Fueling Nozzle Flow Control With Wear-Resistant Small Valve
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Solution Overview
Problem
Existing fueling nozzles face challenges in adjusting a minute flow rate while ensuring durability of the main valve, particularly due to wear caused by load concentration on the outer periphery of the through-hole.
Innovation Solution
The fueling nozzle incorporates a small valve with a protruding part and notches/slopes that adjust the opening degree of the through-hole by surface contact, distributing the load and preventing wear, allowing precise flow rate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conical small valve is used to adjust the opening degree of the through-hole, then flow rate adjustment precision is improved, but load concentration on the outer periphery of the through-hole causes main valve wear
Solution Approach 1:
The invention introduces notches at specific positions on the small valve's outer peripheral surface to create localized contact points with the through-hole. This concentrates the load-bearing function at discrete locations rather than distributing it across the entire conical surface, preventing wear while maintaining flow rate control capability
Solution Approach 2:
The small valve's outer peripheral surface is segmented into multiple notches instead of being a continuous conical surface. This segmentation allows the valve to contact the through-hole at multiple discrete points, distributing the load across several locations and preventing concentration of stress that would cause wear
2Productivity
If the small valve contacts the through-hole outer periphery for flow rate control, then minute flow rate adjustment is achieved, but sealing effectiveness deteriorates due to wear
Solution Approach 1:
Notches are positioned at specific locations on the small valve to create localized contact zones with the through-hole. This maintains precise flow rate control at the notch positions while preserving the integrity of other areas for sealing functions
Solution Approach 2:
The notched structure is designed in advance to prevent wear before it occurs. By creating controlled contact points through notches, the design anticipates and prevents the wear that would otherwise compromise sealing effectiveness
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 solution enables stable and precise adjustment of minute flow rates without concentrating load on the small valve, enhancing durability and maintaining sealing effectiveness.
Implementation Method 1
constantly biased in the closing direction by a spring 2
Implementation Method 2
The small valve 18 comes into surface contact with an outer surface of the through-hole 17 of the main valve 15
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
[OBJECT] To provide a fueling nozzle capable of easily adjusting a minute flow rate while improving durability of a main valve constituting a flow rate control mechanism. [SOLUTION] In a fueling nozzle that receives a liquid from a fueling hose at an inflow port 11 and discharges it from a nozzle end part 16 through a main valve 15 that is opened and closed with a fueling lever 14 through a valve rod 13 that always biased in a closed valve direction, a flow control mechanism 19 that can be operated with the fueling lever 14 is mounted upstream of the main valve 15. The flow control mechanism 19 includes a through-hole 17 formed in the main valve 15 and a small valve with a protruding part 21 that can block the through-hole 17 and advance and retreat in the through-hole 17.