1 mechanical and sealed structure and common leak are nodded
Mechanical and sealed Yi Chenduan the face is sealed, its have the end panel of line of runner shaft of a pair of perpendicular Yu Xuan, this end panel is below fluid pressure and the action of the bounce outside compensating machinery, depend on auxiliary and sealed cooperate to maintain joint with another end, relatively slip, prevent medium leak thereby. Mechanical and sealed comprise by two components, it is static annulus, another component runs relatively with its, make in order to achieve the purpose of lowest of sealed leak degree.
Mechanical and sealed sort is more, but more general leak point basically has:
(The sealed; of L) axle sleeve and axis
(2) moves the sealed; of annulus and axle sleeve
(3) moves the sealed; between annulus, static annulus
(4) static annulus and static annulus the sealed; between
(5) between end cover and pump housing sealed.
2 trouble are main case study
2. 1 static try leak
Undertake static when trying, watch leakage rate carefully. Can make preliminary judgement according to leakage rate size. If use annulus or issue of existence of static annulus sealing ring, so leakage rate is minor if; is moved, problem of the existence between static annulus attrition, so leakage rate is older. On this foundation, undertake the hand moves turning to observe again, if leakage rate change is not big, so if be to move,sealing ring has problem; , occurrence problem of static annulus attrition, if use issue of existence of annulus sealing ring,leakage rate has apparent change; , so medium criterion if; of eject of meeting edge axial is static the sealing ring invalidation of annulus, so medium can cool from water Kong Zhonglou goes out or to all around eject. Additional, different discharge dew point also can exist at the same time, but the branch that has primary and secondary commonly, should observe only meticulous, be familiar with a structure, complete likelihood is judged correctly.
2. 2 test-drive leak
Because when test run pump high speed rotates,the high speed of generation rotates centrifugal force, can restrain leak. Accordingly, if the leak when movement, need excludes the account that end reachs to build sealed be no longer in force between the axis first, because move,be for the most part, static annulus chafes deputy suffer destroy be caused by. Cause clash the element of deputy sealed invalidation basically has.
(1) in unit process of cargo bandling, be like,produce all sorts of unusual appearances hold back pressing, cavitation erosion, smoke cool one's heels, had caused great axial power, activity annulus interface is detached, cause divulge;
(2) reduces an amount when installation is mechanical and sealed too big, attrition end panel damages badly, cause divulge;
(3) moves annulus sealing ring to installation loosens too or be tightened too, move link only link end panel is irretentive sealed, cause divulge;
(The hard grain in 4) medium installs foreign matter, the attrition that take a person deputy, make move annulus, static link seal face wears away, cause divulge;
(5) designs type selecting misgivings, major need is torn open afresh outfit, change sealed.
2. Leak of 3 normal movement
Mechanical in movement sealed and abrupt leak, the likelihood because of wear away normally or already reaching service life is very small, because produce,be for the most part the circumstance changes quickly or check of wrong operation, spot does not maintain the account that reach the designated position.
(1) all sorts of unusual operations, if manage to find time, cavitation erosion those who cause is sealed destroy;
(2) medium aerification, like pump actual sendout slants small, medium circulates inside pump in great quantities, quantity of heat is accumulative, cause sealed invalidation;
(3) capacity of returns slants big, arouse container bottom sedimentary meeting attaint is sealed;
(After 4) halts use for long, move turning to be started afresh without the hand, the attrition of adhesion deputy pull; of bad sealing surface
(In 5) medium; of grow in quantity of material of caustic, aggregate sex
(6) environment temperature does not stabilize;
(7) production moves to be not stabilized.
In normal movement, if the machinery of centrifugal pump is sealed discharge leakage is poisonous and harmful, suddenly combustible medium, but personnel of check of make one's rounds fails to discover unusual, seasonable processing, can cause the inestimable loss such as fire, pollution, personal casualty, must give take seriously and adopt be on guard effectively measure.
