Double-cavity piston type gas flow standard unit

摘要: The invention provides a double-cavity piston type gas flow standard unit and relates to the technical field of measuring. comprises cylinder body piston; is in shape long barrel, sealed cavity structure; outer side upper end connected with bracket; bracket fixedly provided step motor; form lower cavities which are independent each other; rod; rod extends outside body; threaded connection lead screw; screw output shaft motor. by solves problems that prior art great space usage inconvenient process, resistance two rods power consumption motor great. has beneficial effects that: one pushes move back forth, capacity can be used for metering, detecting efficiency high, an equipment utilization rate increased, drive small energy sources saved. Metering accurate detected results reliable. compact, simple reasonable structure, usage, convenient saves cost.