High-Pressure Connection Arrangement for Diesel Engine Fuel Sealing
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Solution Overview
Problem
Existing high-pressure connection systems in large diesel engines, such as screw connections and welded or soldered joints, are not structurally simple and reliable for sealing pressurized fluids, particularly in applications where high-pressure fluids like fuel and hydraulic media are involved, and they can be prone to pressure shocks.
Innovation Solution
A high-pressure connection arrangement featuring a conical first end surface and a larger circular second end surface, where the fluid pressure creates a sealing force by pressing the conical surface against a seat surface, eliminating the need for screws or welds, and is supported by a holder to dissipate pressure shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections or welded joints are used for high-pressure connections, then sealing reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The connection system uses the high-pressure fluid itself to generate the sealing force by acting on the pressure difference between the first and second end surfaces. The fluid pressure automatically presses the conical first end surface against the seat surface, eliminating the need for external fastening mechanisms like screws or welds. This self-sealing mechanism reduces structural complexity while maintaining sealing reliability under high-pressure conditions.
2Device complexity
If direct attachment of device to pressure accumulator is used, then connection simplicity is improved, but pressure shocks cause harmful forces in the pressure pipe
Solution Approach 1:
The connection system introduces an intermediary high-pressure connection component with a bore that receives the second end surface. This intermediary structure allows the device to be attached to the side of the pressure accumulator rather than directly, providing mechanical decoupling that prevents pressure shock forces from being transmitted into the pressure pipe while maintaining connection simplicity.
3Reliability
If conical first end surface is used for sealing, then sealing effect is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system uses hydraulic pressure from the high-pressure fluid to generate the sealing force that presses the conical first end surface against the seat surface. This hydraulic sealing mechanism compensates for minor variations in conical surface precision, allowing effective sealing without requiring extremely tight manufacturing tolerances. The fluid pressure adapts to ensure consistent sealing contact.
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 provides a structurally simple, reliable, and high-pressure-tight connection that effectively seals pressurized fluids without the need for screws or welds, reducing mechanical stress on the pressure accumulator and simplifying manufacturing by avoiding threaded connections.
Implementation Method 1
the sealing between the high-pressure connection and the accumulator is mainly effected by the pressure of the fluid on the second end surface
Implementation Method 2
Since the effective area for the second end face is larger than for the first end face, but the pressure exerted by the fluid is essentially the same on both end faces, in the operating state the fluid exerts a greater force on the second end face than on the first end face
Data Source
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AI summary
A high-pressure connection is proposed for connecting a device (3) operated by means of a pressurized fluid to a pressure accumulator (2) for the fluid, which has at least one connection bore (23) opening into a seat (24). This high-pressure connection comprises a body (11) extending in the direction of a longitudinal axis (A) from a first end surface (12) to a second end surface (13). The first end surface (12) is configured for sealing interaction with the seat (24) and has an inlet opening (14). The second end surface (13) is configured for reception by the device (3) and has an outlet opening (16) connected to the inlet opening (14) via a through-bore (15). The second end surface (13) has an effective area for the fluid that is larger than the effective area of the first end surface (12).Furthermore, a connection arrangement and a large diesel engine are proposed.