在气焊工作中,缺少不了回火防止器。目前建筑工地上常用的浮沉式乙炔发生器上的回火防止器以水式的为多,这在南方或室内使用可以,但在北方的冬天或室外工作,则会冻结而不能使用。为此根据北方地区的特征,设计了一种干式防冻的回火防止器,经多年使用效果很好,且 In the gas welding, the lack of tempering preventer. At present, buoyant acetylene generators commonly used on construction sites have a large number of tempering preventers that can be used in the south or indoors. However, they work in winter or outdoors in the north, and can freeze and can not be used. To this end according to the characteristics of the northern region, designed a dry antifreeze tempering preventer, after years of good results, and