Valve Stem and Core Assembly with Elastic Adjustment
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Solution Overview
Problem
Existing valve designs require high machining precision to achieve good closing performance, leading to increased costs and potential issues like evaporation, leakage, and equipment corrosion, especially in high-demand industries like petrochemicals and nuclear energy.
Innovation Solution
A valve stem and valve core assembly that includes an adjusting device sleeving the valve stem and an elastic element between the adjusting device and the valve core, allowing for relative movement and flexible fitting without the need for high precision machining, using grooves and convex/concave parts for concentric fitting and axial/radial clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed connection methods (threads or other manners) are used to connect the valve stem and valve core, then the structural simplicity is improved, but the closing performance deteriorates due to inability to achieve precise fitting
Solution Approach 1:
The patent transforms the fixed connection between valve stem and valve core into a dynamic adjustable connection. The valve core can move axially relative to the valve stem within a limited range, allowing the sealing surface to adapt to dimensional variations and achieve precise fitting dynamically, thereby improving closing performance without complicating the overall structure.
Solution Approach 2:
The patent introduces an adjustable parameter (axial position of valve core) that can vary within a certain range. By changing the relative position parameter between valve core and valve stem, the sealing contact can be optimized to compensate for manufacturing tolerances, resolving the contradiction between simple structure and precise fitting.
2Reliability
If higher machining precision and tolerance fit quality are adopted to achieve precise fitting between valve core and valve port, then the closing performance is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of relying on high machining precision to achieve precise fitting, the patent changes the approach by introducing an adjustable parameter (axial position of valve core). This allows standard machining tolerances to be compensated through adjustment, significantly reducing manufacturing cost while maintaining good closing performance.
Solution Approach 2:
The patent replaces static high-precision machining with a dynamic adjustment mechanism. The valve core's axial position can be adjusted to compensate for dimensional variations, allowing the use of lower precision machining while achieving the same functional result, thereby reducing manufacturing cost.
3Device complexity
If the valve core is fixedly connected to the valve stem, then the structural simplicity is improved, but the flexibility of movement for sealing is reduced
Solution Approach 1:
The patent introduces controlled mobility between the valve core and valve stem. The valve core can move axially relative to the valve stem within a limited range defined by the valve stem's outer surface interaction, providing the flexibility needed for sealing while maintaining structural simplicity through the use of standard components.
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 good closing performance without the need for high machining accuracy, reducing costs and preventing issues like evaporation and leakage, while allowing the valve core to move flexibly relative to the valve stem for effective sealing.
Implementation Method 1
an elastic element arranged between the adjusting device and the valve core
Data Source
AI summary
A valve stem and valve core assembly and a valve including a valve stem and valve core assembly. The valve stem and valve core assembly includes a valve stem and a valve core that sleeves the valve stem. The assembly includes an adjusting device arranged on the valve stem, and an elastic element arranged between the adjusting device and the valve core. A clearance exists between the valve core, the valve stem, and the adjusting device, so that the valve core can move relative to the valve stem, such that the valve can have a good closing performance.