Fuel Pressure Regulator Cover Layout to Prevent Outlet Fuel Stagnation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel pressure regulators in fuel supply devices suffer from fuel stagnation in the outlet portion, leading to potential corrosion and deterioration of components, which reduces the durability of the device.
Innovation Solution
The pressure regulator design includes an inner and outer cover with primary and secondary communication holes, allowing branched fuel to be suctioned into a fuel space, reducing stagnation and enhancing durability by circulating the fuel and minimizing exposure to corrosive changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If branched fuel is discharged through the valve element nozzle to the outlet portion, then negative pressure is applied to the diaphragm to assist valve opening operation and reduce fuel pump load, but fuel stagnation occurs in the inside space of the cover leading to corrosion and deterioration of components
Solution Approach 1:
The harmful effect of fuel stagnation is extracted and eliminated by providing a dedicated drainage path. The drainage hole in the cover creates a separate flow path that extracts stagnated fuel from the inside space, preventing corrosion while maintaining the pressure regulation function.
Solution Approach 2:
The drainage hole acts as an intermediary element that mediates between the inside space and the outside environment. It provides a controlled pathway for fuel to exit the inside space, serving as a mediator that prevents fuel accumulation without interfering with the primary pressure regulation mechanism.
2Device complexity
If the outlet portion includes a cover that receives the resilient member in an inside space, then the structure is compact and functional, but fuel stagnation occurs at radially outward locations in the inside space
Solution Approach 1:
The drainage hole extracts stagnated fuel from dead zones in the inside space, particularly from radially outward locations where fuel naturally accumulates. This extraction mechanism removes the harmful stagnant fuel without requiring a complete redesign of the cover structure.
Solution Approach 2:
The cover is designed with a drainage hole that functions similarly to a porous structure, allowing selective passage of fuel while maintaining the structural integrity and compactness of the cover. The hole provides a controlled opening that enables fuel drainage without compromising the cover's protective function.
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 effectively limits fuel stagnation, preventing corrosion and deterioration, thereby ensuring the durability and reliability of the fuel supply device components.
Implementation Method 1
the branched fuel can be entrained by the discharged jet flow of the fuel discharged from the valve element nozzle
Implementation Method 2
a negative pressure is applied to the partition element through discharging of branched fuel, which is branched from the fuel flow passage to the inlet portion, to the outlet portion through the valve element nozzle
Data Source
AI summary
In a pressure regulator, a valve element nozzle is supported by a diaphragm, which partitions between an inlet portion and an outlet portion. The outlet portion includes an inner cover and an outer cover. The inner cover receives an adjusting spring in an inside space of the inner cover. A primary communication hole is formed in the inner cover to oppose the valve element nozzle, and a secondary communication hole is formed in the inner cover at a location, which is on a radially outer side of the primary communication hole. The outer cover covers the inner cover and thereby forms a fuel space, which is communicated with the inside space through the primary and secondary communication holes, at a location between the inner cover and the outer cover.