CN113586514A - Impeller structure of integral type series connection and multistage centrifugal pump thereof - Google Patents
Impeller structure of integral type series connection and multistage centrifugal pump thereof Download PDFInfo
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- CN113586514A CN113586514A CN202111072689.5A CN202111072689A CN113586514A CN 113586514 A CN113586514 A CN 113586514A CN 202111072689 A CN202111072689 A CN 202111072689A CN 113586514 A CN113586514 A CN 113586514A
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- Prior art keywords
- impeller
- centrifugal pump
- multistage centrifugal
- communicated
- medium
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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
- F04D29/2216—Shape, geometry
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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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
- F04D29/185—Rotors consisting of a plurality of wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an integrated impeller structure connected in series and a multistage centrifugal pump thereof, which are arranged in the multistage centrifugal pump and comprise an impeller body; the impeller body is provided with a plurality of stages of sequentially-communicated impellers, and two adjacent impellers are spaced by a cover plate; the medium inlet end of the impeller body is communicated with the liquid suction chamber of the multistage centrifugal pump, and the medium outlet end of the impeller body is communicated with the water outlet of the multistage centrifugal pump; the medium inlet end of the impeller body is also communicated with the impeller of the first stage. The invention solves the problems of rapid wear of the overflowing part of the wear-resistant pump and short service life of the pump.
Description
Technical Field
The invention relates to a cantilever type centrifugal pump technology, in particular to an integrated series impeller structure and a multistage centrifugal pump thereof.
Background
The centrifugal pump is designed according to the centrifugal force principle, and the impeller blades rotating at a high speed drive the medium to rotate, so that the medium is thrown out, and the purpose of conveying is achieved. The cantilever type centrifugal pump has large consumption in petroleum refining and chemical industry markets, accounts for more than 70% of total pump capacity, the lift of the existing cantilever type centrifugal pump does not exceed 200 meters, and a multistage centrifugal pump is selected when the lift exceeds 200 meters, especially under the working condition of medium and small flow demand, several to dozens of cubes are selected, the lift is 200-400 meters, and under the working condition, only the multistage pump can be selected.
Referring to fig. 1, the conventional impeller 10 is composed of a hub 11, blades 12 and a cover plate, the cover plate of the impeller of the submerged pump is divided into a front cover plate 14 and a rear cover plate 13, the cover plate on the inlet side of the impeller is called the front cover plate 14, and the cover plate on the other side of the impeller is called the rear cover plate 13. The existing multistage centrifugal pump is applied to certain applications containing more solid particles, and the solid particles seriously scour an impeller outlet, a guide vane inlet or a volute throat due to high flow velocity of the impeller outlet, so that the service life of parts is short, and the maintenance is frequent. In addition, for the centrifugal pump impeller with low specific speed, the disc friction loss of the cover plate is large, and the efficiency is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an integrated impeller structure in series connection and a multistage centrifugal pump thereof, and solves the problems of rapid wear of the flow-through parts of the wear-resistant pump and short service life of the pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an integrated impeller structure connected in series, which is arranged in a multistage centrifugal pump and comprises an impeller body;
the impeller body is provided with a plurality of stages of sequentially-communicated impellers, and two adjacent impellers are spaced by a cover plate;
the medium inlet end of the impeller body is communicated with the liquid suction chamber of the multistage centrifugal pump, and the medium outlet end of the impeller body is communicated with the water outlet of the multistage centrifugal pump;
the medium inlet end of the impeller body is also communicated with the impeller of the first stage.
Preferably, the impeller is provided with more than two stages.
Preferably, two adjacent impellers are communicated through a flow channel.
Preferably, two adjacent flow passages are separated by a guide vane.
Preferably, an outer diameter of the impeller between the medium inflow side and the medium outflow side is configured to be gradually smaller.
In a second aspect, the invention provides a multistage centrifugal pump comprising the integrated tandem impeller structure.
The invention provides an integrated series impeller structure and a multistage centrifugal pump thereof, which have the following beneficial effects:
1) the existing multi-stage impeller structure is changed into an integrated series impeller structure, so that the impeller structure is more compact;
2) the specific speed of the centrifugal pump can be improved, the friction loss of the disc is reduced, and the working efficiency of the centrifugal pump is improved;
3) the axial force can be balanced, and the power loss caused by using balance holes or back blades is avoided.
Drawings
FIG. 1 is a schematic view of a prior art impeller;
FIG. 2 is a schematic structural view of the impeller structure of the present invention;
FIG. 3 is a schematic diagram of the path of liquid through the impeller of the present invention;
FIG. 4 is a schematic view of the pressure distribution of the impeller structure of the present invention;
fig. 5 is a schematic view of the multistage centrifugal pump of the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
Referring to fig. 2 and 3, the present invention provides an integrated impeller structure connected in series, which is disposed inside a multistage centrifugal pump and includes an impeller body 100.
The impeller body 100 is provided with a plurality of stages of sequentially communicated and integrated impellers 1, and the adjacent two impellers 1 are separated by a cover plate 2, namely, a rear cover plate of a rear-stage impeller is shared with a front cover plate of a front-stage impeller.
The medium inlet end 101 of the impeller body 100 is communicated with the liquid suction chamber 201 of the multistage centrifugal pump 200, and the medium outlet end 102 of the impeller body 100 is communicated with the water outlet 202 of the multistage centrifugal pump 200.
The media inlet port 101 of the impeller body 100 also communicates with the first stage impeller 1.
Two adjacent impellers 1 are communicated through the flow channels 3, the two adjacent flow channels 3 are separated by the guide vane 4, a medium enters the first-stage impeller 1 from the liquid suction chamber 201, flows out of the first-stage impeller 1, then enters the second-stage impeller 1 through the guide vane 4 and the flow channel 3, and finally flows out of the water outlet 202.
The impeller 1 is provided with more than two stages, but the impeller body 100 is more complicated in structure, the two-stage impeller 1 is usually used for a cantilever centrifugal pump, and compared with the traditional two-stage pump, the structure of the cover plate 2 shared by the two-stage impeller 1 can reduce the cantilever length of a pump shaft, so that the cost is saved, and a rear opening structure can be still adopted, and the maintenance is convenient.
The external diameter between the medium inflow side of the impeller 1 of each stage and the medium outflow side is set to be a gradually-reduced structure, so that the fluid flow speed of the medium outflow side of the impeller 1 is reduced while the lift is ensured, the kinetic energy of solid particles in the fluid is reduced, and the abrasion to the overflowing parts is greatly reduced.
The axial force of the impeller structure of the invention is different from that of the existing impeller, and as shown in the combined figure 4, the stress condition of the impeller structure of the invention is as follows: p0 is the inlet pressure of the pumping chamber 201 of the multistage centrifugal pump 200, P2 is the outlet pressure of the impeller 1 of the first stage, and P3 is the outlet pressure of the impeller 1 of the second stage, the axial force can be changed by adjusting the position of the sealing ring 5, and the purpose of balancing the axial force is achieved.
Referring to fig. 5, the present invention further provides a multistage centrifugal pump, which includes the impeller structure 100 of the present invention, the impeller structure 100 is installed in the pumping chamber 201, the hub 5 thereof is fixed on the main shaft 203, and the impeller structure 100 rotates along with the main shaft 203.
The two adjacent impellers 1 on the impeller structure 100 are communicated through the flow channels 3, the two adjacent flow channels 3 are separated by the guide vanes 4, the medium enters the first-stage impeller 1 from the liquid suction chamber 201, flows out of the first-stage impeller 1, enters the second-stage impeller 1 through the guide vanes 4 and the flow channels 3, and finally flows out of the water outlet 202.
In conclusion, the impeller structure and the multistage centrifugal pump thereof solve the problems of fast abrasion of the overflowing part of the abrasion-resistant pump and short service life of the pump, can improve the specific rotating speed of the multistage centrifugal pump, reduce the friction loss of a disc and improve the efficiency of the pump by using the impellers which are integrally connected in series, can better balance the axial force by reasonable design, and avoid the power loss caused by using balance holes and back blades.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides an impeller structure of integral type series connection locates multistage centrifugal pump's inside, its characterized in that: comprises an impeller body;
the impeller body is provided with a plurality of stages of sequentially-communicated impellers, and two adjacent impellers are spaced by a cover plate;
the medium inlet end of the impeller body is communicated with the liquid suction chamber of the multistage centrifugal pump, and the medium outlet end of the impeller body is communicated with the water outlet of the multistage centrifugal pump;
the medium inlet end of the impeller body is also communicated with the impeller of the first stage.
2. The integrated tandem impeller structure of claim 1, wherein: the impeller is provided with two or more stages.
3. The integrated tandem impeller structure of claim 1, wherein: and the adjacent two impellers are communicated through a flow passage.
4. The integrated tandem impeller structure of claim 3, wherein: and two adjacent flow passages are spaced by guide vanes.
5. The integrated tandem impeller structure of claim 1, wherein: the outer diameter of the impeller between the medium inflow side and the medium outflow side is configured to be gradually reduced.
6. A multistage centrifugal pump characterized by: comprising an integrated tandem impeller structure according to any of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111072689.5A CN113586514A (en) | 2021-09-14 | 2021-09-14 | Impeller structure of integral type series connection and multistage centrifugal pump thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111072689.5A CN113586514A (en) | 2021-09-14 | 2021-09-14 | Impeller structure of integral type series connection and multistage centrifugal pump thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113586514A true CN113586514A (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111072689.5A Pending CN113586514A (en) | 2021-09-14 | 2021-09-14 | Impeller structure of integral type series connection and multistage centrifugal pump thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB272713A (en) * | 1926-08-04 | 1927-06-23 | Drysdale & Co Ltd | Improvements in centrifugal pumps |
| GB747398A (en) * | 1951-12-08 | 1956-04-04 | Von Roll Ag | Improvements in or relating to pumps, blowers, compressors, fluid drives or the like which have impellers |
| CN102996503A (en) * | 2012-12-05 | 2013-03-27 | 中国海洋石油总公司 | Multistage sectional type centrifugal pump with function of balancing axial force by self |
| CN203756551U (en) * | 2013-11-01 | 2014-08-06 | 江苏大学 | Multi-stage self-priming centrifugal pump |
| CN105673555A (en) * | 2016-01-07 | 2016-06-15 | 江苏大学 | Single-suction double-channel impeller and design method thereof |
| CN109356857A (en) * | 2018-11-26 | 2019-02-19 | 潘健 | A kind of superposing type blade wheel structure and the method using blade wheel structure elimination vortex |
-
2021
- 2021-09-14 CN CN202111072689.5A patent/CN113586514A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB272713A (en) * | 1926-08-04 | 1927-06-23 | Drysdale & Co Ltd | Improvements in centrifugal pumps |
| GB747398A (en) * | 1951-12-08 | 1956-04-04 | Von Roll Ag | Improvements in or relating to pumps, blowers, compressors, fluid drives or the like which have impellers |
| CN102996503A (en) * | 2012-12-05 | 2013-03-27 | 中国海洋石油总公司 | Multistage sectional type centrifugal pump with function of balancing axial force by self |
| CN203756551U (en) * | 2013-11-01 | 2014-08-06 | 江苏大学 | Multi-stage self-priming centrifugal pump |
| CN105673555A (en) * | 2016-01-07 | 2016-06-15 | 江苏大学 | Single-suction double-channel impeller and design method thereof |
| CN109356857A (en) * | 2018-11-26 | 2019-02-19 | 潘健 | A kind of superposing type blade wheel structure and the method using blade wheel structure elimination vortex |
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