Rotating speed monitor applied to seawater desalination system

The invention provides a rotating speed monitor applied to a seawater desalination system, the rotating speed monitor comprises a shell and spring pieces, a plurality of guide grooves are uniformly distributed in the upper surface of the shell, one end of each spring piece is fixedly mounted at the bottom of the shell through a clamping plate, and the other end of each spring piece penetrates through the corresponding guide groove; any spring piece corresponds to the unique inherent frequency, and the multiple spring pieces form a discrete and dense speed measurement interval or set to be used for monitoring the rotating speed. The multiple guide grooves are evenly distributed in the upper surface of the shell in a rectangular array mode, the inherent frequency of the multiple spring pieces which are transversely distributed linearly changes, and the inherent frequency of the multiple spring pieces which are longitudinally distributed linearly changes. The rotating speed of equipment such as a seawater desali