公开(公告)号：US4079809A

公开(公告)日：1978-03-21

申请号：US815127

申请日：1977-07-13

申请人： Aarne Visnapuu ,  Scott Emory Lay

发明人： Aarne Visnapuu ,  Scott Emory Lay

IPC分类号： B25D17/12 ,  F01N1/08 ,  F01N1/20

CPC分类号： E21B7/025

摘要： A muffler for a percussive drill is provided consisting of a casing of general prismatic shape adapted for mounting on the drill. An inlet is present in the casing for receiving exhaust from the drill, the drill exhaust port and muffler inlet having the same cross-sectional area. Resilient rectangular baffles are mounted within the casing and are rigidly fastened at two opposite edges to the casing wall. The two other edges, which are longer than the fastened edges, are in contact with casing walls. Staggered holes are present in the baffles, so the gas flow through the muffler follows a sinusoidal path. The sides of the casing tapers down after the last baffle to a fraction of its height and then extend for a given length at the lessened height to form a narrow rectangular exhaust port. One face of the casing adjacent the exhaust port consists of resilient sheet material. The flow of gas through the muffler causes strong vibration of the baffles and resilient face near the exhaust port. As a result, ice which may be formed within the muffler, cannot accumulate on the surfaces and any ice formed is expelled through the exhaust port.

摘要翻译： 提供了一种用于冲击钻的消音器，其由适于安装在钻头上的一般棱柱形状的壳体组成。 入口存在于壳体中用于接收来自钻头的排气，钻头排气口和消音器入口具有相同的横截面积。 弹性矩形挡板安装在外壳内，并且在两个相对的边缘处牢固地固定在外壳壁上。 比紧固边缘长的两个边缘与壳体壁接触。 挡板上存在交错孔，因此通过消音器的气体流过正弦曲线。 套管的侧面在最后一个挡板之后逐渐下降到其高度的一小部分，然后在减小的高度处延伸给定的长度以形成窄的矩形排气口。 靠近排气口的壳体的一个面由弹性片材组成。 通过消声器的气体流引起排气口附近的挡板和弹性面的强烈振动。 结果，可能形成在消声器内的冰不能积聚在表面上，并且形成的任何冰被排出通过排气口。