The case study of phenomenon of blowdown pump occurrence leakage

Shandong Hairui Zhonglian Pump Industry Co. , ltd. The blowdown pump that is a major produces manufacturer. When type selecting of client blowdown pump, manufacturer of my company water pump can provide the before-sales service such as price of pump of blowdown pump model, blowdown, in order to offer client reference, and manufacturer of my water pump can provide the service of product of custom-built pump industry for the client. This product information is the knowledge about phenomenon of blowdown pump occurrence leakage:

One, common leakage phenomenon
The scale of mechanical and sealed leakage occupies the 50 % above that maintains pump entirely, what mechanical and sealed moving stand or fall affects blowdown pump directly is normal move, sum up an analysis to be as follows now.
1. periodic leakage
Momentum of change of axial of 1) pump rotor is big, auxiliary and sealed the interference with the axis is big, move annulus to cannot move neatly on the axis. Retroflexion in pump, move, after static annulus wears away, cannot get compensation displacement.
Countermeasure: Assembling when machinery is sealed, axial change momentum of the axis should be less than 0.1mm, auxiliary and sealed answer with axial interference moderate, in make sure radial is sealed while, can agile on the axis shift assures after moving annulus to assemble (move annulus to be pressed to bedspring to be able to be played freely come back) .
The quantity is not worth lube of 2) sealing surface to cause dry clash or pull Mao Mi to seal end panel.
Countermeasure: Face height should add the lube inside oily room antrum to prep above to move, static annulus sealing surface.
3) rotor is periodic oscillatory. The reason is stator and go up, lower end lid is not right medium or impeller and main shaft are lopsided, cavitation or bearing attaint (wear away) , this kind of circumstance can shorten sealed life and generation leakage.
Countermeasure: Can correct afore-mentioned problems according to maintaining a level.
2.Machine of small-sized blowdown pump seals what leakage causes to grind axial phenomenon
Small pump machine seals invalidation to often arise under 1) 7.5kW grind an axis, the position that grind an axis basically has the following: Move annulus to assist bedspring of position of sealing ring place, static annulus, minority to have the appearance that grind an axis.
2) grinds main reason of the axis: Machinery of ① BIA double end panel is sealed, controlling state instead is bad working position, the grain in medium, impurity enters sealing surface very easily, make sealed invalidation. What ② grinds an axis is main be in charge of for balata ripple, and because go up,be carry sealing surface to be in undesirable and lubricant condition, the attrition moment of force between activity annulus is more than balata ripple between canal and axis deliver torsion, produce opposite roll. ③ is moved, static annulus is auxiliary and sealed because get of the weak acid in sewage, weak base corrode, balata already did not have flexibility. Some is cankered already, lost due function, arose to grind axial phenomenon.
3) is solve above problem, take following step now: ① makes sure the cleanness of lower end lid, oily room is spent, prohibit assembling to not clean lube. ② machine seals line of cover of the oil inside oily room antrum to answer sealing surface of annulus of prep above activity. ③ chooses the machine of different structure to seal according to different use medium. Should redesign to soar Cheng pump machine seal a structure, should choose to caustic medium balata be able to bear or endure the fluorine balata of weak acid, weak base. Annulus of machine Feng Jing should be added prevent turn annul.
2, the leakage that arises as a result of pressure
The mechanical and sealed leakage that 1) high pressure and pressure wave cause because spring pressure force and when always passing to exceed 3MPa with force of internal pressure of annular seal space greatly than pressing a design, can make seal face bigger than been press, lilquid film is formed hard, seal face wears away serious, send grow in quantity of quantity of heat, cause sealing surface heat to be out of shape.
Countermeasure: Assembling machine when sealing, bedspring compresses a quantity to must undertake by the regulation, not the phenomenon with too big or too small be patient of, the machinery below high-pressured condition is sealed should take step. To make end panel gets power reasonable, reduce as far as possible be out of shape, can use the data with the compression high intensity such as hard alloy, pottery and porcelain, strengthen cooling lubricant measure.
2) vacuum condition runs the pump of blowdown of mechanical and sealed leakage that cause to be in start, in staying machine course, because pump entrance jams, smoke the account such as gas is contained in sending medium, make annular seal space appears likely negative pressure, inside annular seal space if negative pressure, can cause seal face to do attrition, sealed meeting produces outfit type machine inside flat (water) phenomenon, vacuum is sealed as directional as what pressing sealed differentia to depend on sealed object difference, and mechanical and sealed the adaptability that also has its some way.
Countermeasure: Use machine of double end panel sealed, conduce to improvement so lubricant condition, improve sealed performance.
3, the seepage that poses as a result of medium
1) great majorityBlowdown pumpMechanical and sealed after tearing open solution, static annulus and the auxiliary weather strip that use annulus do not have flexibility, some is already cankered, caused machine a large number of sealed leakage have the appearance that grinds an axis even. Because the weak acid in high temperature, sewage, weak base is right static annulus and move what annulus assists balata weather strip to corrode action, caused mechanical leakage too big, move, material of sealing ring of static annulus balata is fourth nitrile, not high temperature resistant, not acid-proof alkaline, it is when sewage when acidity is alkalescent perishable corrode.
Countermeasure: To caustic medium, balata should choose high temperature resistant, be able to bear or endure the fluorine balata of weak acid, weak base.
The mechanical and sealed seepage that impurity of 2) solid grain poses if solid grain enters seal face, will cut or accelerate seal face wear away, furring and smeary in the axis (set) accumulation speed of the surface exceeds attrition to wear away deputily speed, cause move annulus to cannot compensate displacement of wear and tear, hard deputy to hard attrition movement life should be compared hard deputy to black lead attrition length, because solid grain is met inside the sealing surface of seal ring of built-in black lead.
Countermeasure: The place that enters easily in solid grain should choose carbonization tungsten to chafe to carbonization tungsten deputy machinery is sealed.
4, the mechanical and sealed seepage that poses because of other issue
Mechanical and sealed in return the not quite logical place such as existence design, choice, installation.
1) bedspring compresses a quantity to must undertake by the regulation, not the phenomenon with too big or too small be patient of, error <2mm, compress a quantity to increase end panel comparing to press greatly too, attrition quantity of heat is overmuch, cause sealing surface to heat is out of shape and quicken end panel to wear away, compress a quantity to cross end panel of little movement annulus to be not worth than pressing, criterion cannot sealed. 　　　
The axis that 2) installs the sealing ring that move link (or axle sleeve) end panel and the sealed gland that install static annulus sealing ring (or housing) end panel should pour wine cup and repair light, lest assemble when sealing ring of annulus of the activity that touch an injury.
Thank you to be mixed to the visit of above content very much read! This information is the introduction about phenomenon of blowdown pump occurrence leakage, if you still want to have farther knowledge to this problem, or want to buy this relevant product, contact personnel of my company customer service directly please, my company returns production to suck pump oneself, welcome you at any time seek advice.