CN217206894U - Multi-stage centrifugal pump - Google Patents

Abstract

The utility model relates to a centrifugal pump technical field discloses a multistage centrifugal pump, it is including the section of intaking, first-stage impeller, the stator, the middle section, secondary impeller, the last-stage impeller, go out the water section, the section of intaking is equipped with and intakes and prevents the muscle of revolving, it prevents the muscle of revolving to go out the water section to be equipped with out water, the middle section is equipped with the middle part and prevents the muscle of revolving, it prevents revolving muscle and stator to intake, first-stage impeller and the cooperation of the section of intaking form first preventing the antechamber of revolving, the muscle is prevented revolving muscle and stator in the middle part, secondary impeller and middle section cooperation form the second and prevent the antechamber of revolving, the muscle is prevented revolving muscle and last-stage impeller and play water section cooperation form the third and prevent the antechamber of revolving, it prevents revolving the back chamber to go out water and prevent revolving muscle and last-stage impeller cooperation form. Compared with the prior art, the multistage centrifugal pump obviously reduces the liquid rotation driven by the rotation of the impeller by arranging the anti-rotation front cavity and the anti-rotation rear cavity, reduces the hydraulic loss caused by the liquid rotation, and improves the efficiency of the water pump; the rotatory reduction of liquid can reduce the vibration of water pump equally, is favorable to promoting the stability of water pump, guarantees the normal operating of water pump.

Description

Multi-stage centrifugal pump

Technical Field

The utility model relates to a centrifugal pump field especially relates to a multistage centrifugal pump.

Background

The centrifugal pump is a pump for conveying a liquid by centrifugal force generated when an impeller rotates. The multistage centrifugal pump integrates more than two centrifugal pumps with the same function, the medium pressure relief opening of the fluid channel structure on the first stage is communicated with the inlet of the second stage, the medium pressure relief opening of the second stage is communicated with the inlet of the third stage, the structures are mutually connected in series, and the multistage centrifugal pump can improve the set pressure and meet the requirements of part of special application occasions.

The existing multistage centrifugal pump has more impeller stages, the impeller rotates to cause liquid in an impeller cavity to rotate, and a large amount of liquid rotates to form hydraulic vortex loss, so that the efficiency of the multistage pump is low; furthermore, the vortex formed by rotation can also cause unstable flow of liquid, increase the vibration of the water pump and reduce the operation reliability of the water pump; furthermore, the increase of the impeller stages also causes the pump shaft to be too long, the flushing and lubricating effects of the sliding bearing are poor, and the wear of the sliding bearing is increased due to the slight change of the too long pump shaft, so that the service life of the water pump is shortened or the water pump is directly damaged.

In addition, because the impeller of the multi-stage pump has more stages, the pump head is very high, and the axial force generated during operation is very large, high-pressure liquid is generally adopted to carry out balanced pressure relief on the axial force in the prior art, the high-pressure liquid is not fully utilized, and the high-pressure liquid is directly leaked at the suction inlet of the water inlet section, so that the motor of the water pump does no work, the energy is wasted, and the operation cost of the water pump is increased; the unbalanced axial force of the multistage pump can also cause the water pump shaft to bear overlarge axial thrust, the bearing has high temperature, operation vibration and large noise and is easy to damage, and the normal use of the pump is also influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a multistage centrifugal pump, it has advantages such as structural design is ingenious, liquid rotation degree is little.

Based on this, the utility model provides a multistage centrifugal pump, it includes water inlet section, first impeller, stator, middle section, secondary impeller, last impeller, play water section, balanced hub, machine seal seat, cartridge machine seal, pump shaft, slide bearing lid, slide bearing, sliding sleeve, bearing box support, shaft coupling and motor, the water inlet section is equipped with into water and prevents the muscle of revolving, it prevents the muscle of revolving to go out water to go out the water section to be equipped with, the middle section is equipped with middle part and prevents the muscle of revolving, the muscle of preventing revolving of intaking with the stator, first impeller and the cooperation of the section of intaking forms the first and prevents the preceding chamber of revolving of cladding the first impeller, the muscle of preventing revolving with the stator, secondary impeller and the cooperation of the middle section forms the second and prevents the preceding chamber of revolving of cladding of secondary impeller, the muscle of preventing revolving with the last impeller and the cooperation of the section of going out water forms the third and prevents the preceding chamber of revolving of cladding the last impeller, the water outlet anti-rotation rib is matched with the final-stage impeller to form an anti-rotation rear cavity for coating the final-stage impeller.

In some embodiments of this application, still be equipped with first butt joint hole, backward flow hole, backflow ring, washing hole and washing ring on the section of intaking, backflow ring with the stator with the cooperation of first-stage impeller forms the backward flow chamber, wash the ring with slide bearing with the cooperation of sliding sleeve forms and washes the chamber.

In some embodiments of this application, still be equipped with second butt joint hole, pressure release ring, balancing ring on the play water section, balancing ring with balanced hub with the cooperation of final stage impeller forms balanced chamber, pressure release ring with balanced hub with the cooperation of machine seal seat forms pressure release chamber.

In some embodiments of the present application, the sliding bearing cooperates with the sliding sleeve and the sliding bearing cover to form a lubrication cavity, and a backflow groove is disposed on the sliding bearing cover.

In some embodiments of this application, collection dress formula machine seals through wash lubricated pipe with lubricated chamber is linked together, balanced chamber passes through the compensating ring with the pressure release chamber is linked together, the pressure release chamber pass through balanced pipe the pressure release hole with the backward flow chamber is linked together, the backward flow chamber passes through the washing hole with it is linked together to wash the chamber, wash the chamber and pass through the backwash tank with lubricated chamber is linked together.

In some embodiments of the present application, the assembly further comprises an assembly member, the assembly member comprises a horizontally arranged bottom plate and a supporting plate perpendicular to the bottom plate, and the bottom plate and the supporting plate are respectively provided with a bolt and a through hole.

The embodiment of the utility model provides a multistage centrifugal pump, compared with the prior art, its beneficial effect lies in:

the embodiment of the utility model provides a multistage centrifugal pump, which comprises a water inlet section, a first-stage impeller, a guide vane, a middle section, a second-stage impeller, a last-stage impeller, a water outlet section, a balance hub and a machine seal seat, the integrated mechanical seal, the pump shaft, the sliding bearing cover, the sliding bearing, the sliding shaft sleeve, the bearing box support, the coupling and the motor, wherein the water inlet section is provided with a water inlet anti-rotation rib, the water outlet section is provided with a water outlet anti-rotation rib, the middle section is provided with a middle anti-rotation rib, the water inlet anti-rotation rib is matched with the guide vane, the first-stage impeller and the water inlet section to form a first anti-rotation front cavity for coating the first-stage impeller, the middle anti-rotation rib is matched with the guide vane, the secondary impeller and the middle section to form a second anti-rotation front cavity for coating the secondary impeller, the middle anti-rotation rib is matched with the final-stage impeller and the water outlet section to form a third anti-rotation front cavity for coating the final-stage impeller, and the water outlet anti-rotation rib is matched with the final-stage impeller to form an anti-rotation rear cavity for coating the final-stage impeller. Based on the structure, the multistage centrifugal pump provided by the application is provided with the first anti-rotation front cavity, the second anti-rotation front cavity, the third anti-rotation front cavity and the anti-rotation rear cavity, and the anti-rotation front cavity and the anti-rotation rear cavity are arranged to obviously reduce the liquid rotation driven by the rotation of the impeller, so that the hydraulic loss caused by the liquid rotation is reduced, the efficiency of the water pump is improved, the consumption of the water pump is reduced, and the energy is saved; furthermore, the vibration of the water pump can be reduced by reducing the rotation of the liquid, so that the stability of the water pump is improved, and the normal operation of the water pump is ensured.

Drawings

Fig. 1 is a schematic structural view of a multistage centrifugal pump according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a water inlet section of the multistage centrifugal pump according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a water outlet section of the multistage centrifugal pump according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a middle section structure of the multistage centrifugal pump according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a reinforced assembly according to an embodiment of the present invention.

In the figure, 1, a water inlet section; 2. a first stage impeller; 3. a guide vane; 4. a middle section; 5. a secondary impeller; 6. a last stage impeller; 7. a water outlet section; 8. water inlet anti-rotation ribs; 9. the water outlet anti-rotation rib; 10. the middle part is provided with anti-rotation ribs; 11. a first anti-rotation front cavity; 12. a second anti-rotation front cavity; 13. a third anti-rotation front cavity; 14. a rotation-proof rear cavity; 15. a balance hub; 16. a machine seal seat; 17. packaging type machine sealing; 18. a shaft sleeve; 19. a bearing end cap; 20. a bearing; 21. a bushing; 22. a round nut; 23. a pump unit; 24. a motor; 25. electrically connecting; 26. a bearing housing bracket; 27. a bearing gland; 28. a gasket; 29. a reflux cavity; 30. a balance tube; 31. flushing the lubricating pipe; 32. a balancing chamber; 33. a pressure relief cavity; 34. flushing the cavity; 35. a sliding shaft sleeve; 36. a pump shaft; 37. a sliding bearing; 38. a snap ring; 39. a lubrication chamber; 40. a sliding bearing cover; 41. a reflux tank; 42. a pull rod; 43. a first mating hole; 44. a return orifice; 45. a reflux ring; 46. flushing the hole; 47. flushing the ring; 48. a second docking hole; 49. a pressure relief vent; 50. a pressure relief ring; 51. a balance ring; 52. a base plate; 53. a supporting plate; 54. a through hole; 55. and (4) bolts.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

It should be understood that the present invention uses the terms "front", "back", etc. to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "front" information may also be referred to as "back" information, and "back" information may also be referred to as "front" information without departing from the scope of the present invention.

As shown in fig. 1 to 5, an embodiment of the present invention provides a multistage centrifugal pump, which includes a water inlet section 1, a first-stage impeller 2, a guide vane 3, a middle section 4, a second-stage impeller 5, a last-stage impeller 6, a water outlet section 7, a balance hub 15, a machine seal seat 16, a container-type machine seal 17, a pump shaft 36, a sliding bearing cover 40, a sliding bearing 37, a sliding shaft sleeve 35, a bearing box support 26, a shaft coupling and a motor 24, wherein the water inlet section 1 is provided with a water inlet rotation preventing rib 8, the water outlet section 7 is provided with a water outlet rotation preventing rib 9, the middle section 4 is provided with a middle rotation preventing rib 10, the water inlet rotation preventing rib 8 cooperates with the guide vane 3, the first-stage impeller 2 and the water inlet section 1 to form a first rotation preventing front cavity 11 for covering the first-stage impeller 2, the middle rotation preventing rib 10 cooperates with the guide vane 3, the second-stage impeller 5 and the middle section 4 to form a second rotation preventing front cavity 12 for covering the second-stage impeller 5, the middle rotation preventing rib 10 cooperates with the last-stage impeller 6 and the water outlet section 7 to form a third rotation preventing front cavity 13 for covering the last-stage impeller 6, the water outlet anti-rotation rib 9 is matched with the final-stage impeller 6 to form an anti-rotation rear cavity 14 for coating the final-stage impeller 6.

Based on the structure, the multistage centrifugal pump provided by the application is provided with the first anti-rotation front cavity 11, the second anti-rotation front cavity 12, the third anti-rotation front cavity 13 and the anti-rotation rear cavity 14, and the anti-rotation front cavity and the anti-rotation rear cavity are arranged to obviously reduce the liquid rotation driven by the rotation of the impeller, so that the hydraulic loss caused by the liquid rotation is reduced, the efficiency of the water pump is improved, the consumption of the water pump is reduced, and the energy is saved; furthermore, the reduction of liquid rotation can also reduce the vibration of the water pump, thereby being beneficial to improving the stability of the water pump and ensuring the normal operation of the water pump.

Further, as shown in fig. 2, in some embodiments of the present application, the water inlet section 1 is further provided with a first connection hole 43, a backflow hole 44, a backflow ring 45, a flushing hole 46, and a flushing ring 47, the backflow ring 45 cooperates with the guide vane 3 and the primary impeller 2 to form the backflow cavity 29, and the flushing ring 47 cooperates with the sliding bearing 37 and the sliding shaft sleeve 35 to form the flushing cavity 34; as shown in fig. 3, the water outlet section 7 is provided with a second connection hole 48, a pressure relief hole 49, a pressure relief ring 50 and a balance ring 51, the balance ring 51 cooperates with the balance hub 15 and the last-stage impeller 6 to form the balance cavity 32, and the pressure relief ring 50 cooperates with the balance hub 15 and the machine seal seat 16 to form the pressure relief cavity 33; as shown in fig. 1, the sliding bearing 37 cooperates with the sliding sleeve 35 and the sliding bearing cover 40 to form a lubrication chamber 39, and the sliding bearing cover 40 is provided with a return groove 41.

As shown in fig. 1, the sliding bearing 37 is installed in the sliding bearing cover 40, the round nut 22 is screwed on the pump shaft 36, the sliding shaft sleeve 35 is sleeved on the pump shaft 36, the snap ring 38 is clamped on the pump shaft 36 and then is matched with the sliding shaft sleeve 35, and the round nut 22 is screwed to the sliding shaft sleeve 35 and then is locked and fixed; the sliding bearing cover 40 is matched with the flushing ring 47 and then is arranged on the water inlet section 1, the water inlet section 1 is fixedly arranged on the bottom plate 52, and the sliding shaft sleeve 35 is matched with the sliding bearing 37 after the pump shaft 36 passes through the water inlet section 1; the first-stage impeller 2 is matched with the circular nut 22 and the water inlet section 1 after passing through the pump shaft 36, the guide vane 3 is matched with the first-stage impeller 2 and the water inlet section 1 after passing through the pump shaft 36, the middle section 4 is matched with the guide vane 3 and the water inlet section 1 after passing through the pump shaft 36, the second-stage impeller 5 is matched with the first-stage impeller 2, the guide vane 3 is matched with the middle section 4 after passing through the pump shaft 36, the middle section 4 is matched with the guide vane 3 and the middle section 4, the last-stage impeller 6 is matched with the second-stage impeller 5, the guide vane 3 is matched with the middle section 4 after passing through the pump shaft 36, the balance hub 15 is matched with the last-stage impeller 6 and the middle section 4 after passing through the pump shaft 36, and the water inlet section 1, the middle section 4, the water outlet section 7 and the guide vane 3 are locked and fixed together by the pull rod 42.

As shown in fig. 1, the washer 28 is engaged with the balance hub 15 through the pump shaft 36, the mechanical seal holder 16 is installed on the water outlet section 7, the integrated mechanical seal 17 is engaged with the mechanical seal holder 16 through the pump shaft 36, the shaft sleeve 18 is engaged with the integrated mechanical seal 17 through the pump shaft 36, the bearing end cover 19 is installed and fixed on the bearing box bracket 26, and the bearing box bracket 26 is installed and fixed on the water outlet section 7 after the bearing end cover 19 is engaged with the shaft sleeve 18 and the mechanical seal holder 16 through the pump shaft 36; the bearing 20 is installed on the bush 21, the bush 21 is matched with the shaft sleeve 18 through the pump shaft 36, meanwhile, the bearing 20 is matched with the bearing box support 26 and the bearing end cover 19, the round nut 22 is matched with the bush 21 through the pump shaft 36, and the bush 21, the shaft sleeve 18, the cartridge type mechanical seal 17, the gasket 28, the balance hub 15, the last-stage impeller 6, the secondary impeller 5, the first-stage impeller 2 and the round nut 22 are locked and fixed together by rotating the round nut 22.

The cartridge type mechanical seal 17 is fixed on the mechanical seal base 16, the bearing gland 27 is matched with the bearing 20 and the bearing box bracket 26 through the pump shaft 36 and then is locked and fixed, and the pump coupler 23 is installed on the pump shaft 36.

Further, the balance pipe 30 is installed on play water section 7 and the section of intaking 1, washes lubricated pipe 31 and installs on collection dress formula machine seals 17 and slide bearing cover 40, and the electricity federation 25 is installed on motor 24, makes electricity federation 25 and pump antithetical couplet 23 cooperation after motor 24 and the cooperation of bearing box support 26 fix and form the multistage centrifugal pump of this application on bearing box support 26.

The container type machine seal 17 is communicated with the lubricating cavity 39 through a flushing lubricating pipe 31, the balance cavity 32 is communicated with the pressure relief cavity 33 through a balance ring 51, the pressure relief cavity 33 is communicated with the backflow cavity 29 through a pressure relief hole 49, the balance pipe 30 and a backflow hole 44, the backflow cavity 29 is communicated with the flushing cavity 34 through a flushing hole 46, and the flushing cavity 34 is communicated with the lubricating cavity 39 through a backflow groove 41.

Based on the structure, the integrated mechanical seal 17 is communicated with the lubricating cavity 39, so that high-pressure liquid of the integrated mechanical seal can flow into the lubricating cavity 39 to fully lubricate the sliding bearing 37, the return cavity 29 is communicated with the flushing cavity 34 and then communicated with the lubricating cavity 39, the high-pressure liquid can flow into the lubricating cavity 39 to fully flush and lubricate the sliding bearing 37, the service life of the sliding bearing 37 is prolonged, and the service life of the pump is prolonged, and the use cost is reduced; the balance cavity 32 is communicated with the pressure relief cavity 33 and then communicated with the return cavity 29, so that high-pressure liquid can flow into the return cavity 29, the rotor of the pump is lifted upwards through the front cover plate of the first-stage impeller 2 and can flow into the guide vane 3 for recycling, the work of the motor 24 is saved by recycling the liquid, the efficiency of the pump is improved, the axial force of the pump is balanced by the balance cavity 32 and the balance hub 15, the axial force of the pump is balanced again by upwards lifting the rotor of the pump through the high-pressure liquid backflow, the operation safety and reliability of the water pump are improved, the service life of the pump is prolonged, the operation, maintenance and repair costs of the pump are reduced, and the operation safety of the water pump is improved.

It should be noted that the multistage centrifugal pump of the present application needs to be mounted on a pump base by a fitting before use to ensure proper operation of the multistage centrifugal pump. Specifically, in some embodiments of the present application, the assembly includes a bottom plate 52 disposed horizontally, a through hole 54 and a bolt 55 are disposed on the bottom plate 52, the bolt 55 passes through the first connection hole 43 to realize the fixed connection between the pump body and the bottom plate 52, and the bottom plate 52 is fixedly connected to the pump foundation through the through hole 54, that is, the multistage centrifugal pump of the present application is fixed to the pump foundation through the bottom plate 52 and the bolt 55. Certainly, for some special working conditions such as the surface of a ship, etc., the vibration value of the water pump needs to be further limited, at this time, in order to reduce the vibration condition of the water pump, the assembly further includes a supporting plate 53 perpendicular to the bottom plate 52, the supporting plate 53 is also provided with a bolt 55 and a through hole 54, the bolt 55 passes through the second butt hole 48 to realize the fixed connection of the pump body of the water pump and the supporting plate 53, the supporting plate 53 is also fixedly connected with the pump foundation through the through hole 54, that is, the multistage centrifugal pump is fixed on the pump foundation through the bottom plate 52, the supporting plate 53 and the bolt 55 at this time. So, the strenghthened type assembly part that is equipped with fagging 53 can satisfy the installation demand that multistage centrifugal pump installed in special application occasion, and the operation vibration value of multistage centrifugal pump after the installation is accomplished is little, and the assembly part that bottom plate 52 and fagging 53 constitute has promoted the operation fail safe nature of pump, has reduced operation, maintenance and the cost of maintenance of pump.

In summary, the utility model provides a multistage centrifugal pump, which comprises a water inlet section, a first-stage impeller, a guide vane, a middle section, a second-stage impeller, a last-stage impeller, a water outlet section, a balance hub and a machine seal seat, the integrated mechanical seal, the pump shaft, the sliding bearing cover, the sliding bearing, the sliding shaft sleeve, the bearing box support, the coupling and the motor, wherein the water inlet section is provided with a water inlet anti-rotation rib, the water outlet section is provided with a water outlet anti-rotation rib, the middle section is provided with a middle anti-rotation rib, the water inlet anti-rotation rib is matched with the guide vane, the first-stage impeller and the water inlet section to form a first anti-rotation front cavity for coating the first-stage impeller, the middle anti-rotation rib is matched with the guide vane, the secondary impeller and the middle section to form a second anti-rotation front cavity for coating the secondary impeller, the middle anti-rotation rib is matched with the final-stage impeller and the water outlet section to form a third anti-rotation front cavity for coating the final-stage impeller, and the water outlet anti-rotation rib is matched with the final-stage impeller to form an anti-rotation rear cavity for coating the final-stage impeller. Compared with the prior art, the multistage centrifugal pump is provided with a first anti-rotation front cavity, a second anti-rotation front cavity, a third anti-rotation front cavity and an anti-rotation rear cavity, and the anti-rotation front cavity and the anti-rotation rear cavity are arranged to remarkably reduce liquid rotation driven by rotation of an impeller, so that hydraulic loss caused by liquid rotation is reduced, the efficiency of the water pump is improved, the consumption of the water pump is reduced, and energy is saved; furthermore, the reduction of liquid rotation can also reduce the vibration of the water pump, thereby being beneficial to improving the stability of the water pump and ensuring the normal operation of the water pump.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (6)

1. A multistage centrifugal pump is characterized by comprising a water inlet section, a first-stage impeller, a guide vane, a middle section, a second-stage impeller, a last-stage impeller, a water outlet section, a balance hub, a machine seal seat, a container type machine seal, a pump shaft, a sliding bearing cover, a sliding bearing, a sliding shaft sleeve, a bearing box support, a coupling and a motor, wherein the water inlet section is provided with a water inlet anti-rotation rib, the water outlet section is provided with a water outlet anti-rotation rib, the middle section is provided with a middle anti-rotation rib, the water inlet anti-rotation rib is matched with the guide vane, the first-stage impeller and the water inlet section to form a first anti-rotation front cavity for coating the first-stage impeller, the middle anti-rotation rib is matched with the guide vane, the second-rotation front cavity for coating the second-stage impeller and the middle section to form a second anti-rotation front cavity for coating the last-stage impeller, the water outlet anti-rotation rib is matched with the final-stage impeller to form an anti-rotation rear cavity for coating the final-stage impeller.

2. The multistage centrifugal pump according to claim 1, wherein the water inlet section is further provided with a first connection hole, a backflow ring, a flushing hole and a flushing ring, the backflow ring is matched with the guide vane and the first-stage impeller to form a backflow cavity, and the flushing ring is matched with the sliding bearing and the sliding shaft sleeve to form a flushing cavity.

3. The multistage centrifugal pump of claim 2, wherein the water outlet section is further provided with a second docking hole, a pressure relief ring and a balance ring, the balance ring cooperates with the balance hub and the last stage impeller to form a balance cavity, and the pressure relief ring cooperates with the balance hub and the machine seal seat to form a pressure relief cavity.

4. The multistage centrifugal pump of claim 3, wherein said sliding bearing cooperates with said sliding bushing and said sliding bearing cap to form a lubrication cavity, and a backflow groove is provided on the sliding bearing cap.

5. The multistage centrifugal pump according to claim 4, wherein said cartridge type mechanical seal is communicated with said lubrication cavity through a flushing lubrication pipe, said balance cavity is communicated with said pressure relief cavity through said balance ring, said pressure relief cavity is communicated with said back flow cavity through a balance pipe, said pressure relief hole and said back flow hole, said back flow cavity is communicated with said flushing cavity through said flushing hole, and said flushing cavity is communicated with said lubrication cavity through said back flow groove.

6. The multistage centrifugal pump according to claim 1 or 5, further comprising an assembly member including a horizontally disposed bottom plate and a stay plate perpendicular to the bottom plate, the bottom plate and the stay plate each having a bolt and a through hole.

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