Anti-downdraft structure of gas water heater exhaust fume collecting hood top cylinder

The invention relates to an anti-downdraft structure of a gas water heater exhaust fume collecting hood top cylinder. The anti-downdraft structure of the gas water heater exhaust fume collecting hoodtop cylinder comprises a top cylinder and a baffle plate matched with an inner channel of the top cylinder. The baffle plate is fixed to the inner portion of the top cylinder by a pin shaft arranged on the baffle plate in a penetrating mode. The baffle plate can rotate around the pin shaft which is used as a rotating shaft to open or close the inner channel of the top cylinder. Two ends of the pinshaft are arranged inside the top cylinder and are correspondingly hinged to two sides of the top cylinder. According to the anti-downdraft structure of a gas water heater exhaust fume collecting hood top cylinder, a staff is avoided from being scratched during the installation, and at the same time, the appearance is more attractive. 本发明涉及种燃气热水器集烟罩顶筒的防倒风结构，包括顶筒和与顶筒内部通道相匹配的档板，档板经贯穿设置于档板上的销轴固定于顶筒内部，档板能以销轴为旋转轴旋转，令顶筒内部通道打开或关