Single screw vacuum pump five sealed basic components
Single screw vacuum pump five sealed basic components
Functions and requirements of the five main sealing elements of a single screw vacuum pump:
End seal pair (static and moving ring). The function of the sealing pair of the end face is to make the sealing surface tightly fit and prevent the leakage of medium. It requires the static and moving ring to have good wear resistance, the moving ring can move flexibly in axial direction, automatically compensate the wear of sealing surface, make it fit well with the static ring; The static ring is buoyant and ACTS as a buffer. Therefore, the sealing surface requires good processing quality to ensure the sealing pair has good fitting performance.
Elastic element (spring, bellows). It mainly plays the role of compensation and buffering, the requirement always maintain enough elasticity to overcome the inertia of the auxiliary seal, the friction of the transmission part and the moving ring, etc., to ensure the good fitting of the sealing pair of the end face and the tracking of the moving ring, the material requirements of corrosion resistance, fatigue resistance.
Auxiliary sealing (o-ring, v-ring, u-ring, wedge-shaped ring and special-shaped ring). It mainly plays the sealing role of static ring and moving ring, and also plays the role of floating and buffering. The sealing element of the static ring is required to ensure the sealing between the static ring and the gland and the floating of the static ring. The sealing element of the moving ring can ensure the sealing between the moving ring and the shaft or sleeve and the floating of the moving ring. The material requires heat and cold resistance and compatibility with medium.
Transmission element (drive pin, drive ring, drive seat, drive key, drive lug or tooth insert connector). It plays a role in transferring the torque of the shaft to the rotor ring. The material requires wear resistance and corrosion resistance.
Fastener (set screw, spring seat, gland, assembly sleeve, shaft sleeve). It plays the role of static and moving ring positioning and fastening, requiring correct axial positioning, ensuring a certain amount of spring compression, making the sealing surface of the sealing pair in the correct position and keeping a good fit. At the same time, it is convenient to disassemble and assemble, easy to be in place and can be reused. With the auxiliary sealing fit, the installation of sealing ring should have guide chamfering and pressure elastic quantity, ya zhi red mechanical and electrical technology remind should pay special attention to the moving ring auxiliary seals and shaft sleeve match the requirements of wear and corrosion resistance, if necessary, with the shaft sleeve can use hard surface coating.
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