Dispensing Pump Needle Valve Segmentation for Tightness
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Solution Overview
Problem
Existing pumps for dispensing air-sensitive and mechanically stressed liquids, such as those containing solvents that evaporate quickly or photosensitive substances, face challenges in maintaining tightness and preventing degradation, while also being suitable for viscous liquids and compact bottle sizes.
Innovation Solution
A pump design featuring a band secured to the bottle with a push button and metering sleeve, a reversible valve, and a separate needle for ejection orifice closure, optimized for minimal pressurization and air-tight operation, using elastic return means and a compact, modular structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pump design is used to dispense air-sensitive liquids, then the liquid can be distributed, but the tightness of the closure is insufficient allowing air contact and liquid degradation
Solution Approach 1:
The pump is divided into distinct functional segments: a closure element that seals the ejection orifice, a metering piston with integrated valve, and a needle mechanism. This segmentation allows each component to perform its specific function optimally while maintaining overall system tightness without excessive complexity.
Solution Approach 2:
The metering piston incorporates both the metering function and the valve function in a single integrated component. The piston itself acts as the valve when in the closed position, merging two functions into one element to reduce overall device complexity while maintaining reliable closure.
2Productivity
If high pressurization is applied during liquid distribution, then viscous liquids can be dispensed, but mechanically sensitive liquids undergo physicochemical transformation
Solution Approach 1:
The pump employs a dynamic metering chamber volume that changes during operation. The chamber expands during the suction phase and contracts during the ejection phase, allowing liquid to be drawn in and expelled without requiring high continuous pressurization. This dynamic volume change enables dispensing of viscous and mechanically sensitive liquids with minimal stress.
Solution Approach 2:
The pump operates through periodic cycles of suction and ejection driven by the reciprocating metering piston. During the suction stroke, the chamber expands to draw liquid in; during the ejection stroke, the chamber contracts to expel the liquid. This periodic action allows efficient dispensing without sustained high pressure that would damage sensitive liquids.
3Ease of manufacture
If the pump structure is simplified for easier production, then manufacturing cost decreases, but the tightness of closure deteriorates
Solution Approach 1:
The metering piston serves multiple functions simultaneously: it acts as a plunger to move liquid, a valve to seal the communication orifice, and a metering element to control dose volume. This multi-functionality reduces the number of separate components needed, simplifying production while maintaining reliable closure through the piston's integrated valve function.
Solution Approach 2:
The needle is automatically positioned and actuated by the interaction between the metering piston and the pump housing during the metering piston's movement. The piston's motion directly drives the needle to open or close the ejection orifice, eliminating the need for separate actuation mechanisms and simplifying the overall structure while ensuring reliable operation.
4Volume of moving object
If a compact pump design is used for small bottles, then the pump fits reduced diameter bottles, but the mechanism for needle displacement becomes more complex
Solution Approach 1:
The needle displacement mechanism is merged with the metering piston assembly. The needle is mounted on the metering piston and is directly actuated by the piston's movement and its interaction with the pump housing. This integration eliminates the need for separate displacement mechanisms, achieving compact dimensions without excessive complexity.
Solution Approach 2:
The needle is automatically positioned and actuated by the interaction between the metering piston and the pump housing during the metering piston's movement. The piston's motion directly drives the needle to open or close the ejection orifice, eliminating the need for separate actuation mechanisms and simplifying the overall structure while ensuring reliable operation.
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 effective dispensing of air-sensitive and viscous liquids with improved tightness, reduced pressurization, and simplified production, making it suitable for small bottles and liquids prone to mechanical stress.
Implementation Method 1
a push button (8) comprising an orifice (9) for ejection of the liquid, said push button being mounted on said hoop (2) in translation constrained by an elastic return means
Data Source
Figure 1a~1b
Figure 2~3
Figure 4~5
AI summary
The pump has a frame (2) connected to a bottle and comprising an orifice (3) that communicates with a liquid product contained in the bottle. A needle valve (25) closes a liquid ejecting orifice (9) of an actuator (8), and is separated from a dosing sleeve (11) by a reversible displacement device. A dosing piston (16) having a liquid dispensing channel (17) is mounted in the frame. The displacement device displaces the valve between closing and ejecting positions, and is actuated by interference between the sleeve and the piston during displacement of the actuator on the frame.