叶片泵的热润滑特性实验研究
发布时间：2018-10-29 15:30
【摘要】：作为液压系统的核心部件，叶片泵因具有运行平稳、流量均匀、噪音小、体积小等特点而被广泛应用。为适应现代液压系统高效、节能、环保的要求，叶片泵必须提高自身性能，向高压化、高效率化、耐久化、低噪声化方向努力，满足液压系统的发展要求。 叶片泵在运转时，不可避免地会产生磨损的现象。特别在高压情况下，，容易发生流量泄露、压力脉动、噪音大、液压油温过高等问题，严重影响泵的性能和使用寿命。 本文选取双作用叶片泵作为研究对象，针对其高压化过程产生的温升过快、泄漏加剧、效率低下等问题，从摩擦学的角度进行了实验分析与探讨。 实验找出叶片泵摩擦最严重的部位（凸轮定子吸入口处）进行重点观察与分析，先后使用4种液压油、3种不同厚度的叶片进行实验，考察它们与叶片泵的入口油温、吐出压力、回转速度、观测点的温升及效率间的相互关系。通过实验曲线分析出液压油种类、叶片厚度、出口压力及转速对观测点温度上升的影响，并得到了叶片厚度与机械效率极限值、温度与体积效率、温度与机械效率的理论关系及拟合曲线。 最后，针对实验中高压运转时叶片泵噪音过大的现象，分别在泵的外壁侧面及出口处安装了3轴的加速度传感器与小型压力传感器，采用小波包络的方法，从流体噪音与机械振动两方面分析，发现叶片顶端与凸轮定子内表面间的摩擦加剧是导致高压下叶片泵噪音过大的主要原因。
[Abstract]:As the core component of hydraulic system, vane pump is widely used because of its characteristics of smooth operation, uniform flow, low noise and small volume. In order to meet the requirements of high efficiency, energy saving and environmental protection of modern hydraulic system, the vane pump must improve its own performance and make great efforts in the direction of high pressure, high efficiency, durability and low noise to meet the requirements of the development of hydraulic system. Vane pump in operation, will inevitably produce the phenomenon of wear. Especially under high pressure, flow leakage, pressure pulsation, high noise, high temperature of hydraulic oil and other problems are easy to occur, which seriously affect the performance and service life of the pump. In this paper, the double-acting vane pump is chosen as the research object, and the experimental analysis and discussion are carried out from the angle of tribology, aiming at the problems of excessive temperature rise, increased leakage and low efficiency caused by the high pressure vane pump. The most serious friction position of vane pump (inlet of cam stator) was found out in the experiment. Four kinds of hydraulic oil and three kinds of blades of different thickness were used successively to investigate the inlet oil temperature of vane pump. The relationship between exhaling pressure, velocity of rotation, temperature rise at observation point, and efficiency. The effects of hydraulic oil types, blade thickness, outlet pressure and rotational speed on the temperature rise at the observation point are analyzed through the experimental curves. The limit values of blade thickness and mechanical efficiency, temperature and volume efficiency are obtained. The theoretical relationship between temperature and mechanical efficiency and the fitting curve. Finally, aiming at the phenomenon of excessive noise of vane pump in high pressure operation, three axis acceleration sensors and small pressure sensors are installed on the side of the external wall and the outlet of the pump, respectively, and wavelet envelope method is used. From the analysis of fluid noise and mechanical vibration, it is found that the increase of friction between the tip of the blade and the inner surface of the cam stator is the main cause of the excessive noise of the vane pump under high pressure.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH31
本文编号：2298087
[Abstract]:As the core component of hydraulic system, vane pump is widely used because of its characteristics of smooth operation, uniform flow, low noise and small volume. In order to meet the requirements of high efficiency, energy saving and environmental protection of modern hydraulic system, the vane pump must improve its own performance and make great efforts in the direction of high pressure, high efficiency, durability and low noise to meet the requirements of the development of hydraulic system. Vane pump in operation, will inevitably produce the phenomenon of wear. Especially under high pressure, flow leakage, pressure pulsation, high noise, high temperature of hydraulic oil and other problems are easy to occur, which seriously affect the performance and service life of the pump. In this paper, the double-acting vane pump is chosen as the research object, and the experimental analysis and discussion are carried out from the angle of tribology, aiming at the problems of excessive temperature rise, increased leakage and low efficiency caused by the high pressure vane pump. The most serious friction position of vane pump (inlet of cam stator) was found out in the experiment. Four kinds of hydraulic oil and three kinds of blades of different thickness were used successively to investigate the inlet oil temperature of vane pump. The relationship between exhaling pressure, velocity of rotation, temperature rise at observation point, and efficiency. The effects of hydraulic oil types, blade thickness, outlet pressure and rotational speed on the temperature rise at the observation point are analyzed through the experimental curves. The limit values of blade thickness and mechanical efficiency, temperature and volume efficiency are obtained. The theoretical relationship between temperature and mechanical efficiency and the fitting curve. Finally, aiming at the phenomenon of excessive noise of vane pump in high pressure operation, three axis acceleration sensors and small pressure sensors are installed on the side of the external wall and the outlet of the pump, respectively, and wavelet envelope method is used. From the analysis of fluid noise and mechanical vibration, it is found that the increase of friction between the tip of the blade and the inner surface of the cam stator is the main cause of the excessive noise of the vane pump under high pressure.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH31
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本文编号：2298087
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