Separable Rod Guide Assembly for Valves
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Solution Overview
Problem
Common rod guide assemblies for valves experience poor guiding performance due to high friction coefficients and are prone to disassembly under high-pressure conditions, requiring strong materials or larger screws, which are costly or not feasible in compact designs.
Innovation Solution
A separable rod guide assembly with a rod guide cover and body made from different materials, where the cover has higher strength and the body has a lower friction coefficient, allowing for improved guiding performance and reduced force against high pressures, achieved through material selection and design features like threaded engagement and seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rod guide assembly is made from high strength material such as alloy steel, then the strength requirement is satisfied, but the friction coefficient with the valve rod increases resulting in poor guiding performance
Solution Approach 1:
The rod guide assembly is divided into two separate components: a rod guide cover and a rod guide body. The cover is made from high strength material (alloy steel) to satisfy strength requirements, while the body is made from low friction material (stainless steel or copper alloy) to reduce friction with the valve rod. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The invention uses composite material construction by combining two different materials in a single assembly. The rod guide cover uses alloy steel for strength, while the rod guide body uses stainless steel or copper alloy for low friction properties. This composite approach allows the system to simultaneously achieve both high strength and low friction characteristics that cannot be obtained with a single material.
2Stability of the object's composition
If the size of screws is increased to maintain the rod guide assembly in place under high pressure, then the assembly stability improves, but the device complexity and cost increase
Solution Approach 1:
By segmenting the rod guide assembly into a cover and body that can be separated and reassembled, the invention eliminates the need for oversized screws to maintain assembly integrity under pressure. The separable design with threaded engagement allows the assembly to be easily put together and taken apart without requiring high-strength fasteners, thus reducing device complexity while maintaining stability during operation.
3Ease of operation
If the rod guide assembly is made separable for easy assembly and disassembly, then the ease of operation improves, but the reliability of the connection may deteriorate
Solution Approach 1:
The rod guide assembly is designed as a separable structure with a cover and body that can be easily assembled and disassembled through threaded engagement. This segmentation provides ease of operation for maintenance and replacement while the threaded connection mechanism ensures reliable connection during normal operation, resolving the contradiction between ease of operation and connection reliability.
Solution Approach 2:
The threaded engagement mechanism acts as an intermediary between the cover and body, providing a reliable yet easily reversible connection. The threads create a mechanical interlock that ensures connection reliability during operation while allowing for simple assembly and disassembly when needed, thus mediating between the conflicting requirements of reliability and ease of operation.
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 separable rod guide assembly enhances guiding performance and reduces the force exerted by high-pressure fluids, enabling smaller, cost-effective components and easier assembly/disassembly, while maintaining sealing integrity.
Implementation Method 1
the friction coefficient between the rod guide body and the rod is smaller than the friction coefficient between the rod guide cover and the rod
Implementation Method 2
the rod guide assembly is subjected to a significant force Fp from the fluid, which tends to pull the rod guide assembly 10 apart especially in the case of the fluid having a high pressure such as above 10 Mpa
Data Source
AI summary
A rod guide assembly for a valve, which includes a rod guide cover and a rod guide body that engage with each other, wherein the rod guide cover together with the rod guide body define a guide channel in which a rod slides. The friction coefficient between the rod guide body and the rod is smaller than the friction coefficient between the rod guide cover and the rod.