Spool Valve Elongated Cross-Section Flow Rate
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Solution Overview
Problem
Conventional spool valves face challenges in increasing the effective cross-sectional area of flow paths without expanding the valve width, which restricts the flow rate of pressure fluid.
Innovation Solution
The spool valve design features an elongated cross-sectional shape for the valve hole and spool, with parallel side walls and semicircular end walls, allowing for increased cross-sectional area without increasing the valve width, and incorporates an electromagnetic pilot valve for efficient flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diameter of the valve hole and spool is increased to increase the effective cross-sectional area of the flow paths, then the flow rate is improved, but the valve width increases leading to larger overall size
Solution Approach 1:
The invention transitions from a conventional circular cross-sectional shape to an elongated shape with parallel side walls and semicircular end walls. This dimensional change allows the flow path cross-sectional area to be increased along the longitudinal axis rather than radially, thereby increasing flow rate without increasing the valve width (lateral dimension). The elongated shape creates additional flow area in the length direction while maintaining compact lateral dimensions.
2Productivity
If the stroke of the spool and opening width of ports are increased to increase the effective cross-sectional area, then the flow rate is improved, but the cross-sectional area of flow paths around the shaft portions remains restricted
Solution Approach 1:
The elongated cross-sectional shape of the spool and valve hole creates additional flow area around the shaft portions by extending the parallel side walls. This allows the flow paths surrounding the shaft portions to have a larger cross-sectional area compared to conventional circular designs, as the elongated geometry provides more lateral space for fluid flow in the regions adjacent to the shaft portions.
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
This design effectively increases the cross-sectional area of the flow paths between the valve hole and spool, enhancing the overall flow rate without enlarging the valve width, thus achieving a compact and high-flow spool valve configuration.
Implementation Method 1
a pilot valve portion that applies a propulsive force in one direction and a return force in the opposite direction due to pilot fluid to the spool
Data Source
AI summary
The cross-sectional shape of a valve hole is an elongated shape having a long axis and a short axis, and has left and right hole side walls that are parallel to each other, a first hole end wall that connects one ends of the left and right hole side walls, and a second hole end wall that connects the other ends of the left and right hole side walls, and the cross-sectional shape of land portions of a spool is an elongated shape having a long axis and a short axis, and has left and right land side walls that are parallel to each other, a first land end wall that connects one ends of the left and right land side walls, and a second land end wall that connects the other ends of the left and right land side walls.