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阀配流式径向柱塞泵相比其他类型柱塞泵具有结构简单,工作稳定可靠的特点,然而由于进出口阀的存在,阀口处液体流动受阻,主要工作单元柱塞缸存在自吸性能差的问题,当在特殊应用场合需要大流量化设计时,吸油性能恶化,导致吸油不完全而容积效率骤降。这里以径向柱塞泵中柱塞缸为研究对象,在大流量设计的需求下,综合径向柱塞泵考虑单作用与多作用情形,通过AMEsim对大流量柱塞缸许用转速与作用次数进行仿真实例研究,总结出针对大流量柱塞缸的最大许用转速与作用次数选值方法。该结论为后续阀配流式大流量径向柱塞泵的设计提供设计思路。 相似文献
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进行了平衡式柱塞泵的理论分析,针对柱塞泵的运动情况,阐述了为实现柱塞泵的无流量脉动的柱塞的运动速度曲线所必须具备的特征,导出了几种常见的无流量脉动特征速度曲线,并设计了平衡式径向柱塞泵。 相似文献
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某型径向柱塞泵配流轴的结构设计研究 总被引:2,自引:0,他引:2
针对径向柱塞泵的偏磨和"抱轴"问题,设计了一种平衡结构,并进行了相应的分析.该结构设计简单、加工方便,使用可靠,可广泛应用于大中型轴配流径向柱塞泵中. 相似文献
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机械振动与流体振动是径向柱塞泵中两种常见的振动类型。配流轴及变量机构的振动、由转子偏心与不平衡所产生的振动都为机械振动;由径向柱塞泵的压力冲击和固有流量脉动所引起的振动则为流体振动。对各激振源及其激振频率进行了详细介绍,并分析了其对径向柱塞泵的性能影响。 相似文献
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径向变量柱塞泵比轴向柱塞泵耐冲击、寿命长、控制精度高,是一种高技术含量的高压泵。但径向变量柱塞泵的制造和维修都很困难。作者通过仔细分析,找出某径向变量柱塞泵失效的原因并采取措施对之进行了修复。该修复方案被证明是合理有效的,对今后修复类似柱塞泵有很好的借鉴意义。 相似文献
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本文提出了新型的恒流柱塞泵的理论分析和设计,针对柱塞泵的运动情况,阐述了为实现柱塞泵的无流量脉动的柱塞的运动速度曲线所必须具备的特征,导出了几种常见的恒流特征速度曲线,并设计了径向恒流柱塞泵。 相似文献
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The limit working parameters and service life of axial piston pump are determined by the carrying ability and lubrication characteristic of its key friction pairs. Therefore, the design and optimization of the key friction pairs are always a key and difficult problem in the research on axial piston pump. In the traditional research on piston/cylinder pair, the assembly relationship of piston and cylinder bore is simplified into ideal cylindrical pair, which can not be used to analyze the influences of radial micro-motion of piston on the distribution characteristics of oil-film thickness and pressure in details. In this paper, based on the lubrication theory of the oil film, a numerical simulation model is built, taking the influences of roughness, elastic deformation of piston and pressure-viscosity effect into consideration. With the simulation model, the dynamic characteristics of the radial micro-motion and pressure distribution are analyzed, and the relationships between radial micro-motion and carrying ability, lubrication condition, and abrasion are discussed. Furthermore, a model pump for pressure distribution measurement of oil film between piston and cylinder bore is designed. The comparison of simulation and experimental results of pressure distribution shows that the simulation model has high accuracy. The experiment and simulation results demonstrate that the pressure distribution has peak values that are much higher than the boundary pressure in the piston chamber due to the radial micro-motion, and the abrasion of piston takes place mainly on the hand close to piston ball. In addition, improvement of manufacturing roundness and straightness of piston and cylinder bore is helpful to improve the carrying ability of piston/cylinder pair. The proposed research provides references for designing piston/cylinder pair, and helps to prolong the service life of axial piston pump. 相似文献
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为减轻往复泵的水头损失及空化现象,以提高吸入性能,根据魏斯特法尔理论分析了泵阀运动特性,基于阀盘结构和活塞冲次等参量,提出了水头损失和空化量的优化模型。采用Fluent动网格技术进行动态数值模拟,分析了各参量对吸入过程水头损失和空化现象的影响及其发展过程,优选出了最佳阀盘结构参数和活塞冲次,可有效减小液缸内的水头损失,降低因阀盘开启滞后而产生的空化现象,改善泵的吸入性能和汽蚀现象。得出了往复泵吸入过程水头损失最小、活塞端面的空化量最小时的阀盘锥角及最优的工作冲次,为往复泵的吸入特性研究提供了参考依据。 相似文献
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In this paper, a dynamic analysis of the reciprocating compression mechanism of a small refrigeration compressor is performed.
In the problem formulation of the mechanism dynamics, the viscous frictional force between the piston and the cylinder wall
is considered in order to determine the coupled dynamic behaviors of the piston and the crankshaft. Simultaneous solutions
are obtained for the equations of motion of the reciprocating mechanism and the time-dependent Reynolds equations for the
lubricating film between the piston and the cylinder wall and for the oil films on the journal bearings. The hydrodynamic
forces of the journal bearings are calculated by using a finite bearing model along with the Gümbel boundary condition. A
Newton-Raphson procedure is employed in solving the nonlinear equations for the piston and crankshaft. The developed computer
program can be used to calculate the complete trajectories of the piston and the crankshaft as functions of the crank angle
under compressor-running conditions. The results explored the effects of the radial clearance of the piston, oil viscosity,
and mass and mass moment of inertia of the piston and connecting rod on the stability of the compression mechanism. 相似文献
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Shungen Xiao Hongli Zhang Shulin Liu Feng Jiang Mengmeng Song 《Journal of Mechanical Science and Technology》2018,32(9):4103-4124
Subsidence wear is inevitable in a reciprocating compressor system, but how to induce body vibration is not clear. We investigated the dynamic behavior of a reciprocating compressor system with subsidence fault considering a flexible piston rod. The flexible piston rod was modeled as a cantilever beam. The dynamic model, in which the influence of the subsidence size, variational cylinder pressure, impact effects and piston rod flexibility are taken into account, was established. Influences of the four parameters including subsidence size, vertical force of flexible piston rod, cylinder pressure and crankshaft speed were analyzed in the dynamic response. Numerical results reveal that with the change of the four parameters, the existence of subsidence fault has a significant effect on the displacement, velocity and acceleration of the crosshead in the transverse direction, but only conspicuously affects the acceleration in the longitudinal direction. In addition to cylinder pressure, the larger the values of the other three parameters, the greater the influences. The cylinder pressure is a time-varying working load. Not only the cylinder pressure but also the open/close time of the valves and change rate of the pressure all affect the dynamic behavior of the system with subsidence. Meanwhile, the change in the vertical force of the flexible piston rod has a remarkable effect on the jump position of the crosshead, but the effect of other parameters is not obvious. In addition, the changes of parameters produce obvious influences on the impact force and the impact range of the crosshead. The stability of the reciprocating compressor system was studied using Poincaré portraits method. The result shows that the system with subsidence fault has chaotic behavior. 相似文献
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The tribological system in the piston assembly of an internal combustion engine includes contacts at interfaces of piston/piston ring/cylinder liner, piston skirt/cylinder wall, and piston/piston pin/ connecting rod. The thermal and tribological properties of the piston, piston rings, and cylinder wall are critical to the life and quality of the engine. Severe wear and scuffing failure, especially at the ring/ring groove and ring/liner interfaces, may present a major problem if the piston temperature is too high. Temperature considerations for the piston often limit the effort to increase the engine power. A new engine piston incorporating the heat pipe cooling technology has been developed for reducing the piston temperature, especially in the ring land and along the piston wall. The current work aims at investigating the effect of reciprocating heat pipes on heat conduction in the piston, and thus the tribological behavior of the piston assembly. Due to the high thermal conductance of the reciprocating heat pipe, a considerably large amount of combustion heat, which is conventionally conducted through the piston wall, is transferred through heat pipes. This new design will result in a lower temperature on the piston wall and a reasonably low temperature distribution in the piston. 相似文献
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为进一步满足低压、低产气井的排水采气作业需求,降低运行成本,完善排水采气工艺,提出一种适用于直井、斜井、水平井,仅依靠储层中的天然气作为动力来源的新型井下排水采气泵。该泵基于气动增压原理,利用多级气缸增压并以机械闭环的控制方式驱动往复泵机构工作,从而将井筒内的积液泵送至地面。介绍新型排水采气泵的结构和工作原理,阐述工作流程并具体分析驱动气缸的控制方式与运动换向逻辑;建立排水采气泵的数学模型;最后,利用MATLAB/Simulink进行动态特性仿真,研究包括驱动气缸活塞直径、驱动气缸活塞行程、控制阀开关行程和换向阀阀芯直径在内的结构参数对系统动态特性的影响以及在不同载荷、驱动压力与增压比下的工作特性。通过仿真计算,确定了排水采气泵的结构参数,同时为实际运用中的选型提供了参考。 相似文献