CN201526512U

CN201526512U - Slag slurry pump blade fluid power balance combined seal

Info

Publication number: CN201526512U
Application number: CN2009200652029U
Authority: CN
Inventors: 李豪; 毛小琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-10
Filing date: 2009-07-10
Publication date: 2010-07-14
Anticipated expiration: 2019-07-10

Abstract

The utility model relates to a slag slurry pump blade axial-force balance and fluid power balance combined sealing device, comprising an impeller, a blade, a blade back cover plate, a first-level auxiliary blade, a secondary auxiliary blade, a last-level auxiliary blade, a seal seat, a multi-level radial sealing clearance, a multi-level axial sealing clearance, a balance hole, an impeller hub, an axle, an axial sleeve and an axial seal, wherein the multi-level auxiliary blade is combined with the multi-level radial sealing and balance hole with good sealing performance and axial force balance performance and the solid particle is effectively prevented from entering into the axial seal in service and pressure and wear at the axial sealing position is greatly reduced and the service life of the axle is prolonged.

Description

Slurry pump impeller fluid dynamic equilibrium combination seal

Technical field

The utility model relates to a kind of slurry pump impeller axial force balance and hydrodynamic seal, belongs to a kind of centrifugal type slurry pump and dynamic seal apparatus that adopts multistage back blades and equalizing orifice combination.

Background technique

The slag stock pump is used to pump the slurry that contains solid particle, this slurry weares and teares to pump housing axle Feng Youqiang, axle seals the inefficacy that is easy to grind away, general slag stock pump adopts the pump impeller back shroud that the one-level back blades is set, and cooperate one on axle, to connect with impeller, but the sub-propeller that suction port is opposite with impeller, be combined to form by back blades and sub-propeller and form reverse balance pressure with impeller and reduce an envelope place pressure, and when pump operation, stop solid particle to enter an envelope place, simultaneously back blades is in operation and drives the slurry rotation and have the place's pressure effect of the back shroud of impeller of minimizing, whereby the total axial force on the effect of a balance part and the impeller.But this back blades and sub-propeller combination, axial dimension is long, has increased the axle suspension brachium, the pump operation poor stability; Sub-propeller also needs to cooperate with corresponding sub-propeller cavity in addition, component are many, assembling is very difficult with maintenance, moreover, because the boosting of sub-propeller makes back blades place pressure rise, back shroud of impeller pressure rises thereupon, the function of back blades balance part axial force is weakened, and descends greatly even total failure in back blades wearing and tearing back sealing effect, balancing axial thrust effect.

Summary of the invention

Problem to be solved in the utility model is with a kind of cascade back blades form, form multistage back blades function, between every two neighboring pole ladder, locate all to have a radial clearance seals, this species stage back blades has had multistage axial seal and multistage warp-wise seal combination, has good sealability, effective prevention solid particle in service enters an envelope place simultaneously, the pressure and the wearing and tearing at axle envelope place have been significantly reduced, prolonged the life-span of axle, can be designed to the plane of inclination for increasing the multistage back blades of sealing effect, offering several equalizing orifices on the back shroud of back blades and wheel hub adjacent communicates with former impeller suction port, being used for balance back blades sealing effect after wearing and tearing descends the balancing axial thrust effect after balancing axial thrust weakens.

The utility model solves its technical problem and adopts following technology: the utility model is by impeller, blade, back shroud of impeller, the chopped-off head back blades, secondary back blades, the final stage back blades, sealing seat, multistage radial seal gap, multistage axial seal gap, equalizing orifice, impeller hub, axle, axle sleeve, the axle envelope is formed, according to structure situation, progression can reach 5 grades at most, minimum is 2 grades, gap form between back blades and the sealing seat can be designed to 90 °, greater than 90 ° or less than 90 ° tilting, or the combination in any between the three, impeller blade is contained on the back shroud of impeller, multistage back blades is contained on the back shroud of impeller, back shroud of impeller is contained on the impeller hub, there is axis hole to connect on the wheel hub with pump shaft, axle sleeve is contained on the axle, axle is encapsulated in the cavity between sealing seat and the axle sleeve, impeller blade, multistage back blades, back shroud of impeller, wheel hub, axle consists of revolving part, and sealing seat is a fixed block.

When the utility model is in running state; when being the revolving part rotation; the slag slurry sucks from the impeller blade suction port; discharge by the impeller blade exhaust port; slag slurry between the radially multistage and multistage axial clearance between multistage back blades inside and the sealing seat also produces rotation simultaneously; produce the hydrodynamic pressure gradient; reduced the active force that acts on the back shroud of impeller; produce and the reverse pressure of impeller blade simultaneously; stoped solid particle to enter the axle envelope; played the balancing axial thrust effect, after longer back blades and sealing seat wearing and tearing working time, radial clearance; axial clearance increases; sealing effect reduces; this wheel hub pressure is higher, is higher than PIP, and slurry will have on a small quantity by equalizing orifice inflow suction eye this moment; flowing of this part slurry will make an envelope place pressure basic identical with impeller inlet; axial force obtains further balance, and solid particle flows into suction eye and do not enter the axle envelope simultaneously, and the axle envelope is protected.

Multistage back blades that the utility model provides and equalizing orifice combination sealing arrangement can all have good sealing, balancing axial thrust effect under normal condition and serious wear situation.

Description of drawings

Fig. 1 is 3 grades a overall construction drawing for the utility model back blades,

Fig. 2 is 2 overall construction drawing for the utility model back blades,

Fig. 3 is not equal to the multistage back blades structural drawing at 90 ° of tilt angle for the utility model back blades,

Fig. 4 is the different combination assumption diagram in each inter-stage tilt angle of the utility model back blades.

Embodiment

The utility model is by impeller blade inlet 1, impeller blade 2, impeller blade outlet 3, back shroud 4, sealing seat 5, axle envelope 16, axle sleeve 17, wheel hub 18, equalizing orifice 19, axle 15, chopped-off head back blades 8, chopped-off head radial clearance seals 6, chopped-off head axial clearance sealing 7, secondary back blades 11, secondary radial clearance seals 9, secondary axial clearance sealing 10, final stage back blades 14, final stage radial clearance seals 12, final stage axial clearance sealing 13 is formed, impeller blade 2 is contained on the back shroud 4, and back shroud 4 is contained on the wheel hub 18, and wheel hub 18 is contained on the axle 15 together with axle sleeve 17, chopped-off head back blades 8, secondary back blades 11, final stage back blades 14 all is contained on the back shroud 4, axle envelope 16 is contained between axle sleeve 17 and the sealing seat 5 impeller blade 2, back shroud 4, chopped-off head back blades 8, secondary back blades 11, final stage back blades 14, axle sleeve 17, axle 15 can together rotate for forming same rotary component, and sealing seat 5 is for maintaining static part, between chopped-off head back blades 8 and sealing seat 5, form chopped-off head radial clearance seals 6 and chopped-off head radial clearance seals 7, between secondary back blades and sealing seat 5, form secondary radial clearance seals 9 and secondary axial clearance sealing 10, between final stage back blades 14 and sealing seat 5, form final stage radial clearance seals 12 and final stage axial clearance sealing 13, between final stage back blades 14 on the back shroud 4 and wheel hub 18, have several equalizing orifices 19.

The utility model with said structure can be achieved as follows function:

The utility model device is in when static; blade 2; radial clearance seals 6; 9; 12 and axial clearance sealing 7; 10; all be full of slurry in 13; when axle 15 rotations, drive axle sleeve 17; blade 2; back shroud 4; chopped-off head back blades 8; secondary back blades 11; final stage back blades 14 together rotates; slurries flow and pressure are progressively improved to blade exit 3 from blade inlet 1 under the blade effect in the blade 2; slurry in each seal clearance is under back blades effects at different levels simultaneously; flow to chopped-off head back blades radial clearance 6 directions by wheel hub 18 places; make that like this axle envelope 16 place's pressure are very low; even negative pressure appears; axle envelope 16 places do not have the solid particle wearing and tearing; simultaneously so mobile generation kinetic pressure; make the pressure that acts on the back shroud 4 reduce; reach the effect of balancing axial thrust; continuous increase along with working time; each radial clearance between each back blades and the sealing seat 5; each axial clearance is owing to wearing and tearing increase; sealing effect and axial force balance effect reduce; when the pressure that acts on wheel hub 18 places can be increased to greater than equalizing orifice 9 opposite side blade suction ports 1 place pressure; slurry flows to blade import 1 by equalizing orifice 9; even axial force obtains balance; axle envelope 16 places also do not contain solid particle simultaneously, reach the effect that balancing axial thrust and protection axle envelope are avoided abrasion of particles equally.

Claims

1. slurry pump impeller axial force balance and hydrodynamic seal device, by impeller blade inlet (1), impeller blade (2), impeller blade outlet (3), back shroud (4), sealing seat (5), axle envelope (16), axle sleeve (17), wheel hub (18), equalizing orifice (19), axle (15), chopped-off head back blades (8), chopped-off head radial clearance seals (6), chopped-off head axial clearance sealing (7), secondary back blades (11), secondary radial clearance seals (9), secondary axial clearance sealing (10), final stage back blades (14), final stage radial clearance seals (12), final stage axial clearance sealing (13) is formed, impeller blade (2) is contained on the back shroud (4), back shroud (4) is contained on the wheel hub (18), wheel hub (18) is contained on the axle (15) together with axle sleeve (17), chopped-off head back blades (8), secondary back blades (11), final stage back blades (14) all is contained on the back shroud (4), axle envelope (16) is contained between axle sleeve (17) and the sealing seat (5), impeller blade (2), back shroud (4), chopped-off head back blades (8), secondary back blades (11), final stage back blades (14), axle sleeve (17), axle (15) can together rotate for forming same rotary component, sealing seat (5) is for maintaining static part, between chopped-off head back blades (8) and sealing seat (5), form chopped-off head radial clearance seals (6) and chopped-off head axial clearance sealing (7), between secondary back blades and sealing seat (5), form secondary radial clearance seals (9) and secondary axial clearance sealing (10), between final stage back blades (14) and sealing seat (5), form final stage radial clearance seals (12) and final stage axial clearance sealing (13), go up between final stage back blades (14) and the wheel hub (18) at back shroud (4) and have several equalizing orifices (19).

2. slurry pump impeller axial force balance according to claim 1 and hydrodynamic seal device, it is characterized in that a kind of cascade back blades form, form multistage back blades function, between every two neighboring pole ladder, locate all to have a radial clearance seals, this species stage back blades has multistage axial seal and multistage warp-wise seal combination, the maximum Pyatyis of progression, minimum secondary, the gap form between back blades and the sealing seat can be designed to 90 °, greater than 90 ° or less than 90 ° tilting.