First, the basic situation:

E-GA301 pump GSB model of vertical high-speed pumps, Institute of Aerospace Manufacturing Industry Corporation XI. By the motor, accelerator, pump, forced lubrication system, sealing liquid circulation system and other components.

Growth accelerator for the two gears, input shaft speed of the motor speed 2950R / M, the output shaft speed 10275R / M, two seal with a different form. On the seal (ie, input shaft seal) for the lip seal (lip seal rubber skeleton), under seal (ie, output shaft seal) for the mechanical seal, the code is: 60C, there are lubricants accelerator built by the forced lubrication system, circulation, mechanical seal on the lower part of the lubrication, cooling.

Pump part of the seal in two series of mechanical seals, mechanical seal, code-named the top 60B, the lower mechanical seal, code-named 60A. Seal between the two sets of mechanical seals sealed chamber filled with oil, in the sealing liquid supply circulation system (including a sealed tank) for circulation to the mechanical seal lubrication, cooling.

By the following three sets of mechanical seal components: rotating ring, stationary ring, thrust ring, spring, spring seat, auxiliary ring, snap ring and so on. Vertebral ring, spring, spring seat and clasp, secondary seals have "O" shaped rubber ring and PTFE wedge ring, stationary ring materials are graphite (M106K). The ring material is different, 60A and 60C of the ring were made by the carbide YG6, and 60B of the ring, the base material for the OCRL8N112M02TI, surfacing in the sealed end of the surface layer thickness is 1.5MM carbide.

Second, the mechanical seal leakage analysis:

High-speed accelerator pump and pump a cavity between the leakage of oil and seal oil have accumulated here, lead to the pump by the in vitro discharge hole of the oil cup. The pump is put into use since then, there is oil leakage flow to the oil cup, every 3-5 days on the need to pump additional oil tank accelerator. 1-2 months after the operation, began to deteriorate sealing performance mechanical seals, seal oil leaking, oil tank inside the cup and seal the color into the black oil, and began to have sneaked into the sealed chamber into the sealed acrylic and oil tank cup, pump vibration increased, a large number of the last propylene leak, resulting in high pressure sealing oil tank alarm and parking. The disintegration of high-speed pump, it was discovered 60B mechanical seal stationary ring seal face has been damaged, the end face a sticky ring around the black graphite, 60A wear more serious, 60C is only slightly worn.