Axial Expansion Hose Piston Dead Space Displacement
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Solution Overview
Problem
High-pressure water pumps with axial expansion hose-diaphragm pistons face inefficiencies due to large dead spaces, which negatively impact volumetric efficiency when handling abrasive fluids, leading to reduced performance and service life.
Innovation Solution
The integration of dead space displacement bodies that either move with the piston or are fixed to the frame, optimizing the design by reducing effective dead space and enhancing wear resistance, thereby improving both volumetric and energetic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial expansion hose diaphragm pistons are used for high-pressure pumping, then wear resistance and robust design are improved, but dead space volume increases which reduces volumetric efficiency
Solution Approach 1:
The invention extracts the harmful dead space volume from the working chamber by introducing displacement bodies that occupy this space. The displacement bodies are positioned in the dead space regions between the piston and cylinder head, effectively removing the compressible fluid volume that causes volumetric inefficiency while preserving the robust diaphragm piston design.
Solution Approach 2:
The invention applies local quality by placing displacement bodies specifically in the dead space regions where they are most needed to improve volumetric efficiency. The displacement bodies are strategically positioned in the compression chambers between the piston and cylinder head, targeting the specific locations where dead space volume compromises performance.
2Productivity
If dead space is reduced to improve volumetric efficiency, then pump performance improves, but the complexity of the piston arrangement increases
Solution Approach 1:
The invention implements self-service by designing the displacement bodies to move automatically with the piston during its stroke. The displacement bodies are either fixed to the piston or are free to move within constraints, allowing them to self-position in the dead space regions without requiring external actuation or complex control mechanisms.
Solution Approach 2:
The invention applies dynamics by making the displacement bodies movable rather than fixed, allowing them to adapt their position during the piston stroke. The displacement bodies can move freely in certain directions while being constrained by the piston and cylinder head geometry, enabling dynamic adjustment to minimize dead space throughout the pumping cycle.
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 implementation of dead space displacement bodies significantly enhances volumetric efficiency by minimizing compressible fluid volume, improving pressure dynamics, and extending the service life of high-pressure pumps, especially when operating with abrasive fluids.
Implementation Method 1
The downward-extending, hollow cylindrical section Z of the axial expansion hose diaphragm piston ASK is axially displaceable within a housing bore GB
Implementation Method 2
High-pressure water pumps with axial expansion hose-diaphragm pistons face inefficiencies due to large dead spaces
Implementation Method 3
The integration of dead space displacement bodies that either move with the piston or are fixed to the frame, optimizing the design by reducing effective dead space
Implementation Method 4
The upper end of the axial expansion hose diaphragm piston ASK is fixed to the frame and surrounds an inlet valve EV... The downward-extending, hollow cylindrical section Z of the axial expansion hose diaphragm piston ASK is axially displaceable
Data Source
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AI summary
The invention relates to a cylinder piston arrangement for an especially volumetric fluid pump or a fluid motor, preferably comprising at least one axial expansion tubular membrane piston defining at least one inner pulsating working chamber. A particular field of application for such pumps or motors is the operation thereof with fluids loaded with extraneous materials, especially abrasive granulated materials. Especially high-speed machines with high working pressures of between a few hundred to a thousand bar are required, the energetic and also volumetric degree of efficiency thus becoming highly important factors. The aim of the invention is therefore to create pumps or fluid motors which are characterised by high degrees of efficiency and long service lives. To this end, at least one clearance driving body (TK1) is actively connected to the pulsating working chamber (AR).