One-Piece Pump Assembly for Metered Fluid Dispensing
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Solution Overview
Problem
Existing fluid dispensing devices are prone to erratic fluid volume delivery and leakage due to complex configurations and multiple parts, which can lead to inconsistent dispensing and accidental fluid release.
Innovation Solution
A simplified, one-piece dispensing device with an integrated dome button, top portion extension, and flapper valve that forms a one-way exit valve, preventing accidental dispensing and leakage by using a spring-biased valve and stand-off legs to ensure controlled metering and automatic shut-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate parts (dome button, intake valve, output valve) are used in the metering pump assembly, then the dispensing function is more reliable and controllable, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent combines the dome button, intake valve, output valve, and metering chamber into a single integrated one-piece pump assembly. This merging of previously separate components maintains the reliable metered dispensing function while reducing device complexity and the number of parts that need to be assembled and sealed.
Solution Approach 2:
The one-piece pump assembly performs multiple functions simultaneously: the dome button provides both the actuation force and forms part of the metering chamber, while the flapper valve structure serves as both an intake valve and an automatic shut-off mechanism. This multi-functionality reduces the need for separate dedicated components.
2Reliability
If multiple separate parts are used in the metering pump assembly, then the valving functions are more reliable, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent integrates multiple valving functions into a single molded one-piece assembly. The flapper valve is formed as an integral part of the pump assembly, eliminating the need for separate valve components and their associated sealing requirements. This integration maintains reliable valving while significantly simplifying manufacturing and reducing assembly steps.
3Object-affected harmful factors
If a single one-way check valve is used at the exit port, then leakage is prevented, but the valve becomes clogged over time requiring additional pressure to open
Solution Approach 1:
The patent divides the single check valve function into two separate flapper valves: an intake flapper valve that opens to allow fluid entry into the metering chamber, and an output flapper valve that opens to allow metered fluid discharge. This segmentation prevents clogging issues because each valve handles only one direction of flow and can be designed with appropriate clearances and opening forces.
Solution Approach 2:
The flapper valves are designed to dynamically open and close based on pressure differential and spring force. The spring bias allows the valves to remain closed under normal conditions (preventing leakage) but opens them when sufficient pressure is applied during actuation (enabling flow). This dynamic behavior maintains reliable operation over time.
4Productivity
If the flexible container is squeezed to deliver fluid, then the fluid delivery speed increases, but the fluid volume becomes erratic and leakage occurs
Solution Approach 1:
The pump assembly pre-meters the fluid volume in the dome-shaped metering chamber before discharge. Each actuation cycle fills the chamber with a precise volume determined by the chamber geometry, ensuring consistent dispensing regardless of the squeezing force applied. The preliminary metering action eliminates volume variability.
Solution Approach 2:
The pump operates in periodic cycles: the intake flapper valve opens during the upstroke to fill the metering chamber, then closes, and the output flapper valve opens during the downstroke to discharge the metered volume, then closes. This periodic operation ensures that each dispensing event delivers a consistent predetermined volume.
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 provides consistent, controlled metered delivery of fluid with reduced manufacturing complexity and cost, while preventing accidental dispensing and leakage, making it suitable for various applications across industries.
Implementation Method 1
a first spring-biased flapper valve integrally formed with the one-piece pump assembly
Implementation Method 2
A vacuum action created by depressing the dome button draws a predetermined volume of fluid material into the metering chamber through the intake valve
Data Source
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AI summary
A liquid dispensing device includes a storage container having an opening and dome pump assembly attached thereto substantially over the opening for metered dispensing. The dome pump assembly is integrally formed with a dome button, top portion extension and valve to facilitate manufacture and reduce costs of the pump while improving performance thereof. The valve is employed to pull liquid from the storage container into the dome for metering. An exit passageway formed from the extension and container wall serves as an output valve. The user squeezes the dome and the opposite side of the container pouch concurrently to seal the flapper valve to urge liquid out through the exit passageway for actual dispensing.