Anti-unscrewing Device for Ring Nuts in Tube Couplings
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Solution Overview
Problem
Connections between tubes and valves in fluid conveying systems often loosen due to limited threading travel and mechanical stress from pressure changes, vibrations, and cyclical operations, leading to unreliable connections.
Innovation Solution
An anti-unscrewing device for ring nuts that includes a counter element with an engaging portion and guide means to dictate a movement path, preventing unscrewing by locking the ring nut in place when an unscrewing movement is detected, allowing for secure engagement and disengagement as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ring nut with inner threading is used to connect tubes to valves, then the connection is easy to assemble, but the connection becomes loosened due to limited threading travel and mechanical stress from pressure changes, vibrations, and cyclical operations
Solution Approach 1:
The anti-unscrewing device performs a preliminary locking action after the ring nut is initially screwed onto the valve. The counter element automatically engages with the ring nut's engaging surface and, through the guide means, moves to a locking position that prevents unscrewing movements, thereby securing the connection before mechanical stress can cause loosening.
Solution Approach 2:
The anti-unscrewing device acts as an intermediary component between the ring nut and the valve body. It includes a connecting portion that attaches to the valve, a counter element that interacts with the ring nut, and guide means that control the counter element's movement. This intermediary mechanism prevents direct unscrewing of the ring nut while maintaining the ease of initial assembly.
2Ease of operation
If the ring nut is allowed to move freely for assembly, then assembly is simple, but the ring nut can unscrew under mechanical stress from pressure changes, vibrations, and cyclical valve operations
Solution Approach 1:
The anti-unscrewing device applies a preliminary anti-action by positioning the counter element to counteract any unscrewing movement caused by mechanical stress. When the ring nut attempts to unscrew due to pressure changes, vibrations, or cyclical operations, the counter element moves along the guide means and engages in a locking position that prevents the unscrewing action.
Solution Approach 2:
The device incorporates dynamic elements that adapt to the ring nut's movements. The counter element is designed to move along a specific path dictated by the guide means, allowing it to engage and disengage dynamically. During assembly, the ring nut can be freely screwed on, but once in place, the counter element automatically transitions to a locking position that dynamically prevents unscrewing under various mechanical stresses.
Data Source
AI summary
An anti-unscrewing device for coupling the tubular ends of two components in fluid conveying or delivery systems by means of a threaded ring nut that can be screwed to one of said tubular ends to connect said ends, wherein said anti-unscrewing device comprises a connecting portion to connect the device to one of the components and at least one counter element provided with an engaging portion suitable to engage a corresponding engaging surface formed at said ring nut, such that the engaging portion can be displaced by means of a movement of the ring nut. There are further provided guide means dictating a movement path for the counter element, such that an unscrewing movement of the ring nut will cause the engaging portion to move to a locking position relative to the ring nut thereby preventing the ring nut from unscrewing.