CN104895832B - A kind of Hydraulic Design Method of high viscosity centrifugal pump impeller - Google Patents
A kind of Hydraulic Design Method of high viscosity centrifugal pump impeller Download PDFInfo
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- CN104895832B CN104895832B CN201510344484.6A CN201510344484A CN104895832B CN 104895832 B CN104895832 B CN 104895832B CN 201510344484 A CN201510344484 A CN 201510344484A CN 104895832 B CN104895832 B CN 104895832B
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Abstract
The present invention relates to a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller.The present invention considers the physical characteristic of high viscosity fluid, the appropriate area of passage for increasing runner, the Hydraulic Design is carried out to high viscosity centrifugal pump impeller using the knowwhy and conventional outstanding hydraulic model design feature of velocity-coefficient method and integrated fluid mechanics, it is had higher efficiency and good nonblocking performance.The invention provides a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller, main design parameters mainly include：1. impeller inlet diameter D1, 2. impeller hub diameter dh, 3. vane inlet laying angle β1, 4. blade exit laying angle β2, 5. impeller outlet diameter D2, 6. blade exit width b2, 7. number of blade z, 8. subtended angle of blade φ etc..Its advantage is：Stable working, efficiency high, nonblocking performance is good, and the scope of application is more extensive.
Description
Technical field
The present invention relates to a kind of Hydraulic Design Method of high viscosity centrifugal pump, it is mainly used in industry as transfer of highly viscous
Liquid is used, it can also be used to the industry such as electric power, metallurgy, coal transmit the slurry containing solid particle, and ensure its high efficiency and
Good nonblocking performance.
Background technology
High-viscosity pump is mainly used in the conveying of industrial production medium-high viscosity liquid, and domestic demand is huge, and high viscous in industry
Using the structure design of gear pump and helicoidal pump more than degree pump, this high-viscosity pump efficiency is low, flow is small, and pulsation is big, and noise is big etc.
Shortcoming.It is big and adjustable with flow and the invention of high viscosity centrifugal pump solves the deficiency of traditional high-viscosity pump, efficiency high, work
The features such as making steady.Impeller is the main flow passage components of high viscosity centrifugal pump, directly affects the performance characteristics of high viscosity centrifugal pump,
Traditional centrifugal pump Hydraulic Design Method has velocity-coefficient method, scale model scaling method, increasing discharge method etc., mainly according to one
A little outstanding hydraulic models carry out Similar improvement, the design of pump are not optimized from theoretic.The present invention is examined
Consider the physical characteristic of high viscosity fluid, the appropriate area of passage for increasing runner, using velocity-coefficient method and integrated fluid mechanics
Knowwhy and conventional outstanding hydraulic model design feature the Hydraulic Design is carried out to high viscosity centrifugal pump impeller, make its have compared with
High efficiency and good nonblocking performance.
The content of the invention
The purpose of the present invention designs one in the case of corresponding design requirement parameter (flow Q, lift H etc.) is provided
There are greater efficiency and good nonblocking performance high viscosity centrifugal pump, hydrodynamic viscosity model is applied to the invention provides one kind
Enclose the Hydraulic Design Method of the centrifugal pump impeller for 0.01~100mPas.
Above-mentioned purpose is realized, the method for designing of use is as follows：
1) is designed to impeller outlet diameter:
D21=(1.35~1.55) D2
2) is designed to impeller inlet diameter:
D1=0.04087ns 0.5353·D21
3) is designed to impeller outlet hem width degree:
b21=(1.5~1.8) b2；
4) is designed to impeller blade cornerite:
5) is according to the suitable number of blade of selection of specific speed of pump：
In formula：
D2- impeller outlet diameter, mm；
D21- high viscosity centrifugal pump impeller outlet diameter, mm；
ns- high viscosity centrifuges pump specific angular speed；
Q-pump discharge, m3/h；
Kd- proportionality coefficient；
N-revolution speed, r/min；
D1- impeller inlet diameter, mm；
μ-dynamic viscosity, mPas；
b2- Ordinary Centrifugal Pumps blade exit width, mm；
b21- high viscosity centrifugal blade exit width, mm；
- impeller blade cornerite, ο；
Z-impeller blade number；
6) impeller outlets diameter withIt is proportional, by a large amount of outstanding high viscosity Excellent Hydraulic Model Database of Centrifugal Pump and
Design experiences determine the interval Proportional coefficient K of different specific speedd。
7) determines the impeller inlet diameter of pump according to impeller outlet diameter, is centrifuged by a large amount of outstanding high viscositys of research
Pump hydraulic model finds that impeller imports and exports the ratio of diameter under a certain specific speedThere is optimum interval, ratio ε is most
There is exponential relationship ε=0.04087n in the figure of merit and specific speeds 0.5353, by impeller outlet diameter can more preferable more system determination
The impeller inlet diameter of pump.
8) Hydraulic Design Methods according to claim 1, it is characterised in that：Impeller blade exit width and
It is directly proportional, according to substantial amounts of outstanding high viscosity Excellent Hydraulic Model Database of Centrifugal Pump database, sets up impeller blade exit width COEFFICIENT Kb's
Mathematical Modeling, and multiple target hydraulic design optimization method is used for 2 points of its efficiency and nonblocking performance, to the number set up
Learn model to modify, be fitted KbOptimum formula.
9) uses double shrouded wheel structure, as specific speed nsWhen≤130, impeller blade import laying angle β115 °~26 ° are taken,
Impeller blade outlet laying angle β212 °~21 ° are taken, as specific speed nsDuring ＞ 130, impeller blade import laying angle β1Take 22 °~
34 °, impeller blade outlet laying angle β218 °~30 ° are taken, in design discharge, blade incidence Δ β uses high incidence, and Δ β takes 3 °
~5 °.
10) design of subtended angle of blades is derived from Mathematical Modeling aspect, and according to fluid mechanics knowledge and design experiences
Computing formula to cornerite is modified, when the high viscosity centrifugal pump for there is particular/special requirement can increase cornerite to meet design
It is required that.
11) is with the increase of pump specific angular speed, and number of blade z is intended to take smaller value, and entrance edge of blade is suitably to before suction inlet
Stretch.
Brief description of the drawings
Fig. 1 is the axis projection of the impeller of one embodiment of the invention
Fig. 2 is the blade wheel structure sketch of one embodiment of the invention
In figure：1. impeller inlet diameter D1, 2. impeller hub diameter dh, 3. vane inlet laying angle β1, 4. blade exits peace
Put angle beta2, 5. impeller outlet diameter D2, 6. blade exit width b2, 7. number of blade z, 8. subtended angle of blade φ.
Embodiment
The specific implementation process of the inventive method is provided below, it is 40mPas centrifugal pumps that design, which is applied to liquid viscosity,
Impeller step is as follows：
Impeller outlet diameter is according to required high viscosity centrifugal pump lift H, flow Q, rotating speed n, using formula (1), (2)
(3) determine:
D21=1.5D2 (3)
The outlet diameter that impeller inlet diameter is calculated according to corresponding specific speed and step 1, is determined using formula (4):
D1=0.04087ns 0.5353D21 (4)
Outlet edge of impeller blade width is determined by formula (5):
Impeller blade cornerite is according to import and export diameter D1、D2And specific speed, determined by formula (6):
Be present certain relation in impeller blade number and specific speed, determined by formula (7)：
Using double shrouded wheel structure, as specific speed nsWhen≤130, impeller blade import laying angle β1Take 15 °~26 °, impeller
Blade exit laying angle β212 °~21 ° are taken, as specific speed nsDuring ＞ 130, impeller blade import laying angle β1Take 22 °~34 °, leaf
Impeller blade outlet laying angle β218 °~30 ° are taken, in design discharge, blade incidence Δ β uses high incidence, and Δ β takes 3 °~5 °,
With the increase of pump specific angular speed, number of blade z is intended to take smaller value, and entrance edge of blade suitably protracts to suction inlet.
Under the same experiment condition of same pump case according to《GB3216-1989 centrifugal pumps, mixed-flow pump, axial-flow pump and peripheral pump
Experimental method》Defined experimental method obtains waterpower effect of the high viscosity centrifugal pump model of the inventive method under design conditions
Rate, than the high viscosity high 2%-5% of centrifugal pump hydraulic efficiency of traditional design method, and with good nonblocking performance.
Claims (7)
1. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller, described impeller includes front shroud (1), blade (2), bonnet
Plate (3), is typically characterized by, and according to design requirement lift H, flow Q, efficiency eta parameter designs the impeller outlet diameter of centrifugal pump
D2, impeller inlet diameter D1, impeller blade exit width b2, subtended angle of bladeNumber of blade z is determined by relationship below：
D21=(1.35~1.55) D2
D1=0.0409ns 0.5353·D21；
b21=(1.5~1.8) b2；
In formula：
D2- Ordinary Centrifugal Pumps impeller outlet diameter, mm；
D21- high viscosity centrifugal pump impeller outlet diameter, mm；
ns- chemical industry pump specific angular speed,
Kd- proportionality coefficient；
Q-pump discharge, m3/h；
N-revolution speed, r/min；
D1- impeller inlet diameter, mm；
b2- Ordinary Centrifugal Pumps blade exit width, mm；
b21- high viscosity centrifugal blade exit width, mm；
- impeller blade cornerite, °；
Z-impeller blade number.
2. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, its main applicable liquid
Dynamic viscosity scope is 0.1~100mPas, different specific speed range intervals fitting different proportion Relationship of Coefficients formulas, finally
The interval Proportional coefficient K of different specific speed is determined by theoretical and a large amount of outstanding Excellent Hydraulic Model Database of Centrifugal Pumpd。
3. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, it is characterised in that：According to leaf
Wheel outlet diameter determines the impeller inlet diameter of pump, is found by a large amount of outstanding Excellent Hydraulic Model Database of Centrifugal Pump of research, in a certain ratio
Impeller imports and exports the ratio of diameter under rotating speedThere is optimum interval, ratio ε optimal values and specific speed have exponential relationship ε
=0.04087ns 0.5353, by impeller outlet diameter can the more preferable determination pump of more system impeller inlet diameter.
4. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, it is characterised in that：Impeller leaf
Piece exit width andIt is directly proportional, according to substantial amounts of outstanding Excellent Hydraulic Model Database of Centrifugal Pump database, sets up impeller blade outlet wide
Spend COEFFICIENT KbMathematical Modeling, and use multiple target hydraulic design optimization method for 2 points of its efficiency and nonblocking performance, it is right
The Mathematical Modeling set up is modified, and is fitted KbOptimum formula.
5. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, it is characterised in that：Using closing
Formula blade wheel structure, as specific speed nsWhen≤130, impeller blade import laying angle β1Take 15 °~26 °, impeller blade outlet laying angle
β2Take 12 °~21°, as specific speed nsDuring ＞ 130, impeller blade import laying angle β122 °~34 ° are taken, impeller blade outlet is laid
Angle beta218 °~30 ° are taken, in design discharge, blade incidence Δ β uses high incidence, and Δ β takes 3 °~5 °.
6. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, it is characterised in that：Leaf packet
The design at angle is derived from Mathematical Modeling aspect, and the computing formula of cornerite is entered according to fluid mechanics knowledge and design experiences
Row modification, when for there is the centrifugal pump of particular/special requirement to increase cornerite to meet design requirement, and entrance edge of blade it is appropriate to
Suction inlet protracts.
7. a kind of Hydraulic Design Method of high viscosity centrifugal pump impeller according to claim 1, it is characterised in that：With pump
The increase of specific speed, number of blade z is intended to take smaller value.
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| KR102539721B1 (en) * | 2021-03-26 | 2023-06-05 | 주식회사 오알피이노베이션 | Centrifugal pump unit |
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| CN105298909A (en) * | 2015-10-16 | 2016-02-03 | 江苏大学 | Low-abrasion centrifugal slurry pump hydraulic design method |
| CN105221476A (en) * | 2015-10-16 | 2016-01-06 | 江苏大学 | A kind of off-design behaviour centrifugal pump Hydraulic Design Method |
| CN106837854B (en) * | 2015-12-04 | 2018-11-06 | 上海凯泉泵业（集团）有限公司 | A kind of low specific-speed centrifugal pump method for designing impeller |
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| CN107299912A (en) * | 2017-05-25 | 2017-10-27 | 江苏国泉泵业制造有限公司 | One kind spraying centrifugal multistage pump multiple centrifugal pump method for designing impeller |
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| CN110500314A (en) * | 2018-05-18 | 2019-11-26 | 郑州宇通客车股份有限公司 | A kind of impeller, centrifugal pump and vehicle |
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