Pre-compression Valve Snap-fit Retention for Trigger Dispensers
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Solution Overview
Problem
The assembly of the pre-compression valve to the frame in manual trigger dispenser devices is challenging due to the high pressure required, which demands a secure and effective retention mechanism to prevent valve instability and ensure proper pressure chamber operation.
Innovation Solution
The dispenser device incorporates a pre-compression valve with integrated retaining means, such as a deformable membrane and annular attachment walls, made of rigid plastic material, which snap-engages with the frame to securely attach the valve and withstand the pressure without requiring additional components or complex assembly processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking element is used to retain the pre-compression valve to the frame, then the valve retention is effective, but the device complexity increases due to additional components
Solution Approach 1:
The retaining means are integrated directly into the pre-compression valve structure, merging the valve body and retention features into a single component. This eliminates the need for separate locking elements while maintaining effective valve retention against the 10 bar pressure (12 kg force).
Solution Approach 2:
The pre-compression valve incorporates self-retaining features that automatically secure it to the frame without requiring additional assembly components. The valve's own structure provides the retention mechanism, simplifying both the component count and assembly process.
2Reliability
If the pre-compression valve is held by compressing the valve sleeve inside the seat, then the valve retention is effective, but the assembly process becomes complex and requires careful implementation
Solution Approach 1:
The pre-compression valve is designed with distinct functional segments: a deformable membrane for pressure sensing and an annular attachment wall for retention. This segmentation allows the retention feature to be clearly defined and easily assembled without complex compression steps.
Solution Approach 2:
The attachment wall is designed with specific geometric parameters (annular shape, protrusion dimensions) that enable simple snap-fit assembly. The deformable membrane's elasticity parameter allows it to deform during assembly and then lock into position, transforming a complex compression assembly into a simple snap-in operation.
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 design simplifies the connection of the pre-compression valve to the frame, ensuring stable operation under high pressure while maintaining ease of assembly and functionality, thus overcoming the assembly challenges faced in prior art solutions.
Implementation Method 1
a pressure of 10 bar can be reached in the pressure chamber, which is equivalent, for the usual dimensions of such devices, to an action of about 12 Kilograms on the valve
Implementation Method 2
made of rigid plastic material
Data Source
AI summary
A dispenser head (10) of a trigger dispenser device includes a self-bearing pre-compression valve (80), made of polypropylene, capable of per se retaining in a stable manner to the head frame (14″).