Pressure Reversing Valve Assembly for Down-the-Hole Percussive Drilling
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Solution Overview
Problem
Conventional pressure sensitive valves for down-the-hole drill hammers require complex porting systems, which complicates the efficient use of working fluids.
Innovation Solution
A pressure reversing valve assembly with a housing, distributor, and valve that includes a first, second, and third valve pressure surface, and a valve passageway, allowing for efficient fluid communication and control without the need for a complex distributor, enabling the valve to move between open and closed positions to manage high pressure ports and drive chambers effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure sensitive valves are used, then working fluids can be used to actuate the DHD hammer, but the porting system within the distributor becomes complex
Solution Approach 1:
The valve is divided into multiple pressure surfaces (first, second, and third valve pressure surfaces) that can be independently controlled, allowing separate control of fluid pathways without requiring complex porting in the distributor. Each pressure surface responds to different pressure conditions to control valve position.
Solution Approach 2:
The valve assembly acts as an intermediary component between the high pressure port and the drive chamber, mediating fluid flow through its pressure surfaces and passageways. This intermediary structure simplifies the distributor by concentrating the control logic in the valve rather than requiring complex porting throughout the distributor.
2Loss of time
If a complex distributor is used to control fluid flow, then precise timing can be achieved, but the overall device complexity increases
Solution Approach 1:
The valve is designed to dynamically respond to pressure changes on its three pressure surfaces, automatically adjusting its position based on real-time pressure conditions. This dynamic response achieves precise timing control without requiring a statically complex distributor structure with multiple ports and passages.
Solution Approach 2:
The valve assembly performs its own timing control function through the interaction of its three pressure surfaces with different pressure sources. The valve automatically sequences fluid flow based on pressure differential without requiring external timing mechanisms or complex distributor porting arrangements.
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 allows for efficient use of working fluids, controlling the timing and flow of pressurized fluids to enhance the operational efficiency of the down-the-hole drilling apparatus, reducing complexity and improving performance.
Implementation Method 1
The valve includes a first valve pressure surface, a second valve pressure surface, a third valve pressure surface... The first valve pressure surface engages an internal surface of a housing... and is in communication with a drive chamber... The second valve pressure surface is in communication with a high pressure port... The third valve pressure surface is in communication with a passageway extending through a distributor
Data Source
AI summary
A pressure reversing valve for a down-the-hole percussive drilling (“DHD”) apparatus has a first valve pressure surface, a second valve pressure surface and a third valve pressure surface. The first valve pressure surface engages an internal surface of a housing of the DHD hammer. The second valve pressure surface is in communication with a high pressure port of the DHD hammer. The third valve pressure surface is in communication with a passageway that extends through a distributor within the DHD hammer. The valve also includes a valve passageway that extends through the valve and which is in communication with a first volume of the DHD hammer. The first volume is formed by surfaces of the distributor and the third valve pressure surface.