Tripartite Valve Seat Decouples Spray Orifice From Base Body
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Solution Overview
Problem
Existing fuel injectors with positive connections between the base body and spray-orifice disk experience tensile stresses due to needle impact, limiting the configuration of spray orifices and affecting spray formation and tightness, restricting wall thickness and geometry for optimal performance.
Innovation Solution
A tripartite valve seat design featuring a base body, spray-orifice disk, and clamping ring with nonpositive connections, allowing for independent configuration of the spray-orifice disk and reduced tensile stresses by decoupling the spray-orifice disk from the base body, using frictional connections instead of welding, and enabling optimal material selection for each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a positive connection (welding) is used between the base body and spray-orifice disk, then a secure structural connection is achieved, but tensile stresses are introduced into the spray-orifice region during operation leading to potential tears and negative effects on spray formation and tightness
Solution Approach 1:
The valve seat is divided into three separate components: base body, spray-orifice disk, and clamping ring. This segmentation allows the spray-orifice disk to be mechanically decoupled from the base body, eliminating the transmission of tensile stresses from needle impact to the spray orifices while maintaining structural integrity through frictional connections and clamping forces.
2Stability of the object's composition
If the spray-orifice disk is securely connected to the base body, then structural stability is achieved, but the spray-orifice disk must also assume a supporting function against needle impact, limiting the configuration of spray orifices and wall thickness
Solution Approach 1:
By segmenting the valve seat into separate components and using nonpositive connections, the spray-orifice disk is relieved of the supporting function against needle impact. This allows the spray-orifice disk to be optimized purely for spray formation with flexible geometry and wall thickness configurations without structural compromises.
Solution Approach 2:
The base body is designed with a specifically shaped receiving space that provides local structural support and stress distribution, while the spray-orifice disk focuses exclusively on spray formation. This local quality differentiation allows each component to be optimized for its specific function.
3Strength
If a positive connection is used between the spray-orifice disk and base body, then a rigid structural bond is achieved, but vibrational stressing of the spray-orifice disk by tensile stresses cannot be avoided
Solution Approach 1:
The clamping ring acts as an intermediary component that applies radial clamping force to secure the spray-orifice disk to the base body through frictional connection. This intermediary mechanism provides secure attachment without creating the rigid structural bond that transmits vibrational stresses and tensile forces to the spray-orifice disk.
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 minimizes vibrational stresses on the spray-orifice disk, allowing for customizable geometry and material selection, enhancing spray formation, reducing emissions, and supporting higher system pressures without the limitations of positive connections.
Implementation Method 1
a securing is realized merely by a frictional connection rather than an intermaterial connection such as with the aid of a welded connection or the like
Data Source
AI summary
An injector for injecting a fluid includes a base body having an opening and a sealing seat, a spray-orifice disk having at least one spray orifice, and a clamping ring, the spray-orifice disk being disposed in the opening of the base body, and a first nonpositive connection is provided between the spray-orifice disk and the base body, and a second nonpositive connection is provided between the base body and the clamping ring.