Rotary Coupling Z-Ring Seal Compression Mechanism
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Solution Overview
Problem
Rotary couplings in the oil and gas industry face reliability and maneuverability issues under severe conditions, particularly in accommodating dynamic pipe expansion and axial rotation while maintaining a secure seal.
Innovation Solution
A rotary coupling design featuring an annular outer section with a Z-ring relief, a connector pipe with a seal end and packing chamber, and a retainer ring with compression screws that compress the Z-ring against packing seals, allowing for adjustable sealing and reduced rotational resistance through a taper-defined packing relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annular sealing or packing rings are axially compressed between adjacent internal radially extended faces, then sealing is achieved, but reliability deteriorates under severe conditions
Solution Approach 1:
The patent employs a Z-ring (a flexible sealing element) that can deform and conform to the mating surfaces, providing reliable sealing under severe operating conditions including high pressure and temperature. The Z-ring's flexibility allows it to maintain seal integrity where rigid packing rings would fail.
Solution Approach 2:
The patent introduces a taper-defined packing relief that changes the geometric parameters of the sealing chamber. This taper allows the packing chamber volume to change during operation, enabling the sealing system to adapt to pressure and temperature variations, thereby improving reliability under severe conditions.
2Adaptability or versatility
If rotary coupling is designed to accommodate dynamic pipe expansion and axial rotation, then adaptability is improved, but device complexity increases
Solution Approach 1:
The rotary coupling is divided into distinct functional segments: the Z-ring for sealing, the taper-defined packing relief for accommodation, and the compression screw mechanism for adjustment. This segmentation allows each component to perform its specific function independently, achieving high adaptability while keeping the overall structure manageable.
Solution Approach 2:
The patent incorporates dynamic elements including the Z-ring that can deform elastically to accommodate movement, and the compression screw mechanism that allows for dynamic adjustment of sealing pressure. These dynamic features enable the coupling to adapt to pipe expansion and rotation without requiring a completely complex rigid structure.
3Reliability
If compression screws are used to urge Z-ring against packing seals, then seal performance is improved, but ease of operation deteriorates
Solution Approach 1:
The compression screw mechanism is designed to be self-adjusting through thread engagement. Once the Z-ring and packing seals are positioned, the compression screws can be tightened to apply the necessary sealing force automatically, reducing the need for complex adjustment procedures and making field operation easier while maintaining high seal performance.
4Ease of operation
If taper-defined packing relief is used to reduce rotational resistance, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The taper-defined packing relief uses carefully selected angular parameters to achieve the optimal balance between rotational ease and sealing effectiveness. By standardizing these angular parameters during manufacturing, the design reduces the actual precision variation needed while maintaining the beneficial reduction in rotational resistance.
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 design provides a reliable and easily maneuverable seal that accommodates pipe expansion and rotation with reduced torque resistance and improved seal performance, capable of handling high-pressure and temperature conditions.
Implementation Method 1
the compression screws urging a packing end of Z-ring longitudinally against packing seals thereby compressing the packing seals into the packing chamber creating a seal
Implementation Method 2
reduced torque resistance and improved seal performance
Data Source
AI summary
A rotary coupling includes an annular outer section which has a female end, a threaded portion, and a Z-ring relief. A connector pipe has a connection end, a shoulder, and a seal end. A Z-ring is housed within the Z-ring relief and packing seals are housed within a packing chamber; and a retainer ring is threadably received into the threaded portion of the outer section. The retainer ring receives compression screws there-through, wherein in the engaged position the compression screws urge a packing end of the Z-ring longitudinally against packing seals thereby compressing the packing seals into the packing chamber creating a seal. The compression screws are movable between an engaged and disengaged position in order that in the disengaged position the compression pressure against the Z-ring and packing seals is released by backing off the compression screws without disassembly of the rotary coupling.