DEVICE FOR AUTOMATIC CONTROL OF AIR VELOCITY IN MINE VENTILATION Russian patent published in 1994 - IPC

FIELD: mine automatic equipment. SUBSTANCE: device has static-pressure probes and Pitot heads communicated by means of pipes with air-tight body, bellows, flexible cord and ohmmeter. Bellows hollow is communicated with pipe running from static-pressure probe. Flexible cord is made in form of conductive rubber core placed in insulating flexible enclosure, e.g., of rubber or latex. One end of cord is secured to movable rigid base of bellows to ensure electric contact of core with bellows, and the other end of cord is attached to body wall. Core without electric contact is passed through wall and connected with first input of ohmmeter. Second input of ohmmeter is connected with body. EFFECT: higher efficiency. 1 dwg