Dispenser Piston Submersion for Accurate High-Speed Liquid Volume Control
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Solution Overview
Problem
Existing dispensers face inefficiencies in dispensing operations due to air layers formed between the piston and liquid surface, which hinder accurate dispensing rates, especially when increasing piston lowering speed for improved work efficiency.
Innovation Solution
A dispenser design where the piston is always submerged in liquid during operations, eliminating air layers by using a dispensing cylinder with a smaller diameter and a sealing section that prevents air from entering, ensuring accurate volume dispensing regardless of piston speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piston lowering speed is increased to improve work efficiency, then productivity is improved, but manufacturing precision deteriorates due to air layer compression causing inaccurate dispensing rates
Solution Approach 1:
The invention extracts and removes the air layer from the system by extending the piston rod so that the piston remains submerged in liquid throughout the entire dispensing cycle. This eliminates the air cushion effect that causes compression and volume variation, allowing high-speed operation without sacrificing dispensing accuracy.
Solution Approach 2:
The piston is preliminarily positioned to extend below the liquid surface before dispensing begins. This preliminary action ensures that no air layer can form during operation, preemptively preventing the compression problem that would otherwise limit dispensing speed and accuracy.
2Loss of time
If the piston lowering speed is increased, then time for dispensing operations is reduced, but measurement precision deteriorates because the air layer compression makes it impossible to obtain accurate dispensing rates
Solution Approach 1:
By removing the air layer through extended piston rod design, the system eliminates the compressible medium that prevents accurate measurement. This allows direct correlation between piston displacement and liquid dispensed, enabling precise measurement even at high speeds.
Solution Approach 2:
The extended piston rod acts as an intermediary that maintains direct mechanical coupling between the drive mechanism and the liquid, eliminating the air layer intermediary that causes measurement errors. This ensures faithful transmission of displacement information for accurate measurement.
3Device complexity
If a conventional syringe structure is used, then device complexity is reduced, but object-generated harmful factors increase due to air pool formation interfering with accurate dispensing
Solution Approach 1:
The harmful air layer is extracted and removed from the system by designing the piston rod to extend below the liquid surface. This simple structural modification eliminates the air cushion problem without adding complex components or mechanisms.
Solution Approach 2:
The invention changes the geometric parameter of the piston rod length, extending it beyond the conventional design. This parameter change transforms the system from one that generates air layers to one that maintains continuous liquid contact, eliminating the harmful effect.
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
Enables accurate and efficient dispensing of liquids, maintaining precise control over the dispensing rate even at increased piston speeds, improving work efficiency and minimizing the time required for dispensing operations.
Implementation Method 1
a piston (41) inserted from an inner space of a cylinder body section (40a) into a dispensing cylinder section (40b) with a smaller diameter and capable of moving up and down in a range from a dispensing start position in an upper portion of the dispensing cylinder to a dispensing end position in a lower portion of the dispensing cylinder
Data Source
AI summary
The dispenser includes a dispensing head extending downward from a cylinder body section with a cylindrical inner space and having a dispensing cylinder with the diameter smaller than that of the inner space of the cylinder body section; a piston capable of being inserted from the inner space of the cylinder body section into the dispensing cylinder section and moving up and down between a dispensing start position located in an upper portion of the dispensing cylinder section and a dispensing end position in a lower portion of the dispensing cylinder section; and a sucking mechanism sucking a liquid from a dripping port at a tip of the dispensing cylinder section up to a position above the dispensing start position inside the inner space of the cylinder body section. The piston is always at the dispensing start position under a liquid surface whenever the dispensing operation is started.