What are the structures of particle wear-resistant mechanical seals for pumps

The particle wear-resistant mechanical seal for the pump adopts a double mechanical seal structure, and the pressure of the sealing fluid is higher than the medium pressure. The sealing liquid enters the two contact sealing planes from the outer circumference of the end faces of the mechanical seal, and its leakage trend is internal leakage.The sealing friction pair is made of tungsten carbide vs tungsten carbide, which can have the same width.At this time, since the hardness of the sealing friction pair is higher than that of the solid particles, the end faces will not be worn or slapped.The two hard rings at the medium end and the seat are tightly fitted with a heat sleeve, which is beneficial to conduct the frictional heat of the end faces to the metal seat, so as to reduce the temperature of the surface of the sealing friction pair of the mechanical seal.The hard ring at the atmospheric end adopts a floating structure sitting on the O-ring, which can avoid thermal cracking caused by the combined action of the internal stress caused by the interference fit and the friction heat of the end faces of the mechanical seal.The two structures have their own characteristics. In any case, it is important to reduce the temperature of the end faces of the sealing friction pair by cooling.To this end, the sealing liquid is circulated and cooled, and cooling water is passed through the inner side of the stationary seat at the atmospheric end to increase the cooling effect. Here, the following remarks are also required:

①Due to the high operating pressure, the balance structure is adopted on both end faces of the mechanical seal, and two rings are used for the auxiliary sealing rings of the rotary face and the stationary seat, which can ensure reliable sealing of the mechanical seal.
②The push ring  and the support ring  are divided into two parts (usually as one), which is beneficial to the floating of the rotary face.
③The auxiliary sealing rings of the rotary face and the shaft sleeve are relatively static seals, but the axial vibration frequency is high, and the V-ring wears the shaft sleeve greatly, so the contact part of the shaft sleeve is sprayed with ceramic or hard chrome to increase the wear resistance.
④ The stationary seat clamped by the double O-rings may not be provided with anti-rotation pins.