| 摘要 |
A The bearing-supported mechanical seal for a progressive including a cylindrical body ( 1 ), manufactured of steel or other materials (optional), with an internal centered sleeve ( 2 ), which fits perfectly the pump shaft/stem ( 3 ). It is equipped with two O-ring sets ( 4 ) for adjustment and sealing. The body ( 1 ) has housings for bearings ( 5 ), equipped with one or more roller bearings that will support all the stem reversions. The bearing-supported assembly seals are made by retainers ( 7 A and 7 B), installed on the roller bearing edges. The sealing assembly has two stationary seats ( 17 ) and one rotary seat ( 19 ), which has a closed lubrication system, composed by one reservoir ( 22 ), two communicating tubes ( 23 ), one pressure gauge ( 24 ) that operates under atmospheric pressure, and one pressure switch ( 25 ). The reservoir also has a drain ( 26 ) for replacing the lubricating oil and one relief valve ( 27 ), which could be opened or not. In the lower region of the mechanical seal, there is a reel for maintenance ( 28 ), equipped with side covers ( 29 ) and a supporting device ( 30 ) of the pump shaft/stem, thus significantly facilitating the disassembly of their components. |
