Sealed Thrust Ball Bearing for Drill Inner Tube Assembly
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Solution Overview
Problem
Conventional rope coring drill tools face challenges in maintaining high-quality drill cores, especially in complex geological formations, due to poor single action performance between the inner and outer tubes, and exposure of bearings to drilling fluid, leading to bearing seizure and loss of single action performance.
Innovation Solution
An inner tube assembly with a sealed single action mechanism, featuring a bearing block with a thrust ball bearing and sealing ring seat, which prevents drilling fluid from entering the bearing block, ensuring stable single action performance and protecting the bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing is exposed to the drilling fluid during operation, then the structure is simple and easy to manufacture, but the bearing is prone to seizure and loses single action performance
Solution Approach 1:
The patent employs a sealing ring (flexible sealing element) to isolate the bearing from drilling fluid. The sealing ring is installed in the bearing block to create a barrier that prevents drilling fluid from reaching the bearing, thereby protecting the bearing from seizure while maintaining a relatively simple overall structure.
Solution Approach 2:
The sealing ring acts as an intermediary element between the bearing and the drilling fluid environment. It mediates the interaction by blocking the drilling fluid from directly contacting the bearing, thus preserving the bearing's single action performance without requiring complex protective structures.
2Reliability
If the bearing is protected from drilling fluid, then the single action performance is maintained, but the structure becomes more complex
Solution Approach 1:
The sealing ring provides a simple yet effective protective barrier. By using this flexible sealing element, the patent achieves bearing protection from drilling fluid without introducing complex mechanical structures, thus maintaining reliability while minimizing structural complexity.
3Productivity
If drilling fluid enters the bearing block, then the flushing effect is improved, but the bearing seizes and single action performance is lost
Solution Approach 1:
The sealing ring creates a physical barrier that prevents drilling fluid from entering the bearing block. This isolation ensures that the bearing maintains its single action performance while still allowing the drilling process to function effectively, thus resolving the conflict between flushing effect and bearing reliability.
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 solution effectively isolates the single action mechanism from drilling fluid, ensuring stable and long-lasting single action performance, thereby improving drill core quality and facilitating the use of rope coring drilling in challenging geological conditions.
Implementation Method 1
a single action mechanism including a bearing block and a thrust ball bearing, wherein the thrust ball bearing is built into a shaft part of the bearing block
Implementation Method 2
the bearing block is provided with a sealing ring seat sealed with the shaft
Data Source
AI summary
Provided is an inner tube assembly of a drill includes an inner tube assembly upper part and an inner tube assembly lower part which are rotatable relatively and connected together through a shaft and a single action mechanism including a bearing block and a thrust ball bearing, a bearing is built into a shaft part of the bearing block, the shaft is connected in the thrust ball bearing of the bearing block, the bearing block is provided with a sealing ring seat sealed with the shaft. A rope coring drill tool including the inner tube assembly of drill tool described above is also provided. The present disclosure can avoid entry of drilling fluid into the bearing, effectively protect the bearing and safeguard single action performance of the drill tool.