Bulb tubular turbine set with runaway protection function

The invention discloses a bulb tubular turbine set with a runaway protection function. The bulb tubular turbine set comprises a bulb body, a shell, guide vanes, a rotating shaft, a main shaft, paddles, a first bevel gear and a second bevel gear. When the unit breaks down and the rotating speed of the main shaft is larger than or equal to the runaway speed, the main shaft drives the second bevel gear to rotate through the transmission assembly, and the second bevel gear rotates to drive the first bevel gear to rotate till the guide vane is reset to the closed state. When the guide vane is reset to the closed state, the pushing part on the rotating shaft pushes the second bevel gear to be separated from the first bevel gear, and the situation that the guide vane is reversely opened by a certain angle due to the fact that the second bevel gear drives the first bevel gear to rotate by an overlarge angle is prevented. When the guide vane is reset to the closed state, the water flow channel is blocked, water flow c