Hot Mechanical Seals Contact Effect

hot mechanical seals Contact effect

The mechanical seal is a combination of a series of simple design elements, the sealing effect by two flat with the main seal ring to complete, to prevent leakage. One of the sealing rings is rotated together with the shaft, and the other seal ring is fixed to the housing. In order to seal the centrifugal pump shaft, the static seal ring is mounted on the sealing chamber gland. During the rotation of the pump shaft, the sealing surface of the sealing ring mounted on the shaft is rubbed against the opposite static sealing surface. The contact surfaces of the two sealing contacts are similar to bearings and are subject to wear. Any form of system leak must pass through this sealed contact surface. The force acting in the axial direction keeps the seal ring from frictional contact, and its source can be mechanical or hydraulic. In many designs, take the sum of the two. This stable contact prevents leakage from the friction surface or minimizes leakage.

Seat Seat Face contact with the Seal Face, is the main sealing surface, which determines the mechanical seal friction, wear and sealing performance of the key, but also determines the mechanical seal life.

2009.jpg Seal Face is freely movable by spring loading to keep in contact with the Seat. Axial mobility allows automatic compensation for wear, eccentricity and shaft thermal displacement. O-ring auxiliary sealing effect, can play a radial sealing and cushioning effect, so that the entire seal in the radial does not occur rigid contact. In the case of static conditions, the grinding end faces of the moving ring and the stationary ring are in mechanical contact, but when the shaft rotates, the complex friction takes place between the end face and the sealed fluid.

 Mechanical seal structure

Commonly used mechanical seal structure as shown above. (Static ring) 1, a rotating ring (movable ring) 2, an elastic element 3, a spring seat 4, a set screw 5, a rotary ring auxiliary sealing ring 6 and a stationary ring auxiliary sealing ring 8, 7 is fixed to the gland 9 to prevent the stationary ring from rotating. The rotating rings and the stationary rings are also often referred to as compensating rings or non-compensated, depending on whether they have axial compensation capability. Mechanical seal in the fluid may leak the way as shown above, A, B, C, D four channels.

C, D leakage channels are static ring and gland, gland and shell seal between the two are static seal. B channel is the seal between the rotating ring and the shaft, when the end of the friction and wear, it can only follow the compensation ring along the axial micro-movement, in fact, is still a relatively static seal. Therefore, these leakage channels are relatively easy to block. Static seal components are the most commonly used rubber O-ring or polytetrafluoroethylene V-ring, and as a compensation ring ring or static ring auxiliary seal, sometimes with elastic components of the function of rubber, PTFE or metal bellows Structure.