DEVICE FOR COORDINATED AUTOMATIC CONTROL OF AXIAL-FLOW FAN DRIVES Russian patent published in 2005 - IPC

FIELD: automatic temperature control of pieces of equipment using air cooling systems with axial-flow fans.

SUBSTANCE: proposed device that can be used for controlling coolant temperature in diesel-generator sets and winding temperature in traction electrical machines of locomotives has control system incorporating mathematical model simulating joint operation of fan impeller and cooling plant supply mains; fan proper with impeller; impeller drive enabling stepless variation of shaft speed; operating mechanism for turning impeller blades designed for stepless variation of blade angle-of-turn; cooling air flow rate computing unit; impeller drive power requirement computing unit; power comparison unit; impeller shaft speed, impeller-blade angle-of-turn, impeller drive input shaft speed, cooling air pressure feed, and temperature sensors. Mathematical model simulating joint operation of fan impeller and cooling plant supply mains is designed to bring cooling air feed in compliance with input setting signal and to generate control action signals applied to inputs of impeller drive and operating mechanism for impeller blades. In addition, mathematical model has program for choosing impeller shaft speed and angle-of-turn of its blades affording maximal efficiency of impeller-drive system at desired feed of cooling air. Power comparison unit is used to compute efficiency of impeller-drive system which equals efficiency of impeller and that of impeller drive.

EFFECT: enhanced economic efficiency of fan impeller-drive system.

3 cl, 3 dwg