Valved Needle Assembly With Springless Interlocking Valve Fixation
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Solution Overview
Problem
Conventional valved needle assemblies require coil springs to maintain the valve body in a closed state, leading to increased parts and assembly complexity, adhesive leakage, and difficulty in assembly.
Innovation Solution
A valved needle assembly with a novel structure featuring a locking protrusion and inclined guide surface for easy assembly, eliminating the need for a coil spring, and incorporating a disc valve with support structures to stabilize the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil spring is provided to maintain the valve body in a closed state, then the valve body can be stably fixed, but the number of parts and assembly steps increases
Solution Approach 1:
The invention extracts and eliminates the coil spring from the needle assembly structure. Instead of using a separate spring component to maintain valve closure, the patent uses the elastic deformation of the valve body itself (through the resilient portion) to achieve the same function, thereby reducing the number of parts and simplifying assembly
Solution Approach 2:
The invention merges the spring function into the valve body structure by creating a resilient portion that is integral to the valve body. This integration combines the functions of the valve body and the spring into a single component, eliminating the need for separate assembly steps and reducing overall complexity
2Reliability
If a coil spring is provided to maintain the valve body in a closed state, then the valve body can be stably fixed, but the assembly difficulty increases due to urging force
Solution Approach 1:
By removing the coil spring entirely, the invention eliminates the urging force problem that complicates assembly. The resilient portion provides necessary elastic force without creating assembly difficulties associated with pre-compressed springs
Solution Approach 2:
The resilient portion is pre-formed during manufacturing with built-in elastic properties, so no additional assembly steps are needed to install or pre-compress a separate spring. The elastic deformation capability is built into the valve body structure itself before assembly
3Strength
If adhesive is used to fix the needle hub and connection hub, then the components can be joined, but adhesive leaks into the fluid flow path
Solution Approach 1:
The invention removes adhesive from the assembly process entirely by using mechanical interlocking through the locking protrusion and locking groove. This eliminates the harmful effect of adhesive leakage into the fluid path while maintaining strong bonding through the mechanical locking mechanism
4Reliability
If the valve body is fixed against coil spring urging force, then the valve body can be secured, but the number of assembly steps increases
Solution Approach 1:
By eliminating the coil spring, the invention removes the need for assembly steps involving spring installation and compression. The valve body can be directly assembled using the locking protrusion mechanism without dealing with spring urging forces, thereby improving production efficiency
Solution Approach 2:
The locking protrusion and groove are pre-formed during manufacturing, allowing the valve body to be quickly assembled without requiring complex assembly steps to secure it against spring forces. This preliminary preparation of locking features streamlines the assembly process
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
Facilitates easy and firm fixation of the valve body, reducing the number of parts and assembly steps, enhancing production efficiency, and preventing adhesive leakage.
Implementation Method 1
a coil spring in a compressed state is provided on the tip end side of the valve body, so that the coil spring is configured to undergo extension deformation due to expanding deformation of the valve body as described above
Implementation Method 2
by removing the external flow path from the connection hub, the coil spring deforms due to recovering action, closes the slit of the valve body
Data Source
AI summary
A valved needle assembly includes a connector having an inner hole, a pipe body fixed to a tip end of the connector, a valve body, and an assembly part in which an insertion part provided to one of the connector and the pipe body is inserted into another such that the connector is disposed within or about the pipe body. A locking protrusion and a locking part are provided to superposed faces of the connector and the pipe body in the assembly part for preventing the insertion part from dislodgment by mutual lock, and an inclined guide surface for guiding the locking protrusion is formed on a tip end in a direction of assembly of the connector or the pipe body to which the locking part is provided. The valve body is incorporated by being mated with the connector and the pipe body.