CN109711045B - Smooth modeling method for volute of centrifugal pump - Google Patents
Smooth modeling method for volute of centrifugal pump Download PDFInfo
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- CN109711045B CN109711045B CN201811600572.8A CN201811600572A CN109711045B CN 109711045 B CN109711045 B CN 109711045B CN 201811600572 A CN201811600572 A CN 201811600572A CN 109711045 B CN109711045 B CN 109711045B
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Abstract
The invention belongs to the technical field of three-dimensional modeling of centrifugal pumps, and particularly relates to a smooth modeling method of a volute of a centrifugal pump. The method is based on UG NX modeling, and by adopting the cooperation of tools such as isoparametric curves, bridging curves and the like, the problems of modeling distortion and unsmooth curved surface connection which are easily caused when the tongue portion of the volute is processed by means of artificial visual inspection in a general volute modeling method can be effectively solved. The method can realize complete smooth transition between the curved surfaces of the partition tongue part of the generated centrifugal pump volute, so that no further processing is needed in the actual manufacturing process of the centrifugal pump, the modeling cost is reduced, and the modeling quality is improved. The volute modeling completed by the method has clear modeling structure and natural and beautiful curved surface transition, and the method can improve the precision and accuracy of CFD simulation, finite element analysis and die numerical control processing of the centrifugal pump.
Description
Technical Field
The invention belongs to the technical field of three-dimensional modeling of centrifugal pumps, and particularly relates to a centrifugal pump volute fairing modeling method based on UG NX.
Background
A pumping chamber of the centrifugal pump, also called a volute, is one of key flow passing components of the centrifugal pump, can convert the kinetic energy of fluid into pressure energy, eliminates the velocity circulation and has great influence on the hydraulic performance of the centrifugal pump. In the design and manufacturing process of the centrifugal pump, the three-dimensional modeling of the volute is one of the key steps of CFD simulation, finite element analysis and die numerical control machining. The partition tongue is used as the most complex part of the volute, and the quality of the three-dimensional modeling curved surface smoothness degree directly relates to the precision of numerical simulation and the quality of pump body processing and manufacturing. The centrifugal pump has important significance for improving the design level and the manufacturing level of the centrifugal pump.
The three-dimensional modeling of the tongue-isolating part is the key point and the difficulty of the volute modeling. The existing common modeling method is usually characterized in that a spline curve is added at a volute tongue partition as a guide line generated by a tongue partition surface, the shape of the spline curve is completely judged by visual inspection, and the smoothness of the generated tongue partition surface cannot be guaranteed. In some methods, the shape of the tongue separation part is finished by rounding the tongue separation part, and because the tongue separation part is a complex space curved surface, the real curved surface shape of the tongue separation part cannot be reflected by a simple rounding. In the actual manufacturing process of the centrifugal pump, the tongue-separating part of the mold is smooth by means of fine trimming of a casting model and the like. The general three-dimensional modeling method is difficult to achieve complete smooth transition between the curved surfaces of the tongue isolation part, so that the modeling quality is low.
Disclosure of Invention
The invention aims to provide a centrifugal pump volute fairing modeling method which is based on UG NX, adopts tools such as isoparametric curves, bridging curves and the like to be matched for use, and can effectively solve the problems of modeling distortion and unsmooth curved surface connection which are easily caused when the general volute modeling method depends on artificial visual inspection and the volute tongue separation part is processed.
In order to achieve the purpose, the invention provides the following technical scheme:
a centrifugal pump volute fairing molding method comprises the following steps:
a. respectively drawing three-dimensional sketch maps of a spiral part and a diffusion section part of a centrifugal pump volute, comprising the following steps:
a1. selecting a plurality of sections of the centrifugal pump volute on a two-dimensional drawing of the centrifugal pump volute, wherein the sections comprise:
1. first 1 to eighth 8 cross-sections of the spiral portion of the centrifugal pump volute:
the selection method comprises the following steps: selecting a section at intervals of 45 degrees along the spiral part of the centrifugal pump volute in the anticlockwise direction to obtain first sections 1 to eighth sections 8 of the spiral part of the centrifugal pump volute, wherein the first sections 1 to the eighth sections 8 are all positioned in a plane passing through the center of a base circle 13; wherein the heights of the first section 1 to the eighth section 8 are sequentially increased.
2. Fourteenth cross-section 14 of the spiral portion of the centrifugal pump volute and fifteenth cross-section 15 of the diffuser portion of the centrifugal pump volute:
the selection steps are as follows: the junction of the spiral part and the diffuser section of the centrifugal pump volute is located between the first section 1 and the eighth section 8 and is connected by a barrier arc 23.
The fourteenth section 14 is selected at the spiral part of the volute of the centrifugal pump and is positioned in a plane passing through the upper end point of the arc 23 of the partition tongue and the center of the base circle 13.
And a fifteenth section 15 is selected at the volute diffusion section part of the centrifugal pump, and is the cross section of the volute diffusion section of the centrifugal pump passing through the lower end point of the partition tongue circular arc 23.
3. Ninth 9, tenth 10, eleventh 11 and outlet 12 cross-sections of the diffuser section part of the centrifugal pump volute:
the selection steps are as follows: a ninth section 9 is selected in the volute divergent section part of the centrifugal pump, which is located between the fifteenth section 15 and the outlet section 12 of the volute divergent section part of the centrifugal pump; the ninth section 9 is parallel to the fifteenth section 15 at a distance from the fifteenth section 15 of the diameter of the tongue partition arc 23.
A tenth section 10 and an eleventh section 11 are selected at the volute diffusion section part of the centrifugal pump, and the tenth section 10 and the eleventh section 11 are respectively parallel to a fifteenth section 15 and are taken at the trisection position from the ninth section 9 to the outlet section 12 and are rounded.
a2. From the respective cross-sectional positions determined in step a1, the following two-dimensional sketch is drawn:
1. the base circle 13.
2. The spiral portion of the centrifugal pump volute has a first section 1, a second section 2, a third section 3, a fourth section 4, a fifth section 5, a sixth section 6, a seventh section 7, an eighth section 8 and a fourteenth section 14.
3. Ninth 9, tenth 10, eleventh 11, outlet 12 and fifteenth 15 cross-sections of the diffuser section part of the centrifugal pump volute. Wherein the content of the first and second substances,
the radius of the fourteenth upper corner arc 213 of the fourteenth cross section 14 is 50% -100% of the radius of the first upper corner arc 215 of the first cross section 1, and is rounded.
The fifteenth upper corner arc 218 of the fifteenth cross-section 15 has the same radius as the ninth upper corner arc 210 of the ninth cross-section 9.
The radius of the fifteenth lower corner circular arc 219 of the fifteenth cross-section 15 is 50% -100% of the radius of the ninth lower corner circular arc 222 of the ninth cross-section 9.
a3. And (c) respectively generating three-dimensional sketches of the spiral part and the diffuser part of the centrifugal pump volute according to the base circle 13 drawn in the step a2 and the two-dimensional sketches of the sections and the positions of the base circle 13 and the sections in the two-dimensional drawing of the centrifugal pump volute in the step a1.
b. Generating three-dimensional curved surfaces of a spiral part and a diffusion section part of the centrifugal pump volute;
and (c) respectively connecting the sections of the spiral part of the centrifugal pump volute and the diffusion section part of the centrifugal pump volute which are drawn in the step (a), generating a curved surface 31 of the spiral section of the centrifugal pump volute and a curved surface 32 of the diffusion section of the centrifugal pump volute, and filling the base circle 13 to generate a plane 33 of the base circle.
c. Drawing an isoparametric curve and a bridging curve to generate a tongue isolating curved surface 34 and a connecting section curved surface 35;
at least 20 isoparametric curves intersected with the fourteenth section 14 to the eighth section 8 are marked on a spiral section curved surface 31 of the centrifugal pump volute, and at least 20 isoparametric curves intersected with the fifteenth section 15 to the twelfth section 12 are marked on a diffusion section curved surface 32 of the centrifugal pump volute; wherein, two end points of the isoparametric curve intersecting the fourteenth section 14 to the eighth section 8 are respectively on the fourteenth section 14 and on the eighth section 8; the two end points of the isoparametric curve intersecting the fifteenth section 15 to the twelfth section 12 are on the fifteenth section 15 and the twelfth section 12, respectively; drawing not less than eight bridging curves for connecting two isoparametric curves at the corresponding positions of the fourteenth cross section 14 and the fifteenth cross section 15, and drawing not less than six bridging curves for connecting two isoparametric curves at the corresponding positions of the eighth cross section 8 and the fifteenth cross section 15.
According to the bridging curve, the tongue isolation curved surface 34 and the connecting section curved surface 35 are generated.
d. Sewing the curved surfaces and supplementing the central curved surface 36;
and (c) sewing the spiral section curved surface 31, the diffusion section curved surface 32 and the base circle plane 33 generated in the step b, and the tongue isolating curved surface 34 and the connecting section curved surface 35 generated in the step c.
Complementing the central curved surface 36.
e. Mirror stitching;
and (3) mirroring the spiral section curved surface 31 of the centrifugal pump volute, the diffusion section curved surface 32 of the centrifugal pump volute, the base circle plane 33, the tongue isolating curved surface 34 and the connecting section curved surface 35 along the symmetrical plane X-Y, and sewing after mirroring to finish all smooth modeling steps of the centrifugal pump volute.
The method is based on UG NX software for drawing.
In step a1, the eighth cross-section 8 is the largest height cross-section of the spiral portion of the centrifugal pump volute taken through a plane passing through the center of the base circle 13.
In the step b, the sections are connected by adopting a tool of 'through curve grid' in UG NX software, and the base circle 13 is filled by adopting a tool of 'filling a curved surface' to generate a base circle plane 33.
And c, operating by adopting an 'isoparametric curve' tool in UG NX software.
The supplementary central curved surface 36 of step d is operated by means of an "N-edge curved surface" tool; wherein, the 'constraint surface' option in the 'N-edge curved surface' tool selects a spiral section curved surface 31, a diffusion section curved surface 32, a base circle plane 33, a tongue isolating curved surface 34 and a connecting section curved surface 35; the "continuity" option, select "G1 tangent".
Compared with the prior art, the invention has the beneficial effects that:
1) the smooth modeling method of the centrifugal pump volute can realize complete smooth transition between the curved surfaces of the partition tongue part of the generated centrifugal pump volute, so that no further processing is needed in the actual manufacturing process of the centrifugal pump, the modeling cost is reduced, and the modeling quality is improved.
2) The volute molding finished by the method has clear molding structure and natural and beautiful curved surface transition, and the method can improve the precision and accuracy of CFD simulation, finite element analysis and die numerical control processing of the centrifugal pump.
Drawings
FIG. 1 is a schematic two-dimensional drawing of a centrifugal pump volute marked with selected positions of various sections in the centrifugal pump volute fairing molding method of the invention;
FIG. 2 is a two-dimensional sketch of a first cross section to an eighth cross section and a fourteenth cross section of a spiral part of a volute, which is drawn according to a volute two-dimensional drawing in the centrifugal pump volute fairing modeling method of the invention;
FIG. 3 is a two-dimensional sketch of a fifteenth cross section of a centrifugal pump volute casing diffuser section part drawn according to a volute casing two-dimensional drawing in the centrifugal pump volute casing fairing moulding method of the invention;
FIG. 4 is a two-dimensional sketch of a ninth cross section of a centrifugal pump volute diffuser section part drawn according to a two-dimensional drawing of the centrifugal pump volute in the centrifugal pump volute fairing moulding method of the invention;
FIG. 5 is a two-dimensional sketch of a tenth section and an eleventh section of a centrifugal pump volute diffusion section part drawn according to a two-dimensional drawing of the centrifugal pump volute in the centrifugal pump volute fairing moulding method of the invention;
FIG. 6 is a schematic drawing of a three-dimensional sketch of a centrifugal pump volute in the centrifugal pump volute fairing molding method of the invention;
FIG. 7 is a schematic diagram of generating a spiral section curved surface of a centrifugal pump volute and a diffuser section curved surface of the centrifugal pump volute in the centrifugal pump volute fairing molding method of the present invention;
FIG. 8 is a schematic drawing of an isoparametric curve and a bridging curve of the centrifugal pump volute in the centrifugal pump volute fairing method of the invention;
FIG. 9 is a schematic drawing of the curved surface of the volute N side of the centrifugal pump in the centrifugal pump volute fairing molding method of the invention;
fig. 10 is a schematic diagram of the centrifugal pump volute fairing modeling method of the invention, which is used for checking the surface fairing degree by reflection analysis after the drawing of the centrifugal pump volute is completed.
Wherein the reference numerals are:
1 first cross section 2 second cross section
3 third section 4 fourth section
5 fifth cross section 6 sixth cross section
7 seventh cross section 8 eighth cross section
9 ninth section 10 tenth section
11 eleventh section 12 outlet section
13 base circle 14 fourteenth cross section
15 fifteenth cross-section 23 tongue partition arc
210 ninth upper corner arc 213 fourteenth upper corner arc
215 first upper corner arc 218 fifteenth upper corner arc
219 fifteenth lower corner arc 222 ninth lower corner arc
31 helical section curved surface 32 diffuser section curved surface
33 base circle plane 34 tongue isolating curved surface
35 connecting section curved surface 36 central curved surface
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 to 9, the complete smooth modeling method of the centrifugal pump volute comprises the following steps:
a. respectively drawing three-dimensional sketch maps of a spiral part and a diffusion section part of a centrifugal pump volute, comprising the following steps:
a1. selecting a plurality of sections of the centrifugal pump volute on a two-dimensional drawing of the centrifugal pump volute, wherein the plurality of sections comprise:
1. first 1 to eighth 8 cross-sections of the spiral portion of the centrifugal pump volute:
the selection method comprises the following steps: selecting a section at intervals of 45 degrees along the spiral part of the centrifugal pump volute in the anticlockwise direction to obtain first sections 1 to eighth sections 8 of the spiral part of the centrifugal pump volute, wherein the first sections 1 to the eighth sections 8 are all located in a plane passing through the center of a base circle 13. Wherein the heights of the first section 1 to the eighth section 8 are sequentially increased. Preferably, the eighth cross-section 8 is the largest height cross-section of the spiral portion of the centrifugal pump volute, taken with a plane passing through the center of the base circle 13.
2. Fourteenth cross-section 14 of the spiral portion of the centrifugal pump volute and fifteenth cross-section 15 of the diffuser portion of the centrifugal pump volute:
the selection steps are as follows: the junction of the spiral part and the diffuser section of the centrifugal pump volute is located between the first section 1 and the eighth section 8 and is connected by a barrier arc 23.
The fourteenth section 14 is selected at the spiral part of the volute of the centrifugal pump and is positioned in a plane passing through the upper end point of the arc 23 of the partition tongue and the center of the base circle 13.
And a fifteenth section 15 is selected at the volute diffusion section part of the centrifugal pump, and is the cross section of the volute diffusion section of the centrifugal pump passing through the lower end point of the partition tongue circular arc 23.
3. Ninth 9, tenth 10, eleventh 11 and outlet 12 cross-sections of the diffuser section part of the centrifugal pump volute:
the selection steps are as follows: a ninth cross section 9 is taken in the centrifugal pump volute diffuser section, which is located between the fifteenth cross section 15 and the outlet cross section 12 of the centrifugal pump volute diffuser section. The ninth section 9 is parallel to the fifteenth section 15 at a distance from the fifteenth section 15 of the diameter of the tongue partition arc 23.
A tenth section 10 and an eleventh section 11 are selected at the volute diffusion section part of the centrifugal pump, and the tenth section 10 and the eleventh section 11 are respectively parallel to a fifteenth section 15 and are taken at the trisection position from the ninth section 9 to the outlet section 12 and are rounded.
a2. As shown in fig. 2 to 5, the following two-dimensional sketch is drawn in UG NX software according to each section position determined in step a 1:
1. a base circle 13;
2. a first section 1, a second section 2, a third section 3, a fourth section 4, a fifth section 5, a sixth section 6, a seventh section 7, an eighth section 8 and a fourteenth section 14 of the spiral portion of the volute of the centrifugal pump, as shown in figure 2;
3. ninth, tenth, eleventh, outlet and fifteenth cross-sections 9, 10, 11, 12, 15 of the volute diffuser section portion of the centrifugal pump, as shown in figures 3 to 5; wherein the content of the first and second substances,
the radius of the fourteenth upper corner arc 213 of the fourteenth cross section 14 is 50% -100% of the radius of the first upper corner arc 215 of the first cross section 1, and is rounded;
the fifteenth upper corner arc 218 of the fifteenth cross-section 15 has the same radius as the ninth upper corner arc 210 of the ninth cross-section 9;
the radius of the fifteenth lower corner circular arc 219 of the fifteenth cross-section 15 is 50% -100% of the radius of the ninth lower corner circular arc 222 of the ninth cross-section 9.
a3. According to the two-dimensional sketch of the base circle 13 and each section drawn in the step a2, according to the positions of the base circle 13 and each section in the two-dimensional drawing of the centrifugal pump volute in the step a1, three-dimensional sketches of the spiral part and the diffuser part of the centrifugal pump volute are respectively generated, as shown in fig. 6.
b. Generating three-dimensional curved surfaces of a spiral part and a diffusion section part of the centrifugal pump volute;
as shown in fig. 7, a tool of "through curve grid" in the UG NX software is used to connect the cross sections of the spiral part of the centrifugal pump volute and the diffuser part of the centrifugal pump volute, which have been already drawn in step a, respectively, to generate a spiral curved surface 31 of the centrifugal pump volute and a diffuser curved surface 32 of the centrifugal pump volute, and a tool of "filling curved surface" is used to fill the base circle 13 to generate a base circle plane 33.
c. Drawing an isoparametric curve and a bridging curve to generate a tongue isolating curved surface 34 and a connecting section curved surface 35;
as shown in fig. 8, by using the "isoparametric curve" tool in the UG NX software, not less than 20 isoparametric curves intersecting the fourteenth cross section 14 to the eighth cross section 8 are marked on the spiral curved surface 31 of the centrifugal pump volute, and not less than 20 isoparametric curves intersecting the fifteenth cross section 15 to the twelfth cross section 12 are marked on the divergent curved surface 32 of the centrifugal pump volute. Wherein, two end points of the isoparametric curve intersecting the fourteenth section 14 to the eighth section 8 are respectively on the fourteenth section 14 and on the eighth section 8; the two end points of the isoparametric curve intersecting the fifteenth section 15 to the twelfth section 12 are on the fifteenth section 15 and the twelfth section 12, respectively.
Drawing not less than eight bridging curves for connecting two isoparametric curves at the corresponding positions of the fourteenth cross section 14 and the fifteenth cross section 15, and drawing not less than six bridging curves for connecting two isoparametric curves at the corresponding positions of the eighth cross section 8 and the fifteenth cross section 15. And generating the tongue isolating curved surface 34 and the connecting section curved surface 35 according to the bridging curve by adopting a 'through curve grid' tool in UG NX software.
d. Sewing the curved surfaces and supplementing the central curved surface 36;
as shown in fig. 9, the spiral curved surface 31, the diffuser curved surface 32, and the base circular plane 33 generated in step b, and the tongue-separating curved surface 34 and the connecting curved surface 35 generated in step c are sewn together.
The central curve 36 is supplemented with an "N-edge curve" tool. Wherein, the 'constraint surface' option in the 'N-edge curved surface' tool selects a spiral section curved surface 31, a diffusion section curved surface 32, a base circle plane 33, a tongue isolating curved surface 34 and a connecting section curved surface 35; the "continuity" option, select "G1 (tangent)".
e. Mirror stitching;
and mirroring the spiral section curved surface 31 of the centrifugal pump volute, the diffusion section curved surface 32 of the centrifugal pump volute, the base circle plane 33, the tongue isolating curved surface 34 and the connecting section curved surface 35 along the symmetrical plane X-Y, and sewing after mirroring to complete the whole modeling step of the centrifugal pump volute.
Examples
Modeling according to the complete smooth modeling method of the centrifugal pump volute:
a. and respectively drawing three-dimensional sketch maps of the spiral part and the diffuser section part of the centrifugal pump volute.
Wherein, the radius of the partition tongue arc 23 is 3 mm. The radius of the fourteenth upper corner arc 213 of the fourteenth cross section 14 is 13 mm; the radius of the first upper corner arc 215 of the first cross section 1 is 15 mm. The radii of the fifteenth upper corner arc 218 of the fifteenth cross section 15 and the ninth upper corner arc 210 of the ninth cross section 9 are both 10 mm; the radius of the fifteenth lower corner arc 219 of the fifteenth cross-section 15 is 21.5mm and the radius of the ninth lower corner arc 222 of the ninth cross-section 9 is 22 mm.
b. And generating three-dimensional curved surfaces of a spiral part and a diffuser section part of the centrifugal pump volute.
c. And drawing an isoparametric curve and a bridging curve to generate a tongue isolating curved surface 34 and a connecting section curved surface 35.
8 isoparametric curves intersected with the fourteenth section 14 to the eighth section 8 are divided on a spiral section curved surface 31 of the centrifugal pump volute, and 50 isoparametric curves intersected with the fifteenth section 15 to the twelfth section 12 are divided on a diffuser section curved surface 32 of the centrifugal pump volute. Wherein, two end points of the isoparametric curve intersecting the fourteenth section 14 to the eighth section 8 are respectively on the fourteenth section 14 and on the eighth section 8; the two end points of the isoparametric curve intersecting the fifteenth section 15 to the twelfth section 12 are on the fifteenth section 15 and the twelfth section 12, respectively.
Drawing 8 bridging curves for connecting two isoparametric curves at the corresponding positions of the fourteenth section 14 and the fifteenth section 15, and drawing 7 bridging curves for connecting two isoparametric curves at the corresponding positions of the eighth section 8 and the fifteenth section 15;
d. stitching the curved surface and complementing the central curved surface 36.
e. And (4) mirror image stitching.
And obtaining the completely smooth volute through the steps. As shown in fig. 10, the surface smoothness was examined by reflection analysis, and the surface was completely smooth.
Claims (6)
1. A centrifugal pump volute fairing modeling method is characterized in that: the method comprises the following steps:
a. respectively drawing three-dimensional sketch maps of a spiral part and a diffusion section part of a centrifugal pump volute, comprising the following steps:
a1. selecting a plurality of sections of the centrifugal pump volute on a two-dimensional drawing of the centrifugal pump volute, wherein the sections comprise:
1. first (1) to eighth (8) cross-sections of the spiral portion of the centrifugal pump volute:
the selection method comprises the following steps: selecting a section at intervals of 45 degrees along the spiral part of the centrifugal pump volute in the anticlockwise direction to obtain first sections (1) to eighth sections (8) of the spiral part of the centrifugal pump volute, wherein the first sections (1) to the eighth sections (8) are all located in a plane passing through the center of a base circle (13); wherein the heights of the first section (1) to the eighth section (8) are sequentially increased;
2. fourteenth cross section (14) of centrifugal pump volute spiral portion and fifteenth cross section (15) of centrifugal pump volute diffuser portion:
the selection steps are as follows: the joint of the spiral part and the diffusion section part of the centrifugal pump volute is positioned between the first section (1) and the eighth section (8) and is connected through a partition tongue circular arc (23);
a fourteenth section (14) is selected at the spiral part of the volute of the centrifugal pump and is positioned in a plane passing through the upper end point of the partition tongue circular arc (23) and the center of the base circle (13);
a fifteenth section (15) is selected at the volute diffusion section part of the centrifugal pump, and is the cross section of the volute diffusion section of the centrifugal pump passing through the lower end point of the partition tongue arc (23);
3. ninth (9), tenth (10), eleventh (11) and outlet section (12) of the volute diffuser section of the centrifugal pump:
the selection steps are as follows: selecting a ninth section (9) in the volute divergent section part of the centrifugal pump, which is positioned between the fifteenth section (15) and the outlet section (12) of the volute divergent section part of the centrifugal pump; the ninth section (9) is parallel to the fifteenth section (15), and the distance between the ninth section (9) and the fifteenth section (15) is the diameter of the tongue separating arc (23);
a tenth section (10) and an eleventh section (11) are selected at the volute diffusion section part of the centrifugal pump, the tenth section (10) and the eleventh section (11) are respectively parallel to the fifteenth section (15) and are rounded at the trisection point position from the ninth section (9) to the outlet section (12);
a2. from the respective cross-sectional positions determined in step a1, the following two-dimensional sketch is drawn:
1. a base circle (13);
2. the spiral part of the centrifugal pump volute comprises a first section (1), a second section (2), a third section (3), a fourth section (4), a fifth section (5), a sixth section (6), a seventh section (7), an eighth section (8) and a fourteenth section (14);
3. a ninth section (9), a tenth section (10), an eleventh section (11), an outlet section (12) and a fifteenth section (15) of the volute diffuser section of the centrifugal pump; wherein the content of the first and second substances,
the radius of a fourteenth upper corner circular arc (213) of the fourteenth cross section (14) is 50% -100% of the radius of the first upper corner circular arc (215) of the first cross section (1), and the fourteenth upper corner circular arc is rounded;
the fifteenth upper corner circular arc (218) of the fifteenth cross section (15) has the same radius as the ninth upper corner circular arc (210) of the ninth cross section (9);
the radius of a fifteenth lower corner circular arc (219) of the fifteenth cross section (15) is 50-100% of the radius of a ninth lower corner circular arc (222) of the ninth cross section (9);
a3. according to the base circle (13) drawn in the step a2 and the two-dimensional sketch of each section, respectively generating three-dimensional sketches of the spiral part and the diffuser part of the centrifugal pump volute according to the positions of the base circle (13) and each section in the two-dimensional drawing of the centrifugal pump volute in the step a 1;
b. generating three-dimensional curved surfaces of a spiral part and a diffusion section part of the centrifugal pump volute;
respectively connecting the sections of the spiral part of the centrifugal pump volute and the diffusion section part of the centrifugal pump volute which are drawn in the step a to generate a spiral section curved surface (31) of the centrifugal pump volute and a diffusion section curved surface (32) of the centrifugal pump volute, and filling a base circle (13) to generate a base circle plane (33);
c. drawing an isoparametric curve and a bridging curve to generate a tongue isolating curved surface (34) and a connecting section curved surface (35);
at least 20 isoparametric curves intersected with a fourteenth section (14) to an eighth section (8) are marked off on a spiral section curved surface (31) of the centrifugal pump volute, and at least 20 isoparametric curves intersected with a fifteenth section (15) to a twelfth section (12) are marked off on a diffusion section curved surface (32) of the centrifugal pump volute; wherein two end points of the isoparametric curve which are intersected with the fourteenth section (14) to the eighth section (8) are respectively arranged on the fourteenth section (14) and the eighth section (8); two end points of the isoparametric curve which are intersected with the fifteenth section (15) to the twelfth section (12) are respectively arranged on the fifteenth section (15) and the twelfth section (12); drawing not less than eight bridging curves for connecting two isoparametric curves at the corresponding positions of the fourteenth section (14) and the fifteenth section (15), and drawing not less than six bridging curves for connecting two isoparametric curves at the corresponding positions of the eighth section (8) and the fifteenth section (15);
generating a tongue isolating curved surface (34) and a connecting section curved surface (35) according to the bridging curve;
d. sewing the curved surfaces and supplementing the central curved surface (36);
c, sewing the spiral section curved surface (31), the diffusion section curved surface (32) and the base circle plane (33) generated in the step b, and the tongue isolating curved surface (34) and the connecting section curved surface (35) generated in the step c;
a complementary central curved surface (36);
e. mirror stitching;
and (3) mirroring the spiral section curved surface (31), the diffusion section curved surface (32), the base circle plane (33), the tongue isolating curved surface (34) and the connecting section curved surface (35) of the centrifugal pump volute along the symmetrical plane X-Y, and sewing after mirroring to finish all smooth modeling steps of the centrifugal pump volute.
2. The centrifugal pump volute fairing method of claim 1, wherein: the method is based on UG NX software for drawing.
3. The centrifugal pump volute fairing method of claim 2, wherein: in step a1, the eighth cross-section (8) is the largest height cross-section of the spiral part of the centrifugal pump volute, taken on a plane passing through the centre of the base circle (13).
4. The centrifugal pump volute fairing method of claim 2, wherein: in the step b, the sections are connected by adopting a 'curve grid' tool in UG NX software, and a 'filling curved surface' tool is adopted to fill the base circle (13) to generate a base circle plane (33).
5. The centrifugal pump volute fairing method of claim 2, wherein: and c, operating by adopting an 'isoparametric curve' tool in UG NX software.
6. The centrifugal pump volute fairing method of claim 2, wherein:
d, operating the supplementary central curved surface (36) by adopting an N-edge curved surface tool; wherein, the 'constraint surface' option in the 'N-edge curved surface' tool selects a spiral section curved surface (31), a diffusion section curved surface (32), a base circle plane (33), a tongue isolating curved surface (34) and a connecting section curved surface (35); the "continuity" option, select "G1 tangent".
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811600572.8A CN109711045B (en) | 2018-12-26 | 2018-12-26 | Smooth modeling method for volute of centrifugal pump |
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| CN201811600572.8A CN109711045B (en) | 2018-12-26 | 2018-12-26 | Smooth modeling method for volute of centrifugal pump |
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| CN109711045A CN109711045A (en) | 2019-05-03 |
| CN109711045B true CN109711045B (en) | 2020-06-26 |
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| CN111843389B (en) * | 2020-07-24 | 2021-10-26 | 河南航天液压气动技术有限公司 | Centrifugal pump volute machining method |
| CN112524092A (en) * | 2020-11-27 | 2021-03-19 | 霍宏宇 | Variable-base-circle spiral pumping chamber |
| CN114483595B (en) * | 2021-12-24 | 2023-07-04 | 江西耐普矿机股份有限公司 | Hydraulic design method of quasi-annular pumping chamber for slurry pump and slurry pumping chamber |
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