A high-viscosity gear pump shaft extension end sealing structure and sealing method

Abstract

The application discloses a high-viscosity gear pump shaft extension end sealing structure and sealing method, belongs to the field of rotary machinery sealing, and has a tooth-shaped seal and a chamber in a sealing body. A rotating shaft passes through the tooth-shaped seal and the chamber in sequence and is matched with a tooth-shaped seal gap to form a non-contact seal. At least two packing rings made of expanded graphite are arranged in the chamber and sleeved on the rotating shaft. A gas passage for feeding high-pressure gas into the chamber is arranged on the sealing body. The expansion degree of the packing ring is controlled by adjusting the temperature of the high-pressure gas, so that the packing ring is in frictional contact with the rotating shaft, a solid-liquid mixed phase of graphite powder and lubricating oil is formed, the gap between the packing ring and the rotating shaft is filled and sealed, and the sealing is completed. The graphite fine powder is first generated by the contact and friction between the rotating shaft and the packing ring, the graphite fine powder is mixed with lubricating liquid to form a solid-liquid mixed phase, the solid-liquid mixed phase is filled into the gap between the rotating shaft and the sealing body, and the composite sealing of the shaft extension end is realized in cooperation with the gas seals and the tooth-shaped seal on both sides.

Images