CN212479597U - Horizontal single-suction two-stage centrifugal pump - Google Patents
Horizontal single-suction two-stage centrifugal pump Download PDFInfo
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- CN212479597U CN212479597U CN202021123692.6U CN202021123692U CN212479597U CN 212479597 U CN212479597 U CN 212479597U CN 202021123692 U CN202021123692 U CN 202021123692U CN 212479597 U CN212479597 U CN 212479597U
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Abstract
The utility model discloses a horizontal single-suction two-stage centrifugal pump, which comprises a motor and a pump body, wherein the pump body comprises a pump shell, a pump cover, a primary impeller, a secondary impeller and a guide vane, and a water inlet side of the pump shell is connected with a water inlet flange; the cavity of the pump shell is internally provided with a cavity separation plate, the cavity positioned on the left side of the cavity separation plate is an annular cavity, the cavity positioned on the right side of the cavity separation plate is a spiral volute cavity, the primary impeller and the guide vane are arranged in the annular cavity to form an annular water pumping chamber, the secondary impeller is arranged in the spiral volute cavity to form a spiral water pumping chamber, a through hole is formed in the center of the cavity separation plate, the opening end of the secondary impeller is embedded in the through hole in a clearance mode, the primary impeller and the secondary impeller are arranged coaxially in the forward direction, and a spacing sleeve coaxial with the primary impeller and the secondary impeller is arranged between the primary impeller and the secondary impeller. The utility model has the advantages of small hydraulic loss, low energy consumption, good stability, low cost, strong applicability and the like.
Description
Technical Field
The utility model relates to a horizontal single suction doublestage centrifugal pump belongs to centrifugal pump technical field.
Background
Because of adopting the two-stage centrifugal pump of two impellers, compared with a single-stage centrifugal pump, the two-stage centrifugal pump can improve the lift of the centrifugal pump, and compared with a multi-stage centrifugal pump, the two-stage centrifugal pump has the advantage of simple structure, so the two-stage centrifugal pump is widely used for civil fire protection, high-rise water supply, farmland irrigation and drainage and the like.
The existing single-suction two-stage centrifugal pump comprises a motor, a pump shell, a pump cover, a primary impeller and a secondary impeller, wherein the motor is connected with the pump shell through the pump cover, the primary impeller and the secondary impeller are coaxially arranged in a cavity of the pump shell, the primary impeller is arranged in a front-section cavity of the pump shell, and the secondary impeller is arranged in a rear-section cavity of the pump shell. Since the liquid generates a large axial force after flowing through the primary impeller and the secondary impeller and the axial force of the pump is larger as the head is higher, the service life of a bearing and a mechanical seal on a pump shaft is affected, the operation stability of the centrifugal pump is poor and the service life of the centrifugal pump is shortened, and therefore, in the structural design of the single-suction two-stage centrifugal pump, the axial force must be eliminated. In order to eliminate the influence of axial force, the design mainly adopts a counteracting structure design that two impellers are arranged in forward and reverse directions, but the design can lead liquid to pass through a plurality of inflection points from the outlet of the primary impeller and then to run to the inlet of the secondary impeller, so that the hydraulic loss is large, and the running efficiency of the centrifugal pump is influenced. In addition, under the current background of the era of energy conservation and emission reduction, the improvement of the operating efficiency of the centrifugal pump also becomes an urgent need of the market. Therefore, the development of a single-suction two-stage centrifugal pump which has high operation efficiency, energy conservation and good operation stability and can meet the requirement of high-lift use is urgently needed in the field.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem and the demand that prior art exists, the utility model aims at providing an operating efficiency is high, energy-conserving and operating stability is good to can satisfy high-lift user demand's horizontal single suction doublestage centrifugal pump.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a horizontal single-suction two-stage centrifugal pump comprises a motor and a pump body, wherein the pump body comprises a pump shell, a pump cover, a primary impeller, a secondary impeller and a guide vane, and a water inlet flange is connected to the side of a water inlet of the pump shell; the cavity of the pump shell is internally provided with a cavity separation plate, the cavity positioned on the left side of the cavity separation plate is an annular cavity, the cavity positioned on the right side of the cavity separation plate is a spiral volute cavity, the primary impeller and the guide vane are arranged in the annular cavity to form an annular water pumping chamber, the secondary impeller is arranged in the spiral volute cavity to form a spiral water pumping chamber, a through hole is formed in the center of the cavity separation plate, the opening end of the secondary impeller is embedded in the through hole in a clearance mode, the primary impeller and the secondary impeller are arranged coaxially in the forward direction, and a spacing sleeve coaxial with the primary impeller and the secondary impeller is arranged between the primary impeller and the secondary impeller.
According to a preferable scheme, an outer convex opening circular ring A which is concentric with a shaft hole on the secondary impeller is arranged on a right cover plate of the secondary impeller, an outer convex opening circular ring B which is matched with the outer convex opening circular ring A and has the same axle center is arranged on a pump cover end face of the right cover plate close to the secondary impeller, and the outer convex opening circular ring A and the outer convex opening circular ring B are in clearance nested connection.
In a further preferred scheme, a plurality of balance holes are uniformly distributed on the right cover plate of the secondary impeller, and each balance hole is a through hole which is positioned between two adjacent impeller blades and is communicated with the opening cavity of the secondary impeller and the outer convex opening ring A.
The guide vane is a static fixed guide vane and is fixed in the annular cavity by the abutting of the water inlet flange and the limiting of the cavity separation plate.
According to the preferable scheme, the outer end of the water inlet flange is a national standard flange joint end, the inner end of the water inlet flange is a lace ending end, and the lace ending end is connected with the pump shell through a bolt.
In one embodiment, the first-stage impeller is embedded in the connecting cavity of the guide vane in a clearance mode.
In a preferred embodiment, a mechanical seal is provided between the secondary impeller and the pump cover.
According to a preferred scheme, a national standard flange is arranged at a water outlet of a pump shell.
In a preferred scheme, the primary impeller, the secondary impeller and the spacing sleeve are directly connected with a motor shaft key pin extending into the pump shell.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a improve the pump case structure, make the left side cavity of pump case be ring shape cavity, the right side cavity is spiral volute shape cavity, and make first impeller and stator setting constitute annular pumping chamber in ring shape cavity, secondary impeller sets up and constitutes spiral pumping chamber in spiral volute shape cavity, and first impeller and secondary impeller all set up with the forward is coaxial, make the horizontal single-suction two-stage centrifugal pump, have advantages such as hydraulic loss is little, the energy consumption is low, stability is good, not only can obviously improve the lift under equal power, can obviously reduce motor power under realizing the same lift moreover, thus reduce the cost; moreover, the utility model also has the advantages of convenient installation, strong applicability, wide application range, etc.; in a word, compared with the prior art, the utility model has obvious progress and obvious practical value.
Drawings
Fig. 1 is a schematic perspective view of a horizontal single-suction two-stage centrifugal pump according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structural view of the pump body according to the embodiment of the present invention;
fig. 3 is a schematic perspective view of a pump casing according to an embodiment of the present invention;
fig. 4 is a schematic sectional view of a pump casing according to an embodiment of the present invention;
fig. 5 is a right side view schematic structural diagram of the secondary impeller according to the embodiment of the present invention;
fig. 6 is a left side view schematic structural diagram of the secondary impeller according to the embodiment of the present invention;
fig. 7 is a schematic view of a connection structure between the secondary impeller and the pump cover according to the embodiment of the present invention;
fig. 8 is a schematic view of the working principle of the horizontal single-suction two-stage centrifugal pump according to the embodiment of the present invention.
The numbers in the figures are as follows: 1. a motor; 11. a motor shaft; 2. a pump body; 21. a pump housing; 211. a cavity partition plate; 2111. a through hole; 212. a circular cavity; 213. a spiral volute shaped cavity; 22. a pump cover; 221. the end surface of the pump cover; 2211. an outer convex opening ring B; 23. a first stage impeller; 24. a secondary impeller; 241. an open end of the secondary impeller; 242. a right shroud of the secondary impeller; 2421. a shaft hole; 2422. an outer convex opening ring A; 2423. a balance hole; 243. an impeller blade; 244. an open cavity of the secondary impeller; 25. a guide vane; 26. a spacer sleeve; 27. mechanical sealing; 28. a water inlet flange; 281. a national standard flange joint end; 282. a lace ending end; 29. a national standard flange; 3. and locking the nut by the impeller.
Detailed Description
The technical solution of the present invention will be further clearly and specifically described below with reference to the following embodiments and the accompanying drawings.
Examples
Please refer to fig. 1, fig. 2, fig. 7 and fig. 8: the horizontal single-suction two-stage centrifugal pump provided by the embodiment comprises a motor 1 and a pump body 2, wherein the pump body 2 comprises a pump shell 21, a pump cover 22, a primary impeller 23, a secondary impeller 24 and guide vanes 25, the primary impeller 23 and the secondary impeller 24 are coaxially arranged in the forward direction, and a spacer bush 26 coaxial with the primary impeller 23 and the secondary impeller 24 is arranged between the primary impeller 23 and the secondary impeller 24 (in the embodiment, the primary impeller 23, the secondary impeller 24 and the spacer bush 26 are directly connected with a motor shaft 11 key pin extending into the pump shell, and an impeller locking nut 3 is arranged at the tail end of the motor shaft 11); a mechanical seal 27 is provided between the secondary impeller 24 and the pump cover 22; the water inlet side of the pump shell 21 is connected with a water inlet flange 28, and the water outlet of the pump shell 21 is provided with a national standard flange 29.
Preferably, the outer end of the water inlet flange 28 is a national standard flange joint end 281, the inner end of the water inlet flange is a lace ending end 282, and the lace ending end 282 is connected with the pump casing 21 through a bolt.
Please refer to fig. 3 and fig. 4 again: a cavity separation plate 211 is arranged in the cavity of the pump shell 21, the cavity positioned on the left side of the cavity separation plate is a circular ring-shaped cavity 212, the cavity positioned on the right side of the cavity separation plate is a spiral volute-shaped cavity 213, and a through hole 2111 is arranged in the center of the cavity separation plate 211.
Please refer to fig. 2 and fig. 8 again: the first-stage impeller 23 and the guide vanes 25 are arranged in the annular cavity 212, the guide vanes 25 are static fixed guide vanes and are fixed in the annular cavity 212 by the abutting of the water inlet flange 28 and the limiting of the cavity separation plate 211, the first-stage impeller 23 is embedded in a connection cavity of the guide vanes in a clearance mode, and the first-stage impeller 23, the guide vanes 25 and the annular cavity 212 form an annular water pumping chamber; the secondary impeller 24 is arranged in the spiral volute-shaped cavity 213, the opening end 241 of the secondary impeller is embedded in the through hole 2111 in a clearance mode, and the secondary impeller 24 and the spiral volute-shaped cavity 213 form a spiral pumping chamber.
Please refer to fig. 2, fig. 7 and fig. 8: an outer convex opening circular ring A2422 concentric with the shaft hole 2421 on the secondary impeller is arranged on the right cover plate 242 of the secondary impeller, an outer convex opening circular ring B2211 matched with the outer convex opening circular ring A2422 and coaxial with the outer convex opening circular ring A is arranged on the pump cover end surface 221 close to the right cover plate 242 of the secondary impeller, and the outer convex opening circular ring A2422 and the outer convex opening circular ring B2211 are in clearance nested connection.
Please refer to fig. 5, fig. 6 and fig. 7: a plurality of balance holes 2423 are uniformly distributed on the right cover plate 242 of the secondary impeller, and each balance hole 2423 is a through hole which is located between two adjacent impeller blades 243 and is communicated with the opening cavity 244 of the secondary impeller and the outer convex opening circular ring a 2422. Through the unique design, the secondary impeller and the pump cover can be matched to form an axial force balance system to achieve the effect of balancing the axial force, so that the centrifugal pump is good in stability and long in service life.
Please refer to fig. 8 again:
liquid flows into the primary impeller 23 through the water inlet flange 28, is guided by the guide vane 25 and then directly enters the secondary impeller 24, and after the liquid is subjected to two-stage pressurization of the annular pressurizing chamber and the spiral pressurizing chamber, the lift can be superposed, and then the liquid is smoothly discharged from the spiral volute cavity 213; by the water flow direction that figure 8 shows, adopt pump body structural design, hydraulic loss is very little, the energy consumption is low, therefore can realize making the lift obtain showing the improvement under equal power, can make motor power obviously reduce under realizing the same lift.
In summary, it can be seen that: the horizontal single-suction two-stage centrifugal pump has the advantages of small hydraulic loss, low energy consumption, good stability and the like, can obviously improve the lift under the same power, and can obviously reduce the power of a motor under the same lift, thereby reducing the cost; moreover, the utility model also has the advantages of convenient installation, strong applicability, wide application range, etc.; thus, the present invention provides significant improvements over the prior art.
It is finally necessary to point out here: the above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. A horizontal single-suction two-stage centrifugal pump comprises a motor and a pump body, wherein the pump body comprises a pump shell, a pump cover, a primary impeller, a secondary impeller and a guide vane, and a water inlet flange is connected to the side of a water inlet of the pump shell; the method is characterized in that: the cavity of the pump shell is internally provided with a cavity separation plate, the cavity positioned on the left side of the cavity separation plate is an annular cavity, the cavity positioned on the right side of the cavity separation plate is a spiral volute cavity, the primary impeller and the guide vane are arranged in the annular cavity to form an annular water pumping chamber, the secondary impeller is arranged in the spiral volute cavity to form a spiral water pumping chamber, a through hole is formed in the center of the cavity separation plate, the opening end of the secondary impeller is embedded in the through hole in a clearance mode, the primary impeller and the secondary impeller are arranged coaxially in the forward direction, and a spacing sleeve coaxial with the primary impeller and the secondary impeller is arranged between the primary impeller and the secondary impeller.
2. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: the right cover plate of the secondary impeller is provided with an outward convex opening circular ring A which is concentric with the shaft hole on the secondary impeller, the end surface of the pump cover close to the right cover plate of the secondary impeller is provided with an outward convex opening circular ring B which is matched with the outward convex opening circular ring A and has the same axle center, and the outward convex opening circular ring A and the outward convex opening circular ring B are in clearance nested connection.
3. The horizontal single-suction two-stage centrifugal pump according to claim 2, wherein: and a plurality of balance holes are uniformly distributed on the right cover plate of the secondary impeller, and each balance hole is a through hole which is positioned between two adjacent impeller blades and is communicated with the opening cavity of the secondary impeller and the outer convex opening ring A.
4. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: the guide vane is a static fixed guide vane and is fixed in the annular cavity by the abutting of the water inlet flange and the limiting of the cavity partition plate.
5. The horizontal single-suction two-stage centrifugal pump according to claim 1 or 4, characterized in that: the outer end of the water inlet flange is a national standard flange joint end, the inner end of the water inlet flange is a lace ending end, and the lace ending end is connected with the pump shell through a bolt.
6. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: the first-stage impeller is embedded in the connecting cavity of the guide vane in a clearance mode.
7. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: and a mechanical seal is arranged between the secondary impeller and the pump cover.
8. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: and a national standard flange is arranged at the water outlet of the pump shell.
9. The horizontal single-suction two-stage centrifugal pump according to claim 1, wherein: the primary impeller, the secondary impeller and the spacing sleeve are directly connected with a motor shaft key pin extending into the pump shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021123692.6U CN212479597U (en) | 2020-06-17 | 2020-06-17 | Horizontal single-suction two-stage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021123692.6U CN212479597U (en) | 2020-06-17 | 2020-06-17 | Horizontal single-suction two-stage centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN212479597U true CN212479597U (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021123692.6U Active CN212479597U (en) | 2020-06-17 | 2020-06-17 | Horizontal single-suction two-stage centrifugal pump |
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| Country | Link |
|---|---|
| CN (1) | CN212479597U (en) |
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2020
- 2020-06-17 CN CN202021123692.6U patent/CN212479597U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A horizontal single suction two-stage centrifugal pump Effective date of registration: 20230421 Granted publication date: 20210205 Pledgee: Agricultural Bank of China Limited Shanghai Songjiang Sub-branch Pledgor: SHANGHAI CHENGFENG FLUID EQUIPMENT CO.,LTD. Registration number: Y2023980038670 |