CN114321000B - Asymmetric double-suction impeller and double-suction centrifugal pump - Google Patents
Asymmetric double-suction impeller and double-suction centrifugal pump Download PDFInfo
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- CN114321000B CN114321000B CN202210061745.3A CN202210061745A CN114321000B CN 114321000 B CN114321000 B CN 114321000B CN 202210061745 A CN202210061745 A CN 202210061745A CN 114321000 B CN114321000 B CN 114321000B
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Abstract
The invention relates to an asymmetric double-suction impeller and a double-suction centrifugal pump, which comprise a hub, wherein two sides of the hub are respectively connected with cover plates at two sides of the hub through a plurality of blades, and a flow channel is formed between the cover plates and the hub; the cover plates at two sides of the hub comprise a first cover plate and a second cover plate, a flow passage formed between the first cover plate and the hub is a first flow passage, and a flow passage formed between the second cover plate and the hub is a second flow passage; the flow area of the first flow channel is larger than that of the second flow channel, and the vertical long-axis pump and the horizontal pump using the double suction impeller. Compared with the traditional conventional double-suction impeller with two cover plates symmetrically arranged to enable the widths of the two flow passages to be equal, the width of the first flow passage and the width of the second flow passage in the asymmetric double-suction impeller are different, so that different flow can be conveyed, cavitation allowance of the asymmetric double-suction impeller is different, and special occasions with different suction conditions on two sides of the double-suction impeller can be met according to specific design requirements.
Description
Technical Field
The invention belongs to the technical field of centrifugal pumps, and particularly relates to an asymmetric double-suction impeller and a double-suction centrifugal pump.
Background
Centrifugal pumps operate by using rotation of an impeller to cause centrifugal movement of water. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to do high-speed rotation movement, the water is centrifugally moved and thrown to the outer edge of the impeller, and the water flows into the water pressing pipeline of the water pump through the runner of the volute pump shell. The impeller is an energy supply device of the centrifugal pump and is a component for directly acting on liquid in the pump; the suction inlet in the center of the pump shell is connected with a suction pipeline, and a one-way bottom valve is arranged at the bottom of the suction pipeline; the exhaust port beside the pump shell is connected with an exhaust pipeline provided with an adjusting valve.
Centrifugal pumps can be classified into single suction type centrifugal pumps and double suction type centrifugal pumps according to the suction mode of the impeller. The front cover plate and the rear cover plate of the single suction impeller are asymmetric, so that the force of the medium fluid pressurized by the impeller on the impeller cover plate is unbalanced, and additional axial force pointing to the suction hole (the direction of the lower water inlet) of the single suction impeller can be generated; therefore, the axial force generated by the impeller is unavoidable in the structure of the single-suction centrifugal pump, so that the working load of the thrust bearing of the pump is increased, and the service life of the bearing is reduced.
CN201377433Y of the prior art provides a vertical long shaft dual suction pump that completely eliminates the additional axial force directed to the suction eye of the impeller. The impeller is subjected to static balance verification, the axial position of the impeller is fixed by the shaft sleeve and the shaft sleeve nuts on two sides, the shaft sleeve nuts can be used for adjusting the axial position of the impeller, the axial force of the impeller is balanced by the symmetrical arrangement of the blades, and possibly, some residual axial force is born by the bearing at the same shaft end.
However, the existing double suction centrifugal pump is not enough to meet the special occasions when the suction performance at two ends of the impeller of the double suction pump is different, for example, a vertical double suction pump is used under the same liquid level, and the liquid level of the upper suction inlet and the lower suction inlet of the impeller of the vertical double suction pump has a height difference and the specific working condition of some horizontal double suction pumps.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide an asymmetric double-suction impeller and a double-suction centrifugal pump, so that the problem that the double-suction pump is unsuitable for being used under the working condition that the suction conditions at two ends are different due to the consistency of suction performances at two ends of the impeller of the double-suction pump is solved, and the effect of stable operation of the double-suction pump under the specific working condition that the suction conditions at two ends are different is achieved.
In order to solve the technical problems, the invention adopts the following technical scheme:
an asymmetric double-suction impeller comprises a hub, wherein two sides of the hub are respectively connected with cover plates at two sides of the hub through a plurality of blades, and a flow channel is formed between each cover plate and the hub; the cover plates at two sides of the hub comprise a first cover plate and a second cover plate, and the first cover plate, the second cover plate and the hub are coaxially arranged; the flow channel formed between the first cover plate and the hub is a first flow channel, and the flow channel formed between the second cover plate and the hub is a second flow channel; the blades comprise front blades and rear blades, the front blades are arranged between the first cover plate and the hub, and the rear blades are arranged between the second cover plate and the hub; the centers of the first cover plate and the second cover plate are respectively provided with a suction inlet, and a water outlet is formed between the inner wall of the outer edge of the first cover plate and the inner wall of the outer edge of the second cover plate; the flow area of the first flow channel is larger than that of the second flow channel.
The technical scheme is further perfected, the number of the front blades corresponds to that of the rear blades, and the arrangement positions in the circumferential direction correspond to each other.
The invention also relates to a double-suction centrifugal pump which is a vertical long-shaft pump and comprises an impeller shaft, a water outlet guide shell and a water inlet section connected below the water outlet guide shell; the asymmetric double-suction impeller is characterized in that the hub is synchronously connected to the impeller shaft in a rotating way and positioned in the water outlet guide shell, the first cover plate is positioned below, the second cover plate is positioned above, the lower part of the water inlet section is provided with a lower liquid inlet, and the water outlet guide shell is provided with an upper liquid inlet; the lower liquid inlet is communicated with the first flow channel, and the upper liquid inlet is communicated with the second flow channel.
The invention also relates to a double-suction centrifugal pump which is a horizontal pump and comprises an impeller shaft, a pump body and a pump cover connected to one end of the pump body; the other end of the pump body is provided with a water inlet end, a water pressing chamber is arranged in the pump body, the water pressing chamber is communicated with the water inlet end through a first cavity in the pump body, and the pump body is also provided with a water outlet end communicated with the water pressing chamber; the asymmetric double-suction impeller is characterized in that the hub is synchronously connected to the impeller shaft in a rotating way and positioned in the pumping chamber, the water outlet is communicated with the water outlet end, the first cover plate faces the water inlet end, and the second cover plate faces the pump cover; the first cover plate is in dynamic sealing connection with the inner wall of the pump body, the second cover plate is in dynamic sealing connection with the inner wall of the pump cover, and a second cavity is formed between the second cover plate and the pump cover; the pump body and the pump cover are also provided with a flow passage which is communicated with the first chamber and the second chamber.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the traditional conventional double-suction impeller with two cover plates symmetrically arranged to enable the widths of the two flow channels to be equal, the asymmetric double-suction impeller provided by the invention has the advantages that the widths of the first flow channel and the second flow channel in the asymmetric double-suction impeller are different, so that different flow rates can be conveyed, and cavitation allowance of the asymmetric double-suction impeller is different, so that specific design requirements are met to meet special occasions with different suction conditions on two sides of the double-suction impeller.
2. When the asymmetric double-suction impeller is used for the vertical long-shaft pump, the problem that the upper side cavitation condition of the traditional conventional double-suction impeller is more serious due to the hydraulic difference of the upper liquid inlet and the lower liquid inlet can be solved; the placement of the double suction impeller is suitable for the situation that hydraulic difference exists between the suction inlets at two ends and the upper liquid inlet and the lower liquid inlet, so that the correction of cavitation allowance is facilitated, and the normal operation of the pump is ensured.
3. When the asymmetric double-suction impeller is used for the horizontal pump, the two different suction performances at the two sides of the asymmetric double-suction impeller can replace a single-stage impeller structure of the single-stage pump, and the pump body is provided with the flow channel so that the two suction inlets of the asymmetric double-suction impeller can be used for sucking fluid, so that the axial force can be balanced better, the pressure in a working chamber can be reduced by changing the suction performance, and the use, flushing and cooling of the mechanical seal can be ensured better.
Drawings
FIG. 1 is a schematic structural view of an asymmetric double suction impeller according to an embodiment;
FIG. 2 is a schematic diagram of a construction of the present asymmetric double suction impeller for a vertical long shaft pump;
FIG. 3 is a schematic view of a construction of the present asymmetric double suction impeller for a horizontal pump;
the device comprises a hub 11, a first cover plate 21, a second cover plate 22, a front blade 31, a rear blade 32, a first flow channel 41, a second flow channel 42, a suction inlet 51, a water outlet 61, a water inlet section 1, a double suction impeller 2, a water outlet guide shell 3, a vertical impeller shaft 4, an upper liquid inlet 5, a lower liquid inlet 6, a pump body 101, a pump cover 201, a sealing ring 301, a shaft sleeve 401, a horizontal impeller shaft 501, a water outlet 601, a water inlet 701, a water pumping chamber 801, a first chamber 802, a second chamber 803 and a flow channel 901.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Referring to fig. 1, an asymmetric double suction impeller of a specific embodiment includes a hub 11, two sides of the hub 11 are respectively connected with cover plates at two sides of the hub 11 through a plurality of blades, and a flow channel is formed between the cover plates and the hub 11; the cover plates at two sides of the hub 11 comprise a first cover plate 21 and a second cover plate 22, and the first cover plate 21, the second cover plate 22 and the hub 11 are coaxially arranged; the flow passage formed between the first cover plate 21 and the hub 11 is a first flow passage 41, and the flow passage formed between the second cover plate 22 and the hub 11 is a second flow passage 42; the blades include a front blade 31 and a rear blade 32, the front blade 31 being disposed between the first cover plate 21 and the hub 11, the rear blade 32 being disposed between the second cover plate 22 and the hub 11; the centers of the first cover plate 21 and the second cover plate 22 are respectively provided with a suction inlet 51, and a water outlet 61 is formed between the inner wall of the outer edge of the first cover plate 21 and the inner wall of the outer edge of the second cover plate 22; the flow area of the first flow passage 41 is larger than the flow area of the second flow passage 42.
In the asymmetric double suction impeller of the embodiment, compared with the conventional double suction impeller in which two cover plates are symmetrically arranged to make the widths of the two flow channels equal, the widths of the first flow channel 41 and the second flow channel 42 in the asymmetric double suction impeller are different, so that different flow rates can be conveyed, and cavitation allowance is different, so that specific design requirements are met to meet special occasions for the difference of suction conditions at two sides of the double suction impeller.
In practice, the number of the front blades 31 and the rear blades 32 corresponds, and the arrangement positions in the circumferential direction correspond.
Referring to fig. 1 and 2, the present invention further provides a double suction centrifugal pump, which is a vertical long shaft pump, and comprises a vertical impeller shaft 4, a water outlet guide shell 3, and a water inlet section 1 connected below the water outlet guide shell 3; the asymmetric double-suction impeller is characterized in that the hub 11 is synchronously and rotatably connected to the vertical impeller shaft 4 and positioned in the water outlet diversion shell 3, the first cover plate 21 is positioned below, the second cover plate 22 is positioned above, the lower part of the water inlet section 1 is provided with the lower liquid inlet 6, and the water outlet diversion shell 3 is provided with the upper liquid inlet 5; the lower inlet 6 communicates with the first flow channel 41 and the upper inlet 5 communicates with the second flow channel 42.
When the asymmetric double-suction impeller is used for the vertical long-shaft pump, the problem that the upper side cavitation condition of the traditional conventional double-suction impeller is more serious due to the hydraulic difference of the upper liquid inlet and the lower liquid inlet can be solved; the placement of the double suction impeller 2 is adapted to the situation that the hydraulic difference exists between the suction inlets 51 at the two ends and the upper liquid inlet and the lower liquid inlet, so that the correction of cavitation allowance is facilitated, and the normal operation of the pump is ensured.
Referring to fig. 1 and 3, the present invention further provides a double suction centrifugal pump, which is a horizontal pump, and includes a horizontal impeller shaft 501, a seal ring 301, a shaft sleeve 401, a bearing (not shown), a pump body 101, and a pump cover 201 connected to one end of the pump body 101; the other end of the pump body 101 is provided with a water inlet end 701, the pump body 101 is internally provided with a water pumping chamber 801, the water pumping chamber 801 is communicated with the water inlet end 701 through a first chamber 802 in the pump body 101, and the pump body 101 is also provided with a water outlet end 601 communicated with the water pumping chamber 801; the asymmetric double suction impeller is characterized in that the hub 11 is synchronously and rotatably connected to the horizontal impeller shaft 501 and positioned in the pumping chamber 801, the water outlet 61 is communicated with the water outlet end 601, the first cover plate 21 faces the water inlet end 701, and the second cover plate 22 faces the pump cover 201; the first cover plate 21 is in dynamic sealing connection with the inner wall of the pump body 101, the second cover plate 22 is in dynamic sealing connection with the inner wall of the pump cover 201, and a second chamber 803 is formed between the second cover plate 22 and the pump cover 201; the pump body 101 and the pump cover 201 are further provided with a flow passage 901 for communicating the first chamber 802 and the second chamber 803.
When the asymmetric double-suction impeller is used for a horizontal pump, the different suction performances at two sides of the asymmetric double-suction impeller can replace a single impeller structure of a single-stage pump, and the flow passage 901 is arranged on the pump body 101 so that the two suction inlets 51 of the asymmetric double-suction impeller can be used for sucking fluid, so that the axial force can be balanced better, the pressure in a working chamber can be reduced by changing the suction performance, and the use, flushing and cooling of a mechanical seal can be guaranteed better.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. An asymmetric double-suction impeller comprises a hub, wherein two sides of the hub are respectively connected with cover plates at two sides of the hub through a plurality of blades, and a flow channel is formed between each cover plate and the hub; the method is characterized in that: the cover plates at two sides of the hub comprise a first cover plate and a second cover plate, and the first cover plate, the second cover plate and the hub are coaxially arranged; the flow channel formed between the first cover plate and the hub is a first flow channel, and the flow channel formed between the second cover plate and the hub is a second flow channel; the blades comprise front blades and rear blades, the front blades are arranged between the first cover plate and the hub, and the rear blades are arranged between the second cover plate and the hub; the centers of the first cover plate and the second cover plate are respectively provided with a suction inlet, and a water outlet is formed between the inner wall of the outer edge of the first cover plate and the inner wall of the outer edge of the second cover plate; the flow area of the first flow channel is larger than that of the second flow channel.
2. An asymmetric double suction impeller according to claim 1, wherein: the number of the front blades and the rear blades corresponds, and the arrangement positions in the circumferential direction correspond.
3. A double-suction centrifugal pump is a vertical long-shaft pump and comprises an impeller shaft, a water outlet guide shell and a water inlet section connected below the water outlet guide shell; the method is characterized in that: the asymmetric double-suction impeller of any one of claims 1-2, wherein the hub is synchronously and rotatably connected to the impeller shaft and positioned in the water outlet diversion shell, the first cover plate is positioned below, the second cover plate is positioned above, the lower part of the water inlet section is provided with a lower liquid inlet, and the water outlet diversion shell is provided with an upper liquid inlet; the lower liquid inlet is communicated with the first flow channel, and the upper liquid inlet is communicated with the second flow channel.
4. A double-suction centrifugal pump is a horizontal pump and comprises an impeller shaft, a pump body and a pump cover connected to one end of the pump body; the other end of the pump body is provided with a water inlet end, a water pressing chamber is arranged in the pump body, the water pressing chamber is communicated with the water inlet end through a first cavity in the pump body, and the pump body is also provided with a water outlet end communicated with the water pressing chamber; the method is characterized in that: the asymmetric double-suction impeller of any one of claims 1-2, wherein the hub is synchronously and rotatably connected to the impeller shaft and positioned in the pumping chamber, the water outlet is communicated with the water outlet end, the first cover plate faces the water inlet end, and the second cover plate faces the pump cover; the first cover plate is in dynamic sealing connection with the inner wall of the pump body, the second cover plate is in dynamic sealing connection with the inner wall of the pump cover, and a second cavity is formed between the second cover plate and the pump cover; the pump body and the pump cover are also provided with a flow passage which is communicated with the first chamber and the second chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210061745.3A CN114321000B (en) | 2022-01-19 | 2022-01-19 | Asymmetric double-suction impeller and double-suction centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210061745.3A CN114321000B (en) | 2022-01-19 | 2022-01-19 | Asymmetric double-suction impeller and double-suction centrifugal pump |
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| CN114321000A CN114321000A (en) | 2022-04-12 |
| CN114321000B true CN114321000B (en) | 2023-10-13 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101027523A (en) * | 2004-09-28 | 2007-08-29 | 大金工业株式会社 | Air conditioner |
| CN103982441A (en) * | 2014-04-25 | 2014-08-13 | 江苏江进泵业有限公司 | Novel double-entry vortex pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102502353B1 (en) * | 2014-06-24 | 2023-02-21 | 컨셉츠 엔알이씨, 엘엘씨 | Flow control structures for turbomachines and methods of designing the same |
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- 2022-01-19 CN CN202210061745.3A patent/CN114321000B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101027523A (en) * | 2004-09-28 | 2007-08-29 | 大金工业株式会社 | Air conditioner |
| CN103982441A (en) * | 2014-04-25 | 2014-08-13 | 江苏江进泵业有限公司 | Novel double-entry vortex pump |
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| CN114321000A (en) | 2022-04-12 |
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