CN102080659A - Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump - Google Patents
Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump Download PDFInfo
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Abstract
The invention relates to a sections-distributed-in-pairs twin-volute mine wearable multi-stage pump suitable for conveying sewage with different granules and concentrations in a mine. The sections-distributed-in-pairs twin-volute mine wearable multi-stage pump is characterized in that an effluent stage of the pump is arranged in the middle of the pump, and impeller assemblies at both sides are oppositely arranged, and a final-stage impeller and the middle segment of a final-stage double volute are oppositely arranged. When the pump is provided with an oven number of stages, the impeller assemblies at both sides are symmetrically arranged. When the pump is provided with an odd number of stages, the front impeller assembly is provided with one more pulley. The sections-distributed-in-pairs twin-volute mine wearable multi-stage pump is innovated and improved in the aspects in axial force balance of the pump, the over-current piece and the clearance sealing life of the pump, the diluted oil lubrication of the bearing, circular cooling by utilizing shaft seal leakage, and the like. Accordingly, in the service life of the pump, the axial force of the pump is basically balanced, and residential axial force is borne by angular contact bearings in pair at the back of the pump which keeps long-term high-efficiency operation, and the fault-free working time and the overhaul-period average life of the pump are greatly improved.
Description
Technical field
The invention belongs to the mechanical universal product, pump class, specifically is the mining wear-resisting multistage pump of the opposed double volute of a kind of sections.
Background technique
The widely used main drain pump of China's mine is D type and MD type multistage centrifugal pump at present, a small amount of multistage pump that uses DA type and other patterns, D type pump is the Updated product of DA type pump, its structure is sectional type Fig. 5, the equidirectional order of impellers at different levels (1) is arranged, pumping chambers at different levels (2) are stator formula radially, and the axial force of pump adopts Balance disc mechanism (3) to carry out transient equiliblium.D type pump is the multistage pump by the design of clear water condition, pump industry quality grading regulation, and the time acceptable product of overhaul first were greater than 8000 hours, and high-class product was greater than 12000 hours.At mine use conveying finite concentration, during the sewage of immobilized particles, pump time between failures and life-span overhaul phase all do not reach the industry standard regulation far away.
For improving its service life, coal industry is released MD type＜colliery multistage centrifugal pump 〉, MD type pump is on the basis of D type pump structure, by changing the service life that part flow passage part material improves pump.Coal industry standard code: its operating conditions; Solid particle is not more than 1.5% (volume concentration), granularity is no more than under 6% situation less than 0.5mm, decrease in efficiency: be lower than under the 0.1% clear water condition the no overhaul in 6000 hours of MD type pump operation, the no overhaul in 3000 hours of D type pump operation at solid content; In solid content under 1%～1.5% sewage condition, the no overhaul in 3000 hours of MD type pump operation.
Can find out pump operation by above-mentioned data, increase sharply increase of wearing and tearing along with containing concentration of solid particles.The mine of some condition differences, solid particle is big, concentration is high, life-span overhaul phase of pump has only hundreds of hour.
The axial force of D type and MD type pump adopts the conventional balanced disc mechanism to carry out transient equiliblium, in the startup and stopped process of pump, Balance disc and gimbal produce contact wear, in service at pump, between Balance disc and gimbal, the gap changes comes the transient equiliblium axial force.When the pump conveying contains certain density solid particle, particle enters between Balance disc and the gimbal becomes lapping paste, quickens the wearing and tearing of Balance disc and gimbal, under the serious situation, Balance disc and gimbal have only tens hours life-span, and the time between failures of pump is significantly reduced.
In addition, the return pipe of Balance disc mechanism belongs to slender pipe when conveying contains the sewage of particle, has the situation of cramming to take place, and causes Balance disc and gimbal to kill and does not open, and makes pump off-axis or the generation of other accidents occur.
Use at the pump mine for solving Balance disc mechanism, have the low problem that reaches poor reliability of life-span, developed cancellation Balance disc mechanism, the multistage pump that the impeller symmetric arrangement is arranged.
Opening volute type multistage pump in a kind of level adopts the mode of impeller symmetric arrangement to come balancing axial thrust, and residual axial force is born by thrust-bearing, and its pumping chamber is a spirality, compares with traditional guide vane structure pumping chamber; Hydraulic performance is good/and long, the free from worry easier conveying of runner of life-span contains the sewage of finite concentration solid particle, but has deficiency; When the face of opening in the level is high-lift sealing difficulty, the big inner flow passage complexity of volume, manufacture difficulty pump stage number big, every kind of specification be fix, can not change as sectional type multistage pump progression convenient, to adapt to different operating modes uses.
The multistage coalpump Fig. 6 of OWB type that introduces Poland is adopted in some hydromining ore deposits, and its structure is the sections symmetric arrangement, promptly in the water exit end both sides at pump middle part, symmetric arrangement is set, the impeller sets that impeller quantity equates.Current enter from the inlet segment (1) of pump front portion, by entering the preceding pumping chamber of middle part water exit end after front portion impellers at different levels (2) supercharging, the connecting tube (5) of passing through horizontal arrangement again enters the rear portion inlet segment, and the impellers at different levels (6) through the rear portion are discharged by middle part water exit end (3) after the supercharging.
Pump is in operation, intermediate seal cover (4) both sides exist and are about the pressure difference of always raising half, after the rear portion highly pressurised liquid reduces pressure by the stuffing box gland gap, act on anterior impeller (2) back shroud, pump is at initial operating stage, intermediate seal cover gap is less, and resistance is big, and the middle pressure that acts on the anterior impeller back shroud is also less.The axial force that produces is also less, bear by thrust-bearing, but the pump operation intermediary and later stages, the gap wearing and tearing of intermediate seal cover increase, leakage rate increases, the middle pressure that acts on the anterior impeller back shroud is also more and more higher, and the axial force of generation is far longer than the bearing capacity of bearing, causes the bearing premature damage.The failure-free operation life-span of pump, though increase than conventional balanced disc mechanism service life, also lower.In addition, radially guide vane structure is when carrying the coal water of larger particles, and it is also very fast to wear and tear, and the overhaul phase mean lifetime of pump is also lower.
Preside over design and the patent CN2276572Y that declares by me, overall structure types is with OWB type pump, the scroll casing type structure is adopted in the stage casing, and anterior at the intermediate seal cover, on the impeller back shroud, less seal ring and drain charge hole is set.Preferably resolve the gap wearing and tearing of intermediate seal cover and increase the problem that axial force increases.But because anterior impeller front and rear cover plate seal ring diameter difference, and the front and back impeller is asymmetric, pump is in operation and all has certain additional axial force always, makes bearing, bears extra duty, reduces bearing life.In addition, because take turns and final stage stage casing nonsymmetry last years of a century, increased part specifications quantity, the generalization degree is low, is unfavorable for making and management.
Patent CN2903501Y and CN200946570, therefore its general structure equally exists same problem with OWB type pump with OWB type pump.
Patent CN143980A and CN1811190A overall structure types are with OWB type pump.At the intermediate seal cover, on the anterior impeller back shroud, set up seal ring and drain charge pipe, regularly axial force is carried out dynamic regulation, solve the gap wearing and tearing of intermediate seal cover preferably and increased the problem that axial force increases.But when pump was used for the sewage of mine conveying finite concentration solid particle, radially stator was low than the spiral case life-span, and the orifice plate of elongated in addition drain charge pipe and the throttle valve of regulation and control or small aperture is blocking pipeline easily, and axial force balance was lost efficacy.
Summary of the invention:
The present invention proposes a kind of suitable mine and uses summing up prior art and long-term practice experience, carries the sewage that contains different solid particles and concentration, keep long-term efficient operation, and the life-span is long, the opposed double volute of sections is mining wear-resisting multistage centrifugal pump.
Technological scheme of the present invention is:
One, the general structure of pump
General structural features in mind of the present invention is the sections opposed type, the water exit end of pump promptly is set at the middle part of pump, rotor portion setting in both sides, be contained in the relative impeller sets of impeller inlet on the axle, the stationary part of pump is by forward and backward bearing support, forward and backward inlet segment, forward and backward stage casing group, reach compositions such as pump water exit end, and fastening with the segmentation rod.In the water-output flange and the rear portion inlet segment water-in flange of the anterior water exit end of pump, connect a diameter and import and export identical connecting tube with pump.
Two, the axial force balance of pump
The axial force of pump is to influence one of the bearing life and the principal element in failure-free operation life-span.For preventing the pump operation of symmetric arrangement, in intermediate seal cover gap, after increasing, wearing and tearing cause axial force to increase, impeller symmetric arrangement before and after taking.Seal ring with the front shroud same diameter is set on the impeller back shroud.And forwardly the impeller seal ring and the axle dice between, be provided with the identical equalizing orifice of the number of blade of impeller.Liquid by leak in intermediate seal cover gap enters impeller channel inside by equalizing orifice, and does not act on back shroud of impeller, produces uneven axial force.
When the pump stage number was even number, the rear portion impeller also was provided with the equalizing orifice of equal number, and because of front and back impeller sets symmetric arrangement, axial force is in a basic balance.
When the pump stage number is odd number, anterior many one-levels of impeller sets impeller, the rear portion impeller is not established equalizing orifice, and increasing back sealing ring rises and reduces the purpose of leaking.Because anterior impeller, front and rear cover plate seal ring diameter is identical and establish equalizing orifice, self axial force hydraulic equilibrium.Therefore the axial force that impeller sets produces before and after is hydraulic equilibrium also, and residual axial force is born by being located at the paired contact bearing in rear portion.
Three, the middle segment structure of pump
Scheme one, the stage casing of pump adopt known double flow channel worm frame usually, and it efficiently distinguishes wide.Spiral case does not have interrupted processing, can adopt the higher wear-resistant material of hardness, and the life-span is long, the sewage of suitableeer easy conveying variable grain size and concentration.
Scheme two when sewage contains solid particle less than 0.5mm, can adopt radially guide vane structure when being similar to clear water.
Four, each clearance seal in the pump
Each clearance seal is to influence pump in the pump, keeps one of principal element of long-term efficient operation.Adopt different measure to improve its service life.
1, impeller ring clearance seal
The impeller seals czermak space is the gap of pump inner diameter maximum.Wearing and tearing are that the pump internal clearance is the fastest, and traditional sections multistage pump only is provided with seal ring on the stage casing, and the impeller port ring position is not provided with seal ring.The hard wear resistance of seal ring material is good, but the low quick abrasion of impeller material hardness.Set up the stepped shaft seal ring of good seal performance at the impeller port ring position, and match, and in seal ring, establish the multiple tracks annular seal groove, improve sealing and life-span with seal ring on the stage casing.
2, intermediate seal cover gap sealing
Intermediate seal cover gap, sealing are about half pressure of pump total head, sealing load height.The suitable lengthening of intermediate seal cover, to form by three sections, middle cover can adopt the ceramic material of high hardness wear-resisting.Reverse multi-head spiral seal groove is set on the axle sleeve at rear entry place, stops the minimizing particle to enter in the gap, on intermediate seal cover inwall, more annular seal groove is set.Play two effects: the one, increase hermetic resistance, reduce and leak, and hold particle and reduce and worn and torn in the gap; The 2nd, the pressure that liquid produces in the circular groove has the centering effect to axle, reduces the amplitude of axle.
Five, inter-stage clearance seal
The inter-stage seal clearance, the pressure of sealing one-level impeller, and diameter is less, adopts suitable lengthening to reach at inwall and the multiple tracks annular seal groove is set and adopts high hardness material or cure process.
Six, the axle envelope sealing of pump
The axle envelope sealing of pump is to prevent that leaked liquid leaks in the pump, befouling environment and influence the efficient of pump.Allow the leakage of minute quantity for the ore deposit Pump for well, it is convenient that the Sealing maintenance is changed.
1, the anterior inlet segment axle of pump envelope because of sealing load low (or negative pressure), adopts combination seal, and soft packing or mechanical seal add seal cage and adds the clearance seal cover and seal.The water that feeds seal cage is the leakage water of drawing from the rear portion inlet segment axle envelope of pump, and through former and later two bearing support water cavity post precipitations, it is less to contain solid particle, and pressure carries out water seal (during negative pressure) and reduces the wearing and tearing that clearance seal is overlapped a little more than the circulating water of pump inlet pressure.
2, the rear portion inlet segment axle envelope sealing of pump because of the sealing load height, is about half of pumping head.Particularly pressure is higher for a long time for the pump stage number, adds and contains certain solid particle in the water, and sealing is difficulty.Even use the slag pump also lower, and cost an arm and a leg with the machine envelope life-span.
Adopt compound seal for this reason, leak the direction setting along sewage; The multi-head spiral sealing axle sleeve reduces particle and enters seal clearance, and stuffing box gland is provided with more annular seal groove, increases sealing effect, and wound packages mechanical seal (being equivalent to float ring seal) is set behind the stuffing box gland.Machine is honored as a queen and is provided with annular water chamber, takes over and enters the bearing support cooling bearing, and get back in the pump water inlet section intake chamber.Wound packages machine envelope is not established spring.Specific pressure between rotating ring and the stationary ring is by the pressure reduction of leakage water before and after the machine envelope, so the machine envelope only plays a part to reduce to leak.Moving, the ring of machine envelope adopts the cemented carbide material of high hardness, therefore can use continuously for a long time.Because of the leakage water of annular chamber communicates with the inlet segment intake chamber of bearing support cooling water chamber and pump low pressure, so pressure is lower.Seal with soft packing or machine envelope after the annular chamber, Gland adopts the split type filler of being convenient to change.
Five, the bearing support structure of pump
The multistage pump particularly multistage pump air horsepower of high-lift big flow is big, and the bearing capacity height of bearing, pump reliable operation bearing are crucial, and the bearing of the anterior bearing support of pump adopts the big roller bearing of bearing capacity, bears radial force.The bearing of rear bearings body adopts the double-row angular contact bal bearing of pairing, bears radial force and residual axial force and locatees rotor.
Front and back bearings all adopts the good thin oil lubricant of greasy property and is cooled with circulating water, and improves bearing life.Recirculated cooling water seals in the post-decompression annular chamber from the pump rear axle and draws, enter by the road in the cooling chamber of rear bearing body bottom, flow out by bearing support top, for taking over the convenient fore bearing body top cooling water chamber that directly enters, flow out by bearing support bottom cooling water chamber, the intake chamber of inlet segment low pressure before entering respectively, and front axle water shutoff seal ring is carried out water-stop (during negative pressure).
The flow area of cooling chamber is than big many of pipe, and flow velocity slowed down after cooling water entered cooling chamber.The solid particle meeting sedimentation that contains, so the bearing support bottom does not have the spherical blowdown valve periodical blowdown of straight-through type.Make to enter the front axle envelope, the water of seal cage is cleaning.Minimizing is to the wearing and tearing in stuffing box gland gap.
The bearing support grease chamber is provided with oiling, drain the oil plug and oil ga(u)ge monitoring oil level.Be provided with slinger ring in front and back bearings body inboard, prevent that shaft sealing leakage water from entering in the bearing.The oil chamber is provided with oil sealing and prevents oil leakage.
Six, the water inlet-outlet segment structure of pump
The water-in and water-out section of pump is a pump flow passage part longest-lived, and inlet segment intake chamber runner adopts the half-spiral molded lines to reduce the impact eddy loss of current to axle.Water exit end adopts spiral flow channel to reduce along the journey hydraulic loss.
Description of drawings:
Fig. 1 is an assembly structure figure of the present invention
Fig. 2 is pump intermediate seal cover and front and rear part impeller partial structurtes enlarged view
Fig. 3 is pump front and back bearings body component and axle envelope sealed member partial structurtes figure
Fig. 4 is the double flow channel spiral case and guide vane structure comparison diagram radially
Fig. 5 is traditional sections multistage pump assembly structure figure
Fig. 6 is the OWB pump assembly structure figure of impeller symmetric arrangement
Beneficial effect
The present invention, according to the sewage condition of mine conveying variable grain size, concentration, the innovation of having carried out pump improves, and makes it become the real wear-resisting multistage pump that the mine condition is used that is suitable for.
1, the front and back impeller of pump is provided with the double seal ring symmetric arrangement.And prevent that the gap wearing and tearing of intermediate seal cover from increasing, and be directed at the measure that axial side increases, make the pump axial force all in a basic balance in the lifetime of pump.
2, the double flow channel spirality Crucible shell is adopted in the stage casing of pump, compares the runner spaciousness with guide vane structure, the shape line is reasonable, and hydraulic performance is good, the sewage of easier conveying larger particles and concentration, the double volute locating face is few and do not have interrupted processing, can adopt the wear-resistant material of higher hardness, improves service life.
3, each seal clearance of pump especially seal ring and intermediate seal cover all taked to improve the various measures in life-span, make pump can keep efficient operation for a long time.
4, the bearing of pump adopts the good thin oil lubricant of lubricity, and inserts rear axle and seal the cooling that circulates of post-decompression leakage water.Promptly guaranteed the sealing of axle envelope, the life-span of having improved bearing again.
5, the time between failures of pump and life-span overhaul phase have all obtained bigger raising.
Embodiment
The invention will be further described below in conjunction with accompanying drawing
One, the general structure of pump:
Fig. 1 is a general structure erection drawing of the present invention, and general structural features in mind is the sections opposed type, the water exit end (6) and the horizontally disposed anterior water exit end of one (5) of pump promptly is set, the rotor portion in both sides at the middle part of pump; Setting is contained in the relative impeller sets (3) and (8) of impeller inlet on the axle (11).The stationary part of pump; By forward and backward bearing support (1), (10), forward and backward inlet segment (2), (9), forward and backward stage casing group (4), (7), pump water exit end (6), axle envelope (F), (F of forward and backward inlet segment
*) wait composition, and firm with rod.The anterior water exit end water outlet of pump and rear portion inlet segment water intake link with the pump import and export by diameter identical connecting tube (12).
Two, the axial force balance of pump
Fig. 2 is pump intermediate seal cover and front and rear portions impeller partial structurtes figure.For making pump shaft after equilibrium of forces and the wearing and tearing increase of intermediate seal cover (5) gap, from rear portion impeller (9) back shroud, the high pressure water that leaks overlaps the gap through intermediate seal, after the decompression, act on the back shroud of anterior impeller (2), produce uneven axial force, air horsepower is increased, the bearing premature damage, take following concrete measure:
1, forward and backward impeller (2), (9) symmetric arrangement of the water exit end of pump (6).Promptly on forward and backward impeller back shroud, be provided with front shroud upper sealing ring diameter identical seal ring (3), (8).
2, when the pump stage number is even number, establish equalizing orifice (K), (K at the impeller back shroud of the water exit end both sides of pump
*), because of the axial force of impeller sets symmetric arrangement pump in a basic balance.
3, when the pump stage number is odd number, anterior impeller final stage is established equalizing orifice, and the rear portion impeller is not established equalizing orifice.But anterior many one-levels of impeller sets impeller.Because of anterior impeller front and rear cover plate seal ring diameter is identical, self axial force hydraulic equilibrium.Therefore two groups of impellers before and after, the axial force opposite sign but equal magnitude of generation, promptly axial force is in a basic balance.
4, the quantity of equalizing orifice is identical with the number of blade of impeller, and anterior impeller equalizing orifice, total area are intermediate seal gap and increasing back sealing ring flow area 3～5 times.When the highly pressurised liquid at impeller back shroud place, rear portion by intermediate seal cover (5) gap, the wearing and tearing of special gap increase, leaking increases, impeller increasing back sealing ring annular chamber (H) before flowing to, because equalizing orifice (K) is a wall spare, flow resistance coefficient is very little, can enter impeller channel inside smoothly and can not stop up.Pressure in the chamber and impeller channel internal pressure are basic identical.Therefore the additional axial force of back shroud annular chamber H generation is also less, points to the pump front portion.Anterior impeller sets first stage impeller seal ring is bigger slightly than other secondary impeller seals ring diameters, produce less additional axial force and point to the pump rear portion, so these two additional axial forces is in a basic balance, and promptly the axial force of front and back impeller sets generation is in a basic balance.
In sum, no matter the pump stage number is even number or odd number, and the wearing and tearing increase of pump operation intermediate seal axle sleeve gap, and axial force is all in a basic balance, and residual axial force is born by the paired angular contact bearing that is located at the pump rear portion.
Three, the middle segment structure of pump
Fig. 4 is the double flow channel spiral case and guide vane structure comparison diagram radially, the stage casing normal conditions adopt known pair of turbocharger housing structure (1), it is characterized in that double flow channel axisymmetric layout, any operating mode is moved all radial force hydraulic equilibriums, double volute is compared with guide vane structure (3), and runner spaciousness, hydraulic performance are good, the efficient district of operation is wide.The double volute ratio is adopted in the stage casing, and it is few and do not have intermittently and process, can adopt higher hardness wear-resistant material, life-span height that working surface is compared in the stage casing of being made up of frame (2) and stator radially.Be more suitable for mine and carry variable grain size, the sewage of concentration.
When sewage contains solid particle less than 0.5mm, concentration is low, when approaching clear water, can adopt traditional radially guide vane structure.
Four, each clearance seal in the pump
1, the sealing ring gap sealed picture 2
Seal ring (1) etc. is the gap of each clearance seal diameter maximum in the pump, because of seal ring linear velocity height, quick abrasion, tradition sections multistage pump is only adorned one seal ring on middle piece housing, seal ring is not adorned at the impeller port ring position, because of impeller material hardness low, the sewage that contains solid particle especially, seal clearance very quick-wearing increases, and pump volumetric efficiency is reduced, and the efficient service life phase of pump is short.Set up the stepped shaft seal ring of good seal performance at the impeller port ring position of pump, match with seal ring on the stage casing, and the multiple tracks annular seal groove is set, improve sealing effect at the seal ring inwall.
2, intermediate seal cover gap sealed picture 2
Intermediate seal cover (5) sealing load is about half of pumping head, take intermediate seal cover lengthening, two middle segment lengths nearly, and by three sections levels one-tenth, middle cover can adopt the high-hardness ceramic high-abrasive material, on the axle sleeve at rear seal cover water intake place, multi-head spiral seal groove (7) is set, stop or reduce particle and enter in the seal clearance, more annular seal groove is set on the stuffing box gland inwall, and seal groove plays two effects, and the one, increase hermetic resistance, reduce and leak, and hold particle, reduce wearing and tearing the gap, the 2nd, the pressure that liquid produces in the circular groove, pair effect of axle centering is arranged, reduce the amplitude of axle.
3, inter-stage cover gap sealed picture 2
Inter-stage stuffing box gland (13), the pressure of sealing one-level impeller, and diameter is less, adopts suitable lengthening and at inter-stage cover inwall the multiple tracks annular seal groove is set, and adopts the wear-resistant material or the cure process of higher hardness.
4, the axle envelope sealed picture 3 of pump
(1), the anterior inlet segment axle envelope sealing of pump, because of sealing load low (or negative pressure), adopt soft packing (2) or mechanical seal, add seal cage (3), add clearance seal cover (4) and seal.Feed the sealing water of seal cage, draw by rear portion inlet segment shaft seal cavity (H), cooling bearing and through former and later two bearing support water cavity (S) post precipitations, it is less to contain solid particle, and pressure carries out water seal (during negative pressure) and reduces the wearing and tearing in stuffing box gland gap a little more than the circulating water of pump water inlet section intake chamber (J) pressure.
(2), the rear portion inlet segment axle envelope sealing of pump, because of the sealing load height, be about half of pumping head, particularly pressure is higher for a long time for the pump stage number, adds and contains certain density solid particle in the water, sealing is difficulty.Even it is lower to use the slag pump to seal also the life-span with machine, and costs an arm and a leg.Adopt compound seal for this reason, two sealings before and after dividing, front sealing is along leaking the direction setting; Multi-head spiral sealing axle sleeve (6) reduces the gap that particle enters clearance seal cover (7).Clearance seal is arranged with more annular seal groove, increases sealing effect.Wound packages mechanical seal (being equivalent to float ring seal) is set behind the stuffing box gland.Machine is honored as a queen and is provided with circular groove water cavity (H), takes over and enters the bearing support cooling bearing, and get back in the pump water inlet section water-inlet cavity (J), and therefore (H) cavity pressure is low.Wound packages machine envelope is not established spring, and by the post-decompression leakage water in stuffing box gland gap before the machine envelope, the pressure reduction of the leakage water of (H) chamber low pressure of being honored as a queen with machine obtains.Therefore the specific pressure between rotating ring (8) and the stationary ring (9) is little, and the machine envelope only plays a part to reduce to leak.The dynamic and static ring of machine envelope adopts the cemented carbide material of high hardness.Therefore can use continuously for a long time.The sealing of low pressure is sealed by soft packing or machine envelope after the annular chamber, and Gland adopts split type, is convenient to change filler.
Five, the bearing support structural drawing 3 of pump
Multistage pump is the multistage pump of high-lift big flow particularly, and air horsepower is big, and the bearing capacity height of bearing, pump reliable operation bearing are crucial.The bearing of the anterior bearing support (1) of pump adopts the big roller bearing of bearing capacity to bear radial force, and the bearing of rear bearings body (5) adopts paired angular contact ball bearing, bears radial force and residual axial force and location rotor.
Front and back bearings all adopts the good thin oil lubricant of greasy property, and the circulating water cooling, improves bearing life.Recirculated cooling water is drawn in the post-decompression annular chamber from pump rear axle envelope, enters the cooling chamber (S) of rear bearing body bottom, flows out from top, directly enters fore bearing body upper water cooling chamber for taking over conveniently, is flowed out by the bearing support bottom.The intake chamber (J) and the seal cage that enter anterior inlet segment respectively carry out blanket gas (during negative pressure).
The flow area of cooling chamber is than big many of pipe, and cooling water enters the cooling chamber flow velocity to be reduced, make to contain solid particles sediment, so the bearing support bottom, be provided with spherical blowdown valve (F) periodical blowdown of straight-through type.Make to enter the front axle envelope, the water of seal cage is cleaning, reduces the wearing and tearing to the stuffing box gland gap.
Bearing support grease chamber (Y) is provided with oiling, drain the oil plug and oil level monitoring oil ga(u)ge.In front and back bearings body inboard, be provided with slinger ring (11) and prevent that shaft sealing leakage water from entering in the bearing, the oil chamber is provided with oil sealing (12) and prevents oil leakage.
Six, the water-in and water-out segment structure (Fig. 1) of pump
The inlet segment of pump (1), (9) water exit end (5) (6) are pump flow passage part longest-liveds, reduce hydraulic loss as far as possible.The inlet segment runner adopts the half-spiral molded lines, reduces the impact eddy loss of current to axle.Water exit end of pump (6) and anterior water exit end (5) adopt spiral flow channel to reduce along the journey hydraulic loss.
Claims (7)
1. mining wear-resisting multistage pump of the opposed double volute of sections, general structural features in mind is sections opposed type, Fig. 1, promptly be provided with at the middle part of pump, the horizontally disposed anterior water exit end of water exit end of pump (6) and one (5), the rotor portion in both sides: the relative anterior impeller sets (3) and rear portion impeller sets (8) of impeller inlet that is contained on the axle (11) is set; The stationary part of pump: by forward and backward bearing support (1), (10), forward and backward inlet segment (2), (9), forward and backward stage casing group (4), (7), forward and backward inlet segment axle envelope (F), (f*), and the compositions such as water exit end of pump, and fastening with rod, the water outlet and the water intake of rear portion inlet segment of the anterior water exit end of pump, between connect a diameter with pump import and export identical connecting tube (12) of diameter.
2. according to claim 1, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, impeller, Fig. 2 of described front and back impeller sets, its structure characteristic is front and back impeller symmetric arrangement, back shroud at impeller is provided with the same cover plate for sealing ring (1), (11), seal ring (3), (8) of same diameter; The diameter of the seal ring of the first stage impeller of pump is a bit larger tham the seal ring of each secondary impeller; When the progression of pump is even number, front and back impeller sets symmetric arrangement, and back shroud at the front and rear part impeller, seal ring is beaten quantity to taking turns between the dice, equalizing orifice with the number of blade, the flow area of anterior impeller equalizing orifice (K) is a back shroud, and the 3-5 of sealing ring gap and intermediate seal cover gap flow area doubly; When the pump stage number was odd number, the rear portion impeller was not beaten equalizing orifice, anterior many one-levels of impeller sets impeller.Its functional character is no matter the pump stage number is odd number or even number or the wearing and tearing increase of intermediate seal cover gap, and the axial force that the front and back impeller sets of pump produces is all in a basic balance, and residual axial force is born by the paired angular contact bearing in rear portion.
3. according to claim 1, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, stage casing, Fig. 4 of described stage casing group,
Example 1: known double volute structure (1) is adopted in the stage casing usually, it is characterized in that two volute runners, axisymmetric arranges that any operating mode radial force is hydraulic equilibrium all, and the runner spaciousness, molded lines is reasonable, working surface is few, do not have intermittently processing, can adopt the good material of higher hardness wear resistance.Its functional character be the big small concentration of easier conveying variable grain sewage;
Example 2: when the pumping sewage particulate less than 0.5mm, concentration approaches the clear water condition, can adopt tradition by the stage casing of shell (2) with the combination of stator (3) radially, it is characterized in that many narrow runners, radial force hydraulic equilibrium, working surface are many, return guide vane is intermittently processed, be difficult for adopting the material of higher hardness.
4. according to claim 1, and 2, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, described front and rear portions two impeller sets, the seal ring of impellers at different levels, Fig. 2, (1), (3), (8), (11) etc., its structure characteristic is to remove to adopt traditional sections multistage pump, is provided with outside the seal ring on the stage casing; Position at the choma of impeller is provided with, and with the stepped shaft seal ring of the good seal performance of stage casing seal ring pairing, and at stage casing seal ring inwall the multiple tracks annular seal groove is set, and seal ring adopts the wear-resistant material of high hardness.Its functional character is to improve sealing life.
5. according to claim 1, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, described intermediate seal cover Fig. 2, (5) is characterized in that the sealing load height, are about half of pump total head, adopt the stuffing box gland lengthening, are about two middle segment lengths, and form by three sections; Middle stuffing box gland can adopt the wear-resistant ceramic material of high hardness; The axle sleeve of rear portion water intake (7) is provided with reverse multi-head spiral seal groove, reduces particle and enters seal clearance, at the stuffing box gland inwall more annular seal groove is set.Its functional character: the one, increase resistance, reduce and leak, the 2nd, the pressure that produces in the circular groove has the centering effect to axle, reduces the amplitude of axle.
6. according to claim 1, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, described forward and backward inlet segment axle envelope, (F), (F*) Fig. 3, anterior inlet segment axle envelope, feature is the low or negative pressure (when the pump suction is used) of sealing load, adopt combination seal: add seal cage (3) by soft packing (2) or machine envelope, add clearance seal cover (4) and form; The axle envelope of rear portion inlet segment, it is characterized in that the sealing load height, be about half of pump total head, adopt compound seal: the combination seal of front leaks direction along current, sets gradually reverse multi-head spiral sealing axle sleeve (6), reduces particle and enters seal clearance, add clearance seal cover (7), inwall is provided with annular seal groove, adds plainly-packed mechanical seal (being equivalent to float ring seal), and rotating ring (8), stationary ring (9) adopt the cemented carbide material of high hardness; The back is through compound seal and annular water chamber (H), and post-decompression low-pressure leak water-stop: employing soft packing (10) or machine envelope seal; The middle part of combination seal and back low pressure seal is provided with annular water chamber (H) in front, and takes over to bearing cooling chamber (S) cooling bearing.Its functional character is the sealing that has promptly guaranteed the axle envelope, has cooled off bearing again.
7. according to claim 1, the opposed double volute of a kind of sections is mining wear-resisting multistage pump, described bearing support, Fig. 3, anterior bearing support (1) and rear bearings body (5) is characterized in that adopting the cooling of good thin oil lubricant of lubricity and shaft sealing leakage water cycle; Grease chamber (Y) is provided with oiling, drains the oil and oil level indicator, and slinger ring (11) and oil sealing (12) are set in the bearing inboard; Anterior bearing support adopts the big cylindrical roller bearing of bearing capacity, bears the radial force of rotor, and the rear bearings body adopts paired angular contact ball bearing, bears the radial force and the residual axial force of rotor and locatees rotor; Recirculated cooling water seals annular chamber (H) by rear axle, leads to rear bearing body bottom cooling chamber (S) with pipe, leads to fore bearing body top cooling chamber by top, is expelled to the seal cage (3) and the inlet segment low pressure intake chamber (J) of front axle envelope by the bottom.Its functional character is to improve bearing reliability of operation and life-span.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106235233A CN102080659A (en) | 2010-12-29 | 2010-12-29 | Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106235233A CN102080659A (en) | 2010-12-29 | 2010-12-29 | Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103225623A (en) * | 2013-04-24 | 2013-07-31 | 嘉利特荏原泵业有限公司 | Symmetric radial-splitting multistage centrifugal pump with single casing body |
| CN109654024A (en) * | 2019-01-28 | 2019-04-19 | 浙江科尔泵业股份有限公司 | Double-casing axially split type super-pressure coke cutting water pump |
| CN112196807A (en) * | 2020-09-24 | 2021-01-08 | 欧书鸿 | Self-balancing energy-saving multistage formula water pump |
| CN113544385A (en) * | 2019-03-19 | 2021-10-22 | Ksb股份有限公司 | Sheath pump and method for producing a sheath pump |
| CN117212247A (en) * | 2023-11-07 | 2023-12-12 | 中海(东营)石化有限公司 | Cooling device for pump of high-temperature machine |
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| CN117212247B (en) * | 2023-11-07 | 2024-01-05 | 中海(东营)石化有限公司 | Cooling device for pump of high-temperature machine |
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Application publication date: 20110601 |