The system uses two vacuum pumps as its core vacuum source. One pump serves as the roughing pump, responsible for quickly evacuating the drying oven from atmospheric pressure to the initial vacuum stage. The other acts as the high-vacuum pump (fine pump), which maintains and stabilizes the high vacuum level once the initial vacuum is reached. The vacuum pumping logic is illustrated in the diagram below. This design is based on an analysis of the two phases of the vacuum pumping process—the fast pumping phase and the pressure holding phase. By skillfully leveraging the different load characteristics of vacuum pumps at each stage, it achieves optimized allocation of pump resources and reuse of idle time.

Compared with the traditional "one pump, one furnace" configuration, which can only support two drying ovens, this solution uses a single combined roughing and fine pumping system to efficiently meet the vacuum requirements of three or more vacuum drying ovens (piping connection example shown in the diagram). Under the same production capacity requirements, it significantly reduces the total number of vacuum pumps required, achieving dual savings in equipment footprint and energy consumption.

When multiple combined roughing and fine pumping vacuum systems are deployed in parallel, a redundant backup network is built through interconnected butterfly valves on the main vacuum lines. If a vacuum pump in one system fails, the corresponding butterfly valves can be opened to allow other operational pumping systems to take over its vacuum pumping tasks temporarily. This ensures the baking process of cells in the connected drying oven is not interrupted, greatly enhancing the system’s risk resistance and continuous operation capability.

A centralized vacuum supply system integrating main vacuum pipelines, multi-channel high-precision intelligent vacuum valve banks and vacuum transducers is custom-developed. Relying on Dacheng Vacuum’s self-developed cluster control platform, the system executes fully automatic, high-precision sequential control and independent management over pumping, pressure holding and vacuum breaking for every drying oven following pre-set process recipes. It enables an efficient, unattended cyclic operation mode of one pump serving multiple ovens.