JP2017067409A - Composite heat source machine - Google Patents

Composite heat source machine Download PDF

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JP2017067409A
JP2017067409A JP2015195645A JP2015195645A JP2017067409A JP 2017067409 A JP2017067409 A JP 2017067409A JP 2015195645 A JP2015195645 A JP 2015195645A JP 2015195645 A JP2015195645 A JP 2015195645A JP 2017067409 A JP2017067409 A JP 2017067409A
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burner
air
burners
fan
supply path
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JP6633334B2 (en
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岡本　英男
Hideo Okamoto
英男 岡本
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Rinnai Corp
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Rinnai Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/008—Flow control devices
    • 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
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F23K5/005—Gaseous fuel from a central source to a plurality of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L3/00—Arrangements of valves or dampers before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/04—Regulating fuel supply conjointly with air supply and with draught
    • F23N1/045—Regulating fuel supply conjointly with air supply and with draught using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/345—Control of fans, e.g. on-off control
    • F24H15/35—Control of the speed of fans
    • 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
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2400/00—Pretreatment and supply of gaseous fuel
    • F23K2400/20—Supply line arrangements
    • F23K2400/201—Control devices
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/10—Air or combustion gas valves or dampers power assisted, e.g. using electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/02—Space-heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/04—Heating water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water

Abstract

PROBLEM TO BE SOLVED: To individually adjust the quantity of mixed air to be supplied to first and second burners by interposing a single fan 6 in a common air supply path 5 connected to both the burners, connecting a downstream end of a gas supply path 7 where flow rate adjustment means 73 is interposed, to a portion of the air supply path at an upstream side or a downstream side of the fan and supplying the mixed air of primary air and a fuel gas to both the burners via the air supply path in a composite heat source machine comprising first and second two heat exchangers 1and 1and first and second two burners 2and 2.SOLUTION: An on-off valve 8 is provided in a connection part 2a of the first burner 2and the air supply path 5, and a flow rate adjustment valve 9 is provided in a connection part 2a of the second burner 2and the air supply path 5. The quantity of mixed air to be supplied to the first burner 2is adjusted by a rotation speed of the fan 6, and the quantity of mixed air to be supplied to the second burner 2is adjusted by the rotation speed of the fan 6 and the flow rate adjustment valve 9.SELECTED DRAWING: Figure 1

Description

本発明は、第１と第２の２つの熱交換器と、第１熱交換器を加熱する第１バーナと、第２熱交換器を加熱する第２バーナとを備える複合熱源機に関する。   The present invention relates to a composite heat source apparatus including first and second heat exchangers, a first burner for heating the first heat exchanger, and a second burner for heating the second heat exchanger.

従来、この種の複合熱源機として、第１と第２の両バーナを濃淡バーナ等のブンゼン式バーナで構成し、両バーナに共通のファンにより燃焼用空気（一次空気及び二次空気）を供給す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）。   Conventionally, as this type of combined heat source machine, both the first and second burners are composed of a Bunsen burner such as a light and dark burner, and combustion air (primary air and secondary air) is supplied to both burners by a common fan. What was made to do is known (for example, refer patent document 1).

このものでは、両バーナに対するファンの共用化でコストダウンを図ることができるが、以下の不具合がある。即ち、第１バーナと第２バーナとの一方のバーナのみを燃焼させて、当該バーナに対応する一方の熱交換器を加熱する単独運転時、他方のバーナにも空気が供給され、この空気がそのまま他方のバーナに対応する他方の熱交換器を通過して、この熱交換器が冷却され、この熱交換器の再加熱時の熱効率が悪くなってしまう。   This can reduce costs by sharing fans for both burners, but has the following problems. That is, in the single operation in which only one of the first burner and the second burner is burned and one heat exchanger corresponding to the burner is heated, air is also supplied to the other burner. As it passes through the other heat exchanger corresponding to the other burner, the heat exchanger is cooled, and the heat efficiency at the time of reheating the heat exchanger is deteriorated.

ところで、複合熱源機ではないが、従来、単一の熱交換器を加熱する複数のバーナを備える熱源機において、複数のバーナを全一次燃焼式バーナで構成し、これらバーナに接続される共通の給気路に、一次空気を供給する単一のファンを介設し、燃料ガスを供給するガス供給路の下流端をファンの上流側又は下流側の給気路の部分に接続して、一次空気と燃料ガスとの混合気が給気路を介して複数のバーナに供給されるようにし、ガス供給路に、混合気の空燃比が一定になるように一次空気の供給量に比例して燃料ガスの供給量を可変する流量調節手段を介設すると共に、各バーナと給気路との接続部に各開閉弁を設けたものが知られている（例えば、特許文献２参照）。   By the way, although it is not a composite heat source machine, conventionally, in a heat source machine provided with a plurality of burners for heating a single heat exchanger, a plurality of burners are composed of all primary combustion burners and are connected to these burners. A single fan for supplying primary air is installed in the air supply path, and the downstream end of the gas supply path for supplying fuel gas is connected to a part of the air supply path upstream or downstream of the fan. A mixture of air and fuel gas is supplied to a plurality of burners via an air supply path, and the gas supply path is proportional to the amount of primary air supplied so that the air-fuel ratio of the mixture is constant. A system is known in which a flow rate adjusting means for changing the supply amount of fuel gas is provided, and each open / close valve is provided at a connection portion between each burner and an air supply path (see, for example, Patent Document 2).

この技術を複合熱源機に適用し、第１と第２の各熱交換器を加熱する第１と第２の各バーナを全一次燃焼式バーナで構成し、単一のファンを介設した給気路を介して混合気を第１と第２の両バーナに供給すると共に、各バーナと給気路との接続部に各開閉弁を設けて、第１バーナと第２バーナとの一方のバーナのみを燃焼させて、当該バーナに対応する一方の熱交換器を加熱する単独運転時は、他方のバーナと給気路との接続部に設けた開閉弁を閉じて、他方のバーナへの混合気の供給を停止することが考えられる。これによれば、単独運転時に燃焼させない他方のバーナに対応する他方の熱交換器がファンからの空気流で冷却されることを防止できる。   Applying this technology to a composite heat source machine, the first and second burners for heating the first and second heat exchangers are composed of all primary combustion burners, and a single fan is interposed. The air-fuel mixture is supplied to both the first and second burners via the air passage, and each open / close valve is provided at the connection portion between each burner and the air supply passage, so that one of the first burner and the second burner is provided. At the time of single operation in which only the burner is burned and one heat exchanger corresponding to the burner is heated, the on-off valve provided at the connection portion between the other burner and the air supply path is closed, and the other burner is connected. It is conceivable to stop the supply of the air-fuel mixture. According to this, it can prevent that the other heat exchanger corresponding to the other burner which is not burned at the time of an independent operation is cooled with the airflow from a fan.

然し、これでは、以下の不具合を生ずる。即ち、第１と第２の両バーナを燃焼させて第１と第２の両熱交換器を加熱する同時運転時、ファン回転数を変化させると、第１バーナへの混合気の供給量と第２バーナへの混合気の供給量とが共に変化してしまい、第１バーナへの混合気の供給量と第２バーナへの混合気の供給量とを個別に調節できなくなる。   However, this causes the following problems. That is, when the fan speed is changed during simultaneous operation in which both the first and second burners are burned to heat both the first and second heat exchangers, the amount of air-fuel mixture supplied to the first burner is Both the supply amount of the air-fuel mixture to the second burner change, and the supply amount of the air-fuel mixture to the first burner and the supply amount of the air-fuel mixture to the second burner cannot be individually adjusted.

特開２００６−３８４２３号公報JP 2006-38423 A 特開２０１０−１５１３９５号公報JP 2010-151395 A

本発明は、以上の点に鑑み、共通の給気路を介して混合気を供給する第１と第２の各バーナへの混合気の供給量を個別に調節できるようにした複合熱源機を提供することをその課題としている。   In view of the above, the present invention provides a composite heat source apparatus that can individually adjust the amount of air-fuel mixture supplied to each of the first and second burners that supply air-fuel mixture via a common air supply path. The issue is to provide.

上記課題を解決するために、本発明は、第１と第２の２つの熱交換器と、第１熱交換器を加熱する第１バーナと、第２熱交換器を加熱する第２バーナとを備える複合熱源機であって、第１と第２の両バーナは全一次燃焼式バーナで構成され、これら両バーナに接続される共通の給気路に、一次空気を供給する単一のファンが介設され、燃料ガスを供給するガス供給路の下流端がファンの上流側又は下流側の給気路の部分に接続されて、一次空気と燃料ガスとの混合気が給気路を介して第１と第２の両バーナに供給されるようにし、ガス供給路に、混合気の空燃比が一定になるように一次空気の供給量に比例して燃料ガスの供給量を可変する流量調節手段を介設するものにおいて、第１と第２の両バーナのうちの一方のバーナと給気路との接続部に開閉弁が設けられると共に、他方のバーナと給気路との接続部に流量調節弁が設けられ、一方のバーナへの混合気の供給量は、ファンの回転数により調節され、他方のバーナへの混合気の供給量は、ファンの回転数と流量調節弁とにより調節されることを特徴とする。   In order to solve the above-described problems, the present invention includes first and second heat exchangers, a first burner that heats the first heat exchanger, and a second burner that heats the second heat exchanger. The first and second burners are composed of all primary combustion burners, and a single fan that supplies primary air to a common air supply path connected to both the burners. The downstream end of the gas supply path for supplying the fuel gas is connected to a part of the air supply path on the upstream side or the downstream side of the fan, and the mixture of primary air and fuel gas passes through the air supply path. The flow rate is such that the fuel gas supply amount is varied in proportion to the primary air supply amount so that the air-fuel ratio of the air-fuel mixture becomes constant in the gas supply path. Connection between one of the first and second burners and the air supply path in the case where the adjusting means is interposed Is provided with a flow control valve at the connection between the other burner and the air supply passage, and the amount of air-fuel mixture supplied to one burner is adjusted by the rotational speed of the fan, and the other burner The supply amount of the air-fuel mixture is adjusted by the rotational speed of the fan and the flow rate control valve.

本発明によれば、第１と第２の両バーナを燃焼させて第１と第２の両熱交換器を加熱する同時運転時、第１と第２の両バーナのうちの一方のバーナへの混合気の供給量をファン回転数の制御で一方のバーナの要求燃焼量に応じた量に調節すると共に、他方のバーナへの混合気の供給量を流量調節弁の制御で他方のバーナの要求燃焼量に応じた量に調節することができる。即ち、第１バーナへの混合気の供給量と第２バーナへの混合気の供給量とを個別に調節できる。更に、一方のバーナと給気路との接続部には開閉弁を設けるため、この接続部にも流量調節弁を設けるものに比し、コストダウンを図ることができる。   According to the present invention, during simultaneous operation in which both the first and second burners are burned to heat both the first and second heat exchangers, one of the first and second burners is transferred to one of the first and second burners. The air-fuel mixture supply amount is adjusted to an amount corresponding to the required combustion amount of one burner by controlling the fan speed, and the air-fuel mixture supply amount to the other burner is controlled by controlling the flow rate control valve. The amount can be adjusted according to the required combustion amount. That is, the supply amount of the air-fuel mixture to the first burner and the supply amount of the air-fuel mixture to the second burner can be individually adjusted. Furthermore, since an opening / closing valve is provided at the connection portion between the one burner and the air supply passage, the cost can be reduced as compared with a case where a flow rate adjusting valve is also provided at this connection portion.

また、本発明において、第１バーナを第２バーナよりも定格燃焼量の大きなバーナとする場合は、給気路との接続部に開閉弁を設ける一方のバーナは第１バーナであることが望ましい。これによれば、第２バーナへの混合気の供給量を流量調節弁の制御で増減しても、定格燃焼量の大きな大型のバーナである第１バーナへの混合気の供給量は然程変化せず、第１バーナの燃焼量を要求燃焼量に近い値に維持できる。従って、ファン回転数と流量調節弁との正確な協調制御が不要になり、制御が容易になる。   In the present invention, when the first burner is a burner having a rated combustion amount larger than that of the second burner, it is desirable that one of the burners provided with an opening / closing valve at the connection portion with the air supply path is the first burner. . According to this, even if the supply amount of the air-fuel mixture to the second burner is increased or decreased by the control of the flow rate control valve, the supply amount of the air-fuel mixture to the first burner which is a large burner having a large rated combustion amount is not so much. The combustion amount of the first burner can be maintained at a value close to the required combustion amount without changing. This eliminates the need for accurate cooperative control between the fan speed and the flow rate control valve, and facilitates control.

本発明の実施形態の複合熱源機を示す模式的断面図。The typical sectional view showing the compound heat source machine of the embodiment of the present invention.

図１に示す本発明の実施形態の複合熱源機は、給湯用の第１熱交換器１１と、暖房用の第２熱交換器１２と、第１熱交換器１１を加熱する第１バーナ２１と、第２熱交換器１２を加熱する第２バーナ２２とを備えている。 Composite heat source unit of an embodiment of the present invention shown in FIG. 1, the heat from the first heat exchanger 1 1 for hot water supply, and the second heat exchanger 1 2 for heating, the first heat exchanger 1 1 It includes a 1 burner 2 1, and a second burner 2 2 for heating the second heat exchanger 1 2.

第１と第２の各バーナ２１，２２は、箱形のバーナボディ２１の一面を覆う燃焼板２２に形成した多数の炎孔（図示省略）から燃料ガスと一次空気との混合気を噴出して燃焼する全一次燃焼式バーナで構成され、燃焼板２２を下にした下向き姿勢で配置されている。そして、第１と第２の各バーナ２１，２２の下方の燃焼空間を囲う第１と第２の各燃焼筐３１，３２を設けて、第１と第２の各燃焼筐３１，３２の下部に第１と第２の各熱交換器１１，１２を収納している。また、第１と第２の両燃焼筐３１，３２の下端に連通する排気ダクト４を設けて、第１と第２の各バーナ２１，２２からの燃焼排ガスが第１と第２の各熱交換器１１，１２を介して排気ダクト４に流れるようにしている。 Each of the first and second burners 2 1 and 2 2 receives a mixture of fuel gas and primary air from a number of flame holes (not shown) formed in the combustion plate 22 that covers one surface of the box-shaped burner body 21. It is composed of an all primary combustion burner that jets and burns, and is disposed in a downward posture with the combustion plate 22 facing down. The first and second combustion housings 3 1 and 3 2 are provided so as to surround the combustion space below the first and second burners 2 1 and 2 2 , and the first and second combustion housings 3 are provided. The first and second heat exchangers 1 1 and 1 2 are accommodated in the lower portions of 1 and 3 2 . Further, an exhaust duct 4 communicating with the lower ends of both the first and second combustion casings 3 1 and 3 2 is provided, and the combustion exhaust gas from the first and second burners 2 1 and 2 2 is supplied to the first and second combustion casings 3 1 and 3 2 . The heat flows through the heat exchangers 1 1 , 1 2 in FIG.

尚、暖房よりも給湯の方が大きな加熱能力を要求されるため、第１バーナ２１を第２バーナ２２よりも定格燃焼量（最大燃焼量）の大きな大型のバーナとしている。また、排気ダクト４は、その内部に設けた仕切り板４１で第１バーナ２１からの燃焼排ガスが流れるダクト部と第２バーナ２２からの燃焼排ガスが流れるダクト部とに仕切られている。 Note that the order towards the hot water supply is required a large heat capacity, large large burner a first burner 2 1 rated combustion amount than the second burner 2 2 (maximum combustion amount) than heating. The exhaust duct 4 is partitioned into a duct section combustion exhaust gas from the duct section and the second burner 2 2 flowing in the partition plate 41 provided therein flue gas from the first burner 2 1 flows.

第１と第２の各熱交換器１１，１２は、図１の紙面直交方向に多数積層した吸熱フィン１１と、これら吸熱フィン１１を貫通する蛇行形状の吸熱管１２とで構成されている。第１熱交換器１１の吸熱管１２には、図示しないが、上流側の給水管と下流側の出湯管とが接続されており、出湯管の下流端の出湯栓を開いて第１熱交換器１１に通水したとき、第１バーナ２１が燃焼して、出湯栓から設定温度の湯が出湯される。第２熱交換器１２の吸熱管１２は、図示しないが、往き管と戻り管とを介して床暖房等の暖房回路に接続されており、暖房回路に第２熱交換器１２を介して温水を循環させて暖房を行う。 Each of the first and second heat exchangers 1 1 and 1 2 includes a plurality of heat absorption fins 11 stacked in a direction orthogonal to the paper surface of FIG. 1 and a meandering heat absorption pipe 12 that passes through the heat absorption fins 11. Yes. The first heat absorbing tube 12 of the heat exchanger 1 1, although not shown, the upstream side of the water supply pipe and the downstream hot water tube is connected, a first heat open pouring plug the downstream end of the hot water pipe when passed through the exchanger 1 1, the first burner 2 1 burns, hot water set temperature from hot water tap is tapped. The second heat absorbing tube 12 of the heat exchanger 1 2, although not shown, via the return forward pipe line is connected to a heating circuit of the floor heating or the like, the second heat exchanger 1 2 through the heating circuit Heat the water by circulating it.

また、第１と第２の両バーナ２１，２２には、共通の給気路５が接続されており、この給気路５に、一次空気を供給する単一のファン６を介設している。そして、ファン６の上流側の給気路５の部分に燃料ガスを供給するガス供給路７の下流端のガス出口７１を接続している。尚、ガス出口７１を接続する給気路５の部分は、断面積を狭めたベンチュリー部５１になっている。 A common air supply path 5 is connected to both the first and second burners 2 1 and 2 2 , and a single fan 6 for supplying primary air is interposed in the air supply path 5. doing. And the gas outlet 71 of the downstream end of the gas supply path 7 which supplies fuel gas to the part of the air supply path 5 upstream of the fan 6 is connected. The portion of the air supply path 5 connecting the gas outlet 71 is a venturi section 51 having a narrow cross-sectional area.

ガス供給路７には、元弁７２と、流量調節手段として二次ガス圧を大気圧と同等圧に調圧するゼロガバナ７３とが介設されている。ここで、燃料ガスの供給量は、二次ガス圧である大気圧とベンチュリー部５１に作用するファン６の吸引負圧との差圧に応じて変化することになる。そして、ファン吸引負圧はファン回転数に比例して変化するため、燃料ガスの供給量はファン回転数即ち一次空気の供給量に比例して変化し、混合気の空燃比が一定になる。   The gas supply path 7 is provided with a main valve 72 and a zero governor 73 that regulates the secondary gas pressure to a pressure equal to the atmospheric pressure as a flow rate adjusting means. Here, the supply amount of the fuel gas changes according to the differential pressure between the atmospheric pressure as the secondary gas pressure and the suction negative pressure of the fan 6 acting on the venturi unit 51. Since the fan suction negative pressure changes in proportion to the fan rotation speed, the fuel gas supply amount changes in proportion to the fan rotation speed, that is, the primary air supply amount, and the air-fuel ratio of the air-fuel mixture becomes constant.

また、第１バーナ２１と給気路５との接続部２１ａには、電磁ソレノイド等のアクチュエータ８１で駆動される開閉弁８が設けられ、第２バーナ２２と給気路５との接続部２２ａには、電動モータに送りネジ機構を組み合わせたアクチュエータ９１で駆動されるニードル式の流量調節弁９が設けられている。 Further, the connecting portion 2 1 a of the first burner 2 1 and air supply passage 5, the opening and closing valve 8 is provided which is driven by an actuator 81 such as an electromagnetic solenoid, a second burner 2 2 and supply passageway 5 The needle-type flow rate adjusting valve 9 driven by an actuator 91 that combines an electric motor and a feed screw mechanism is provided in the connecting portion 2 2 a.

そして、第１バーナ２１のみを燃焼させて第１熱交換器１１を加熱する給湯単独運転時は、開閉弁８を開弁させて第１バーナ２１に混合気を供給すると共に、流量調節弁９を全閉にして第２バーナ２２への混合気の供給を停止し、更に、第１バーナ２１への混合気の供給量を給湯要求燃焼量（設定温度の湯を出湯するのに必要な燃焼量）に対応する値になるようにファン６の回転数により調節する。また、第２バーナ２２のみを燃焼させて第２熱交換器１２を加熱する暖房単独運転時には、流量調節弁９を全開にして第２バーナ２２に混合気を供給すると共に、開閉弁８を閉弁して第１バーナ２１への混合気の供給を停止し、更に、第２バーナ２２への混合気の供給量を暖房要求燃焼量（暖房回路に設定温度の温水を供給するのに必要な燃焼量）に対応する値になるようにファン６の回転数により調節する。 Then, with only the first burner 2 1 by burning during the single hot water supply operation for heating the first heat exchanger 1 1, supplying the mixture off valve 8 in the first burner 2 1 is opened, the flow rate the regulating valve 9 to stop the supply of the air-fuel mixture to the second burner 2 2 in the fully closed, further, the supply amount of the mixture into the first burner 2 1 tapping hot water of the hot water supply demand combustion quantity (set temperature The amount of combustion necessary for the above is adjusted according to the number of rotations of the fan 6. Further, only the second burner 2 2 is burned during the heating alone operation for heating the second heat exchanger 1 2 supplies the mixture to the second burner 2 2 by the flow rate control valve 9 is fully opened, the opening and closing valve 8 stops supplying the mixture to the first burner 2 1 closes the further heating demand combustion amount the supply amount of the air-fuel mixture to the second burner 2 2 (supplying hot water set to the heating circuit temperature The amount of combustion required for this is adjusted by the number of revolutions of the fan 6 so as to be a value corresponding to the amount of combustion required.

第１バーナ２１を燃焼させて第１熱交換器１１を加熱すると共に、第２バーナ２２を燃焼させて第２熱交換器１２を加熱する給湯及び暖房の同時運転時には、開閉弁８を開弁させた状態で、第１バーナ２１への混合気の供給量を給湯要求燃焼量に対応する値になるようにファン６の回転数により調節する。この場合、流量調節弁９を全開にしたままでは、ファン６の回転数の増減で第２バーナ２２への混合気の供給量が増減して、第２バーナ２２の燃焼量を暖房要求燃焼量に維持できなくなる。そこで、本実施形態では、同時運転時、第２バーナ２２への混合気の供給量を暖房要求燃焼量に対応する値になるように流量調節弁９により調節する。このようにして、同時運転時にも、第１バーナ２１への混合気の供給量と第２バーナ２２への混合気の供給量とを各バーナ２１，２２の要求燃焼量に応じて個別に調節できる。 While heating the first heat exchanger 1 1 by burning a first burner 2 1, at the time of simultaneous operation of the hot water supply and heating to heat the second heat exchanger 1 2 by burning the second burner 2 2-off valve 8 in a state of being opened, adjusted by the rotation speed of the fan 6 such that the value corresponding to the supply amount of the mixture into the first burner 2 1 hot water supply demand combustion amount. In this case, while the flow rate control valve 9 was fully opened, and the supply amount of the mixture increases or decreases to the second burner 2 2 at a rotational speed increase or decrease of the fan 6, heating demand a second combustion amount of burners 2 2 The combustion amount cannot be maintained. Therefore, in this embodiment, to adjust the time of simultaneous operation, the flow rate control valve 9 to a value corresponding to the supply amount of the air-fuel mixture to the second burner 2 2 heating demand combustion amount. In this way, even during simultaneous operation, depending supplied amount of the mixture into the first burner 2 1 and the supply amount of the mixture of the second to the burner 2 2 to the required combustion amount of each burner 2 1, 2 2 Can be adjusted individually.

尚、第１バーナ２１と給気路５との接続部２１ａにも流量調節弁を設けることが考えられるが、本実施形態の如く、この接続部２１ａに設ける弁を開閉弁８とすれば、コストダウンを図ることができ有利である。 Incidentally, it is conceivable that also the connection portion 2 1 a of the first burner 2 1 and supply passageway 5 is provided a flow control valve, as in the present embodiment, the valve provided in the connecting portion 2 1 a closing valve If it is 8, cost reduction can be achieved and it is advantageous.

また、第１バーナ２１と給気路５との接続部２１ａに流量調節弁、第２バーナ２２と給気路５との接続部２２ａに開閉弁を設け、同時運転時に、第２バーナ２２への混合気の供給量をファン６の回転数により調節し、第１バーナ２１への混合気の供給量を流量調節弁により調節することも可能である。然し、これでは、大型の第１バーナ２１への混合気の供給量の調節で小型の第２バーナ２２への混合気の供給量が大きく変動するため、ファン回転数と流量調節弁との正確な協調制御が必要になり、制御が複雑になる。 The first burner 2 1 and supply passageway 5 and the connecting portion 2 1 a in the flow control valve, the opening and closing valve is provided, at the time of simultaneous operation to the connecting part 2 2 a and the second burner 2 2 and supply passageway 5 , the supply amount of the air-fuel mixture to the second burner 2 2 adjusted by the rotation speed of the fan 6, can be the supply amount of the mixture into the first burner 2 1 regulates the flow rate control valve. However, this in order to vary widely the supply amount of the air-fuel mixture in the regulation of the supply amount of the mixture to the second burner 2 2 compact to the first burner 2 1 large, and the fan speed and the flow rate control valve Accurate coordinated control is required, and the control becomes complicated.

これに対し、本実施形態によれば、小型の第２バーナ２２への混合気の供給量を流量調節弁９の制御で増減しても、大型の第１バーナ２１への混合気の供給量は然程変化せず、第１バーナ２１の燃焼量を要求燃焼量に近い値に維持できる。従って、ファン回転数と流量調節弁９との正確な協調制御が不要になり、制御が容易になる。 In contrast, according to the present embodiment, even if increase or decrease the supply amount of the air-fuel mixture to the second burner 2 2 small control flow control valve 9, the air-fuel mixture into the first burner 2 1 Large supply amount does not not that much change can be maintained first combustion amount of burners 2 1 to a value close to the required combustion amount. Therefore, accurate cooperative control between the fan speed and the flow rate adjusting valve 9 is not required, and the control is facilitated.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、ファン６の下流側の給気路５の部分にベンチュリー部を設け、ガス供給路７の下流端をこのベンチュリー部に臨ませると共に、ガス供給路７に流量調節手段として二次ガス圧をファン６の出口圧と同等圧に調圧するゼロガバナを介設してもよい。この場合、ファン６の出口圧とベンチュリー部との差圧がファン６による一次空気の供給量に比例するから、燃料ガスの供給量も一次空気の供給量に比例することになる。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, a venturi section is provided in the portion of the air supply path 5 on the downstream side of the fan 6, the downstream end of the gas supply path 7 faces the venturi section, and a secondary gas pressure is applied to the gas supply path 7 as a flow rate adjusting means. A zero governor that adjusts the pressure to be equal to the outlet pressure of the fan 6 may be interposed. In this case, since the differential pressure between the outlet pressure of the fan 6 and the venturi section is proportional to the primary air supply amount by the fan 6, the fuel gas supply amount is also proportional to the primary air supply amount.

また、ガス供給路７に流量調節手段として比例弁を介設し、燃料ガスの供給量を一次空気の供給量に比例するように比例弁で調節することも可能である。この場合、ガス供給路の下流端は、給気路５のファン上流側部分と下流側部分の何れに接続してもよい。更に、上記実施形態は、第１熱交換器１１を給湯用、第２熱交換器１２を暖房用とする給湯兼暖房の複合熱源機であるが、第２熱交換器１２を風呂追い焚き用等の暖房以外の用途のものとする複合熱源機にも同様に本発明を適用できる。 It is also possible to provide a proportional valve as a flow rate adjusting means in the gas supply path 7 and adjust the fuel gas supply amount with the proportional valve so as to be proportional to the primary air supply amount. In this case, the downstream end of the gas supply path may be connected to either the fan upstream side portion or the downstream side portion of the air supply path 5. Furthermore, the above-described embodiment, the first hot water supply heat exchanger 1 1, but the second heat exchanger 1 2 is a composite heat source unit of a hot water supply and heating to a heating, the second heat exchanger 1 2 bath The present invention can be similarly applied to a composite heat source machine that is used for a purpose other than heating such as reheating.

１１…第１熱交換器、１２…第２熱交換器、２１…第１バーナ、２２…第２バーナ、２１ａ…第１バーナと給気路との接続部、２２ａ…第２バーナと給気路との接続部、５…給気路、６…ファン、７…ガス供給路、７１…ガス出口（ガス供給路の下流端）、７３…ゼロガバナ（流量調節手段）、８…開閉弁、９…流量調節弁。 1 1 ... first heat exchanger, 1 2 ... second heat exchanger, 2 1 ... first burner, 2 2 ... second burner, 2 1 a ... connection portion between the first burner and the air supply passage, 2 2 a: connecting portion between second burner and air supply path, 5 ... air supply path, 6 ... fan, 7 ... gas supply path, 71 ... gas outlet (downstream end of gas supply path), 73 ... zero governor (flow rate adjusting means) ), 8 ... Open / close valve, 9 ... Flow control valve.

Claims (2)

第１と第２の２つの熱交換器と、第１熱交換器を加熱する第１バーナと、第２熱交換器を加熱する第２バーナとを備える複合熱源機であって、第１と第２の両バーナは全一次燃焼式バーナで構成され、これら両バーナに接続される共通の給気路に、一次空気を供給する単一のファンが介設され、燃料ガスを供給するガス供給路の下流端がファンの上流側又は下流側の給気路の部分に接続されて、一次空気と燃料ガスとの混合気が給気路を介して第１と第２の両バーナに供給されるようにし、ガス供給路に、混合気の空燃比が一定になるように一次空気の供給量に比例して燃料ガスの供給量を可変する流量調節手段を介設するものにおいて、
第１と第２の両バーナのうちの一方のバーナと給気路との接続部に開閉弁が設けられると共に、他方のバーナと給気路との接続部に流量調節弁が設けられ、
一方のバーナへの混合気の供給量は、ファンの回転数により調節され、他方のバーナへの混合気の供給量は、ファンの回転数と流量調節弁とにより調節されることを特徴とする複合熱源機。 A combined heat source apparatus comprising: first and second heat exchangers; a first burner that heats the first heat exchanger; and a second burner that heats the second heat exchanger, Both the second burners are composed of all primary combustion burners, and a common fan connected to both the burners is provided with a single fan for supplying primary air, and a gas supply for supplying fuel gas. The downstream end of the passage is connected to a portion of the air supply passage upstream or downstream of the fan, and a mixture of primary air and fuel gas is supplied to both the first and second burners via the air supply passage. In the gas supply path, a flow rate adjusting means that varies the supply amount of the fuel gas in proportion to the supply amount of the primary air so that the air-fuel ratio of the air-fuel mixture becomes constant is provided.
An opening / closing valve is provided at a connection portion between one of the first and second burners and the air supply passage, and a flow rate adjusting valve is provided at a connection portion between the other burner and the air supply passage,
The supply amount of the air-fuel mixture to one burner is adjusted by the rotational speed of the fan, and the supply amount of the air-fuel mixture to the other burner is adjusted by the rotational speed of the fan and the flow rate control valve. Combined heat source machine. 請求項１記載の複合熱源機であって、前記第１バーナを前記第２バーナよりも定格燃焼量の大きなバーナとするものにおいて、前記給気路との接続部に前記開閉弁を設ける前記一方のバーナは第１バーナであることを特徴とする請求項１記載の複合熱源機。   2. The composite heat source apparatus according to claim 1, wherein the first burner is a burner having a rated combustion amount larger than that of the second burner, and the one provided with the on-off valve at a connection portion with the air supply path. The combined heat source machine according to claim 1, wherein the burner is a first burner.
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