Mechanical seal for slurry pump

The utility model discloses a mechanical seal for a slurry pump, and particularly relates to a mechanical seal with a primary end surface seal and secondary end surface seal tandem type sealing structure and a cooling flushing structure. The mechanical seal comprises a shaft sleeve, a primary end surface seal, a second end surface seal and the cooling flushing structure, wherein the shaft sleeve is sleeved outside the mechanical seal and rotates together with the same, the primary end surface seal and the secondary end surface seal form the tandem type end surface sealing structure, and the cooling flushing structure is disposed between the primary end surface seal and the secondary end surface seal. The mechanical seal has the advantages that a sealing friction pair adopts hard alloy materials with high hardness, high strength and impact load resistance, the mechanical seal changes an original single-end-surface structure and is a special dual-balance serial connection type mechanical seal structure with external flushing water, and then service life of the mechanical seal can be prolonged by half year to one year. To sum up, the mechanical seal is suitable to be applied to slurry pumps for particle media with high solid content and hardness.