Under normal circumstances, high temperature oil pump seal oil leakage is often caused by the following reasons, take a look at the situation you encounter belongs to which one. If not, please contact our customer service.
(1) the design and selection is wrong, the specific pressure of the sealing end face is low or the cold shrinkage of the sealing material is large. Such as small leakage, mostly moving ring or static ring sealing ring problems; When the amount of leakage is large, it indicates that there is a problem between the friction pairs of dynamic and static rings.
(2) there are granular substances in the working medium, friction pair is entered in the operation, and the end faces of dynamic and static rings are detected;
(3) The seal ring of the static ring is too loose, and when the moving ring floats axially, the static ring breaks away from the static ring seat;
(4) the sealing ring of the moving ring is too tight, and the spring cannot adjust the axial floating amount of the moving ring;
(5) When installing mechanical seal, the compression is too large, resulting in serious wear and abrasion of the end face of friction pair;
(6) During operation, large axial force is caused by abnormal phenomena such as vacuation, cavitation and pressure holding, so that the contact surface of the moving and static rings is separated;
Two: leakage during test run.
(1) The seal between the static ring and the static ring seat;
(2) sealing between dynamic and static rings;
(3) the seal between the moving ring and the shaft sleeve;
(4) the seal between the shaft sleeve and shaft;
. On the basis of preliminary observation of the leakage and judgment of the leakage position, and then manual observation, if there is no significant change in the leakage, there is a problem with the static and dynamic ring seal ring; If there is a significant change in the amount of leakage during turning, it can be concluded that there are problems with the friction pairs of dynamic and static rings; If the leakage medium is sprayed along the axial direction, there are many problems in the moving ring seal ring, and the leakage medium is sprayed around or leaked from the water cooling hole, it is mostly the static ring seal ring failure. Centrifugal gear pump in the normal operation of sudden leakage, if not found in time, often lead to a large accident or loss, we should pay attention to and take effective measures.
(5) The working condition changes or adjusts frequently;
(6) Rapid change of ambient temperature;
(7) corrosive, cohesive and gelling substances increase in the medium. If there is corrosion or gelling substances increase, try to choose
stainless steel gear pump.
(8) For a long time outage, restart without manual car, friction pair due to adhesion and tear sealing surface;
(9) The return flow is too large, resulting in the sediment at the bottom of the suction tube side container (tower, kettle, tank, pool) rising, damaging the seal;
(10) The actual output of high temperature oil pump is small, a large number of medium oil pump internal circulation, heat accumulation, causing medium gasification, leading to seal failure;
(11) vacuum, cavitation or a long time of pressure, resulting in seal damage;
Three: sudden leakage in normal operation. The rest of the leakage is difficult to distinguish and judge intuitively. Only by observing, analyzing and judging the symptoms of leakage on the basis of long-term management and maintenance practice can correct conclusions be drawn.
Generally speaking, the leakage between the shaft sleeve extension, the sealing end cover and the oil pump body is easier to find and solve, but it needs careful observation, especially when the working medium is liquefied gas or high pressure, toxic and harmful gas, relatively difficult. High temperature oil pump in the operation of sudden leakage is a small number of normal wear or has reached the service life, and most of the changes in working conditions or improper operation and maintenance caused. Therefore, the mechanical seal leakage during the test run is basically caused by the damage of the friction pair of the dynamic and static rings after the failure of the seal between the shaft and the end cover. After the installation and debugging of mechanical seals, static test is generally carried out to observe the amount of leakage. Gear pump mechanical seal after static test, the centrifugal force generated by high-speed rotation during operation, will inhibit the leakage of media. Sudden power failure or malfunction shutdown. The above phenomenon often occurs in the test run, and sometimes can be eliminated by appropriate adjustment of the static ring seat, but most need to be re-assembled to replace the high-temperature oil pump seal.
