Drill Backhead with Integrated Piston for Fluid Flow Efficiency
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Solution Overview
Problem
Conventional fluid-operated drilling tools face difficulties in disassembly for repair, have inefficient fluid flow paths due to sharp bends and restricted areas, and experience slow transitions between operational phases, which affect overall efficiency.
Innovation Solution
A drill assembly with an integrated backhead and piston, featuring a hollow elongate wear sleeve and a backhead with passages between the axial bore and outer surface, allowing for easy disassembly and improved fluid flow efficiency by eliminating sharp bends and increasing the available piston area, enabling faster transitions and enhanced power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distributor is secured to the wear sleeve by a retaining ring received in a circumferential groove, then the distributor is held in place, but it becomes difficult to access and disengage the retaining ring for repair or replacement
Solution Approach 1:
The invention extracts the distributor from the wear sleeve assembly, making it a separate, independently replaceable component. The distributor is no longer secured to the wear sleeve but is instead held within the backhead assembly, allowing it to be removed and replaced without affecting the wear sleeve or requiring access to internal retaining rings.
Solution Approach 2:
The drilling tool is divided into distinct modular segments: the backhead assembly containing the distributor, the wear sleeve, and the piston assembly. This segmentation allows each component to be independently maintained and replaced, with the distributor accessible through the open distal end of the backhead.
2Device complexity
If the intake flow path includes sharp bends and restricted areas, then the fluid flow velocity is reduced, but the passageway structure becomes more compact
Solution Approach 1:
The intake flow path is designed with smooth, curved transitions instead of sharp bends. The passageway includes a gradually expanding section that allows fluid to flow from the axial bore to the outer surface of the backhead with minimal turbulence and energy loss, maintaining efficient fluid flow while achieving a compact structure.
3Speed
If the piston area is reduced to allow faster transitions between operational phases, then the transition speed increases, but the power delivery capability decreases
Solution Approach 1:
The piston area is made variable through the adjustable piston assembly. The piston can be positioned at different locations along its travel path, effectively changing the active piston area during operation. This allows the system to optimize between speed and power delivery dynamically, with larger piston area for power-intensive operations and smaller effective area for rapid transitions.
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
Facilitates easier maintenance, reduces energy losses in fluid flow, and increases the piston area, leading to faster transitions and improved operational efficiency, particularly in changing from normal to drop open positions.
Implementation Method 1
The piston is slidably movable along the wear sleeve and the integrated cylinder portion in response to compressed fluid conveyed through the backhead
Data Source
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AI summary
In representative embodiments, a backhead for a drill assembly comprises an elongate member having a proximal end connectible to a source of pressurized fluid, a side wall defining an axial bore and an open distal end. A portion of the bore extending proximally from the distal end has an inner surface defining a cylinder portion shaped to receive an axially movable piston. The axial bore also comprises a check valve receiving area shaped to receive a check valve and to separate, during normal operation when a check valve is received in the check valve receiving area, an inlet area extending proximally to the proximal end from the cylinder portion extending distally to the distal end. Various improvements in retaining the distributor and increasing flow efficiency are described.