Gate Valve Plate Mounting Structure for Low-Particle Fixation
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Solution Overview
Problem
The existing gate valve designs generate particles due to the valve plate rubbing against the valve rod or seat during operation, necessitating a secure and accurate fixation method to minimize particle generation.
Innovation Solution
A mounting structure for the valve plate on the valve rod, featuring a mounting hole with a wedge-shaped gap and a spacer to ensure precise alignment and secure attachment using a fixation screw, which tightens to press the valve plate firmly against the rod, reducing particle generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the valve plate is detachably fixed to the valve rod using conventional mounting methods, then maintenance becomes easier, but particle generation increases due to rubbing between the valve plate and valve rod
Solution Approach 1:
The patent introduces a mounting structure comprising a mounting portion on the valve rod and a mounting hole in the valve plate that receives the mounting portion. This intermediary mounting structure acts as a mediator between the valve plate and valve rod, providing a dedicated interface that reduces direct rubbing and particle generation while maintaining detachability for maintenance purposes.
Solution Approach 2:
The mounting structure is segmented into distinct components: a mounting portion formed at the end of the valve rod and a mounting hole formed in the valve plate. This segmentation allows for precise fitting and reduced contact friction compared to conventional direct fixation methods, thereby reducing particle generation while preserving ease of maintenance.
2Manufacturing precision
If the valve plate is securely fixed to the valve rod to minimize particle generation, then manufacturing precision must be increased, but device complexity increases
Solution Approach 1:
The mounting structure serves multiple functions simultaneously: it provides secure fixation to minimize particle generation, enables detachability for maintenance, and creates a precise interface between the valve plate and valve rod. By consolidating these functions into a single mounting structure, the patent avoids increasing device complexity while achieving high fixation accuracy.
Solution Approach 2:
The patent merges the fixation function and the positioning function into a single integrated mounting structure. The mounting portion and mounting hole together provide both secure attachment and precise alignment, eliminating the need for separate positioning and fixation mechanisms, thereby maintaining manufacturing precision without excessive complexity.
Data Source
AI summary
A spacer having a wedge-shaped flat plate portion and an engagement protrusion is interposed between a hole end surface of mounting hole of a valve plate and a rod end surface of mounting portion of a valve rod, which thereby forms a wedge-shaped gap between the spacer and the hole end surface so as to open frontward. A fastening force of a valve-plate fixation screw generates a moment M that deforms the valve plate in a direction of narrowing the gap. At the same time, the engagement protrusion of the spacer is pressed into a wedge-shaped space between the inclined surface portion of the rod end surface and the rear hole-wall surface of the mounting hole, which causes the front hole-wall surface of mounting hole of the valve plate to press the rod front surface of mounting portion of the valve rod.