The Analysis And Research Of The Water Medium Limited Of The Impeller Type Hydraulic Coupling

With the traditional energy exhausting, hydraulic coupler as a widely popularized energy-conserving product has been extensive used on the scraper conveyor. Due to the special environment of coal mine underground, the technology to use water as a media in place of traditional mineral oil will have a wide market prospect in the coal mining fields.Water medium limited moment type hydraulic coupler mainly depends on pump impeller and turbine. When rotating, hydraulic coupler relying mainly on the pump impeller and turbine makes the water rotate to transmit power. So it works steadily because of the rationality of pump impeller and turbine and this kind of rationality is presented on its ability to resist vibration. As the key components to pass the power of hydraulic coupler, pump impeller and turbine play important parts in the converting of liquid kinetic energy and mechanical energy. It is necessary to make an analysis on stress condition in the process of designing impeller. Whether the designing is accurate or not has an important effect on the analysis. In the process of rotating of pump impeller and turbine on hydraulic coupler, they bear the effects of liquid centrifugal force, liquid pressure and air pressure. It is a complicated process. In addition, when the blade of hydraulic coupler is attacked, the vibration will be generated. When the frequency of the blade is close to that produced by the water, the sympathetic vibration will be generated. As a result of the sympathetic vibration, pump impeller and the turbine will be destroyed. In this paper, the writer makes a research on the strength and vibration of pump impeller and turbine. It will be of great significance on the optimization design of hydraulic coupler, the stable operation of the scraper conveyor and preventing accidents.According to the characteristics of blade of hydraulic coupler typed YOXD650and its operational factors, the paper adopting the8nodes hexahedron units established finite element model of the impeller first deduces the Coupler impeller static finite element equations. Then the3d modeling software pro/E is used to make a3d mockup. The writer analyzes the impeller and blade strength in the finite element analysis software ANSYS and the analysis directly shows the position of blade stress concentration, figures out the maximum of the stress and validates the reliability of its strength. The author thinks that you can add proper leaf number and the wall round of impeller shell thru the transition to lessen the stress concentration. The forces are complicated when pump impeller and turbine are working, so the sympathetic vibration may be produced. Through the modal analysis of pump impeller, turbine and blades the paper concludes that the sympathetic vibration may be produced when the pump wheels that dynamic vibration frequency and6to order in similar frequency.