Piston Sealing Structure for High-Pressure Pump Stability
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Solution Overview
Problem
Existing high-pressure fuel pump designs face challenges in achieving optimized sealing, particularly under high pressures, which can lead to reduced sealing effectiveness and stability due to increased pressure loads on main sealing elements.
Innovation Solution
The design incorporates an additional sealing element, such as a PTFE-based sealing ring with a cuboid cross-section and radially projecting sealing edges, which is mounted in a floating manner and arranged to create a pressure drop between the high-pressure and low-pressure spaces, reducing the load on the main sealing element and enhancing the sealing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main sealing element is used to separate media chambers, then sealing function is achieved, but under high pressure the sealing effectiveness decreases and stability is reduced
Solution Approach 1:
The sealing function is divided into two independent parts: a main sealing element for primary sealing and an additional sealing element for secondary sealing. The additional sealing element is arranged to seal between the piston and piston receptacle, while the main sealing element handles the primary media separation. This segmentation allows each sealing element to operate under optimized conditions, with the additional element protecting the main element from excessive pressure loads.
Solution Approach 2:
The additional sealing element acts as an intermediary protective layer between the high-pressure environment and the main sealing element. By placing this additional sealing element in the pressure path, it mediates the pressure load, preventing direct exposure of the main sealing element to full high-pressure stresses, thereby extending its service life and maintaining sealing effectiveness.
2Reliability
If multiple sealing elements are added to improve sealing, then sealing performance increases, but device complexity increases
Solution Approach 1:
The sealing system is segmented into two functional zones: primary sealing by the main sealing element and secondary sealing by the additional sealing element. This segmentation is achieved by placing the additional sealing element in a different location (between piston and piston receptacle) rather than stacking multiple sealing elements in the same location, thus improving sealing without proportionally increasing complexity.
Solution Approach 2:
The additional sealing element serves multiple functions: it provides secondary sealing, protects the main sealing element from pressure loads, and seals the gap between the piston and piston receptacle. This multi-functionality justifies the addition of the extra sealing element by delivering multiple benefits from a single component addition.
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 configuration optimizes the sealing performance by minimizing leakage and increasing the stability of the main sealing element, thereby improving the overall sealing efficiency and extending its service life.
Implementation Method 1
arranged to create a pressure drop between the high-pressure and low-pressure spaces, reducing the load on the main sealing element
Implementation Method 2
The additional sealing element is preferably designed to be elastic
Data Source
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AI summary
The aim of the invention is to provide a piston device (100) that is simply constructed and provides optimized sealing. This aim is achieved in that the piston device comprises the following: a housing (102), which comprises a piston holder; a piston (116), which is arranged in the piston holder (118) in a linearly slidable manner; a main sealing element (132), which separates a first media space (134) from a second media space (136); and an additional sealing element (170) different from the main sealing element for sealing in a region between the piston and the piston holder.