Rotary Compensator Conical Sealing for High-Pressure Reliability

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Solution Overview

Problem

Existing rotary compensators face challenges in achieving long-term safe operation due to high demands on sealing performance and pressure resistance, leading to frequent damage and replacement of sealing rings.

Innovation Solution

Incorporating a conical face sealing structure between the fixed and rotatable pipes, supplemented by end face sealing, to enhance sealing performance and reduce reliance on single end face sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If single end face sealing is used, then the structure is simple, but the sealing performance under high pressure is insufficient and the sealing ring is easily damaged

Engineering Contradiction:

Improvesealing performanceVSAvoidsealing structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing structure is divided into multiple independent sealing faces: end face sealing, annular face sealing, and conical face sealing. Each sealing face operates independently to provide multiple barriers against leakage, with the conical face sealing specifically addressing high-pressure conditions where single end face sealing fails.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing faces are arranged in a nested configuration where the conical face sealing is positioned within the end face sealing structure, and the annular face sealing is integrated into the same assembly. This nested arrangement maximizes space utilization while providing multi-layer sealing protection.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Strength

If high-pressure resistant sealing ring is used, then pressure resistance is improved, but the sealing ring is still easily damaged and requires regular replacement

Engineering Contradiction:

Improvepressure resistanceVSAvoidservice life

Core Design Contradiction:

StrengthVSDuration of action of stationary object

Solution Approach 1:

Different sealing faces are designed with different geometric properties optimized for their specific functions: the conical face provides gradual pressure distribution, the annular face handles radial sealing, and the end face provides axial sealing. This local optimization of sealing geometry reduces stress concentration and prevents damage even under high pressure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The conical face sealing is positioned to engage first and distribute pressure gradually before the full pressure reaches the other sealing faces. This preliminary action of pressure distribution prevents sudden stress shocks that would damage the sealing rings, extending their service life.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple sealing faces are added, then sealing performance is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvesealing performanceVSAvoidmanufacturing simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Multiple sealing faces (end face, annular face, and conical face) are integrated into a single unified sealing assembly rather than separate components. This merging approach maintains sealing effectiveness while reducing the number of separate manufacturing processes and assembly steps required.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sealing assembly is designed to perform multiple sealing functions simultaneously with a single integrated structure. The conical face provides both pressure distribution and sealing, while the annular and end faces provide additional sealing planes, making the entire assembly multi-functional and reducing overall manufacturing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 conical face sealing structure improves high-pressure sealing performance, simplifies manufacturing, reduces production costs, and lowers the performance index of end face sealing pieces, ensuring long-term safe operation.

Implementation Method 1

internal pressure self-sealing rotary compensator... The conical face sealing can achieve the advantage that the higher the pressure, the better the sealing performance

Methodology Applied

Scientific EffectPressure differential sealing: Pressure Gradient

Data Source

PatentUS20250216011A1Internal pressure self-sealing rotary compensator

Publication Date: 2025.07.03 SONG NA

AI summary

An internal pressure self-sealing rotary compensator has fixed and rotatable pipes; a fixed pipe end portion has a conical opening connected to a sealing base with an inner cavity having an inwardly protruding rotating base; an annular face sealing piece is on a rotating base outer side, and the annular face sealing piece is fixed in an annular face sealing cavity; an end face self-sealing piece is on a rotating base inner side, an end face self-sealing piece outer side face abuts against a rotatable pipe arc-shaped annular protruding face, an arc-shaped annular protruding face outer section smoothly transitions with a first outer conical face at the rotatable pipe end, and an arc-shaped annular protruding face inner section intersects with a rotatable pipe outer surface; the first outer conical face connecting to a second, and the second outer conical face taper matches that of fixed pipe end portion conical opening.