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以往,作为凿岩机的排气装置,是在缸体上开一个排气口,同时在缸体外侧设置一个与该排气口相连通的外罩,外罩内为一个膨胀室。使冲击活塞动作的压气经缸体的排气口进入膨胀室,通过排气膨胀作用,使排气脉动压下降来降低噪声。为进一步减小噪声,日本曾在1974年第89602号(公开)专利中发表了对上述装置的改进方法,即在膨胀室中,与排气口相对地设置一个具有密封气体的弹性袋状物,使排气脉动压通过袋状物的弹性变形来减弱。但是,此种方法还存在着缺点,即排气脉动压只集中在袋状物的中心部,不能均匀地施加在袋
Conventionally, as an exhaust device of a rock drill, an exhaust port was formed in a cylinder block, and a housing communicating with the exhaust port was provided outside the cylinder block, and an expansion chamber was provided in the housing. The impact of the piston action of the gas through the exhaust port of the cylinder into the expansion chamber, through the exhaust expansion, the exhaust pressure drop to reduce noise. In order to further reduce the noise, Japanese Patent Disclosure No. 89602 (published) 1974 discloses an improvement on the above apparatus in that an elastic bag with a sealing gas is provided in the expansion chamber opposite to the exhaust port , The exhaust pulse pressure is reduced by the elastic deformation of the bag. However, this method has the disadvantage that the exhaust pulsation pressure is concentrated only on the central portion of the pouch and can not be uniformly applied to the pouch