Dispensing Cap Venting and Sealing for Inverted Resin Bottles
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Solution Overview
Problem
Existing fluid dispensing systems for 3D printing, particularly those dispensing resin from bottles, face challenges in ensuring reliable sealing and controlled fluid flow, especially when inverted, and in maintaining consistent dispensing rates.
Innovation Solution
A dispensing cap with a sealing assembly and guiding surfaces, biased by springs, allows for controlled fluid and gas flow, ensuring sealing when inverted and regulating fluid dispensing based on tank fill levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the dispensing cap uses a simple opening design for fluid dispensing, then the device complexity is reduced, but the sealing reliability when inverted deteriorates
Solution Approach 1:
The cap body is segmented into multiple functional openings: a first opening for fluid dispensing and a second opening for gas passage. This segmentation allows independent control of fluid and gas flow paths, enabling reliable sealing of the fluid opening while maintaining device simplicity
Solution Approach 2:
A sealing member is introduced as an intermediary element that selectively seals the first opening (fluid opening) while allowing the second opening (gas opening) to remain open. This mediator component enables differential sealing control without complicating the overall cap structure
2Reliability
If the sealing assembly is always sealing the first opening, then fluid leakage is prevented, but fluid dispensing cannot occur
Solution Approach 1:
The sealing member is designed to be dynamically movable along the guide rods between a lowered sealing position and an elevated dispensing position. This dynamic positioning allows the system to switch between sealed and dispensing states, providing both reliable sealing and easy fluid dispensing control
Solution Approach 2:
The spring automatically biases the sealing member to the lowered sealing position, and the system self-regulates fluid flow through the equilibrium between spring force and fluid pressure, eliminating the need for manual control mechanisms
3Extent of automation
If springs are used to bias the sealing assembly, then automatic sealing is achieved, but the device complexity increases
Solution Approach 1:
The guide rods serve multiple functions: they provide structural support for the cap body, guide the movement of the sealing member, and serve as mounting structures for the springs. This multi-functionality reduces overall device complexity while achieving automatic sealing
Solution Approach 2:
The spring biasing mechanism is merged with the guide rod structure, where the springs are coiled about the guide rods themselves. This integration combines the guiding and biasing functions into a single structural element, minimizing additional components
4Productivity
If the first opening is used for fluid dispensing, then fluid flow is enabled, but gas flow into the bottle is blocked
Solution Approach 1:
The cap body is divided into separate first and second openings, creating distinct pathways for fluid and gas flow. This segmentation allows the sealing member to independently control each flow type, enabling simultaneous fluid dispensing and gas venting without interference
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 system maintains a sealed condition during inversion and self-regulates fluid flow to match tank fill levels, preventing leaks and ensuring consistent dispensing.
Implementation Method 1
Respective springs coiled about each of the guide rods may bias the sealing assembly toward the first opening. More specifically, the expansion of the springs causes the ring members to be translated downwards along the respective guide rods
Implementation Method 2
In the first (lowered) position, the sealing assembly seals the first opening and stops a flow of the gas through the second opening
Implementation Method 3
the flow of fluid from the fluid container (i.e., through the first opening of the cap body) may create a partial vacuum within the fluid container which partially impedes the flow of additional fluid from the fluid container into the tank
Implementation Method 4
Intermittently, gas may flow into the fluid container (i.e., through the second opening of the cap body), reducing the partial vacuum within the fluid container and allowing additional fluid to flow into the tank
Data Source
AI summary
A dispensing cap may include a cap body and a sealing assembly. The cap body may include a first opening, a second opening distinct from the first opening, and one or more guiding surfaces. The first opening may be configured to dispense a fluid (e.g., a liquid), and the second opening may be configured to pass a gas. The sealing assembly may be slidably attached to the one or more guiding surfaces of the cap body and may be translatable between a first position and a second position. In the first position, the sealing assembly seals the first opening and stops a flow of the gas through the second opening. In the second position, the sealing assembly does not seal the first opening and does not stop the flow of the gas through the second opening.