CN105526194B - Adjustable vane device and sectional multi-stage centrifugal pump - Google Patents
Adjustable vane device and sectional multi-stage centrifugal pump Download PDFInfo
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- CN105526194B CN105526194B CN201610041787.5A CN201610041787A CN105526194B CN 105526194 B CN105526194 B CN 105526194B CN 201610041787 A CN201610041787 A CN 201610041787A CN 105526194 B CN105526194 B CN 105526194B
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- impeller
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Classifications
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- 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
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/466—Fluid-guiding means, e.g. diffusers adjustable especially adapted for liquid fluid 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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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- 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 for being provided with adjustable vane device, including：Suction casing, first stage impeller, adjustable vane device, stage casing, secondary impeller, discharge section, pump shaft, axle sleeve, wheel space ring, sliding bearing, rolling bearing, elastomeric connector, and external prime mover；Impeller is assemblied on pump shaft by key connection；Adjustable vane device is assemblied in stage casing, is collected by impeller fluid under pressure by adjustable vane device and is reduced flow velocity, and pipe-line system is sent into by discharging section discharge.The adjustable vane device of the invention adjusts the angle of stator according to the pressure of exit of pump, thus water pump all operates in efficiency optimization operating point under any operating mode, improve the hydraulic efficiency under water pump sub-load and excess load operating mode, improve water pump system, the particularly operational efficiency of frequency conversion or flow-changing water pumping system, save water pump system energy consumption.
Description
Technical field
The present invention relates to the liquid transportation art such as industry, agricultural, more particularly to a kind of adjustable vane device and use the dress
The vertical installation sectional multi-stage centrifugal pump put.
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 inlet segment, stage casing (middle hop count subtract 1 for impeller number) and water exit end, each section
It is linked to be an entirety with turnbuckle.Sectional multi-stage centrifugal pump suction inlet arranges in the same direction, and liquid is from preceding one stage impeller
Enter next stage impeller inlet through stator after outflow, energy is increased step by step, most flowed out afterwards through water exit end.
Sectional multi-stage centrifugal pump uses vertical mounting design to save space more, easy for installation.Water pump inlet and outlet do not exist
On same axis, bottom water inlet, top water outlet, and inlet segment, stage casing and water exit end are connected by turnbuckle；Water pump and motor
Pass through elastic coupling（Usually shaft coupling）Connection；Sealing typically uses mechanical seal.Sectional multi-stage centrifugal pump is applied to
Industry, the conveying of agricultural liquid and urban water supply and sewerage, skyscraper pressurized water supply, fire fighting pressurization, it is remote send water and boiler to
Water etc..
In addition, with industrial expansion, environmental pollution is increasingly severe, thus the requirement to carbon emission is more and more stricter,
This just forces product constantly to upgrade, and constantly provides energy-efficient solution.In water pump system field, currently used side
Method is to use converter technique, and converter technique is made that very big contribution to water pump system energy-conservation, however the design of water pump be according to
Rated point optimization design（I.e. in metered flow, the efficiency highest of water pump）, it is when water pump deviates rated point work, i.e., negative in part
Under lotus and overload conditions, its is less efficient, and deviation metered flow is more remote, and its efficiency declines more.
The purpose of the present invention is for less efficient under existing sectional multi-stage centrifugal pump sub-load and overload conditions
Technological deficiency, it is proposed that a kind of adjustable vane device, and the new sectional multi-stage centrifugal pump using the adjustable vane device.
Wherein, adjustable vane device adjusts the angle of stator according to the pressure of exit of pump, thus water pump is in any operating mode
Under all operate in efficiency optimization operating point, improve the hydraulic efficiency under water pump sub-load and excess load operating mode, improve water
Pumping system, particularly frequency conversion or the operational efficiency of flow-changing water pumping system, save water pump system energy consumption.
The content of the invention
To achieve the above object, the invention provides a kind of adjustable vane device, it is used to be believed according to water pump discharge pressure
Number regulation guide vane angle, thus improves operational efficiency of the water pump under sub-load and overload conditions, it includes：Driving dress
Put, feedback signal processor, Poewr transmission mechanism, helical gear shaft, driving gear, stator and driven gear, the feedback signal
Processor receives the pressure signal that water pump discharge pressure sensor transmits and by processing, so that it is determined that the deflection of the stator
Angle；Wherein, the drive device is connected by the Poewr transmission mechanism and drives the helical gear shaft, the helical gear shaft
Connection is engaged with the driving gear by gear, the driven gear engages connection with the driving gear, the stator with
The driven gear connection.
The adjustable vane device adjusts the angle of stator according to the pressure of exit of pump, thus water pump is under any operating mode
Efficiency optimization operating point is all operated in, improves the hydraulic efficiency under water pump sub-load and excess load operating mode.
For given the Hydraulic Design, pressure and flow are that one-to-one, i.e., different pressure correspond to different stream
Amount, different flows corresponds to different impeller liquid exit velocities, when the angle of stator is consistent with fluid issuing velocity attitude,
Hydraulic loss is minimum, hydraulic efficiency highest.Adjustable vane device is according to pressure sensor（It is typically mounted at exit of pump）Feedback
Signal adjustment stator angle, so as to ensure under any operating mode, water pump all optimization efficiency point run（Water pump discharge pressure
With the relation of guide vane angle, typically emulated and determined and through overtesting amendment by waterpower）.
Present invention also offers a kind of sectional multi-stage centrifugal pump for including above-mentioned adjustable vane device, it includes：
Base, inlet segment, stage casing, water exit end, 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 used
In liquid pumping to given height；
Pump shaft, axially it is contained in the inlet segment, stage casing and water exit end, 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 connector with the pump shaft, and power is delivered to described time by the pump shaft
Level impeller 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, 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 the elastomeric connector on the pump shaft, for described in rolling support
Pump shaft；
The inlet segment is assemblied on the base, and the circulation passage of liquid is runner in the inlet segment, the runner
Oral area be suction inlet；
The stage casing, which is assemblied among inlet segment and water exit end, to be used to assemble above-mentioned adjustable vane device, and it includes：Drive
Dynamic device, feedback signal processor, Poewr transmission mechanism, helical gear shaft, driving gear, stator and driven gear, the feedback
Signal processor receives the pressure signal that water pump discharge pressure sensor transmits and by handling, so that it is determined that the stator
Deflection angle；Wherein, the drive device is connected by the Poewr transmission mechanism and drives the helical gear shaft, the spiral
Tooth axle engages connection with the driving gear by gear, and the driven gear engages connection with the driving gear, described to lead
Leaf is connected with the driven gear；
The water exit end is assemblied between the stage casing and prime mover support and is connected with prime mover support, and described
Mechanical seal is provided between water exit end and pump shaft；Liquid communication part is runner in the water exit end, the oral area of the runner
For outlet；
The first stage impeller is assemblied on the pump shaft close to one end of the sliding bearing, the pump shaft by key connection
The first stage impeller is driven to rotate, so as to by the liquid pressing imported from the inlet segment and be delivered to the adjustable vane dress
Put；
The secondary impeller and impeller are assemblied on the pump shaft by wheel space ring axially position；
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 secondary impeller and impeller, for separating impeller and ensureing leaf
Take turns the axially position on the pump shaft；
The adjustable vane device is radially assemblied in the stage casing, and is radially disposed in the first stage impeller and secondary impeller
Between, between the secondary impeller and secondary impeller and between secondary impeller and impeller.
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.
Further, it is provided with the balance that hydraulic equilibrium hole is used for axial force in the first stage impeller and secondary impeller.
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.
Wherein, the mechanical seal is set on the pump shaft and between the water exit end and pump shaft, and the machine
Tool sealing is local to stretch out the water exit end to facilitate directly from water exit end dismounting, thus without the can maintenance of the dismounting pump housing
Or the mechanical seal is changed, it is easy to safeguard.
Wherein, described prime mover is motor or other kinds of prime mover, such as internal combustion engine.
Further, the inlet segment circumferentially rotates installation, fluid intake and outlet direction with equal 360 degree of water exit end
It is adjustable, it is adapted to the pipe-line system of different directions installation.
Further, the water exit end uses scroll casing shape structure.
The present invention adjusts the angle of stator using adjustable guide vane mechanism according to the pressure of exit of pump, improves water pump part
Hydraulic efficiency under load and excess load operating mode, improve the fortune of water pump system, particularly frequency conversion or flow-changing water pumping system
Line efficiency, save water pump system energy consumption.
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 dismantle directly from water exit end above, thus without dismantle pump housing can repair or
Mechanical seal is changed, is easy to safeguard.
The inlet segment and water exit end 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 cross section structure diagram of sectional multi-stage centrifugal pump of the present invention；
Fig. 2 is the dimensional structure diagram of adjustable vane device of the present invention；
Fig. 3 is adjustable vane device helical gear shaft of the present invention and driving gear engaging structure schematic diagram.
Numeral represents in figure：
1. the axle sleeve of 2. bearing block of base 3.
4. the back-up ring of 5. inlet segment 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 adjustable vane device 12.
13. the bolt of 14. nut of water exit end 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. the feedback signal processor of 1001. drive device of outlet 1002.
The driving gear of 1003. Poewr transmission mechanism, 1004. helical gear shaft 1005.
The driven gear of 1006. stator 1007.
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.
As shown in figure 1, the sectional multi-stage centrifugal pump of the present invention specifically includes：Base 1, bearing block 2, axle sleeve 3, sliding axle
Hold 4, inlet segment 5, back-up ring 6, pump shaft 7, wheel space ring 8, first stage impeller 9, adjustable vane device 10, stage casing 11, secondary impeller
12nd, water exit end 13, mechanical seal 16, rolling bearing 17, shaft coupling 18, electric machine support 19 and motor 20, wherein water exit end 13 are logical
Cross the nut 14 of bolt 15 to be connected with electric machine support 19, and sealed between water exit end 13 and pump shaft 7 by mechanical seal 16；Enter
The circulation passage of liquid is runner in water section 5, and the oral area of runner is suction inlet 21；Liquid communication part is stream in water exit end 13
Road, the oral area of runner is outlet 22.
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 inlet segment
5, in stage casing 11 and water exit end 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 inlet segment 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；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.
Adjustable vane device 10 after first stage impeller 9 is chopped-off head adjustable vane device, similarly adjustable after secondary impeller 12
Vane apparatus 10 is secondary adjustable vane apparatus, and the adjustable vane device 10 after impeller is final stage adjustable vane device, and
In order to reduce the complexity of product, adjustable vane device is typically designed using identical.
Adjustable vane device 10 is the energy transmission device of sectional multi-stage centrifugal pump, its effect be 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 equal again after pressure energy
Next stage impeller is introduced evenly, and adjustable vane device 10 makes liquid be flowed in continuous streamline channel, is not easy to form dead angle
With unexpected diffusion, than more uniform, hydraulic performance is good for liquid velocity change.
Fig. 2 is the schematic diagram of adjustable vane device of the present invention.Feedback signal processor 1002 receives exit of pump first
The pressure signal and process that pressure sensor transmits are handled, so that it is determined that the deflection angle of stator；As illustrated, adjustable vane fills
Power is delivered to helical gear shaft 1004, helical gear shaft by the drive device 1001 put first by Poewr transmission mechanism 1003
1004 drive the direction pivots clockwise or counter-clockwise of driving gear 1005 to rotate, and driven gear 1007 drives stator by gear drive
1006 direction pivots clockwise or counter-clockwises rotate, and adjustment stator 1006 is to the angle position of optimization, and water pump operation is in efficiency optimization
Operating point, improve the hydraulic efficiency under water pump sub-load and excess load operating mode.
Fig. 3 is the schematic diagram of adjustable vane device feature of the present invention, and helical gear shaft 1004 is engaged by gear and driving tooth
Wheel 1005 transmits motion.
According to the requirement of pumped (conveying) medium, corresponding material, such as stainless steel can be selected in sectional multi-stage centrifugal pump of the invention,
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 yielding coupling 18 by being supported on electric machine support 19
Prime mover 20 directly drives.Pump shaft 7 drives first stage impeller 9, middle multiple secondary impellers 12, liquid pumping to the height specified
Degree.Adjustable vane device 10 is assemblied in stage casing 11.First stage impeller 9 and secondary impeller 12 are assemblied on pump shaft 7, and pump shaft 7 drives
Wheel rotation, so as to the liquid pressing that will be introduced from import.After liquid is pressurizeed by import by first stage impeller 9, led by adjustable
Leaf device 10 is collected and reduces flow velocity to be continued to pressurize into secondary impeller 12, and the liquid of pressurization is collected by adjustable vane device 10
And reduce flow velocity and pressurizeed into afterbody impeller, the liquid after pressurization is discharged from outlet by scroll casing shape water exit end 13 and is sent into pipe
Road system.The cross-sectional area of scroll casing shape water exit end 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
Footpath it is square directly proportional（Specific accurate corresponding relation is typically determined by experiment）.
The adjustable vane device and sectional multi-stage centrifugal pump of the present invention is because adjustable vane device is according to exit of pump
Pressure adjusts the angle of stator, thus improves the hydraulic efficiency under water pump sub-load and excess load operating mode, improves water pump
System, particularly frequency conversion or the operational efficiency of flow-changing water pumping system, save water pump system energy consumption.
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)
- A kind of 1. sectional multi-stage centrifugal pump, it is characterised in that including：Base, inlet segment, stage casing, water exit end, 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 inlet segment, stage casing and water exit end, 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 inlet segment is assemblied on the base, and the circulation passage of liquid is runner in the inlet segment, the mouth of the runner Portion is suction inlet；The stage casing, which is assemblied among inlet segment and water exit end, to be used to assemble adjustable vane device；The water exit end is assemblied between the stage casing and prime mover support and is connected with prime mover support, and the water outlet Mechanical seal is provided between section and pump shaft；Liquid communication part is runner in the water exit end, 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 inlet segment and be delivered to the adjustable vane device；The secondary impeller and impeller are assemblied on the pump shaft by wheel space ring axially position；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 adjustable vane device 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 secondary impeller and impeller, it is used for according to exit of pump pressure Force signal adjusts guide vane angle, thus improves operational efficiency of the water pump under sub-load and overload conditions, and it includes：Driving Device, feedback signal processor, Poewr transmission mechanism, helical gear shaft, driving gear, stator and driven gear, the feedback letter Number processor receives the pressure signal that water pump discharge pressure sensor transmits and by processing, so that it is determined that the stator is inclined Gyration；Wherein, the drive device is connected by the Poewr transmission mechanism and drives the helical gear shaft, the helical tooth Axle engages connection with the driving gear by gear, and the driven gear engages connection, the stator with the driving gear It is connected with the driven gear；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 mechanical seal is set on the pump shaft and between the water exit end and pump shaft, and the mechanical seal is local Stretch out the water exit end and directly dismantled with facilitating from the water exit end, thus without described in the maintenance of dismounting pump housing can or replacing Mechanical seal, it is easy to safeguard；The inlet segment circumferentially rotates installation with equal 360 degree of water exit end, and fluid intake and outlet direction are adjustable, are adapted to The pipe-line system of different directions installation；The water exit end uses scroll casing shape structure.
- 2. sectional multi-stage centrifugal pump according to claim 1, 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.
- 3. sectional multi-stage centrifugal pump according to claim 2, it is characterised in that the impeller passes through the wheel space Ring separates and carries out axially position, and the wheel space ring is positioned on the pump shaft by back-up ring.
- 4. sectional multi-stage centrifugal pump according to claim 2, it is characterised in that described prime mover is motor or internal combustion Machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610041787.5A CN105526194B (en) | 2016-01-21 | 2016-01-21 | Adjustable vane device and sectional multi-stage centrifugal pump |
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| CN201610041787.5A CN105526194B (en) | 2016-01-21 | 2016-01-21 | Adjustable vane device and sectional multi-stage centrifugal pump |
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| CN105526194B true CN105526194B (en) | 2018-01-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107975498B (en) | 2016-10-24 | 2021-08-31 | 开利公司 | Diffuser for centrifugal compressor and centrifugal compressor with diffuser |
| CN109826576B (en) * | 2019-03-15 | 2024-05-10 | 中国石油天然气集团有限公司 | Self-cleaning magnetic transmission depressurization rock-carrying short pipe |
| IT201900005266A1 (en) * | 2019-04-05 | 2020-10-05 | Nuovo Pignone Tecnologie Srl | Steam turbine with rotating stator blades |
| CN114483642B (en) * | 2022-02-15 | 2023-06-16 | 上海工业泵制造有限公司 | Centrifugal pump with adjustable guide vane |
| CN114837954B (en) * | 2022-05-13 | 2024-06-11 | 扬州大学 | Bidirectional submersible through-flow pump |
| CN115773089B (en) * | 2022-11-24 | 2024-06-11 | 新疆敦华绿碳技术股份有限公司 | Injection-production well shaft anti-corrosion instillation system |
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| JPS6191093U (en) * | 1984-11-20 | 1986-06-13 | ||
| JPH08226397A (en) * | 1995-02-20 | 1996-09-03 | Mitsubishi Heavy Ind Ltd | Device for reducing shaft power of mixed flow pump or axial flow pump |
| CN2371372Y (en) * | 1999-05-18 | 2000-03-29 | 曹伟祥 | Handy detachable vertical multi-stage centrifugal pump |
| JP2006063895A (en) * | 2004-08-27 | 2006-03-09 | Mitsubishi Heavy Ind Ltd | Centrifugal compressor |
| JP4900261B2 (en) * | 2008-01-25 | 2012-03-21 | 株式会社日立プラントテクノロジー | Centrifugal compressor |
| 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 |
| CN205371092U (en) * | 2016-01-21 | 2016-07-06 | 池泉 | Adjustable vane device and festival segmentation multistage centrifugal pump |
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