Rotatable Coil Depressurizing Valve for Fuel Injection
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Solution Overview
Problem
Conventional fuel injection devices face challenges in adjusting the direction of the connector for a depressurizing valve mounted to a common rail without affecting the air gap or sealing performance, particularly due to the cylindrical shape of the common rail and the need for bolt holes, and existing solutions complicate the adjustment process.
Innovation Solution
A depressurizing valve design featuring a cylindrical valve unit with a rotatable electromagnetic coil and a connecting member that maintains the air gap and sealing integrity, allowing for adjustable connector direction without altering the armature-stator core gap or requiring additional sealing checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the depressurizing valve is mounted to the common rail using a bolt hole in the cylindrical common rail, then the connector direction can be adjusted, but it is difficult to form the bolt hole due to the cylindrical shape and lack of space
Solution Approach 1:
The depressurizing valve is divided into a valve body portion and a coil unit that can be assembled separately. The coil unit is detached from the valve body, allowing the valve body to be mounted to the common rail first, and then the coil unit is attached to the valve body, enabling connector direction adjustment without requiring bolt holes in the common rail.
Solution Approach 2:
The coil unit is designed to be detachably mounted to the valve body, providing dynamic adjustability. The connector direction can be changed by detaching and reattaching the coil unit at different orientations, while the valve body remains fixed to the common rail.
2Ease of operation
If the retaining nut is loosened to adjust the connector direction, then the connector direction can be changed, but the air gap and sealing performance are affected requiring additional checks
Solution Approach 1:
The depressurizing valve is segmented into a valve body portion and a coil unit. The coil unit is completely detached from the valve body for mounting, allowing connector direction adjustment without disturbing any internal components such as the armature, stator core, or sealing members. This eliminates the risk of air gap changes and sealing performance degradation.
Solution Approach 2:
The valve body acts as an intermediary between the common rail and the coil unit. The valve body is mounted to the common rail first, establishing a stable base with proper sealing and air gap. Then the coil unit is attached to the valve body, allowing connector direction adjustment without affecting the already-established sealing and air gap between the valve body and common rail.
3Ease of manufacture
If the depressurizing valve is mounted with fixed connector direction, then the manufacturing process is simpler, but the adaptability to different mounting positions is reduced
Solution Approach 1:
The coil unit is designed with detachable mounting to the valve body, providing dynamic adjustability of the connector direction. The coil unit can be attached at different orientations to accommodate various mounting positions and connector routing requirements, while maintaining a simple and consistent manufacturing process for the valve body itself.
Solution Approach 2:
The valve body is designed as a universal mounting base that can accommodate the coil unit in multiple orientations. This allows the same valve body design to be used across different applications and mounting positions, with the coil unit's detachable attachment providing the necessary versatility for connector direction adjustment.
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 easy adjustment of the connector direction without affecting the air gap or sealing performance, reducing the need for additional sealing checks and simplifying the assembly process, while maintaining the magnetic flux attraction for the valve operation.
Implementation Method 1
a coil unit for attracting the valve body in a valve opening direction when electric current is supplied to a cylindrical electromagnetic coil
Data Source
AI summary
An object of the invention is to provide a depressurizing valve mounted to a common rail for a fuel injection device, in which a direction of a connector for the depressurizing valve can be adjusted, without affecting an air gap and a sealing performance. The depressurizing valve has a valve unit and a coil unit which is detachably assembled to the valve unit by a mounting member, such as a retaining nut. A valve housing has an inside space, which is fluid tightly separated into first and second spaces by a connecting member, which is fluid tightly connected to the valve housing and a stator core. A valve body and a spring are arranged in the first space for closing a flow control port. A cylindrical coil is accommodated in the second space, such that the coil is rotatable with respect to the valve housing.