Pressure control system for a vacuum chamber, vacuum pumping unit provided with such a system

摘要

The invention concerns a system for regulating pressure in a chamber (1) containing effluents, connected by pipes (2) to a pumping unit (3) comprising a self-lubricating mechanical primary pump (4) and at least a secondary pump (5). The invention is characterised in that the system comprises a speed regulator (6) controlling simultaneously the rotation speeds of the self-lubricating mechanical primary pump (4) and of the secondary pump (5).