目前，烟道式燃气热水器通常安装在室内，其燃烧产生的烟气通过其排烟罩的排烟管接口连接的排烟管排出到室外。现有的烟道式燃气热水器的排烟罩主要由排烟罩壳体10和固定设于排烟罩壳体10内的U形挡风板20构成。U形挡风板20设于排烟罩壳体10的中心，其开口正对排烟罩壳体10顶部的排烟管接口 11，烟道式燃气热水器燃烧产生的烟气从排烟罩壳体10底部的烟气入口 12进入，排烟罩壳体10的两侧还设有由排烟罩壳体10内侧向其外侧倾斜向下的空气通道13。
At present, the flue gas water heater is usually installed in the indoor area, and the smoke generated by the combustion is discharged to the outdoors through the exhaust pipe connected with the exhaust pipe interface of the exhaust hood. The existing smoke exhaust hood of the flue gas water heater is mainly composed of a smoke exhausting cover shell 10 and a U shaped windshield plate fixed in the 10 of the hood housing shell. U shaped windshield plate 20 is arranged at the hood shell 10 center, the opening is at the top of the hood shell 10 exhaust pipe interface 11, combustion flue gas flue type gas water heater from the smoke hood casing 10 at the bottom of the flue gas entrance 12 into the housing 10, both sides of the hood is provided with a smoke hood casing 10 medial to the the lateral tilt air passage down 13.
由于现有排烟罩的结构尺寸没有针对防风(倒灌风)设计，导致在外界风压较大时，外界的风易从排烟管倒灌进入到排烟罩中，倒灌的风一部分从排烟罩两侧的空气通道13排出，剩下部分的倒灌风直接从烟气入口 12倒吹向烟道式燃气热水器的燃烧器，导致正常燃烧的火排出现火焰外溢或熄火现象；同时，会使得烟道式热水器的排烟困难，产生的CO (—氧化碳)量增加并从空气通道排出到室内，造成使用者中毒。因此，现有的烟道式燃气热水器在外界风压较大时无法正常使用，并且不。
Due to the structure size of existing hood for wind (downdraft) design, resulting in the wind pressure is large, the outside wind easily from the exhaust pipe to the intrusion into the smoke hood, a part of the wind from the intrusion of exhaust hood air channel 13 on both sides of the discharge, the remaining part of the downdraught flue gas blowing down directly from the entrance 12 to the flue gas water heater burner, leading to the normal fire exhaust flame spillover or extinction phenomenon; at the same time, the smoke difficult flue gas water heater, the CO (carbon monoxide) increased and discharged from the air passage to the interior, caused by poisoning. Therefore, the existing flue gas water heater can not be used normally when the outside wind pressure is large, and it is not safe
烟道式燃气热水器的排烟罩，排烟管接口的直径为120±0.3mm，空气通道的顶盖板与水平面的夹角为36±1°，空气通道的底侧导流板与水平面的夹角为30±1°，烟气入口的宽度为124±0.5mm，U形挡风板的开口与烟气入口的高度差为77±1mm，U形挡风板的弧形段的直径为65.3±1.5mm，U形挡风板的平直段的高度为10±0.5mm。本发明还公开了一种包括上述排烟罩的烟道式燃气热水器。
Exhaust flue type gas water heater cover, exhaust pipe interface diameter was 120 + 0.3mm, the angle between the top cover and the horizontal air channel is 36 + 1 degree angle, bottom side guide plate and the horizontal air channel is 30 + 1 DEG, flue gas entrance width is 124 + 0.5mm, U shape deflector the opening and the flue gas entrance height difference is 77 + 1mm, the arc section of U shape of the windscreen diameter was 65.3 + 1.5mm, straight section of U shape of the windscreen height was 10 + 0.5mm. The invention also discloses a flue gas water heater including the smoke exhaust hood.
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