Working principle and structure of deep well pump mechanical seal

Working principle and structure of deep well pump mechanical seal
A deep well pump mechanical seal is a dynamic seal formed by a set of sealed end faces. Many types of mechanical seals, but the working principle is basically the same. Mechanical seal mainly by the four major components: the ring 2 and static ring 1 composed of the main dynamic seal, moving two together with the pump shaft rotation, stationary ring fixed in the gland 3 | anti-rotation pin 9 to prevent it from turning, (B, C, D) used O-shaped or V-shaped seals 7 and 8 of the composition of the auxiliary dense. Component; the other side of the sealing surface, By the spring 4 and other components of the compression element _ by the drive seat 5 and the key or fixed pin 6 and other components of the dynamic components.
Mechanical seals typically have four possible leak points, B, C, and D. Seal point A in the ring and static ring contact surface, it is mainly by the pump fluid pressure and spring force will be moving ring | attached to the static ring, to prevent the A point of leakage. But the two rings of the contact surface A there will always be a small amount of liquid leakage, it can form a liquid on the one hand to prevent leakage, on the other hand can play a lubricating effect. To ensure the two sides of the end of a good fit, both ends straight and smooth. The sealing point JB is between the stationary ring and the gland, which is a static sealing point. With a flexible O-shaped (or V-shaped) ring pressure between the stationary ring and the gland, the spring force by the elastic seal deformation and seal. The sealing point C is located between the moving ring and the shaft, and it is also a static seal, and a V-shaped seal having elasticity and self-compactness can be used in consideration of the axial movement of the moving ring. The sealing point D is also a static seal between the sealing box and the gland. A sealing ring or a gasket may be used as the sealing member. _ From the structural point of view, the mechanical seal will be easy to leak the shaft seal, instead of more difficult to leak the static seal and end face radial I. I. seal. By the dynamic ring surface and the static ring end surface of the radial contact dynamic seal is to determine the mechanical seal performance and life key.