CN209761848U - Composite impeller of multistage pump - Google Patents
Composite impeller of multistage pump Download PDFInfo
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- CN209761848U CN209761848U CN201920653421.2U CN201920653421U CN209761848U CN 209761848 U CN209761848 U CN 209761848U CN 201920653421 U CN201920653421 U CN 201920653421U CN 209761848 U CN209761848 U CN 209761848U
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Abstract
The utility model discloses a compound impeller of multistage pump, include long blade, two short blades and front and back apron and constitute. The flow separation of the surfaces of the blades under the working condition of large flow is controlled by arranging the long and short blades between the two blades, the principle is that large axial vortexes exist on the surface of the centrifugal impeller under the working condition of large flow, so that the external characteristics of the multistage pump are rapidly reduced, the axial vortexes can be eliminated by arranging the short blades, the lift and the efficiency are improved, and the multistage centrifugal impeller can be used in the field of energy conservation and emission reduction.
Description
Technical Field
The utility model relates to a multistage pump is with high-efficient composite impeller refers in particular to a structure that adopts long and short blade to control impeller surface axial swirl, specifically designs to the low specific speed impeller cylinder blade of a low discharge high lift.
Background
The water pump is widely applied to various fields of industrial and agricultural production and resident life, and the electric energy consumed by the water pump unit accounts for more than 21% of the total national electricity consumption every year. The multistage pump is one of centrifugal pumps, and the centrifugal force is obtained by the rotation of an impeller, and the multistage pump can be used in many industrial departments such as petroleum, chemical engineering, machinery, mines, light industry, medicine, food and the like. In many processes of industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regaining, vacuum degassing and the like, multistage pumps are widely used. It can pump out inflammable and explosive gas, and also can pump out gas containing dust and water.
The water pump impeller can be divided into a single-suction type impeller and a double-suction type impeller, the single-suction type impeller absorbs water on a single side, and the small-flow water pump impeller is mostly in the form of the single-suction type impeller and the double-suction type impeller. The double-suction impeller absorbs water at two sides, and the high-flow water pump impeller adopts the double-suction impeller. Under certain conditions, if the impeller is not well designed, water loss and clearance loss occur at the pump inlet and blades.
The impeller of the centrifugal pump type water pump mainly has the following 3 types, namely a closed type impeller, a front half-open type impeller and a full-open type impeller. Closed impeller: consists of blades, a front cover plate and a rear cover plate. The efficiency of the closed impeller is high and the manufacturing difficulty is high. Most applications are in centrifugal pumps. Is suitable for conveying clean liquid without particles, such as clear water, solution and the like. Semi-open impeller: generally, there are two kinds of structures one of which is preceding semi-open type, comprises back shroud and blade, and this structure impeller efficiency is lower, and another kind of sealing ring that need to adapt adjustable clearance for raising the efficiency is latter semi-open type, comprises front shroud and blade, owing to can use the sealing ring the same with closed water pump impeller, efficiency and closed impeller are the same basically, and the blade still has except carrying liquid: the sealing function of the back vane or sub-impeller. The semi-open impeller is adapted to transport liquids containing suspensions of solid particles, fibres and the like. The semi-open impeller has the advantages of low manufacturing difficulty, low cost and strong adaptability, is gradually applied to centrifugal pumps for oil refining and chemical industry in recent years, and is used for conveying clear water and liquid similar to the clear water. Open impeller: only has blades and blade reinforcing ribs and has no front and back cover plates. The number of the open impeller blades is less than 2-5. The water pump impeller has low efficiency and less application, and is mainly used for conveying liquid with high viscosity and slurry liquid.
Therefore, under the condition of ensuring the basic design requirements of the flow lift and the like of the multi-stage pump, the improvement of the pump efficiency has practical significance for the energy conservation and emission reduction of the pump.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming of existence, the utility model discloses an inventor is through long-term exploration attempt and many times experiment and effort, constantly reform transform and innovate, provides a composite impeller for multistage pump to restrain axial swirl under the large-traffic operating mode of this kind of vane type multistage pump, the outer characteristic of elevator pump.
In order to realize the purpose, the utility model adopts the technical scheme that: the utility model provides a compound impeller of multistage pump, its includes long blade, short blade an, short blade b, front shroud, back shroud and impeller, and front shroud and back shroud assembly are on the impeller, the both ends of long blade are connected with impeller inlet limit and impeller export limit respectively, are provided with short blade an and short blade b between two adjacent long blades, short blade an and short blade b are connected with impeller export limit.
According to the utility model discloses in a compound impeller of multistage pump, its further preferred technical scheme be long blade be cylindrical blade, the head radius, thickness increases gradually.
According to the utility model discloses in a compound impeller of multistage pump, its further preferred technical scheme be short blade a head radius R2mm, be close to the working face of long blade.
According to the utility model discloses in a compound impeller of multistage pump, its further preferred technical scheme be short blade b head radius R2mm, be close to the working face of long blade.
According to the utility model discloses in a compound impeller of multistage pump, its further preferred technical scheme be long blade, short blade a and short blade b the blade number equal, the blade number is less when the rotational speed is big, the blade number is many when the rotational speed is little, the blade number is 4 or 5 or 6.
According to the present invention, it is further preferable that the chord length of the short blades a and the short blades b is one third or one fourth of the chord length of the long blades.
According to the utility model discloses in a compound impeller of multistage pump, its further preferred technical scheme be short blade a and short blade b thickness unanimous.
The utility model has the advantages that: the two short blades are adopted to control the flow separation of the large flow, the effect is obvious compared with the effect of adopting one short blade, the scheme is beneficial under the condition of not increasing the manufacturing cost, and the improvement on the efficiency of the lifting pump under the working condition of small flow and the related working condition is also beneficial.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic top view of a composite impeller for a multistage pump.
Fig. 2 is a schematic axial projection structure.
In the figure, 1, a long blade, 2, a short blade a, 3, a short blade b, 4, an impeller inlet edge, 5, an impeller outlet edge, 6, an impeller inlet diameter D 1, 7, a short blade a inlet diameter D 3, 8, a short blade b inlet diameter D 4, 9, an impeller outlet diameter D 2, 10, a front cover plate, 11, a rear cover plate and 12 impellers are arranged.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.
Examples
As shown in fig. 1 and 2: the utility model provides a composite impeller for multistage pump, include long blade 1, short blade a2, short blade b3, front shroud 10, back shroud 11. The front cover plate 10 and the rear cover plate 11 are assembled on the impeller 12, two ends of each long blade 1 are respectively connected with the impeller inlet edge 4 and the impeller outlet edge 5, a short blade a2 and a short blade b3 are arranged between two adjacent long blades 1, and the short blade a2 and the short blade b3 are connected with the impeller outlet edge 5. The long blade 1 is a cylindrical blade, the head of the long blade is rounded, and the thickness of the long blade is gradually increased. The head of the short blade a2 is rounded R2mm and is close to the working surface of the long blade 1. The head of the short blade b3 is rounded R2mm and is close to the working surface of the long blade 2. The long blade 1, the short blade a2 and the short blade b3 have the same number of blades, are smaller than when the rotation speed is high, and are larger than when the rotation speed is low, and the number of blades is generally 4, 5 or 6.
The chord length of the short blade a2 and the chord length of the short blade b3 are one third or one fourth of that of the long blade 1, the thickness of the short blade a2 is consistent with that of the short blade b3, the inlet diameter D 3 7 of the base circle of the head of the short blade a2 is two thirds of the outlet diameter D 2 9 of the impeller, and the inlet diameter D 4 8 of the base circle of the head of the short blade b3 is three quarters of the outlet diameter D 2 9 of the impeller.
The anti-cavitation impeller operates in a mode of anticlockwise rotation, as shown by an arrow in fig. 1, liquid enters an inlet edge 4 of the impeller 12 and reaches an outlet edge 5 of the impeller 12 under the action of centrifugal force, and the impeller does work.
The flow separation of the surfaces of the blades under the working condition of large flow is controlled by arranging the long and short blades between the two blades, the principle is that large axial vortexes exist on the surface of the centrifugal impeller under the working condition of large flow, so that the external characteristics of the multistage pump are rapidly reduced, the axial vortexes can be eliminated by arranging the short blades, the lift and the efficiency are improved, and the multistage centrifugal impeller can be used in the field of energy conservation and emission reduction.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (7)
1. The utility model provides a compound impeller of multistage pump which characterized in that includes long blade, short blade an, short blade b, front shroud, back shroud and impeller, and front shroud and back shroud assembly are on the impeller, the both ends of long blade are connected with impeller inlet limit and impeller export limit respectively, are provided with short blade an and short blade b between two adjacent long blades, short blade an and short blade b are connected with impeller export limit.
2. A multi-stage pump composite impeller according to claim 1, wherein: the long blade is a cylindrical blade, the head of the long blade is rounded, and the thickness of the long blade is gradually increased.
3. A multi-stage pump composite impeller according to claim 1, wherein: the head of the short blade a is rounded R2mm and is close to the working surface of the long blade.
4. A multi-stage pump composite impeller according to claim 1, wherein: the head of the short blade b is rounded R2mm and is close to the working surface of the long blade.
5. A multi-stage pump composite impeller according to claim 1, wherein: the number of the long blades, the short blades a and the short blades b is equal, the number of the blades is less than that when the rotating speed is high, the number of the blades is more than that when the rotating speed is low, and the number of the blades is 4, 5 or 6.
6. A multi-stage pump composite impeller according to claim 1, wherein: the chord length of the short blade a and the short blade b is one third or one fourth of that of the long blade.
7. A multi-stage pump composite impeller according to claim 1, wherein: the thickness of the short blade a is consistent with that of the short blade b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920653421.2U CN209761848U (en) | 2019-05-07 | 2019-05-07 | Composite impeller of multistage pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920653421.2U CN209761848U (en) | 2019-05-07 | 2019-05-07 | Composite impeller of multistage pump |
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| CN209761848U true CN209761848U (en) | 2019-12-10 |
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| CN201920653421.2U Active CN209761848U (en) | 2019-05-07 | 2019-05-07 | Composite impeller of multistage pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129261A1 (en) * | 2019-12-26 | 2021-07-01 | 浙江理工大学 | Blade load distribution-based method for designing centrifugal-pump compound impeller |
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2019
- 2019-05-07 CN CN201920653421.2U patent/CN209761848U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129261A1 (en) * | 2019-12-26 | 2021-07-01 | 浙江理工大学 | Blade load distribution-based method for designing centrifugal-pump compound impeller |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 410000, No. 1061, East Ring Road, Furong district, Hunan, Changsha Patentee after: Changsha Zhonglian Pump Co.,Ltd. Address before: 410000, No. 1061, East Ring Road, Furong district, Hunan, Changsha Patentee before: CHANGSHA ZOOMLIC-PUMP Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |