Telescopic Bell Piston for Pump Fluid Control
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Solution Overview
Problem
Existing piston pumps face issues with fluid dispensing, including dripping and stringing due to residual fluid at the nozzle, which can lead to obstruction and inefficient flow, and are difficult to manufacture, requiring complex stepped chambers or disc mechanisms.
Innovation Solution
A piston pump design featuring a piston with a variable axial length compartment formed by a resilient tubular intermediate portion between the piston head and base, allowing for axial deflection and fluid flow control through radially extending discs and openings, facilitating fluid withdrawal and dispensing while minimizing dripping and stringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stepped chamber is used to achieve fluid withdrawal during charging stroke, then fluid flow control is improved, but device complexity increases
Solution Approach 1:
The piston intermediate portion is designed as a resilient member that dynamically changes its axial length during operation. This dynamic structural change enables the piston to perform both dispensing and fluid withdrawal functions within a single uniform chamber, eliminating the need for complex stepped chamber configurations while maintaining effective fluid flow control.
2Manufacturing precision
If disc mechanisms are added to control fluid flow, then fluid dispensing precision is improved, but manufacturing difficulty increases
Solution Approach 1:
The invention merges the fluid control function previously requiring separate disc mechanisms into the piston structure itself. The resilient intermediate portion with integrated openings performs both structural support and fluid flow regulation functions, simplifying manufacturing while maintaining precise control over fluid dispensing and withdrawal operations.
3Ease of manufacture
If piston length is fixed, then manufacturing is simplified, but fluid withdrawal capability is reduced
Solution Approach 1:
The piston intermediate portion is designed with resilient properties that allow its axial length parameter to change dynamically during operation. This enables the piston to achieve both compact configuration for manufacturing simplicity and extended configuration for effective fluid withdrawal, resolving the contradiction between fixed-length manufacturing advantages and variable-length functional advantages.
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 enhances fluid dispensing efficiency by reducing dripping and stringing, simplifying manufacturing, and providing a valving mechanism that controls fluid flow effectively, making it suitable for various fluid types and applications.
Implementation Method 1
the tubular member being resilient having an inherent bias to assume an initial unbiased configuration of an unbiased length measured axially along the central axis, the tubular member resiliently deflectable to biased configurations each having a length measured axially along the central axis less than the unbiased length
Data Source
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AI summary
A piston pump dispenser in which a volume in a compartment defined inside a piston chamber-forming member and between axially spaced discs (48, 50) on a piston varies with movement of the piston in a cycle of operation due to the piston having a tubular portion (200, 45) between the discs which varies in axial length. The tubular portion (200) has a circumferentially extending wall in the shape of a solid of revolution about an axis of the piston with opening (212) through the wall for fluid flow. The tubular portion acts as a spring to axially bias the axially spaced disc apart.