球塞泵接触应力理论分析及实验研究

发布时间：2018-06-30 01:07

本文选题：球塞泵 + 定子轨道　；参考：《南昌大学》2012年硕士论文

【摘要】：球塞泵以高精度陶瓷球为活塞,采用轴配流,其缸孔内壁喷涂有一层耐磨工程塑料,利用其弹塑性和球塞的刚性建立起密封面,大大降低泄漏流量。但由于高速往复运动,球塞表面与缸孔表面有极大摩擦,会造成材料磨损等疲劳破坏。同时,球塞副在压缩冲程中,由于偏心力的作用,球塞偏向缸孔一侧,对缸孔壁的侧向压力较大。缸孔变形严重,不利于其润滑。本课题主要从以下两个方面展开研究：一方面,建立球塞泵的运动学模型,研究整个运动过程中球塞沿定子轨道的运动轨迹,在此基础上研究球塞对定子轨道的接触应力变化规律。同时,以同心球塞副柱坐标下的特性方程为基础,根据球塞副的实际偏心情况,求解偏心球塞副接触的应力和应变分布特性,从理论上研究球塞副的接触特性。另一方面,对之前进行的球塞泵接触应力理论分析展开实验研究以验证理论分析的正确性。建立试验台,设计和加工工作压力在5MPa左右的海军黄铜质的球塞泵以及球塞副摩擦磨损和压差泄漏流量测试装置,对其进行球塞泵球塞副压差泄漏流量测试。通过理论建模和数值仿真相结合的方法来研究球塞副的接触与应力应变特性,为球塞副接触应力应变特性的实验研究提供本质特征准数；基于流体弹性力学方程建立描述球塞副的变形模型,并以测量球塞副特定工况条件下的泄漏流量来间接评判变形所形成的密封的可靠性。将上述所有研究结合起来,最终探明球塞泵的应力应变特性。
[Abstract]:The ball plug pump uses a high-precision ceramic ball as a piston. The inner wall of the cylinder is sprayed with a layer of wear-resistant engineering plastics, which uses its elastic plasticity and the rigidity of the ball plug to establish a dense cover, which greatly reduces the leakage flow. However, because of the high speed reciprocating movement, the surface of the ball plug has a great friction with the surface of the cylinder hole, and it will cause fatigue damage such as material wear and so on. In the compression stroke, the ball plug in the compression stroke, because of the effect of eccentric force, the ball slug to the side of the cylinder hole, the lateral pressure on the cylinder bore wall is larger. The cylinder hole is deformed seriously and is not conducive to its lubrication.
This subject is mainly studied in the following two aspects: on the one hand, the kinematic model of the ball plug pump is established, and the motion trajectory of the ball plug along the stator track during the whole movement is studied. On this basis, the change law of the contact stress of the ball plug on the stator track is studied. The actual eccentricity of the ball plug pair is solved to solve the stress and strain distribution characteristics of the eccentric plug pair contact, and the contact characteristics of the ball plug pair are theoretically studied.
On the other hand, the theoretical analysis of the contact stress of the ball plug pump has been carried out to verify the correctness of the theoretical analysis. The test rig, the naval brass ball plug pump with the design and processing pressure of about 5MPa and the test device for the friction and wear and differential leakage flow of the ball plug, and the differential pressure difference between the ball plug pump and the ball plug pump are set up. Leakage flow test.
Through the combination of theoretical modeling and numerical simulation, the contact and stress strain characteristics of the ball plug pair are studied, and the essential characteristics are provided for the experimental research on the stress and strain characteristics of the ball plug contact. Based on the fluid elastic equation, the deformation model describing the ball plug pair is established, and the leakage flow under the condition of the ball plug pair is measured. In order to indirectly evaluate the reliability of the seal formed by the deformation, the stress and strain characteristics of the ball pump are finally determined by combining all the above studies.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38

【参考文献】