Hydraulic turbine mechanical seal flushing structure

The utility model relates to a hydraulic turbine mechanical seal flushing structure which comprises a pump body, a pump shaft and a pump cover connected to one end of the pump body, an overflowing cavity is formed in the pump body, and an impeller is arranged in the overflowing cavity. A suction inlet and a water outlet of the impeller are communicated through an impeller runner; a mechanical seal is slidably connected to the pump shaft at the free end of the pump cover, and a mechanical seal cavity is formed between the mechanical seal and the pump cover; the mechanical sealing cavity is communicated with the overflowing cavity; a first flushing flow channel is formed between the impeller flow channel and the overflowing cavity, a second flushing flow channel is formed in the mechanical seal, and the second flushing flow channel is communicated with a low-pressure area outside the pump body. According to the utility model, the flushing medium which flushes the mechanical sealing cavity is introduced into a l