Study On Viscous Heating And Structure Deformation Of Throttle Valve With V-notches

Throttle valve is used as control element to dominate hydraulic oil flux in fluid power transmission and control systems. The reliability of throttle valve is important to the system operation. However, throttle valve is source of high temperature in hydraulic system, and temperature increasing around notches due to viscous heating effect of hydraulically oil may cause valve heat stick or jam fault under some work conditions, which cause abnormal problems such as low efficiency, high energy and deadlock fault of sleeve and spool during operation. In this paper, this phenomenon was studied by numerical fluid-solid coupling method on throttle valve with V-notchesFirstly, this thesis explained generation mechanism by numerical simulation method: Heat deadlock fault of sleeve and spool happens to valve when radial deformation value exceeds the allowable radial clearance between the spool and valve sleeve, which because the viscous heating effect of the high speed and shear oil flow with large viscosity inside the valve is significantly, and then it causes serious thermal deformation of throttle valve around notches.Afterwards, this paper analyzed the influence of flow directions, structural parameters as well as work pressure drop on temperature and thermal deformation distribution: The thermal deformation distribution inside V-notches is closely related to oil flow direction and notch structural parameters. And the change of pressure drop also produces affects as the secondary influencing element. Finally, the process of thermal deformation during valve opening period was investigated. Thus these studies provided theoretical reference for designers.