Series Vacuum Pump Control with VSD for Lower Energy Use
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Solution Overview
Problem
Existing vacuum systems consume high power due to constant operation of vacuum pumps at maximum speed to maintain set pressure in a vacuum chamber, despite fast evacuation being unnecessary once the set pressure is achieved.
Innovation Solution
A vacuum system with a Variable Speed Drive (VSD) pump connected in series with another pump, where the first VSD pump operates at higher performance than the second pump to maintain set pressure, reducing the rotational speed and power consumption of the second pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both vacuum pumps are operated constantly at maximum speed, then fast evacuation and pressure maintenance are guaranteed, but high power consumption occurs
Solution Approach 1:
The patent applies dynamic speed control to the first vacuum pump using a variable speed drive (VSD). The pump speed is adjusted based on real-time pressure feedback from the vacuum chamber, allowing the system to maintain set pressure while consuming less energy. When pressure approaches the setpoint, the pump reduces speed; when pressure rises, it increases speed, replacing the static maximum-speed operation with adaptive dynamic control.
Solution Approach 2:
The system implements a feedback control loop where a pressure sensor continuously monitors the vacuum chamber pressure and sends signals to the controller, which adjusts the VSD pump speed accordingly. This closed-loop feedback mechanism ensures pressure maintenance while optimizing energy consumption by matching pump output to actual demand rather than operating at constant maximum capacity.
2Use of energy by moving object
If the first vacuum pump has higher pump rate than the second pump, then energy efficiency is improved, but the system must ensure adequate pressure maintenance
Solution Approach 1:
The first vacuum pump equipped with VSD dynamically adjusts its operating speed to match the actual evacuation demand. During high-demand phases (fast evacuation), it operates at high speed; during low-demand phases (pressure maintenance), it operates at lower speed. This dynamic adaptability allows a smaller pump to effectively handle variable loads, maintaining pressure reliability while improving energy efficiency compared to constant high-speed operation.
Solution Approach 2:
The system changes the operational parameters of the first vacuum pump by controlling its rotational speed through the VSD. By varying the speed parameter according to pressure feedback, the pump delivers appropriate evacuation capacity for each operating condition, ensuring reliable pressure maintenance across different phases without wasting energy during low-demand periods.
Data Source
AI summary
Method to operate a vacuum system includes at least a first vacuum pump and a second vacuum pump wherein the first vacuum pump and the second vacuum pump are connectable to a vacuum chamber to maintain a set pressure inside the vacuum chamber. The first vacuum pump is a Variable Speed Drive pump wherein the first vacuum pump and the second vacuum pump are connected in series. The method includes the steps of controlling the performance of the first vacuum pump and the performance of the first vacuum pump is controlled to be equal to or higher than the performance of the second vacuum pump while maintaining the set pressure in the vacuum chamber.