已为您找到该学者16条结果 成果回收站
【期刊论文】STUDY ON RECIPROCATING SEALS FOR A LARGER DIAMETER AXIAL PISTON*
杨华勇, Yang Jian Yang Huayong Xu Bing
,-0001,():
-1年11月30日
Sealing performance of the reciprocating seals on a larger diameter (100 mm in diameter) axial piston is theoretically invest igated. Based on the characterist ics of the clearance flow between the seal and the piston, reasonable boundary conditions for Navier-Stokes equations are determined and the equations are modified, so that the final equations can describe the real flow state of the clearance flow. Through combining the final equations with finite element method, the pressure distributions within the clearance field during the reciprocating motion of the piston and the leakage rate with the pressure are studied. The deflections of the seal which affect sealing performance are calculated as well. Sealing performance of piston seals using oil as the working liquid is compared with using water. It is concluded that the seal using water as the working liquid is under dry friction, which cannot be dealt with the theory of fluid mechanics. The seal structure is only acceptable using oil as the working liquid..
diameter axial piston, Reciprocating seals, Sealing performance
-
65浏览
-
0点赞
-
0收藏
-
0分享
-
253下载
-
0
-
引用
【期刊论文】Simulations and experiments for two new kinds of floatation cyclones with natural inlet air
杨华勇, Yang Jian*, Yang Huayong, Xu Bing
,-0001,():
-1年11月30日
A novel structure floatation cyclone with natural inlet air has been designed, and its structural characteristics and floatation principle have been analyzed. Simulations of the velocity and pressure distributions within the flow field of the floatation cyclone have been carried out using Navier Stokes equations and fluid mechanics of two-phase. Based on the flow characteristics of the coal-water slurry, reasonable boundary conditions are decided and the equations are modified, so that the final equations can describe the real flow state of the flow field of the floatation cyclone. The boundary surface position between float coal and tailings is determined and there is an air cylinder in the central region of the floatation cyclone. The research reveals the floatation mechanism of the floatation cyclone. The floatation results can be greatly improved by regulating the structural dimensions of cyclone. The experimental results show that the floatation cyclone is very effective for the floatation of fine coal grains.
Floatation cyclone, Natural inlet air, Simulations, floatation mechanism, floatation of fine coal grains
-
36浏览
-
0点赞
-
0收藏
-
0分享
-
126下载
-
0
-
引用
【期刊论文】Research on materials of piston and cylinder of water hydraulic pump
杨华勇, Yang Huayong, Yang Jian and, Zhou Hua
Industrial Lubrication and Tribology Volume 55. Number 1. 2003. pp38-43.,-0001,():
-1年11月30日
In this paper, experiments were carried out to study the friction and wear performance for the materials of piston and cylinder in a water hydraulic axial piston pump. The matching of 940 stainless steel circle with F102 engineering plastics block and 940 stainless steel circle with Al2O3 ceramic block were also studied. The wearing capacities were calculated by theoretical formulae based on the grinding crack widths. When pure water is used as hydraulic transmission medium, it is better to use ceramic with engineering plastics as matching materials for the piston and cylinder of water hydraulic axial piston pump. The experimental results have provided a theoretical basis for selecting the matching materials of piston and cylinder.
Water,, Pumps, Cylinder, Wear
-
59浏览
-
0点赞
-
0收藏
-
0分享
-
149下载
-
0
-
引用
杨华勇
,-0001,():
-1年11月30日
-
51浏览
-
0点赞
-
1收藏
-
0分享
-
171下载
-
0
-
引用
杨华勇
,-0001,():
-1年11月30日
-
39浏览
-
0点赞
-
0收藏
-
0分享
-
127下载
-
0
-
引用