JP2020020509A - Forced air supply type combustion device - Google Patents

Forced air supply type combustion device Download PDF

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JP2020020509A
JP2020020509A JP2018143459A JP2018143459A JP2020020509A JP 2020020509 A JP2020020509 A JP 2020020509A JP 2018143459 A JP2018143459 A JP 2018143459A JP 2018143459 A JP2018143459 A JP 2018143459A JP 2020020509 A JP2020020509 A JP 2020020509A
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combustion
air
heat exchanger
downstream
combustion chamber
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木村 遇
Gu Kimura
遇 木村
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Rinnai Corp
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Abstract

To detect occurrence of blocking of a fin of a heat exchanger in a forced air supply type combustion device including: a combustion chamber for burning air-fuel mixture jetted out from a burner; a combustion gas passage in which combustion gas generated through combustion in the combustion chamber flows; the heat exchanger disposed in the combustion gas passage; a combustion fan for forcedly supplying air necessary for combustion; and an air passage that has a downstream end connected to a portion of the combustion gas passage downstream of the heat exchanger and in which air flows bypassing the combustion chamber.SOLUTION: A forced air supply type combustion device includes: a bypass hole 12 for communicating part of a combustion chamber 5 with an air passage 11; and temperature detection means 13 provided at a portion of the air passage 11 on the downstream side of the bypass hole 12. Whether or not a fin of the heat exchanger is blocked is determined based on a detection temperature obtained by the temperature detection means 13.SELECTED DRAWING: Figure 1

Description

本発明は、バーナと、バーナから噴出する混合気を燃焼させる燃焼室と、燃焼室での燃焼で生じた燃焼ガスが流れる燃焼ガス経路と、燃焼ガス経路に配置された熱交換器と、燃焼に必要な空気を強制的に供給する燃焼ファンとを備える強制給気式燃焼装置に関する。   The present invention relates to a burner, a combustion chamber for burning an air-fuel mixture ejected from the burner, a combustion gas path in which combustion gas generated by combustion in the combustion chamber flows, a heat exchanger disposed in the combustion gas path, and a combustion chamber. And a combustion fan for forcibly supplying necessary air to the combustion apparatus.

従来、この種の燃焼装置として、下流端が熱交換器の下流側の燃焼ガス経路の部分に接続された、燃焼室を迂回して空気が流れる空気路とを備えるものが知られている(例えば、特許文献1参照)。このものでは、熱交換器の下流側に空気路を介して流れる空気により燃焼ガスが希釈されて湿度が低下し、排気筒内での結露を抑制できる。   2. Description of the Related Art Conventionally, as this type of combustion device, there is known a combustion device including an air passage that has a downstream end connected to a portion of a combustion gas path downstream of a heat exchanger and that bypasses a combustion chamber and air flows ( For example, see Patent Document 1). In this case, the combustion gas is diluted by air flowing through the air passage downstream of the heat exchanger, whereby the humidity is reduced, and dew condensation in the exhaust pipe can be suppressed.

ところで、上記空気路を具備しない一般的な強制給気式燃焼装置では、熱交換器のフィン閉塞を生ずると、燃焼ファンによる送風量が減少し、燃焼ファンの仕事量の減少でファンモータの電流(ファン電流)が減少する。そこで、従来、ファン電流に基づいてフィン閉塞の有無を判別するものが知られている。   By the way, in a general forced air supply type combustion device having no air passage, when the fins of the heat exchanger are clogged, the amount of air blown by the combustion fan decreases, and the work amount of the combustion fan decreases. (Fan current) decreases. Therefore, conventionally, there has been known an apparatus that determines the presence or absence of a fin blockage based on a fan current.

然し、上記空気路を具備する強制給気式燃焼装置では、フィン閉塞を生じても、空気路を流れる空気量が増加するため、燃焼ファンによる送風量は左程減少せず、ファン電流ではフィン閉塞の発生を検知できなくなる。   However, in the forced air supply type combustion device having the above air passage, even if the fin is blocked, the amount of air flowing through the air passage increases, so that the amount of air blown by the combustion fan does not decrease to the left, and the fan current does not decrease. The occurrence of blockage cannot be detected.

特開2004−138326号公報JP 2004-138326 A

本発明は、以上の点に鑑み、空気路を具備する強制給気式燃焼装置であって、熱交換器のフィン閉塞の発生を検知できるようにしたものを提供することをその課題としている。   In view of the above, an object of the present invention is to provide a forced air supply type combustion device having an air passage, which can detect occurrence of fin blockage in a heat exchanger.

上記課題を解決するために、本発明は、バーナと、バーナから噴出する混合気を燃焼させる燃焼室と、燃焼室での燃焼で生じた燃焼ガスが流れる燃焼ガス経路と、燃焼ガス経路に配置された熱交換器と、燃焼に必要な空気を強制的に供給する燃焼ファンとを備える強制給気式燃焼装置であって、下流端が熱交換器の下流側の燃焼ガス経路の部分に接続された、燃焼室を迂回して空気が流れる空気路を備えるものにおいて、空気路に燃焼室の一部を連通させるバイパス孔と、バイパス孔の下流側の空気路の部分に設けられた温度検知手段とを備え、温度検知手段の検知温度に基づいて熱交換器のフィン閉塞の有無を判別することを特徴とする。   In order to solve the above-mentioned problems, the present invention provides a burner, a combustion chamber for burning an air-fuel mixture ejected from the burner, a combustion gas path through which combustion gas generated by combustion in the combustion chamber flows, and a combustion gas path. And a combustion fan for forcibly supplying air required for combustion, the downstream end of which is connected to a portion of a combustion gas path downstream of the heat exchanger. A bypass hole that communicates a part of the combustion chamber with the air passage, and a temperature sensor provided in a portion of the air passage downstream of the bypass hole. Means for judging the presence or absence of fin blockage of the heat exchanger based on the temperature detected by the temperature detecting means.

本発明によれば、熱交換器のフィン閉塞を生ずると、熱交換器での通気抵抗が増加するため、燃焼ガスの一部がバイパス孔を介して空気路に流れる。そのため、バイパス孔の下流側の空気路の部分に設けられた温度検知手段の検知温度が上昇し、これによりフィン閉塞の発生を検知できる。   According to the present invention, when the fins of the heat exchanger are clogged, the ventilation resistance in the heat exchanger increases, so that part of the combustion gas flows into the air passage through the bypass hole. For this reason, the temperature detected by the temperature detecting means provided in the portion of the air passage on the downstream side of the bypass hole increases, whereby it is possible to detect the occurrence of fin blockage.

本発明の実施形態の強制給気式燃焼装置の切断側面図。1 is a cut-away side view of a forced-supply-type combustion device according to an embodiment of the present invention. 実施形態の強制給気式燃焼装置の背面図。FIG. 2 is a rear view of the forced air supply type combustion device of the embodiment. 実施形態の強制給気式燃焼装置で行うフィン閉塞の判別処理を示すフロー図。FIG. 5 is a flowchart showing a fin blockage discrimination process performed by the forced air supply type combustion device of the embodiment.

図1及び図2を参照して、本発明の実施形態の強制給気式燃焼装置は、下側の第1筐体1と、第1筐体1の上の第2筐体1と、第2筐体1の上の第3筐体1と、第3筐体1から上方にのびる筒体2と、筒体2の上端に設けられた、モータ3aで駆動される燃焼ファン3とを備えている。 Figure 1 and with reference to FIG. 2, a forced air supply combustion apparatus according to an embodiment of the present invention includes a first housing 1 1 of the lower, second housing 1 2 on the first housing 1 1 When, a third housing 1 3 on the second housing 1 2, a tubular member 2 extending from the third housing 1 3 upward, is provided at the upper end of the cylindrical body 2, it is driven by a motor 3a And a combustion fan 3.

第1筐体1内には、前後方向(図1の左右方向)に長手のバーナ4が横方向(図1の紙面直交方向)に並べて複数並設されている。そして、第1筐体1のバーナ4より上方の内部空間でバーナ4から噴出する混合気を燃焼させる燃焼室5が構成され、燃焼室5での燃焼で生じた燃焼ガスが流れる燃焼ガス経路6が第2筐体1の内部空間、第3筐体1の内部空間及び筒体2の内部空間で構成される。 The first housing 1 1, and a plurality juxtaposed in the longitudinal direction (lateral direction in FIG. 1) longitudinal of the burner 4 is arranged in the lateral direction (direction orthogonal to a surface of FIG. 1). Then, the combustion chamber 5 to burn the mixture gas jetted from the burner 4 in the inner space of the above the first housing 1 1 of the burner 4 is configured, combustion gas path combustion gases flow generated in the combustion in the combustion chamber 5 6 is composed of the second internal space of the housing 1 2, the internal space and the internal space of the cylindrical member 2 of the third housing 1 3.

第1筐体1の下面は開放されている。そして、燃焼ファン3による吸引力で、各バーナ4に一次空気が強制的に供給されると共に、第1筐体1内のバーナ4下側に配置した分布板7に形成した多数の分布孔7aを介して燃焼室5に二次空気が強制的に供給されるようにしている。また、第1筐体1の前面下部にはガスマニホールド8が配置され、各バーナ4にガスマニホールド8に設けた各ノズルから燃料ガスが供給される。尚、バーナ4は濃淡バーナであり、ガスマニホールド8に、各バーナ4に対応して淡ノズル8aと濃ノズル8bとが設けられている。 A lower surface of the first housing 1 1 is open. The combustion fan 3 by the suction force due to each burner 4 with the primary air is forcibly supplied, a large number of distribution holes formed in the distribution plate 7 which is arranged in the burner 4 below the first housing 1 1 The secondary air is forcibly supplied to the combustion chamber 5 via 7a. Further, the first lower front of the housing 1 1 are disposed gas manifold 8, the fuel gas is supplied from the nozzles provided in the gas manifold 8 to each burner 4. The burners 4 are light and light burners, and the gas manifold 8 is provided with a light nozzle 8a and a dark nozzle 8b corresponding to each burner 4.

燃焼ガス経路6には、第2筐体1内に位置させて、給湯用その他の熱交換器9が配置されている。この熱交換器9は、横方向に多数積層した吸熱フィン9aと、これら吸熱フィン9aを貫通する吸熱パイプ9bとで構成されるフィンアンドチューブ型の熱交換器で構成されている。 The combustion gas path 6, by positioning the second housing 1 in 2, hot water supply and other heat exchanger 9 is disposed. The heat exchanger 9 is formed of a fin-and-tube heat exchanger composed of a plurality of heat absorbing fins 9a stacked in a lateral direction and a heat absorbing pipe 9b penetrating the heat absorbing fins 9a.

また、第1と第2の両筐体1の背面板1a,1aに隙間を存して対向する背面カバー10を設けて、これら背面板1a,1aと背面カバー10との間に、燃焼室5を迂回して空気が流れる空気路11を画成している。空気路11の下端、即ち、上流端は開放されており、上端、即ち、下流端は、熱交換器9の下流側の燃焼ガス経路6の部分である第3筐体1の内部空間に接続されている。これによれば、燃焼ファン3による吸引力で空気路11を介して第3筐体1の内部空間に空気が流入する。そして、熱交換器9を通過した後の燃焼ガスが空気で希釈されて湿度が低下し、燃焼ファン3の下流側の図示省略した排気筒内での結露を抑制することができる。 Further, the rear cover 10 opposite to exist a gap to the first and second rear plate 1 1 of the both bodies 1 1 of a, 1 2 a is provided, and back these rear plate 1 1 a, 1 2 a An air passage 11 is formed between the air passage 11 and the cover 10 so that the air flows around the combustion chamber 5. The lower end of the air passage 11, i.e., the upstream end is open, upper end, i.e., the downstream end, the inner space of the third housing 1 3 is a part of the combustion gas path 6 on the downstream side of the heat exchanger 9 It is connected. According to this, air flows into the internal space of the third case 1 3 via the air passage 11 by the suction force generated by the combustion fan 3. Then, the combustion gas after passing through the heat exchanger 9 is diluted with air to lower the humidity, and it is possible to suppress dew condensation in an exhaust pipe (not shown) downstream of the combustion fan 3.

ところで、燃焼装置をある程度使用すると、熱交換器9の吸熱フィン9a間の詰まり、即ち、フィン閉塞を生ずることがある。そこで、フィン閉塞の有無を判別できるように、本実施形態では、第1筐体1の背面板1aのバーナ4より上方部分に、燃焼室5の一部を空気路11に連通するバイパス孔12を形成すると共に、バイパス孔12の下流側の空気路11の部分に、サーミスタから成る温度検知手段13を設けている。 By the way, if the combustion device is used to some extent, clogging between the heat absorbing fins 9a of the heat exchanger 9, that is, fin blockage may occur. Therefore, as can be determined whether or not the fins closed, in the present embodiment, the upper portion than the burner 4 of the first housing 1 1 of the rear plate 1 1 a, communicating a portion of the combustion chamber 5 to the air passage 11 In addition to forming the bypass hole 12, a temperature detecting means 13 composed of a thermistor is provided in a portion of the air passage 11 downstream of the bypass hole 12.

熱交換器9のフィン閉塞を生ずると、熱交換器9での通気抵抗が増加するため、熱交換器9の上流側に位置する燃焼室5内の燃焼ガスの一部がバイパス孔12から空気路11に流れ、温度検知手段13の検知温度が上昇する。そこで、本実施形態では、図示省略したコントローラにより、バーナ4の燃焼時に図3に示すフィン閉塞の判別処理を行うようにした。この判別処理では、先ず、STEP1で温度検知手段13の検知温度THを読み込み、次に、STEP2に進み、検知温度THが所定の閾値YTH以上になったか否かを判別する。そして、TH<YTHであれば、STEP1に戻るが、TH≧YTHになったときは、フィン閉塞が発生したと判断し、STEP3に進んで異常表示を行うと共にバーナ6を消火する。   When the fins of the heat exchanger 9 are clogged, the ventilation resistance in the heat exchanger 9 increases, so that part of the combustion gas in the combustion chamber 5 located upstream of the heat exchanger 9 It flows into the path 11 and the temperature detected by the temperature detecting means 13 rises. Therefore, in the present embodiment, the fin blockage determination processing shown in FIG. 3 is performed by the controller (not shown) when the burner 4 burns. In this determination processing, first, the detected temperature TH of the temperature detecting means 13 is read in STEP1, and then, the process proceeds to STEP2, and it is determined whether the detected temperature TH has become equal to or higher than a predetermined threshold YTH. If TH <YTH, the process returns to STEP 1. However, if TH ≧ YTH, it is determined that the fin has clogged, and the process proceeds to STEP 3 to perform an abnormality display and extinguish the burner 6.

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、上記実施形態では、燃焼ガス経路6の下流側に燃焼ファン3を設けて、燃焼に必要な空気を吸込み方式で供給するようにしたが、燃焼室5の上流側に燃焼ファンを設けて、燃焼に必要な空気を押し込み方式で供給するようにしてもよい。この場合、空気路11の上流端に燃焼ファンからの空気の一部が押し込まれるようにする。   Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited thereto. For example, in the above-described embodiment, the combustion fan 3 is provided on the downstream side of the combustion gas path 6 to supply air required for combustion by a suction method. However, the combustion fan is provided on the upstream side of the combustion chamber 5. Alternatively, the air required for combustion may be supplied in a forced manner. In this case, a part of the air from the combustion fan is pushed into the upstream end of the air passage 11.

また、上記実施形態では、第1と第2の両筐体1,1の背面側に空気路11を設けているが、両筐体1,1の前面側や側面側に空気路を設けることも可能である。 In the above embodiment, both the first and second housings 1 1, 1 2 is provided with the air passage 11 on the rear side, air the housings 1 1, 1 2 of the front side and side surface side Roads can also be provided.

3…燃焼ファン、4…バーナ、5…燃焼室、6…燃焼ガス経路、11…空気路、12…バイパス路、13…温度検知手段。
3 combustion fan, 4 burner, 5 combustion chamber, 6 combustion gas path, 11 air path, 12 bypass path, 13 temperature detection means.

Claims (1)

バーナと、バーナから噴出する混合気を燃焼させる燃焼室と、燃焼室での燃焼で生じた燃焼ガスが流れる燃焼ガス経路と、燃焼ガス経路に配置された熱交換器と、燃焼に必要な空気を強制的に供給する燃焼ファンとを備える強制給気式燃焼装置であって、下流端が熱交換器の下流側の燃焼ガス経路の部分に接続された、燃焼室を迂回して空気が流れる空気路を備えるものにおいて、
空気路に燃焼室の一部を連通させるバイパス孔と、バイパス孔の下流側の空気路の部分に設けられた温度検知手段とを備え、温度検知手段の検知温度に基づいて熱交換器のフィン閉塞の有無を判別することを特徴とする燃焼装置。
A burner, a combustion chamber for burning an air-fuel mixture ejected from the burner, a combustion gas path through which combustion gas generated by combustion in the combustion chamber flows, a heat exchanger disposed in the combustion gas path, and air required for combustion. And a combustion fan for forcibly supplying air, wherein the air flows around the combustion chamber, the downstream end of which is connected to a portion of the combustion gas path on the downstream side of the heat exchanger. In those having an air passage,
A bypass hole that communicates a part of the combustion chamber with the air passage; and a temperature detection unit provided in a portion of the air passage downstream of the bypass hole, and a fin of the heat exchanger based on a temperature detected by the temperature detection unit. A combustion device for determining the presence or absence of blockage.
JP2018143459A 2018-07-31 2018-07-31 Forced air supply type combustion device Pending JP2020020509A (en)

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