Electromagnetic Suction Valve Stopper Layout Against Fuel Force Closure
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Solution Overview
Problem
The electromagnetic suction valve in high-pressure fuel supply pumps can be closed by fluid force when the electromagnetic coil is in an unenergized state, leading to uncontrollable discharge of fuel.
Innovation Solution
The electromagnetic suction valve includes a valve part that remains open when unenergized, with a stopper featuring a bottom section and side wall section that have fuel passage holes, where the non-overlapping area of these holes is greater than the overlapping area, reducing fluid force impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electromagnetic suction valve is designed to open when unenergized, then the valve can allow fuel flow when needed, but the valve may be closed by fluid force of fuel when unenergized, leading to loss of control
Solution Approach 1:
A stopper is introduced as an intermediary component between the fuel passage and the valve part. The stopper includes fuel passage holes that allow fuel to pass through while its positioning surface restricts the valve part's movement. This intermediary structure enables the valve to remain controllable in the open position by preventing excessive displacement caused by fuel fluid force, while still allowing normal fuel flow through the passage holes.
2Adaptability or versatility
If the valve part is allowed to move freely to control fuel discharge, then the valve can respond to electromagnetic actuation, but the valve becomes susceptible to closing due to fuel pressure when unenergized
Solution Approach 1:
The stopper serves as a mediator that filters out the harmful effect of fuel fluid force on the valve part. The fuel passage holes allow fuel to flow through the stopper, reducing direct pressure impact on the valve part, while the positioning surface provides mechanical support to prevent unwanted valve closure. This intermediary structure protects the valve from harmful fluid forces while maintaining its adaptability to electromagnetic actuation.
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
Prevents the valve from closing due to fluid force, ensuring controlled fuel discharge and improved controllability of the discharge flow rate.
Implementation Method 1
when the electromagnetic coil is energized, a magnetic attractive force is generated, and thus the valve body moves against the biasing force of the spring
Implementation Method 2
a valve body is biased by a biasing force of a spring and enters an open state
Implementation Method 3
the electromagnetic suction valve may be closed by a fluid force of the fuel flowing back from a pressurizing chamber side
Data Source
AI summary
The purpose of the present invention is to prevent a suction valve from closing due to fluid force when an electromagnetic coil is in an unenergized state. This electromagnetic suction valve comprises: a valve part that is in an open state when not energized and opens/closes a fuel introduction opening; and a stopper that has a bottom section that abuts the valve part in an open state in which the valve part has opened the fuel introduction opening, and a side wall section that faces a side circumferential surface of the valve part. The bottom section of the stopper has a plurality of fuel passage holes. In the direction that the bottom section of the stopper and the valve section face each other, the area of a portion in each of the plurality of fuel passage holes that does not overlap the valve part is greater than the area of a portion that overlaps the valve part.