Vacuum Pump System Capacity Control via Segmented Parallel Pumps
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Solution Overview
Problem
Existing vacuum pump systems face challenges in adapting capacity to varying user demands, leading to potential over-design or under-design, energy inefficiency, and increased maintenance costs.
Innovation Solution
A method involving a primary vacuum pump with a variable speed motor and multiple secondary vacuum pumps connected in parallel, with the secondary pumps divided into groups and prioritized for operation based on demand, allowing for flexible capacity adjustment and optimized energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a variable speed vacuum pump is used to adapt capacity to varying demand, then energy efficiency is improved, but the system may still be over-designed or under-designed for changing application requirements
Solution Approach 1:
The vacuum pump system is segmented into multiple independent vacuum pumps instead of using a single variable speed pump. Each pump can be independently controlled and started/stopped based on demand, allowing the system to precisely match capacity to varying requirements without over-design or under-design.
Solution Approach 2:
The system dynamically adjusts its configuration by starting or stopping individual vacuum pumps based on real-time demand measurements. This dynamic reconfiguration allows the system to adapt to changing application requirements while maintaining energy efficiency.
2Adaptability or versatility
If multiple vacuum pumps are connected in parallel with priority grouping, then adaptability to varying demand is improved, but device complexity increases
Solution Approach 1:
Multiple vacuum pumps are divided into priority groups, creating a modular structure that simplifies control logic. The segmentation into groups with different priority levels allows systematic management of pump operations without requiring complex centralized control.
Solution Approach 2:
The system uses measurable parameters (pressure differential, flow demand) to automatically determine which pumps to activate. By changing operational parameters rather than relying on complex scheduling, the system achieves high adaptability with relatively simple control logic.
3Productivity
If secondary vacuum pumps are started at high load to meet peak demand, then productivity is improved, but wear and maintenance costs increase
Solution Approach 1:
The system performs preliminary assessment of demand by measuring pressure differential and flow requirements before activating secondary pumps. This preliminary action allows the system to determine the minimum necessary pump capacity, avoiding unnecessary high-load startup and reducing wear.
Solution Approach 2:
Instead of always starting secondary pumps at maximum capacity, the system applies partial action by activating only the necessary pump capacity based on actual demand. This prevents excessive wear from unnecessary high-load operation while still meeting productivity requirements.
4Productivity
If a single large capacity vacuum pump is used, then productivity is improved, but energy consumption increases during low demand periods
Solution Approach 1:
Instead of using one large vacuum pump, the system segments the total capacity into multiple smaller pumps. During low demand periods, only the necessary number of pumps are activated, reducing energy consumption while maintaining the ability to provide full capacity when needed.
Solution Approach 2:
The system maintains continuous readiness to meet demand by having multiple pumps available, but ensures continuous useful action only when needed. Pumps are activated continuously only during high demand periods, eliminating energy waste during low demand while maintaining productivity capability.
Data Source
AI summary
A method of operating a vacuum pump system, the method including the steps of: operating a primary vacuum pump having a variable speed motor; connecting at least two secondary vacuum pumps in parallel with said primary vacuum pump; dividing the secondary vacuum pumps in groups, each group including at least one secondary vacuum pump; and assigning a priority for each of said groups. The method further includes the steps of measuring the inlet pressure p1, comparing the measured inlet pressure p1 with a predetermined pressure value p0, and if p1 is higher than p0, starting the secondary vacuum pump at a first predetermined startup load Sstartup,1 if it includes a fixed speed motor, and/or starting the secondary vacuum pump at a second predetermined startup load Sstartup,2, if it includes a variable speed motor.