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推土机的排气消声器一般用噪声衰减和引擎功率损失来评定。常见的排气消声器均有一个相当复杂几何形状的结构,制造困难,成本高。同时消声器用玻璃纤维作为消声材料,时间长了纤维容易堵塞、退化、消声效果随之下降。本专利介绍的圆筒形排气消声装置避免了上述缺点。该装置由薄板制成,结构简单,不需使用玻璃纤维或类似材料。与其它消声器比较,该装置在流体动力学(指引擎功率损失)和声学(音响效果)两个方面均具备很好的性能,保证达到规定的排气消声标准,其噪声值最高不超过74dB(A)声级。(在可听声频,距引擎5～7米,离地面1～2米范围内)。
Exhaust mufflers for bulldozers are generally rated by noise attenuation and engine power loss. Common exhaust mufflers have a rather complex geometry and are difficult to manufacture and costly. At the same time, the muffler is made of glass fiber as an anechoic material, and for a long time, the fiber easily clogs, degrades, and the noise reduction effect decreases. The cylindrical exhaust muffler device described in this patent avoids the above disadvantages. The device is made of sheet metal and has a simple structure that does not require the use of glass fibers or similar materials. Compared with other mufflers, the device has good performance in both fluid dynamics (refers to engine power loss) and acoustics (sound effects), ensuring that the specified exhaust muffler standard is achieved, and the maximum noise value does not exceed 74 dB. (A) Sound level. (In audible audio, 5 to 7 meters from the engine, within 1 to 2 meters from the ground).