Press Pump Spring Tube Design for Cost Reduction
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Solution Overview
Problem
Existing press pumps for dispensing alcohol and mouthwash require large, expensive springs with thick wires and long lengths to achieve sufficient displacement, leading to high manufacturing costs and potential contamination of the product due to direct contact between the spring and the liquid.
Innovation Solution
A press pump design that incorporates a spring tube to house the spring internally, reducing its size and material requirements while isolating it from the product, thereby lowering costs and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an externally disposed spring is used around the piston rod, then the pump capacity can be increased, but the spring size, wire diameter, and length must be large, increasing manufacturing cost
Solution Approach 1:
The spring is placed inside the piston rod hollow cavity, nesting one component within another. This allows the spring to be contained within the existing structural space of the piston rod rather than requiring external space, enabling compact design while maintaining pump capacity.
Solution Approach 2:
The spring arrangement transitions from external radial placement to internal axial placement within the piston rod. This dimensional reconfiguration allows the spring to utilize the internal volume of the piston rod, reducing overall device size and material requirements.
2Force
If an externally disposed spring is used, then the spring force can be sufficient, but the spring will contact the product, causing corrosion or contamination
Solution Approach 1:
The spring is extracted from the external environment and relocated to the internal hollow cavity of the piston rod. This separation removes the spring from contact with the liquid product, eliminating the harmful interaction between the spring material and the product.
Solution Approach 2:
The piston rod hollow cavity serves as an intermediary barrier between the spring and the liquid product. The piston rod structure itself acts as a protective enclosure, allowing the spring to function while preventing direct contact with the product.
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 internal spring design allows for reduced spring size and material usage, lowering manufacturing costs and preventing contact between the spring and the product, thus maintaining product integrity and reducing contamination risks.
Implementation Method 1
a spring contained within the spring tube... so that the spring applies a upward bias force on the press head
Data Source
Figure 1a~1b
Figure 2~3
Figure 4a~5
AI summary
A press pump (1) comprises a press pump body (10) in which a spring tube (20) is provided, a spring (21) is contained within the spring tube (20); a cylinder head (30) mounted on the press pump body (10) and including a internal bore (31); a press head (40) including a pressing portion (41) and a rod portion (42), the rod portion (42) is fit within the internal bore (31) of the cylinder head (30), and a lower portion of the rod (42) engages with the spring (21), so that the spring (21) applies an upward bias force on the press head (40); and a piston (50) connected to the press head (40) and is slidably and sealingly engaged with the internal circumference of the press pump body (10). The press pump (1) can use a spring (21) with relatively small size, while meet the requirement of large displacement, thus reducing manufacturing cost, and also can prevent contact between the product and the spring (21), avoiding negative effects between them.