CN117634094B - Supercharging volute and design method thereof - Google Patents
Supercharging volute and design method thereof Download PDFInfo
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- CN117634094B CN117634094B CN202311711221.5A CN202311711221A CN117634094B CN 117634094 B CN117634094 B CN 117634094B CN 202311711221 A CN202311711221 A CN 202311711221A CN 117634094 B CN117634094 B CN 117634094B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000009792 diffusion process Methods 0.000 claims abstract description 23
- 238000012163 sequencing technique Methods 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/20—Design reuse, reusability analysis or reusability optimisation
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- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of volutes, in particular to a pressurizing volute and a design method thereof, wherein the method comprises the steps of establishing a three-dimensional coordinate system x-y-z according to the rotation shaft of a wind wheel and the airflow inlet direction of the volute; the volute molded line II, the volute tongue inner molded line III and the volute tongue outer molded line IV are respectively controlled by a multipoint control method; setting a diffusion coefficient Y according to the circle center O' of the wind wheel and the diameter D of the wind wheel, and sequentially limiting all control points of all volute molded lines II, volute tongue inner lines III and volute tongue outer lines IV; cutting off a plurality of volute airflow cross sections and volute tongue airflow cross sections, projecting all the volute airflow cross sections and the volute tongue airflow cross sections on a coordinate system x-z, adjusting all upper vertexes to meet a first preset condition and all lower vertexes to meet a second preset condition, and adjusting line parameters among control points on the plurality of cross sections to obtain a quasi-circular curve; and sequentially stretching all the circular-like curves subjected to sequencing to form a wind wheel airflow circulation channel, and combining with a volute tongue inner line III to complete the design of the supercharging volute.
Description
Technical Field
The invention relates to the technical field of centrifugal fan volutes, in particular to a supercharging volute and a design method thereof.
Background
It is well known that the casing of a centrifugal fan consists of parts such as a volute, an air inlet, a fan volute tongue and the like. The volute of the centrifugal fan is formed by welding or biting left and right side plates of the housing through the volute plate, and the volute is used for collecting and guiding medium gas conveyed from the impeller of the centrifugal fan so as to enable the gas to be converged to an air outlet of the volute of the fan. The sections of the air outlets of the conventional centrifugal fans are rectangular, so that the air outlet efficiency is low; most of the outlets are horizontal air outlet without bending, and the static pressure is not high enough.
The profile of the centrifugal fan volute is known as an archimedes spiral, the calculation of which is very important. It can have a great impact on the performance and efficiency of the centrifugal fan. If the design of the volute line is too large, wind pressure loss can be caused, and if the design of the volute line is too small, the medium flow of the centrifugal fan can be influenced. In addition, the design of the volute molded line always adopts a four-point or six-point method, so that the method is relatively backward, wide in range and weak in adaptability.
The volute tongue of the centrifugal fan volute is also important. Although it is a non-eye-forming curve, it is an important component of the centrifugal fan housing. The design of the centrifugal fan volute tongue directly influences the noise level and the pneumatic efficiency of the centrifugal fan and is a very important component in fan design and manufacture. The unreasonable design of the volute tongue will form a large amount of vortex at the volute tongue and the air outlet, causing efficiency drop and huge noise, and conversely, the noise of the fan will be significantly reduced.
Disclosure of Invention
One purpose of the invention is to provide a design method of a boost volute, which is a volute molded line drawing method in a better range, and can effectively reduce ineffective drawing of the boost volute molded line; meanwhile, the designed supercharging volute can increase the static pressure energy of air flow, and the air outlet efficiency is higher.
Another objective of the present invention is to provide a booster volute manufactured by the aforementioned booster volute design method.
To achieve the purpose, the invention adopts the following technical scheme:
a method of designing a booster volute, comprising the steps of:
S1, determining a z-axis direction and an axis O according to the direction of a rotating shaft of a wind wheel and an airflow inlet of a volute, respectively defining an x-axis direction and a y-axis direction along two directions perpendicular to the z-axis and mutually perpendicular to each other, and establishing a three-dimensional coordinate system x-y-z;
S2, carrying out horizontal section on a coordinate system x-y through an axle center O to obtain a wind wheel molded line I of a wind wheel, a volute molded line II of a volute, a volute tongue inner molded line III of a volute tongue and a volute tongue outer molded line IV, and respectively controlling the volute molded line II, the volute tongue inner molded line III and the volute tongue outer molded line IV by a multipoint control method;
S3, setting a diffusion coefficient Y according to the circle center O' of the wind wheel and the diameter D of the wind wheel, and sequentially limiting the distance and the angle relation between all control points of the volute tongue outer line IV;
s4, sequentially limiting the distance and the angle relation among all volute tongue position design points according to the limited volute position design points;
S5, defining the distance and angle relation between all control points on a volute tongue inner profile III in sequence according to the diameter D of the wind wheel and the defined volute tongue position design point;
S6, screening a plurality of volute position design points from all control points on a volute molded line II, and cutting off a plurality of volute airflow flow cross sections along a direction parallel to a z axis by connecting lines between the volute position design points and a wind wheel circle center O'; screening a plurality of volute tongue position design points from all control points on a volute tongue appearance line IV, and cutting a plurality of volute tongue airflow flow cross sections along the direction parallel to the x axis after passing through the volute tongue position design points;
s7, all the volute airflow flow cross sections are projected on a coordinate system x-z according to the corresponding volute position design points and the volute tongue airflow flow cross sections are projected on the coordinate system x-z according to the corresponding volute tongue position design points so as to determine upper vertexes and lower vertexes of the volute airflow flow cross sections and the volute tongue airflow flow cross sections; wherein the upper vertex is the vertex closest to the wind wheel airflow inlet, and the lower vertex is the vertex farthest from the wind wheel airflow inlet;
S8, adjusting line parameters among a plurality of volute airflow cross sections and control points on the volute tongue airflow cross sections by a multipoint control method after all upper vertexes meet a first preset condition and all lower vertexes meet a second preset condition, so as to obtain a quasi-circular curve;
S9, sequencing all the quasi-circular curves along the airflow outlet direction of the volute, calculating the areas of all the quasi-circular curves, comparing the areas of all the quasi-circular curves in pairs according to sequencing to obtain a plurality of comparison results, judging whether the comparison results meet the judgment conditions, outputting all the quasi-circular curves with the sequencing completed if the comparison results meet the judgment conditions, and repeating S8 if the comparison results do not meet the judgment conditions;
And S10, sequentially stretching all the circular-like curves subjected to sequencing to form a wind wheel airflow circulation channel, and combining with a volute tongue inner line III to complete the design of the supercharging volute.
Preferably, in S8, if the number of the upper vertices is 10;
Let the absolute values of z values of 10 upper vertices on the coordinate system x-z be z 1 (upper), z 2 (upper), z 3 (upper), z 4 (upper), z 5 (upper), z 6 (upper), z 7 (upper), z 8 (upper), z 9 (upper), and z 10 (upper), the first preset condition being z 1 (upper) =z 2 (upper) =z 3 (upper) =z 4 (upper) =z 5 (upper) =z 6 (upper) =z 7 (upper) =z 8 (upper) =z 9 (upper) =z 10 (upper);
If the number of the lower vertexes is 10;
Let the absolute values of z values of 10 lower vertices on coordinate system x-z be z 1 (lower), z 2 (lower), z 3 (lower), z 4 (lower), z 5 (lower), z 6 (lower), z 7 (lower), z 8 (lower), z 9 (lower), and z 10 (lower), the second preset condition be z 1 (lower) =z 2 (lower) =z 3 (lower) =z 4 (lower) =z 5 (lower) < z 6 (lower) < z 7 (lower) < z 8 (lower) < z 9 (lower) < z 10 (lower).
Preferably, in S8, the quasi-circular curve includes 8 control points and a center point 0", where the 8 control points are P (0), P (1), P (2), P (3), P (4), P (5), P (6) and P (7), and the quasi-circular curve is composed of a straight line segment P (0) P (7), an arc line segment P (0) P (1), a straight line segment P (1) P (2), an arc line segment P (2) P (3), a straight line segment P (3) P (4), an arc line segment P (4) P (5), a straight line segment P (5) P (6) and an arc line segment P (6) P (7);
The chamfering device comprises a chamfering device, a chamfering device and a chamfering device, wherein the chamfering device comprises an arc line section P (0) P (1) is R1, the chamfering device comprises an arc line section P (2) P (3) is R2, the chamfering device comprises an arc line section P (4) P (5) is R3, the chamfering device comprises an arc line section P (6) P (7) is R4, the length of a straight line section P (0) P (7) is H1, the length of a straight line section P (3) P (4) is H2, the length of a straight line section P (1) P (2) is L1, the length of a straight line section P (5) P (6) is L, the length of a wind wheel in the radial direction is L, and the length of a wind wheel in the height direction is H;
And satisfies the following relationship: r1=r2=r3=r4+_h1=h2; r1=r2=r3=r4+.l1=l2; l=2×r1+l1, h=2×r1+h1.
Preferably, in S9, if the number of all the upper vertices and the lower vertices is 10, the number of the quasi-circular curves is 10, and the areas of the 10 quasi-circular curves are A1, A2, A3, A4, A5, A6, A7, A8, A9 and a10 according to the sorting order, and the judgment condition is that A1 < A2 < A3 < A4 < A5 < A6 < A7 < A8 < A9 < a10.
Preferably, in S3, according to the circle center O' of the wind wheel and the diameter D of the wind wheel, a diffusion coefficient Y is set, and the distance and the angle relation between all control points of the volute tongue outer line IV are sequentially limited; the method specifically comprises the following steps:
S311, establishing a polar coordinate system r-theta according to the distances and angles between all control points of the volute outer line and the circle center O' of the wind wheel; the starting point of the volute molded line II and the wind wheel molded line I are intersected at a control point P0, the ending point of the volute molded line II and the starting point of the volute tongue outer molded line IV are connected to a control point Pk, and the ending point of the volute tongue outer molded line IV is Pn and is more than 0 and less than n; the number of all control points of the volute type line II is k, and P0, P1 … …, pt, … … and P (k) are set; t is more than or equal to 1 and less than or equal to k;
S312, setting a diffusion coefficient Y in a polar coordinate system r-theta, wherein the coordinates of all control points on a volute molded line II are defined as (rt, thetat), Y is more than or equal to 0.2 and less than or equal to 0.5, (r 0, theta0) = (-D/2, 0), pt=1/k+Pt-1, rt= ±0.5+Pt x Y x D, wherein +/-depends on the quadrant where the thetat angle value is located in a two-dimensional plane coordinate system, the 1 st quadrant and the 2 nd quadrant are +, the 3 rd quadrant and the 4 th quadrant are (-0, thetat= -Pt x 360 degrees).
Preferably, in S4, distances and angular relationships between all volute tongue position design points are sequentially defined according to the defined volute position design points; the method specifically comprises the following steps:
The connection line between the starting point Pk of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PkO', the connection line between the ending point Pn of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PnO', and an included angle beta formed by the straight line segment PkO 'and the straight line segment PnO' is more than or equal to 3 degrees and less than or equal to 20 degrees.
Preferably, in S6, a plurality of design points of the volute position are selected from all control points on the volute line II, which specifically includes:
If the number of the volute position design points is 8, the 8 volute position design points are respectively P1, P2, P3, P4, P5, P6, P7 and P8, wherein the included angle between each two adjacent points P1-P8 and the connecting line of the circle center O' of the wind wheel is alpha, and the alpha is 45 degrees.
Preferably, in S6, a plurality of design points for the volute tongue position are selected from all control points on the volute tongue outer line IV; the method specifically comprises the following steps:
If the number of the volute tongue position design points is 2, the 2 volute tongue position design points are respectively P9 and P10, a connecting line between the volute tongue position design points P9 and P10 is a straight line segment P9P10, and a connecting line between the volute tongue position design points P7 and P8 is an arc line segment P7P8, wherein the straight line segment P9P10 is tangent to the arc line segment P7P 8.
Preferably, in S5, according to the diameter D of the wind wheel and the defined design points of the volute tongue position, the distance and the angular relationship between all the control points on the internal volute tongue line III are defined in sequence; the method specifically comprises the following steps:
the volute tongue inner line III comprises a volute tongue radius III-1 and a diffusion line III-2, the volute tongue radius/wind wheel diameter D is smaller than or equal to 0.03 and smaller than or equal to 0.06, and the included angle between the diffusion line and the straight line segment P9P10 is smaller than or equal to 20 degrees.
The pressurizing volute is manufactured by adopting the pressurizing volute design method.
One of the above technical solutions has the following beneficial effects: compared with the traditional rectangle with lower air outlet efficiency, the invention designs the airflow cross section of the volute and the airflow cross section of the volute tongue as similar circular curves, and the line parameters of the airflow cross section and the airflow cross section of the volute tongue are properly adjusted, wherein the line parameters comprise the upper vertexes, the lower vertexes and the areas of a plurality of similar circular curves, so that the turbulence energy loss of the similar circular volute cross section at the corners of the volute is reduced, and in order to improve the efficiency of airflow in the diffusion process, all similar circular curves are sequenced along the airflow outlet direction of the volute, and then are sequentially stretched to form a wind wheel airflow circulation channel, and the design of the booster volute is completed by combining the internal volute tongue line III.
Drawings
FIG. 1 is a flow chart of a method of designing a booster volute according to the present invention;
FIG. 2 is a horizontal cross-sectional view of the present invention in a pressurized volute;
FIG. 3 is a schematic illustration of the location of the present invention in a volute line of a pressurized volute;
FIG. 4 is a schematic illustration of the location of the present invention at a volute location design point and a volute tongue location design point of a pressurized volute;
FIG. 5 is a control schematic of the present invention in a boost volute of a quasi-circular curve;
FIG. 6 is a schematic view of the present invention in projection of the volute airflow cross-section and volute tongue airflow cross-section of a pressurized volute on a coordinate system x-z;
FIG. 7 is a schematic top view of a booster volute of the present invention using a booster volute design method;
FIG. 8 is a schematic view of a pressurized volute of the present invention using a pressurized volute design method;
in the accompanying drawings: the wind wheel profile I, the volute casing profile II, the volute tongue inner profile III and the volute tongue outer profile IV of the volute tongue, the volute tongue radius III-1 and the diffusion line III-2.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1-6, a method for designing a booster volute includes the steps of:
S1, determining a z-axis direction and an axis O according to the direction of a rotating shaft of a wind wheel and an airflow inlet of a volute, respectively defining an x-axis direction and a y-axis direction along two directions perpendicular to the z-axis and mutually perpendicular to each other, and establishing a three-dimensional coordinate system x-y-z;
S2, carrying out horizontal section on a coordinate system x-y through an axle center O to obtain a wind wheel molded line I of a wind wheel, a volute molded line II of a volute, a volute tongue inner molded line III of a volute tongue and a volute tongue outer molded line IV, and respectively controlling the volute molded line II, the volute tongue inner molded line III and the volute tongue outer molded line IV by a multipoint control method;
S3, setting a diffusion coefficient Y according to the circle center O' of the wind wheel and the diameter D of the wind wheel, and sequentially limiting the distance and the angle relation between all control points of the volute tongue outer line IV;
s4, sequentially limiting the distance and the angle relation among all volute tongue position design points according to the limited volute position design points;
S5, defining the distance and angle relation between all control points on a volute tongue inner profile III in sequence according to the diameter D of the wind wheel and the defined volute tongue position design point;
S6, screening a plurality of volute position design points from all control points on a volute molded line II, and cutting off a plurality of volute airflow flow cross sections along a direction parallel to a z axis by connecting lines between the volute position design points and a wind wheel circle center O'; screening a plurality of volute tongue position design points from all control points on a volute tongue appearance line IV, and cutting a plurality of volute tongue airflow flow cross sections along the direction parallel to the x axis after passing through the volute tongue position design points;
s7, all the volute airflow flow cross sections are projected on a coordinate system x-z according to the corresponding volute position design points and the volute tongue airflow flow cross sections are projected on the coordinate system x-z according to the corresponding volute tongue position design points so as to determine upper vertexes and lower vertexes of the volute airflow flow cross sections and the volute tongue airflow flow cross sections; wherein the upper vertex is the vertex closest to the wind wheel airflow inlet, and the lower vertex is the vertex farthest from the wind wheel airflow inlet;
S8, adjusting line parameters among a plurality of volute airflow cross sections and control points on the volute tongue airflow cross sections by a multipoint control method after all upper vertexes meet a first preset condition and all lower vertexes meet a second preset condition, so as to obtain a quasi-circular curve;
S9, sequencing all the quasi-circular curves along the airflow outlet direction of the volute, calculating the areas of all the quasi-circular curves, comparing the areas of all the quasi-circular curves in pairs according to sequencing to obtain a plurality of comparison results, judging whether the comparison results meet the judgment conditions, outputting all the quasi-circular curves with the sequencing completed if the comparison results meet the judgment conditions, and repeating S8 if the comparison results do not meet the judgment conditions;
And S10, sequentially stretching all the circular-like curves subjected to sequencing to form a wind wheel airflow circulation channel, and combining with a volute tongue inner line III to complete the design of the supercharging volute.
Compared with the traditional rectangle with lower air outlet efficiency, the invention designs the airflow cross section of the volute and the airflow cross section of the volute tongue as similar circular curves, and the line parameters of the airflow cross section and the airflow cross section of the volute tongue are properly adjusted, wherein the line parameters comprise the upper vertexes, the lower vertexes and the areas of a plurality of similar circular curves, so that the turbulence energy loss of the similar circular volute cross section at the corners of the volute is reduced, and in order to improve the efficiency of airflow in the diffusion process, all similar circular curves are sequenced along the airflow outlet direction of the volute, and then are sequentially stretched to form a wind wheel airflow circulation channel, and the design of the booster volute is completed by combining the internal volute tongue line III.
In conclusion, the invention relates to a design method of a supercharging volute, and is a drawing method of a volute molded line II in a better range, so that invalid drawing of the supercharging volute molded line II can be effectively reduced; meanwhile, the designed supercharging volute can increase the static pressure energy of air flow, and the air outlet efficiency is higher.
Further describing, in S8, if the number of upper vertices is 10;
Let the absolute values of z values of 10 upper vertices on the coordinate system x-z be z 1 (upper), z 2 (upper), z 3 (upper), z 4 (upper), z 5 (upper), z 6 (upper), z 7 (upper), z 8 (upper), z 9 (upper), and z 10 (upper), the first preset condition being z 1 (upper) =z 2 (upper) =z 3 (upper) =z 4 (upper) =z 5 (upper) =z 6 (upper) =z 7 (upper) =z 8 (upper) =z 9 (upper) =z 10 (upper);
If the number of the lower vertexes is 10;
Let the absolute values of z values of 10 lower vertices on coordinate system x-z be z 1 (lower), z 2 (lower), z 3 (lower), z 4 (lower), z 5 (lower), z 6 (lower), z 7 (lower), z 8 (lower), z 9 (lower), and z 10 (lower), the second preset condition be z 1 (lower) =z 2 (lower) =z 3 (lower) =z 4 (lower) =z 5 (lower) < z 6 (lower) < z 7 (lower) < z 8 (lower) < z 9 (lower) < z 10 (lower).
In order to improve the air outlet efficiency of the air flow at the wind wheel outlet, the volute outlet can be deflected along the air inlet direction, and as in the embodiment, when all the upper vertexes meet the first preset condition and all the lower vertexes meet the second preset condition, the volute outlet is downward along the air inlet direction, so that the static pressure energy of the air flow can be increased, and the air outlet efficiency is higher than that of the conventional air outlet and horizontal air outlet.
Further describing, in S8, the quasi-circular curve includes 8 control points and a center point 0", where the 8 control points are P (0), P (1), P (2), P (3), P (4), P (5), P (6) and P (7), and the quasi-circular curve is composed of straight line segment P (0) P (7), arc line segment P (0) P (1), straight line segment P (1) P (2), arc line segment P (2) P (3), straight line segment P (3) P (4), arc line segment P (4) P (5), straight line segment P (5) P (6) and arc line segment P (6) P (7);
The chamfering device comprises a chamfering device, a chamfering device and a chamfering device, wherein the chamfering device comprises an arc line section P (0) P (1) is R1, the chamfering device comprises an arc line section P (2) P (3) is R2, the chamfering device comprises an arc line section P (4) P (5) is R3, the chamfering device comprises an arc line section P (6) P (7) is R4, the length of a straight line section P (0) P (7) is H1, the length of a straight line section P (3) P (4) is H2, the length of a straight line section P (1) P (2) is L1, the length of a straight line section P (5) P (6) is L, the length of a wind wheel in the radial direction is L, and the length of a wind wheel in the height direction is H;
And satisfies the following relationship: r1=r2=r3=r4+_h1=h2; r1=r2=r3=r4+.l1=l2; l=2×r1+l1, h=2×r1+h1.
In theory, when the airflow cross section of the volute and the airflow cross section of the volute tongue are circular, the air outlet efficiency is highest, but if the cross section is circular, the wind wheel diameter can limit the height of the wind wheel when reaching a certain value, so in actual engineering, the design of the similar circular airflow cross section can not only meet the requirement of adjusting the height of the wind wheel according to the application size of the actual engineering, but also furthest improve the flow efficiency.
Further, in S9, if the number of all the upper vertices and the lower vertices is 10, the number of the quasi-circular curves is 10, and the areas of the 10 quasi-circular curves are A1, A2, A3, A4, A5, A6, A7, A8, A9 and a10 according to the order, and the judgment condition is A1 < A2 < A3 < A4 < A5 < A6 < A7 < A8 < A9 < a10. In this judgment condition, 10 cross-sectional areas gradually increase, and a diffusion tendency can be formed.
Further describing, in S3, according to the center O' of the wind wheel and the diameter D of the wind wheel, a diffusion coefficient Y is set to sequentially define the distance and angle relation between all the control points of the outer volute tongue line IV; the method specifically comprises the following steps:
S311, establishing a polar coordinate system r-theta according to the distances and angles between all control points of the volute outer line and the circle center O' of the wind wheel; the starting point of the volute molded line II and the wind wheel molded line I are intersected at a control point P0, the ending point of the volute molded line II and the starting point of the volute tongue outer molded line IV are connected to a control point Pk, and the ending point of the volute tongue outer molded line IV is Pn and is more than 0 and less than n; the number of all control points of the volute type line II is k, and P0, P1 … …, pt, … … and P (k) are set; t is more than or equal to 1 and less than or equal to k;
S312, setting a diffusion coefficient Y in a polar coordinate system r-theta, wherein the coordinates of all control points on a volute molded line II are defined as (rt, thetat), Y is more than or equal to 0.2 and less than or equal to 0.5, (r 0, theta0) = (-D/2, 0), pt=1/k+Pt-1, rt= ±0.5+Pt x Y x D, wherein +/-depends on the quadrant where the thetat angle value is located in a two-dimensional plane coordinate system, the 1 st quadrant and the 2 nd quadrant are +, the 3 rd quadrant and the 4 th quadrant are (-0, thetat= -Pt x 360 degrees).
The spiral case outer line is connected with the diameter D of the wind wheel, the spiral case design matched with the wind wheel can be controlled in an application range more efficiently and more generally, wherein the Y value controls the diffusion degree of the spiral case, the larger the Y value is, the stronger the diffusion capacity is, but the overlarge negative pressure gradient can be caused, the diffusion loss is caused, and the size is larger, so that the Y value is limited in the range, and the spiral case with higher efficiency can be matched with the wind wheel more rapidly and efficiently.
Further describing, in S4, defining distances and angular relationships between all volute tongue position design points in sequence according to the defined volute casing position design points; the method specifically comprises the following steps:
The connection line between the starting point Pk of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PkO', the connection line between the ending point Pn of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PnO', and an included angle beta formed by the straight line segment PkO 'and the straight line segment PnO' is more than or equal to 3 degrees and less than or equal to 20 degrees.
To further illustrate, in S6, a plurality of design points of the volute position are selected from all control points on the volute line II, specifically including:
If the number of the volute position design points is 8, the 8 volute position design points are respectively P1, P2, P3, P4, P5, P6, P7 and P8, wherein the included angle between each two adjacent points P1-P8 and the connecting line of the circle center O' of the wind wheel is alpha, and the alpha is 45 degrees.
Further describing, in S6, a plurality of tongue position design points are selected from all control points on the tongue profile IV; the method specifically comprises the following steps:
If the number of the volute tongue position design points is 2, the 2 volute tongue position design points are respectively P9 and P10, a connecting line between the volute tongue position design points P9 and P10 is a straight line segment P9P10, and a connecting line between the volute tongue position design points P7 and P8 is an arc line segment P7P8, wherein the straight line segment P9P10 is tangent to the arc line segment P7P 8.
And line parameter adjustment is carried out on the distance range and the angle range defined by the volute molded line II and the volute tongue molded line IV, so that the air flow efficiency among the volute molded line II, the volute tongue molded line IV and the wind wheel circle O' is kept in an optimal range without repeated adjustment.
Further describing, in S5, defining the distance and angle relation between all control points on the volute tongue inner profile III according to the wind wheel diameter D and the defined volute tongue position design point; the method specifically comprises the following steps:
the volute tongue inner line III comprises a volute tongue radius III-1 and a diffusion line III-2, the volute tongue radius/wind wheel diameter D is smaller than or equal to 0.03 and smaller than or equal to 0.06, and the included angle between the diffusion line and the straight line segment P9P10 is smaller than or equal to 20 degrees.
In this embodiment, when the volute tongue inner profile III is within this range, it is advantageous to have lower noise when diverting the volute outlet airflow.
As shown in fig. 7-8, a booster volute is manufactured using a booster volute design method as described above.
The technical principle of the present application is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the application and should not be taken in any way as limiting the scope of the application. Other embodiments of the application will occur to those skilled in the art from consideration of this specification without the exercise of inventive faculty, and such equivalent modifications and alternatives are intended to be included within the scope of the application as defined in the claims.
Claims (10)
1. The design method of the supercharging volute is characterized by comprising the following steps of:
S1, determining a z-axis direction and an axis O according to the direction of a rotating shaft of a wind wheel and an airflow inlet of a volute, respectively defining an x-axis direction and a y-axis direction along two directions perpendicular to the z-axis and mutually perpendicular to each other, and establishing a three-dimensional coordinate system x-y-z;
S2, carrying out horizontal section on a coordinate system x-y through an axle center O to obtain a wind wheel molded line I of a wind wheel, a volute molded line II of a volute, a volute tongue inner molded line III of a volute tongue and a volute tongue outer molded line IV, and respectively controlling the volute molded line II, the volute tongue inner molded line III and the volute tongue outer molded line IV by a multipoint control method;
S3, setting a diffusion coefficient Y according to the circle center O' of the wind wheel and the diameter D of the wind wheel, and sequentially limiting the distance and the angle relation between all control points of the volute tongue outer line IV;
s4, sequentially limiting the distance and the angle relation among all volute tongue position design points according to the limited volute position design points;
S5, defining the distance and angle relation between all control points on a volute tongue inner profile III in sequence according to the diameter D of the wind wheel and the defined volute tongue position design point;
S6, screening a plurality of volute position design points from all control points on a volute molded line II, and cutting off a plurality of volute airflow flow cross sections along a direction parallel to a z axis by connecting lines between the volute position design points and a wind wheel circle center O'; screening a plurality of volute tongue position design points from all control points on a volute tongue appearance line IV, and cutting a plurality of volute tongue airflow flow cross sections along the direction parallel to the x axis after passing through the volute tongue position design points;
s7, all the volute airflow flow cross sections are projected on a coordinate system x-z according to the corresponding volute position design points and the volute tongue airflow flow cross sections are projected on the coordinate system x-z according to the corresponding volute tongue position design points so as to determine upper vertexes and lower vertexes of the volute airflow flow cross sections and the volute tongue airflow flow cross sections; wherein the upper vertex is the vertex closest to the wind wheel airflow inlet, and the lower vertex is the vertex farthest from the wind wheel airflow inlet;
S8, adjusting line parameters among a plurality of volute airflow cross sections and control points on the volute tongue airflow cross sections by a multipoint control method after all upper vertexes meet a first preset condition and all lower vertexes meet a second preset condition, so as to obtain a quasi-circular curve;
S9, sequencing all the quasi-circular curves along the airflow outlet direction of the volute, calculating the areas of all the quasi-circular curves, comparing the areas of all the quasi-circular curves in pairs according to sequencing to obtain a plurality of comparison results, judging whether the comparison results meet the judgment conditions, outputting all the quasi-circular curves with the sequencing completed if the comparison results meet the judgment conditions, and repeating S8 if the comparison results do not meet the judgment conditions;
And S10, sequentially stretching all the circular-like curves subjected to sequencing to form a wind wheel airflow circulation channel, and combining with a volute tongue inner line III to complete the design of the supercharging volute.
2. The method according to claim 1, wherein in S8, if the number of upper vertices is 10;
Let the absolute values of z values of 10 upper vertices on the coordinate system x-z be z 1 (upper), z 2 (upper), z 3 (upper), z 4 (upper), z 5 (upper), z 6 (upper), z 7 (upper), z 8 (upper), z 9 (upper), and z 10 (upper), the first preset condition being z 1 (upper) =z 2 (upper) =z 3 (upper) =z 4 (upper) =z 5 (upper) =z 6 (upper) =z 7 (upper) =z 8 (upper) =z 9 (upper) =z 10 (upper);
If the number of the lower vertexes is 10;
Let the absolute values of z values of 10 lower vertices on coordinate system x-z be z 1 (lower), z 2 (lower), z 3 (lower), z 4 (lower), z 5 (lower), z 6 (lower), z 7 (lower), z 8 (lower), z 9 (lower), and z 10 (lower), the second preset condition be z 1 (lower) =z 2 (lower) =z 3 (lower) =z 4 (lower) =z 5 (lower) < z 6 (lower) < z 7 (lower) < z 8 (lower) < z 9 (lower) < z 10 (lower).
3. The method according to claim 1, wherein in S8, the quasi-circular curve includes 8 control points and a center point 0", and the 8 control points are P (0), P (1), P (2), P (3), P (4), P (5), P (6) and P (7), and the quasi-circular curve is composed of straight line segment P (0) P (7), arc line segment P (0) P (1), straight line segment P (1) P (2), arc line segment P (2) P (3), straight line segment P (3) P (4), arc line segment P (4) P (5), straight line segment P (5) P (6) and arc line segment P (6) P (7);
The chamfering device comprises a chamfering device, a chamfering device and a chamfering device, wherein the chamfering device comprises an arc line section P (0) P (1) is R1, the chamfering device comprises an arc line section P (2) P (3) is R2, the chamfering device comprises an arc line section P (4) P (5) is R3, the chamfering device comprises an arc line section P (6) P (7) is R4, the length of a straight line section P (0) P (7) is H1, the length of a straight line section P (3) P (4) is H2, the length of a straight line section P (1) P (2) is L1, the length of a straight line section P (5) P (6) is L, the length of a wind wheel in the radial direction is L, and the length of a wind wheel in the height direction is H;
And satisfies the following relationship: r1=r2=r3=r4+_h1=h2; r1=r2=r3=r4+.l1=l2; l=2×r1+l1, h=2×r1+h1.
4. The method according to claim 2, wherein in S9, if the number of all the upper vertices and the lower vertices is 10, the number of the quasi-circular curves is 10, and the areas of the 10 quasi-circular curves are A1, A2, A3, A4, A5, A6, A7, A8, A9 and a10 according to the order, respectively, and the judgment condition is A1 < A2 < A3 < A4 < A5 < A6 < A7 < A8 < A9 < a10.
5. The method for designing a booster volute according to claim 1, wherein in S3, a diffusion coefficient Y is set according to a center O' of a wind wheel and a diameter D of the wind wheel, and distances and angular relationships between all control points of a volute tongue outer line IV are sequentially defined; the method specifically comprises the following steps:
S311, establishing a polar coordinate system r-theta according to the distances and angles between all control points of the volute outer line and the circle center O' of the wind wheel; the starting point of the volute molded line II and the wind wheel molded line I are intersected at a control point P0, the ending point of the volute molded line II and the starting point of the volute tongue outer molded line IV are connected to a control point Pk, and the ending point of the volute tongue outer molded line IV is Pn and is more than 0 and less than n; the number of all control points of the volute type line II is k, and P0, P1 … …, pt, … … and P (k) are set; t is more than or equal to 1 and less than or equal to k;
S312, setting a diffusion coefficient Y in a polar coordinate system r-theta, wherein the coordinates of all control points on a volute molded line II are defined as (rt, thetat), Y is more than or equal to 0.2 and less than or equal to 0.5, (r 0, theta0) = (-D/2, 0), pt=1/k+Pt-1, rt= ±0.5+Pt x Y x D, wherein +/-depends on the quadrant where the thetat angle value is located in a two-dimensional plane coordinate system, the 1 st quadrant and the 2 nd quadrant are +, the 3 rd quadrant and the 4 th quadrant are (-0, thetat= -Pt x 360 degrees).
6. The method according to claim 5, wherein in S4, distances and angular relationships between all volute tongue position design points are sequentially defined according to the defined volute tongue position design points; the method specifically comprises the following steps:
The connection line between the starting point Pk of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PkO', the connection line between the ending point Pn of the volute tongue external line IV and the wind wheel circle O 'is a straight line segment PnO', and an included angle beta formed by the straight line segment PkO 'and the straight line segment PnO' is more than or equal to 3 degrees and less than or equal to 20 degrees.
7. The method of claim 6, wherein in S6, a plurality of design points for the volute position are selected from all control points on the volute line II, specifically comprising:
If the number of the volute position design points is 8, the 8 volute position design points are respectively P1, P2, P3, P4, P5, P6, P7 and P8, wherein the included angle between each two adjacent points P1-P8 and the connecting line of the circle center O' of the wind wheel is alpha, and the alpha is 45 degrees.
8. The method of claim 7, wherein in S6, a plurality of volute tongue position design points are selected from all control points on the volute tongue outer line IV; the method specifically comprises the following steps:
If the number of the volute tongue position design points is 2, the 2 volute tongue position design points are respectively P9 and P10, a connecting line between the volute tongue position design points P9 and P10 is a straight line segment P9P10, and a connecting line between the volute tongue position design points P7 and P8 is an arc line segment P7P8, wherein the straight line segment P9P10 is tangent to the arc line segment P7P 8.
9. The method according to claim 8, wherein in S5, distances and angular relationships between all control points on the volute inner profile III are sequentially defined according to the wind wheel diameter D and the defined volute tongue position design points; the method specifically comprises the following steps:
the volute tongue inner line III comprises a volute tongue radius III-1 and a diffusion line III-2, the volute tongue radius/wind wheel diameter D is smaller than or equal to 0.03 and smaller than or equal to 0.06, and the included angle between the diffusion line and the straight line segment P9P10 is smaller than or equal to 20 degrees.
10. A booster volute manufactured by a booster volute design method according to any one of claims 1-9.
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