Gas Fuel Injector Spring Retainer for Dynamic Flow Adjustment
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Solution Overview
Problem
Conventional electromagnetic fuel injectors with a valve closed by attracting a valve body to a seat face challenges in adjusting the dynamic flow rate due to structural difficulties in setting the spring load, making precise control of fuel injection rates difficult.
Innovation Solution
A gas fuel injector design incorporating a retainer between a closing spring and an adjustment spring, allowing for adjustable set loads by positioning a plug, enabling easy assembly and adjustment of the dynamic flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve body is attracted to a valve seat to close the valve, then valve leakage is prevented, but it becomes structurally difficult to adjust spring load and dynamic flow rate
Solution Approach 1:
The spring system is segmented into two independent springs: a closing spring that provides the primary closing force and an adjustment spring that controls the dynamic flow rate. This segmentation allows independent adjustment of each spring's load without affecting the other, solving the structural difficulty of adjusting spring load in attracted-type valves.
Solution Approach 2:
A retainer component is introduced as an intermediary element between the two springs. The retainer transmits and balances the forces from both the closing spring and adjustment spring to the valve body, enabling complex force interactions while maintaining a compact structure that allows for easy adjustment of the adjustment spring.
2Productivity
If the spring load is fixed, then the structure is simple, but the dynamic flow rate cannot be adjusted
Solution Approach 1:
The spring system transitions from a fixed load configuration to a dynamic adjustable configuration. The adjustment spring can be repositioned or replaced to change its set load, allowing the dynamic flow rate to be adjusted according to different operating conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The set load of the adjustment spring is changed by modifying its installation position or replacing it with springs of different characteristics. This parameter change enables the dynamic flow rate to be tuned without fundamentally redesigning the entire valve structure, balancing adjustability with structural simplicity.
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
Enables precise control of the dynamic flow rate in gas fuel injectors, accommodating manufacturing variations and ensuring stable, accurate fuel injection.
Implementation Method 1
a solenoid disposed in the main body and configured to open the opening/closing valve at the time of energization
Implementation Method 2
a closing spring configured to bias the plunger in a valve closing direction
Implementation Method 3
an adjustment spring configured to bias the plunger in a valve opening direction
Data Source
AI summary
A gas fuel injector of an electromagnetic drive type includes a cylindrical main body in which a fuel passage is formed, an opening/closing valve configured to open and close the fuel passage, a solenoid configured to open the opening/closing valve, and a nozzle provided at a distal end portion of the main body. The opening/closing valve includes a valve body configured to reciprocate together with a plunger constituting the solenoid and a valve seat configured to come into contact with and be separated from the valve body. The plunger is fixed to a retainer provided on an upstream side of the opening/closing valve. The retainer is installed between a closing spring configured to bias the plunger in a valve closing direction and an adjustment spring configured to bias the plunger in a valve opening direction.