CN114607613A - Multistage semi-open type centrifugal pump capable of reducing abrasion - Google Patents

Multistage semi-open type centrifugal pump capable of reducing abrasion Download PDF

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Publication number
CN114607613A
CN114607613A CN202210129974.4A CN202210129974A CN114607613A CN 114607613 A CN114607613 A CN 114607613A CN 202210129974 A CN202210129974 A CN 202210129974A CN 114607613 A CN114607613 A CN 114607613A
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CN
China
Prior art keywords
semi
impeller
blade
open
multistage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202210129974.4A
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Chinese (zh)
Inventor
周岭
蒋磊
陆伟刚
李辉
韩勇
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Jiangsu University
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Jiangsu University
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Publication date
Application filed by Jiangsu University filed Critical Jiangsu University
Priority to CN202210129974.4A priority Critical patent/CN114607613A/en
Publication of CN114607613A publication Critical patent/CN114607613A/en
Priority to PCT/CN2022/102573 priority patent/WO2023151223A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • 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

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

Abstract

The invention belongs to the technical field of centrifugal pumps, and discloses a multistage semi-open type centrifugal pump capable of reducing abrasion, which comprises a semi-open type impeller, a guide vane and a pump body, wherein the semi-open type impeller comprises a plurality of cylindrical blades, each blade comprises a blade suction surface and a blade pressure surface, and the inlet part of each blade is trimmed to be streamline and thinned as much as possible. According to the semi-open type impeller, the front cover plate of the impeller is removed, the gap between the pump body and the rear cover plate of the impeller is enlarged, the collision frequency of particles on the side surfaces of the front cover plate and the front pump cavity and the wall surface is avoided, and the abrasion of the impeller and the front pump cavity is further reduced. And the streamline outlet at the tail end of the rear cover plate reduces the hydraulic loss and abrasion of outflow, and the hydraulic loss of the semi-open impeller can be reduced by controlling the blade top gap through the shape of the pump body. The semi-open type impeller structure obtained through a numerical simulation result has the characteristic of greatly improving the abrasion between the impeller and the front pump cavity, and has great significance for improving the operation stability of the multistage centrifugal pump, reducing the failure rate and prolonging the service life.

Description

Multistage semi-open type centrifugal pump capable of reducing abrasion
Technical Field
The invention belongs to the technical field of centrifugal pumps, and particularly relates to a multistage semi-open type centrifugal pump capable of reducing abrasion.
Background
In the industrial field, more than 30% of energy is consumed due to wear and friction, and equipment wear due to wear accounts for more than 60% of the total wear. The centrifugal pump is used as important fluid conveying equipment and is widely applied to the fields of mining, metallurgy, water conservancy and the like. The multistage centrifugal pump is a main device for pumping underground water, the underground water in northern areas of China has large sand content, and the problem of pump abrasion caused by sand-containing water is very prominent. The multi-stage centrifugal pump is unusual in drainage operation, and is used as movable drainage equipment and is commonly used for emergency rescue and disaster relief. The conveying medium of the multistage centrifugal pump inevitably contains insoluble solid particles such as silt, coal slime, coal slag and the like, and the medium conveyed by the pump usually contains the solid particles, so that the multistage centrifugal pump is easy to suffer from erosion and abrasion under the influence of the particles to cause the problems of head reduction, machine halt, poor reliability and the like.
Wear related predictions and safeguards are currently a focus of research by expert scholars associated with the pump industry. Furthermore, the measures for the centrifugal pump to cope with the wear are to reduce the number of blades to increase the clearance and increase the thickness of the blades, and the semi-open impeller is not involved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a new idea for reducing abrasion and provides a multistage semi-open type centrifugal pump for reducing abrasion. According to the semi-open type impeller in the multistage semi-open type centrifugal pump, the front cover plate of the impeller is removed, the gap between the pump body and the rear cover plate of the impeller is enlarged, the collision between particles on the side surfaces of the front cover plate and the front pump cavity and the wall surface is avoided, and the abrasion between the impeller and the front pump cavity is further reduced. The streamline structure of the inlet part of the blade and the streamline outlet of the tail end of the rear cover plate reduce the hydraulic loss and abrasion of outflow, and the hydraulic loss of the semi-open impeller can be reduced by controlling the blade top gap through the shape of the pump body.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a multistage semi-open centrifugal pump of reducing wear, includes the semi-open impeller, the stator and the pump body, and the semi-open impeller is located between the stator and the pump body of multistage pump, and wherein, the semi-open impeller includes blade, back shroud, the streamlined structure of blade import and the streamlined structure of back shroud tail end export, and a plurality of blades are along circumference evenly distributed on the back shroud, and the semi-open impeller is rotatory for the clockwise direction from the import, and the back shroud is discoid, and the blade is cylindrical blade.
Preferably, the parameters of the semi-open impeller are as follows: impeller inlet diameter Dj40mm blade inlet diameter D126mm, impeller hub diameter dh18mm, blade inlet width b120mm blade inlet setting angle beta141.2985 ° impeller outer diameter (outlet diameter) D278mm, blade exit width b211mm blade outlet setting angle beta223 DEG, and the number of the blades Z is 6.
Preferably, the inlet part of the blade is trimmed into a streamline structure through a fillet.
Preferably, the outlet at the tail end of the rear cover plate is trimmed into a streamline structure through a fillet.
Preferably, the tip clearance between the tip of the semi-open impeller blade and the pump body is controlled by the shape of the pump body, and the tip clearance h is 0.5 mm-2 mm.
The invention has the beneficial effects that:
according to the semi-open type impeller in the multistage semi-open type centrifugal pump, the front cover plate of the impeller is removed, the gap between the pump body and the rear cover plate of the impeller is enlarged, the collision between particles on the side surfaces of the front cover plate and the front pump cavity and the wall surface is avoided, and the abrasion between the impeller and the front pump cavity is further reduced. The streamline structure of the inlet part of the blade and the streamline outlet of the tail end of the rear cover plate reduce the hydraulic loss and abrasion of outflow, and the hydraulic loss of the semi-open impeller can be reduced by controlling the blade top gap through the shape of the pump body. The semi-open impeller provides effective protective measures aiming at the damage rule and the occurrence position of abrasion, and has great significance for reducing the production cost, reducing the loss caused by equipment failure and shutdown and improving the operation efficiency of the equipment. The semi-open impeller has great significance for improving the operation stability of the multistage centrifugal pump, reducing the failure rate and prolonging the service life.
Drawings
FIG. 1 is a schematic sectional view of the first stage of the multistage centrifugal pump according to the present invention
FIG. 2 is a schematic axial section of a semi-open impeller of a multistage centrifugal pump
FIG. 3 is a top view of a semi-open impeller of the multistage centrifugal pump
In the figure: 1-semi-open type impeller, 2-guide vane, 3-pump body, 4-blade, 5-rear cover plate, 6-blade inlet streamline structure, 7-impeller outlet streamline structure and 8-blade top gap.
Detailed Description
The invention is further described with reference to the drawings and examples.
Example 1:
the multistage semi-open centrifugal pump comprises a semi-open impeller 1, a guide vane 2 and a pump body 3, wherein the semi-open impeller 1 is positioned between the guide vane 2 and the pump body 3 of the multistage pump; wherein, semi-open impeller 1 includes blade 4, back shroud 5, blade import streamlined structure 6 and back shroud tail end export streamlined structure 7, and the back shroud is discoid, and a plurality of blades are along circumference evenly distributed on the back shroud, and it is rotatory and the blade is cylindrical blade for clockwise to see the impeller from the import.
The parameter is selected as the diameter D of the inlet of the impellerj40mm, blade inlet diameter D126mm, impeller hub diameter dh18mm, blade inlet width b120mm blade inlet setting angle beta141.2985 ° impeller outer diameter (outlet diameter) D278mm, blade exit width b211mm blade outlet setting angle beta223 DEG and 6. And removing a front cover plate of the impeller, finishing a blade inlet into a fillet of 1mm, and finishing a tail end outlet of a rear cover plate into a fillet with the radius of 1.5 mm.
The working principle of the invention is as follows:
according to the semi-open type impeller in the multistage semi-open type centrifugal pump, the front cover plate of the impeller is removed, the gap between the pump body and the rear cover plate of the impeller is enlarged, the collision between particles on the side surfaces of the front cover plate and the front pump cavity and the wall surface is avoided, and the abrasion between the impeller and the front pump cavity is further reduced. The streamline structure at the inlet part of the blade and the streamline structure at the tail end outlet of the rear cover plate reduce the hydraulic loss and abrasion of outflow, and the hydraulic loss of the semi-open impeller can be reduced by controlling the blade top gap through the shape of the pump body. And (3) calculating the abrasion condition of the closed impeller and the semi-open impeller under the same boundary condition under the same parameters through Euler-Lagrange bidirectional coupling numerical values in CFX 2019R 1. Compared with a closed impeller, the semi-open impeller in the three-stage centrifugal pump has the advantage that the abrasion loss is reduced by 78.44%. From this seal half open impeller can the very big reduction impeller of ability and preceding pump chamber wearing and tearing, and half open impeller can improve multistage centrifugal pump operating stability, reduces the fault rate, improves life.

Claims (7)

1. The multistage semi-open centrifugal pump capable of reducing wear is characterized by comprising a semi-open impeller (1), a guide vane (2) and a pump body (3), wherein the semi-open impeller (1) is positioned between the guide vane (2) and the pump body (3) of the multistage pump; semi-open impeller (1) includes blade (4), back shroud (5), blade import streamlined structure (6) and back shroud tail end export streamlined structure (7), and a plurality of blades (4) are along circumference evenly distributed on back shroud (5), and it is clockwise rotation to see semi-open impeller (1) from the import.
2. A multistage semi-open centrifugal pump with reduced wear according to claim 1, characterized in that the vanes (4) are cylindrical vanes.
3. A multistage semi-open centrifugal pump with reduced wear according to claim 1, characterized in that the back cover plate (5) is disc-shaped.
4. A multistage semi-open centrifugal pump with reduced wear according to claim 1, characterized in that the parameters of the semi-open impeller (1) are: impeller inlet diameter Dj40mm blade inlet diameter D126mm, impeller hub diameter dh18mm, blade inlet width b120mm blade inlet setting angle beta141.2985 ° for the impeller outer diameter, i.e. the outlet diameter D278mm, blade exit width b211mm blade outlet setting angle beta223 DEG, and the number of the blades Z is 6.
5. The multistage semi-open centrifugal pump of claim 1, wherein said vane inlet region is rounded to streamline configuration.
6. The multistage semi-open centrifugal pump of claim 1, wherein the outlet at the aft end of the back cover plate is rounded off to a streamlined configuration.
7. The multistage semi-open centrifugal pump of claim 1, wherein the tip clearance between the tip of the semi-open impeller blade and the pump body is 0.5mm to 2 mm.
CN202210129974.4A 2022-02-11 2022-02-11 Multistage semi-open type centrifugal pump capable of reducing abrasion Withdrawn CN114607613A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210129974.4A CN114607613A (en) 2022-02-11 2022-02-11 Multistage semi-open type centrifugal pump capable of reducing abrasion
PCT/CN2022/102573 WO2023151223A1 (en) 2022-02-11 2022-06-30 Multi-stage semi-open centrifugal pump capable of reducing wear

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CN202210129974.4A CN114607613A (en) 2022-02-11 2022-02-11 Multistage semi-open type centrifugal pump capable of reducing abrasion

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112879307A (en) * 2020-03-31 2021-06-01 温岭市高深泵业科技有限公司 Single-stage external member of partial flow pump and multistage partial flow pump thereof
CN115030914A (en) * 2022-06-16 2022-09-09 江苏大学镇江流体工程装备技术研究院 Low-vibration impeller of vortex pump
WO2023151223A1 (en) * 2022-02-11 2023-08-17 江苏大学 Multi-stage semi-open centrifugal pump capable of reducing wear

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CN1784548A (en) * 2003-06-16 2006-06-07 威尔沃尔曼有限公司 Improved pump impeller
CN102003407A (en) * 2010-10-08 2011-04-06 江苏振华泵业制造有限公司 Design method for high-efficiency overload-free vortex pump impeller
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CN105003458A (en) * 2014-04-23 2015-10-28 苏尔寿管理有限公司 Impeller for a centrifugal pump, a centrifugal pump and a use thereof
CN104819167A (en) * 2015-04-24 2015-08-05 江苏大学 Impeller of stainless steel punching-welding centrifugal pump and designing method thereof
CN106989054A (en) * 2017-05-19 2017-07-28 南京腾图节能科技有限公司 A kind of absorption tower desulfurized pump impeller greatly distorted
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CN212376954U (en) * 2020-05-25 2021-01-19 浙江理工大学 Centrifugal pump semi-open impeller with gap channel arranged on blade top

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN112879307A (en) * 2020-03-31 2021-06-01 温岭市高深泵业科技有限公司 Single-stage external member of partial flow pump and multistage partial flow pump thereof
WO2023151223A1 (en) * 2022-02-11 2023-08-17 江苏大学 Multi-stage semi-open centrifugal pump capable of reducing wear
CN115030914A (en) * 2022-06-16 2022-09-09 江苏大学镇江流体工程装备技术研究院 Low-vibration impeller of vortex pump

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