CN107299909B - A kind of low NPSHr method for designing impeller - Google Patents
A kind of low NPSHr method for designing impeller Download PDFInfo
- Publication number
- CN107299909B CN107299909B CN201610457342.5A CN201610457342A CN107299909B CN 107299909 B CN107299909 B CN 107299909B CN 201610457342 A CN201610457342 A CN 201610457342A CN 107299909 B CN107299909 B CN 107299909B
- Authority
- CN
- China
- Prior art keywords
- impeller
- npshr
- rice
- pump
- inlet
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 230000029142 excretion Effects 0.000 claims abstract description 7
- 241000209094 Oryza Species 0.000 claims description 15
- 235000007164 Oryza sativa Nutrition 0.000 claims description 15
- 235000009566 rice Nutrition 0.000 claims description 15
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 230000008016 vaporization Effects 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 210000003934 vacuole Anatomy 0.000 description 1
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
- F04D29/24—Vanes
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Hydraulic Turbines (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
The present invention relates to a kind of low NPSHr method for designing impeller, the required cavitation surplus NPSHr relevant parameter mainly for vane pump is provided：The required cavitation surplus NPSHr of vane pump minimum(min), minimum required cavitation surplus COEFFICIENT Kp, vane inlet excretion coefficient ξ that liquid is flowed0, modified impeller inlet diameter Dp, modified impeller inlet equivalent diameter Dp0, by improving impeller parameters, the anti-cavitation performance of vane pump is improved, the stability of vane pump is improved, achievees the purpose that the service life for extending pump and associated components.
Description
Technical field
The present invention relates to a kind of impeller of vane pump design method, in particular to a kind of low NPSHr method for designing impeller.
Background technique
When cavitation phenomenon refers to that the fluid field pressure in liquid stream is reduced under the steam pressure of saturation, liquid will be by liquid
It is changed into the gaseous state vacuole full of steam, so that its thermodynamic state is changed.Cavitation is also known as cavitation, cavitation phenomenon pump,
Often occur in the fluid machineries such as jet pipe, propeller, the hydraulic turbine, especially in vane pump.
Performance of the cavitation in addition to reducing hydraulic, permanent cavitation also will cause the destruction of material surface, reduce overcurrent
The mechanical strength and overcurrent performance of component, and it will cause flow field internal irregularities for instantaneous cavitation, generate vibration and noise, these
The structure that unstable pressure and oscillation may cause flow passage components is destroyed.
It is the fundamental equation for describing pump cavitation there are two fundamental equation in blade pump cavitation governing equation：Device cavitation
Surplus NPSHa and pump cavitation surplus NPSHr.Device cavitation surplus NPSHa is also known as effective cavitation surplus, is mentioned by suction apparatus
Supply, have in the entrance Unit Weight liquid of pump be more than pressure for vaporization head power surplus, i.e. liquid at pump inlet
The total head having subtracts the only surplus value of pressure for vaporization head.Pump cavitation surplus NPSHr is related with pump internal flow situation, is
It itself is determined by pump.NPSHr characterizes the pressure drop of pump inlet part, cavitation does not just also occur in order to guarantee to pump, it is desirable that pumping
Entrance Unit Weight liquid has the power surplus more than pressure for vaporization head, and physical significance indicates liquid in pump inlet portion
The degree of partial pressure drop.Since pump cavitation surplus NPSHr is itself to determine that the present invention is mainly to pump cavitation surplus by pump
NPSHr is optimized.
Seldom minimum pump cavitation surplus NPSHr is described in design in the design process of the vane pump of the prior art, right
The cavitation description inaccuracy of itself is pumped, therefore is easy to appear blade pump cavitation, to cause blade pump speed more than specified turn
Cavitation phenomenon occurs when fast.
Application No. is No. 201510679202.8 Chinese invention patents to disclose a kind of high anti-cavitation centrifugal impeller waterpower
Design method, this design method are by improving the import laying angle of blade, vane thickness distribution, impeller inlet diameter and leaf
Piece entrance width can reduce the bending degree of blade, increase the area of passage of vane inlet, improve the efficiency of centrifugal pump,
Cavitation surplus reduces, and cavitation performance is improved.Make impeller channel by different leaves number and specific speed to design subtended angle of blade
Interior flowing, which is spread, to be reduced, and flowing is reduced closer to blade shape since the whirlpool of the separation of flow is spread to high-pressure side.But it is above-mentioned special
In benefit mention parameter description pump cavitation surplus NPSHR is not described, do not establish yet pump cavitation surplus NPSHR with
The relationship of impeller basic parameter.
For above-mentioned defect, the present inventor has invented a kind of low NPSHr method for designing impeller, to pump cavitation surplus
NPSHr has carried out accurate description, obtains minimum pump cavitation surplus, to alleviate vane pump in certain degree in the feelings of stall
The problem of cavitation occurs under condition, ensure that the anti-cavitation performance of vane pump.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of low NPSHr method for designing impeller.By accurately describing to pump
Cavitation surplus NPSHr improves vane pump anti-cavitation performance.
Realizing technical solution used by above-mentioned purpose is：
1, first with common calculation method by initial impeller inlet equivalent diameter D0With impeller outlet diameter D2It is calculated.
2, the excretion coefficient ξ that vane inlet flows liquid0
In formula：
D0- initial impeller inlet equivalent diameter, rice；
ξ0The excretion coefficient that-vane inlet flows liquid；
N-design conditions revolving speed, rev/min；
D2- impeller outlet diameter, rice；
β0 *Shroud blade section blade exit laying angle before-impeller, degree；
3, minimum required cavitation surplus COEFFICIENT Kp
In formula：
KpThe required cavitation surplus coefficient of-minimum；
D0- initial impeller inlet equivalent diameter, rice；
D2- impeller outlet diameter, rice；
ξ0The excretion coefficient that-vane inlet flows liquid；
Q-design conditions flow, rice3/ the second；
N-design conditions revolving speed, rev/min；
4, modified impeller inlet diameter Dp
Dp=Kp·(Q/n)1/3
In formula：
KpThe required cavitation surplus coefficient of-minimum；
Q-design conditions flow, m3/s；
N-design conditions revolving speed, rev/min；
5, modified impeller inlet equivalent diameter Dp0
Dp0=Dp·(1-r2)1/2
In formula：
Dp0- modified impeller inlet equivalent diameter, rice；
Dp- modified impeller inlet diameter, rice；
R-impeller hub radius, rice.
According to above-mentioned steps, a kind of available low NPSHr Paddle Pump Designing method.
Detailed description of the invention
The present invention is further described with reference to the accompanying drawings and detailed description.
Fig. 1 is centrifugal pump impeller axial plane figure.
Specific embodiment
The present invention mainly improves vane pump anti-cavitation performance by accurately describing pump cavitation surplus NPSHr, slows down
The cavitation of blade.
This embodiment is to be improved on the basis of giving original vane pump the cavitation surplus NPSHr of vane pump：
Fig. 1 has determined the present embodiment：
1, first with common calculation method by initial impeller inlet equivalent diameter D0With impeller outlet diameter D2It is calculated.
2, the excretion coefficient ξ that vane inlet flows liquid0
3, minimum required cavitation surplus COEFFICIENT Kp
4, modified impeller inlet diameter Dp
Dp=Kp·(Q/n)1/3
5, modified impeller inlet equivalent diameter Dp0
Dp0=Dp·(1-r2)1/2
Claims (1)
1. a kind of low NPSHr method for designing impeller provides the required cavitation surplus NPSHr correlation ginseng mainly for vane pump
Number：The required cavitation surplus NPSHr of vane pump minimum(min), minimum required cavitation surplus COEFFICIENT Kp, vane inlet flows liquid
Excretion coefficient ξ0, modified impeller inlet diameter Dp, modified impeller inlet equivalent diameter Dp0, it is characterised in that：Impeller
It is suitble to following relationship between geometric parameter and pump operating point for design performance parameter：
Dp=Kp·(Q/n)1/3 (4)
Dp0=Dp·(1-r2)1/2 (5)
In formula：
NPSHr(min)The required cavitation surplus of-minimum, rice；
Dp0- modified impeller inlet equivalent diameter, rice；
D0- initial impeller inlet equivalent diameter, rice；
KpThe required cavitation surplus coefficient of-minimum；
ξ0The excretion coefficient that-vane inlet flows liquid；
Q-design conditions flow, rice3/ the second；
N-design conditions revolving speed, rev/min；
D2- impeller outlet diameter, rice；
β0 *Shroud blade section blade exit laying angle before-impeller, degree；
Dp- modified impeller inlet diameter, rice；
R-impeller hub radius, rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610457342.5A CN107299909B (en) | 2016-06-22 | 2016-06-22 | A kind of low NPSHr method for designing impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610457342.5A CN107299909B (en) | 2016-06-22 | 2016-06-22 | A kind of low NPSHr method for designing impeller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107299909A CN107299909A (en) | 2017-10-27 |
| CN107299909B true CN107299909B (en) | 2018-11-30 |
Family
ID=60136963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610457342.5A Active CN107299909B (en) | 2016-06-22 | 2016-06-22 | A kind of low NPSHr method for designing impeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107299909B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016396A (en) * | 2012-12-11 | 2013-04-03 | 江苏大学 | Centrifugal pump hydraulic design method controlling maximum flow by cavitation |
| EP2589811A2 (en) * | 2011-11-03 | 2013-05-08 | Assoma Inc. | Magnetic drive pump |
| CN103994105A (en) * | 2014-04-29 | 2014-08-20 | 江苏大学 | Impeller hydraulic power design method for low-cavitation non-load centrifugal pump |
| CN105298908A (en) * | 2015-10-16 | 2016-02-03 | 江苏大学 | High-cavitation-resistance centrifugal impeller hydraulic design method |
-
2016
- 2016-06-22 CN CN201610457342.5A patent/CN107299909B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2589811A2 (en) * | 2011-11-03 | 2013-05-08 | Assoma Inc. | Magnetic drive pump |
| CN103016396A (en) * | 2012-12-11 | 2013-04-03 | 江苏大学 | Centrifugal pump hydraulic design method controlling maximum flow by cavitation |
| CN103994105A (en) * | 2014-04-29 | 2014-08-20 | 江苏大学 | Impeller hydraulic power design method for low-cavitation non-load centrifugal pump |
| CN105298908A (en) * | 2015-10-16 | 2016-02-03 | 江苏大学 | High-cavitation-resistance centrifugal impeller hydraulic design method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107299909A (en) | 2017-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3872966B2 (en) | Axial fluid machine | |
| CN107559238B (en) | An inlet guide device for improving cavitation performance of canned pump | |
| Cao et al. | Low speed design of rear rotor in contra-rotating axial flow pump | |
| CN103557186A (en) | Adjustable axial flow pump with front guide vanes | |
| Cui et al. | Experimental and numerical study of the performance and cavitation flow of centrifugal pump with jetting device | |
| CN103775377A (en) | Torque flow pump hydraulic design method by adopting long-short vanes | |
| CN103883555B (en) | Mixed-flow double-suction pump impeller Hydraulic Design Method | |
| CN104047898A (en) | Guide vanes with vortex elimination and drag reduction holes | |
| Zhou et al. | Effect of reflux hole on the transient flow characteristics of the self-priming sewage centrifugal pump | |
| CN104832460B (en) | A Diffusion Guide Ring Matching the Radial Asymmetric Guide Vane Body of the Pump | |
| CN110821844B (en) | A cryogenic submersible pump with a guide vane ring inside | |
| CN105275880B (en) | A mixed-flow nuclear main pump | |
| CN107299909B (en) | A kind of low NPSHr method for designing impeller | |
| CN1702317A (en) | Mixed flow water turbine with an eddy suppressor | |
| CN113187769A (en) | Layered staggered guide vane with low noise characteristic | |
| CN206487678U (en) | A kind of low NPSHr vane pumps | |
| Li et al. | Rotating stall region of water-jet pump | |
| CN202883498U (en) | Suction inlet of improving centrifugal pump cavitation performances | |
| Moloshnyi et al. | Influence of an inlet rotating axial device on the cavitation processes in a low specific speed centrifugal pump | |
| CN102927060B (en) | A kind of suction port improving cavitation performance of centrifugal pump | |
| CN103233914A (en) | Guide axial flow pump impeller | |
| Salunkhe et al. | A Review on Improvement of Efficiency of Centrifugal Pump Through Modifications in Suction Manifold | |
| CN109715907B (en) | A device for dividing a mass flow into two sub-mass flows | |
| Zhang et al. | Performance improvement of a centrifugal compressor stage by using different vaned diffusers | |
| CN106593955B (en) | A kind of mixed-flow core main pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |