Pump Conveying Capacity Control for Constant Temperature-Control Flow
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Solution Overview
Problem
Existing temperature-control systems for molding tools in molding machines are complex and require improved methods for determining the target conveying capacity of pumping systems, which is essential for energy-efficient operation.
Innovation Solution
A method involving controlling the temperature-control volume flow using throttles to maintain a constant flow, measuring the conveying flow, and adjusting the pump's operation to find the target conveying capacity by reducing or increasing the conveying capacity while ensuring the flow remains constant, thereby simplifying the control and regulation of the pumping system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pump is controlled such that at least one throttle is almost completely open to achieve energy-saving operation, then energy efficiency is improved, but the system complexity increases due to added control requirements
Solution Approach 1:
The system automatically determines the target conveying capacity by monitoring whether temperature-control volume flows remain constant during pump operation, eliminating the need for complex external control circuits. The pump system self-regulates to operate at energy-saving points without requiring additional control infrastructure.
Solution Approach 2:
The method changes the operational parameters of the pump dynamically by adjusting the conveying capacity based on detected flow conditions. The pump operates at variable speeds, transitioning between different conveying capacities to maintain optimal energy efficiency while adapting to system conditions.
2Productivity
If the target conveying capacity is determined through complex control circuits, then operational optimization is achieved, but the ease of operation deteriorates
Solution Approach 1:
The pump system automatically determines its own target conveying capacity by monitoring temperature-control volume flows, eliminating the need for complex external control circuits and manual intervention. The system self-regulates to operate at optimal points without requiring additional control infrastructure or operator complexity.
3Use of energy by moving object
If the conveying capacity is reduced to find the target conveying capacity, then energy-saving operation is achieved, but the productivity temporarily decreases during the determination process
Solution Approach 1:
The method temporarily reduces the conveying capacity below the target level to detect whether temperature-control volume flows remain constant, using a partial action approach. This temporary reduction in productivity enables the system to identify the optimal energy-saving operating point, after which normal optimized productivity is maintained.
Data Source
AI summary
A method of finding a target conveying capacity of a pumping includes a temperature-control flow through a temperature-control channel carried out according to a control variable by using a throttle as an actuating element such that a temperature-control volume flow remains substantially constant. A conveying flow of the pumping system is measured, and a pump starting from a starting conveying capacity independent of the control of the temperature-control volume flow is driven such that a conveying capacity of the pumping system is reduced to a reduced conveying capacity. Then, a check is made to find whether the conveying flow remains substantially constant and, if this is the case, the reduced conveying capacity is determined to be the target conveying capacity. If this is not the case despite the control of the temperature-control volume flow, the starting conveying capacity is determined to be the target conveying capacity.