Spool Poppet Valve Structure for Fast Switching and Leak Prevention
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Solution Overview
Problem
Conventional fluid control devices with long spool land portions suffer from reduced control responsiveness due to the time required to switch between input and output chambers, potentially leading to fluid leakage.
Innovation Solution
A normally closed fluid control device with a spool and housing land portions forming a poppet valve structure, featuring a large diameter portion and a twisted portion, which allows for quick communication between the input and output chambers when driven by an external force, enhancing control responsiveness while preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spool land portion is made sufficiently long to prevent fluid leakage, then sealing reliability is improved, but control responsiveness deteriorates due to delayed communication between chambers
Solution Approach 1:
The spool is segmented into multiple functional portions: a first spool land portion for sealing, a second spool land portion with notches for flow control, and a large diameter portion forming a poppet valve. This segmentation allows each portion to perform its specific function optimally without compromising overall performance
Solution Approach 2:
Instead of relying solely on a long spool land portion for sealing, the invention inverts the approach by using a poppet valve structure (large diameter portion) that provides sealing through a different mechanism - radial contact with the housing land portion rather than axial overlap, thereby achieving sealing without sacrificing responsiveness
2Speed
If the spool land portion is made short to improve control responsiveness, then switching speed is improved, but fluid leakage occurs from input chamber to output chamber
Solution Approach 1:
The spool is divided into distinct functional zones: the first spool land portion handles sealing, the second spool land portion manages flow switching through notches, and the large diameter portion provides poppet valve sealing. This allows the spool land portion to be short while maintaining sealing through the poppet valve mechanism
Solution Approach 2:
The large diameter portion acts as an intermediary sealing element between the spool and housing, forming a poppet valve that provides reliable sealing without requiring a long spool land portion, thus enabling short spool design while preventing leakage
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 poppet valve structure ensures reliable sealing and quick communication between chambers, improving control responsiveness and preventing fluid leakage, thus enhancing the fluid control device's performance.
Implementation Method 1
a biasing member configured to bias the spool toward a valve closing position of the spool
Implementation Method 2
the large diameter portion and the housing land portion form a poppet valve structure
Data Source
AI summary
A fluid control device includes a housing partitioned into an input chamber and an output chamber by a housing land portion extending on the radially inner side, a spool arranged inside the housing and provided with a spool land portion that is configured to reciprocatively slide with respect to the housing land portion and that extends on a radially outer side of the spool, and a biasing member configured to bias the spool toward a valve closing position, wherein upon receiving drive force from an exterior, the spool is moved against bias force of the biasing member, and the input chamber and the output chamber communicate with each other, the spool includes a large diameter portion arranged in the input chamber and having a larger diameter than the spool land portion, and the large diameter portion and the housing land portion form a poppet valve structure.