The invention relates to the field of exhaust silencers, in particular to a magnetorheological exhaust muffler which automatically adjusts the cavity. The cylinder body consists of a hollow cylindrical tube and an inlet pipe and an air outlet at both ends of the axis of the cylinder. The cylinder is separated into the first cavity, the second cavity and the third cavity along the axis direction of the vertical cylinder by the left partition and the right partition. The intake pipe interconnects with the first cavity, the outlet pipe interconnects with the third cavity; the left piston and the right septum are used. There is a left circulation hole and a right circulation hole on the board; the left piston is fixed with a piston rod coaxial with the cylinder, and a piezoelectric vibrator is arranged on the fine shaft of the piston rod that reaches the first cavity, and the piezoelectric vibrator is bonded by a circular circular piezoelectric ceramic and a metal substrate; the second cavity is equipped with a cylindrical coaxial cylinder with a cylindrical shape. The cylinder block and cylinder cavity of the inner cavity are filled with magnetorheological fluid. Advantages and characteristics: 1) using piezoelectric vibrator to transform the sound energy into mechanical energy, sound absorption capacity, high reliability; 2) to automatically adjust the chamber volume and the right piston damping force according to the engine speed change to achieve dynamic active sound absorption, the structure is simple; 3) absorption of low frequency sound wave through piezoelectric ceramics, using perforated plate and glass. The interaction between cotton and cotton absorbs medium and high frequency sound waves, and the absorption band is wide.
【技术实现步骤摘要】
一种自动调节腔体的磁流变排气消音器
本专利技术涉及排气消音设备领域,具体涉及一种自动调节腔体的磁流变排气消音器。
技术介绍
随着工业化程度的提高,噪声危害程度日益扩大,交通噪声成为当前城市环境噪声中最主要的噪声源,而排气噪声是汽车发动机的主要噪声源,排气消声器是阻止声音传播而允许气流通过的一种器件,是消除空气动力性噪声的重要措施。排气消声器的种类很多,大多数排气消声器的消声性能依赖于固定的结构参数。现有技术中,排气消声器的排气消音效果不够理想,原因在于:发动机排气噪声随转速变化而变化,排气消声器消音频率不能随发动机转速的变化进行自动调节,故吸声系数低,吸收频带窄,且不易控制。
技术实现思路
针对现有排气消音器消音方面所存在的问题,本专利技术提出一种自动调节腔体的磁流变排气消音器,本专利技术采用的实施方案是:一种自动调节腔体的磁流变排气消音器,包括中空的圆柱形筒体,沿筒体轴线两端分别设有进气管和出气管;筒体包括壳体、玻璃棉和穿孔板,穿孔板上开有若干气孔;筒体内由左活塞和右隔板沿垂直筒体轴线方向将筒体分隔为第一腔体、第二腔体和第三腔体,进气管与第一腔体相通,出气管与第三腔体相通;左活塞和右隔板上均布地开有左流通孔和右流通孔;左活塞上固设有与筒体同轴的活塞杆,伸入到第一腔体的活塞杆的细轴上套设有压电振子,压电振子均由圆环形的压电陶瓷和金属基板粘接而成;第二腔体内设有与筒体同轴的的带有圆柱形内腔的缸体,缸体内腔中充满磁流变液,活塞杆的粗轴伸入到缸体的内腔中,活塞杆的粗轴上设有右活塞,右活塞上开有便于磁流变液流动的阻尼孔,右活塞上设有使磁流变液状态改变的线圈,活塞杆的粗 ...
【技术保护点】
1.一种自动调节腔体的磁流变排气消音器,其特征在于:包括中空的圆柱形筒体,沿筒体轴线两端分别设有进气管和出气管;筒体包括壳体、玻璃棉和穿孔板,穿孔板上开有若干气孔;筒体内由左活塞和右隔板沿垂直筒体轴线方向将筒体分隔为第一腔体、第二腔体和第三腔体,进气管与第一腔体相通,出气管与第三腔体相通;左活塞和右隔板上均布地开有左流通孔和右流通孔;左活塞上固设有与筒体同轴的活塞杆,伸入到第一腔体的活塞杆的细轴上套设有压电振子,压电振子均由圆环形的压电陶瓷和金属基板粘接而成;第二腔体内设有与筒体同轴的的带有圆柱形内腔的缸体,缸体内腔中充满磁流变液,活塞杆的粗轴伸入到缸体的内腔中,活塞杆的粗轴上设有右活塞,右活塞上开有便于磁流变液流动的阻尼孔,右活塞上设有使磁流变液状态改变的线圈,活塞杆的粗轴右端与缸体底部设有弹簧;活塞杆与端盖间设有密封与导向件;端盖通过螺钉安装在缸体左端部,缸体通过螺钉固定在右隔板上;压电振子为弯曲的彩虹型结构,压电陶瓷的曲率半径小于金属基板的曲率半径,压电陶瓷厚度为0.17~0.3mm的PZT4,金属基板为铍青铜,金属基板与压电晶片的厚度之比为1~2.6。
【技术特征摘要】
1.一种自动调节腔体的磁流变排气消音器,其特征在于:包括中空的圆柱形筒体,沿筒体轴线两端分别设有进气管和出气管;筒体包括壳体、玻璃棉和穿孔板,穿孔板上开有若干气孔;筒体内由左活塞和右隔板沿垂直筒体轴线方向将筒体分隔为第一腔体、第二腔体和第三腔体,进气管与第一腔体相通,出气管与第三腔体相通;左活塞和右隔板上均布地开有左流通孔和右流通孔;左活塞上固设有与筒体同轴的活塞杆,伸入到第一腔体的活塞杆的细轴上套设有压电振子,压电振子均由圆环形的压电陶瓷和金属基板粘接而成;第二腔体内设有与筒体同...
【专利技术属性】
技术研发人员:王鸿云,赵爽,刘卫东,毕成,朱俊华,
申请(专利权)人:浙江师范大学,
类型:发明
国别省市:浙江,33
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