共查询到20条相似文献,搜索用时 125 毫秒
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使用涡旋型线始端展角和终端展角几何参数,对驱动轴承内嵌式双涡旋齿涡旋压缩机的吸气容积、排气容积、压缩比建立了计算公式;对作用于双涡旋齿动涡盘的气体力建立了分析模型;并通过计算与传统的双涡旋齿气体力进行了比较。结果表明,驱动轴承内嵌式双涡旋齿涡旋压缩机相对于传统的双涡旋齿涡旋压缩机,切向、轴向和径向气体力均减小,输气量更大,运行更平稳。 相似文献
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针对涡旋型线齿头修正最优参数难以确定的问题,综合考虑齿头修正对基元腔气体力与齿头强度的影响,推导双圆弧加直线修正方法几何模型,建立双圆弧加直线修正方法参数化模型,解析涡旋齿头修正后压缩机气体力、齿头修正面积计算公式,研究了各修正参数对气体力与涡旋齿头修正面积的影响规律。以气体力峰峰值、涡旋齿修正面积为优化目标,齿头修正参数为设计变量,基于多目标遗传优化算法对修正参数进行优化设计。涡旋齿头面积基本不变的情况下,径向、切向气体力峰峰值下降最大达到22.61%,研究结果可为修正涡旋齿气体力解析计算、齿头修正最优参数选取提供理论依据。 相似文献
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得到了双涡旋齿涡旋压缩机在工作腔的形成、工作腔之间的相对位置关系、腔内气体的径向泄漏和传热、涡旋盘所受气体力、背压孔和排气孔口气速等方面的性能特点,比较了与单涡旋齿涡旋压缩机在以上方面的不同。结果表明:双涡旋齿结构具有涡旋盘所受气体力波动小、排气脉动小、工作腔内气体的径向泄漏严重和热交换复杂等特点。 相似文献
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在workbench平台下提出一种涡旋压缩机流场气体力对涡旋齿边界受力变形影响的瞬态流固耦合计算方法,建立了涡旋压缩机三维流场模型,采用RNG k-ε湍流模型对其工作过程进行模拟从而得到流场分布,流场压力分布沿齿高方向不均匀,曲轴转角90°时涡旋齿内外侧压差在齿头处最大。将流场边界压力载荷加载到涡旋齿边界上,得到任意曲轴转角下的涡旋齿的受力和变形分布,分析了流场变化对涡旋齿受力、变形的影响。得到了涡旋齿的受力和变形规律,此压力载荷施加方法与实际工作状态更接近,计算结果更贴近实际情况。 相似文献
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In this study, a numerical analysis for the piston secondary dynamics of small refrigeration reciprocating compressors is performed. In general, the length of cylinder in this class of compressors is shortened to diminish the frictional losses of the piston-cylinder system. So, the contacting length between piston and cylinder wall is in variable with the rotating crank angle around the BDC of the reciprocating piston. In the problem formulation of the piston dynamics, the variation in bearing length of the piston and all corresponding forces and moments are considered in order to determine the piston trajectory, velocity and acceleration at each step. A Newton-Raphson procedure was employed in solving the secondary dynamic equations of the piston. The developed computer program can be used to calculate the entire piston trajectory and the lubrication characteristics as functions of crank angle under compressor running conditions. The results explored the effects of some design parameters and operating conditions on the stability of the piston, the oil leakage, and friction losses. 相似文献
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提出了一种变等效转动惯量飞轮的设计方法。将微型飞轮安装在与往复压缩机曲轴保持变速比的固定轴上。通过非圆齿轮传动实现轴与曲轴之间的变速比传动,这不仅能完全消除曲轴的速度波动.而且能平衡输入扭矩的波动,减少飞轮自身的重量和转动惯量。 相似文献
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提出一种变等效转动惯量飞轮的设计方法。将微型飞轮安装在与往复式压缩机曲轴保持变速比的固定轴上,通过非圆齿轮传动实现轴与曲轴之间的变速比传动,不仅能完全消除曲轴的速度波动,而且能平衡输入扭矩的波动,减少飞轮自身质量和转动惯量。 相似文献
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鉴于无油螺杆压缩机在石油、化工与气体行业得到大量应用,介绍了压缩机的壳体、转子、轴封、轴承等关键部件的主要特征,并给出了压缩机机型、转子间隙、内容积比、转速等重要参数的选型原则。 相似文献
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基于多体动力学理论,建立了往复泵曲柄连杆机构参数化动力学模型.通过算例仿真,对往复泵曲柄连杆机构运动及受力特性进行了研究,获得了连杆随曲轴转角变化的运动规律,以及连杆两端的铰链反力变化规律. 相似文献
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Jeong-Geun Park Weui-Bong Jeong Young-Soo Seo Wan-Suk Yoo 《Journal of Mechanical Science and Technology》2007,21(2):272-281
The forces from the engine firings and the rotational motion of a crankshaft cause excitations in vehicle engines. In conventional
in-line engines, crank angles might be evenly assigned by dividing 360 degrees by the number of cylinders. In this paper,
allocation of crank angles was carried out in two different ways, (1) to minimize the moments excited in an engine and (2)
to minimize the forces transmitted to the engine mounts. The forces and moments due to gas pressure and reciprocating parts
in the engine were formulated, and a computer program to predict the excitation forces and moments was developed. The developed
program was applied to a four-stroke seven-cylinder engine to reduce the first- and the second- order moments produced by
the engine. Then, it was also applied to minimize the forces transmitted to the engine mounts. The optimized crank angles,
in contrast to those of conventional engines, were not evenly distributed. The moments and forces were reduced with the optimized
crank angles. 相似文献
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