共查询到20条相似文献,搜索用时 78 毫秒
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Francesca Cozzani Marco Pucci Enzo Giacomelli 《通用机械》2006,(11):29-30
气阀是往复式压缩机最关键的部件之一,气阀的性能不仅直接关系到往复压缩机的可靠性,而且对设备的功耗和效率有明显的影响。因此,高技术的气阀必然成为往复压缩机用户的首选。但是,应用于不同场合和需要不同服务功能的压缩机对气阀提出了不同要求,所以耍正确地选择气阀,基于仿真工具的先进设计就成为了必要的手段。 相似文献
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为研究压缩机阀隙气流马赫数对吸、排气过程压力脉动及压缩机噪声的影响,通过改变气阀阀隙几何通流面积的方式控制阀隙通道的气体流速和马赫数,采集不同阀隙马赫数下的吸、排气腔和气缸压缩腔内压力波动信号以及缸头侧噪声声压信号,分别对阀片开启时的阀隙压力脉动强度以及压缩机噪声时频信号进行分析。试验发现吸气过程阀隙压力脉动仅发生在阀片开启瞬间,且瞬时压力脉动强度远远大于排气过程;阀隙吸气马赫数对500~2500 Hz范围内的压缩机噪声均有一定影响,排气马赫数主要对2000 Hz的压缩机噪声有一定影响,吸排气阀隙马赫数的改变对试验压缩机噪声影响最大相差2.03 dB(A)。降低阀隙马赫数对改善压缩机吸排气过程压力脉动及压缩机噪声具有重要意义。 相似文献
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往复压缩机气阀弹簧的优化设计 总被引:2,自引:0,他引:2
以环状阀中广泛应用的圆柱形压簧为例,在同时考虑其体积、重量和高度的基础上建立气阀弹簧的优化设计模型,并利用有限元软件ANSYS7.0进行了实例优化求解。 相似文献
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提出了一种往复压缩机气阀的故障诊断方法.把往复压缩机气阀的振动信号作为识别故障的特征向量,送入RBF神经网络中,进行故障类别的自动识别.试验结果表明,该诊断模型对往复压缩机气阀故障诊断具有良好的诊断效果,系统不仅能够检测到往复压缩机气阀故障的存在,而且能够比较准确地识别往复压缩机气阀的故障模式. 相似文献
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喷油与无油螺杆压缩机的性能分析 总被引:1,自引:0,他引:1
螺杆压缩机具有结构简单、工作可靠和操作方便等一系列优点被广泛应用与空气动力、制冷空调及各种工艺流程中。本文简要介绍喷油螺杆压缩机与无油螺杆压缩机的技术性能,对两种压缩机优缺点进行了比较。同时也介绍了两种压缩机产生噪声原因及控制方法。 相似文献
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Huiming Zou Liqin Zhang Guohong Peng Changqing Tian 《Journal of Mechanical Science and Technology》2011,25(8):1885-1892
The dual-cylinder opposed linear compressor (DOLC) contains a couple of symmetrical gas loads on the two sides of the movement
components. Because the gas loads are symmetrical, the balanced position of movement components will not be offset by gas
force during the operating process, and piston displacement can be detected and controlled more easily. Based on the kinetics
and thermodynamics theory, the non-linear gas load of the DOLC was linearized by the Fourier method. The relationship between
the supply voltage and displacement is presented. Through air compression experiments, the operation features of the DOLC
with different syntonic spring groups were analyzed. The performance of the DOLC was considerably affected by work conditions
and the stiffness of syntonic spring groups; the closer the work condition was to the sympathetic vibration, the higher the
observed efficiency of the DOLC. A jump, hysteresis, and an unstable phenomenon in the process of voltage regulation occurred
around sympathetic vibration conditions. In the process of increasing voltage on a certain discharge pressure condition, the
displacement jump phenomenon occurred when the intrinsic frequency approacheds power frequency, causing the discharge pressure
to drop synchronously. In the process of decreasing voltage on the lower discharge pressure condition, the displacement shrink
phenomenon occurred when the intrinsic frequency approached power frequency. Because sympathetic vibration conditions changed
with discharge pressures, a hysteresis district existed between the displacement jump point and shrink point. The DOLC worked
unstably on the hysteresis district because the discharge pressure fluctuated between the two values. To make the DOLC work
stably on higher efficiency, the intrinsic frequency should be configured to a slightly larger value than the power frequency
by setting the syntonic spring groups and the mass of movement components to the ratings on the work conditions. Controlling
the power frequency after is needed to adhere to the intrinsic frequency of the variable work conditions. 相似文献
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