Rotating Protective Cap Decouples Sealing From Removal Force
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Solution Overview
Problem
Existing liquid dispensers face challenges in maintaining effective sealing while allowing easy removal of the protective cap, leading to potential wear and contamination risks, especially when used for pharmaceutical or cosmetic liquids.
Innovation Solution
A liquid dispenser design featuring a protective cap with a fastening part and an inner part that are rotatable and axially movable, decoupling the sealing point to prevent wear and allowing for easy removal without direct force application, along with a ventilation path and optional sterile filter and absorption pad for contamination prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective cap bears sealingly against the housing to protect the discharge opening, then sealing reliability is improved, but removal becomes difficult due to friction and wear occurs at the sealing point
Solution Approach 1:
The protective cap is divided into two separate components: an inner cap that performs the sealing function and an outer cap that provides mechanical coupling and removal force transmission. This segmentation allows the sealing surface to remain stationary during removal, eliminating wear while maintaining sealing reliability.
Solution Approach 2:
The sealing function is extracted from the outer cap and assigned to the inner cap. The outer cap is taken out from the sealing interaction, allowing it to be designed solely for force transmission and mechanical coupling without wear concerns.
2Productivity
If force is applied directly to remove the protective cap, then removal speed is improved, but wear and damage to the sealing point increases
Solution Approach 1:
The removal force application point is extracted from the sealing surface. The outer cap provides a separate interface for force application through its lateral surface, allowing rapid removal without transmitting wear-inducing forces to the sealing point.
Solution Approach 2:
The inner cap acts as an intermediary between the outer cap and the housing sealing surface. It transmits the removal force from the outer cap while maintaining a stationary sealing interface with the housing, preventing wear during the removal process.
3Device complexity
If the protective cap is designed as a single integrated component, then device complexity is reduced, but functional optimization of different regions is limited
Solution Approach 1:
The cap is segmented into inner and outer components, each optimized for its specific function. The inner cap is optimized for sealing with the housing, while the outer cap is optimized for user interaction and force transmission. This segmentation enables functional optimization without significantly increasing overall complexity.
Solution Approach 2:
Different regions of the cap system are given different properties and functions. The inner cap has sealing-specific properties (sealing surface geometry, material), while the outer cap has user-interface properties (grip surface, removal force transmission). This local quality optimization allows each component to be tailored to its specific role.
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
The design ensures reliable sealing, reduces wear and contamination risks, and simplifies cap removal, while allowing for the use of materials optimized for each function, promoting efficient liquid dispensing and hygiene.
Implementation Method 1
In the fitted state, the inner part surrounds the discharge opening and bears sealingly against the housing or against an actuating pushbutton of the liquid dispenser
Implementation Method 2
the relative movement of the protective cap and the housing is made difficult by the friction prevailing at the sealing point
Implementation Method 3
It may additionally perform further functions, such as in particular ventilation of the discharge opening
Implementation Method 4
absorption of residual liquid at the discharge opening
Data Source
AI summary
A liquid dispenser for dispensing in pharmaceutical liquids via a discharge or dispensing opening protected by a protective cap. The protective cap has a fastening part, designed for coupling to a housing of the liquid dispenser, and an inner part separate from the fastening part. The inner part, when the protective cap is in a fitted state, protects the discharge opening. The inner part is captively coupled to the fastening part by a coupling device, and the inner part is freely rotatable about a longitudinal axis of the protective cap in relation to the fastening part.