Two-Stage Dispensing Unit With Independent Piston Lift Control
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Solution Overview
Problem
Existing dispensing units lack the ability to independently adjust the air lift distance and fluid intake lift distance, limiting the control over the size of dispensed dots of viscous material.
Innovation Solution
A dispensing unit with a two-part reciprocating piston assembly, comprising a fluidic piston and an air lift piston, allows for independent adjustment of the air lift distance and fluid intake lift distance, enabling precise control over the kinetic energy and volume of material dispensed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single piston is used to drive material dispensing, then the structure is simple, but the air lift distance and fluid intake lift distance cannot be independently adjusted
Solution Approach 1:
The single piston is divided into two separate pistons: a first piston that controls fluid intake lift distance and a second piston that controls air lift distance. This segmentation allows independent adjustment of each distance parameter, resolving the contradiction between adaptability and structural simplicity.
2Manufacturing precision
If the air lift distance is increased to jet smaller dots, then the kinetic energy increases, but the fluid intake lift distance also increases resulting in larger dot size
Solution Approach 1:
By segmenting the piston into two independent components, the system can independently control air lift distance (affecting kinetic energy) and fluid intake lift distance (affecting material volume). This enables precise dot size control without the coupled trade-off present in single-piston systems.
Solution Approach 2:
The invention changes the system parameters by introducing two independent distance parameters (air lift distance and fluid intake lift distance) instead of one coupled parameter. This allows optimization of both kinetic energy and material volume separately to achieve precise dot size control.
3Manufacturing precision
If a single piston system is used, then the device is easier to operate, but the control over dispensed dot characteristics is limited
Solution Approach 1:
The control system is segmented into two independent adjustment mechanisms: one for air lift distance and one for fluid intake lift distance. While this increases adjustment parameters, each parameter controls a specific aspect of dot formation, making the overall control more precise and manageable despite the additional degree of freedom.
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 the dispensing unit to produce smaller and more precise dots of viscous material by optimizing the air lift and fluid intake lift distances, enhancing the ability to jet smaller sized dots with higher kinetic energy.
Implementation Method 1
a first piston portion having a lower end configured to pressurize fluid within the orifice of the nozzle
Implementation Method 2
a second piston portion that is separate from the first piston portion and having an upper end configured to engage the actuator, and wherein the first piston portion is configured to move a first distance and the second piston portion is configured to move a second distance
Data Source
Figure 1~2B
Figure 3
Figure 4
AI summary
A dispensing unit includes a main housing having a main chamber, a reciprocating piston, a nozzle, and an adjuster assembly. The adjuster assembly includes an adjuster housing having an adjuster chamber co-axial with the main chamber. The adjuster assembly further includes an actuator disposed in the adjuster chamber and axially movable within the adjuster chamber. The actuator is configured to engage the reciprocating piston assembly and to drive the downward movement of the reciprocating piston assembly. The reciprocating piston assembly includes a first piston portion having a lower end configured to pressurize fluid within an orifice of the nozzle and a second piston portion that is separate from the first piston portion and having an upper end configured to engage the actuator. The first piston portion is configured to move a first distance and the second piston portion is configured to move a second distance.