CN105626540B - Sectional multi-stage centrifugal pump - Google Patents

Sectional multi-stage centrifugal pump Download PDF

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Publication number
CN105626540B
CN105626540B CN201610119473.2A CN201610119473A CN105626540B CN 105626540 B CN105626540 B CN 105626540B CN 201610119473 A CN201610119473 A CN 201610119473A CN 105626540 B CN105626540 B CN 105626540B
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CN
China
Prior art keywords
impeller
pump shaft
stage
sliding bearing
pump
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CN201610119473.2A
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Chinese (zh)
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CN105626540A (en
Inventor
陈拥军
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Shanghai Han Automation Technology Co Ltd
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Individual
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0462—Bearing cartridges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/06—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/185—Rotors consisting of a plurality of wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a kind of sectional multi-stage centrifugal pump, including：Suction casing, first stage impeller, impeller vane, stage casing, secondary impeller, discharge section, pump shaft, axle sleeve, wheel space ring, the sliding bearing being socketed on the outside of axle sleeve, rolling bearing, the elastomeric connector being connected with pump shaft, and the external prime mover of pump shaft rotation is driven by elastomeric connector, it is provided with a plurality of spiral grooves on sliding bearing inwall；Impeller is assemblied on pump shaft by key connection；Impeller vane is assemblied in stage casing, is collected by impeller fluid under pressure by impeller vane and is reduced flow velocity, and pipe-line system is sent into by discharging section discharge.Spiral grooves add volume of fluid circulated on the sliding bearing inwall of the invention; ensure the good lubrication of sliding bearing; to reduce the friction power loss between axle sleeve and sliding bearing and improve the mechanical efficiency of centrifugal pump, and heat caused by friction is taken away between sliding bearing and axle sleeve in time to improve the life-span of sliding bearing and ensure the safe and reliable operation of centrifugal pump.

Description

Sectional multi-stage centrifugal pump
Technical field
The present invention relates to the liquid transportation art such as industry, agricultural, more particularly to a kind of sliding bearing and the section of vertical installation Segmentation centrifugal multistage pump multiple centrifugal pump.
Background technology
Sectional multi-stage centrifugal pump is that multiple impellers are installed into tandem working on a shaft, and impeller number represents pump on axle Series.Sectional multistage pump configuration is generally divided into suction casing, stage casing (middle hop count is that impeller number subtracts 1) and discharges section, each section It is linked to be an entirety with turnbuckle.The suction inlet of sectional multi-stage centrifugal pump arranges in the same direction, and liquid is from previous stage leaf Enter next stage impeller inlet through stator after wheel outflow, energy is increased step by step, most afterwards through discharging section outflow.
Sectional multi-stage centrifugal pump uses vertical mounting design more, saves space, easy for installation.The liquid disengaging of centrifugal pump Not on the same axis, bottom feed liquor, top goes out liquid to mouth, and suction casing, stage casing are connected with discharge section by turnbuckle.Centrifugal pump Connected with motor by elastic coupling, sealing typically uses mechanical seal.Sectional multi-stage centrifugal pump is applied to industry, agricultural The conveying of liquid and urban water supply and sewerage, skyscraper pressurized water supply, fire fighting pressurization, send water and boiler feedwater etc. at a distance.
In the prior art, sectional multi-stage centrifugal pump exist repair it is inconvenient the problem of, maintenance or change sliding bearing and Mechanical seal is very inconvenient, it usually needs the pump housing is dismantled, many difficulties are brought to maintenance.On the other hand, sectional multistage The circular ring structure that copper alloy is generally with sliding bearing that centrifugal pump is adopted, under high-speed cruising or severe duty, due to lubrication Insufficient, sliding bearing is easy to damage due to lubricating insufficient.Mainly have two for the current Curve guide impeller of sliding bearing Individual direction：First, some embedded graphite in copper alloy, improve its wear-resisting and greasy property；Second, number is opened on the inside of sliding bearing Individual straight flute, improve its greasy property by increasing liquid circulation amount.It is right due to embedded in graphite for the first scheme The greasy property of sliding bearing has certain improvement, and the anti-wear performance of bearing also improves, but fails fundamentally to solve to moisten The problem of sliding insufficient.For second scheme, due to the circulation of fluid can be controlled by adjusting the cross-sectional area of groove Amount, the problem of lubrication is insufficient can be fully solved.But sectional multi-stage centrifugal pump is in the course of the work, axle sleeve passes through sliding axle During the straight flute held, without the bearing capacity that enough lubricating film offers are enough, the lubricating film near sliding bearing groove is broken Split, cause the direct contact of solid and solid, so as to produce collision, the frequency that pump shaft axle sleeve and sliding bearing groove collide is pump The rotational frequency of axle axle sleeve and the product of sliding bearing inner wall trench quantity, thus, pump shaft axle sleeve and sliding bearing groove are held The problem of continuous collision will bring some negative：First, the vibrating noise of sectional multi-stage centrifugal pump is caused to increase, second, causing it The sliding bearing life of suction side support declines.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of sliding bearing and sectional multi-stage centrifugal pump, to reduce The noise of centrifugal pump, increases the working life of sliding bearing, and increases the reliability and service life of sectional multi-stage centrifugal pump.
To achieve the above object, technical scheme is as follows：
The invention provides a kind of sectional multi-stage centrifugal pump, including：
Base, suction casing, stage casing, discharge section, prime mover support and the prime mover axially connected successively from the bottom to top；It is described Bearing block is provided with base；Prime mover support is used to connect prime mover and centrifugal pump mechanical part；Described prime mover is made It is used for for prime mover liquid pumping to given height；
Pump shaft, axially it is contained in the suction casing, stage casing and discharge section, the pump shaft is socketed with first stage impeller, secondary Impeller, impeller, axle sleeve and wheel space ring；
Described prime mover is connected by elastomeric connectors such as shaft couplings with the pump shaft, and power is transmitted by the pump shaft To the secondary impeller and first stage impeller, so as to drive the pump shaft to rotate by elastomeric connector described in prime mover driven；
Axle sleeve, it is socketed on the pump shaft close to one end of the bearing block, for preventing the pump shaft from wearing；
Sliding bearing, it is assemblied in the bearing block and is socketed on the outside of the axle sleeve, for slidably supporting the pump shaft, A plurality of spiral grooves are provided with the sliding bearing inwall；
Rolling bearing, it is socketed in close to one end of elastomeric connector on the pump shaft, for pump shaft described in rolling support；
The suction casing is assemblied on the base, and the circulation passage of liquid is runner in the suction casing, the runner Oral area be suction inlet；
The stage casing, which is assemblied among suction casing and discharge section, to be used to assemble impeller vane；
The discharge section is assemblied between the stage casing and prime mover support and is connected with prime mover support, and described Mechanical seal is provided between discharge section and pump shaft；Liquid communication part is runner in the discharge section, the oral area of the runner For outlet；
The first stage impeller is assemblied on the pump shaft by key connection and driven close to one end of sliding bearing, the pump shaft The first stage impeller rotates, so that by the liquid pressing imported from the suction casing and the impeller vane is delivered to, by institute State the risk that first stage impeller has cavitation, the first stage impeller is to sacrifice hydraulic efficiency and special to obtain good cavitation performance The impeller very designed；
The secondary impeller and impeller are assemblied on the pump shaft by wheel space ring axially position.Due to liquid Body is pressurizeed by the first stage impeller, and the secondary impeller does not have the risk of cavitation, therefore the secondary impeller is good to obtain Good hydraulic efficiency and the impeller designed；
The wheel space annulate shaft to being set on the pump shaft, and be axially located the first stage impeller and secondary impeller it Between, between the secondary impeller and secondary impeller and between the secondary impeller and impeller, for separating impeller and protecting Demonstrate,prove axially position of the impeller on the pump shaft；
The impeller vane is radially assemblied in the stage casing, and be radially disposed in the first stage impeller and secondary impeller it Between, between the secondary impeller and secondary impeller and between the secondary impeller and impeller, pressurizeed by the impeller Liquid collected by the impeller vane and reduce flow velocity, and continue to pressurize into next stage impeller.
Wherein, a plurality of spiral grooves are provided with the sliding bearing inwall, and the cross section of the spiral grooves is three Angular or circular arc.
Wherein, the impeller for being assemblied in the suction side is the first stage impeller, and the secondary impeller is located at the chopped-off head leaf Between wheel and mechanical seal, the first stage impeller and secondary impeller are to obtain good cavitation performance and particular design.
Further, the balance that hydraulic equilibrium hole is used for axial force is provided with the first stage impeller and secondary impeller, from Without similar balancing drum device balancing axial thrust.
Wherein, the impeller is separated by the wheel space ring and carries out axially position, and the wheel space ring leads to Back-up ring is crossed to be positioned on the pump shaft.
Further, the base is divided into dismountable support base and bottom, the bearing seat in the support base, The bottom has boss to support the bearing block, thus can be by dismantling the bottom without dismantling the pump housing from bottom Can changes the sliding bearing, is easy to safeguard.
Further, the mechanical seal is set on the pump shaft and between the discharge section and pump shaft, and institute State mechanical seal and locally stretch out the discharge section to facilitate directly from the discharge section dismounting, thus without dismounting pump housing can The mechanical seal is repaired or changed, is easy to safeguard.
Wherein, described prime mover is motor or other kinds of prime mover, and such as internal combustion engine is when using motor, then former dynamic Machine support is electric machine support.
Further, the suction casing circumferentially rotates installation, fluid intake and outlet direction with equal 360 degree of section of discharge It is adjustable, it is adapted to the pipe-line system of different directions installation.
Further, the discharge section uses scroll casing shape structure, on the one hand can improve the efficiency of centrifugal pump, on the other hand Impeller vane described in final stage can be removed, reduce the complexity and product cost of product.
The present invention can adjust liquid circulation amount by sliding bearing by adjusting the cross-sectional area of helicla flute, on the one hand Enough fluids, which can be provided, ensures the good lubrication of sliding bearing, and on the other hand, the fluid of circulation can timely take away cunning Due to heat caused by friction on dynamic bearing, performance and the life-span of sliding bearing are improved, ensures the peace of sectional multi-stage centrifugal pump Full reliability service.
The bearing block of the present invention can be dismantled from the bottom of base, so changing sliding axle without dismounting pump housing can Hold, be easy to safeguard.
The mechanical seal of the present invention can be dismantled directly above discharge section, thus repaired without dismounting pump housing can or Mechanical seal is changed, is easy to safeguard.
The suction casing and discharge section of the present invention can be in circumferential any rotation, it is possible to adapts to a variety of different directions pipelines The installation of system.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment Accompanying drawing is briefly described.
Fig. 1 is the schematic diagram of sectional multi-stage centrifugal pump of the present invention；
Fig. 2 is the schematic diagram of sliding bearing of the present invention；
Fig. 3 is the sectional view of sliding bearing of the present invention；
Fig. 4 is the partial schematic diagram of sliding bearing of the present invention.
Numeral represents in figure：
1. the axle sleeve of 2. bearing block of base 3.
4. the back-up ring of 5. suction casing of sliding bearing 6.
7. the first stage impeller of 8. wheel space ring of pump shaft 9.
10. the secondary impeller of 11. stage casing of impeller vane 12.
13. discharge the bolt of 14. nut of section 15.
16. the shaft coupling of 17. rolling bearing of mechanical seal 18.
19. the suction inlet of 20. motor of electric machine support 21.
22. outlet
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes.
Fig. 1 is the schematic diagram of sectional multi-stage centrifugal pump of the present invention, as illustrated, the sectional multi-stage centrifugal pump of the present invention Specifically include：Base 1, bearing block 2, axle sleeve 3, sliding bearing 4, suction casing 5, back-up ring 6, pump shaft 7, wheel space ring 8, chopped-off head leaf Wheel 9, impeller vane 10, stage casing 11, secondary impeller 12, discharge section 13, mechanical seal 16, rolling bearing 17, shaft coupling 18, motor Support 19 and motor 20, wherein discharge section 13 is connected by the nut 14 of bolt 15 with electric machine support 19, and discharge section 13 and pump shaft 7 Between sealed by mechanical seal 16.
On the basis of sectional multi-stage centrifugal pump is arranged on by base 1 by fastening bolt.Pump shaft 7 is axially contained in suction casing 5th, in stage casing 11 and discharge section 13, pump shaft 7 is socketed with axle sleeve 3 and wheel space ring 8；Sliding bearing 4 is contained in bearing block 2, And it is socketed in the outside of axle sleeve 3；The pump shaft 7 of suction casing 5 is supported by axle sleeve 3 using sliding bearing 4, the pump shaft 7 of the one end of motor 20 Supported using rolling bearing 17；Wheel space ring 8 is positioned on pump shaft 7 by back-up ring 6, and first stage impeller 9 and secondary impeller 12 are logical Cross the axially position of wheel space ring 8 and be assemblied in by key connection on pump shaft 7.
Axle sleeve 3 needs to be assemblied on pump shaft 7, therefore its requirement on machining accuracy is higher；Due to the main work(of wheel space ring 8 Can be the axially position between impeller, therefore its machining accuracy is relatively lower.
Specifically, the first order impeller of sectional multi-stage centrifugal pump suction casing 5 is first stage impeller 9, toward motor drive direction successively With multiple secondary impellers 12, last impeller is impeller, wherein, in order to improve the cavitation erosion of sectional multi-stage centrifugal pump Performance, first stage impeller 9 is particular design, and the design of secondary impeller and impeller is identical.
Impeller vane 10 after first stage impeller 9 is chopped-off head impeller vane, and similarly the impeller vane 10 after secondary impeller 12 is Secondary impeller stator, the impeller vane 10 after impeller is impeller stator, and in order to reduce the complexity of product, impeller Stator is typically designed using identical.
Impeller vane 10 is the energy transmission device of sectional multi-stage centrifugal pump, and its effect is first stage impeller 9, secondary Impeller 12 throws away the liquid come and collected, and makes the flow velocity of liquid reduce, part kinetic energy is changed into after pressure energy again equably Next stage impeller is introduced, impeller vane 10 makes liquid be flowed in continuous streamline channel, is not easy to form dead angle and expands suddenly Dissipate, than more uniform, hydraulic performance is good for liquid velocity change.
Fig. 2-4 is respectively dimensional structure diagram, sectional view and the partial schematic diagram of sliding bearing 4 of the present invention.As schemed Show, be provided with a plurality of spiral grooves 41 on the inwall 40 of sliding bearing 4, spiral grooves 41 can be multiple, and cross section can be with It is triangle or circular arc etc..
Therefore, when sliding bearing 4 of the rotary sleeve 3 of pump shaft 7 Jing Guo spiral grooves 41, at any time, axle sleeve 3 and sliding Have lubrication membrane area enough between dynamic bearing 4 to provide enough bearing capacitys, the loading end of sliding bearing 4 be it is quasi-continuous, Lubricating film between axle sleeve 3 and sliding bearing 4 will not rupture, from situation about directly being contacted without solid and solid, because Without producing extra vibration and noise, and liquid can be circulated by spiral grooves 41, ensure good lubrication；Meanwhile Fluid can rapidly discharge heat caused by friction between the axle sleeve 3 of pump shaft 7 and sliding bearing 4 by spiral grooves 41, improve The service life of sliding bearing 4, so as to improving the reliability of sectional multi-stage centrifugal pump.
According to different load working conditions, can be entered by the cross sectional shape of spiral grooves 41 and size for adjusting sliding bearing 4 Row optimization, ensures enough liquid circulation amounts, it is ensured that sectional multi-stage centrifugal pump safe and stable operation.
According to the requirement of pumped (conveying) medium, corresponding material can be selected in sectional multi-stage centrifugal pump of the invention, as stainless steel, Copper alloy, and highest lift can reach more than 1000 meters.
The pump shaft 7 of the sectional multi-stage centrifugal pump of the present invention is by shaft coupling 18 by the motor that is supported on electric machine support 19 20 direct drives, pump shaft 7 drives first stage impeller 9 and middle multiple secondary impellers 12, liquid pumping to the height specified.Impeller Stator 10 is assemblied in stage casing 11, and first stage impeller 9 and secondary impeller 12 are assemblied on pump shaft 7, and the impeller of pump shaft 7 rotates, from And the liquid pressing that will be introduced from suction inlet 21, after liquid is pressurizeed by first stage impeller 9, collect and reduce by impeller vane 10 Flow velocity continues to pressurize into secondary impeller 12, and the liquid of pressurization, which is collected by impeller vane 10 and reduces flow velocity, enters afterbody Impeller pressurizes, and the liquid after pressurization discharges section 13 by scroll casing shape and discharges feeding pipe-line system from outlet 22；Due to scroll casing shape The cross-sectional area of discharge section 13 gradually increases along export direction, smoothly transits, and flow rate of liquid is gradually reduced, pressure energy increase, its Airflow design ensures that hydraulic loss is smaller, so as to ensure efficient the Hydraulic Design.
According to different lift demands, the quantity of secondary impeller 12 can be from 0 to multiple.If the numerical value of required lift is not It is the integral multiple of Impeller Design lift, can be realized by the diameter of Impeller trim reduction impeller, lift is approximate and impeller is straight Square directly proportional (specific accurate corresponding relation is typically determined by experiment) in footpath.
On the one hand the sliding bearing 4 and sectional multi-stage centrifugal pump of the present invention can ensure due to the effect of spiral grooves Enough liquid circulation amounts, so that it is guaranteed that the good lubrication of sliding bearing 4；Another aspect circulation of fluid can timely take away pump shaft 7 run at high speed between situation properties of journal bearing lubricated 4 and the axle sleeve 3 of pump shaft 7 heat caused by friction, so as to improve the longevity of sliding bearing 4 Life, ensure the safe and reliable operation of sectional multi-stage centrifugal pump.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one The most wide scope caused.

Claims (4)

  1. A kind of 1. sectional multi-stage centrifugal pump, it is characterised in that including：
    Base, suction casing, stage casing, discharge section, prime mover support and the prime mover axially connected successively from the bottom to top；The base Inside it is provided with bearing block；Prime mover support is used to connect prime mover and centrifugal pump mechanical part；Described prime mover is used for handle Liquid pumping is to given height；
    Pump shaft, be axially contained in the suction casing, stage casing and discharge section in, the pump shaft be socketed with first stage impeller, secondary impeller, Impeller, axle sleeve and wheel space ring；Hydraulic equilibrium hole is provided with the first stage impeller and secondary impeller and is used for axial force Balance；
    Described prime mover is connected by elastomeric connector with the pump shaft, and power is delivered to the secondary leaf by the pump shaft Wheel and first stage impeller, so as to by elastomeric connector described in the prime mover driven and drive the pump shaft to rotate；
    Axle sleeve, it is socketed on the pump shaft close to one end of the bearing block, for preventing the pump shaft from wearing；
    Sliding bearing, it is assemblied in the bearing block and is socketed on the outside of the axle sleeve, it is described for slidably supporting the pump shaft A plurality of spiral grooves are provided with sliding bearing inwall；
    Rolling bearing, it is socketed in close to one end of the elastomeric connector on the pump shaft, for pump shaft described in rolling support；
    The suction casing is assemblied on the base, and the circulation passage of liquid is runner in the suction casing, the mouth of the runner Portion is suction inlet；
    The stage casing, which is assemblied among suction casing and discharge section, to be used to assemble impeller vane；
    The discharge section is assemblied between the stage casing and prime mover support and is connected with prime mover support, and the discharge Mechanical seal is provided between section and pump shaft；Liquid communication part is runner in the discharge section, and the oral area of the runner is row Outlet；
    The first stage impeller is assemblied on the pump shaft by key connection and driven close to one end of the sliding bearing, the pump shaft The first stage impeller rotates, so as to by the liquid pressing imported from the suction casing and be delivered to the impeller vane；
    The secondary impeller and impeller is assemblied in by wheel space ring axially position on the pump shaft and the impeller Spacer ring is positioned on the pump shaft by back-up ring；
    The wheel space annulate shaft to being set on the pump shaft, and be axially located between the first stage impeller and secondary impeller, Between the secondary impeller and secondary impeller and between secondary impeller and impeller, for separating impeller and ensureing that impeller exists Axially position on the pump shaft；
    The impeller vane is radially assemblied in the stage casing, and is radially disposed between the first stage impeller and secondary impeller, institute State between secondary impeller and secondary impeller and between secondary impeller and impeller；
    The mechanical seal is set on the pump shaft and between the discharge section and pump shaft, and the mechanical seal is local Stretch out the discharge section and directly discharge section dismounting from described to facilitate, thus without described in the maintenance of dismounting pump housing can or replacing Mechanical seal, it is easy to safeguard；
    The base is divided into dismountable support base and bottom, and in the support base, the bottom has the bearing seat Boss can change institute by dismantling the bottom from bottom to support the bearing block without dismantling pump housing can Sliding bearing is stated, is easy to safeguard；
    The suction casing circumferentially rotates installation with equal 360 degree of section of discharge, and fluid intake and outlet direction are adjustable, are adapted to The pipe-line system of different directions installation；The discharge section uses scroll casing shape structure.
  2. 2. sectional multi-stage centrifugal pump according to claim 1, it is characterised in that be provided with the sliding bearing inwall more Bar spiral grooves, and the cross section of the spiral grooves is triangle or circular arc.
  3. 3. sectional multi-stage centrifugal pump according to claim 2, it is characterised in that the impeller for being assemblied in the suction side is The first stage impeller, the secondary impeller is between the first stage impeller and mechanical seal.
  4. 4. sectional multi-stage centrifugal pump according to claim 1, it is characterised in that described prime mover is motor or internal combustion Machine.
CN201610119473.2A 2015-12-02 2016-03-03 Sectional multi-stage centrifugal pump Active CN105626540B (en)

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CN201510875525.4A CN105351206A (en) 2015-12-02 2015-12-02 Segmentation type multi-stage centrifugal pump
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CN107461339A (en) * 2016-06-03 2017-12-12 苏州赟羽机电科技有限公司 A kind of intelligent centrifugal multistage pump multiple centrifugal pump
CN107575393A (en) * 2016-07-05 2018-01-12 苏州赟羽机电科技有限公司 A kind of sectional type intelligence centrifugal multistage pump multiple centrifugal pump
CN107575392A (en) * 2016-07-05 2018-01-12 苏州赟羽机电科技有限公司 Jing Yin centrifugal multistage pump multiple centrifugal pump
CN107178520B (en) * 2017-08-02 2023-06-23 汪小艳 Method for improving operation efficiency of centrifugal water pump and combined elastic sealing device
CN109185217A (en) * 2018-11-28 2019-01-11 无锡艾比德泵业有限公司 A kind of suction inlet is the water inlet segment structure of the centrifugal multistage pump multiple centrifugal pump of fish mouth type
CN110131215B (en) * 2019-06-05 2024-02-09 广州市昕恒泵业制造有限公司 Flow guiding body structure for pump

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JPH08214495A (en) * 1995-01-31 1996-08-20 Ebara Corp Rotary machine
CN2371372Y (en) * 1999-05-18 2000-03-29 曹伟祥 Handy detachable vertical multi-stage centrifugal pump
CN2434451Y (en) * 2000-07-18 2001-06-13 上海凯泉泵业（集团）有限公司 Ease-to-repair vertical multi-stage centrifugal pump
CN201627724U (en) * 2010-03-19 2010-11-10 上海莲盛泵业制造有限公司 Vertical multi-stage centrifugal pump
CN204226258U (en) * 2014-08-04 2015-03-25 威乐(中国)水泵系统有限公司 Sliding bearing and multistage centrifugal pump
CN205401146U (en) * 2015-12-02 2016-07-27 池泉 Festival segmentation multistage centrifugal pump

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