Pressure Exchanger Piston Braking for Wear and Pressure Peaks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pressure exchangers experience wear and inefficiency due to piston collisions with valve plates and abrupt energy loss, leading to maintenance issues and low energy efficiency.
Innovation Solution
Incorporation of a piston braking system with a pressure relief arrangement, featuring thrust pads and conical parts for soft impact and pressure management, along with a floating piston design and lubrication system to reduce wear and maintain energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piston velocity is increased to improve productivity, then the pressure peak increases causing potential damage to the piston or cylinder barrel
Solution Approach 1:
The pressure relief arrangement is pre-configured in the piston to activate when pressure peaks occur during high-velocity operation. This beforehand preparation allows the system to handle sudden pressure increases without structural damage, enabling higher productivity while maintaining safety margins.
Solution Approach 2:
The pressure relief arrangement dynamically changes the pressure parameter within the piston by providing fluid communication between opposite sides when pressure exceeds a threshold. This parameter change prevents destructive pressure peaks while allowing high-velocity operation for improved productivity.
2Reliability
If the piston braking system is used to reduce piston velocity and prevent collisions, then wear is reduced, but pressure peaks occur that may damage the piston or cylinder barrel
Solution Approach 1:
The pressure relief arrangement is merged with the piston structure itself, combining the braking function with pressure management in a single integrated component. This allows the piston to slow down and prevent collisions while simultaneously relieving pressure peaks through internal fluid communication channels.
Solution Approach 2:
The pressure relief arrangement acts as an intermediary mechanism between the piston's kinetic energy and the structural components. By providing fluid communication paths, it mediates the energy transfer and prevents both mechanical impact damage and pressure-induced structural failure.
3Productivity
If the piston stops abruptly to complete the fluid displacement cycle, then the fluid transfer is completed, but kinetic energy is lost and energy efficiency decreases
Solution Approach 1:
The pressure relief arrangement dynamically activates only when needed (during pressure peaks from braking), rather than continuously. This dynamic operation allows the piston to maintain kinetic energy during normal operation for efficient fluid displacement, while providing relief only when pressure becomes excessive, thus balancing productivity with energy efficiency.
4Reliability
If the piston velocity is reduced to prevent collisions with valve plates, then wear and maintenance needs are reduced, but energy efficiency decreases due to loss of kinetic energy
Solution Approach 1:
The pressure relief arrangement is a self-activating feature within the piston that automatically responds to pressure conditions without external control. It serves itself by using the pressure differential to open fluid communication paths, providing wear protection while maintaining energy efficiency through automatic, condition-based operation.
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 effectively reduces wear and maintenance, enhances energy efficiency by managing pressure peaks, and minimizes fluid mixing, resulting in a more reliable and efficient pressure exchange process.
Implementation Method 1
The pressure relief arrangement allows at least temporarily a fluid connection between both sides of the piston (8). Excess pressure can be discharged from a high pressure side to a low pressure side of the piston (8).
Implementation Method 2
a piston braking system and the piston comprises a pressure relief arrangement. The piston braking system allows to decrease the pistons velocity close to one of the end positions
Data Source
Figure 1~5
Figure 6~7
AI summary
A pressure exchanger comprises a cylinder barrel (1), two valve plates (2) and two port plates (3, 4), wherein the cylinder barrel (1) comprises at least one cylinder (7) which accommodates a piston (8). The pressure exchanger further comprises a piston braking system (16,17), wherein the piston (8) comprises a pressure relief arrangement (9).