Magnetic-Coupled Wear Test Platform for High-Pressure Silted Seawater
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Solution Overview
Problem
Existing friction and wear testing machines fail to simulate the ultra-high-pressure silt-carrying seawater environment and submarine negative pressure, leading to leakage, attenuated loading performance, and incomplete sealing, which hinders the accurate exploration of friction and wear mechanisms in marine environments.
Innovation Solution
A friction and wear testing platform with a tank, loading device, partition plate, partition cylinder, sealing sleeves, rotating shaft, inner and outer magnetic cylinders, and a centering table, designed to create a sealed environment with magnetic loading and pressure compensation, allowing for simulation of high-pressure, silt-containing, and turbid submarine conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an annular loading cylinder is adopted to achieve same-side and heteroaxial loading, then the loading capability is improved, but the device complexity increases and the autoclave wall thickness requirement conflicts with magnetic transmission needs
Solution Approach 1:
The loading system is segmented into two independent parts: a loading device for applying axial and radial forces, and a magnetic transmission system for torque transmission. This segmentation allows each subsystem to be optimized independently, resolving the conflict between loading capability and magnetic transmission requirements.
Solution Approach 2:
A magnetic coupling mechanism acts as an intermediary between the loading device and the test sample, enabling torque transmission through the autoclave wall without requiring direct mechanical contact or thick walls. The magnetic field penetrates the thin autoclave wall to transmit rotational force.
2Measurement precision
If a non-contact sealing method is used to eliminate contact seal interference, then the friction torque measurement accuracy is improved, but absolute sealing cannot be achieved and particle wear on bearings occurs
Solution Approach 1:
The sealing function is extracted from the bearing support system and implemented separately through a magnetic coupling mechanism. This allows the bearing to be positioned outside the sealed chamber while still transmitting torque through the wall, achieving both non-contact sealing and absolute sealing of the chamber.
Solution Approach 2:
The magnetic coupling serves as an intermediary that transmits rotational force and torque measurement signals through the autoclave wall without requiring physical penetration or contact seals. The magnetic field acts as the mediator between the internal and external environments.
3Stress or pressure
If the autoclave wall thickness is increased to withstand high pressure, then the pressure resistance is improved, but the magnetic transmission efficiency decreases due to thicker wall阻隔
Solution Approach 1:
The system segments the pressure containment function (autoclave wall) from the torque transmission function (magnetic coupling). The thin autoclave wall maintains pressure resistance while the magnetic coupling efficiently transmits torque through the wall, eliminating the trade-off between wall thickness and magnetic transmission.
4Reliability
If permanent-magnetic loading is used to eliminate leakage and sealing resistance, then the sealing performance is improved, but the loading efficiency and capacity are reduced due to autoclave wall thickness constraints
Solution Approach 1:
The patent merges the permanent-magnetic loading advantage (sealing performance) with a mechanical loading device (loading efficiency) by using the magnetic coupling only for torque transmission while the mechanical loading device handles axial and radial loading through the thin autoclave wall.
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 platform achieves reliable sealing, improved loading efficiency, enhanced test accuracy, and stability, enabling the simulation of real marine environments and precise exploration of friction and wear mechanisms under submarine conditions.
Implementation Method 1
an inner magnetic cylinder and an outer magnetic cylinder; a gap is left between an outer wall of the inner magnetic cylinder and an inner wall of the partition cylinder
Data Source
AI summary
A friction and wear testing platform capable of simulating high-pressure, silt-containing and turbid submarine environment, including a tank, a loading device, a partition plate, a partition cylinder, a top sealing sleeve, a bottom sealing sleeve, a rotating shaft, an inner magnetic cylinder, an outer magnetic cylinder and a centering table. The partition plate and the partition cylinder divide an inner chamber of the tank into a test chamber and a pressure compensation chamber. The rotating shaft penetrates the pressure compensation chamber; two ends of the rotating shaft are sealed by the top and bottom sealing sleeves, respectively, as well as sealing bearings and rings therein. The loading device drives the rotating shaft to rotate, and the rotating shaft drives the inner magnetic cylinder to rotate. The centering table is driven through the magnetic coupling between the inner and outer magnetic cylinders to install a test piece.