Fluid Drilling Device Piston Segmentation and Flow Path
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Solution Overview
Problem
Existing fluid-operated drilling devices experience rapid wear and contamination issues when using high viscosity fluids like mud or oil, due to increased friction and difficulty in flushing out debris, leading to reduced service life and efficiency.
Innovation Solution
A drilling device design featuring a detachable piston with separate upper and lower parts, where pressurized fluid flows directly into a hollow portion without narrow channels, and discharged fluid is used to flush and lubricate, reducing wear and facilitating debris removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high viscosity fluids like mud or oil are used for drilling, then the fluid has better capacity to carry drilled waste material and support the drill hole, but the increased friction causes rapid wear of internal parts and reduces service life
Solution Approach 1:
The piston is divided into upper and lower parts that can detach from each other, allowing the upper part (which experiences more wear) to be replaced independently while keeping the lower part in use. This segmentation enables selective replacement of worn components.
Solution Approach 2:
The patent changes the physical state and flow characteristics of the fluid by optimizing pressure parameters and flow paths. The fluid is directed to flow directly into the hollow portion of the piston rather than through narrow channels, reducing flow velocity and friction.
2Use of energy by moving object
If narrow channels are used to transport pressurized fluid to the piston, then the fluid can be delivered effectively, but the high fluid speed causes increased friction and abrasive wear on channel walls
Solution Approach 1:
The patent extracts the fluid flow path from the narrow channels and redirects it to flow directly into the hollow portion of the piston. This removes the harmful narrow channel geometry that causes high velocity and abrasive wear, while maintaining effective fluid delivery.
Solution Approach 2:
The hollow portion of the piston acts as an intermediary chamber that receives pressurized fluid directly. This intermediary space allows the fluid to be delivered effectively without forcing it through narrow channels, thereby reducing friction and wear.
3Device complexity
If the piston is made as a single solid piece, then the structure is simple, but it is difficult to replace only the worn upper part while keeping the functional lower part
Solution Approach 1:
The piston is segmented into upper and lower parts that can detach from each other. The upper part contains the hollow portion and experiences more wear, while the lower part remains functional. This segmentation allows the upper part to be replaced independently, improving ease of repair while maintaining reasonable structural simplicity.
4Productivity
If high speed fluid flow is used to transport cuttings, then the cuttings can be removed efficiently, but the high speed causes increased friction and wear on internal surfaces
Solution Approach 1:
The patent extracts the fluid flow from the narrow internal channels and redirects it to flow directly into the hollow portion of the piston and then out through the lower part. This removes the high-velocity flow path that causes abrasive wear on internal surfaces, while maintaining cuttings removal efficiency through the alternative flow path.
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 minimizes internal wear, extends the service life of the drilling device, and maintains efficiency even with abrasive fluids by reducing fluid speed and facilitating continuous flushing and lubrication.
Implementation Method 1
a hollow portion, a first communication hole connected to the hollow portion and an annular pressurizing portion protruding on the piston's outer circumferential surface... the hollow portion being open to lead pressurized operating fluid directly to the hollow portion of the piston from the fluid pressure supply passage
Implementation Method 2
discharged fluid is used to flush and lubricate, reducing wear and facilitating debris removal
Implementation Method 3
a reciprocating piston slidably installed in the piston housing, for impacting a drill bit of a bit unit installed at a lower end of the main body
Data Source
AI summary
A fluid operated drilling device for drilling a hole said device having a hammer, a rotation device and a drill rod. The hammer includes a tubular main body, a back head, a cylindrical piston housing, a reciprocating piston, a space, a valve unit and a fluid pressure supply unit. A hollow portion of the piston is open to lead pressurized operating fluid directly to the hollow portion from the fluid pressure supply passage. The hammer includes an axial exhaust passage formed between the main body and the piston housing. The valve unit includes a valve exhaust passage and the piston has a lower part and an upper part detachably connected to each other. The invention also relates to a method for drilling a hole using the fluid operated drilling device.