Rotary Drilling Tool Collecting Hood Air Accumulation
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Solution Overview
Problem
In rotary drilling tools, the upward-flowing flushing air can destabilize the borehole wall by loosening and removing the stabilizing bentonite film, especially at great drilling depths, leading to instability and inefficiency in the drilling process.
Innovation Solution
A rotary drilling tool design featuring a collecting hood with an air accumulation space above the receiving region and a drain valve to control the discharge of air, preventing it from flowing further upwards and allowing for targeted air reuse, combined with a supply line for continuous flushing air and a variety of removal means such as roller bits and hammers for efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flushing air is supplied continuously to convey ground material, then material removal efficiency is improved, but borehole wall stability deteriorates due to upward air flow damaging the bentonite film
Solution Approach 1:
The harmful upward-flowing air is extracted from the continuous flushing air flow by diverting it into a side branch conduit. This separates the useful function (conveying ground material) from the harmful effect (destabilizing borehole wall), allowing continuous flushing while preventing air from reaching the borehole wall
Solution Approach 2:
A three-way valve acts as an intermediary device to control the direction of flushing air. It mediates between the air supply and the discharge line, enabling selective redirection of air flow to either the discharge line or the side branch, thus controlling when and where air is released
2Productivity
If flushing air flow rate is increased to improve conveying capability, then ground material transport is improved, but energy consumption increases
Solution Approach 1:
Air that would otherwise be wasted (escaping continuously to atmosphere) is recovered and redirected back into the discharge line for productive use. The three-way valve enables this recovery by redirecting flushing air that would be discarded, reducing overall energy consumption while maintaining transport efficiency
Solution Approach 2:
The system uses periodic or controlled action through the three-way valve to release air in specific cycles rather than continuous uncontrolled release. This allows optimization of air usage - providing sufficient air for material conveyance while avoiding excessive energy consumption through controlled timing
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 stabilizes the borehole wall by preventing upward air flow, enhances drilling efficiency by reusing air, and allows for continuous flushing, improving the overall drilling process and material removal efficiency.
Implementation Method 1
by means of the flushing air removed ground material is conveyed away via a discharge line
Implementation Method 2
above the receiving region a collecting hood is provided which closes off an air accumulation space above the receiving region in the upward direction
Implementation Method 3
on the collecting hood a drain valve is arranged which is designed for the targeted discharge of air from the air accumulation space
Implementation Method 4
a supply means for supplying flushing air into the region of the removal means
Data Source
AI summary
The invention relates to a drilling tool and a method for producing a bore in the ground, in which method ground material is carried away by a removal device on the underside of a main body of the drilling tool, flushing air is supplied by a feeding device into the bore, which is filled with drilling fluid, in the area of the removal device and ground material carried away by means of the flushing air is transported away through a discharge line. According to the invention, the ground material is transported to a receiving area in an upper section of the main body. A collecting hood is provided above the receiving area, which closes off the receiving area at the top, forming an air collecting space in which air collects. An outlet valve by means of which air is discharged from the air collecting space is arranged on the collecting hood.