Device for prolonging service life of dynamic and static rings of water wheel ring type self-priming pump

The utility model discloses a device for prolonging the service life of a dynamic ring and a static ring of a water wheel ring type self-priming pump. The device comprises a buffer tank, a liquid inlet pipe and a liquid supply pipe, the liquid inlet pipe and the liquid supply pipe are respectively communicated with the interior of the buffer tank and are respectively connected with a liquid inlet pipe flange and a liquid supply pipe flange; the position of the liquid inlet pipe is higher than that of the liquid supply pipe; the liquid inlet pipe is connected with an external cooling liquid input pipe through a liquid inlet pipe flange, and the liquid supply pipe is connected with the water wheel ring type self-priming pump through a liquid supply pipe flange. By means of the water-wheel ring type self-priming pump, stable water supply of the water-wheel ring type self-priming pump can be achieved, a one-way valve does not need to be additionally arranged on a liquid inlet pipe opening of the water-wheel ring