Valved Needle Assembly With Springless Locking Valve Structure
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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 tubular support parts for stable fixation.
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 can be stably closed when the external flow path is removed, but the number of parts increases, assembly complexity increases, and the size of the needle assembly increases
Solution Approach 1:
The patent removes the coil spring from the needle assembly structure. Instead of using a spring mechanism, the valve body is designed with elastic properties to automatically return to its closed position. This extraction of the spring component directly reduces the number of parts and assembly complexity while maintaining the valve closing function through the elastic deformation and recovery of the valve body itself.
Solution Approach 2:
The valve body is designed to be self-actuating through its own elastic properties. When the external flow path is connected, the pusher opens the valve; when removed, the valve body's elasticity automatically closes it without requiring an external spring or additional actuating mechanism. This self-service approach eliminates the need for separate spring components and simplifies the overall structure.
2Reliability
If a coil spring is provided to maintain the valve body in a closed state, then the valve can be stably closed when the external flow path is removed, but the number of assembling steps increases
Solution Approach 1:
By removing the coil spring and its associated mounting steps, the assembly process is simplified. The valve body is integrated directly into the needle hub structure, eliminating multiple assembly steps for spring installation, positioning, and securing. This reduces manufacturing complexity while maintaining reliable valve closure through the elastic properties of the integrated valve body.
3Stability of the object's composition
If adhesive is used to fix the needle hub and connection hub, then the components can be fixed together, but the adhesive may leak into the fluid flow path
Solution Approach 1:
The patent replaces adhesive bonding with a mechanical locking mechanism consisting of locking protrusions and locking grooves. This mechanical system provides stable fixation of the needle hub and connection hub without requiring adhesives that could leak into the fluid path. The interlocking mechanical structure ensures component stability while eliminating the harmful effect of adhesive contamination.
4Ease of manufacture
If a locking protrusion and locking groove structure is introduced for assembly, then the connector and pipe body can be firmly fixed with simple assembly, but additional structural elements are added
Solution Approach 1:
The locking protrusions and locking grooves are integrated directly into the existing connector and pipe body structures rather than being separate components. The locking features are formed as part of the molding or machining of these components, merging the locking function with the structural elements themselves. This approach provides firm fixation with simple assembly while avoiding the addition of separate locking components that would increase overall device complexity.
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.