2 results about "Static performance" patented technology

This invention discloses a locally porous helical groove gas thrust bearing and its static performance design method. The bearing includes a thrust disc, a thrust pad, a locally porous throttling device, helical grooves, a sleeve, and an end cap. The thrust pad or thrust disc is machined with pump-in helical grooves. The locally porous throttling device is made of porous material and is positioned in the groove area, platform area, or dam area of ​​the thrust pad, uniformly distributed circumferentially. The method includes: considering the inertial force of fluid flow inside the porous material, establishing a static model of the locally porous helical groove gas thrust bearing, dividing the flow field mesh, and proposing a numerical calculation method; static performance analysis of the locally porous helical groove gas thrust bearing; and static performance design of the locally porous helical groove gas thrust bearing to obtain the design variables corresponding to the maximum load capacity and static stiffness. This invention can increase the load capacity and static stiffness of the bearing at high speeds, eliminate frictional wear during start-up and shutdown, and improve the accuracy of the bearing's static performance design.

The application discloses a superimposed adjustable differential pressure reducing valve, aiming at solving the problems of the existing fixed differential pressure reducing valve, such as non-adjustable pressure difference, poor dynamic and static performance matching, and limited application scenarios. The reducing valve comprises a valve body, a pressure stabilizing and adjusting assembly arranged in the valve body, a sliding valve spool, a throttling assembly, a pressure compensation spring and a shuttle valve assembly; the pressure stabilizing and adjusting assembly adjusts the pre-tightening force of the pressure compensation spring through a pressure stabilizing valve spool in threaded cooperation with a sliding valve sleeve, realizes continuous adjustment of the pressure difference, and locks the position after adjustment through a locking nut; the throttling hole of the throttling assembly and the damping hole of the shuttle valve feedback loop are both matched through simulation optimization, and the shuttle valve assembly is compatible with bidirectional load port pressure feedback and external pressure regulating port control pressure input. The application realizes a pressure difference adjustment range of 0.5-1.5 MPa, and the maximum flow rate reaches 61.74 L / min, while high-precision fixed-difference control and high operation stability are taken into account, and the application can be widely applied to hydraulic control systems in the fields of aerospace, automobiles, engineering machinery and the like.