DTH Hammer Fluid System with Segmented Piston Control
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Solution Overview
Problem
Existing down-the-hole (DTH) drill hammers do not fully utilize the capacity of additional drive and lifting chambers, resulting in reduced power and penetration rate, especially at greater depths, due to continuous connection of at least one chamber to the pressurized fluid source, leading to inefficient energy conversion and drilling capacity.
Innovation Solution
A pressurized fluid flow system with multiple chambers, including auxiliary drive and lifting chambers formed around the piston's waists and externally delimited by cylinders, where the supply and discharge of pressurized fluid are controlled by a coaxially disposed control tube and sealing means, allowing for efficient fluid distribution and utilization across all chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional drive and lifting chambers are added to increase effective thrust areas, then power and penetration rate are improved, but at least one chamber is continuously connected to the pressurized fluid source resulting in null work and reduced energy efficiency
Solution Approach 1:
The piston is divided into multiple segments with separate drive chambers and lifting chambers on different sides. Each chamber can be independently controlled for pressure application, allowing the system to segment the fluid pressure application timing and location to maximize work extraction from each chamber cycle.
Solution Approach 2:
The system dynamically controls the connection and disconnection of chambers to the pressurized fluid source through movable control elements (such as spools or valves) that respond to piston position and pressure differential, ensuring that each chamber receives pressurized fluid only when it can perform useful work.
2Productivity
If multiple chambers are used to increase effective thrust areas, then drilling capacity at greater depths is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The control mechanism serves multiple functions simultaneously: it directs pressurized fluid to the appropriate chambers, controls discharge timing, and responds to piston position feedback. This multi-functionality reduces the need for separate dedicated components for each control task, thereby managing complexity while handling multiple chambers.
Solution Approach 2:
The control elements are nested within the piston structure or chamber architecture, with control spools or valves integrated into the existing pressure pathways. This nesting approach allows multiple control functions to be housed within the compact DTH hammer structure without proportionally increasing external complexity.
3Productivity
If additional chambers are incorporated to enhance power output, then penetration rate increases, but manufacturing complexity and cost increase
Solution Approach 1:
Multiple drive chambers and lifting chambers are designed with identical or similar structural configurations, allowing for standardized manufacturing processes, interchangeable parts, and simplified production tooling. This homogeneity in chamber design reduces manufacturing complexity despite the increased number of chambers.
Solution Approach 2:
Adjacent chambers share common structural boundaries, such as the piston wall or chamber walls, which serve dual purposes as both structural support and pressure containment for neighboring chambers. This merging of walls and structures reduces the total material required and simplifies manufacturing compared to completely separate chamber designs.
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 system enhances pressurized fluid consumption, increases power and penetration rate, and improves energy conversion efficiency, enabling greater drilling capacity at deeper depths without affecting the hammer's useful life, applicable to both normal and reverse circulation DTH drill hammers.
Implementation Method 1
the difference in pressure between the lifting and drive chambers causes the reciprocating movement of the piston
Implementation Method 2
the impact of the same on the drill bit with each working stroke of the piston
Data Source
Figure 1
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AI summary
A pressurized fluid flow system for a down the hole drill hammer has a plurality of chambers that exert work, namely one or more auxiliary drive and lifting chambers besides two main chambers located at opposite ends of the piston, the auxiliary chambers each formed around respective waists on the piston and externally delimited by respective cylinders which are arranged longitudinally in series. Two or more internal chambers filled with the pressurized fluid are defined by recesses in the inner surfaces of the piston for supplying said fluid to the work chambers, controlled in a cooperative way by the piston and a control tube coaxially arranged within a central bore of the piston. One or more discharge chambers are formed in between the outer casing and the cylinders for emptying the work chambers through discharge ports in the cylinders. Reverse and normal circulation drill hammers are provided having this system.