Trigger-type dispensing head for a dispensing device for pasty products such as toothpastes
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Solution Overview
Problem
Existing dispensers for pasty products, particularly toothpastes, face challenges in effective dispensing and suction, especially when using plastic materials, which are not adequately addressed by current designs.
Innovation Solution
A dispenser design featuring a plastic container tube, a piston, a dispensing head with a main chamber, and a valve system comprising a suction inlet, intermediate and delivery valves, and a suction valve, allowing for efficient product dispensing and suction phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal stop ring is used to prevent piston recoiling in high-viscosity paste dispensing, then the piston can be restrained effectively, but the dispenser cannot be made fully recyclable plastic and has limited applicability to medium- or low-viscosity pastes
Solution Approach 1:
The invention changes the viscosity parameter range by introducing a check valve mechanism that enables effective piston restraint across a broader viscosity spectrum (from low to high viscosity pastes), rather than being limited to high-viscosity applications only
Solution Approach 2:
The invention extracts the metal stop ring component and replaces it with a check valve mechanism, allowing the piston restraint function to be achieved through fluid dynamic control rather than mechanical blocking, thereby enabling plastic construction and broader viscosity applicability
2Ease of manufacture
If plastic materials are used for all components to improve recyclability, then environmental requirements are met, but effective suction and dispensing performance may be compromised
Solution Approach 1:
The invention introduces a check valve as an intermediary mechanism that mediates between the plastic construction requirements and the performance requirements, enabling effective suction and dispensing through controlled fluid dynamics rather than relying on material properties alone
Solution Approach 2:
The invention uses hydraulic principles through the check valve mechanism to control paste flow during suction and dispensing phases, leveraging fluid pressure and flow characteristics to achieve reliable performance with plastic components
3Reliability
If a complex valve system is implemented to achieve effective suction and dispensing, then product control is improved, but device complexity increases
Solution Approach 1:
The check valve system operates automatically based on pressure differentials during suction and dispensing phases, controlling paste flow without requiring external actuation or complex control mechanisms, thereby maintaining simplicity while achieving reliable product control
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 effective dispensing and suction of pasty products, particularly toothpaste, with minimal waste and environmental impact, utilizing plastic materials that are easily recyclable.
Implementation Method 1
a suction valve (76) allowing the pasty product to be drawn from said tube compartment (6) into said main chamber (20) during a suction phase
Implementation Method 2
an intermediate valve (64) and a delivery valve (71), both in communication with said main chamber (20), allowing the pasty product to pass from said main chamber (20) to said dispensing duct (42) during a dispensing phase, and preventing the pasty product from returning to said main chamber (20) during the dispensing phase
Data Source
AI summary
A dispenser for pasty products having a fixed head that has a dispensing duct for dispensing a product, a pump with an elastically deformable cap, a manually-operated actuator, a separating wall with a suction inlet, and a suction valve cooperating with the suction inlet. The suction valve has a valve body and a plurality of tabs that bend and open the suction inlet in a product suction step, and close the suction inlet in a product dispensing step.