The invention relates to an
electricity generation device for an oil
gas pipeline monitoring system, belonging to the field of oil
gas pipeline monitoring and piezoelectric
electricity generation. The
electricity generation device is characterized in that a left end cover is arranged at the outer side of a pipeline; a shell is fixed between the left end cover and a right end cover; a piezoelectric
transducer is sleeved on the inner wall of the shell, and the piezoelectric
transducer is formed by adhering a
metal base plate and a piezoelectric
crystal plate; different
magnetic poles of a pair of fixed magnets are oppositely arranged on the free end of the piezoelectric
transducer; a main shaft is arranged on the left end cover and the right end cover through a bearing; an
impeller is arranged on a main shaft end and placed in a pipeline; and a main shaft spline is sleeved with a
magnet ring 1 and a
magnet ring 2 which are provided with protruded teeth and opposite
radial polarization directions. In the invention, the
kinetic energy of an oil gas is converted into
electric energy by utilizing the piezoelectric transducer, and therefore, reliable and sufficient energy can be obtained without paving cables or batteries; and the piezoelectric transducer is excited in a non-contact way and protected through two-way magnetic
coupling action, and therefore, high reliability is achieved and higher
electricity generation capacity is achieved during high rotating speed, lower rotating speed and constant rotating speed of the main shaft.