气动马达以其单位体积输出功率大,使用性能安全可靠等优点而应用于冶金、石油、化工、船舶、水电等部门。但是气动马达一个最大缺点就是噪声大,就TJ型气动马达而言,噪声几乎都在115dB(A)至124dB(A)之间,除飞机的喷气噪声(140dB)外,气马达的噪声可算是魁首了。所以国外有人把气动马达类的机械列为第三类噪声机械。气动马达的噪声,主要是排气噪声,与其它一般机械噪声相比,它还具有排气量大,气流速度高等特性。对于这类噪声采取的消声措施大概可分为两种,即外接消声装置和内设消声结构两种。外接消声装置,一般来说体积较大,如加拿大一个矿山曾把每台气动凿岩机都接上了15米长,直径为 Air motor with its unit volume of output power, the use of performance, safety and reliability advantages such as applied to metallurgy, petroleum, chemical, shipbuilding, hydropower and other departments. However, one of the biggest drawbacks of air motor is the noise. For TJ type air motor, the noise is almost all between 115dB (A) and 124dB (A). The air motor noise can be considered as excluding the aircraft’s jet noise (140dB) Quebec first. So some foreign people to air motor class machinery as the third category of noise machinery. Air motor noise, mainly exhaust noise, compared with other general mechanical noise, it also has a large displacement, high air velocity characteristics. The noise reduction measures taken for this type of noise can be roughly divided into two types, that is, the external noise reduction device and the built-in noise cancellation structure. External muffler, in general, larger, such as a mine in Canada once each pneumatic drill connected to a 15-meter-long diameter