CN106122084B - A kind of low specific speed impeller structure and its processing method - Google Patents
A kind of low specific speed impeller structure and its processing method Download PDFInfo
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- CN106122084B CN106122084B CN201610745190.9A CN201610745190A CN106122084B CN 106122084 B CN106122084 B CN 106122084B CN 201610745190 A CN201610745190 A CN 201610745190A CN 106122084 B CN106122084 B CN 106122084B
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- blade
- body portion
- root
- impeller
- sealing ring
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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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
- F04D29/2233—Construction and assembly entirely open or stamped from one sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of low specific speed impeller structure and its processing method, which includes impeller body portion and blade root；The impeller body portion includes front shroud, blade body portion and back shroud, the blade root includes wheel hub, root of blade and sealing ring portion, the middle part of the back shroud is protruded backward forms sleeve, back shroud is set in the rear portion of wheel hub by the casing, the front shroud is set in sealing ring portion, and circular weld is formed between sealing ring portion, which passes through together with circular weld sealing welding with sealing ring portion；Its processing method includes: 1) to distinguish casting impeller body portion and blade root；2) blade root is inserted in from the rear end of blade root in impeller body portion, front shroud is inserted in sealing ring portion；3) by the circular weld sealing welding between front shroud and sealing ring portion.Difficulty of processing of the present invention is low, and machining accuracy is high, and total quality is more preferable, to improve the yield rate of processing；And the stability of impeller is high, can effectively improve water conservancy diversion efficiency.
Description
Technical field
The present invention relates to centrifugal pump impeller manufacturing field more particularly to a kind of ultra-low specific speed blade wheel structure and its processing sides
Method.
Background technique
With energy-saving and environmental protection, the raising of safety requirements, the centrifugal pump of low-specific-speed is using more and more, and for impeller
When specific speed is lower than 35, impeller as shown in Figure 1, when D2(impeller outer diameter) with b2(runner exit width) ratio greater than 30 when,
The present foundry engieering of this kind of double shrouded wheel it is difficult to ensure that runner dimensional accuracy and surface smoothness, scrappage is very high by (one
As be only capable of reaching 20% or so qualification rate), or even can not cast, limit the further development of super-low specific speed centrifugal pump.
Currently, manufacturing this kind of impeller, referring to Fig. 1, general use individually processes front shroud, the blade and rear cover of impeller
Plate, wheel hub cast (or processing) molding together, then weld front shroud and back shroud as integral wheel, this molding
The method of impeller has weld seam between front shroud and blade, and weld seam is extremely small, their bond strength is low；Especially work as leaf
When being relatively large in diameter (i.e. the value of D2/b2 is greater than 30) of wheel, the intermediate position of blade and front shroud can not weld at all, whole at this time
The intensity of impeller is lower, and the weld bead height for welding impeller is unable to accurately control, and cannot reach the requirement of the Hydraulic Design size, can not
Guarantee that the hydraulic performance of impeller is realized；Also, there are gaps between blade and front shroud, influence on impeller hydraulic performance huge.Together
When welding impeller can not be solved in special material (dual phase steel, non-ferrous metal etc.) welding technique, the heat affected area leaf of welding is to gold
The corrosivity decline of category is very big, not can guarantee the long-time service of impeller, brings hidden danger to equipment safety operation.
Summary of the invention
In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a kind of ultra-low specific speed blade wheel structures
And its processing method, difficulty of processing is low, and machining accuracy is high, and total quality is more preferable, to improve the yield rate of processing；And
And the stability of impeller is high, can effectively improve water conservancy diversion efficiency.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that such: a kind of low specific speed impeller knot
Structure, it is characterised in that: including impeller body portion and blade root；The impeller body portion includes front shroud, blade body portion and rear cover
Plate, and the front shroud, blade body portion and back shroud are molded as one；The blade root include wheel hub, root of blade with
And sealing ring portion, the root of blade are located at the front of wheel hub, the sealing ring portion is set on the outside of root of blade, and wheel hub,
Root of blade and sealing ring portion are integrally formed；
The middle part of the back shroud is protruded backward forms sleeve, and back shroud is set in the rear portion of wheel hub by the casing,
And together with wheel hub interference fit, and back shroud is close to wheel hub front；Meanwhile the outer end of root of blade can be with blade body
The inner end in portion fits closely；The front shroud is set in sealing ring portion, and forms circular weld between sealing ring portion, before this
Cover board passes through together with circular weld sealing welding with sealing ring portion.
Further, the blade root and the segmentation principle in impeller body portion are: root of blade is segmental arc, blade body portion
For straightway；The diameter of the inner hole of front shroud is consistent with diameter of a circle where the inner end in blade body portion, the diameter of bore of back shroud
Less than diameter of a circle where the inner end in blade body portion.
Further, front shroud inner hole is tapered, is greater than close to front shroud outside diameter close to front shroud inside diameter.
A kind of processing method of above-mentioned low specific speed impeller structure, characterized by the following steps:
1) it is required according to the Hydraulic Design, respectively casting impeller body portion and blade root；
2) by the casing in impeller body portion, blade root is inserted in from the rear end of blade root in impeller body portion, and make leaf
Sheet body portion and root of blade face, and blade body portion inner end is close together with root of blade outer end, meanwhile, make impeller body portion
Back shroud is close to the front of blade root, and front shroud is inserted in sealing ring portion；
3) by the circular weld sealing welding between front shroud and sealing ring portion.
Compared with prior art, the present invention has the advantage that
1, the ultra-low specific speed impeller of extremely difficult casting is cut into two components to cast respectively, substantially reduces impeller
Difficulty is cast, the rejection rate of blank is substantially reduced.
2, the impeller body portion cast respectively, blade body portion therein is substantially Cylindrical Blade, and molding difficulty is low, runner and leaf
The molded line dimensional accuracy in sheet body portion is easy to guarantee, runner and the size of blade body portion molded line is made more to meet design requirement.
3, blade root belongs to impeller channel turning and leaf curling part, this structure have shortened molding runners and blade root
The length in portion, while keeping the sand bond for forming runner when casting good, it is easy molding, root of blade line style and channel size more hold
Easily reach design requirement.
4, impeller is separated from the runner turning site for being easiest to occur defect, form two individual components and added respectively
Work reduces the casting difficulty of runner, overcomes the factor for defect occur, greatly improves the yield rate of impeller.
5, the flow channel length of impeller body portion and blade root all shortens significantly, can reduce leaf using the method for manual polishing
Runner surface roughness is taken turns, it is extremely advantageous to the finish for improving runner and blade surface, it reduces fluid high-speed and flows through blade
The friction loss on surface effectively improves the efficiency of impeller.
6, the front shroud circular weld forming of impeller, substantially reduces the difficulty of volume flaw detection, the matter of impeller can be effectively ensured
Amount reduces and pumps accident risk caused by Impeller Mass, improves pump operation reliability.
7, using the technology, impeller that can be very big with the value of the ratio between casting impeller outer diameter and runner exit width, for centrifugation
It pumps and develops the protection in terms of developing skill to ultra-low specific speed direction.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing impeller.
Fig. 2 is structural schematic diagram of the invention.
Fig. 3 be Fig. 2 along A-A to cross-sectional view.
Fig. 4 is the structural schematic diagram in impeller body portion.
Fig. 5 be Fig. 4 along B-B to cross-sectional view.
Fig. 6 is the structural schematic diagram of blade root.
Fig. 7 be Fig. 6 along C-C to cross-sectional view.
In Fig. 2-Fig. 4: 1-front shroud, 2-blade body portions, 3-back shrouds, 4-wheel hubs, 5-roots of blade, 6-is close
Seal ring portion, 7-casings.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment: referring to fig. 2-Fig. 7, a kind of low specific speed impeller structure, including impeller body portion and blade root.It is described
Impeller body portion includes front shroud 1, blade body portion 2 and back shroud 3, and the front shroud 1, blade body portion 2 and back shroud 3 at
Type is integrated.The blade root includes that wheel hub 4, root of blade 5 and sealing ring portion 6, the root of blade 5 are located at wheel hub 4
Front, the sealing ring portion 6 is set in the outside of root of blade 5, and wheel hub 4, root of blade 5 and 6 one of sealing ring portion at
Type.The blade root and the segmentation principle in impeller body portion are: root of blade 5 is segmental arc, and blade body portion 2 is straightway；Before
The diameter of the inner hole of cover board 1 is consistent with diameter of a circle where the inner end in blade body portion 2, and the diameter of bore of back shroud 3 is less than blade
Diameter of a circle where the inner end in body portion 2.
The middle part of the back shroud 3 is protruded backward forms sleeve 7, and back shroud 3 is set in wheel hub 4 by the casing 7
Rear portion, and together with the interference fit of wheel hub 4, and back shroud 3 is close to 4 front of wheel hub.Meanwhile the outer end energy of root of blade 5
Enough inner ends with blade body portion 2 fit closely, and form the vane type line of design, and the torque of axis passes to impeller hub 4 by key,
The casing 7 in impeller body portion and the interference fit at 4 rear portion of wheel hub transmit torque.The front shroud 1 is set in sealing ring portion 6, and
Circular weld is formed between sealing ring portion 6, which passes through together with circular weld sealing welding with sealing ring portion 6.Its
In, 1 inner hole of front shroud is tapered, is greater than close to 1 outside diameter of front shroud close to 1 inside diameter of front shroud (that is: front shroud 1
The contour line of inner hole notch and the axial line of impeller are at 0 °~60 ° angles)；To keep weld seam wedge shaped, it is more convenient for welding.
Impeller body portion and blade root distinguish casting and forming and can be shortened molten iron in forming process from the angle of casting and forming
Flow distance, reduce the molding difficulty of impeller, guarantee that impeller channel size and the vane size more meet with design value, can
Effectively improve the efficiency of impeller water conservancy diversion.It is formed by split casting, is combined into the impeller for meeting design requirement, leaf after then processing
Gap is not present between the front shroud 1 and blade of wheel, accuracy is high.Blade is divided to two sections of castings, and front shroud 1 and sealing ring portion 6 use ring
Weld seam welding is integral；It can more preferably control welding quality and the quality for being readily inspected weld seam, the cover board better quality of impeller stress,
To improve the yield rate of impeller；Meanwhile the torque of axis passes to impeller body by the wheel hub 4 of the blade root of monoblock cast
Portion, stability is high in impeller operational process.
A kind of processing method of above-mentioned low specific speed impeller structure, characterized by the following steps:
1) it is required according to hydraulic engineering design, respectively casting impeller body portion and blade root；And to runner and blade (blade body portion
2 and root of blade 5) surface polishes.Wherein, root of blade 5 is segmental arc, and blade body portion 2 is straightway；Front shroud 1
The diameter of inner hole is consistent with diameter of a circle where the inner end in blade body portion 2, and the diameter of bore of back shroud 3 is less than blade body portion 2
Diameter of a circle where inner end, and protrusion forms casing 7 backward at back shroud 3 middle part.
2) by the casing 7 in impeller body portion, blade root is inserted in from the rear end of blade root in impeller body portion, and make leaf
Sheet body portion 2 and 5 face of root of blade, and 2 inner end of blade body portion is close together with 5 outer end of root of blade, meanwhile, make impeller body
The back shroud 3 in portion is close to the front of blade root, and front shroud 1 is inserted in sealing ring portion 6.
3) by the circular weld sealing welding between front shroud 1 and sealing ring portion 6, a complete impeller is formed.
Finally, it should be noted that technical side the above examples are only used to illustrate the technical scheme of the present invention and are not limiting
Case, those skilled in the art should understand that, modification or equivalent replacement of the technical solution of the present invention are made for those, and
The objective and range for not departing from the technical program, are intended to be within the scope of the claims of the invention.
Claims (2)
1. a kind of low specific speed impeller structure, it is characterised in that: including impeller body portion and blade root；The impeller body portion includes
Front shroud, blade body portion and back shroud, and the front shroud, blade body portion and back shroud are molded as one；The impeller
Root includes that wheel hub, root of blade and sealing ring portion, the root of blade are located at the front of wheel hub, and the sealing ring portion is arranged
On the outside of root of blade, and wheel hub, root of blade and sealing ring portion are integrally formed；Front shroud inner hole is tapered, by nearby
Cover board outside diameter is greater than close to front shroud inside diameter；The root of blade is segmental arc, and blade body portion is straightway；Front cover
The diameter of the inner hole of plate is consistent with diameter of a circle where the inner end in blade body portion, and the diameter of bore of back shroud is less than blade body portion
Diameter of a circle where inner end；
The middle part of the back shroud is protruded backward forms sleeve, and back shroud is set in the rear portion of wheel hub by the casing, and with
Wheel hub is interference fitted together, and back shroud is close to wheel hub front；Meanwhile the outer end of root of blade can be with blade body portion
Inner end fits closely；The front shroud is set in sealing ring portion, and forms circular weld between sealing ring portion, the front shroud
Pass through together with circular weld sealing welding with sealing ring portion.
2. a kind of processing method of low specific speed impeller structure as described in claim 1, it is characterised in that: including walking as follows
It is rapid:
1) it is required according to hydraulic engineering design, respectively casting impeller body portion and blade root；
2) by the casing in impeller body portion, blade root is inserted in from the rear end of blade root in impeller body portion, and make blade body
Portion and root of blade face, and blade body portion inner end is close together with root of blade outer end, meanwhile, make the rear cover in impeller body portion
Plate is close to the front of blade root, and front shroud is inserted in sealing ring portion；
3) by the circular weld sealing welding between front shroud and sealing ring portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745190.9A CN106122084B (en) | 2016-08-29 | 2016-08-29 | A kind of low specific speed impeller structure and its processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745190.9A CN106122084B (en) | 2016-08-29 | 2016-08-29 | A kind of low specific speed impeller structure and its processing method |
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| Publication Number | Publication Date |
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| CN106122084A CN106122084A (en) | 2016-11-16 |
| CN106122084B true CN106122084B (en) | 2019-04-23 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108561327B (en) * | 2018-04-09 | 2021-03-19 | 张家港市海工船舶机械制造有限公司 | Method for manufacturing closed impeller |
| CN115195150A (en) * | 2019-09-25 | 2022-10-18 | 协磁股份有限公司 | Method for manufacturing three-dimensional plastic impeller of centrifugal pump and structure thereof |
| CN111673385A (en) * | 2020-06-15 | 2020-09-18 | 阳信东泰精密金属有限公司 | Production method of closed impeller |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069501U (en) * | 1990-04-29 | 1991-01-16 | 重庆钢都机修厂 | Vane wheel for big centrifugal blower |
| CN2308742Y (en) * | 1997-07-21 | 1999-02-24 | 沈阳市中兴钛制设备厂 | Ti welded centrifugal pump |
| FR2830579B1 (en) * | 2001-10-05 | 2004-01-23 | Abb Solyvent Ventec | CENTRIFUGAL COMPRESSION WHEEL COMBINING A COMPOSITE MATERIAL STRUCTURE AND A METAL STRUCTURE AND MANUFACTURING METHOD |
| CN201582191U (en) * | 2009-12-01 | 2010-09-15 | 上海连成（集团）有限公司 | Novel structure of low-specific speed impeller |
| JP5606358B2 (en) * | 2011-02-24 | 2014-10-15 | 三菱重工業株式会社 | Impeller, rotor provided with the same, and method for manufacturing impeller |
| CN205918638U (en) * | 2016-08-29 | 2017-02-01 | 重庆水泵厂有限责任公司 | Low specific speed impeller structure |
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