Spool Valve Sleeve Groove for Dynamic Pressure Absorption
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Solution Overview
Problem
Spool valves in fluid circuits face difficulties in smooth operation due to high frictional forces between the spool and sleeve caused by fluid dynamic pressure, especially when high-pressure fluids are used, leading to unpredictable control.
Innovation Solution
A spool valve design featuring a sleeve with a supply groove that includes an inlet space and an outlet space, where the fluid flows from the fluid supply hole into the inlet space and then to the outlet space, absorbing the dynamic pressure and allowing smooth spool control regardless of fluid pressure levels, with features like annular grooves, partition walls, and cutouts to manage fluid flow and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high-pressure fluid is supplied to the spool valve, then the control pressure increases, but the frictional force between spool and sleeve increases causing difficult control
Solution Approach 1:
The supply groove is formed in advance on the outer periphery of the sleeve to create an inlet space that receives fluid before it reaches the spool. This preliminary action allows the fluid to be contained and pressure-equalized before contacting the spool, preventing sudden pressure surges that would increase frictional force
Solution Approach 2:
The supply groove acts as an intermediary structure between the fluid supply and the spool. It includes an inlet space and outlet space that mediate the fluid's path, allowing pressure to be distributed evenly around the spool's outer periphery rather than creating concentrated high-pressure zones that would increase friction
2Stress or pressure
If the spool is pressed against the sleeve by supply dynamic pressure, then the fluid pressure is maintained, but the spool cannot be moved smoothly
Solution Approach 1:
The supply groove creates localized pressure distribution zones at different locations (inlet space and outlet space) around the spool's outer periphery. This local quality approach ensures pressure is applied uniformly at multiple points rather than concentrated at one location, preventing the spool from being pressed tightly against the sleeve at any single point
Solution Approach 2:
The inlet space of the supply groove is formed in advance to receive and contain the supplied fluid before it reaches the spool. This preliminary containment allows the fluid pressure to be equalized and distributed evenly, preventing sudden pressure spikes that would press the spool against the sleeve and hinder smooth movement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures smooth spool control across varying fluid pressures by absorbing dynamic pressure, reducing frictional forces and enabling precise control, even under high-pressure conditions.
Implementation Method 1
when the fluid supplied from the fluid supply hole into the supply groove first flows into the inlet space, the supply dynamic pressure thereof is absorbed, and when it then moves to the outlet space formed on the side of the inflow port, the supply dynamic pressure thereof is further absorbed
Data Source
AI summary
A spool valve includes a sleeve and a spool arranged on an inside of a sleeve to be movable in a longitudinal direction, the sleeve being provided with an inflow port into which fluid is supplied from an external fluid supply hole, and an outflow port through which the fluid is flown to an outside of the sleeve, wherein a supply groove is formed on an outer periphery of the sleeve, and the supply groove includes an inlet space into which the fluid flows from the fluid supply hole and an outlet space formed on a side of the inflow port with respect to the inlet space in an axial direction.