NL2030481A - Semi-open Centrifugal Pump Impeller Structure - Google Patents

Semi-open Centrifugal Pump Impeller Structure Download PDF

Info

Publication number
NL2030481A
NL2030481A NL2030481A NL2030481A NL2030481A NL 2030481 A NL2030481 A NL 2030481A NL 2030481 A NL2030481 A NL 2030481A NL 2030481 A NL2030481 A NL 2030481A NL 2030481 A NL2030481 A NL 2030481A
Authority
NL
Netherlands
Prior art keywords
semi
centrifugal pump
tip
blade
hub
Prior art date
Application number
NL2030481A
Other languages
Dutch (nl)
Inventor
Li Chenhao
Zhu Guojun
Feng Jianjun
Lu Jinlin
Luo Xingqi
Wang Like
Original Assignee
Univ Xian Technology
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 Univ Xian Technology filed Critical Univ Xian Technology
Publication of NL2030481A publication Critical patent/NL2030481A/en

Links

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
    • 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • 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
    • F05D2240/307—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 tip of a rotor blade

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

Disclosed is a semi-open centrifugal pump impeller structure, which comprises a hub; the 5 hub is provided with a main blade, and the end of the main blade far away from the hub is provided with a tip wing along the length direction. The semi-open centrifugal pump impeller structure according to the present invention can reduce the relative flow angle of the blade inlet by arranging the tip wing, so that the low-speed region of the impeller inlet is transferred from the middle of the flow channel to the blade suction surface, the area and intensity of the reverse flow 10 region on the blade suction surface are obviously reduced, the intensity is weakened, and the trend of extending downstream is enhanced, the blocking effect on the mainstream and the tip blockage are weakened, the tip blockage is reduced, and the hydraulic loss of the flow components is reduced, thus increasing the Euler head of the impeller, and increasing the head and efficiency of the pump.

Description

Semi-open Centrifugal Pump Impeller Structure
TECHNICAL FIELD The invention belongs to the technical field of fluid machinery and engineering equipment, and specifically to a semi-open centrifugal pump impeller structure.
BACKGROUND Semi-open impeller centrifugal pump has the advantages of convenient maintenance and transportation of viscous fluid, and is widely used in various fields such as military, industrial and civil. However, due to the existence of tip clearance, leakage flow will occur under the action of pressure difference between blade pressure surface and suction surface, and leakage vortex will be formed with mainstream entrainment. The interaction of various vortex structures with different strengths and scales will worsen the internal flow field of impeller, resulting in a significant increase in leakage rate and flow loss. Therefore, the working capacity and stability of the semi-open centrifugal pump are reduced, the head and efficiency are obviously decreased, and a large amount of energy is wasted, which becomes one of the bottlenecks restricting the development of the semi-open impeller centrifugal pump.
The tip clearance has the most obvious influence on the external characteristics. The larger tip clearance will lead to a substantial increase of the tip leakage flow intensity and flow loss, which will lead to the working ability, performance decline, and stability of the impeller decline. When the semi-open impeller centrifugal pump deviates from the design working condition, the relative flow angle of the fluid at the blade inlet will deviate from the blade angle, and an attack angle will be formed at the blade inlet. In the process of fluid flow from the inlet to the outlet of the impeller, it is easier to generate boundary layer flow separation, and a large number of unsteady flows such as backflow, secondary flow and shedding flow will be formed in the impeller. Moreover, due to the existence of leakage flow, the unstable flows in the impeller will be aggravated, and the flow passage will be seriously blocked, resulting in the increase of hydraulic loss in the pump, the decrease of head and efficiency. Thus it will adversely affect the long-term safe and economic operation of the centrifugal pump system.
SUMMARY The objective of the invention is to provide a semi-open centrifugal pump impeller structure, which solves the problem of performance degradation caused by leakage flow formed by tip clearance of the existing impeller structure.
The technical scheme adopted by the invention is as follows: a semi-open centrifugal pump impeller structure comprises a hub, the hub is provided with a main blade, and the end of the main blade away from the hub is provided with a tip wing along the length direction of the main blade.
The invention is also characterized in that: the thickness of the tip wing gradually increases linearly from near to far along the height direction of the main blade.
The cross section of the tip wing along the height direction of the main blade is isosceles trapezoid, and the top edge of the isosceles trapezoid is connected with the main blade, and the length of the top edge is equivalent to the thickness of the main blade.
The bottom edge length of isosceles trapezoid is twice that of the top.
The distance between the bottom edge of the isosceles trapezoid to the front wall surface is half of the height of the tip wing.
The invention has the beneficial effects that: the semi-open centrifugal pump impeller structure according to the present invention can reduce the relative liquid flow angle of the blade inlet by arranging the tip wing, so that the low-speed region of the impeller inlet is transferred from the middle of the flow channel to the blade suction surface, the area and intensity of the reverse flow region on the blade suction surface are obviously reduced, and the trend of extending downstream is enhanced, the blocking effect on the mainstream and tip blockage are weakened, and the hydraulic loss of the flow components is reduced, thus increasing the Euler head of the impeller, and the head and efficiency of the pump.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a structural schematic diagram of a semi-open centrifugal pump impeller structure according to the present invention; FIG. 2 is a sectional view A-A of the semi-open centrifugal pump impeller structure according to the present invention in FIG. 1; FIG. 3 is a schematic diagram of flow-head, flow-efficiency comparison curves between centrifugal pump and original centrifugal pump adopting a semi-open centrifugal pump impeller structure according to the present invention.
In the figures, 1. main blade, 2. hub, 3. tip wing, 4. front wall surface.
DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the accompanying drawings and detailed embodiments.
The invention provides a semi-open centrifugal pump impeller structure, as shown in FIG. 1 and FIG. 2, including a hub 2; a main blade 1 is arranged on the hub 2, a tip wing 3 is arranged at the end of the main blade 1 away from the hub 2 along the length direction of the main blade 1, and the radial positions of the leading edge, pressure surface, suction surface and trailing edge of the tip wing 3 are the same as those of the main blade 1, and the contour shapes of the tip wing 3 and the main blade 1 are similar; the distance between the bottom edge of the tip wing 3 to the front wall surface 4 (which is equivalent to the hub of the closed centrifugal pump; in the semi-open centrifugal pump, the blade is connected with the hub, and there is a clearance between the blade and the front wall surface) is half of the height of the tip wing 3 (in the y-axis direction of FIG. 2), and the thickness of the tip wing 3 (in the x-axis direction of FIG. 2) gradually increases linearly from near to far along the height direction of the main blade 1 (in the y-axis direction of FIG. 2). The cross section of the tip wing 3 along the height direction of the main blade 1 is preferably isosceles trapezoid, the top edge of the isosceles trapezoid is connected with the main blade 1, and the top edge length is equivalent to the thickness of the main blade 1 (in the x-axis direction of FIG. 2}, and the bottom edge length of the isosceles trapezoid is twice the top edge length.
The embodiment is applied to a semi-open centrifugal pump impeller, with 6 blades, design speed of 980 r/min, design flow rate of 47 m3/h and design head of 7 m. The addition of the tip wing 3 changes the shape of the blade near the tip clearance, reduces the tip leakage, weakens the blocking effect of the leakage flow on the mainstream, reduces the tip blockage, effectively improves the work capacity of the impeller, reduces the hydraulic loss in the impeller, and increases the head and efficiency. FIG. 3 shows that the head and efficiency are obviously improved after adopting the impeller structure of the present invention, and the maximum head and maximum efficiency are increased by 3% and 1.6% respectively.
In this way, the semi-open centrifugal pump impeller structure of the present invention can reduce the relative flow angle of the blade inlet by arranging the tip wing 3, so that the low-speed region of the impeller inlet is transferred from the middle of the flow channel to the blade suction surface, the area and intensity of the reverse flow region on the blade suction surface are obviously reduced, and the trend of extending downstream is enhanced, the blocking effect on the mainstream and the tip blockage are weakened, and the hydraulic loss of the flow components is reduced, thus increasing the Euler head of the impeller, and the head and efficiency of the pump.

Claims (5)

CONCLUSIESCONCLUSIONS 1. Een schoepenstructuur voor een half open centrifugaalpomp, die een naaf (2) omvat, waarbij de naaf (2) is voorzien van een hoofdblad (1), waarbij het uiteinde van het hoofdblad (1) aan de van de naaf (2) afgekeerde zijde langs de lengterichting van de hoofdschoep (1) is voorzien van een tipvleugel (3).A vane structure for a semi-open centrifugal pump comprising a hub (2), the hub (2) having a main blade (1), the end of the main blade (1) meeting the end of the hub (2) the opposite side along the longitudinal direction of the main blade (1) is provided with a tip wing (3). 2. De schoepenstructuur voor een half open centrifugaalpomp volgens conclusie 1, waarbij de dikte van de tipvleugel (3) van dichtbij naar veraf langs de hoogterichting van de hoofdschoep (1) geleidelijk lineair toeneemt.The vane structure for a semi-open centrifugal pump according to claim 1, wherein the thickness of the tip vane (3) gradually increases linearly from near to far along the height direction of the main vane (1). 3. De schoepenstructuur voor een half open centrifugaalpomp volgens conclusie 1 of 2, waarbij de dwarsdoorsnede van de tipvleugel (3) langs de hoogterichting van het hoofdblad (1) een gelijkbenig trapezium is, en de bovenrand van het gelijkbenig trapezium verbonden is met het hoofdblad (1) en de lengte van de bovenrand gelijk is aan de dikte van het hoofdblad (1).The vane structure for a semi-open centrifugal pump according to claim 1 or 2, wherein the cross section of the tip vane (3) along the height direction of the main blade (1) is an isosceles trapezoid, and the top edge of the isosceles trapezoid is connected to the main blade (1) and the length of the top edge is equal to the thickness of the main blade (1). 4. De schoepenstructuur voor een half open centrifugaalpomp volgens conclusie 3, waarbij de lengte van de onderrand van het gelijkbenige trapezium twee keer zo lang is als die van de bovenrand.The vane structure for a semi-open centrifugal pump according to claim 3, wherein the length of the lower edge of the isosceles trapezoid is twice as long as that of the upper edge. 5. De schoepenstructuur voor een half open centrifugaalpomp volgens conclusie 1 of 4, waarbij de afstand tussen de onderrand van de tipvleugel (3) en het oppervlak van voorwand (4) de helft van de hoogte van de tipvleugel (3) bedraagt.The vane structure for a semi-open centrifugal pump according to claim 1 or 4, wherein the distance between the lower edge of the tip vane (3) and the surface of the front wall (4) is half the height of the tip vane (3).
NL2030481A 2021-04-09 2022-01-09 Semi-open Centrifugal Pump Impeller Structure NL2030481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110386192.4A CN113236601A (en) 2021-04-09 2021-04-09 Semi-open type centrifugal pump impeller structure

Publications (1)

Publication Number Publication Date
NL2030481A true NL2030481A (en) 2022-10-19

Family

ID=77127982

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2030481A NL2030481A (en) 2021-04-09 2022-01-09 Semi-open Centrifugal Pump Impeller Structure

Country Status (2)

Country Link
CN (1) CN113236601A (en)
NL (1) NL2030481A (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2782937Y (en) * 2005-03-10 2006-05-24 上海大学 Mechanical vane of impeller for inhibiting top gap leakage
CN201159202Y (en) * 2008-02-28 2008-12-03 大连海事大学 Moving blade tip winglet of compressor
CN109162956B (en) * 2018-09-13 2020-11-03 清华大学 T-shaped blade top for inhibiting leakage vortex of blade top gap in pump and pump with T-shaped blade top
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

Also Published As

Publication number Publication date
CN113236601A (en) 2021-08-10

Similar Documents

Publication Publication Date Title
CN105650032B (en) The diffuser of centrifugal compressor
CN108397237B (en) Composite winglet
CN107050542B (en) Miniature centrifugal blood pump capable of preventing blood cells from being damaged and circulating blood supply method thereof
CN111425450A (en) Centrifugal pump blade with bionic sawtooth structure at front edge and tail edge
CN106704259A (en) Blade
CN110529426B (en) Open impeller structure for high-speed pump
NL2030481A (en) Semi-open Centrifugal Pump Impeller Structure
CN111886411B (en) Guide vane of water turbine or water pump
CN210769502U (en) Centrifugal pump impeller capable of actively controlling pressure pulsation
CN112523809A (en) Method for inhibiting unsteady airflow excitation force of turbine rotor blade
CN103233914B (en) Guide axial flow pump impeller
CN110863862A (en) Blade tip structure and turbine
CN104791293A (en) Method for improving cavitation-erosion performance of centrifugal pump
CN210769506U (en) Open impeller structure for high-speed pump
CN114837992A (en) Cavitation erosion resistant centrifugal pump blade
CN206360924U (en) A kind of centrifugal pump impeller
CN104279180A (en) Double-suction impeller
CN212202595U (en) Centrifugal pump blade with bionic sawtooth structure at front edge and tail edge
CN109882444B (en) Mixed flow pump impeller with stepped rectifying device in flow channel
CN204113732U (en) A kind of double-entry impeller
CN207080398U (en) Plastic cutter formula sealing ring
CN113187729B (en) Axial-flow pump for controlling eddy current and improving performance
JPH09264296A (en) Impeller for eccentric fluid machinery
CN106015084B (en) A kind of centrifugal pump impeller for reducing flow
CN109779978B (en) Guide vane of centrifugal pump