Three-rotor flow meter convenient to disassemble and assemble

A connecting pipe is fixedly arranged on the left side and the right side of a flowmeter body, a guide sleeve is fixedly arranged on the outer wall of the connecting pipe, a sealing air bag ring is fixedly arranged on the left side of the guide sleeve, a piston ring is arranged on the outer wall of the connecting pipe in a sliding mode, and a butt joint pipe is fixedly arranged on the right side of the piston ring. According to the three-rotor flow meter beneficial to disassembly and assembly, firstly, the internal thread sleeve is rotated, rotation of the internal thread sleeve along the guide sleeve is facilitated, after the internal thread sleeve is in contact with threads on a medium pipeline in the prior art, threaded connection can be achieved, and secondly, in the rotating process of the internal thread sleeve, the internal thread sleeve is in threaded connection with the guide sleeve. The butt joint pipe can drive the piston ring to slide along the guide sleeve and the connecting pipe, air in the guid