Large-flow high-lift wear-resistant multi-stage centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to a large-flow high-lift wear-resistant multi-stage centrifugal pump which comprises an outer shell and a driving motor, and a plurality of pressurizing mechanisms and pumping mechanisms are arranged in the outer shell. Through the multiple pressurizing mechanisms, water flow is pressurized in each stage, the overall lift of the system can be effectively improved, the pumping mechanism is connected with the pressurizing mechanisms through the pump shafts, the pumping efficiency of the pressurizing mechanisms is matched with that of the pressurizing mechanisms, and efficient fluid conveying can be achieved when the multi-stage centrifugal pump works; the problems of energy loss and flow instability are reduced to the maximum extent, each pressurizing mechanism is provided with a liquid inlet pipe, water can be injected into the multiple pressurizing mechanisms at the same time, it is ensured that the pump can smoothly receive liquid, the pump body can be more rapidly filled with water through the combined design of the multiple pressurizing mechanisms and the pumping mechanism, and the water filling efficiency is improved. The irrigation efficiency is remarkably improved, the preparation time can be shortened, and the overall efficiency of the system is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pump production, and particularly to a large-flow high-head wear-resistant multistage centrifugal pump. Background Art

[0002] A centrifugal pump is a water pumping machine that utilizes the centrifugal motion of water. A single-stage centrifugal pump has a simple structure and is suitable for low-head applications; while a multistage centrifugal pump can achieve high head and large flow by connecting multiple impellers in series, while maintaining high efficiency and a wide operating range. The multistage design of centrifugal pumps is compact and adaptable, and is widely used in high-rise water supply, industrial processes, fire protection systems and other applications.

[0003] The multistage centrifugal pump with the publication number CN114810610A includes an inlet section, a first-stage impeller, a guide vane, a middle section, a secondary impeller, a last-stage impeller, and an outlet section. The inlet section is provided with an inlet anti-rotation rib, the outlet section is provided with an outlet anti-rotation rib, and the middle section is provided with a middle anti-rotation rib. The inlet anti-rotation rib cooperates with the guide vane, the first-stage impeller and the inlet section to form a first pre-rotation prevention cavity. The middle anti-rotation rib cooperates with the guide vane, the secondary impeller and the middle section to form a second pre-rotation prevention cavity. The middle anti-rotation rib cooperates with the last-stage impeller and the outlet section to form a third pre-rotation prevention cavity. The outlet anti-rotation rib cooperates with the last-stage impeller to form a post-rotation prevention cavity. Compared with the prior art, this multistage centrifugal pump significantly reduces the rotation of the liquid driven by the impeller rotation by setting the pre-rotation prevention cavity and the post-rotation prevention cavity, reduces the hydraulic loss caused by the liquid rotation, and improves the efficiency of the water pump; the reduction of the liquid rotation can also reduce the vibration of the water pump, which is beneficial to improving the stability of the water pump and ensuring the normal operation of the water pump. Since the centrifugal pump should be filled with water before starting, after starting, the rotating impeller drives the water in the pump to rotate at a high speed, and the water makes a centrifugal motion, is thrown outwards and is pressed into the outlet pipe. However, the water filling method of these existing multistage centrifugal pumps for multistage centrifugal pumps has a low water filling efficiency and cannot quickly fill the multiple stages inside the centrifugal pump, wasting a lot of preparation time in the early stage of using the multistage centrifugal pump. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, the water filling efficiency is low, the multiple stages inside the centrifugal pump cannot be quickly filled, and a lot of preparation time is wasted in the early stage of using the multistage centrifugal pump. A large-flow high-head wear-resistant multistage centrifugal pump is provided. Through the combined design of multiple pressurizing mechanisms and pumping mechanisms, the pump body can be filled with water more quickly, the water filling efficiency can be significantly improved, the preparation time can be reduced, and the overall efficiency of the system can be significantly improved.

[0005] To achieve the above object, a large-flow high-head wear-resistant multistage centrifugal pump proposed by the present invention includes: a housing and a driving motor. A plurality of pressurizing mechanisms and pumping mechanisms are arranged inside the housing. The pressurizing mechanisms and the pumping mechanisms are both connected to a pump shaft. One end of the pump shaft is connected to the driving motor. A liquid inlet pipe is arranged on each of the pressurizing mechanisms, and a liquid outlet pipe is connected to the housing. The pressurizing mechanism includes a first protective shell, and a pressurizing impeller and a pressurizing guide vane are arranged inside the protective shell.

[0006] As a further description of the above technical solution: A plurality of long blades and a plurality of short blades are arranged on the pressurizing guide vane. Each short blade is arranged between adjacent long blades. A shaft hole is formed in the middle of the pressurizing guide vane, and a bearing is arranged inside the shaft hole.

[0007] As a further description of the above technical solution: The pumping mechanism includes a second protective shell, and a pumping impeller and a pumping guide vane are arranged inside the second protective shell. The pumping guide vane has the same structure as the pressurizing guide vane.

[0008] As a further description of the above technical solution: A plurality of openings are formed in the pressurizing guide vane, and the plurality of openings are evenly distributed around the shaft hole.

[0009] As a further description of the above technical solution: A plurality of balance columns are arranged on the pressurizing guide vane. The balance columns are arranged on the pressurizing guide vane at equal intervals, and a cavity is formed inside the balance columns.

[0010] As a further description of the above technical solution: A driving shaft is arranged at one end of the driving motor. The driving shaft is adapted to the pump shaft. A shaft sleeve is sleeved outside the driving shaft, and a hole groove is formed on the driving shaft.

[0011] As a further description of the above technical solution: A liquid outlet hole and a liquid return hole are formed in the housing, and a limiting rod adapted to the shaft sleeve is arranged on the housing.

[0012] As a further description of the above technical solution: Axial grooves are formed inside the shaft sleeve. The axial grooves are serpentine grooves. A liquid inlet hole is arranged above the axial grooves, and a liquid discharge hole is arranged below the axial grooves.

[0013] As a further description of the above technical solution: A through groove is formed inside the pump shaft. The through groove is communicated with the driving end of the driving shaft. A plurality of through holes are formed on the pump shaft. The through holes are located inside the bearing, and a plurality of diversion grooves are formed inside the bearing.

[0014] As a further description of the above technical solution: A fixed seat is arranged outside the drive motor, and multiple groups of locking blocks are arranged on the side surfaces of the outer housing and the fixed seat. A sealing rod is installed on the multiple groups of locking blocks, and the outer housing is axially locked by the locking blocks through the sealing rod to achieve the sealed installation of the outer housing.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] 1. Through multiple pressurizing mechanisms in the present invention, the water flow is pressurized at each stage, which can effectively improve the overall head of the system. The pumping mechanism and the pressurizing mechanism are connected by a pump shaft, and the pumping efficiency of each pressurizing mechanism is coordinated with each other, enabling efficient fluid transportation during the operation of the multistage centrifugal pump, minimizing energy loss and flow instability problems to the greatest extent. An inlet pipe is arranged on each pressurizing mechanism, and multiple pressurizing mechanisms can be filled with water simultaneously to ensure that the pump can receive the liquid smoothly. By adopting the combined design of multiple pressurizing mechanisms and pumping mechanisms, the inside of the pump body can be filled with water more quickly, significantly improving the filling efficiency, reducing the preparation time, increasing the starting speed, and significantly enhancing the overall efficiency of the system. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a multistage centrifugal pump in an embodiment of the present invention;

[0018] Figure 2 It is an internal schematic diagram of a multistage centrifugal pump in an embodiment of the present invention;

[0019] Figure 3 It is a sectional view of a multistage centrifugal pump in an embodiment of the present invention;

[0020] Figure 4 is Figure 2 a schematic structural diagram of the pressurizing mechanism in

[0021] Figure 5 is Figure 3 a schematic structural diagram of the shaft sleeve in

[0022] Figure 6 is Figure 4 a schematic structural diagram of the pressurizing guide vane in

[0023] Figure 7 is Figure 3 a schematic structural diagram of the pump shaft in

[0024] Figure 8 is Figure 4 a sectional view of the pump shaft in

[0025] Legend Explanation:

[0026] 1. Outer housing; 2. Driving motor; 3. Boosting mechanism; 4. Pumping mechanism; 5. Pump shaft; 6. Liquid inlet pipe; 7. Liquid outlet pipe; 8. Driving shaft; 9. Bush; 10. Liquid outlet hole; 11. Liquid return hole; 12. Limiting rod; 13. Axial groove; 14. Liquid inlet hole; 15. Drain hole; 16. Through groove; 17. Through hole; 18. Flow guiding groove; 19. Hole groove; 20. Fixed seat; 21. Locking block; 22. Sealing rod; 31. First protective housing; 32. Boosting impeller; 33. Boosting guide vane; 331. Long blade; 332. Short blade; 333. Shaft hole; 334. Bearing; 335. Opening; 336. Balance column; 337. Cavity; 41. Second protective housing; 42. Pumping impeller; 43. Pumping guide vane. Detailed implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Please refer to Figures 1-8 , the present invention provides a technical solution: The large-flow high-head wear-resistant multi-stage centrifugal pump of the present invention includes an outer housing 1 and a driving motor 2. A plurality of boosting mechanisms 3 and pumping mechanisms 4 are arranged inside the outer housing 1. The boosting mechanisms 3 and the pumping mechanisms 4 are both connected to the pump shaft 5. One end of the pump shaft 5 is connected to the driving motor 2. A liquid inlet pipe 6 is arranged on each boosting mechanism 3, and a liquid outlet pipe 7 is connected to the outer housing 1; The boosting mechanism 3 includes a first protective housing 31, and a boosting impeller 32 and a boosting guide vane 33 are arranged inside the first protective housing 31.

[0031] In the technical solution of the present invention, through multiple pressurizing mechanisms 3, the water flow is pressurized in each stage, which can effectively improve the overall head of the system. The pumping mechanism 4 is connected to the pressurizing mechanism 3 through a pump shaft, and the pumping efficiencies of each pressurizing mechanism 4 cooperate with each other, enabling efficient fluid transportation during the operation of the multistage centrifugal pump, minimizing energy loss and flow instability problems to the greatest extent. Each pressurizing mechanism 3 is provided with a liquid inlet pipe 6, which can fill water into multiple pressurizing mechanisms 3 simultaneously, ensuring that the pump can smoothly receive the liquid and can adapt to the requirements of different liquid flow rates. The outer casing 1 is connected with a liquid outlet pipe 7, enabling the liquid to be discharged from the pump smoothly. By adopting the combined design of multiple pressurizing mechanisms 3 and pumping mechanisms 4, compared with the traditional single pumping method, the pump body can be filled with water more quickly, significantly improving the water filling efficiency, reducing the preparation time, increasing the starting speed, and significantly enhancing the overall efficiency of the system.

[0032] As Figure 2 and Figure 4 shown, the pressurizing guide vane 33 is provided with multiple long vanes 331 and multiple short vanes 332. Each short vane 332 is arranged between adjacent long vanes 331. A shaft hole 333 is formed in the middle of the pressurizing guide vane 33, and a bearing 334 is arranged inside the shaft hole 333; the pressurizing mechanism 3 includes a first protective shell 31, inside which a pressurizing impeller 32 and a pressurizing guide vane 33 are arranged. The pressurizing guide vane 33 is provided with multiple long vanes 331 and multiple short vanes 332, and each short vane 332 is cleverly arranged between adjacent long vanes 331. Through the structure of alternating long and short vanes, the liquid flow can be guided more effectively, the flow field distribution can be optimized, the turbulence and energy loss of the liquid during the flow process can be reduced, thereby improving the pressurizing effect.

[0033] Among them, multiple openings 335 are formed in the pressurizing guide vane 33, and the multiple openings 335 are evenly distributed around the shaft hole 333; a shaft hole 333 is formed in the middle of the pressurizing guide vane 33, and a bearing 334 is installed inside the shaft hole 333, enabling the pump shaft 5 to smoothly pass through and drive the pressurizing impeller 32 and the pressurizing guide vane 33 to rotate stably. In addition, multiple openings 335 are also formed in the pressurizing guide vane 33 and are evenly distributed around the shaft hole 333. These openings can further adjust the flow rate and flow direction of the liquid, assisting in optimizing the hydraulic performance in the flow channel.

[0034] Specifically, a plurality of balance columns 336 are provided on the booster guide vane 33. The balance columns 336 are arranged at equal intervals on the booster guide vane 33, and a cavity 337 is formed inside the balance column 336. A plurality of balance columns 336 are arranged at equal intervals on the booster guide vane 33, and a cavity 337 is formed inside the balance column 336, which helps to balance the centrifugal force generated by the booster guide vane 33 during high-speed rotation, reduce vibration and wear, and improve the operating stability. At the same time, when the guide vane is overhauled, glue is filled into the cavity 337 of the balance column 336 at the lighter part until the guide vane reaches balance. By adding glue to balance through the cavity 337, there is no need to machine and cut the guide vane, which will not cause damage to the guide vane itself and is convenient and quick to install.

[0035] As Figure 2 and Figure 4 shown, the pumping mechanism 4 includes a second protective shell 41. Inside the second protective shell 41, a pumping impeller 42 and a pumping guide vane 43 are arranged. The pumping guide vane 43 has the same structure as the booster guide vane 33. The pumping mechanism 4 is composed of the second protective shell 41, the internal pumping impeller 42 and the pumping guide vane 43, and the pumping guide vane 43 has the same structure as the booster guide vane 33, which is convenient for production and manufacturing and later maintenance. At the same time, it can also ensure that during the whole pumping process, the liquid can be guided and processed similarly and efficiently at different stages, ensuring the stable overall performance of the pump.

[0036] As Figure 5 and Figure 6 shown, one end of the drive motor 2 is provided with a drive shaft 8. The drive shaft 8 is adapted to the pump shaft 5. An axle sleeve 9 is sleeved outside the drive shaft 8. A hole groove 19 is formed on the drive shaft 8. A liquid outlet hole 10 and a liquid return hole 11 are formed on the outer shell 1. A limiting rod 12 adapted to the axle sleeve 9 is arranged on the outer shell 1. Axial grooves 13 are formed inside the axle sleeve 9. The axial grooves 13 are serpentine grooves. A liquid inlet hole 14 is arranged above the axial grooves 13, and a liquid discharge hole 15 is arranged below the axial grooves 13. The axial grooves 13 inside the axle sleeve 9 are serpentine grooves and are provided with a liquid inlet hole 14 and a liquid discharge hole 15. When the liquid flows from the liquid outlet hole 10 into the serpentine axial grooves 13 through the liquid inlet hole 14, a stable liquid film can be formed between the axle sleeve 9 and the drive shaft 8. This liquid film can not only play a lubricating role, reduce the direct friction between the two, but also take away the heat generated by the friction, playing a cooling effect, thereby reducing the wear speed of the components. The axle sleeve 9 and the drive shaft 8 are closely matched. Coupled with the adaptation of the limiting rod 12 on the outer shell 1 to the axle sleeve 9, it can ensure that the installation position of the axle sleeve 9 is accurate and stable. This close cooperation relationship helps to prevent liquid leakage, ensure the stable internal pressure of the multi-stage pump, and enable the pump to work more efficiently. At the same time, the stable internal pressure also reduces the impact wear on the components caused by pressure fluctuations.

[0037] Specifically, the hole groove 19 on the drive shaft 8 cooperates with the liquid outlet hole 10 and the liquid return hole 11 on the outer housing 1, enabling the liquid inside the multi-stage pump to form a cycle. The liquid discharged from the liquid discharge hole 15 can enter the pump again through the liquid return hole 11, and after processes such as pressurization, it is discharged from the liquid outlet hole 10. This cycling method can make full use of the liquid and avoid the aggravation of local wear caused by liquid stagnation.

[0038] As Figure 7 and Figure 8 shown, a through groove 16 is opened inside the pump shaft 5. The through groove 16 communicates with the driving end of the drive shaft 8. A plurality of through holes 17 are opened on the pump shaft 5. The through holes 17 are located inside the bearing 334, and a plurality of flow guiding grooves 18 are opened inside the bearing 334. The through groove 16, the through holes 17, and the flow guiding grooves 18 cooperate with each other, enabling the liquid to enter the flow guiding grooves 18 of the bearing 334 from the driving end of the drive shaft 8 through the through groove 16 and the through holes 17. This can provide good lubrication and cooling for the bearing, reduce the friction and wear of the bearing, extend its service life, and thus ensure the stability and reliability of the rotation of the pump shaft. The liquid flowing in the through groove, the through holes, and the flow guiding grooves can, to a certain extent, balance the axial force generated during the operation of the pump. Because a large axial force will be generated during the operation of the multi-stage pump, this structure helps to reduce the influence of the axial force on the bearing and other components, and reduces the wear risk of the components caused by the axial force.

[0039] Among them, a protective sleeve or a sealing ring and other structures are arranged on the outer side of the bearing 334 or at the part where the pump shaft 5 cooperates with the bearing to prevent impurities in the liquid from entering the inside of the bearing, and at the same time, it can also play a certain protective role for the bearing and the pump shaft, reducing the possibility of wear.

[0040] Specifically, the pumping guide vane 43 and the pressurizing guide vane 33 have the same structure, which not only reduces the cost and difficulty in the production and manufacturing process, but also facilitates replacement and maintenance during later maintenance, improves the maintenance efficiency, and reduces the maintenance cost. The flow channel layout of each component inside the pump is reasonable, and the liquid circulation path is clear. When performing maintenance and repair, it is convenient for the staff to understand and troubleshoot faults, further improving the convenience of maintenance.

[0041] As Figure 1 and Figure 3As shown in the figure, a fixed seat 20 is provided outside the drive motor 2. Multiple locking blocks 21 are provided on the side surfaces of the outer housing 1 and the fixed seat 20. A sealing rod 22 is installed on the multiple locking blocks 21. The sealing rod 22 axially locks the outer housing 1 through the locking blocks 21 to achieve the sealed installation of the outer housing 1. The sealed installation method of axially locking the outer housing 1 through the locking blocks 21 and the sealing rod 22, as well as the cooperation between the shaft sleeve 9 and the limiting rod 12, ensure the good sealing performance of the outer housing 1, prevent liquid leakage, and ensure that the pump can operate safely and stably under high-pressure environments. At the same time, the drive motor 2 is firmly fixed through the fixed seat 20, which also provides guarantee for the stable operation of the entire pump.

[0042] Working principle: The large-flow, high-head wear-resistant multi-stage centrifugal pump of the present invention mainly consists of core components such as an outer housing 1, a drive motor 2, multiple pressurizing mechanisms 3, a pumping mechanism 4, and a pump shaft 5. The drive motor 2 provides the power source for the operation of the entire pump. The outer housing 1, as a key part for protecting and accommodating internal components, is connected with a liquid outlet pipe 7 for discharging the pressurized liquid. Inside the outer housing 1, multiple pressurizing mechanisms 3 and pumping mechanisms 4 are arranged in an orderly manner, and they are all connected to the pump shaft 5. One end of the pump shaft 5 is connected to the drive motor 2, so that when the drive motor 2 operates, it drives the pump shaft 5 to rotate, and then drives the pressurizing mechanism 3 and the pumping mechanism 4 to work. When the drive motor 2 is started, the drive shaft 8 drives the pump shaft 5 to rotate at a high speed. The rotation of the pump shaft 5 causes the pressurizing impeller 32 and the pumping impeller 42 connected to it to rotate synchronously. In the pressurizing mechanism 3, the liquid enters the first protective shell 31 from the liquid inlet pipe 6. The high-speed rotating pressurizing impeller 32 applies centrifugal force to the liquid, enabling the liquid to obtain a higher speed and kinetic energy. Subsequently, the liquid enters the pressurizing guide vane 33. The long blades 331 and short blades 332 of the pressurizing guide vane 33 guide and decelerate the liquid, converting the kinetic energy of the liquid into pressure energy to achieve the pressurization of the liquid. During this process, the openings 335 and balance columns 336 on the pressurizing guide vane 33 work together to optimize the flow field and balance the centrifugal force. A part of the pressurized liquid is discharged through the liquid outlet pipe 7, and the other part enters the axial groove 13 through the liquid outlet hole 10 and the liquid inlet hole 14 on the shaft sleeve 9, and then returns to the next-stage pressurizing mechanism 3 or pumping mechanism 4 for re-pressurization and transportation through the drain hole 15, the through groove 16 and through hole 17 of the pump shaft 5, and the diversion groove 18 and return hole 11 of the bearing 334. In the pumping mechanism 4, the working principle is similar to that of the pressurizing mechanism 3. The pumping impeller 42 accelerates the liquid, and the pumping guide vane 43 converts the kinetic energy into pressure energy to further increase the pressure of the liquid, ensuring that the liquid can be transported with a large flow rate and a high head.

[0043] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0044] The preferred embodiments of the present invention disclosed above are only used to assist in the description of the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A large-flow high-head wear-resistant multistage centrifugal pump, characterized in that, It includes a housing (1) and a driving motor (2). Inside the housing (1), there are multiple pressurizing mechanisms (3) and pumping mechanisms (4). The pressurizing mechanisms (3) and the pumping mechanisms (4) are both connected to a pump shaft (5). One end of the pump shaft (5) is connected to the driving motor (2). Each pressurizing mechanism (3) is provided with a liquid inlet pipe (6), and a liquid outlet pipe (7) is connected to the housing (1). The pressurizing mechanism (3) includes a first protective housing (31). Inside the first protective housing (31), there is a pressurizing impeller (32) and a pressurizing guide vane (33).

2. The large-flow high-head wear-resistant multistage centrifugal pump according to claim 1, wherein: The pressurizing guide vane (33) is provided with multiple long blades (331) and multiple short blades (332). Each short blade (332) is arranged between adjacent long blades (331). A shaft hole (333) is opened in the middle of the pressurizing guide vane (33), and a bearing (334) is arranged inside the shaft hole (333).

3. The high-flow high-head wear-resistant multistage centrifugal pump according to claim 1, characterized in that: The pumping mechanism (4) includes a second protective housing (41). Inside the second protective housing (41), there is a pumping impeller (42) and a pumping guide vane (43). The pumping guide vane (43) has the same structure as the pressurizing guide vane (33).

4. The large-flow high-head wear-resistant multistage centrifugal pump according to claim 2, wherein: Multiple openings (335) are opened in the pressurizing guide vane (33), and the multiple openings (335) are evenly distributed around the shaft hole (333).

5. The large-flow high-head wear-resistant multistage centrifugal pump according to claim 2, wherein: The pressurizing guide vane (33) is provided with multiple balance columns (336). The balance columns (336) are arranged at equal intervals on the pressurizing guide vane (33), and a cavity (337) is opened inside the balance columns (336).

6. The high-flow and high-head wear-resistant multi-stage centrifugal pump according to claim 1, characterized in that: One end of the driving motor (2) is provided with a driving shaft (8). The driving shaft (8) is adapted to the pump shaft (5), and a shaft sleeve (9) is sleeved outside the driving shaft (8).

7. The large-flow high-head wear-resistant multi-stage centrifugal pump according to claim 1, characterized in that: A liquid outlet hole (10) and a liquid return hole (11) are opened on the housing (1), and a limiting rod (12) adapted to the shaft sleeve (9) is arranged on the housing (1).

8. The large-flow high-head wear-resistant multistage centrifugal pump according to claim 6, characterized in that: Axial grooves (13) are opened inside the shaft sleeve (9). The axial grooves (13) are serpentine grooves. A liquid inlet hole (14) is arranged above the axial grooves (13), and a liquid discharge hole (15) is arranged below the axial grooves (13).

9. The large-flow high-head wear-resistant multi-stage centrifugal pump according to claim 6, characterized in that: A through groove (16) is opened inside the pump shaft (5). The through groove (16) is communicated with the driving end of the driving shaft (8). Multiple through holes (17) are opened on the pump shaft (5), and the through holes (17) are located inside the bearing (334).

10. The high-flow high-head wear-resistant multi-stage centrifugal pump according to claim 1, characterized in that: A fixing seat (20) is arranged outside the driving motor (2). Multiple groups of locking blocks (21) are arranged on the side surfaces of the housing (1) and the fixing seat (20). A sealing rod (22) is installed on the multiple groups of locking blocks (21). The sealing rod (22) axially locks the housing (1) through a locking block (23) to realize the sealed installation of the housing (1).

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