WO2023151223A1 - Multi-stage semi-open centrifugal pump capable of reducing wear - Google Patents

Multi-stage semi-open centrifugal pump capable of reducing wear Download PDF

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Publication number
WO2023151223A1
WO2023151223A1 PCT/CN2022/102573 CN2022102573W WO2023151223A1 WO 2023151223 A1 WO2023151223 A1 WO 2023151223A1 CN 2022102573 W CN2022102573 W CN 2022102573W WO 2023151223 A1 WO2023151223 A1 WO 2023151223A1
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semi
impeller
open
wear
blade
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PCT/CN2022/102573
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French (fr)
Chinese (zh)
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周岭
蒋磊
陆伟刚
李辉
韩勇
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江苏大学
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Publication of WO2023151223A1 publication Critical patent/WO2023151223A1/en

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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

Definitions

  • the inlet portion of the blade is rounded to a streamlined structure.
  • impeller inlet diameter D j 40mm
  • blade inlet diameter D 1 26mm
  • impeller hub diameter d h 18mm
  • blade inlet width b 1 20mm
  • blade inlet placement angle ⁇ 1 41.2985°
  • impeller outer diameter (outlet The impeller with diameter) D 2 78mm
  • blade outlet width b 2 11mm
  • blade outlet placement angle ⁇ 2 23°
  • blade number Z 6.

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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

A multi-stage semi-open centrifugal pump capable of reducing wear, comprising a semi-open impeller (1), a guide vane (2), and a pump body (3). The semi-open impeller (1) comprises a plurality of cylindrical blades (4); each blade (4) comprises a blade suction surface and a blade pressure surface; a blade inlet part is shaped into a streamline shape and is thinned as much as possible. According to the semi-open impeller, by removing a front cover plate of the impeller (1), a clearance between the pump body (3) and an impeller rear cover plate (5) is increased, a collision frequency between particles on side surfaces of the front cover plate and a front pump cavity and a wall surface is reduced, and the wear at the impeller and the wear at the front pump cavity are further reduced. A streamline outlet at the tail end of the rear cover plate reduces a hydraulic loss of outflow and wear, and a hydraulic loss of the semi-open impeller can be reduced by means of a blade tip clearance controlled by the shape of the pump body. According to the semi-open impeller structure, the wear of the impeller and the front pump cavity can be improved, the operation stability of the multi-stage centrifugal pump is improved, a failure rate is reduced, and the service life is prolonged.

Description

一种减少磨损的多级半开式离心泵A Multistage Semi-Open Centrifugal Pump with Reduced Wear 技术领域technical field
本发明属于离心泵技术领域，尤其涉及一种减少磨损的多级半开式离心泵。The invention belongs to the technical field of centrifugal pumps, in particular to a wear-reducing multistage semi-open centrifugal pump.
背景技术Background technique
在工业领域，30％以上的能源因为磨损和摩擦而被消耗，而因磨损而导致的设备耗损占总耗损量的60％以上。离心泵作为重要的流体输送设备，广泛应用于采矿、冶金、水利等领域。同样多级离心泵是抽取地下水的主要设备，我国北方地区地下水含沙量较大，由含沙水引起的泵磨损问题十分突出。多级离心泵在排水作业中表现不俗，作为可移动排水设备，常用于抢险救灾中。其输送介质不可避免的含有泥沙、煤泥、煤渣等不溶固体颗粒，由于泵输送的介质中通常含有固体颗粒，多级离心泵极易受到颗粒影响下的冲蚀磨损而发生扬程下降、停机、可靠性差等问题。In the industrial field, more than 30% of energy is consumed due to wear and friction, and equipment loss due to wear accounts for more than 60% of the total loss. As an important fluid conveying equipment, centrifugal pumps are widely used in mining, metallurgy, water conservancy and other fields. Similarly, multistage centrifugal pumps are the main equipment for extracting groundwater. The groundwater in northern my country has a relatively high sand content, and the pump wear problem caused by sandy water is very prominent. Multistage centrifugal pumps perform well in drainage operations. As movable drainage equipment, they are often used in emergency rescue and disaster relief. The conveying medium inevitably contains insoluble solid particles such as sediment, coal slime, and cinder. Since the medium conveyed by the pump usually contains solid particles, the multistage centrifugal pump is easily affected by the erosion and wear of the particles, resulting in head drop and shutdown. , Poor reliability and other issues.
当前，磨损相关的预测以及防护措施一直是泵行业相关的专家学者研究的热点。并且，离心泵应对磨损的措施常为减少叶片数以增大间隙以及加大叶片厚度，并未涉及过半开式叶轮。At present, wear-related predictions and protective measures have always been a hot research topic for experts and scholars in the pump industry. Moreover, the measures for centrifugal pumps to deal with wear are often to reduce the number of blades to increase the gap and increase the thickness of the blades, and have not involved semi-open impellers.
发明内容Contents of the invention
本发明的目的是克服现有技术中存在的不足，提供了一种减少磨损的新思路，提供了一种减少磨损的多级半开式离心泵。本发明中多级半开式离心泵中的半开式叶轮通过去除叶轮的前盖板，加大泵体与叶轮后盖板间隙，避免前盖板以及前泵腔侧面的颗粒与壁面的碰撞，进而减少叶轮处与前泵腔处的磨损。叶片进口部位流线型结构以及后盖板尾端流线型的出口减少了出流的水力损失以及磨损，并且通过泵体形状进行控制的叶顶间隙能减少半开式叶轮水力损失。The purpose of the present invention is to overcome the deficiencies in the prior art, provide a new idea of reducing wear, and provide a multi-stage semi-open centrifugal pump with reduced wear. The semi-open impeller in the multi-stage semi-open centrifugal pump in the present invention removes the front cover of the impeller, increases the gap between the pump body and the back cover of the impeller, and avoids collisions between the front cover and the particles on the side of the front pump chamber and the wall , thereby reducing wear at the impeller and at the front pump chamber. The streamlined structure of the blade inlet and the streamlined outlet at the rear end of the rear cover reduce the hydraulic loss and wear of the outflow, and the tip clearance controlled by the shape of the pump body can reduce the hydraulic loss of the semi-open impeller.
为实现上述目的，本发明采用的技术方案如下：To achieve the above object, the technical scheme adopted in the present invention is as follows:
一种减少磨损的多级半开式离心泵，包括半开式叶轮、导叶和泵体，半开式叶轮位于多级泵的导叶以及泵体之间，其中，半开式叶轮包括叶片、后盖板、叶片进口流线型结构以及后盖板尾端出口流线型结构，多个叶片沿周向均匀分布于后盖板上，从进口看半开式叶轮为顺时针方向旋转，后盖板呈圆盘状，叶片为圆柱形叶片。A multi-stage semi-open centrifugal pump for reducing wear, comprising a semi-open impeller, guide vanes and a pump body, the semi-open impeller is located between the guide vanes and the pump body of the multi-stage pump, wherein the semi-open impeller includes blades , the back cover, the streamlined structure of the inlet of the blade and the streamlined structure of the outlet at the tail end of the back cover. Multiple blades are evenly distributed on the back cover along the circumferential direction. Seen from the inlet, the semi-open impeller rotates in a clockwise direction, and the back cover is in the shape of Disc-shaped, with cylindrical blades.
优选的，所述半开式叶轮的参数为：叶轮进口直径D j＝40mm、叶片进口直径D 1＝26mm、叶轮轮毂直径d h＝18mm、叶片进口宽度b 1＝20mm、叶片进口安放角β 1＝41.2985°、叶轮外径(出口直径)D 2＝78mm、叶片出口宽度b 2＝11mm、叶片出口安放角β 2＝23°、叶片数Z＝6。 Preferably, the parameters of the semi-open impeller are: impeller inlet diameter D j = 40 mm, blade inlet diameter D 1 = 26 mm, impeller hub diameter d h = 18 mm, blade inlet width b 1 = 20 mm, blade inlet placement angle β 1 =41.2985°, impeller outer diameter (outlet diameter) D 2 =78mm, blade outlet width b 2 =11mm, blade outlet placement angle β 2 =23°, blade number Z=6.
优选的，所述叶片进口部位通过圆角修整为流线型结构。Preferably, the inlet portion of the blade is rounded to a streamlined structure.
优选的，所述后盖板尾端出口通过圆角修整为流线型结构。Preferably, the outlet at the rear end of the rear cover is rounded to a streamlined structure.
优选的，半开式叶轮叶片的叶顶与泵体之间的叶顶间隙通过泵体形状进行控制，所述叶顶间隙h＝0.5mm～2mm。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=0.5mm˜2mm.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明中多级半开式离心泵中的半开式叶轮通过去除叶轮的前盖板，加大泵体与叶轮后盖板间隙，避免前盖板以及前泵腔侧面的颗粒与壁面的碰撞，进而减少叶轮处与前泵腔处的磨损。叶片进口部位流线型结构以及后盖板尾端流线型的出口减少了出流的水力损失以及磨损，并且通过泵体形状进行控制的叶顶间隙能减少半开式叶轮水力损失。半开式叶轮针对磨损的破坏规律及发生位置提出有效防护措施，对降低生产成本以及设备失效停机带来的损失、提高设备运行效率具有重大意义。半开式叶轮对提高多级离心泵运行稳定性，降低故障率，提高使用寿命具有重大意义。The semi-open impeller in the multi-stage semi-open centrifugal pump in the present invention removes the front cover of the impeller, increases the gap between the pump body and the back cover of the impeller, and avoids collisions between the front cover and the particles on the side of the front pump cavity and the wall , thereby reducing wear at the impeller and at the front pump chamber. The streamlined structure of the blade inlet and the streamlined outlet at the rear end of the rear cover reduce the hydraulic loss and wear of the outflow, and the tip clearance controlled by the shape of the pump body can reduce the hydraulic loss of the semi-open impeller. The semi-open impeller puts forward effective protective measures for the damage law and occurrence location of wear, which is of great significance to reduce production costs and losses caused by equipment failure and downtime, and improve equipment operation efficiency. The semi-open impeller is of great significance to improve the operation stability of the multi-stage centrifugal pump, reduce the failure rate and increase the service life.
附图说明Description of drawings
图1为本发明所述多级离心泵第一级剖面结构示意图Fig. 1 is the schematic diagram of the cross-sectional structure of the first stage of the multistage centrifugal pump of the present invention
图2为多级离心泵半开式叶轮轴面剖面结构示意图Figure 2 is a schematic diagram of the cross-sectional structure of the semi-open impeller shaft of a multistage centrifugal pump
图3为多级离心泵半开式叶轮俯视图Figure 3 is a top view of the semi-open impeller of a multistage centrifugal pump
图中：1-半开式叶轮，2-导叶，3-泵体，4-叶片，5-后盖板，6-叶片进口流线型结构，7-叶轮出口流线型结构，8-叶顶间隙。In the figure: 1-semi-open impeller, 2-guide vane, 3-pump body, 4-blade, 5-rear cover, 6-blade inlet streamlined structure, 7-impeller outlet streamlined structure, 8-blade tip clearance.
具体实施方式Detailed ways
以下结合说明书附图以及实施例对本发明进行进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
实施例1：Example 1:
所述多级半开式离心泵包括半开式叶轮1、导叶2和泵体3，半开式叶轮1位于多级泵的导叶2以及泵体3之间；其中，半开式叶轮1包括叶片4、后盖板5、叶片进口流线型结构6以及后盖板尾端出口流线型结构7，后盖板呈圆盘状，多个叶片沿周向均匀分布于后盖板上，从进口看叶轮为顺时针方向旋转且叶片为圆柱形叶片。The multistage semi-open centrifugal pump includes a semi-open impeller 1, guide vanes 2 and pump body 3, and the semi-open impeller 1 is positioned between the guide vanes 2 and the pump body 3 of the multistage pump; wherein the semi-open impeller 1 includes the blade 4, the rear cover 5, the blade inlet streamlined structure 6 and the rear end outlet streamlined structure 7 of the rear cover, the rear cover is disc-shaped, and multiple blades are evenly distributed on the rear cover along the circumference, See that the impeller rotates clockwise and the blades are cylindrical blades.
选择参数为叶轮进口直径D j＝40mm、叶片进口直径D 1＝26mm、叶轮轮毂直径d h＝18mm、叶片进口宽度b 1＝20mm、叶片进口安放角β 1＝41.2985°、叶轮外径(出口直径)D 2＝78mm、叶片出口宽度b 2＝11mm、叶片出口安放角β 2＝23°、叶片数Z＝6的叶轮。去除叶轮前盖板，叶片进口处修整为1mm的圆角，后盖板尾端出口处修整为半径为1.5mm的圆角。 The selected parameters are impeller inlet diameter D j = 40mm, blade inlet diameter D 1 = 26mm, impeller hub diameter d h = 18mm, blade inlet width b 1 = 20mm, blade inlet placement angle β 1 = 41.2985°, impeller outer diameter (outlet The impeller with diameter) D 2 =78mm, blade outlet width b 2 =11mm, blade outlet placement angle β 2 =23°, blade number Z=6. Remove the front cover of the impeller, round the inlet of the blade to a rounded corner of 1mm, and trim the exit of the tail end of the rear cover to a rounded corner with a radius of 1.5mm.
本发明的工作原理：Working principle of the present invention:
本发明中多级半开式离心泵中的半开式叶轮通过去除叶轮的前盖板，加大泵体与叶轮后盖板间隙，避免前盖板以及前泵腔侧面的颗粒与壁面的碰撞，进而减少叶轮处与前泵腔处的磨损。叶片进口部位流线型结构以及后盖板尾端出口流线型结构减少了出流的水力损失以及磨损，并且通过泵体形状进行控制的叶顶间隙能减少半开式叶轮水力损失。通过CFX 2019 R1中欧拉-拉格朗日双向耦合数值计算得出相同参数下闭式叶轮与半开式叶轮相同边界条件下磨损情况。三级离心泵中半开式叶轮相较于闭式叶轮磨损量减少78.44％。由此印证半开式叶轮能极大的减少叶轮以及前泵腔磨损，半开式叶轮能提高多级离心泵运行稳定性，降低故障率，提高使用寿命。The semi-open impeller in the multi-stage semi-open centrifugal pump in the present invention removes the front cover of the impeller, increases the gap between the pump body and the back cover of the impeller, and avoids collisions between the front cover and the particles on the side of the front pump cavity and the wall , thereby reducing wear at the impeller and at the front pump chamber. The streamlined structure of the blade inlet and the streamlined structure of the outlet at the rear end of the rear cover reduce the hydraulic loss and wear of the outflow, and the tip clearance controlled by the shape of the pump body can reduce the hydraulic loss of the semi-open impeller. Through the numerical calculation of the Euler-Lagrangian two-way coupling in CFX 2019 R1, the wear conditions of the closed impeller and the semi-open impeller under the same boundary conditions are obtained under the same parameters. In the three-stage centrifugal pump, the wear of the semi-open impeller is reduced by 78.44% compared with that of the closed impeller. This proves that the semi-open impeller can greatly reduce the wear of the impeller and the front pump chamber, and the semi-open impeller can improve the operation stability of the multi-stage centrifugal pump, reduce the failure rate and increase the service life.

Claims (7)

  1. 一种减少磨损的多级半开式离心泵，其特征在于，所述多级半开式离心泵包括半开式叶轮(1)、导叶(2)和泵体(3)，半开式叶轮(1)位于多级泵的导叶(2)以及泵体(3)之间；半开式叶轮(1)包括叶片(4)、后盖板(5)、叶片进口流线型结构(6)以及后盖板尾端出口流线型结构(7)，多个叶片(4)沿周向均匀分布于后盖板(5)上，从进口看半开式叶轮(1)为顺时针方向旋转。A kind of wear-reducing multistage semi-open centrifugal pump, it is characterized in that, described multistage semi-open centrifugal pump comprises semi-open impeller (1), guide vane (2) and pump body (3), semi-open The impeller (1) is located between the guide vane (2) and the pump body (3) of the multistage pump; the semi-open impeller (1) includes the blade (4), the rear cover plate (5), and the streamlined structure of the blade inlet (6) As well as the streamlined structure (7) at the outlet of the tail end of the back cover, a plurality of blades (4) are evenly distributed on the back cover (5) along the circumference, and the semi-open impeller (1) rotates clockwise when viewed from the inlet.
  2. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，所述叶片(4)为圆柱形叶片。A wear-reducing multi-stage semi-open centrifugal pump according to claim 1, characterized in that the blades (4) are cylindrical blades.
  3. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，所述后盖板(5)呈圆盘状。A wear-reducing multistage semi-open centrifugal pump according to claim 1, characterized in that the rear cover plate (5) is disc-shaped.
  4. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，所述半开式叶轮(1)的参数为：叶轮进口直径D j＝40mm、叶片进口直径D 1＝26mm、叶轮轮毂直径d h＝18mm、叶片进口宽度b 1＝20mm、叶片进口安放角β 1＝41.2985°、叶轮外径即出口直径D 2＝78mm、叶片出口宽度b 2＝11mm、叶片出口安放角β 2＝23°、叶片数Z＝6。 A wear-reducing multi-stage semi-open centrifugal pump according to claim 1, characterized in that the parameters of the semi-open impeller (1) are: impeller inlet diameter D j =40mm, blade inlet diameter D 1 =26mm, impeller hub diameter d h =18mm, blade inlet width b 1 =20mm, blade inlet placement angle β 1 =41.2985°, impeller outer diameter or outlet diameter D 2 =78mm, blade outlet width b 2 =11mm, blade outlet The placement angle β 2 =23°, the number of blades Z=6.
  5. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，所述叶片进口部位通过圆角修整为流线型结构。A wear-reducing multi-stage semi-open centrifugal pump according to claim 1, characterized in that the inlet part of the blade is rounded to a streamlined structure.
  6. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，所述后盖板尾端出口通过圆角修整为流线型结构。A wear-reducing multi-stage semi-open centrifugal pump according to claim 1, characterized in that the outlet at the rear end of the rear cover is rounded to a streamlined structure.
  7. 根据权利要求1所述的一种减少磨损的多级半开式离心泵，其特征在于，半开式叶轮叶片的叶顶与泵体之间的叶顶间隙为h＝0.5mm～2mm。A wear-reducing multi-stage semi-open centrifugal pump according to claim 1, characterized in that the tip clearance between the tip of the semi-open impeller blade and the pump body is h=0.5mm-2mm.
PCT/CN2022/102573 2022-02-11 2022-06-30 Multi-stage semi-open centrifugal pump capable of reducing wear WO2023151223A1 (en)

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

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