Modular Dosing Piston Sealing for Wear-Stable Metering Pumps
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Solution Overview
Problem
Existing metering pistons in metering pumps suffer from material wear of elastomeric sealing elements, leading to insufficient contact pressure and requiring frequent replacement, lack flexibility in material selection, and necessitate replacing the entire piston for different applications or wear conditions.
Innovation Solution
A modular design with a flexible sealing section on a separate metering element and a preload element in a cavity, allowing independent material selection and detachable replacement of components, ensuring precise contact pressure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric sealing elements are pressed against the inner wall to ensure sealing, then sealing effectiveness is improved, but material wear increases and contact pressure decreases over time
Solution Approach 1:
The sealing system is divided into separate components: a base body, a separately formed metering element with sealing section, and an independent preloading element. This segmentation allows the sealing section to be replaced independently without replacing the entire piston, resolving the contradiction by enabling maintenance of sealing effectiveness while extending overall system service life through component replacement.
Solution Approach 2:
The preloading element is designed to be adjustable and replaceable, allowing dynamic adjustment of contact pressure on the sealing section. This enables maintaining optimal sealing pressure over time by replacing worn preloading elements, thus preserving sealing effectiveness while extending the operational life of the sealing system.
2Adaptability or versatility
If the entire metering piston is replaced to adapt to different applications or material wear, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The metering piston is segmented into a base body and a separately formed metering element that can be independently replaced. This allows adaptation to different applications by replacing only the metering element with appropriate sealing section material or geometry, rather than replacing the entire piston, thus improving adaptability while reducing device complexity and replacement cost.
Solution Approach 2:
The base body is designed as a universal component that can accommodate different metering elements with varying sealing section properties. This multi-functionality allows a single base body to serve multiple applications by simply changing the metering element, improving versatility without increasing overall system complexity.
3Loss of energy
If sealing contact area is reduced to minimize friction, then friction is reduced, but sealing effectiveness may be compromised
Solution Approach 1:
The sealing section is designed with specific local geometric features and material properties optimized for sealing, while the rest of the metering piston maintains properties optimized for low friction. This local differentiation allows the sealing area to provide sufficient sealing pressure where needed while minimizing overall friction, resolving the contradiction between sealing effectiveness and energy loss.
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 flexible adaptation to various applications and extended operational life without replacing the entire piston, maintaining consistent sealing and reducing contamination risks.
Implementation Method 1
an elastic preloading element which can act on the sealing section from within
Implementation Method 2
a preload element in the form of an annular elastomer body, which is arranged in a cavity between the metering element and the base body
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Metering piston (2) for a metering pump with a flexible sealing section (4) forming at least a partial outer surface and an elastic preloading element (14) that can act on the sealing section (4) internally. The flexible sealing section (4) is arranged on a metering element (11) formed separately from a base body (5), and the preloading element (14) is arranged in a cavity (13) formed between the metering element (11) and the base body (5).