Coaxial Control Dual Nozzle for Precise Needle Alignment

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Solution Overview

Problem

Conventional coaxial dual nozzles face challenges in precisely controlling and maintaining the central axis of hollow tube needles, especially when the gap between the inner and outer needles is less than 0.1 mm, leading to distortion and difficulty in replacing the inner needle without disrupting the central axis.

Innovation Solution

A coaxial control dual nozzle design featuring an inner nozzle body, an outer nozzle body, an inner needle positioning unit, and an outer needle positioning unit, which includes a metal plate and central axis adjusting screw pins to precisely control and maintain the central axis of the hollow tube needles coaxially or non-coaxially, along with a pneumatic controller for managing the flow of solutions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the gap between the hollow tube needles is reduced to 0.1 mm or less, then the manufacturing precision of core-shell structures is improved, but the inner needle becomes distorted non-coaxially and difficult to replace

Engineering Contradiction:

Improvecoaxial alignment precisionVSAvoidneedle replacement ease

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The device is divided into separate inner needle and outer needle components that can be independently assembled and replaced. The inner needle can be detached and replaced without affecting the outer needle, solving the replacement difficulty while maintaining precise coaxial alignment through the positioning unit

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A positioning unit with a metal plate and adjusting screw pins acts as an intermediary mechanism between the inner and outer needles. This intermediary structure provides reference points and adjustment capabilities that maintain coaxial alignment during needle replacement, resolving the contradiction between small gap precision and replacement ease

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If the gap between the hollow tube needles is reduced to 0.1 mm or less, then the manufacturing precision of core-shell structures is improved, but the inner needle contacts the outer needle causing non-coaxial distortion

Engineering Contradiction:

Improvecoaxial alignment precisionVSAvoidcentral axis stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The positioning unit with metal plate and adjusting screw pins is pre-configured to establish the correct coaxial alignment before the inner needle is inserted. This preliminary positioning prevents contact-induced distortion by ensuring proper spacing and alignment are established in advance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mechanical adjustment mechanism replaces manual coaxial alignment procedures. The adjusting screw pins provide precise mechanical control over the inner needle's position, replacing reliance on operator skill and ensuring consistent coaxial alignment that maintains central axis stability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If conventional dual nozzle structure is used, then the device complexity is reduced, but the control precision of central axis position is insufficient

Engineering Contradiction:

Improvenozzle structure complexityVSAvoidcentral axis position control precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The metal plate with through-holes and adjusting screw pins serve as intermediary elements that provide a reference framework for positioning the inner needle. This intermediary structure enables precise control of the central axis position without requiring complex overall nozzle design

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The adjusting screw pins enable precise adjustment of the inner needle's position by changing its spatial parameters. This allows fine-tuning of the central axis position control with simple mechanical adjustments rather than complex structural modifications

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11458497B2Coaxial control dual nozzle

Publication Date: 2022.10.04 PARK JONG SU

AI summary

Disclosed is a coaxial control dual nozzle, which includes an inner nozzle body having an injection port through which a first fluid is injected; an inner needle connected to the inner nozzle body and having a hollow tube needle configured to provide a discharge port for the first fluid; an outer nozzle body assembled with the inner nozzle body and having an injection port through which a second fluid is injected; an outer needle connected to the outer nozzle body and disposed to surround the hollow tube needle provided to the inner needle, the outer needle having a hollow tube needle configured to provide a discharge port for the second fluid; an inner needle positioning unit configured to control a location of a central axis of the hollow tube needle provided to the inner needle; and an outer needle positioning unit configured to control a location of a central axis of the hollow tube needle provided to the outer needle.