Syringe Sprayer Nozzle Packing Compression Seal
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Solution Overview
Problem
Syringe-shaped spraying devices face issues with liquid leakage and nozzle detachment due to insufficient connection between the barrel and nozzle under high pressure, leading to potential nozzle displacement and inaccurate liquid administration.
Innovation Solution
A syringe-shaped spraying device design featuring a barrel, plunger, gasket, nozzle, packing, and core, where the nozzle is connected to the barrel using a packing with annular recess and protrusion features, ensuring a secure, liquid-tight connection by compressing the packing between the barrel and nozzle surfaces, and providing additional radial support with a second annular protrusion to prevent looseness and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the connection between barrel and nozzle is simplified, then device complexity is reduced, but liquid-tightness and firmness under high pressure deteriorate
Solution Approach 1:
The connection structure is divided into multiple functional elements: an annular groove in the barrel, an annular packing member, and an annular protrusion in the nozzle. This segmentation allows each component to perform a specific function (sealing, compression, mechanical interlocking) while maintaining overall simplicity.
Solution Approach 2:
The annular packing member serves as an intermediary element between the barrel and nozzle. It is compressed by the annular protrusion against the annular groove to create a liquid-tight seal, mediating the connection between the two main components without requiring complex threading or welding.
2Device complexity
If the connection between barrel and nozzle is simplified, then device complexity is reduced, but firmness against nozzle detachment deteriorates
Solution Approach 1:
The connection strength is achieved through segmented mechanical features: the annular groove provides a recess for the packing, the packing member provides friction and sealing, and the annular protrusion provides mechanical interlocking. This segmentation achieves strong connection without complex overall structure.
Solution Approach 2:
The annular groove and annular protrusion utilize curved geometries that distribute stress evenly around the circumference of the connection. This curved design enhances the mechanical interlocking and prevents stress concentration that would lead to detachment.
3Reliability
If packing compression is increased to improve sealing, then liquid-tightness improves, but radial support and prevention of looseness deteriorates
Solution Approach 1:
The sealing function and radial support function are segmented into different components: the compressed packing member provides the liquid-tight seal through axial compression, while the annular protrusion provides radial support and prevents looseness through its rigid mechanical interlocking structure.
Solution Approach 2:
The annular protrusion acts as an intermediary that transfers radial support forces from the nozzle to the barrel, independent of the axial compression force applied to the packing. This separates the sealing mechanism from the radial stabilization mechanism.
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 design ensures a firm and liquid-tight connection between the nozzle and barrel, preventing leakage and nozzle displacement, even under increased pressure, allowing for accurate and reliable liquid administration without increasing manufacturing costs.
Implementation Method 1
the packing is compressed in an axial direction due to the packing being sandwiched between the front end surface of the connecting portion and the first facing surface
Implementation Method 2
By engaging the first annular protrusion portion with the annular recess portion
Implementation Method 3
The second annular protrusion portion is in pressure contact with the outer circumferential surface of the connecting portion entirely in the circumferential direction of the connecting portion
Data Source
AI summary
A syringe-shaped spraying device includes: a barrel; a nozzle; a packing disposed therebetween; and a core disposed inside the nozzle. The nozzle is connected to a connecting portion provided at a front end of the barrel. The nozzle has a first facing surface facing a front end surface of the connecting portion and a second facing surface facing an outer circumferential surface of the connecting portion. The outer circumferential surface is provided with an annular recess portion, and the second facing surface is provided with a first annular protrusion portion and a second annular protrusion portion. By engaging the first annular protrusion portion with the annular recess portion, the packing is compressed in an axial direction by the front end surface and the first facing surface. The second annular protrusion portion is in pressure contact with the outer circumferential surface of the connecting portion entirely in a circumferential direction.