Stepped Flange Heat Seal for Metering Pump Assembly
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Solution Overview
Problem
Existing fluid dispensing devices often suffer from erratic fluid volume delivery and leakage issues due to clogged valves and require excessive pressure, with manufacturing processes being time-consuming for producing efficient metering pump assemblies.
Innovation Solution
A fluid dispensing device with a flexible container and metering housing featuring a unidirectional intake and output valve system, where the button and base plate are heat sealed with a stepped flange configuration to reduce manufacturing time and improve fluid delivery precision, and the inclusion of stand-off legs and spring-biasing structures to enhance suction and prevent valve clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single one-way check valve is provided at the exit port to prevent leakage, then leakage is reduced, but the valve becomes partially clogged over time requiring additional pressure
Solution Approach 1:
The single check valve is divided into two separate one-way valves: an intake valve at the container opening and an output valve at the exit port. This segmentation allows each valve to perform its specific function independently, preventing the clogging issue that occurred with a single valve while maintaining leakage prevention.
Solution Approach 2:
A metering chamber is introduced as an intermediary component between the container and the output valve. This chamber allows fluid to be drawn in through the intake valve and then metered out through the output valve, preventing direct exposure of the output valve to the main fluid reservoir and reducing clogging.
2Ease of operation
If excessive pressure is applied to open a clogged valve, then fluid flow is restored, but more fluid material is deposited than desired
Solution Approach 1:
The mechanical valve system is replaced with a metering pump mechanism that uses a plunger and piston to control fluid flow. This mechanical substitution eliminates the need for excessive pressure to open clogged valves, as the plunger directly meters the fluid volume through its displacement, providing precise control over the quantity of fluid deposited.
3Ease of manufacture
If button and base plate are heat sealed together with traditional methods, then assembly is achieved, but manufacturing time is excessive
Solution Approach 1:
The heat sealing process parameters are modified by introducing a stepped flange configuration on the button and corresponding recess in the base plate. This geometric modification reduces the heat seal area and optimizes heat distribution, allowing the sealing process to be completed in less than 4 seconds while maintaining assembly integrity.
4Measurement precision
If valve area is reduced to improve fluid delivery precision, then metering accuracy is improved, but valve clogging becomes more likely
Solution Approach 1:
The valve system is segmented into two separate one-way valves with adequate sizing - the intake valve at the container opening and the output valve at the exit port. This segmentation allows each valve to have sufficient opening area to prevent clogging while the metering chamber provides the precision fluid delivery control.
Solution Approach 2:
The metering chamber serves as an intermediary that decouples the valve sizing from the metering precision. The chamber volume is precisely controlled to ensure accurate fluid delivery, while the valves can be sized independently to prevent clogging without compromising metering accuracy.
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 solution ensures consistent and controlled fluid dispensing with reduced manufacturing time, preventing leakage and clogging, and maintaining structural integrity while enhancing manufacturing efficiency.
Implementation Method 1
the button and base plate are heat sealed with a stepped flange configuration to reduce manufacturing time
Implementation Method 2
A unidirectional intake valve is disposed between the container and the flexible metering housing. A unidirectional output valve is in fluid communication with the flexible metering housing
Implementation Method 3
the inclusion of stand-off legs and spring-biasing structures to enhance suction and prevent valve clogging
Implementation Method 4
When the flexible body is squeezed, the material is urged out under pressure through the valve
Data Source
AI summary
A fluid dispensing device has a container made from a flexible material defining an interior fluid storage region and a flexible metering housing having a metering chamber in fluid communication with the fluid storage region, the flexible metering housing having a button heat sealed to a base plate. A unidirectional intake valve is disposed between the container and the flexible metering housing. A unidirectional output valve is in fluid communication with the flexible metering housing. The button has a stepped flange towards an outer edge of said circular shape and the base plate has a stepped flange corresponding to the stepped flange of the button.