Floating Cylinder Sealing Test Platform for Friction Measurement
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Solution Overview
Problem
Current technologies face challenges in simulating and measuring the performance of reciprocating seals under high-pressure and high-speed conditions, as they struggle to maintain stable temperature control and accurately measure frictional forces due to the complexity of constructing and maintaining such severe environments.
Innovation Solution
A testing platform with a floating cylinder, equipped with a high-speed driving device and a cooling system, utilizes a slider-crank mechanism and linear bearings to achieve stable high-pressure and high-speed reciprocating motion, allowing for accurate measurement of frictional forces through a tension-compression sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional fixed cylinder setup is used, then the structure is simple, but the friction measurement is inaccurate due to guide rail friction interference
Solution Approach 1:
The cylinder is changed from a fixed static mounting to a floating dynamic mounting on rolling guide rails. This allows the cylinder to move freely in response to friction forces, enabling accurate measurement of sealing ring friction without the interference of fixed guide rail friction. The floating mounting transforms the measurement system into a dynamic equilibrium state where the measured force directly reflects the sealing friction.
Solution Approach 2:
Rolling guide rails are introduced as an intermediary element between the fixed frame and the floating cylinder. These guide rails provide a low-friction rolling contact interface that allows the cylinder to move smoothly while minimizing frictional interference with the measurement. The rolling guide rails act as a mediator that transmits motion while isolating the measurement from extraneous friction forces.
2Speed
If high-speed reciprocating motion is implemented, then sealing performance can be tested under relevant conditions, but inertial impacts become unstable
Solution Approach 1:
A counterweight mechanism is introduced to balance the inertial forces generated during high-speed reciprocating motion. The counterweight is positioned and configured to produce opposing inertial forces that cancel out the unstable inertial impacts generated by the reciprocating piston rod, thereby stabilizing the system during high-speed operation while maintaining the necessary reciprocating motion for sealing performance testing.
3Reliability
If high-pressure and high-speed conditions are created, then realistic sealing performance can be measured, but temperature rise becomes severe
Solution Approach 1:
The cooling system is extracted as a separate functional subsystem from the high-pressure testing chamber. This allows the cooling function to be independently optimized and controlled, enabling effective heat removal from the sealing interface and piston rod without interfering with the high-pressure and high-speed testing conditions. The separated cooling system can be tuned to handle the thermal loads generated during realistic sealing performance measurements.
4Temperature
If a cooling system is added to control temperature, then temperature rise can be managed, but device complexity increases
Solution Approach 1:
The cooling system is segmented into distinct functional modules: a cooling fluid circulation loop, a heat exchange system for the piston rod, and a temperature control system for the sealed interface. This segmentation allows each component to be independently designed and optimized for its specific thermal management function, reducing overall system complexity while maintaining effective temperature control across the high-pressure and high-speed testing environment.
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 setup provides a stable and accurate means to measure frictional forces, enabling comprehensive experimental data collection for reciprocating sealing performance under harsh conditions, balancing inertial impacts and ensuring effective cooling.
Implementation Method 1
the frictional force of a sealing ring on the cylinder 6 can be directly measured
Implementation Method 2
mounted to the frame 1 through a tension-compression sensor 10
Implementation Method 3
The outer wall of the cylinder 6 is matched and fixed with inner walls of a left water jacket 4 and a right water jacket 8
Implementation Method 4
a left water inlet 20 and a left water outlet 19 connected to two ends of the left water groove 5 respectively
Implementation Method 5
a rolling guide rail 9 is fixed on the frame 1, the cylinder body for testing comprises a cylinder 6, the cylinder 6 is floatingly mounted on the rolling guide rail 9
Implementation Method 6
utilizes a slider-crank mechanism and linear bearings to achieve stable high-pressure and high-speed reciprocating motion
Implementation Method 7
The piston rod 13 penetrates through the left linear bearing 22 and the right linear bearing 14
Data Source
AI summary
A testing platform with a floating cylinder for high-pressure and high-speed reciprocating sealing experiment, characterized in that, includes a frame, a cylinder body for testing and a high-speed driving device, the frame comprises a horizontal rolling guide rail (9), the cylinder body for testing comprises a cylinder, the cylinder is floatingly mounted on the rolling guide rail and is mounted to the frame through a tension-compression sensor which is in the same direction as the rolling guide rail, the cylinder is cylindrical as a whole, has a cavity in a middle and openings on two sides with a diameter slightly greater than a diameter of a test rod, the cylinder includes a left end cover affixed on a left side, a right end cover affixed on a right side, a left seal between the left end cover and the cylinder, a right seal between the right end cover and the cylinder, the piston rod penetrates into the cylinder horizontally and passes through the left end cover, the left seal, the right seal and the right end cover, the piston rod has one side connected to the high-speed driving device with a motor. The present invention can provide stable high-pressure and high-speed working conditions, can accurately measure the frictional force of the sealing ring, and provide more extensive experimental conditions and experimental data for the research of reciprocating sealing performance.