Suction Valve Unloader Anti-Rotation Lock Sleeve
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Solution Overview
Problem
Suction valves in compressors face high wear and damage due to unloader rotation, especially during dry-running, as existing solutions like guide strips and synthetic stopping blocks are costly and can negatively impact flow conditions, requiring customization for various geometric shapes.
Innovation Solution
A cylinder-shaped lock sleeve with a non-circular outer contour and a central axially through-going opening is used to provide anti-rotation and guidance for the unloader, allowing for universal application across different valve geometries without influencing flow conditions, and can be adjusted for precise axial movement limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stopping blocks made of synthetic material are used to prevent unloader rotation, then wear and damage are reduced, but manufacturing costs increase due to customization for different geometric shapes
Solution Approach 1:
The invention employs a universal locking mechanism consisting of a lock sleeve with non-circular outer contour and a corresponding locking element with inner contour that fits into a recess in the valve seat. This standardized design can be applied across different suction valve geometries without customization, eliminating the need for geometry-specific stopping blocks while maintaining reliable anti-rotation functionality and reducing manufacturing costs.
2Reliability
If stopping blocks are used to prevent unloader rotation, then wear is reduced, but flow conditions are negatively influenced
Solution Approach 1:
The invention extracts the anti-rotation function from the flow path area by positioning the lock sleeve and locking element in a location that does not interfere with fluid flow. The locking mechanism is implemented through a recess in the valve seat and corresponding elements on the lock sleeve, separating the rotational constraint function from the flow channels, thereby maintaining optimal flow conditions while preventing unloader rotation.
3Reliability
If guide strips and guide rings are used to prevent wear during dry-running, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention combines the guidance function and the anti-rotation locking function into a single integrated lock sleeve structure. The lock sleeve with its non-circular outer contour serves both to guide the unloader axially and to prevent rotation through the locking element, eliminating the need for separate guide strips and guide rings, thereby reducing structural complexity while maintaining wear protection during dry-running operations.
Data Source
AI summary
A suction valve includes a non-rotatable lock sleeve 20 concentrically arranged on a valve seat 3, the lock sleeve having a non-circular outer contour onto which an unloader 22 is placed with its radial central section 28 and which is correspondingly formed in a diametrically opposed manner to prevent turning.