes communicating with the one space.

以上の説明から明らかなように、本発明は、ガスバーナへの混合気の供給量を増減させても、空気とガスとの混合比が変化しないので、ガスバーナで安定した燃焼を実現することができる。   As is clear from the above description, the present invention can realize stable combustion with the gas burner because the mixture ratio of air and gas does not change even when the amount of the air-fuel mixture supplied to the gas burner is increased or decreased. .

本発明の一実施の形態の構成を示す図The figure which shows the structure of one embodiment of this invention 送風ファンの側面図Side view of the blower fan 送風ファンの内部構造を示す図Diagram showing the internal structure of the blower fan 送風ファンの回転数とガスバーナのインプットとの関係を示す図The figure which shows the relationship between the rotation speed of the blower fan and the input of the gas burner

図１および図２を参照して、１は給湯装置に組み込まれるガスバーナであり、図示しない炎孔が下方に向かって設けられている。従って、このガスバーナ１には上方からガスと空気との混合気が供給され、ガスバーナ１の下面に炎が形成される。   1 and 2, reference numeral 1 denotes a gas burner incorporated in a hot water supply apparatus, and a flame hole (not shown) is provided downward. Therefore, a gas / air mixture is supplied to the gas burner 1 from above, and a flame is formed on the lower surface of the gas burner 1.

ガスバーナ１の下部には熱交換器１１が接続されており、循環する水をこの熱交換器１１で加熱して給湯するように構成されている。１２はガスバーナ１の上部に取り付けられた１次室であり、この１次室に対してダクト２３を介して送風ファン２からガスと空気との混合気が供給される。   A heat exchanger 11 is connected to the lower part of the gas burner 1, and the circulating water is heated by the heat exchanger 11 to supply hot water. Reference numeral 12 denotes a primary chamber attached to the upper portion of the gas burner 1, and an air-fuel mixture of gas and air is supplied from the blower fan 2 through the duct 23 to the primary chamber.

送風ファン２はいわゆるタービン式のものであり、内部のタービンがモータ２１によって回転すると、吸気口２２内に負圧が生じるため、吸気口２２内を通って外部の空気が送風ファン２へと吸引される。また、この吸気口２２にはガスの供給管３が接続されている。この供給管３にはゼロガバナと言われる調圧装置３１が接続されており、一定の陽圧で供給されるガスの圧力を大気圧まで減圧して供給管３から吸気口２２に供給するように構成されている。従って、送風ファン２が停止しており、吸気口２２内に負圧が生じていない状態では、供給管３から吸気口２２へとガスは流れないが、送風ファン２が作動して吸気口２２に負圧が生じると、その負圧の大きさに比例する流量のガスが供給管３から吸気口２２内へと吸引される。   The blower fan 2 is a so-called turbine type, and when the internal turbine is rotated by the motor 21, negative pressure is generated in the intake port 22, so that external air is sucked into the blower fan 2 through the intake port 22. Is done. A gas supply pipe 3 is connected to the intake port 22. A pressure regulator 31 called a zero governor is connected to the supply pipe 3 so that the pressure of the gas supplied at a constant positive pressure is reduced to atmospheric pressure and supplied from the supply pipe 3 to the intake port 22. It is configured. Therefore, when the blower fan 2 is stopped and no negative pressure is generated in the intake port 22, no gas flows from the supply pipe 3 to the intake port 22, but the blower fan 2 operates and the intake port 22. When a negative pressure is generated, a gas having a flow rate proportional to the magnitude of the negative pressure is sucked into the intake port 22 from the supply pipe 3.

そして、吸気口２２内に吸引されたガスは吸気口２２を通って吸引された空気と送風ファン２内で混合され、ダクト２３からガスバーナ１へと供給される。なお、送風ファン２の回転数はモータ２１の回転数に対応するが、送風ファン２の回転数の高低によって吸気口２２の負圧の大きさが増減する。但し、吸気口２２の負圧の大きさが増減して、吸引される空気量が増減しても、供給管３からのガスの吸引量も増減するので、ガスバーナ１に供給される混合気の混合比率は常に一定になる。   The gas sucked into the air inlet 22 is mixed with the air sucked through the air inlet 22 in the blower fan 2 and supplied from the duct 23 to the gas burner 1. The rotational speed of the blower fan 2 corresponds to the rotational speed of the motor 21, but the magnitude of the negative pressure at the intake port 22 increases or decreases depending on the rotational speed of the blower fan 2. However, even if the magnitude of the negative pressure at the intake port 22 increases and decreases and the amount of air sucked increases and decreases, the amount of gas sucked from the supply pipe 3 also increases and decreases. The mixing ratio is always constant.

図３を参照して、２４はタービンであり、このタービン２４から送り出される混合気はダクト２３を通って１次室１２内に流れる。このダクト２３と１次室１２との間に矩形状の開口２５を設けた。そして、この開口２５を一方から途中まで閉塞するシャッタ４を能力切り替え機構として設けた。   Referring to FIG. 3, reference numeral 24 denotes a turbine, and the air-fuel mixture fed from the turbine 24 flows into the primary chamber 12 through the duct 23. A rectangular opening 25 is provided between the duct 23 and the primary chamber 12. The shutter 4 that closes the opening 25 from one side to the middle is provided as a capability switching mechanism.

シャッタ４が全開であれば、ダクト２３からの混合気は矢印Ａ，Ｂで示す流れとなって、１次室１２内の全域に流れ込む。一方、シャッタ４を揺動させ、開口２５を半分閉塞ずると、混合気は矢印Ｂで示す流れとなり、１次室１２内を分割する仕切り板１３によって分割された片側の空間内に流れ込むことになる。   If the shutter 4 is fully open, the air-fuel mixture from the duct 23 flows as indicated by arrows A and B and flows into the entire area of the primary chamber 12. On the other hand, when the shutter 4 is swung and the opening 25 is half-closed, the air-fuel mixture flows as shown by an arrow B and flows into the space on one side divided by the partition plate 13 dividing the inside of the primary chamber 12. Become.

シャッタ４が全開であれば、ガスバーナ１の全面に相当するエリアａに炎が形成されるが、シャッタ４で開口２５の半分を閉塞すると、炎は主にエリアｂに集中して形成されることになる。   If the shutter 4 is fully open, a flame is formed in the area a corresponding to the entire surface of the gas burner 1. However, if half of the opening 25 is closed by the shutter 4, the flame is mainly formed in the area b. become.

なお、シャッタ４が全開であればダクト２３から１次室１２内への抵抗は小さいが、シャッタ４によって開口２５の半分を閉塞すると、ダクト２３から１次室１２への抵抗が大きくなり、送風ファン２の回転数が同じであっても、開口２５が全開状態における混合気の流量より、開口２５が半分閉塞されている状態での混合気の流量は減少することになる。   If the shutter 4 is fully opened, the resistance from the duct 23 into the primary chamber 12 is small. However, if the shutter 4 closes half of the opening 25, the resistance from the duct 23 to the primary chamber 12 increases, and the air flow Even if the rotation speed of the fan 2 is the same, the flow rate of the air-fuel mixture when the opening 25 is half-closed is reduced from the flow rate of the air-fuel mixture when the opening 25 is fully open.

図４を参照して、開口２５が全開状態での送風ファン２の回転数とガスバーナ１へのインプットとの関係はＬ１に示すものになる。ここで、ガスバーナ１へのインプットとは混合気の供給量に比例する。   Referring to FIG. 4, the relationship between the rotational speed of blower fan 2 and the input to gas burner 1 when opening 25 is fully open is indicated by L1. Here, the input to the gas burner 1 is proportional to the supply amount of the air-fuel mixture.

ガスバーナ１での燃焼量を低下させる、すなわちインプットを低下させる場合には、送風ファン２の回転数を低下させればよい。但し、送風ファン２の回転数には下限値ＲＬが設定されており、この下限値ＲＬよりも低速で回転させることができない。そのため、開口２５が全開であれば、インプットの下限値はＣＬ１となり、これ以下にインプットを小さくすることができない。   When the amount of combustion in the gas burner 1 is reduced, that is, when the input is reduced, the rotational speed of the blower fan 2 may be reduced. However, the rotation speed of the blower fan 2 is set to a lower limit value RL, and cannot be rotated at a lower speed than the lower limit value RL. Therefore, if the opening 25 is fully open, the lower limit value of the input is CL1, and the input cannot be reduced below this value.

そこで、更にインプットを下げたい場合には、開口２５をシャッタ４によって半分閉塞する。すると、送風ファン２とインプットとの相関関係がＬ２に示すものになる。そのため、送風ファン２の回転数を下限値ＲＬまで下げると、インプットをＣＬ２まで減少させることができる。   Therefore, when further lowering the input, the opening 25 is half closed by the shutter 4. Then, the correlation between the blower fan 2 and the input is indicated by L2. Therefore, when the rotation speed of the blower fan 2 is lowered to the lower limit value RL, the input can be reduced to CL2.

なお、本発明は上記した形態に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内において種々の変更を加えてもかまわない。   In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

１ ガスバーナ
２ 送風ファン
３ 供給管
４ シャッタ
１１ 熱交換器
１３ 仕切り板
２１ モータ
２２ 吸気口
２３ ダクト
２４ タービン
２５ 開口
３１ 調圧装置 DESCRIPTION OF SYMBOLS 1 Gas burner 2 Blower fan 3 Supply pipe 4 Shutter 11 Heat exchanger 13 Partition plate 21 Motor 22 Inlet 23 Duct 24 Turbine 25 Opening 31 Pressure regulator

Claims (3)

炎孔を有するバーナの上流側に設けられたバーナ室に、空気とガスとの混合気を供給する予混合式ガスバーナであって、上記バーナ室に連結された送風ファンを備え、この送風ファンの吸気口側にガスの供給管の出口を臨ませ、この吸気口を通って送風ファンに吸引される空気流にガスの供給管の出口からガスを吸引させ、空気とガスを送風ファン内で混合して上記混合気とするものにおいて、上記ガスの供給管の出口におけるガスの圧力が大気圧に調圧されており、上記送風ファンと上記バーナ室との間に、上記混合気の流路面積を増減させる能力切り替え機構を設けたことを特徴とする予混合式ガスバーナ。   A premixed gas burner for supplying a mixture of air and gas to a burner chamber provided upstream of a burner having a flame hole, comprising a blower fan connected to the burner chamber, The outlet of the gas supply pipe faces the intake port side, and the air is sucked from the outlet of the gas supply pipe into the air flow sucked into the blower fan through this intake port, and the air and gas are mixed in the blower fan. Then, in the mixture, the gas pressure at the outlet of the gas supply pipe is adjusted to atmospheric pressure, and the channel area of the mixture is between the blower fan and the burner chamber. A premixed gas burner characterized in that it is provided with a capacity switching mechanism for increasing or decreasing the pressure. 上記能力切り替え機構は、上記混合気の流路面積が最大となる状態で矩形状をしており、この矩形状の流路を一方から狭めていくシャッタ部材を備えていることを特徴とする請求項１に記載の予混合式ガスバーナ。   The capability switching mechanism has a rectangular shape in a state where the flow path area of the air-fuel mixture is maximized, and includes a shutter member that narrows the rectangular flow path from one side. Item 2. The premixed gas burner according to Item 1. 上記混合気の流路面積が最大時における混合気流の中心線上に位置してバーナ室内を２分する仕切り板を設け、流路面積が最少時における混合気流の大半が仕切り板で仕切られた一方の空間内に流入して、その一方の空間に連通する炎孔での燃焼を確保するようにしたことを特徴とする請求項１または請求項２に記載の予混合式ガスバーナ。   A partition plate is provided on the center line of the mixed airflow when the flow area of the air-fuel mixture is maximum and bisects the burner chamber, and most of the mixed airflow when the flow area is minimum is partitioned by the partition plate The premixed gas burner according to claim 1 or 2, wherein the combustion is ensured in a flame hole that flows into the first space and communicates with one of the spaces.
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