JP2020003148A - Water heater - Google Patents

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JP2020003148A
JP2020003148A JP2018123484A JP2018123484A JP2020003148A JP 2020003148 A JP2020003148 A JP 2020003148A JP 2018123484 A JP2018123484 A JP 2018123484A JP 2018123484 A JP2018123484 A JP 2018123484A JP 2020003148 A JP2020003148 A JP 2020003148A
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stopper
mounting member
exhaust
flap
water heater
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JP7061366B2 (en
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友助 柿崎
Yusuke Kakizaki
友助 柿崎
武司 横山
Takeshi Yokoyama
武司 横山
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Paloma Co Ltd
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Paloma Co Ltd
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Abstract

To provide a water heater which effectively prevents reverse flow in an exhaust pipe and enables a stopper to an attachment member to be formed in a simple structure thereby enabling easy assembly.SOLUTION: An exhaust pipe 9 includes: an attachment member 31 attached to an inner peripheral surface 9a of the exhaust pipe 9; and a flap 33 which is rotatably supported by the attachment member 31 and can open or close an exhaust passage in the exhaust pipe 9. The flap 33 is provided with an adverse wind stop mechanism 30 in which rotation of gas to the reverse flow side is restricted by a closing side stopper 41 provided at the attachment member 31. The closing side stopper 41 is provided at an upper end of the attachment member 31. The flap 33 is supported by the attachment member 31 at a height above the closing side stopper 41 in a closing position and contacts with the closing side stopper 41 from above.SELECTED DRAWING: Figure 4

Description

本発明は、屋内から燃焼用空気を得てバーナを燃焼させ、燃焼排気を屋外に排出する屋内設置式の給湯器に関する。   The present invention relates to an indoor-installed water heater that obtains combustion air from indoors, burns a burner, and discharges combustion exhaust to the outside.

給湯器には、屋内から燃焼用空気を得てバーナを燃焼させ、発生した燃焼排気を排気筒を介して屋外に排出する屋内設置式（半密閉式ともいう）のものが知られている。
このような給湯器では、屋内で換気扇を使用すると屋内が負圧となり、排気筒から外気が逆流して吸い込まれるため、冬季には器具内で凍結が生じるおそれがある。よって、排気筒内には外気の逆流を防止するための工夫が施されている。例えば特許文献１には、排気筒に内接させた取付部材に、回動軸を介して羽根板を回転可能に保持させると共に、取付部材に、羽根板の排出方向への回転位置を規制する順風ストッパと、羽根板の逆流方向への回転を阻止する逆風ストッパとを設けてなる逆流（逆風）防止機構の発明が開示されている。 2. Description of the Related Art As a water heater, there is known an indoor installation type (also referred to as a semi-closed type) in which combustion air is obtained indoors to burn a burner and generated combustion exhaust gas is discharged outside through an exhaust pipe.
In such a water heater, if a ventilation fan is used indoors, negative pressure is generated in the room, and outside air flows backward from the exhaust stack and is sucked. Therefore, a device for preventing the backflow of the outside air is provided in the exhaust pipe. For example, in Patent Literature 1, a mounting member inscribed in an exhaust pipe holds a blade plate rotatably via a rotation shaft, and the mounting member regulates a rotational position of the blade plate in a discharge direction. An invention of a backflow (backwind) prevention mechanism comprising a forward wind stopper and a backward wind stopper for preventing the blade plate from rotating in the backward flow direction is disclosed.

特許第３９０５３２８号公報Japanese Patent No. 3905328

特許文献１の逆流防止機構は、取付部材の内側で羽根板が回動軸により支持されているため、取付部材と干渉しないように羽根板を取付部材より一回り小さく形成する必要がある。よって、逆風ストッパに当接する閉塞位置でも羽根板と排気筒の内周面との間に大きな隙間が生じて逆流を十分に阻止できない場合がある。
また、逆風ストッパを取付部材の左右方向の中央で排気筒の中心に向けて突設しているため、取付部材の加工が複雑になる上、取付部材の組み付け時には取付部材から飛び出す逆風ストッパに作業者の手や工具が引っ掛かるおそれが生じ、組み付け作業がやりにくくなっている。 In the backflow prevention mechanism of Patent Literature 1, since the blade is supported by the rotating shaft inside the mounting member, it is necessary to make the blade one size smaller than the mounting member so as not to interfere with the mounting member. Therefore, a large gap may be formed between the vane plate and the inner peripheral surface of the exhaust pipe even at the closed position where it comes into contact with the backwind stopper, and the backflow may not be sufficiently prevented.
In addition, since the reverse wind stopper is protruded from the center of the mounting member in the left-right direction toward the center of the exhaust pipe, the processing of the mounting member becomes complicated. There is a risk that the hand or tool of the operator may be caught, making it difficult to perform the assembling work.

そこで、本発明は、排気筒での逆流を効果的に阻止できると共に、取付部材へのストッパも簡単な構成で形成でき、組み付けも容易に行える逆風止め機構を備えた給湯器を提供すること目的としたものである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water heater having a reverse wind stop mechanism that can effectively prevent backflow in an exhaust pipe, can form a stopper to a mounting member with a simple structure, and can easily assemble the water heater. It is what it was.

上記目的を達成するために、請求項１に記載の発明は、バーナ及び熱交換器を収容する筐体と、筐体から上向きに突設され、熱交換器を通過したバーナの燃焼排気を屋外に排出する排気筒と、排気筒内に設けられ、筐体側への気体の逆流を防止する逆風止め機構と、を有し、逆風止め機構は、排気筒の内周面に取り付けられた取付部材と、その取付部材に回転可能に支持されて排気筒内の排気流路を開閉可能なフラップとを含み、フラップは、排気流路を閉塞する閉塞位置から燃焼排気の排出側への回転が許容される一方、取付部材に設けたストッパにより、閉塞位置から気体の逆流側への回転が規制される給湯器であって、
ストッパは、取付部材の上端に設けられ、フラップは、閉塞位置でストッパよりも上方となる高さで取付部材に支持されてストッパに上方から当接することを特徴とする。
請求項２に記載の発明は、請求項１の構成において、取付部材は、排気筒の内周面から離間する離間部分を有し、離間部分にストッパが設けられると共に、内周面側へ折曲されて平面視で離間部分と内周面との隙間を埋める張り出し部が形成されていることを特徴とする。
請求項３に記載の発明は、請求項１又は２の構成において、ストッパは、取付部材の上端から上方へ突出する凸形状であることを特徴とする。
請求項４に記載の発明は、請求項３の構成において、凸形状は、曲線状に形成されることを特徴とする。 Means for Solving the Problems In order to achieve the above object, an invention according to claim 1 includes a housing for accommodating a burner and a heat exchanger, and a combustion exhaust of the burner protruding upward from the housing and passing through the heat exchanger. Exhaust pipe, and a reverse wind-stop mechanism provided in the exhaust pipe to prevent backflow of gas to the housing side, and the reverse wind-prevention mechanism is attached to an inner peripheral surface of the exhaust pipe. And a flap rotatably supported by the mounting member and capable of opening and closing the exhaust flow path in the exhaust cylinder, wherein the flap is allowed to rotate from the closed position for closing the exhaust flow path to the exhaust side of the combustion exhaust gas. On the other hand, a water heater in which rotation from the closed position to the reverse flow side of the gas is regulated by a stopper provided on the mounting member,
The stopper is provided at the upper end of the mounting member, and the flap is supported by the mounting member at a height higher than the stopper at the closed position and abuts the stopper from above.
According to a second aspect of the present invention, in the configuration of the first aspect, the mounting member has a separated portion separated from the inner peripheral surface of the exhaust pipe, a stopper is provided at the separated portion, and the mounting member is folded toward the inner peripheral surface. An overhanging portion is formed to fill the gap between the separated portion and the inner peripheral surface in a plan view when bent.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the stopper has a convex shape protruding upward from an upper end of the mounting member.
According to a fourth aspect of the present invention, in the configuration of the third aspect, the convex shape is formed in a curved shape.

請求項１に記載の発明によれば、逆風止め機構のストッパは、取付部材の上端に設けられ、フラップは、閉塞位置でストッパよりも上方となる高さで取付部材に支持されてストッパに上方から当接することで、取付部材との干渉を避けてフラップを排気筒内で大きく形成することができる。よって、排気筒での逆流を効果的に阻止可能となる。また、ストッパも取付部材の上端へ簡単な構成で形成でき、取付部材から前後や左右に突出しないので、ストッパが邪魔にならずに組み付けも容易に行える。
請求項２に記載の発明によれば、請求項１の効果に加えて、取付部材の離間部分にストッパが設けられると共に、平面視で排気筒の内周面との隙間を埋める張り出し部が形成されているので、離間部分でフラップを下方から安定して支持できると共に、離間部分を設けても内周面との隙間をなくすことができ、外気の逆流をより効果的に阻止可能となる。
請求項３に記載の発明によれば、請求項１又は２の効果に加えて、ストッパは、取付部材の上端から上方へ突出する凸形状となっているので、フラップとの接触面積が小さくて済む。よって、燃焼排気に含まれる水分がフラップとストッパとの間で結露・凍結してフラップが閉塞位置で固着するおそれが低減される。
請求項４に記載の発明によれば、請求項３の効果に加えて、ストッパの凸形状は、曲線状に形成されることで、フラップとの接触面積がより小さくなると共に、取付作業の際に作業者の手等が引っ掛かったりするおそれがなくなる。 According to the first aspect of the present invention, the stopper of the reverse wind prevention mechanism is provided at the upper end of the mounting member, and the flap is supported by the mounting member at a height that is higher than the stopper at the closed position and is supported by the stopper. The flaps can be formed large in the exhaust cylinder by avoiding interference with the mounting member. Therefore, backflow in the exhaust stack can be effectively prevented. Also, the stopper can be formed on the upper end of the mounting member with a simple configuration, and does not protrude from the mounting member back and forth or right and left, so that the stopper can be easily assembled without disturbing.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a stopper is provided at the separated portion of the mounting member, and a projecting portion that fills a gap with the inner peripheral surface of the exhaust pipe in a plan view is formed. As a result, the flap can be stably supported from below at the separated portion, and even if the separated portion is provided, the gap with the inner peripheral surface can be eliminated, and the backflow of the outside air can be more effectively prevented.
According to the third aspect of the invention, in addition to the effects of the first or second aspect, the stopper has a convex shape protruding upward from the upper end of the mounting member, so that the contact area with the flap is small. I'm done. Therefore, the possibility that moisture contained in the combustion exhaust is condensed and frozen between the flap and the stopper and the flap is fixed at the closed position is reduced.
According to the fourth aspect of the present invention, in addition to the effect of the third aspect, the convex shape of the stopper is formed in a curved shape, so that the contact area with the flap becomes smaller and at the time of mounting work. This eliminates the risk of the operator's hand or the like being caught.

給湯器の正面図である。It is a front view of a water heater. 給湯器の平面図である。It is a top view of a water heater. フロントカバーを外した状態の正面図である。It is a front view in the state where the front cover was removed. （Ａ）は排気筒内でフラップが閉塞位置にある逆風止め機構の背面図、（Ｂ）はその右側面図である。(A) is a rear view of the reverse wind stop mechanism in which the flap is in the closed position in the exhaust pipe, and (B) is a right side view thereof. （Ａ）はフラップが閉塞位置にある逆風止め機構の斜視図、（Ｂ）はフラップが開放位置にある逆風止め機構の斜視図である。(A) is a perspective view of the reverse wind-prevention mechanism in which the flap is in the closed position, and (B) is a perspective view of the reverse wind-prevention mechanism in which the flap is in the open position. （Ａ）はフラップが閉塞位置にある逆風止め機構の正面図、（Ｂ）はその平面図、（Ｃ）はその底面図である。(A) is a front view of the reverse wind stop mechanism in which the flap is in the closed position, (B) is a plan view thereof, and (C) is a bottom view thereof. （Ａ）は排気筒内でフラップが開放位置にある逆風止め機構の背面図、（Ｂ）はその右側面図である。(A) is a rear view of the reverse wind stop mechanism in which the flap is in the open position in the exhaust pipe, and (B) is a right side view thereof. （Ａ）はフラップが開放位置にある逆風止め機構の正面図、（Ｂ）はその平面図、（Ｃ）はその底面図である。(A) is a front view of the reverse wind stop mechanism with the flap at the open position, (B) is a plan view thereof, and (C) is a bottom view thereof.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、給湯器の一例を示す正面図、図２は平面図である。この給湯器１は、前面を除く５面を閉塞した箱本体３と、箱本体３の前面を閉塞するフロントカバー４とからなる筐体２を有する。筐体２内には、フロントカバー４を外した状態の図３に示すように、下方からバーナユニット６、熱交換器７、排気フード８を備えた燃焼装置５が設置されて、排気フード８の上端に設けた排気筒９が、箱本体３の上板を貫通して上方へ突出している。箱本体３の背面上下には、屋内の壁等に設置するための取付金具１０，１０が設けられ、箱本体３の背板には、複数の給気口１１，１１・・が形成されている。
箱本体３の底面には、外部のガス配管が接続されるガス接続口１２と、外部の給水配管が接続される給水接続口１３と、複数の給湯栓を備えた外部の給湯配管が接続される給湯接続口１４及び戻り接続口１５とが設けられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a water heater, and FIG. 2 is a plan view. The water heater 1 has a housing 2 composed of a box body 3 whose five faces except for the front face are closed, and a front cover 4 that closes the front face of the box body 3. As shown in FIG. 3 with the front cover 4 removed, a combustion device 5 including a burner unit 6, a heat exchanger 7, and an exhaust hood 8 is installed in the housing 2 from below. An exhaust cylinder 9 provided at the upper end of the box body 3 penetrates the upper plate of the box body 3 and protrudes upward. At the top and bottom of the back of the box body 3, mounting brackets 10, 10 for installation on an indoor wall or the like are provided, and a plurality of air supply ports 11, 11,. I have.
A gas connection port 12 to which an external gas pipe is connected, a water supply port 13 to which an external water supply pipe is connected, and an external hot water supply pipe having a plurality of hot water taps are connected to the bottom surface of the box body 3. A hot water supply connection port 14 and a return connection port 15 are provided.

バーナユニット６には、ガス接続口１２と接続されるガス管１６が接続されると共に、燃焼用空気を供給するためのファン１７が設けられている。
熱交換器７は、図示しない複数のフィンを蛇行状に貫通する伝熱管１８を有し、伝熱管１８の入側端部には、給水接続口１３と接続される給水管１９が接続され、伝熱管１８の出側端部には、給湯接続口１４と接続される出湯管２０が接続されている。戻り接続口１５と給水管１９との間には、ポンプ２２を備えた循環用配管２１が接続されている。
すなわち、この給湯器１は、給水管１９から供給される水を熱交換器７で加熱して出湯管２０から出湯すると共に、ポンプ２２の運転により、出湯した湯を外部の給湯配管から循環用配管２１を介して給水管１９に戻して熱交換器７で再加熱する循環式となっている。 The burner unit 6 is connected to a gas pipe 16 connected to the gas connection port 12 and is provided with a fan 17 for supplying combustion air.
The heat exchanger 7 has a heat transfer tube 18 that penetrates a plurality of fins (not shown) in a meandering shape, and a water supply tube 19 connected to the water supply connection port 13 is connected to an input end of the heat transfer tube 18. A tapping pipe 20 connected to the hot water supply connection port 14 is connected to an outlet end of the heat transfer pipe 18. A circulation pipe 21 including a pump 22 is connected between the return connection port 15 and the water supply pipe 19.
That is, the water heater 1 heats the water supplied from the water supply pipe 19 by the heat exchanger 7 and discharges the water from the water discharge pipe 20, and operates the pump 22 to circulate the discharged hot water from the external hot water supply pipe. It is a circulation type in which the heat is returned to the water supply pipe 19 via the pipe 21 and reheated by the heat exchanger 7.

そして、排気筒９には、屋外に開放される図示しないダクトが接続され、排気筒９内には、図４，５に示すように、ダクトからの外気の逆流を防止するための逆風止め機構３０が設けられている。この逆風止め機構３０は、排気筒９内に固定される取付部材３１と、取付部材３１へ左右方向に取り付けられる支持軸３２と、支持軸３２へ回転可能に取り付けられるフラップ３３とを備えてなる。
まず、取付部材３１は、金属製の帯板を折曲形成して、排気筒９の内周面９ａの前側に沿って円弧状に形成される円弧状部３４と、円弧状部３４の両端から後方へ延びて内周面９ａから離間する左右一対の直線部３５，３５とを有している。円弧状部３４における周方向の中央には、排気筒９へネジ止めするための透孔３６が形成されている。 A duct (not shown) that is open to the outside is connected to the exhaust pipe 9, and a reverse breeze stop mechanism for preventing backflow of outside air from the duct is provided in the exhaust pipe 9 as shown in FIGS. 30 are provided. The reverse wind prevention mechanism 30 includes a mounting member 31 fixed in the exhaust pipe 9, a support shaft 32 mounted on the mounting member 31 in the left-right direction, and a flap 33 rotatably mounted on the support shaft 32. .
First, the mounting member 31 is formed by bending a metal band plate to form an arc along the front side of the inner peripheral surface 9 a of the exhaust pipe 9, and both ends of the arc 34. And a pair of left and right straight portions 35, 35 extending rearward from the inner peripheral surface 9a and separated from the inner peripheral surface 9a. At the center in the circumferential direction of the arc-shaped portion 34, a through hole 36 for screwing to the exhaust pipe 9 is formed.

また、左右の直線部３５，３５における円弧状部３４との連結際には、上方へ突出した後、後方へ折曲する倒Ｌ字状の開側ストッパ３７，３７がそれぞれ形成されている。この開側ストッパ３７の後方への突出端は円形状となっている。開側ストッパ３７，３７よりも後方で開側ストッパ３７，３７よりも下方位置には、図６にも示すように、左右方向に貫通して内側へ突出する小筒部３８，３８が形成されて、この小筒部３８，３８間に支持軸３２が貫通して左右方向に支持されている。小筒部３８，３８を貫通する支持軸３２の両端には、抜け止め用のキャップ３９と止めリング４０とがそれぞれ嵌着されている。   In addition, when connecting the left and right straight portions 35, 35 to the arc-shaped portions 34, inverted L-shaped open-side stoppers 37, 37 that protrude upward and bend rearward are formed, respectively. The rearward projecting end of the open-side stopper 37 has a circular shape. As shown in FIG. 6, small cylindrical portions 38, 38 penetrating in the left-right direction and projecting inward are formed behind the open-side stoppers 37, 37 and below the open-side stoppers 37, 37. The support shaft 32 penetrates between the small cylindrical portions 38, 38 and is supported in the left-right direction. At both ends of the support shaft 32 penetrating the small cylinder portions 38, 38, a cap 39 for retaining the stopper and a retaining ring 40 are fitted respectively.

さらに、直線部３５，３５は、小筒部３８，３８より後方では、上端高さが円弧状部３４の上端よりも低く、且つ支持軸３２よりも高く形成されて、各直線部３５の上端における前後方向の略中央部には、当該上端と前後端が曲線状に繋がり、上端が曲線状に膨出する凸形状の閉側ストッパ４１がそれぞれ形成されている。この閉側ストッパ４１，４１の上端高さは、支持軸３２よりも高くなっている。
また、各直線部３５の後端は、排気筒９の内周面に沿って内側へ折曲される折曲片４２，４２となっており、各折曲片４２の先端には、排気筒９へネジ止めするための半円状の切欠き４３がそれぞれ形成されている。
そして、各直線部３５の下端には、外側へ折曲されて円弧状の外周が排気筒９の内周面９ａに当接し、取付部材３１の取り付け状態で直線部３５と内周面９ａとの隙間を塞ぐ張り出し部４４がそれぞれ形成されている。 Further, the straight portions 35, 35 are formed such that, at the rear of the small cylindrical portions 38, 38, the upper end height is lower than the upper end of the arc-shaped portion 34 and higher than the support shaft 32, and the upper end of each linear portion 35 is formed. At the substantially central portion in the front-rear direction, a convex closed side stopper 41 is formed, in which the upper end and the front and rear ends are connected in a curved shape and the upper end swells in a curved shape. The upper ends of the closing-side stoppers 41, 41 are higher than the support shaft 32.
The rear end of each straight portion 35 is formed with bent pieces 42, 42 bent inward along the inner peripheral surface of the exhaust pipe 9. A semicircular notch 43 for screwing to 9 is formed.
At the lower end of each linear portion 35, the arc-shaped outer periphery is bent outward and abuts against the inner peripheral surface 9 a of the exhaust pipe 9, and when the mounting member 31 is attached, the linear portion 35 and the inner peripheral surface 9 a Projecting portions 44 for closing the gaps are formed.

フラップ３３は、平面視で取付部材３１の円弧状部３４と左右の直線部３５，３５の小筒部３８，３８との間に収まる前側部４５と、前側部４５に連設され、左右の直線部３５，３５を越えて左右が外側へ張り出すと共に、後端が排気筒９の内周面９ａに沿った半円状となる後側部４６とを備えた板状体で、前側部４５の左右には、下方へ折曲される連結片４７，４７が形成されて、この連結片４７，４７に支持軸３２が貫通することで、フラップ３３は支持軸３２を中心として回転可能に支持される。
後側部４６の左右には、図４及び図６に示す閉塞位置での平面視で直線部３５，３５に上方からオーバーラップして開側ストッパ３７，３７の後方に位置する前翼部４８，４８がそれぞれ形成されている。また、後側部４６の左右で前翼部４８，４８の後方には、同じく閉塞位置での平面視で直線部３５，３５の閉側ストッパ４１，４１に上方からオーバーラップする後翼部４９，４９がそれぞれ一体形成されている。 The flap 33 is connected to the front side portion 45 and the front side portion 45 which fits between the arc-shaped portion 34 of the mounting member 31 and the small cylindrical portions 38, 38 of the left and right straight portions 35, 35 in plan view. A left and right side protruding outward beyond the straight portions 35, 35, and a rear end 46 having a semicircular rear end along the inner peripheral surface 9a of the exhaust pipe 9; Connection pieces 47, 47 bent downward are formed on the left and right sides of the 45, and the support shaft 32 penetrates the connection pieces 47, 47 so that the flap 33 can rotate about the support shaft 32. Supported.
On the left and right sides of the rear side portion 46, front wing portions 48 which overlap the linear portions 35, 35 from above in plan view at the closed position shown in FIGS. 4 and 6 and are located behind the open side stoppers 37, 37. , 48 are formed. Further, right and left of the rear side portion 46 and behind the front wing portions 48, 48, rear wing portions 49 overlapping from above the closed side stoppers 41, 41 of the linear portions 35, 35 in plan view at the closed position. , 49 are integrally formed.

よって、フラップ３３は、図４及び図５（Ａ）、図６に示すように後翼部４９，４９が閉側ストッパ４１，４１に上方から当接して直線部３５，３５及び支持軸３２よりも上方で水平に支持される閉塞位置と、図５（Ｂ）及び図７，８に示すように、後側部４６が上方へ回転して前翼部４８，４８が開側ストッパ３７，３７に当接して傾斜状態となる開放位置との間で支持軸３２を中心として回転可能となる。燃焼排気が排出されない状態では、フラップ３３は自重によって閉塞位置に移動して当該位置を維持する。この閉塞位置で排気筒９内は、図６に示すように、取付部材３１とフラップ３３の前側部４５との間の僅かな隙間を残して略閉塞される。   Therefore, as shown in FIGS. 4, 5A and 6, the rear wings 49, 49 come into contact with the closing-side stoppers 41, 41 from above, and the flap 33 is moved from the straight parts 35, 35 and the support shaft 32. 5B and FIGS. 7 and 8, the rear side portion 46 rotates upward, and the front wing portions 48 and 48 open side stoppers 37 and 37, respectively. , And can rotate about the support shaft 32 between an open position where the support shaft 32 is in an inclined state by contact with the support shaft 32. In a state where the combustion exhaust is not discharged, the flap 33 moves to the closed position by its own weight and maintains the closed position. As shown in FIG. 6, the inside of the exhaust pipe 9 is substantially closed at this closed position except for a slight gap between the mounting member 31 and the front side 45 of the flap 33.

以上の如く構成された給湯器１においては、前述のように給水管１９から供給される水を熱交換器７で加熱して出湯管２０から出湯する運転を行うと、熱交換器７を通過したバーナの燃焼排気が排気フード８から排気筒９に進入する。このとき逆風止め機構３０では、燃焼排気の圧力によってフラップ３３が、図７，８に示すように、最大で後側部４６の前翼部４８，４８が開側ストッパ３７，３７に当接する開放位置へ回転して排気筒９内を開放するため、燃焼排気はそのまま排気筒９を通過してダクトを介して屋外へ排出される。
一方、給湯器１を運転しない状態で換気扇を使用する等して屋内が負圧となると、ダクトから外気が逆流して吸い込まれるが、燃焼排気が流れない排気筒９ではフラップ３３が、後翼部４９，４９が閉側ストッパ４１，４１に当接する閉塞位置に維持されているため、逆風止め機構３０を通過する外気の量が非常に少なくなる。よって、冬季であっても器具内に進入した外気によって凍結するおそれが低減される。 In the water heater 1 configured as described above, when the water supplied from the water supply pipe 19 is heated by the heat exchanger 7 and the hot water is supplied from the hot water pipe 20 as described above, the water passes through the heat exchanger 7. The burned combustion exhaust from the burner enters the exhaust stack 9 from the exhaust hood 8. At this time, in the reverse wind stop mechanism 30, the flap 33 is opened by the pressure of the combustion exhaust gas so that the front wings 48, 48 of the rear side 46 contact the open side stoppers 37, 37 at the maximum, as shown in FIGS. Since it rotates to the position and opens the exhaust pipe 9, the combustion exhaust gas passes through the exhaust pipe 9 as it is and is discharged outside via a duct.
On the other hand, when the indoor becomes a negative pressure by using a ventilation fan or the like while the water heater 1 is not operated, the outside air flows backward from the duct and is sucked in, but the flap 33 in the exhaust pipe 9 in which the combustion exhaust does not flow has the rear wing. Since the portions 49, 49 are maintained in the closed position in contact with the closing-side stoppers 41, 41, the amount of outside air passing through the backwind prevention mechanism 30 is extremely small. Therefore, even in the winter season, the possibility of freezing due to the outside air entering the device is reduced.

このように、上記形態の給湯器１によれば、逆風止め機構３０の閉側ストッパ４１は、取付部材３１の上端に設けられ、フラップ３３は、閉塞位置で閉側ストッパ４１よりも上方となる高さで取付部材３１に支持されて閉側ストッパ４１に上方から当接することで、取付部材３１との干渉を避けてフラップ３３を排気筒９内で大きく形成することができる。よって、排気筒９での逆流を効果的に阻止可能となる。また、閉側ストッパ４１も取付部材３１の上端へ簡単な構成で形成でき、取付部材３１から前後や左右に突出しないので、閉側ストッパ４１が邪魔にならずに組み付けも容易に行える。   Thus, according to the water heater 1 of the above-described embodiment, the closing stopper 41 of the reverse wind prevention mechanism 30 is provided at the upper end of the mounting member 31, and the flap 33 is located above the closing stopper 41 at the closing position. By being supported by the mounting member 31 at the height and abutting against the closing-side stopper 41 from above, the flap 33 can be formed large in the exhaust pipe 9 while avoiding interference with the mounting member 31. Therefore, the backflow in the exhaust pipe 9 can be effectively prevented. In addition, the closing stopper 41 can also be formed with a simple configuration on the upper end of the mounting member 31 and does not project back and forth or left and right from the mounting member 31, so that the closing stopper 41 can be easily assembled without disturbing.

特にここでは、取付部材３１は、排気筒９の内周面９ａから離間する離間部分（直線部３５）を有し、直線部３５に閉側ストッパ４１が設けられると共に、内周面９ａ側へ折曲されて平面視で直線部３５と内周面９ａとの隙間を埋める張り出し部４４が形成されているので、直線部３５でフラップ３３を下方から安定して支持できると共に、直線部３５を設けても直線部３５と内周面９ａとの隙間をなくすことができ、外気の逆流をより効果的に阻止可能となる。
また、閉側ストッパ４１は、取付部材３１の上端から上方へ突出する凸形状となっているので、フラップ３３との接触面積が小さくて済む。よって、燃焼排気に含まれる水分がフラップ３３と閉側ストッパ４１との間で結露・凍結してフラップ３３が閉塞位置で固着するおそれが低減される。
さらに、閉側ストッパ４１の凸形状は、曲線状に形成されることで、フラップ３３との接触面積がより小さくなると共に、取付作業の際に作業者の手等が引っ掛かったりするおそれがなくなる。 In particular, here, the attachment member 31 has a separated portion (straight portion 35) that is separated from the inner peripheral surface 9 a of the exhaust pipe 9. Since the overhanging portion 44 is formed so as to be bent and fill the gap between the linear portion 35 and the inner peripheral surface 9a in a plan view, the flap 33 can be stably supported from below by the linear portion 35 and the linear portion 35 can be supported. Even if it is provided, the gap between the straight portion 35 and the inner peripheral surface 9a can be eliminated, and the backflow of the outside air can be more effectively prevented.
Further, since the closing-side stopper 41 has a convex shape projecting upward from the upper end of the mounting member 31, the contact area with the flap 33 can be small. Therefore, the possibility that moisture contained in the combustion exhaust is condensed and frozen between the flap 33 and the closing-side stopper 41 and the flap 33 is fixed at the closed position is reduced.
Furthermore, since the convex shape of the closing side stopper 41 is formed in a curved shape, the contact area with the flap 33 is further reduced, and the hand or the like of the worker is not likely to be caught during the mounting operation.

なお、閉側ストッパの形状は上記形態に限らず、前後幅の小さい三角形状や台形状（何れも角はＲとするのが望ましい）、半円形状等の他の形状も採用できる。閉側ストッパを左右一対でなく左右に複数ずつ設けてもよい。
フラップの支持形態も、１本の支持軸でなく左右に分割された２本の支持軸で支持させてもよいし、支持軸を用いずに取付部材とフラップとの一方に凸部を、他方に凹部を設けて凹凸同士の嵌合によってフラップを回転可能に支持させても差し支えない。
取付部材の形状も、直線部の端部同士を円弧状部で繋いでリング状に形成したり、直線部をなくしてストッパの形成部分のみを内側（排気筒中心側）へ折曲形成したり等、適宜変更可能である。 The shape of the closing-side stopper is not limited to the above-described embodiment, and other shapes such as a triangular shape having a small front-rear width, a trapezoidal shape (desirably, the angle is preferably R), and a semicircular shape can be adopted. A plurality of closing stoppers may be provided on the left and right instead of a pair on the left and right.
The support form of the flap may also be supported by two support shafts divided into right and left instead of one support shaft, or a protrusion may be provided on one of the mounting member and the flap without using the support shaft, and on the other. It is possible to provide a concave portion on the flap to rotatably support the flap by fitting the concave and convex portions.
The shape of the attachment member may be formed in a ring shape by connecting the ends of the straight portions with arc-shaped portions, or may be formed by bending the inward portion (exhaust cylinder center side) only by forming the stopper without the straight portion. And the like can be appropriately changed.

その他、給湯器自体も上記形態に限らず、循環式でない給湯器や、副熱交換器を備えた潜熱回収型、給湯側と風呂側或いは暖房側との加熱回路を有する複合型等であっても、屋内設置式であれば本発明の逆風止め機構は採用可能である。   In addition, the water heater itself is not limited to the above-described embodiment, and may be a non-circulating water heater, a latent heat recovery type having a sub heat exchanger, a composite type having a heating circuit for a hot water supply side and a bath side or a heating side, and the like. However, if it is an indoor installation type, the reverse wind prevention mechanism of the present invention can be adopted.

１・・給湯器、２・・筐体、３・・箱本体、４・・フロントカバー、５・・燃焼装置、６・・バーナユニット、７・・熱交換器、８・・排気フード、９・・排気筒、９ａ・・内周面、３０・・逆風止め機構、３１・・取付部材、３２・・支持軸、３３・・フラップ、３４・・円弧状部、３５・・直線部、３７・・開側ストッパ、４１・・閉側ストッパ、４４・・張り出し部、４５・・前側部、４６・・後側部、４８・・前翼部、４９・・後翼部。   1. hot water heater, 2. housing, 3. box main body, 4. front cover, 5. combustion device, 6. burner unit, 7. heat exchanger, 8. exhaust hood, 9 ..Exhaust cylinder, 9a..inner peripheral surface, 30..back wind prevention mechanism, 31..attachment member, 32..support shaft, 33..flap, 34..arc portion, 35..linear portion, 37 ··· Open side stopper, 41 ··· Closed side stopper, 44 ··· Overhang, 45 ··· Front side, 46 ··· Rear side, 48 ··· Front wing, 49 ··· Rear wing.

Claims (4)

バーナ及び熱交換器を収容する筐体と、
前記筐体から上向きに突設され、前記熱交換器を通過したバーナの燃焼排気を屋外に排出する排気筒と、
前記排気筒内に設けられ、前記筐体側への気体の逆流を防止する逆風止め機構と、を有し、
前記逆風止め機構は、前記排気筒の内周面に取り付けられた取付部材と、その取付部材に回転可能に支持されて前記排気筒内の排気流路を開閉可能なフラップとを含み、前記フラップは、前記排気流路を閉塞する閉塞位置から燃焼排気の排出側への回転が許容される一方、前記取付部材に設けたストッパにより、前記閉塞位置から気体の逆流側への回転が規制される給湯器であって、
前記ストッパは、前記取付部材の上端に設けられ、前記フラップは、前記閉塞位置で前記ストッパよりも上方となる高さで前記取付部材に支持されて前記ストッパに上方から当接することを特徴とする給湯器。 A housing containing a burner and a heat exchanger;
An exhaust pipe projecting upward from the housing and discharging the combustion exhaust of the burner that has passed through the heat exchanger to the outside,
A reverse wind stop mechanism provided in the exhaust cylinder to prevent reverse flow of gas to the housing side,
The reverse wind stop mechanism includes a mounting member attached to an inner peripheral surface of the exhaust pipe, and a flap rotatably supported by the mounting member and capable of opening and closing an exhaust flow path in the exhaust pipe. Is allowed to rotate from the closed position where the exhaust flow path is closed to the discharge side of the combustion exhaust gas, while the stopper provided on the mounting member restricts the rotation of the gas from the closed position to the reverse flow side. Water heater,
The stopper is provided at an upper end of the mounting member, and the flap is supported by the mounting member at a height that is higher than the stopper at the closed position and contacts the stopper from above. Water heater. 前記取付部材は、前記排気筒の内周面から離間する離間部分を有し、前記離間部分に前記ストッパが設けられると共に、前記内周面側へ折曲されて平面視で前記離間部分と前記内周面との隙間を埋める張り出し部が形成されていることを特徴とする請求項１に記載の給湯器。   The mounting member has a separated portion that is separated from the inner peripheral surface of the exhaust cylinder, and the stopper is provided at the separated portion, and the bent portion is bent toward the inner peripheral surface side and the separated portion and the separated portion in plan view. The water heater according to claim 1, wherein an overhang portion is formed to fill a gap with the inner peripheral surface. 前記ストッパは、前記取付部材の上端から上方へ突出する凸形状であることを特徴とする請求項１又は２に記載の給湯器。   The water heater according to claim 1, wherein the stopper has a convex shape protruding upward from an upper end of the mounting member. 前記凸形状は、曲線状に形成されることを特徴とする請求項３に記載の給湯器。   The water heater according to claim 3, wherein the convex shape is formed in a curved shape.
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JP2015222101A (en) * 2014-05-22 2015-12-10 株式会社川本製作所 Foot valve
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Publication number Priority date Publication date Assignee Title
JPS4710944U (en) * 1971-02-26 1972-10-09
US4251024A (en) * 1978-02-23 1981-02-17 Paragon Resources, Inc. Automatic vent damper
JPS61149723A (en) * 1984-12-18 1986-07-08 エヌ・ア−ル・ジ−・システムス・インコ−ポレイテツド Flue box assembly
JPS61173021A (en) * 1985-08-05 1986-08-04 Sakae Kamata Automatic controlling device for ventilator
JPH0590143U (en) * 1991-06-28 1993-12-07 株式会社ノーリツ Exhaust stack backflow prevention device
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