WO2020238669A1 - 一种离心泵叶轮圆柱叶片进口边曲面工艺方法 - Google Patents

一种离心泵叶轮圆柱叶片进口边曲面工艺方法 Download PDF

Info

Publication number
WO2020238669A1
WO2020238669A1 PCT/CN2020/090769 CN2020090769W WO2020238669A1 WO 2020238669 A1 WO2020238669 A1 WO 2020238669A1 CN 2020090769 W CN2020090769 W CN 2020090769W WO 2020238669 A1 WO2020238669 A1 WO 2020238669A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
curve
arc
cylindrical blade
curved surface
Prior art date
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.)
Ceased
Application number
PCT/CN2020/090769
Other languages
English (en)
French (fr)
Inventor
张启华
康顺
张为栋
闫召旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu University
Original Assignee
Jiangsu University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangsu University filed Critical Jiangsu University
Priority to GB2019521.0A priority Critical patent/GB2588335B/en
Priority to US17/251,816 priority patent/US11333161B2/en
Priority to JP2020569908A priority patent/JP6963852B2/ja
Publication of WO2020238669A1 publication Critical patent/WO2020238669A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal 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
    • F04D29/2216—Shape, geometry
    • 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
    • F04D29/18—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
    • 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
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade

Definitions

  • the invention relates to the technical field of centrifugal pump impellers, in particular to a process method for the inlet side curved surface of a cylindrical blade of a centrifugal pump impeller.
  • the invention patent No. 2015105271786 Design Method for Controllable Inlet Angle Cylindrical Blade
  • this method uses a spirally designed cylindrical blade curve, which can set the inlet angle and draw a curve.
  • the present invention provides a centrifugal pump impeller cylindrical blade inlet edge curved surface process method, which extends tangentially to the top curve to reduce the blade angle.
  • the inlet edge curved surface formed between the top curve and the bottom curve after modification has a twisted shape, but still remains a cylindrical blade, which does not affect the mold and casting or injection molding production; and the inlet edge of the blade adopts this method is more in line with the incoming flow direction Angle, can improve the performance of the impeller.
  • the present invention provides the following solutions:
  • the invention provides a centrifugal pump impeller cylindrical blade inlet edge curved surface process method, including the following steps:
  • the first step is to draw circles with diameters D1 and D2 with the center of the existing cylindrical blade impeller as the center.
  • the circle with diameter D1 is the inlet position at the top of the improved blade, and the circle with diameter D2 is the inlet position at the bottom of the improved blade. ;
  • the second step is to determine a point P1 from the center of the circle S1 on the concave side of the existing cylindrical blade; to determine a point P2 from the center of the circle S2 on the concave side of the blade;
  • Step 3 Extend the concave side curve at the top of the existing cylindrical blade tangentially at point P1 to draw the arc R1 section; then draw the tangent arc R3 between the extension curve and the convex side curve;
  • Step 4 Extend the concave curve of the bottom of the existing cylindrical blade tangentially at point P2, draw the arc R2 segment, and then draw the arc R4 where the extension curve is tangent to the convex curve;
  • the fifth step is to start with R3 arc and end with R4 arc, and use the arc surface to smoothly transition from R3 to R4, making the radius of R4 section larger than the radius of R3 section, forming a draft angle from bottom to top .
  • the distance S1 (1.1-1.3) ⁇ (D1)/2.
  • the distance S2 (1.1-1.3) ⁇ (D2)/2.
  • the centrifugal pump impeller cylindrical blade inlet side curved surface process method makes the top inlet side angle of the blade more tangential, thereby reducing the inlet angle of the top blade.
  • a twisted surface is formed between the top R1 arc and the bottom R2 arc. This twisting feature helps to improve the adaptability of the convective flow at the inlet side of the blade.
  • the blades on the inlet side of the new structure are still cylindrical blades, and the drafting is convenient.
  • Figure 1 is a schematic view of the structure of an existing cylindrical blade impeller
  • Figure 2 is a schematic diagram of the three-dimensional structure of an existing cylindrical blade impeller
  • Figure 3 is a schematic structural view of the inlet edge curved surface process using the inlet edge curved surface process method of the centrifugal pump impeller cylindrical blade of the present invention
  • FIG. 4 is an enlarged schematic diagram of the inlet edge curved surface process using the inlet edge curved surface process method of the centrifugal pump impeller cylindrical blade of the present invention
  • Fig. 5 is a schematic structural diagram of the impeller of the centrifugal pump impeller cylindrical blade inlet edge curved surface process method of the present invention.
  • this embodiment provides a process method for the curved surface of the inlet edge of a cylindrical blade of a centrifugal pump impeller, which includes the following steps:
  • the first step is to draw circles with diameters D1 and D2 with the center of the existing cylindrical blade impeller as the center.
  • the circle with diameter D1 is the inlet position at the top of the improved blade, and the circle with diameter D2 is the inlet position at the bottom of the improved blade. ;
  • Step 3 Extend the concave side curve at the top of the existing cylindrical blade tangentially at point P1, and draw the arc R1 segment; then draw the tangent arc R3 between the extension curve and the convex side curve;
  • Step 4 Extend the concave side curve at the bottom of the existing cylindrical blade tangentially at point P2, draw the arc R2 segment, and then draw the arc R4 where the extension curve is tangent to the convex side curve;
  • Step 5 Start with R3 arc and end with R4 arc. Use the arc surface to smoothly transition from R3 to R4. Make the radius of R4 section larger than the radius of R3 section to form a draft angle from bottom to top. .

Landscapes

  • 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

一种离心泵叶轮圆柱叶片进口边（3）曲面工艺方法，通过改进叶轮中叶片的形状，使叶片顶部进口边角度更偏切向，从而降低顶部叶片的进口角度。在顶部R1段圆弧与底部R2段圆弧之间构成一个扭曲面（6）。

Description

一种离心泵叶轮圆柱叶片进口边曲面工艺方法 技术领域
本发明涉及离心泵叶轮技术领域，特别是涉及一种离心泵叶轮圆柱叶片进口边曲面工艺方法。
背景技术
过去，在圆柱叶片离心泵设计中很少关注叶片进口的设计工艺问题。在圆柱形叶片设计中，叶片的顶部曲线与底部曲线是重合的，在实际设计中，只要绘制一条凹侧曲线和一条凸侧曲线即可，例如，“现代泵技术手册”，第一版，1995，第229页；或者，也可只绘制一条中间曲线，并给定沿曲线的叶片厚度即可。
期刊论文“对几种圆柱形叶片的分析与研究”，《排灌机械》，2000；研究了阿基米德螺线、圆弧线、对数螺线等绘制法，并指出可以采用几种曲线进行拼接等。
期刊论文“低比转速泵圆柱形叶片型线的研究”，《长江大学学报(自然科学版)》，2009；介绍了三次多项式绘制叶片曲线方法。
专利号为2015105271786的发明专利“可控进口安放角圆柱形叶片的设计方法”，该方法采用螺旋线设计的圆柱叶片曲线，可以设置进口角度进而绘制出一条曲线。
显然，上述方法绘制的叶片顶部和底部都是同一条曲线。
然而，叶片顶部和叶片底部的来流条件并不一样，顶部来流角度要比底部来流角小很多。通常，顶部曲线和底部曲线并不重合。这也是大多数离心泵叶轮采用双曲率叶片的原因(双曲率指叶片顶部曲线和底部曲线采用不同的曲线，这也称为扭曲叶片)。但双曲率叶片是空间扭曲的，给实际制造带来了困难，也提高了开模、铸造的成本。这也是一部分比转速较小的泵以及一些成本低的小型泵选择采用圆柱叶片的原因。但采用圆柱叶片就难以避免导致叶片进口边对来流角度的不适应，通常相比扭曲叶片的叶轮效率低若干百分点。
发明内容
为解决以上技术问题，本发明提供一种离心泵叶轮圆柱叶片进口边曲面工艺方法，对顶部曲线沿切向延伸，使叶片角减小。通过改造后的顶部曲线和底部曲线之间构成的进口边曲面具有扭曲形状，但仍然保持为圆柱叶片，并不影响模具及铸造或注塑生产；且采用本方法的叶片进口边更符合来流方向角，能够改善叶轮性能。
为实现上述目的，本发明提供了如下方案：
本发明提供一种离心泵叶轮圆柱叶片进口边曲面工艺方法，包括以下步骤：
第一步、以现有圆柱叶片叶轮的圆心为圆心绘制直径为D1和D2的圆，直径为D1的圆为改进后的叶片顶部进口位置，直径为D2的圆是改进后的叶片底部进口位置；
第二步、在现有圆柱叶片顶部凹侧曲线上确定一个距离圆心S1的点P1；在叶片底部凹侧曲线上确定一个距离圆心S2的点P2；
第三步、将现有圆柱叶片顶部凹侧曲线在P1点处沿切向延伸，绘制圆弧R1段；再绘制延伸曲线与凸侧曲线的相切圆弧R3；
第四步、将现有圆柱叶片底部凹侧曲线在P2点处沿切向延伸，绘制圆弧R2段，再绘制延伸曲线与凸侧曲线相切的圆弧R4；
第五步、以R3圆弧为起始，以R4圆弧为终止，用圆弧面光滑的从R3过渡到R4，使R4段半径大于R3段半径，形成由底部到顶部的拔模斜度。
可选的，距离S1＝(1.1-1.3)×(D1)/2。
可选的，距离S2＝(1.1-1.3)×(D2)/2。
本发明相对于现有技术取得了以下技术效果：
本发明中的离心泵叶轮圆柱叶片进口边曲面工艺方法，使叶片顶部进口边角度更偏切向，从而降低顶部叶片的进口角度。由顶部R1段圆弧与底部R2段圆弧之间构成一个扭曲面。该扭曲特征有利于改善叶片进口边对来流流动的适应性。同时，采用新构造进口边的叶片仍然是圆柱叶片，且拔模方便。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为现有圆柱叶片叶轮的结构示意图；
图2为现有圆柱叶片叶轮的三维结构示意图；
图3为采用本发明中离心泵叶轮圆柱叶片进口边曲面工艺方法的进口边曲面工艺的结构示意图；
图4为采用本发明中离心泵叶轮圆柱叶片进口边曲面工艺方法的进口边曲面工艺的结构放大示意图；
图5为本发明离心泵叶轮圆柱叶片进口边曲面工艺方法叶轮的结构示意图。
附图标记说明：1、叶片顶部凸侧和凹侧曲线；2、叶片底部凸侧和凹侧曲线；3、叶片进口边；4、叶片顶部凸侧曲线；5、叶片顶部凹侧曲线；6、扭曲面；7、叶片底部凹侧曲线；8、叶片底部凸侧曲线。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一：
如图1所示，本实施例提供一种离心泵叶轮圆柱叶片进口边曲面工艺方法，包括以下步骤：
第一步、以现有圆柱叶片叶轮的圆心为圆心绘制直径为D1和D2的圆，直径为D1的圆为改进后的叶片顶部进口位置，直径为D2的圆是改进后的叶片底部进口位置；
第二步、在现有圆柱叶片顶部凹侧曲线上确定一个距离圆心S1的点 P1，距离S1＝(1.1-1.3)×(D1)/2；在叶片底部凹侧曲线上确定一个距离圆心S2的点P2，距离S2＝(1.1-1.3)×(D2)/2；
第三步、将现有圆柱叶片顶部凹侧曲线在P1点处沿切向延伸，绘制圆弧R1段；再绘制延伸曲线与凸侧曲线的相切圆弧R3；
第四步、将现有圆柱叶片底部凹侧曲线在P2点处沿切向延伸，绘制圆弧R2段，再绘制延伸曲线与凸侧曲线相切的圆弧R4；
第五步、以R3圆弧为起始，以R4圆弧为终止，用圆弧面光滑的从R3过渡到R4，使R4段半径大于R3段半径，形成由底部到顶部的拔模斜度。
本说明书中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。

Claims (3)

  1. 一种离心泵叶轮圆柱叶片进口边曲面工艺方法，其特征在于，包括以下步骤：
    第一步、以现有圆柱叶片叶轮的圆心为圆心绘制直径为D1和D2的圆，直径为D1的圆为改进后的叶片顶部进口位置，直径为D2的圆是改进后的叶片底部进口位置；
    第二步、在现有圆柱叶片顶部凹侧曲线上确定一个距离圆心S1的点P1；在叶片底部凹侧曲线上确定一个距离圆心S2的点P2；
    第三步、将现有圆柱叶片顶部凹侧曲线在P1点处沿切向延伸，绘制圆弧R1段；再绘制延伸曲线与凸侧曲线的相切圆弧R3；
    第四步、将现有圆柱叶片底部凹侧曲线在P2点处沿切向延伸，绘制圆弧R2段，再绘制延伸曲线与凸侧曲线相切的圆弧R4；
    第五步、以R3圆弧为起始，以R4圆弧为终止，用圆弧面光滑的从R3过渡到R4，使R4段半径大于R3段半径，形成由底部到顶部的拔模斜度。
  2. 根据权利要求1所述的离心泵叶轮圆柱叶片进口边曲面工艺方法，其特征在于，距离S1＝(1.1-1.3)×(D1)/2。
  3. 根据权利要求1所述的离心泵叶轮圆柱叶片进口边曲面工艺方法，其特征在于，距离S2＝(1.1-1.3)×(D2)/2。
PCT/CN2020/090769 2019-05-29 2020-05-18 一种离心泵叶轮圆柱叶片进口边曲面工艺方法 Ceased WO2020238669A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2019521.0A GB2588335B (en) 2019-05-29 2020-05-18 Curved surface process method for inlet edge of cylindrical blade of centrifugal pump impeller
US17/251,816 US11333161B2 (en) 2019-05-29 2020-05-18 Curved surface processing method for inlet edge of cylindrical blade of centrifugal pump impeller
JP2020569908A JP6963852B2 (ja) 2019-05-29 2020-05-18 遠心ポンプ羽根車の円柱羽根の吸入側曲面の加工方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910455788.8A CN110185654B (zh) 2019-05-29 2019-05-29 一种离心泵叶轮圆柱叶片进口边曲面工艺方法
CN201910455788.8 2019-05-29

Publications (1)

Publication Number Publication Date
WO2020238669A1 true WO2020238669A1 (zh) 2020-12-03

Family

ID=67718396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/090769 Ceased WO2020238669A1 (zh) 2019-05-29 2020-05-18 一种离心泵叶轮圆柱叶片进口边曲面工艺方法

Country Status (5)

Country Link
US (1) US11333161B2 (zh)
JP (1) JP6963852B2 (zh)
CN (1) CN110185654B (zh)
GB (1) GB2588335B (zh)
WO (1) WO2020238669A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185654B (zh) * 2019-05-29 2021-04-20 江苏大学 一种离心泵叶轮圆柱叶片进口边曲面工艺方法
CN111127419B (zh) * 2019-12-20 2023-06-09 石家庄铁道大学 一种轮对标准圆多边形检测方法、装置及终端设备
CN116771715B (zh) * 2023-06-30 2026-02-10 宁波方太厨具有限公司 叶轮及具有该叶轮的离心泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133936A1 (de) * 2001-07-12 2003-01-30 Buhler Motor Gmbh Kreiselpumpenlaufrad
CN201288694Y (zh) * 2008-10-07 2009-08-12 石家庄工业水泵有限公司 一种高效渣浆泵
CN104314860A (zh) * 2014-09-24 2015-01-28 江苏大学 一种低比速离心泵叶轮
CN110185654A (zh) * 2019-05-29 2019-08-30 江苏大学 一种离心泵叶轮圆柱叶片进口边曲面工艺方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708368C2 (de) * 1977-02-26 1983-03-24 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Laufrad für Kreiselpumpen
US4790720A (en) * 1987-05-18 1988-12-13 Sundstrand Corporation Leading edges for diffuser blades
WO1994011638A1 (en) * 1992-11-12 1994-05-26 Magiview Pty Ltd An impeller
DE4424996A1 (de) * 1994-07-15 1996-01-18 Oase Pumpen Kreiselpumpe, insbesondere für Springbrunnen
CN101368574A (zh) * 2008-10-15 2009-02-18 许洪元 两相流泵叶轮的设计方法
US20100284812A1 (en) * 2009-05-08 2010-11-11 Gm Global Technology Operations, Inc. Centrifugal Fluid Pump
CN203404124U (zh) * 2013-06-24 2014-01-22 江苏大学 一种低比转数叶轮
CN105849418B (zh) * 2013-12-27 2018-11-13 本田技研工业株式会社 叶轮
CN203892243U (zh) * 2014-04-04 2014-10-22 上海第一水泵厂有限公司 用于水煤浆泵的叶轮
US10584705B2 (en) * 2015-04-30 2020-03-10 Zhejiang Sanhua Automotive Components Co., Ltd. Centrifugal pump and method for manufacturing the same
CN105134646B (zh) 2015-08-25 2017-12-01 西华大学 可控进口安放角圆柱形叶片的设计方法
CN205025816U (zh) * 2015-09-17 2016-02-10 宜兴市宙斯泵业有限公司 一种衬塑防腐泵用半开式塑料叶轮
CN108131327B (zh) * 2017-12-20 2019-12-31 江苏大学 一种基于固液两相流的离心泵的设计方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133936A1 (de) * 2001-07-12 2003-01-30 Buhler Motor Gmbh Kreiselpumpenlaufrad
CN201288694Y (zh) * 2008-10-07 2009-08-12 石家庄工业水泵有限公司 一种高效渣浆泵
CN104314860A (zh) * 2014-09-24 2015-01-28 江苏大学 一种低比速离心泵叶轮
CN110185654A (zh) * 2019-05-29 2019-08-30 江苏大学 一种离心泵叶轮圆柱叶片进口边曲面工艺方法

Also Published As

Publication number Publication date
JP6963852B2 (ja) 2021-11-10
GB2588335A (en) 2021-04-21
CN110185654B (zh) 2021-04-20
US20210364007A1 (en) 2021-11-25
US11333161B2 (en) 2022-05-17
GB2588335B (en) 2021-10-06
JP2021521381A (ja) 2021-08-26
CN110185654A (zh) 2019-08-30
GB202019521D0 (en) 2021-01-27

Similar Documents

Publication Publication Date Title
WO2020238669A1 (zh) 一种离心泵叶轮圆柱叶片进口边曲面工艺方法
CN109882446B (zh) 一种低比速离心泵叶轮分流叶片的设计方法
CN102182707A (zh) 一种吸油烟机用离心风机及其蜗壳型线生成方法
CN115978005B (zh) 导流叶片及其设计方法、扩压器、压气机及增压器
CN111828387B (zh) 一种大流量低速风机的风叶
CN101900134A (zh) 一种新型的圆弧斜槽处理机匣
CN103644140B (zh) 一种潜水轴流泵导叶设计方法及潜水轴流泵导叶
CN101705949B (zh) 一种吸油烟机的离心风机蜗壳
CN113446258B (zh) 一种增压式泵装置
CN108980103B (zh) 一种带进口小翼的前向多翼离心通风机叶轮的设计方法
CN204663967U (zh) 一种与径向导叶匹配的多级离心泵叶轮
CN217558628U (zh) 一种离心通风机的进风口
CN108005956A (zh) 一种汽车空调用蜗壳结构
CN216812286U (zh) 一种进风口及其后向离心通风机
CN113775533B (zh) 一种用于火箭发动机的涡轮泵装置
CN107975497A (zh) 一种离心风机蜗壳
CN205422837U (zh) 一种带有动叶片前部消涡孔结构的变几何涡轮
CN101737359A (zh) 开槽位置为正弦分布的离心压气机非对称自循环处理机匣
CN213953989U (zh) 一种轴流风轮及应用该轴流风轮的风机
CN206309647U (zh) 一种双蜗壳离心泵
CN211924555U (zh) 一种带分离式叶片的离心泵叶轮
CN108131324A (zh) 一种高效低噪音小型多翼离心排气扇及叶轮
CN201902375U (zh) 吸油烟机的离心风机蜗壳
CN106089797B (zh) 一种离心泵叶片的尾部修型方法、离心泵叶轮及离心泵
CN219548926U (zh) 一种喷嘴环叶片、蜗壳喷嘴环

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 202019521

Country of ref document: GB

Kind code of ref document: A

Free format text: PCT FILING DATE = 20200518

ENP Entry into the national phase

Ref document number: 2020569908

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20815190

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20815190

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 20815190

Country of ref document: EP

Kind code of ref document: A1

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205N DATED 25.01.2022)