CN106802974A - A kind of centrifugal blower volute Profile Design method - Google Patents
A kind of centrifugal blower volute Profile Design method Download PDFInfo
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Abstract
The present invention relates to a kind of centrifugal blower volute Profile Design method, including：Determine tri- control points of A, B, C；The coordinate for determining tri- control points of A, B, C in angle, θ on d coordinate systems is calculated, and three control points are depicted in the coordinate system of d in angle, θ, three control points are fitted to a full curve；It is the coordinate under polar coordinate system by 3 points of coordinate transformations in angle, θ on d coordinate systems of A, B, C；Draw the outer molded line of spiral case.Method for designing of the present invention is simple, and the outer molded line of the spiral case that the method is drawn out can control spiral case sectional area to be distributed, it is ensured that each area of section of spiral case increases according to specified rule；Meanwhile, can control centrifugal blower volute snail tongue position and snail tongue gap length by controlling A point coordinates；The diffusion effect of centrifugal blower volute can be effectively promoted, fan outlet total head is improved within the specific limits, reduce flow losses in spiral case, improve complete blower efficiency.
Description
Technical field
The present invention relates to centrifugal type fluid machine technical field, and in particular to a kind of centrifugal blower volute Profile Design side
Method.
Background technology
The effect of centrifugal blower volute includes at 2 points, first, the fluid flowed out from impeller is collected, second, will
Required potential energy is converted into from the kinetic energy of the high-velocity fluid of impeller outflow.Spiral case inlet pressure is the side for constraining the motion of spiral case internal flow
Boundary, it also determines the position of snail tongue and the size in snail tongue gap, has strong influence to the Performance of spiral case simultaneously.
The outer Profile Design of current most of spiral cases be based on waiting swirl distribution or uniform velocity distribution it is assumed that but in spiral case
There is great UNSTEADY FLOW in actual flowing, spiral case flow parameter skewness circumferentially at each section and spiral case inlet,
Hypothesis in its design process does not often meet actual conditions.Secondly, current spiral case inlet pressure method for designing lacks and spiral case is cut
Control that size is distributed in circumference method and snail tongue position and snail tongue gap length could not be determined.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of centrifugal blower volute Profile Design method, can control spiral case
External form wire shaped, determines the distribution in a circumferential direction of spiral case sectional area, realizes promoting spiral case diffusion effect, lifts volute outlet
Total head, improves complete blower efficiency.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of centrifugal blower volute Profile Design method, should
Method includes：
Step 1, determines tri- control points of A, B, C, wherein, A points are the starting point of spiral case inlet pressure, and B points are accumulated for controlling sections
The intermediate control point of distribution trend, C points are the terminating point of spiral case inlet pressure；
Step 2, the coordinate (θ, the d that determine tri- control points of A, B, C in angle, θ-on d coordinate systems are calculated by designing
(θ)), and in angle, θ-three control points are depicted in the coordinate system of d, intend using Bezier curve and by three control points
One full curve of synthesis, the curve can represent spiral case sectional area distribution situation, see Fig. 2, represent sectional area variation tendency；
Step 3, by A, B, C, 3 points are converted under polar coordinate system in angle, θ-coordinate (θ, d (θ)) on d coordinate systems
Coordinate (θ, R (θ))；
Step 4, draws the outer molded line of spiral case.
Further, in the step 1, A points are located at angle, θ-on d coordinate systems, and its abscissa θ a represent snail tongue position,
Ordinate da represents snail tongue gap.
In the step 1, C point abscissas θcIt is 360 °, C point ordinates dcIt is the height H at fan outlet.
Further, in the step 2, it is contemplated that it is constantly increase along the circumferential direction to go up apart from d, no
It differs greatly apart from the span of d under common-azimuth θ, therefore introduces a design variable t, leads to
Variable t is crossed to calculate db。dbComputational methods be：
1) sectional area is calculated linearly to pass in angle, θ-coordinate under d coordinate systems by A, C point
Growth rate during increasingAnd intercept b=dc-kθc；
2) it is θ at azimuth when calculating sectional area with linear increase by growth rate k and intercept b againbPlace apart from d1；
3) finally by variable t is introduced, d is calculatedb=d1+t。
Design calculates the coordinate that can obtain A, B, C at 3 points in angle, θ-under d coordinate systems more than.
Further, in the step 3,3 points of ordinates under polar coordinate system of A, B, C are respectively it in angle, θ-apart from d
Ordinate value under coordinate system adds the radius of impeller.
The coordinate of 3 points of A, B, C is respectively P under polar coordinate systemA(θa, Ra)、PB(θb, Rb)、PC(θc, Rc), wherein Ra=da
+0.5D2；Rb=db+0.5D2；Rc=dc+0.5D2, wherein D2It is impeller diameter.
Further, the step 4 is specifically, according to PA、PB、PCThree point coordinates, using three-dimensional graphics software, by setting up
Bezier curve equation draws the outer molded line of spiral case.
The Bezier curve equation is as follows:
B (T)=(1-T)2PA+2T(1-T)PB+T2PC, T ∈ [0,1]
When t is to bear, sectional area change curve is to recessed, the fast trend for increasing after the aobvious first slow increasing of sectional area change；Work as t
It is timing, sectional area change curve is convex, and the slow trend for increasing after the aobvious first fast increasing of sectional area change, flex point is B points；When
When t is 0, sectional area linear increment.
Further, the three-dimensional graphics software is CREO2.0 softwares.
Based on above-mentioned technical proposal, the beneficial effects of the invention are as follows：Method for designing of the present invention is simple, what the method was drawn out
The outer molded line of spiral case can control spiral case sectional area to be distributed, it is ensured that each area of section of spiral case increases according to specified rule.Meanwhile, by control
A point coordinates processed can control centrifugal blower volute snail tongue position and snail tongue gap length.Centrifugal blower volute can be effectively promoted
Diffusion effect, within the specific limits improve fan outlet total head, reduce spiral case in flow losses, improve complete blower efficiency.
Brief description of the drawings
Fig. 1 is spiral case external form line geometry parameter schematic diagram；
Fig. 2 be on the outer molded line of spiral case each point in angle, θ-apart from the schematic diagram of d coordinate systems；
Fig. 3 is the contrast of the blower fan using spiral case of the present invention and the blower fan using prototype spiral case in total head performance；
Fig. 4 is the contrast of the blower fan using spiral case of the present invention and the blower fan using prototype spiral case in efficiency performance.
Specific embodiment
Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
According to one embodiment of present invention, the outer molded line of the spiral case of antecurvature formula centrifugal blower is drawn by equilateral based method
Form, impeller diameter D2=400mm.
The starting point of the outer molded line of spiral case is snail tongue position, and terminating point is volute outlet opening width position.Divulged information for centrifugation
For machine spiral case, its cross sectional shape is rectangle, and Casing width K is constant, impeller outlet to outer molded line diametrically apart from d with
Sectional area S (S=d*K) size is directly proportional at the radial direction.Therefore, angle, θ-go out spiral case along circle apart from d image energy pictutes
The distribution of its area of section in circumferential direction.
C points, therefore C point transverse and longitudinal marks θ are secured in order to ensure spiral case overall dimensions, in designc=360 °, C point ordinates dc
=H=120mm.
Depending on the selection of A point coordinates is needed according to different blower fan classifications, with regard to the present embodiment in antecurvature formula centrifugal blower, choosing
A point coordinates is taken for (30.125 °, 17.8mm).
With reference to Fig. 1 and Fig. 2, it is known that B point coordinates can be calculated after the point coordinates of A, C two；
Growth rate when calculating sectional area with linear incrementAnd intercept b=dc-kθc=
8.472。
It is θ at azimuth when calculating sectional area with linear increase by growth rate k and intercept b againbAt=201.5 °
Apart from d1=k* θb+ b=70.8967.
Finally by variable t is introduced, t=-17.5 is taken here, calculate db=d1+ t=53.3967, obtain B points angle, θ-
Coordinate (201.5 °, 53.3967mm) under d coordinate systems；
By A, B, C, 3 points is the coordinate under polar coordinate system in angle, θ-Coordinate Conversion under d coordinate systems；
Ra=da+0.5D2=217.8mm, Rb=db+0.5D2=253.3967mm, Rc=dc+0.5D2=320m m, obtain
Coordinate Ps of 3 points of A, B, the C under polar coordinate systemA(30.125 °, 217.8mm), PB(201.5 °, 253.3967mm), PC
(360 °, 320mm).
With CREO2.0 softwares, double-click " curve from equation ", elect coordinate system as cylindrical coordinates, click on " equation ", it is defeated
Enter by PA(θa, Ra)、PB(θb, Rb)、PC(θc, Rc) 3 points of compositions Bezier curve equation, click on and determine to complete to draw.
The outer molded line of spiral case that the method is drawn out can control spiral case sectional area to be distributed, it is ensured that each area of section of spiral case is according to finger
Set pattern rule increases.Meanwhile, can control centrifugal blower volute snail tongue position and snail tongue gap length by controlling A point coordinates.Energy
The diffusion effect of centrifugal blower volute is effectively promoted, fan outlet total head is improved, reduces flow losses in spiral case, lifting is certain
Efficiency.
Calculated by actual CFD, compared for the spiral case and prototype spiral case of the method design, Fig. 3, Fig. 4 are performance comparison figure.
In the embodiment of the present invention, design parameter θa, da, θb, the value of t is carried out in the case where certain design experiences are possessed, right
In different classes of, the blower fan of different size size, the selection of its value has differences.The present embodiment is preferred, θaValue be 30 °~
60 °, daValue is 0.03~0.1D2, θbValue is 160 °~240 °, and t values are -0.1D2~+0.05D2。
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of centrifugal blower volute Profile Design method, it is characterised in that including：
Step 1, determines tri- control points of A, B, C, wherein, A points are the starting point of spiral case inlet pressure, and B points are intermediate control point, C points
It is the terminating point of spiral case inlet pressure；
Step 2, calculates the coordinate for determining tri- control points of A, B, C in angle, θ-on d coordinate systems, and in angle, θ-apart from d
Coordinate system in depict three control points, three control points are fitted to a full curve；
Step 3, by the coordinate of 3 points of A, B, C in the case where the coordinate transformation of angle, θ-on d coordinate systems is for polar coordinate system；
Step 4, draws the outer molded line of spiral case.
2. a kind of centrifugal blower volute Profile Design method according to claim 1, it is characterised in that in the step 1,
A points are located at angle, θ-on d coordinate systems, and its abscissa θ a represent snail tongue position, and ordinate da represents snail tongue gap.
3. a kind of centrifugal blower volute Profile Design method according to claim 1, it is characterised in that in the step 1,
C point abscissas θcIt is 360 °, C point ordinates dcIt is the height at fan outlet.
4. a kind of centrifugal blower volute Profile Design method according to claim 1, it is characterised in that in the step 2,
dbComputational methods be：
1) growth rate by A, C point when angle, θ-coordinate under d coordinate systems calculates sectional area with linear incrementAnd intercept b=dc-kθc；
2) it is θ at azimuth when calculating sectional area with linear increase by growth rate k and intercept bbPlace apart from d1；
3) variable t is introduced, d is calculatedb=d1+t。
5. a kind of centrifugal blower volute Profile Design method according to claim 1, it is characterised in that in the step 3,
3 points of ordinates under polar coordinate system of A, B, C are respectively it and add impeller in angle, θ-ordinate value under d coordinate systems
Radius.
6. a kind of centrifugal blower volute Profile Design method according to claim 5, it is characterised in that in the step 3,
The coordinate of 3 points of A, B, C is respectively P under polar coordinate systemA(θa, Ra)、PB(θb, Rb)、PC(θc, Rc), wherein Ra=da+0.5D2,
Rb=db+0.5D2,Rc=dc+0.5D2, wherein D2It is impeller diameter.
7. a kind of centrifugal blower volute Profile Design method according to claim 1, it is characterised in that the step 4 has
Body is, according to PA、PB、PCThree point coordinates, using three-dimensional graphics software, are drawn outside spiral case by setting up Bezier curve equation
Molded line.
8. a kind of centrifugal blower volute Profile Design method according to claim 7, it is characterised in that the Bezier is bent
Line equation is as follows:
B (T)=(1-T)2PA+2T(1-T)PB+T2PC, T ∈ [0,1]
When t is to bear, sectional area change curve is to recessed, the fast trend for increasing after the aobvious first slow increasing of sectional area change；When t is for just
When, sectional area change curve is convex, and the slow trend for increasing after the aobvious first fast increasing of sectional area change, flex point is B points；When t is 0
When, sectional area linear increment.
9. a kind of centrifugal blower volute Profile Design method according to claim 7, it is characterised in that the three-dimensional drawing
Software is CREO2.0 softwares.
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| CN201611052545.2A CN106802974A (en) | 2016-11-25 | 2016-11-25 | A kind of centrifugal blower volute Profile Design method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108256185A (en) * | 2018-01-03 | 2018-07-06 | 西安交通大学 | A kind of radial velocity component methods of exhibiting for multi-wing centrifugal fan impeller inlet face |
| CN108374792A (en) * | 2018-01-12 | 2018-08-07 | 清华大学 | A kind of centrifugal compressor using spiral casing flow passage section A/r nonlinear Distributions |
| CN109008663A (en) * | 2018-08-14 | 2018-12-18 | 佛山市顺德区酷福电器有限公司 | A kind of air ovens |
| CN109871595A (en) * | 2019-01-28 | 2019-06-11 | 天津大学 | A kind of design method of spiral case |
| CN110516326A (en) * | 2019-08-13 | 2019-11-29 | 浙江万事兴电器有限公司 | A kind of energy noise reduction promotes the kitchen ventilator Volute Design method of air quantity |
| CN110750855A (en) * | 2019-09-06 | 2020-02-04 | 华中科技大学 | Volute molded line design method under shape sizing limitation |
| CN111102246A (en) * | 2020-01-07 | 2020-05-05 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111460585A (en) * | 2020-03-06 | 2020-07-28 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN114352575A (en) * | 2022-01-05 | 2022-04-15 | 广东携创电机有限公司 | Volute structure of multi-wing centrifugal fan and molded line modification method thereof |
| CN114876830A (en) * | 2022-04-26 | 2022-08-09 | 杭州老板电器股份有限公司 | Volute, fan and range hood |
| CN116992601A (en) * | 2023-09-27 | 2023-11-03 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
| CN117634094A (en) * | 2023-12-12 | 2024-03-01 | 广东宏伙控股集团有限公司 | Supercharging volute and design method thereof |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108256185A (en) * | 2018-01-03 | 2018-07-06 | 西安交通大学 | A kind of radial velocity component methods of exhibiting for multi-wing centrifugal fan impeller inlet face |
| CN108374792A (en) * | 2018-01-12 | 2018-08-07 | 清华大学 | A kind of centrifugal compressor using spiral casing flow passage section A/r nonlinear Distributions |
| CN109008663A (en) * | 2018-08-14 | 2018-12-18 | 佛山市顺德区酷福电器有限公司 | A kind of air ovens |
| CN109008663B (en) * | 2018-08-14 | 2024-01-09 | 佛山市顺德区酷福电器有限公司 | Air oven |
| CN109871595A (en) * | 2019-01-28 | 2019-06-11 | 天津大学 | A kind of design method of spiral case |
| CN109871595B (en) * | 2019-01-28 | 2023-02-28 | 天津大学 | Design method of volute |
| CN110516326A (en) * | 2019-08-13 | 2019-11-29 | 浙江万事兴电器有限公司 | A kind of energy noise reduction promotes the kitchen ventilator Volute Design method of air quantity |
| CN110516326B (en) * | 2019-08-13 | 2023-05-23 | 浙江万事兴电器有限公司 | Design method of fume exhaust fan volute capable of reducing noise and improving air quantity |
| CN110750855A (en) * | 2019-09-06 | 2020-02-04 | 华中科技大学 | Volute molded line design method under shape sizing limitation |
| CN111102246A (en) * | 2020-01-07 | 2020-05-05 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111102246B (en) * | 2020-01-07 | 2022-02-08 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111460585A (en) * | 2020-03-06 | 2020-07-28 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111460585B (en) * | 2020-03-06 | 2023-08-18 | 宁波方太厨具有限公司 | Volute molded line generation method of centrifugal fan |
| CN114352575A (en) * | 2022-01-05 | 2022-04-15 | 广东携创电机有限公司 | Volute structure of multi-wing centrifugal fan and molded line modification method thereof |
| CN114352575B (en) * | 2022-01-05 | 2023-08-25 | 广东携创电机有限公司 | Multi-wing centrifugal fan volute structure and molded line modification method thereof |
| CN114876830A (en) * | 2022-04-26 | 2022-08-09 | 杭州老板电器股份有限公司 | Volute, fan and range hood |
| CN114876830B (en) * | 2022-04-26 | 2024-05-10 | 杭州老板电器股份有限公司 | Spiral case, fan and lampblack absorber |
| CN116992601B (en) * | 2023-09-27 | 2023-12-26 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
| CN116992601A (en) * | 2023-09-27 | 2023-11-03 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
| CN117634094A (en) * | 2023-12-12 | 2024-03-01 | 广东宏伙控股集团有限公司 | Supercharging volute and design method thereof |
| CN117634094B (en) * | 2023-12-12 | 2024-06-04 | 广东宏伙控股集团有限公司 | Supercharging volute and design method thereof |
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Application publication date: 20170606 |