Dispensing Nozzle Suction Timing for Bubble Prevention
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Solution Overview
Problem
Existing dispensing devices face challenges in maintaining high accuracy and preventing air bubbles from jumping out of the nozzle during high-speed movement and deceleration, leading to potential errors in dispensing amounts.
Innovation Solution
The dispensing device initiates liquid suction from the moment the nozzle begins to lower towards the liquid level until it contacts the level and stops, ensuring that suction occurs while the nozzle is decelerating and reducing the likelihood of air bubbles being pushed out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle is lowered at high speed toward the liquid level to improve processing capacity, then productivity is improved, but air bubbles jump out of the nozzle tip causing dispensing errors
Solution Approach 1:
The patent applies preliminary action by starting liquid suction before the nozzle reaches the liquid level. The suction is initiated when the nozzle is at a predetermined position above the liquid level and continues until the nozzle contacts the liquid. This preliminary suction creates negative pressure that prevents air bubbles from jumping out during high-speed deceleration, thus maintaining dispensing accuracy while allowing high approach speeds.
Solution Approach 2:
The patent implements beforehand cushioning by using the liquid itself to cushion the nozzle's deceleration. The nozzle is allowed to contact the liquid at high speed, and the liquid provides a cushioning effect that absorbs the deceleration shock. Combined with the preliminary suction, this prevents air bubbles from being pushed out by inertia during deceleration.
2Loss of time
If the nozzle is decelerated and stopped at high acceleration to restrict immersion range and reduce cleaning time, then loss of time is reduced, but air bubbles jump out of the nozzle causing harmful effects
Solution Approach 1:
The patent applies preliminary action by initiating liquid suction before the nozzle reaches the liquid level. The suction starts when the nozzle is at a predetermined position above the liquid level and continues through the deceleration phase until contact. This creates negative pressure that counteracts the inertial force pushing air bubbles out during high-acceleration deceleration, preventing harmful air bubble ejection while allowing rapid stopping.
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
This approach prevents air from escaping from the nozzle tip, thereby avoiding excessive liquid suction and enhancing dispensing accuracy, even at high speeds.
Implementation Method 1
starts suction of a liquid in a period from when a nozzle starts to be lowered toward a liquid level of the liquid to when an end portion of the nozzle comes into contact with a liquid level of the liquid
Data Source
AI summary
An object of the present invention is to provide a dispensing device capable of preventing bubbles from jumping out of a nozzle and realizing highly accurate dispensing even though the nozzle is moved at a high speed toward a liquid level and is decelerated and stopped at a high acceleration. The dispensing device according to the present invention starts suction of a liquid in a period from when a nozzle starts to be lowered toward a liquid level of the liquid to when an end portion of the nozzle comes into contact with the liquid level of the liquid and the lowering of the nozzle is stopped (see FIG. 6).