SUPPLYING AND DISCHARGING AIR CONTROL SYSTEM FOR KEEPING PLURALITY OF CHAMBERS IN SAME AIR SYSTEM IN SPECIFIED INDOOR PRESSURES RESPECTIVELY

摘要

PURPOSE:To obtain the supplying and discharging air control system, capable of keeping a plurality of chambers in the same air system in the specified indoor pressures respectively and saving energy by supplying suction air whose amount is equal to the amount of discharging air. CONSTITUTION:The amounts of discharging air of respective chambers are set by airflow amount setters S1, S2, S3 respectively. The total amount Q2 of discharging air is discharged by an exhaust fan V2 to the outside of the system. The indoor pressures of respective chambers X1, X2, X3 are reduced as the air of respective chambers is discharged, however, the opening degrees of variable airflow valves 71, 72, 73 for returning air are reduced gradually with a predetermined delay in accordance with pressure difference detecting signals of pressure regulators P2, P3, P4 to reduce the amount of air returning from respective chambers into an air chamber V3 by an amount matching with the discharging amount Q2. The indoor pressure of the air chamber V3 is reduced, however, the opening degree of the variable airflow valve 41 for suction is adjusted by the pressure difference detecting signal of the pressure regulator P1 through a regulator c1, suction, whose amount is equal to said discharging air amount Q2, is effected, and the specified amount of air is supplied to respective chambers, whereby, the indoor pressures of respective chambers X1, X2, X3 may be kept in the specified pressures without being affected by each others.