Double Piston Pump Axial Control Shreds Solids
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Solution Overview
Problem
Double piston pumps used for conveying highly viscous media face issues with abrasive wear, maintenance, and the inability to filter out foreign bodies due to clogging, as existing designs are not equipped to handle solids and impurities effectively.
Innovation Solution
A double piston pump design featuring axially displaceable control pistons with wave-shaped circumferential openings in cylinder liners, which creates a scissor mechanism to shred solids and generates a pressure pulse for sedimentation, allowing for continuous operation with reduced wear and filtration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional piston pumps are used for conveying highly viscous media with solids, then the pump can transport the medium, but abrasive wear occurs and maintenance is required
Solution Approach 1:
The control piston is made axially displaceable to dynamically change the fluidic connections between working chambers, enabling the pump to adapt to different operating conditions and reduce wear through optimized piston positioning
Solution Approach 2:
The pump is divided into multiple working chambers that can be independently controlled through the axially displaceable control piston, allowing selective operation of chambers to reduce cumulative wear on individual components
2Productivity
If conventional piston pumps operate continuously, then productivity is maintained, but wear increases and maintenance is needed
Solution Approach 1:
The control piston automatically adjusts the fluidic connections between working chambers based on the operational state, enabling the system to self-regulate and reduce wear without external intervention during continuous operation
Solution Approach 2:
The axially displaceable control piston creates periodic changes in fluidic connections between working chambers, allowing regular rotation of wear patterns across multiple chambers to extend overall component life during continuous operation
3Reliability
If sieves or filters are used to remove foreign bodies, then filtration is achieved, but the media clogs the filtering elements
Solution Approach 1:
The control piston extracts and isolates foreign bodies from the media stream by creating separate fluidic paths, allowing solids to be removed without clogging filtering elements while maintaining continuous media flow through the pump
4Ease of operation
If the control piston moves axially to change working direction, then suction and pressure modes are switched, but wear on the control piston increases
Solution Approach 1:
The control piston incorporates locally optimized features such as wave-shaped circumferential openings in cylinder liners that create scissor mechanisms to shred solids, reducing abrasive wear on specific contact areas while maintaining effective control piston operation
Solution Approach 2:
The axial movement of the control piston, which could cause wear, is combined with wave-shaped openings that create beneficial scissor mechanisms to shred solids and reduce wear on other pump components
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 design reduces abrasive wear, enables continuous operation with minimal maintenance, and allows for effective filtration of solids and foreign bodies, ensuring reliable and low-maintenance operation while maintaining high suction power and pressure capabilities.
Implementation Method 1
due to the wave shape, a scissor mechanism is activated when the control piston is moved from one position to another. The highly viscous medium, and in particular solids or clumps in the medium, are broken down and removed from the liner according to the scissor principle.
Implementation Method 2
When the control piston is moved from one position to the other to change the working direction of the respective double piston, a pressure equalization occurs from the pressure side or overpressure side to the suction side or underpressure side. This pressure equalization is controlled in particular according to the invention in such a way that a short pressure pulse occurs. This pressure pulse sediments any solids present
Implementation Method 3
This pressure pulse sediments any solids present, in particular foreign bodies and particularly preferably stones or petrified materials, so that they sink into the suction chamber located at the bottom
Implementation Method 4
The radially circumferential openings of the cylinder liners are particularly designed to have a circumferential wave-like shape. This offers two advantages according to the invention... due to the wave shape, a scissor mechanism is activated when the control piston is moved
Data Source
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AI summary
The invention relates to a double-piston pump (1) for conveying highly viscous media, comprising two arranged pistons (8, 9), each piston (8, 9) being driven by a drive, and an axially displaceable control piston (13) which is arranged in a base housing (2). According to the invention, the base housing (2) is provided with three working chambers (4, 5, 6), the working chambers being separated by the control piston (13), such that two working chambers (4, 5) are fluidically connected to each other and the further working chamber (6) is fluidly separated from these.