subject: The Difficult Problem Of Mechanical Seal [print this page] What side sealing surface vaporization failure phenomenon?
Sealing end surface pV value due to excessive evaporation, or temperature higher pump mechanical seals fins should not take the auxiliary facilities or washing interrupted (filter blockage), and high-temperature pump in the cooling jacket water scaling, cooling down , pump inlet pressure drop caused by the pressure drop in the sealed chamber, the pump light hydrocarbon content of light components increase could all end in the sealing surface of vaporization. For taking the time and sealed with the pump cavity pump cavitation is no different from taking the time, still sealed chamber filled with liquid and no cavitation. Then the failure phenomenon is:
1. Graphite surface even small ring ring grooves;
2. Hard Rings 1c. 13 surfacing alloy, the surface also appeared grooves;
3. Hard with a tungsten carbide ring when the polished surface of a local, in hot water and light hydrocarbon media also sometimes appear grooves;
4. Hard ring surface "bonding" small pieces of graphite, the small pieces of graphite to graphite ring groove milled surface.
Sealed cavity cavitation has more features rivet?
Sealed cavity cavitation is generated in the intense mechanical seals around the hydraulic oscillation, led to rapid sealing of the axial reciprocating motion to seal was severely damaged. Cavitation damage to the extent of the mechanical seals, taking the time to be much more serious than the pump. Because cavitation is accompanied by vaporization, so taking the time to pump mechanical seal failure when the phenomenon of cavitation in the sealed cavity may also occur. There are also the following phenomenon occurs when one of the following phenomena are sealed cavity cavitation results.
1. Static ring from the bit or anti-resale bent;
2. Ring ring (4F-V-shaped) lip curling occurred:
3. Ring is "pumped" to the driving seat to get stuck in, spring loss of function;
4. Friction cut with a brittle material with time (such as silicon carbide), the sealing end face for "percussion" and patches of flaking.
Taking the time to which the pump mechanical seal failure phenomenon occurs?
In front of light from a single seals are wear marks, analyze the reasons for failure. Practical work, often after failure, several mechanical seals are wear marks. One reason the failure phenomenon which occurs, the following should be aggregated, comprehensive analysis of various phenomena, which quickly and accurately determine the reasons for failure, easy to improve their work. Taking the time to mechanical seals the pump failure which will appear a phenomenon? Taking the time to refer to the so-called pump impeller cavitation occurred or there is no liquid pump, and leak into the gas or liquid vaporization, etc., then sealed in 1000, or semi-1000 friction state.
1. Graphite ring and deep rough surface of the annular grooves;
2. Hard-surfacing alloy ring with 1cr13 or sprayed ceramic surface, the emergence of radial crack;
3. The hard part consistent with the tungsten carbide hard alloys, there ring grooves, sometimes show a radial crack or break;
4. Stationary ring are degenerate, so the rubber ring is aging, cracking, if it is 4F-V-ring then becomes sallow, serious 2 4F ring bonded together;
5. Thermal loading ring alloy ring mechanical seals loose.
