Mechanical Seal Lock Ring Assembly for Over-Tightening Protection
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Solution Overview
Problem
Conventional mechanical seals often suffer from over-tightening of locking screws, which can damage the lock ring and require entire assembly replacement if the tightening mechanism fails.
Innovation Solution
A lock ring assembly with a barrel nut that allows adjustable tightening and flex regions, reducing bending stresses and enabling more torque to be directly applied to the lock ring, while maintaining structural integrity and allowing for single-point tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional locking screws are used to secure the lock ring, then the lock ring can be tightened to the shaft, but the locking screws can be inadvertently over-tightened and damage the lock ring
Solution Approach 1:
The locking mechanism is divided into separate functional components: a bolt element for applying tightening force, a barrel nut for controlling and limiting the tightening action, and the lock ring for securing the seal assembly. This segmentation allows the tightening function to be isolated from the lock ring, preventing direct damage to the lock ring while still achieving secure fastening.
Solution Approach 2:
The barrel nut acts as an intermediary element between the bolt element and the lock ring. It controls the tightening action by allowing the bolt to be threaded in and out, providing a stopping point that prevents over-tightening. This intermediary mechanism protects the lock ring from excessive forces while still enabling effective securing of the seal assembly.
2Strength
If integrated set screws are used in the lock ring assembly, then the lock ring can be secured to the shaft, but the set screws can be inadvertently overtightened and damage the shaft
Solution Approach 1:
The locking function is segmented into a separate bolt-nut mechanism rather than using integrated set screws. This separates the high-force tightening action from the lock ring and shaft interface, allowing the shaft to be secured without exposing it to the harmful effects of over-tightening that plague integrated set screw designs.
Solution Approach 2:
The barrel nut serves as an intermediary that mediates the tightening force between the bolt element and the lock ring assembly. It provides a controlled interface that prevents excessive force from being transmitted to the shaft, thereby protecting the shaft from damage while still achieving secure attachment.
3Reliability
If conventional tightening mechanisms are used, then the lock ring can be secured, but the entire lock ring assembly needs to be replaced if the tightening mechanism fails
Solution Approach 1:
The locking mechanism is segmented into replaceable components (bolt element, barrel nut) that are separate from the lock ring main body. This segmentation enables individual component replacement rather than entire assembly replacement, significantly improving ease of repair while maintaining overall system reliability.
Solution Approach 2:
The design allows for selective replacement of worn or failed components (such as the bolt element or barrel nut) while retaining the lock ring and other functional components. This selective replacement approach recovers valuable components and reduces waste, improving both repairability and sustainability.
4Strength
If a barrel nut is used to allow adjustable tightening, then more torque can be applied to the lock ring, but the device complexity increases
Solution Approach 1:
The barrel nut performs multiple functions: it controls the tightening action, provides a stopping point to prevent over-tightening, and enables adjustable torque application. By consolidating these functions into a single component with a simple cylindrical geometry, the design achieves enhanced torque application without proportionally increasing complexity.
Solution Approach 2:
The barrel nut enables parameter changes in the tightening process by allowing the bolt element to be threaded in and out to different positions. This provides adjustable torque and clamping force while maintaining a simple mechanical interface, balancing enhanced performance with acceptable complexity.
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
This solution enhances the strength and durability of the lock ring, reduces the risk of damage from over-tightening, and allows for easier replacement of individual components rather than the entire assembly.
Implementation Method 1
The lock ring also includes a plurality of flex regions in the form of notches that allow the lock ring to flex when the main body is tightened about the shaft
Data Source
AI summary
A mechanical seal that employs a lock ring assembly having associated therewith a locking mechanism. The locking mechanism can include a nut element, such as a barrel nut, that allows an associated bolt element to adjust a tightening load and position while clamping occurs of the components of the mechanical seal. This adjustment flexibility removes or reduces unwanted bending stresses in the bolt element, thus allowing for more torque to translate directly to the lock ring. The barrel nut allows for more material to remain in the lock ring, thus providing for additional overall strength relative to a traditional locking element. The lock ring also includes a plurality of flex regions in the form of notches that allow the lock ring to flex when the main body is tightened about the shaft.