CN104879316A - Stainless steel pulse-welded centrifugal pump impeller and improved welding method thereof - Google Patents
Stainless steel pulse-welded centrifugal pump impeller and improved welding method thereof Download PDFInfo
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- CN104879316A CN104879316A CN201510246139.9A CN201510246139A CN104879316A CN 104879316 A CN104879316 A CN 104879316A CN 201510246139 A CN201510246139 A CN 201510246139A CN 104879316 A CN104879316 A CN 104879316A
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Abstract
The invention provides a stainless steel pulse-welded centrifugal pump impeller and an improved welding method thereof. The stainless steel pulse-welded centrifugal pump impeller comprises a front cover plate, blades, a rear cover plate and a hub; first grooves as may as the blades are formed in one surface, coupled with the blades, of the front cover plate, and the shape of the first groove is the same as the shape of one end, close to the front cover plate, of the blade; second grooves as may as the blades are formed in one surface, coupled with the blades, of the rear cover plate, and the shape of the second groove is the same as the shape of one end, close to the rear cover plate, of the blade; in the welding process, according to the space curve shape of the fitted ends of the blades of an impeller model with the front cover plate and the rear cover plate, firstly, the first grooves and the second grooves are punched in the surfaces of the front cover plate and the rear cover plate, respectively, so that the two ends of each blade can be embedded into the front cover plate and the rear cover plat, and therefore, the impellers can be well fitted with each other during welding and the non-tight phenomena of solder skips and the like can be avoided, the strength of the impeller and the anti-cavitation performance index of the centrifugal pump can be improved, and furthermore, the performance efficiency of the impeller can be improved and the service life of the impeller can be prolonged.
Description
Technical field
The invention belongs to centrifugal pump technical field, especially relate to a kind of improvement welding method of stainless steel drift weldering formula centrifugal pump impeller, be mainly used in weld strength and the working life of improving punching weldering centrifugal pump impeller.
Background technique
Stamping-welded centrifugal pump blade is compared with casting impeller, it not integral cast, but need weld parts different for impeller to form impeller, therefore stamping-welded centrifugal pump technique relates to the multi-specialized cooperations such as pressure processing, welding, heat treatment and mould, and difficulty is large. togetherAt present, domestic most punch welding impeller, its front shroud all makes plane, blade is generally prismatic blade, and prismatic blade is not easily coupled with there being the front shroud of tapering upon bending, such liquid easily produces crossfire between runner, and produces harmful effect to the intensity of impeller.
In addition, for the impeller that front and rear cover plate is separated with blade, have to adopt on front and rear cover plate and blade, open the fixing method of tapped hole Cock screw, but punching weldering blade is thinner than cast blade, runner is smooth, perforate is unrealistic, and this means of fixation easily makes fluid crossfire between different runner, affects the efficiency of pump.Also there is the method adopting directly welding, but easily occur the shortcoming such as weld crack, lack of penetration, slag inclusion, pore and weld appearance due to common welding.These shortcomings can reduce section of weld joint and amass, and reduce bearing capacity, produce stress and concentrate, cause crackle, reduce fatigue strength, easily cause weldment to break and cause brittle failure.And front shroud and back shroud create special physicochemical change with the weld joint of blade owing to welding, the performance of material is caused to reduce, easily to corrode, when impeller works, if there is cavitation, this corrosion can become more serious, cause weld joint to be corroded to penetrate, produce crossfire between runner, pump efficiency sharply declines, and impeller life reduces.
Traditional welding procedure welding is used to there is many deficiencies, such as heat affected zone and weld zone width are very large, blade and cover plate contraction deformation is serious, the generation of harmful residual stress, welding speed is comparatively slow, alloying element exists evaporation loss or even blade welding failure.Laser bonding and these poor efficiency is used to compare with oxidizable welding procedure, the weld zone that optical fiber is stainless steel welded and heat affected zone width very little, in addition, the micro-penetration hardness that optical fiber does not lure steel to weld and tensile property higher, and optical-fiber laser transmission is flexible, control is convenient, in the position that impeller internal blade and the common welding of cover plate can not be soldered to, laser bonding can be soldered to.
Through retrieval, application number is that the utility model patent of CN201220645789 describes a kind of centrifugal pump impeller, the inner side surface of front shroud is evenly equipped with multiple blade groove, positioning hole is provided with in blade groove, the inner side surface of back shroud is evenly equipped with multiple blade corresponding with blade groove, blade is provided with the locating column corresponding with positioning hole, after front shroud and back shroud orientation assemble, is welded into an entirety.But this impeller is that casting forms, and is difficult to realize in stainless steel stamping-welded centrifugal pump field.The patent of improving one's methods at present about the welding of stainless steel drift weldering formula centrifugal pump impeller space curve yet there are no relevant report.
Summary of the invention
Front shroud is there is in prior art, easily there is solder skip in back shroud and blade weld, the deficiencies such as rosin joint, easily there is weld crack in common welding, lack of penetration, slag inclusion, the defect such as pore and weld appearance, the invention provides improving one's methods of a kind of stainless steel drift weldering formula centrifugal pump impeller space curve welding, by improving punching weldering impeller vane of centrifugal pumps front shroud and the manufacturing and designing of back shroud, by front shroud, back shroud and blade are fitted the groove held and stamp out and blade can be made to embed, blade processing process adopts laser reinforcing and optical fiber welding procedure, above-mentioned deficiency and defect is there is not after making blade and front and rear cover plate welding fabrication.
The present invention realizes above-mentioned technical purpose by following technological means.
A kind of stainless steel drift weldering formula centrifugal pump impeller, comprise front shroud, blade, back shroud and wheel hub, the front-end and back-end of described blade are respectively equipped with front shroud and back shroud, described back shroud rear end is provided with wheel hub, the one side that described front shroud is coupled with blade is provided with the first groove, the quantity of described first groove is identical with the quantity of blade, and the shape of described first groove is identical with the shape that blade presses close to front shroud one end; The one side that described back shroud is coupled with blade is provided with the second groove, and the quantity of described second groove is identical with the quantity of blade, and the shape of described second groove is identical with the shape that blade presses close to back shroud one end.
Further, described blade is curved vane or cylinder prismatic blade.
Further, the degree of depth of described first groove is 0.5mm-1mm, its width 0.1mm-0.5mm more than the width of blade laminating front shroud one end.
Further, the degree of depth of described first groove is 0.5mm, its width 0.1mm more than the width of blade laminating front shroud one end.
Further, described second depth of groove is 0.5mm-1mm, its width 0.1mm-0.5mm more than the width of blade laminating back shroud one end.
Further, described second depth of groove is 0.5mm, its width 0.1mm more than the width of blade laminating back shroud one end.
An improvement welding method for stainless steel drift weldering formula centrifugal pump impeller, comprises the steps:
Steps A: each parameter of Negotiation speed Y-factor method Y determination impeller, comprises vane inlet width b
1, blade exit width b
2, inlet blade angle laying angle β
1a, β
1b, β
1c, blade outlet angle laying angle β
2, subtended angle of blade ψ, vane thickness S
1, number of blade Z, front shroud internal diameter D
1, front shroud outer diameter D
2, front shroud thickness S
2, back shroud diameter D
3, back shroud thickness S
3, hub diameter d and hub thickness S
4; In CAD, described impeller pattern is set up with this;
Step B: according to impeller pattern described in steps A obtain respectively front shroud model and leaf model fit hold, shape that back shroud model and leaf model fit the space curve held;
Step C: stamp out initial blade according to impeller pattern described in steps A, the working surface of initial blade and the back side are through polishing, polishing, laser impact intensified; Afterwards with deionized water Cheongju wash, alcohol ultrasonic degreasing, obtain blade;
Step D: the shape of the space curve held of fitting according to the model of front shroud described in step B and leaf model, described front shroud with the plane that blade is coupled stamps out first groove identical with blade quantity; First depth of groove is 0.5-1mm, its width 0.1mm-0.5mm more than the width of blade laminating front shroud one end; Same, the shape of the space curve held of fitting according to back shroud model in step B and leaf model, stamps out the second groove by described back shroud, and the degree of depth of the first groove is 0.5-1mm, its width 0.1mm-0.5mm more than the width of blade laminating back shroud one end;
Step e: the two ends of blade are embedded respectively front shroud and back shroud and fixing relative position, first by blade and back shroud laser bonding, then weld blade and front shroud, finally by wheel hub and weldment weld; Butt welding subsequently practices midwifery to carry out polishing in raw weld zone, polishing, laser impact intensified, after through going to wash from sub-water Cheongju, alcohol ultrasonic degreasing, obtain impeller finished product.
Further, laser impact intensified equipment therefor described in step C is Nd:YAG laser.
Further, the equipment therefor of laser bonding described in step e is YLS-4000 optical fibre laser.
Further, in steps A, each parameter of impeller is as follows: vane inlet width b
1=35mm, blade exit width b
2=24mm, vane inlet laying angle β
1a=20 °, β
1b=25 °, β
1c=30 ° of blade exit laying angle β
2=27 °, subtended angle of blade ψ=130 °, vane thickness S
1=3mm, number of blade Z=6, front shroud internal diameter D
1=150mm, front shroud outer diameter D
2=300mm, front shroud thickness S
2=3mm, back shroud diameter D
3=300mm, back shroud thickness S
3=3mm, hub diameter d=80mm and hub thickness S
4=6mm.
Beneficial effect of the present invention:
The improvement welding method of stainless steel drift weldering formula centrifugal pump impeller of the present invention, according to impeller pattern Leaf and front shroud, the space curve shape of back shroud laminating end, in the fabrication stage of impeller, the one side of the laminating of front shroud and back shroud and blade stamps out the first groove and the second groove respectively, make blade two ends can embed in front shroud and back shroud, thus can fit preferably when welding, avoid occurring solder skip, the not tight phenomenon such as welding, improve the intensity of impeller and improve the anti-cavitation performance index of centrifugal pump, and then improve effectiveness of performance and the working life of impeller.In addition, in blade processing process, adopt laser reinforcing and optical fiber welding procedure, reach the object improving impeller blade surface strength and composite weld.
Accompanying drawing explanation
Fig. 1 is the structural representation of stainless steel drift weldering centrifugal pump impeller of the present invention.
Fig. 2 is the axis projection of stainless steel drift weldering centrifugal pump impeller of the present invention.
Fig. 3 is front shroud plane figure.
Fig. 4 is back shroud plane figure.
Description of reference numerals is as follows:
1-front shroud, 2-blade, 3-back shroud, 4-wheel hub, 5-first groove, 6-second groove.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
As depicted in figs. 1 and 2, a kind of stainless steel drift weldering formula centrifugal pump impeller, comprise front shroud 1, blade 2, back shroud 3 and wheel hub 4, the front-end and back-end of described blade 2 are respectively equipped with front shroud 1 and back shroud 3, described back shroud 3 rear end is provided with wheel hub 4, and described blade 2 is curved vane or cylinder prismatic blade.
As shown in Figure 3, the one side that described front shroud 1 is coupled with blade 2 is provided with the first groove 5, and the quantity of described first groove 5 is identical with the quantity of blade 2, and the shape of described first groove 5 is identical with one end shape that blade 2 presses close to front shroud 1; The degree of depth of described first groove 5 is 0.5mm-1mm, and its width has more 0.1mm-0.5mm than the fit width of front shroud 1 one end of blade 2.As shown in Figure 4, the one side that described back shroud 3 is coupled with blade 2 is provided with the second groove 6, the quantity of described second groove 6 is identical with the quantity of blade 2, the shape of described second groove 6 is identical with one end shape that blade 2 presses close to back shroud 3, described second groove 6 degree of depth is 0.5mm-1mm, and its width has more 0.1mm-0.5mm than the fit width of back shroud 3 one end of blade 2.
Improving one's methods of a kind of stainless steel drift weldering formula centrifugal pump impeller space curve welding, comprises the steps:
Steps A: each parameter of Negotiation speed Y-factor method Y determination impeller, i.e. vane inlet width b
1=35mm, blade exit width b
2=24mm, vane inlet laying angle β
1a=20 °, β
1b=25 °, β
1c=30 ° of blade exit laying angle β
2=27 °, subtended angle of blade ψ=130 °, vane thickness S
1=3mm, number of blade Z=6, front shroud internal diameter D
1=150mm, front shroud outer diameter D
2=300mm, front shroud thickness S
2=3mm, back shroud diameter D
3=300mm, back shroud thickness S
3=3mm, hub diameter d=80mm and hub thickness S
4=6mm; In CAD, described impeller pattern is set up with this;
Step B: according to impeller pattern described in steps A obtain respectively front shroud model and leaf model fit hold, shape that back shroud model and leaf model fit the space curve held;
Step C: obtain initial blade according to the punching press of impeller pattern described in steps A distortion, grinding and buffing is carried out to the front side of vane after punching press distortion and the back side, and adopt laser impact intensified with Nd:YAG laser to front side of vane and the back side, finally, the blade after laser impact intensified is put into Li Shui Cheongju wash and put into alcohol ultrasonic degreasing.
Step D: the shape of the space curve held of fitting according to the model of front shroud described in step B and leaf model, described front shroud 1 with the plane that blade 2 is coupled stamps out first groove 5 identical with blade 2 quantity; First groove 5 degree of depth is 0.5mm, and its width has more 0.1mm than the fit width of front shroud 1 one end of blade 2; Same, the shape of the space curve held of fitting according to back shroud model in step B and leaf model, it is 0.5mm that described back shroud 3 is also stamped out the degree of depth, and width has more second groove 6 of 0.1mm than the fit width of back shroud 3 one end of blade 2;
Step e: the two ends of blade 2 are embedded respectively front shroud 1 and back shroud 3 also fixing relative position, adopt YLS-4000 optical fibre laser to carry out optical-fiber laser welding to impeller.First by blade 2 and back shroud 3 laser bonding, then weld blade 2 and front shroud 1, finally by wheel hub 4 and weldment weld; Butt welding is subsequently practiced midwifery, and carry out polishing in raw weld zone, polishing, and carry out laser impact intensified with Nd:YAG laser butt welded seam district, and wash with deionized water Cheongju and put into alcohol ultrasonic degreasing, obtains impeller finished product.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned mode of execution; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (10)
1. a stainless steel drift weldering formula centrifugal pump impeller, comprise front shroud (1), blade (2), back shroud (3) and wheel hub (4), the front-end and back-end of described blade (2) are respectively equipped with front shroud (1) and back shroud (3), described back shroud (3) rear end is provided with wheel hub (4), it is characterized in that, the one side that described front shroud (1) is coupled with blade (2) is provided with the first groove (5), the quantity of described first groove (5) is identical with the quantity of blade (2), the shape of described first groove (5) is identical with the shape that blade (2) presses close to front shroud (1) one end, the one side that described back shroud (3) is coupled with blade (2) is provided with the second groove (6), the quantity of described second groove (6) is identical with the quantity of blade (2), and the shape of described second groove (6) is identical with the shape that blade (2) presses close to back shroud (3) one end.
2. one according to claim 1 stainless steel drift weldering formula centrifugal pump impeller, it is characterized in that, described blade (2) is curved vane or cylinder prismatic blade.
3. one according to claim 1 stainless steel drift weldering formula centrifugal pump impeller, it is characterized in that, the degree of depth of described first groove (5) is 0.5mm-1mm, its width 0.1mm-0.5mm more than the width of blade (2) laminating front shroud (1) one end.
4. one according to claim 3 stainless steel drift weldering formula centrifugal pump impeller, it is characterized in that, the degree of depth of described first groove (5) is 0.5mm, its width 0.1mm more than the width of blade (2) laminating front shroud (1) one end.
5. one according to claim 1 stainless steel drift weldering formula centrifugal pump impeller, it is characterized in that, described second groove (6) degree of depth is 0.5mm-1mm, its width 0.1mm-0.5mm more than the width of blade (2) laminating back shroud (3) one end.
6. one according to claim 5 stainless steel drift weldering formula centrifugal pump impeller, it is characterized in that, described second groove (6) degree of depth is 0.5mm, its width 0.1mm more than the width of blade (2) laminating back shroud (3) one end.
7. an improvement welding method for stainless steel drift weldering formula centrifugal pump impeller, is characterized in that, comprise the steps:
Steps A: each parameter of Negotiation speed Y-factor method Y determination impeller, comprises vane inlet width b
1, blade exit width b
2, inlet blade angle laying angle β
1a, β
1b, β
1c, blade outlet angle laying angle β
2, subtended angle of blade ψ, vane thickness S
1, number of blade Z, front shroud internal diameter D
1, front shroud outer diameter D
2, front shroud thickness S
2, back shroud diameter D
3, back shroud thickness S
3, hub diameter d and hub thickness S
4; In CAD, described impeller pattern is set up with this;
Step B: according to impeller pattern described in steps A obtain respectively front shroud model and leaf model fit hold, shape that back shroud model and leaf model fit the space curve held;
Step C: stamp out initial blade according to impeller pattern described in steps A, the working surface of initial blade and the back side are through polishing, polishing, laser impact intensified; Afterwards with deionized water Cheongju wash, alcohol ultrasonic degreasing, obtain blade (2);
Step D: the shape of the space curve held of fitting according to the model of front shroud described in step B and leaf model, described front shroud (1) with the plane that blade (2) is coupled stamps out first groove (5) identical with blade (2) quantity; First groove (5) degree of depth is 0.5-1mm, its width 0.1mm-0.5mm more than the width of blade (2) laminating front shroud (1) one end; Same, to fit according to back shroud model in step B and leaf model the shape of the space curve held, described back shroud (3) is stamped out the second groove (6), the degree of depth of the second groove (6) is 0.5-1mm, its width 0.1mm-0.5mm more than the width of blade (2) laminating back shroud (3) one end;
Step e: the two ends of blade (2) are embedded respectively front shroud (1) and back shroud (3) and fixing relative position, first by blade (2) and back shroud (3) laser bonding, weld blade (2) and front shroud (1) again, finally by wheel hub (4) and weldment weld; Butt welding subsequently practices midwifery to carry out polishing in raw weld zone, polishing, laser impact intensified, after through going to wash from sub-water Cheongju, alcohol ultrasonic degreasing, obtain impeller finished product.
8. the improvement welding method of a kind of stainless steel drift weldering formula centrifugal pump impeller according to claim 7, it is characterized in that, laser impact intensified equipment therefor described in step C is Nd:YAG laser.
9. the improvement welding method of a kind of stainless steel drift weldering formula centrifugal pump impeller according to claim 7, it is characterized in that, the equipment therefor of laser bonding described in step e is YLS-4000 optical fibre laser.
10. the improvement welding method of a kind of stainless steel drift weldering formula centrifugal pump impeller according to claim 7, it is characterized in that, in steps A, each parameter of impeller is as follows: vane inlet width b
1=35mm, blade exit width b
2=24mm, vane inlet laying angle β
1a=20 °, β
1b=25 °, β
1c=30 ° of blade exit laying angle β
2=27 °, subtended angle of blade ψ=130 °, vane thickness S
1=3mm, number of blade Z=6, front shroud internal diameter D
1=150mm, front shroud outer diameter D
2=300mm, front shroud thickness S
2=3mm, back shroud diameter D
3=300mm, back shroud thickness S
3=3mm, hub diameter d=80mm and hub thickness S
4=6mm.
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| CN201510246139.9A CN104879316B (en) | 2015-05-14 | 2015-05-14 | A kind of stainless steel rushes weldering formula centrifugal pump impeller and its improves welding method |
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|---|---|---|---|
| CN201510246139.9A CN104879316B (en) | 2015-05-14 | 2015-05-14 | A kind of stainless steel rushes weldering formula centrifugal pump impeller and its improves welding method |
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| CN107355418A (en) * | 2017-09-01 | 2017-11-17 | 海城三鱼泵业有限公司 | A kind of low-specific-speed stainless steel punching stretch welded-type impeller and its technique |
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| CN113931874A (en) * | 2021-10-12 | 2022-01-14 | 广州市凯卫莎环保科技有限公司 | Impeller and processing method thereof and high-temperature centrifugal fan applying impeller |
| CN114810623A (en) * | 2022-04-16 | 2022-07-29 | 江苏大学流体机械温岭研究院 | Vane pump health monitoring and evaluating method and device based on Mahalanobis distance |
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| CN106181270A (en) * | 2016-08-26 | 2016-12-07 | 常州索拉尔熔盐泵阀科技有限公司 | The preparation method of pump for liquid salts combination type blade wheel |
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| CN107355418A (en) * | 2017-09-01 | 2017-11-17 | 海城三鱼泵业有限公司 | A kind of low-specific-speed stainless steel punching stretch welded-type impeller and its technique |
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| CN108869400A (en) * | 2018-08-24 | 2018-11-23 | 浙江南元泵业有限公司 | Centrifugal pump guide vane |
| CN108895033A (en) * | 2018-08-24 | 2018-11-27 | 浙江南元泵业有限公司 | The intracorporal guide vane mechanism of blower inlet casing |
| CN113931874A (en) * | 2021-10-12 | 2022-01-14 | 广州市凯卫莎环保科技有限公司 | Impeller and processing method thereof and high-temperature centrifugal fan applying impeller |
| CN114810623A (en) * | 2022-04-16 | 2022-07-29 | 江苏大学流体机械温岭研究院 | Vane pump health monitoring and evaluating method and device based on Mahalanobis distance |
| CN114810623B (en) * | 2022-04-16 | 2023-09-22 | 江苏大学流体机械温岭研究院 | Marsh distance-based vane pump health monitoring and evaluating method and device |
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Application publication date: 20150902 Assignee: Jiangsu is a pump industry science and technology Group Co., Ltd forever Assignor: Jiangsu University Contract record no.: 2019320000078 Denomination of invention: Stainless steel pulse-welded centrifugal pump impeller and improved welding method thereof Granted publication date: 20180424 License type: Exclusive License Record date: 20190322 |