Pressure Exchanger Adjustable Stop for Reliable Start-Up
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Solution Overview
Problem
Pressure exchangers face challenges in starting operation due to insufficient fluid pressure, leading to high leakage and the need for large, costly motors to overcome initial friction, which results in inefficient energy use.
Innovation Solution
An adjustable stop arrangement is implemented between the pressure shoe and the cylinder drum to limit movement and gap size, allowing for reliable start-up with minimal leakage and reduced friction during operation, using an adjustable stop element that rotates with the cylinder drum and is adjustable from outside the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If springs are used to press the pressure shoe against the port flange during start-up, then leakage is reduced, but friction force increases significantly requiring a large torque motor
Solution Approach 1:
The stop arrangement is positioned in advance to limit the pressure shoe movement to a predefined maximum gap distance before start-up. This preliminary constraint ensures that during start-up, the pressure shoe cannot move away from the port flange by more than the stop arrangement allows, thereby maintaining sufficient contact pressure without requiring additional springs, thus avoiding excessive friction forces.
Solution Approach 2:
The stop arrangement acts as an intermediary mechanical element between the pressure shoe and the housing. It mediates the position of the pressure shoe, allowing controlled movement while preventing excessive separation. This intermediary structure enables reliable start-up with minimal leakage without directly increasing the friction force between the pressure shoe and port flange.
2Reliability
If a large torque motor is used to overcome starting friction, then start-up is achieved, but energy consumption increases and the motor is not operated at optimum point
Solution Approach 1:
The stop arrangement is pre-positioned to constrain the pressure shoe movement before start-up occurs. By limiting the maximum gap to a predefined small distance, the system ensures that sufficient contact pressure is maintained during start-up without requiring excessive motor torque, thereby reducing energy consumption and allowing the motor to operate near its optimum point.
3Reliability
If the pressure shoe is held tightly against the port flange, then leakage is minimized, but friction increases causing wear
Solution Approach 1:
The stop arrangement defines a specific geometric parameter - the maximum gap distance between the pressure shoe and port flange. By controlling this dimensional parameter, the system achieves an optimal balance: the gap is small enough to prevent excessive leakage but large enough to allow the pressure shoe to be held by fluid pressure alone, minimizing friction and wear during 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
Enables cost-effective operation by reducing the required motor torque and energy consumption, maintaining minimal leakage and friction during normal operation while ensuring reliable start-up.
Implementation Method 1
During operation, i.e. once the pressure exchange has started, the pressures on the pressure shoe and the forces resulting from these pressures are balanced, so that the pressure shoe is held with a sufficient force against the port flange
Implementation Method 2
A first fluid having a high pressure is supplied to one side of the cylinder drum and enters a cylinder of the cylinder drum via the port flange. This first fluid transfers its pressure to a second fluid in the cylinder.
Data Source
AI summary
A pressure exchanger (1) including a housing (2), a drive shaft (3) and a cylinder drum (4) rotatably arranged in the housing (2) is described, the cylinder drum (4) including two front faces and at least one cylinder (5) between the front faces, wherein the housing (2) includes a port flange (7, 8) at each end of the cylinder drum (4) and at least at one end of the cylinder drum (4) a pressure shoe (18) is arranged between the cylinder drum (4) and the port flange of this end. Such a pressure exchanger should be operated in a cost-effective manner. To this end an adjustable stop arrangement (19) is arranged between the pressure shoe (18) and the cylinder drum (4).