Fluid Dispenser Guide Wall Core Withdrawal
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Solution Overview
Problem
The existing molding process for swirl systems in fluid dispenser pumps is complicated and prone to damaging the slide cylinder due to the need to remove a core without damaging the cylindrical surface, making it difficult to manufacture and assemble the differential piston effectively.
Innovation Solution
A fluid dispenser member with a dispensing wall that includes a guide wall with an inside diameter greater than the slide cylinder, allowing the core to be withdrawn without biting into the surface, thus simplifying the molding process and reducing the risk of damage to the slide cylinder, and facilitating the assembly of the differential piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the core is withdrawn from the slide cylinder during molding, then the swirl system can be formed, but the core may bite into and damage the cylindrical surface
Solution Approach 1:
The dispensing wall is segmented into two distinct cylindrical portions: a guide wall portion with larger inside diameter and a slide cylinder portion with smaller inside diameter. This segmentation allows the core to be withdrawn through the larger guide wall portion without damaging the smaller slide cylinder portion, resolving the contradiction between ease of molding and structural integrity.
Solution Approach 2:
Different portions of the dispensing wall are given different local qualities: the guide wall portion has a larger inside diameter to facilitate core withdrawal, while the slide cylinder portion maintains a smaller, precise diameter for piston sealing. This local differentiation allows the core to pass through safely without compromising the slide cylinder's integrity.
2Reliability
If the guide wall inside diameter is greater than the slide cylinder inside diameter, then the core can be withdrawn without damage, but the assembly process becomes more complex
Solution Approach 1:
The guide wall and slide cylinder are merged into a single integrally formed dispensing wall component. Although the inside diameters differ at different portions, both features are created in one molding operation using a single core, eliminating the need for separate manufacturing steps or assembly operations. This merging resolves the contradiction by maintaining structural integrity while avoiding increased assembly complexity.
3Reliability
If the differential piston is assembled after molding, then the slide cylinder can be protected from damage, but manufacturing time increases
Solution Approach 1:
The dispensing wall is pre-formed with the guide wall portion having a larger inside diameter that accommodates the core during molding. This preliminary design feature allows the core to be withdrawn without damage to the slide cylinder, enabling the differential piston to be assembled in the same manufacturing cycle without increasing overall production time. The preliminary action of designing the larger guide wall diameter prevents damage while maintaining productivity.
Data Source
AI summary
A fluid dispenser member having a dispensing wall defining an outside surface and inside surface, the wall being provided with a through dispensing orifice connecting the inside surface to the outside surface. The inside surface forming a leaktight slide cylinder for a piston suitable for moving in leaktight contact inside the cylinder for selectively unmasking the dispensing orifice. The piston forming a wall element of a fluid chamber inside which fluid is selectively put under pressure. The inside surface, at the slide cylinder, forming a fluid swirl system immediately upstream from the dispensing orifice. The dispensing wall is formed by a substantially cylindrical skirt further provided with a guide wall defining an inside surface whose inside diameter is greater than the inside diameter of the slide cylinder.