Dual Dispensing Apparatus Guide Elements Seal Integrity
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Solution Overview
Problem
Dual dispensing apparatus with pistons molded to plungers face issues with seal integrity due to bending and torsional moments, leading to unwanted leaks when dispensing two-component systems.
Innovation Solution
Incorporation of guide elements, such as grooves and webs, to engage mutually and redirect bending and torsional moments into the storage chamber wall, reducing piston tilts and enhancing the seal between the piston and the chamber wall, along with a bayonet connection for precise orientation and a closure cap for secure storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pistons are molded to the plungers, then the device complexity is reduced and ease of manufacture is improved, but bending and torsional moments cause piston tilts and seal failure
Solution Approach 1:
The storage chamber is divided into two separate chambers with individual guide elements, allowing each piston-plunger assembly to be guided independently. This segmentation enables each chamber to handle bending and torsional moments separately, preventing piston tilt while maintaining the integrated molding approach
Solution Approach 2:
Guide elements act as intermediary components between the piston-plunger assembly and the storage chamber wall. These guide elements transfer and distribute the bending and torsional moments, preventing direct transmission of harmful forces to the piston-seal interface
2Reliability
If guide elements are added to reduce piston tilts, then the seal reliability is improved, but the device complexity increases
Solution Approach 1:
The guide elements are merged with either the storage chamber wall or the plunger body through integral forming. This combining approach adds guidance functionality without requiring separate assembly steps or additional components, thus improving reliability while minimizing complexity increase
Data Source
AI summary
A dual dispensing apparatus for dispensing two flowable components having a first storage chamber for the first component, and a second storage chamber for the second component. The two storage chambers are arranged next to one another and each have an outlet for the first or the second component respectively at their distal ends. The apparatus also has a first plunger for penetrating into the first storage chamber and a second plunger for penetrating into the second storage chamber. A respective piston for dispensing the respective component is molded to each plunger and is sealingly guided by the respective wall of the storage chamber. Each storage chamber has at least one first guide element at its end remote from the outlet and each plunger has at least one second guide element adjacent to the respective piston. The first and the second guide elements are configured for mutual engagement.