Flow Control Valve Spring Support Spacing
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Solution Overview
Problem
Conventional flow control valves in evaporated fuel processing devices experience increased fluid-flow resistance due to the obstruction by the coil end of the backlash preventive spring when opened, and potential circumferential displacement of the spring, which alters the flow passage area and resistance.
Innovation Solution
The flow control valve design includes a spring supporting device with a spring seating surface spaced from the valve seat, preventing the coil end of the backlash preventive spring from obstructing fluid flow and reducing the risk of spring displacement, thereby maintaining a consistent flow passage area and minimizing fluid-flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring contact surface is formed flush with the valve seat, then the backlash preventive spring can be properly positioned and supported, but the coil end of the spring obstructs fluid flow when the valve is opened, increasing fluid-flow resistance
Solution Approach 1:
The spring contact surface is positioned in a different axial dimension relative to the valve seat, specifically spaced axially away from it. This dimensional relocation allows the spring to be properly supported while its coil end does not intrude into the fluid flow path when the valve is open, thereby reducing fluid-flow resistance without compromising spring positioning stability
2Stability of the object's composition
If the spring contact surface is positioned closer to reduce spring displacement, then circumferential displacement of the spring is prevented, but the spring may interfere with valve seat operation and increase fluid-flow resistance
Solution Approach 1:
The spring contact surface is relocated to a different axial position dimension, spaced away from the valve seat. This allows the spring to maintain stable circumferential positioning through proper support while avoiding interference with valve seat operation and fluid flow in the radial and axial dimensions where the valve seat functions
3Object-generated harmful factors
If the coil end of the spring is positioned away from the valve seat, then fluid flow is less obstructed and fluid-flow resistance decreases, but the spring may become circumferentially displaced
Solution Approach 1:
The spring contact surface is positioned in a different axial dimension, spaced away from the valve seat. This creates sufficient axial clearance for the coil end to be positioned away from the valve seat, reducing fluid-flow resistance, while still providing adequate support to prevent circumferential displacement of the spring
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 reduces fluid-flow resistance and prevents changes in the flow passage area, ensuring consistent performance by keeping the backlash preventive spring away from the valve seat when opened, thus maintaining efficient fluid flow.
Implementation Method 1
a feed screw mechanism configured to convert a forward and a reverse rotational motion of the output rotational shaft to axial reciprocating motion of the valve body
Implementation Method 2
a backlash preventive spring comprising a coil spring positioned between the housing and the valve body and configured to bias the valve body in such a direction that backlash of the feed screw mechanism is prevented
Data Source
AI summary
A flow control valve includes a housing having a valve chamber, an inlet port, an outlet port, and a valve seat. In addition, the flow control valve includes a valve body disposed in the valve chamber, an actuator having an output rotational shaft, a feed screw mechanism to convert forward and reverse rotational motion of the output rotational shaft to axial reciprocating motion of the valve body, a backlash preventive spring positioned between the housing and the valve body, and a spring supporting device formed on the housing and having a spring seating surface. The spring seating surface is spaced from the valve seat in an opening direction of the valve body.