CN114321000A - 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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- CN114321000A CN114321000A CN202210061745.3A CN202210061745A CN114321000A CN 114321000 A CN114321000 A CN 114321000A CN 202210061745 A CN202210061745 A CN 202210061745A CN 114321000 A CN114321000 A CN 114321000A
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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 on two sides of the hub through a plurality of blades, and a flow passage is formed between the cover plates and the hub; the cover plates on 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 passage is larger than that of the second flow passage, and a vertical long-shaft pump and a 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 two flow channels to be equal, the asymmetric double-suction impeller has the advantages that the widths of the first flow channel and the second flow channel are different, so that different flow rates can be conveyed, cavitation allowances are different, and the specific design requirements are met to meet the special occasions with different suction conditions on two sides of the double-suction impeller.
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 causing water to move centrifugally as a result of the rotation of an impeller. 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 rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell. The impeller is an energy supply device of the centrifugal pump and is a component for directly applying work to liquid in the pump; the suction inlet in the center of the pump shell is connected with a suction pipeline, and the bottom of the suction pipeline is provided with a one-way bottom valve; the discharge port beside the pump casing is connected with a discharge pipeline provided with a regulating valve.
Centrifugal pumps can be divided into single-suction centrifugal pumps and double-suction centrifugal pumps according to the suction mode of an impeller. The front cover plate and the rear cover plate of the single-suction impeller are asymmetric, so that the force of medium fluid pressurized by the impeller on the impeller cover plate is unbalanced, and additional axial force pointing to a suction eye (the direction of a lower water inlet) of the single-suction impeller is generated; therefore, the single-suction centrifugal pump is structurally unavoidable in axial force generated by the impeller, so that the working load of the thrust bearing of the pump is increased, and the service life of the bearing is shortened.
CN201377433Y in the prior art provides a vertical long axis double suction pump that completely eliminates the additional axial force directed to the suction eye of the impeller. The impeller is subjected to static balance check, is fixed by a shaft sleeve and shaft sleeve nuts on two sides, the axial position of the impeller can be adjusted by the shaft sleeve nuts, the axial force of the impeller is balanced by utilizing the symmetrical arrangement of blades of the impeller, and possibly some residual axial force is born by a bearing at the same shaft end.
However, the existing double-suction centrifugal pump is not enough to meet the special situation that the suction performances of two ends of an impeller of the double-suction pump are different, for example, a vertical double-suction pump is used under the same liquid level, the liquid levels of an upper suction port and a lower suction port of the impeller of the double-suction centrifugal pump have height difference, and the double-suction centrifugal pump is under the special working condition of a horizontal double-suction pump.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an asymmetric double-suction impeller and a double-suction centrifugal pump, which can avoid the problem that the double-suction impeller is not suitable for being used under the working condition that the suction conditions at two ends are different because the suction performances at two ends of the impeller of the double-suction pump are consistent, and obtain the effect of stable operation of the double-suction pump under the specific working condition that the suction conditions at two ends are different.
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 on 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 on 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; 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 blades comprise a front blade and a rear blade, the front blade is arranged between the first cover plate and the hub, and the rear blade is arranged between the second cover plate and the hub; suction ports are formed in the centers of the first cover plate and the second cover plate, 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 passage is larger than that of the second flow passage.
Further perfecting the technical scheme, the number of the front blades corresponds to that of the rear blades, and the circumferential arrangement positions of the front blades correspond to that of the rear blades.
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 diversion shell and a water inlet section connected below the water outlet diversion shell; the asymmetric double-suction impeller is characterized in that a hub is synchronously and rotatably connected to an impeller shaft and positioned in the water outlet guide shell, a first cover plate is positioned below, a 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 a water outlet end communicated with the water pressing chamber is also arranged on the pump body; the asymmetric double-suction impeller is characterized in that a hub is synchronously and rotatably connected to an impeller shaft and positioned in a water pressing chamber, a water outlet is communicated with a water outlet end, a first cover plate faces to a water inlet end, and a second cover plate faces to a 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; and the pump body and the pump cover are also provided with a flow passage for communicating the first cavity and the second cavity.
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 two flow channels to be equal, the asymmetrical double-suction impeller has the advantages that the widths of the first flow channel and the second flow channel in the asymmetrical double-suction impeller are different, so that different flow rates can be conveyed, cavitation allowances of the first flow channel and the second flow channel are different, and the specific design requirements are met to meet the special occasions with different suction conditions on two sides of the double-suction impeller.
2. According to the double-suction centrifugal pump, when the asymmetric double-suction impeller is used for a vertical long-shaft pump, the problem that the cavitation erosion condition on the upper side of the 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 double-suction impeller is arranged to enable the suction ports at the two ends to be matched with the upper liquid inlet and the lower liquid inlet in the condition of hydraulic difference, so that the cavitation allowance can be corrected, and the normal operation of the pump can be guaranteed.
3. According to the double-suction centrifugal pump, when the asymmetric double-suction impeller is used for a horizontal pump, 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 pump body is provided with the flow channel, so that two suction ports of the asymmetric double-suction impeller can be used for sucking fluid, 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.
Drawings
FIG. 1 is a schematic structural view of an asymmetric double suction impeller according to an embodiment;
FIG. 2 is a schematic structural view of the present asymmetric double suction impeller for use in a vertical long axis pump;
FIG. 3 is a schematic structural view of the present asymmetric double suction impeller for use in a horizontal pump;
the water inlet guide shell 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 end 601, a water inlet end 701, a water pressing chamber 801, a first cavity 802, a second cavity 803 and a flow channel 901.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1, an asymmetric double-suction impeller according to an embodiment includes a hub 11, wherein two sides of the hub 11 are respectively connected to cover plates on 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 on 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; a flow passage formed between the first cover plate 21 and the hub 11 is a first flow passage 41, and a flow passage formed between the second cover plate 22 and the hub 11 is a second flow passage 42; the blades comprise a front blade 31 and a rear blade 32, the front blade 31 is arranged between the first cover plate 21 and the hub 11, and the rear blade 32 is arranged between the second cover plate 22 and the hub 11; suction ports 51 are formed in the centers of the first cover plate 21 and the second cover plate 22, 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.
Compared with the conventional double-suction impeller in which two cover plates are symmetrically arranged to enable the widths of two flow channels to be equal, the asymmetric double-suction impeller of the embodiment has the advantages that 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, cavitation allowances of the asymmetric double-suction impeller are different, and specific design requirements are met to meet special occasions for the difference of suction conditions on two sides of the double-suction impeller.
In practice, the number of the front blades 31 and the number of the rear blades 32 correspond to each other, and the installation positions in the circumferential direction correspond to each other.
Referring to fig. 1 and 2, the present invention further provides a double-suction centrifugal pump, which is a vertical long-shaft pump, and includes a vertical impeller shaft 4, an outlet guide shell 3, and a water inlet section 1 connected below the outlet guide shell 3; the asymmetric double-suction impeller also comprises the asymmetric double-suction impeller, the hub 11 is synchronously and rotatably connected to the vertical impeller shaft 4 and is 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.
According to the embodiment, when the asymmetric double-suction impeller is used for a vertical long-shaft pump, the problem that the cavitation on the upper side of the conventional double-suction impeller is more serious due to hydraulic difference of the upper liquid inlet and the lower liquid inlet can be solved; the double-suction impeller 2 is arranged to enable the suction ports 51 at the two ends to be matched with the upper liquid inlet and the lower liquid inlet in the condition of hydraulic pressure difference, so that the cavitation allowance can be corrected, and the normal operation of the pump can be guaranteed.
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 sealing ring 301, a shaft sleeve 401 and a bearing (not shown in the figure), 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, a water pressurizing chamber 801 is arranged in the pump body 101, the water pressurizing chamber 801 is communicated with the water inlet end 701 through a first cavity 802 in the pump body 101, and the pump body 101 is further provided with a water outlet end 601 communicated with the water pressurizing chamber 801; the asymmetric double-suction impeller also comprises the asymmetric double-suction impeller, the hub 11 is synchronously and rotatably connected to the horizontal impeller shaft 501 and positioned in the water 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 cavity 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 communicating the first chamber 802 and the second chamber 803.
When the asymmetric double-suction impeller is used for a horizontal pump, different suction performances on two sides of the asymmetric double-suction impeller can replace a single impeller structure of a single-stage pump, and the pump body 101 is provided with the flow channel 901, so that two suction ports 51 of the asymmetric double-suction impeller can be used for fluid suction, 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 better ensured.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in 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 on 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 on 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; 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 blades comprise a front blade and a rear blade, the front blade is arranged between the first cover plate and the hub, and the rear blade is arranged between the second cover plate and the hub; suction ports are formed in the centers of the first cover plate and the second cover plate, 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 passage is larger than that of the second flow passage.
2. The asymmetric double suction impeller of claim 1, wherein: the number of the front blades corresponds to that of the rear blades, and the arrangement positions of the front blades and the rear blades in the circumferential direction correspond to each other.
3. A double-suction centrifugal pump is a vertical long-shaft pump and comprises an impeller shaft, a water outlet diversion shell and a water inlet section connected below the water outlet diversion shell; the method is characterized in that: the asymmetric double-suction impeller further comprises an asymmetric double-suction impeller according to any one of claims 1-2, wherein a hub is synchronously and rotatably connected to an impeller shaft and positioned in a water outlet guide shell, a first cover plate is positioned below, a second cover plate is positioned above, a lower liquid inlet is formed in the lower part of the water inlet section, and an upper liquid inlet is formed in the water outlet guide shell; 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 a water outlet end communicated with the water pressing chamber is also arranged on the pump body; the method is characterized in that: the asymmetric double-suction impeller is characterized by further comprising an asymmetric double-suction impeller according to any one of claims 1-2, wherein the hub is synchronously and rotatably connected to the impeller shaft and located in the water pressing 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; and the pump body and the pump cover are also provided with a flow passage for communicating the first cavity and the second cavity.
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 |
|---|---|---|---|
| CN202210061745.3A CN114321000B (en) | 2022-01-19 | 2022-01-19 | Asymmetric double-suction impeller and double-suction centrifugal pump |
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| CN114321000A true CN114321000A (en) | 2022-04-12 |
| CN114321000B CN114321000B (en) | 2023-10-13 |
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| CN202210061745.3A Active CN114321000B (en) | 2022-01-19 | 2022-01-19 | Asymmetric double-suction impeller and double-suction centrifugal pump |
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Citations (3)
| 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 |
| US20150369073A1 (en) * | 2014-06-24 | 2015-12-24 | Concepts Eti, Inc. | Flow Control Structures For Turbomachines and Methods of Designing The Same |
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2022
- 2022-01-19 CN CN202210061745.3A patent/CN114321000B/en active Active
Patent Citations (3)
| 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 |
| US20150369073A1 (en) * | 2014-06-24 | 2015-12-24 | Concepts Eti, Inc. | Flow Control Structures For Turbomachines and Methods of Designing The Same |
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| Publication number | Publication date |
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| CN114321000B (en) | 2023-10-13 |
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