Spool Valve Supply Groove for Smooth High-Pressure Control
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Solution Overview
Problem
The spool in a spool valve may not move smoothly due to high frictional forces generated by the supply dynamic pressure of high-pressure fluids, making precise control difficult.
Innovation Solution
The spool valve design incorporates a supply groove on the sleeve with an inlet and outlet space, featuring a partition wall with communication portions to absorb the supply dynamic pressure, allowing the spool to move smoothly regardless of fluid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high-pressure fluid is supplied to the spool valve, then the fluid control capability is improved, but the spool cannot move smoothly due to increased frictional force
Solution Approach 1:
A supply groove is introduced as an intermediary structure between the fluid supply and the spool. This groove includes an inlet space and an outlet space that communicate with each other, allowing the fluid to change direction and absorb dynamic pressure before reaching the spool, thereby reducing the frictional force on the spool while maintaining high fluid control pressure
Solution Approach 2:
The supply groove is divided into multiple spaces (inlet space and outlet space) separated by a partition wall with communication portions. This segmentation allows the fluid to flow through multiple stages, absorbing dynamic pressure incrementally and reducing the direct impact on the spool
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 effectively absorbs the supply dynamic pressure, enabling smooth spool control and preventing the spool from being pressed against the sleeve, thus facilitating precise fluid control even at high pressures.
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
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AI summary
To provide a spool valve in which a spool is smoothly controlled regardless of whether the pressure of fluid is high or low. A spool valve includes a sleeve (21) and a spool (23) arranged on an inside of a sleeve (21) to be movable in a longitudinal direction, the sleeve (21) being provided with an inflow port (24) into which fluid is supplied from an external fluid supply hole (8b), and an outflow port (25) through which the fluid is flown to an outside of the sleeve (21), wherein a supply groove (4) is formed on an outer periphery of the sleeve (21), and the supply groove (4) includes an inlet space (T) into which the fluid flows from the fluid supply hole (8b) and an outlet space (R) formed on a side of the inflow port (24) with respect to the inlet space (T) in an axial direction.