Fuel Injector Ring Body for Jam-Free Media Separation
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Solution Overview
Problem
Fuel injector rod-shaped elements tend to jam due to narrow guide gaps, which are prone to clogging and require complex multi-part designs to prevent jamming, increasing manufacturing effort and not always ensuring reliable separation of media like fuel gas and control fluid.
Innovation Solution
A fuel injector arrangement featuring a chamber with a ring body that provides radial play, allowing the rod-shaped element to pass through with wider radial clearance, and a ring body that is pressurized to seal against chamber end faces, ensuring media separation and guiding the element while compensating for potential offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow guide gaps are used to minimize leakage and separate media, then media separation and leakage prevention are improved, but the rod-shaped element tends to jam and the guide gaps become clogged
Solution Approach 1:
A ring body is nested within the chamber, surrounding the rod-shaped element. The ring body acts as an intermediate structure that the rod-shaped element passes through, providing guidance while maintaining media separation. This nested configuration allows the rod-shaped element to move freely without direct contact with the chamber walls, preventing jamming while maintaining effective sealing.
2Object-affected harmful factors
If a multi-part design of the rod-shaped element is used to prevent jamming, then jamming is reduced, but the number of parts increases and manufacturing effort increases
Solution Approach 1:
The ring body serves as an intermediary element between the chamber and the rod-shaped element. It provides the necessary guidance and clearance for the rod-shaped element to move without jamming, while maintaining media separation. This intermediary structure allows a simple one-piece rod-shaped element to function reliably without requiring complex multi-part designs.
3Ease of manufacture
If wide radial clearance is used for the rod-shaped element in receptacles, then manufacturing is simplified and jamming is prevented, but media leakage increases
Solution Approach 1:
The ring body is nested within the chamber and surrounds the rod-shaped element, creating a hierarchical structure. The rod-shaped element passes through the ring body with wide clearance, and the ring body itself is surrounded by the chamber with its own clearance. This nested arrangement allows wide clearances at both levels while maintaining media separation through the ring body's positioning and the chamber's sealing 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 solution enables reliable self-sealing and media separation with reduced manufacturing complexity, allowing for wider radial gaps and improved guidance of the rod-shaped element, preventing clogging and ensuring effective operation under varying pressure conditions.
Implementation Method 1
the ring body is provided, in particular subjected to media pressure, to be displaced when pressurized by the media pressure and pressed against an end face (23, 25) of the chamber (11), thereby sealing against media ingress into the chamber (11)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Arrangement (9) comprising: a chamber (11) which is formed between a first (19) and a second (21) receptacle for a rod-shaped element (7), wherein the receptacles (19, 21) open out onto the chamber (11) on opposite end sides (23, 25) thereof; a rod-shaped element (7) which is received in the receptacles (19, 21) via a respective portion (27, 29) with radial play, in this respect with a receptacle radial play, and which rod-shaped element (7) passes through the chamber (11); and an annular body (65) which is arranged in the chamber (11) and through which the rod-shaped element (7) passes with radial play, in this respect an annular body radial play, wherein the annular body radial play is less than the receptacle radial play, wherein the arrangement (9) comprises a first (61) and a second (63) media side which are connected via the first (19) and second (21) receptacle, respectively, to the chamber (11), wherein the annular body (65) is provided to be pressed into contact with an end side (23, 25) of the chamber (11).