Impeller and centrifugal pump

Abstract

The application discloses a kind of impeller and centrifugal pump, the impeller includes wheel disc, wheel disc is equipped with shaft hole, wheel disc is equipped with multiple blade groups, multiple blade groups are arranged around shaft hole;Blade group includes first blade and second blade, first blade and second blade are all arranged along wheel disc radial, first blade and second blade are all equipped with bending pressure boost output part near wheel disc edge position, and the end of first blade pressure boost output part and the end of second blade pressure boost output part are close to each other, to make wheel disc in positive and negative rotation can be through blade group pressure boost output.Liquid is exported by the present application to the structure optimization of the blade of traditional impeller, first blade and second blade are oppositely arranged, the pressure boost output part of first blade and second blade is opposite in rotation direction, realizes that effective one-way outflow function can be realized when impeller bidirectional rotation.

Description

Technical Field

[0001] This invention belongs to the field of pump technology, specifically relating to an impeller and a centrifugal pump. Background Technology

[0002] Centrifugal pumps are common pumps that play a vital role in petrochemical, water conservancy and irrigation, aerospace, and marine industries. Therefore, improving the efficiency of centrifugal pumps is of great application value. Centrifugal pumps rely on the rapid rotation of an impeller to throw liquid from the center of the impeller outwards through centrifugal force. At this point, the liquid pressure on the outer side of the impeller increases, forcing the liquid out through pre-designed channels or orifices to achieve the purpose of liquid transportation. To improve the efficiency of centrifugal pumps, existing technologies design the impeller blades in a vortex shape, such as the impeller and centrifugal pump disclosed in Chinese patent document CN217633088U. In this case, the impeller's rotation direction is related to the impeller's rotation direction, allowing only unidirectional rotation. While the vortex-structured impeller works effectively in unidirectional rotation, this solution cannot adequately meet the requirements of applications requiring bidirectional rotation.

[0003] Without a vortex-structured impeller, the blades are straight. While this can meet the requirements of bidirectional rotation applications, the liquid transport function is poor, making it difficult to guarantee the transport effect. Therefore, it is necessary for those skilled in the art to propose an impeller and centrifugal pump that can rotate bidirectionally with unidirectional outflow, to overcome the shortcomings of existing technologies that cannot simultaneously achieve both bidirectional rotation and unidirectional outflow, thus enabling the impeller to rotate bidirectionally while ensuring efficient outflow. Summary of the Invention

[0004] The purpose of this invention is to provide an impeller and a centrifugal pump to solve the aforementioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an impeller, including a disk, the disk having a shaft hole, and multiple blade groups arranged around the shaft hole; the blade groups include a first blade and a second blade, both the first blade and the second blade being arranged radially along the disk, and both the first blade and the second blade having a bent pressurization output section near the edge of the disk, with the ends of the pressurization output sections of the first blade and the second blade being close to each other, so that the impeller can pressurize and output liquid through the blade group when rotating in both directions.

[0006] As an optional implementation of the above technical solution, the bending position of the booster output section is recessed inward to form an arc-shaped groove.

[0007] As an optional implementation of the above technical solution, both the first blade and the second blade are provided with a guide tip at the end near the shaft hole.

[0008] As an optional implementation of the above technical solution, the first blade and the second blade are provided with a first arc-shaped convex surface on their opposite sides, and the first blade and the second blade are provided with a second arc-shaped convex surface on their opposite sides. The connection between the first arc-shaped convex surface and the second arc-shaped convex surface forms the guide tip.

[0009] As an optional implementation of the above technical solution, the blade group further includes a third blade, one end of which extends into the flow channel between the first blade and the second blade.

[0010] As an optional implementation of the above technical solution, the end of the third blade that extends into the guide channel is provided with a pointed end.

[0011] As an optional embodiment of the above technical solution, the wheel has an annular step in the middle, the shaft hole is provided in the middle of the annular step, and the third blade is provided on the annular step.

[0012] As an optional implementation of the above technical solution, the flow channel includes a contraction section, an expansion section and a booster output section connected in sequence, with one end of the third blade extending to the contraction section.

[0013] On the other hand, the present invention adopts the following technical solution: a centrifugal pump, including the above-mentioned impeller, and also including a housing and a power shaft. The housing is provided with an inlet, an outlet and a mounting hole. The impeller is rotatably disposed inside the housing. One end of the power shaft passes through the mounting hole and is connected to the impeller.

[0014] As an optional embodiment of the above technical solution, the outer casing is provided with an impeller groove adapted to the impeller, and the periphery of the impeller groove is provided with a guide groove communicating with the liquid outlet. A plurality of self-adjusting guide vanes are provided at intervals in the guide groove, and the self-adjusting guide vanes are used to guide the liquid in the guide groove to flow unidirectionally toward the liquid outlet.

[0015] As an optional implementation of the above technical solution, the self-adjusting guide vane includes a long vane and a short vane, with an intermediate connecting part between the long vane and the short vane. The intermediate connecting part is rotatably engaged with the guide groove. The long vane is located on the side of the intermediate connecting part closer to the liquid outlet, and the short vane is located on the side of the intermediate connecting part away from the liquid outlet.

[0016] As an optional implementation of the above technical solution, the intermediate connecting part includes an intermediate connecting column, and a blade seat is provided in the guide groove. The blade seat is rotatably connected to the intermediate connecting column.

[0017] As an optional implementation of the above technical solution, the guide channel is provided with a self-adjusting gate assembly near the liquid outlet. The self-adjusting gate assembly is used to automatically adjust the flow direction of the liquid according to the liquid pressure on both sides.

[0018] As an optional implementation of the above technical solution, the self-adjusting gate assembly includes a self-adjusting gate and a gate seat. One end of the self-adjusting gate is rotatably connected to the gate seat. The self-adjusting gate can move in the guide groove according to the liquid pressure on both sides of it to close the channel between one side of the self-adjusting gate and the liquid outlet, and open the channel between the other side of the self-adjusting gate and the liquid outlet.

[0019] As an optional embodiment of the above technical solution, the outer shell includes a base and a cover plate. The impeller groove and the guide groove are provided on the inner side of the base. The liquid outlet is provided on the side wall of the base, and the liquid inlet is provided on the end face of the base. The cover plate is installed on the base, and the mounting hole is provided on the end face of the cover plate.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention optimizes the structure of the blades of a traditional impeller, with the first and second blades arranged opposite to each other and the booster output sections of the first and second blades rotating in opposite directions, thus achieving effective unidirectional outflow function even when the impeller rotates in both directions.

[0022] 2. This invention solves the problem that the large inertial force of liquid rotating bidirectionally with the impeller will affect the efficiency of liquid centrifugation. By automatically adjusting the flow of the reverse flow through the self-adjusting guide vanes, the influence of inertial force on the efficiency of liquid centrifugation is reduced, thereby improving the efficiency of fluid centrifugation.

[0023] 3. The present invention solves the problem that the prior art cannot effectively guide the flow in both directions when facing a bidirectional rotating impeller by means of a self-adjusting gate assembly. The self-adjusting gate assembly can adjust its angle to achieve bidirectional flow guidance under different pressures generated by different flow directions, thus preventing liquid backflow. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the impeller structure in one embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of a centrifugal pump according to one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the base structure in one embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of a self-adjusting guide vane in one embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a self-adjusting gate in one embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram showing the positions of the self-adjusting guide vanes and the self-adjusting gate assembly when the impeller rotates counterclockwise in one embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram showing the positions of the self-adjusting guide vanes and the self-adjusting gate assembly when the impeller rotates clockwise in one embodiment of the present invention.

[0031] In the diagram: 1-Disc; 2-Shaft hole; 3-First blade; 4-Second blade; 5-Boosting output section; 6-Guide tip; 7-Third blade; 8-Annular step; 9-Outer shell; 10-Power shaft; 11-Inlet; 12-Outlet; 13-Mounting hole; 14-Impeller groove; 15-Guide groove; 16-Self-adjusting guide blade; 17-Long blade; 18-Short blade; 19-Intermediate connecting column; 20-Blade seat; 21-Self-adjusting gate assembly; 22-Self-adjusting gate; 23-Gate seat; 24-Base; 25-Cover plate. Detailed Implementation

[0032] like Figure 1 As shown, this embodiment provides an impeller, including a disk 1. A shaft hole 2 is formed in the center of the disk 1, and multiple blade groups are evenly arranged around the shaft hole 2 on the disk 1. The number of blade groups can be set according to specific needs, and this invention does not limit this. Specifically, the blade groups include a first blade 3 and a second blade 4, both arranged radially along the disk 1. Both the first blade 3 and the second blade 4 have bent pressurization output sections 5 near the edge of the disk 1, and the ends of the pressurization output sections 5 of the first blade 3 and the second blade 4 are close to each other, so that the disk 1 can pressurize and output liquid through the blade groups when rotating in both directions.

[0033] A flow guide channel is provided between the first blade 3 and the second blade 4. A first drainage channel is provided between two adjacent first blades 3, and a second drainage channel is provided between two adjacent second blades 4. The first blades 3 and the second blades 4 adopt the same structure and are arranged opposite to each other. The booster output section 5 of the first blades 3 and the second blades 4 rotate in opposite directions. Therefore, the impeller can achieve a good pumping effect on the liquid in both forward and reverse rotation, ensuring the outflow effect. The bend in the booster output section 5 is recessed inward to form an arc-shaped groove, which is beneficial for liquid output.

[0034] To reduce the resistance to liquid outflow, both the first blade 3 and the second blade 4 are provided with a guide tip 6 at one end near the shaft hole 2. Specifically, the opposing sides of the first blade 3 and the second blade 4 are provided with a first arc-shaped convex surface, and the opposite sides of the first blade 3 and the second blade 4 are provided with a second arc-shaped convex surface. The guide tip 6 is formed at the connection between the first arc-shaped convex surface and the second arc-shaped convex surface.

[0035] like Figure 1 As shown, in this embodiment, the blade assembly further includes a third blade 7. One end of the third blade 7 extends into the flow channel between the first blade 3 and the second blade 4, and the end of the third blade 7 extending into the flow channel has a pointed tip. The flow channel includes a contraction section, an expansion section, and a pressurization output section connected in sequence, and one end of the third blade 7 extends to the contraction section. The impeller 1 has an annular step 8 in the middle, and a shaft hole 2 is provided in the middle of the annular step 8. The third blade 7 is positioned on the annular step 8, which facilitates smooth water discharge. This invention places the third blade 7 between the first blade 3 and the second blade 4, making the blade distribution more reasonable and the water discharge more convenient and smooth. The principle remains the same when the impeller rotates in both directions; the drainage efficiency is the same and will not decrease.

[0036] like Figure 2 As shown, this embodiment also provides a centrifugal pump, including the aforementioned impeller, a housing 9, and a drive shaft 10. The housing 9 has an inlet 11, an outlet 12, and a mounting hole 13. The impeller is rotatably disposed inside the housing 9. One end of the drive shaft 10 passes through the mounting hole 13 and is connected to the shaft hole 2 of the impeller. The other end of the drive shaft 10 is connected to a motor, which drives the impeller to rotate. Liquid enters the housing 9 through the inlet 11 and is discharged through the outlet 12 under the action of the impeller, thus achieving the purpose of liquid transportation. This patent, based on the traditional impeller, arranges the first blade 3 and the second blade 4 opposite to each other on the impeller 1, solving the problem of bidirectional rotation and efficient liquid transportation.

[0037] like Figure 3As shown, in this embodiment, the outer casing 9 has an impeller groove 14 adapted to the impeller inside. An annular guide groove 15 is provided around the impeller groove 14, communicating with the liquid outlet 12. Multiple self-adjusting guide vanes 16 are spaced apart within the guide groove 15. The self-adjusting guide vanes 16 guide the liquid in the guide groove 15 to flow unidirectionally towards the liquid outlet 12. When the liquid flows forward along the guide groove 15, the direction of the self-adjusting guide vanes 16 is consistent with the liquid flow direction under the pressure of the liquid. When the liquid flows in the reverse direction, the self-adjusting guide vanes 16 rotate under the pressure of the liquid, and both ends of the self-adjusting guide vanes 16 contact the inner wall of the guide groove 15, sealing the guide groove 15 and thus preventing the liquid from flowing in the reverse direction. This invention utilizes the design of self-adjusting guide vanes 16 on both sides of the guide channel 15 to obstruct the reverse flow while allowing the forward flow to proceed normally. When the impeller frequently changes its rotation direction, it reduces energy loss caused by inertial forces, allowing the internal liquid to rapidly change direction and enhancing the efficiency of the bidirectional centrifugal pump. The length and height of the self-adjusting guide vanes 16 can be set to different dimensions according to specific needs. For example, the height of each self-adjusting guide vane 16 can be designed as a stepped height according to the liquid flow direction of the guide channel 15. Correspondingly, the width and depth of the guide channel 15 can be set to different dimensions according to specific needs.

[0038] like Figure 4 As shown, specifically, the self-adjusting guide vane 16 includes a long vane 17 and a short vane 18, with an intermediate connecting portion between the long vane 17 and the short vane 18. The intermediate connecting portion is rotatably engaged with the guide groove 15. The long vane 17 is located on the side of the intermediate connecting portion closer to the liquid outlet 12, and the short vane 18 is located on the side of the intermediate connecting portion away from the liquid outlet 12. The intermediate connecting portion includes an intermediate connecting post 19, and a vane seat 20 is provided inside the guide groove 15. The vane seat 20 is rotatably connected to the intermediate connecting post 19.

[0039] In one specific embodiment, a self-adjusting gate assembly 21 is provided near the liquid outlet 12 in the flow guide trough 15. The self-adjusting gate assembly 21 is used to automatically adjust the flow direction of the liquid according to the liquid pressure on both sides. When the liquid pressure on the left side of the self-adjusting gate assembly 21 is greater than the liquid pressure on the right side, the self-adjusting gate assembly 21 moves to the right, allowing the liquid on the left side to enter the liquid outlet 12; when the liquid pressure on the right side of the self-adjusting gate assembly 21 is greater than the liquid pressure on the left side, the self-adjusting gate assembly 21 moves to the left, allowing the liquid on the right side to enter the liquid outlet 12. The self-adjusting gate assembly 22 of the present invention can automatically adjust its rotation direction under different pressure differences caused by different fluid flow directions, achieving the purpose of bidirectional rotational unidirectional flow guidance.

[0040] Specifically, such as Figure 3 and Figure 5As shown, the self-adjusting gate assembly 21 includes a self-adjusting gate 22 and a gate seat 23. One end of the self-adjusting gate 22 is rotatably connected to the gate seat 23. The self-adjusting gate 22 can move within the guide channel 15 according to the liquid pressure on both sides of it, thereby closing the channel between one side of the self-adjusting gate 22 and the liquid outlet 12, and opening the channel between the other side of the self-adjusting gate 22 and the liquid outlet 12. The gate seat 23 is arranged opposite to the liquid outlet 12. The self-adjusting gate 22 is rotatably disposed within the guide channel 15. According to the liquid pressure on both sides of the self-adjusting gate 22, the self-adjusting gate 22 can rotate left and right, thereby controlling the opening and closing of the channel between the guide channel 15 and the liquid outlet 12.

[0041] In this embodiment, the outer casing 9 includes a base 24 and a cover plate 25. An impeller groove 14 and a guide groove 15 are provided on the inner side of the base 24. An outlet 12 is provided on the side wall of the base 24, and an inlet 11 is provided on the end face of the base 24. The cover plate 25 is installed on the base 24, and an installation hole 13 is provided on the end face of the cover plate 25.

[0042] This invention provides a bidirectional rotary unidirectional outflow high-efficiency axial centrifugal pump. An impeller groove 14 is formed at the center of the base 24, and a guide groove 15 is formed on the outer side of the impeller groove 14. An outlet 12 is formed on one side of the base 24, and an inlet 11 is formed at the lower end of the base 24 opposite to the center of the impeller groove 14. An impeller is rotatably mounted inside the impeller groove 14. The lower end of the impeller has a disc-shaped structure that rotatably engages with the impeller groove 14. A blade assembly is provided on the upper side of the impeller. The booster output section 5 of the first blade 3 and the second blade 4 of the blade assembly rotates in opposite directions. Multiple blade seats 2 are spaced apart around the impeller groove 14 within the guide groove 15. 0. A gate seat 23 is provided on the side of the guide channel 15 near the liquid outlet 12. A self-adjusting guide vane 16 is rotatably provided on the upper side of the vane seat 20. The self-adjusting guide vane 16 has an arc-shaped structure with one end being longer and the other end being relatively shorter. The longer end of the self-adjusting guide vane 16 is closer to the liquid outlet 12. A self-adjusting gate 22 is rotatably provided on the upper side of the gate seat 23. The self-adjusting gate 22 can be rotated to both sides of the liquid outlet 12. A power shaft 10 is connected to the upper end of the impeller center. A shaft hole 2 is opened in the center of the impeller. A cover plate 25 is installed on the upper end of the base 24. The power shaft 10 passes through the mounting hole 13 in the center of the cover plate 25 and is connected to the impeller.

[0043] like Figure 6 and Figure 7As shown, the working principle of the centrifugal pump is as follows: When the centrifugal pump is working, the power shaft 10 drives the impeller to rotate, and the impeller drives the liquid entering the center of the impeller from the liquid inlet 11 to rotate. Under the centrifugal action, the liquid gradually moves towards the edge of the impeller. Since the impeller is equipped with the first blade 3, the second blade 4 and the third blade 7, the centrifugal pump can achieve a good pumping effect in both directions of rotation. When the liquid reaches the guide channel 15 on the outside of the impeller, it flows within the guide channel 15 along the current rotation direction of the impeller. While the liquid flows within the guide channel 15, the short blade 18 of the self-adjusting guide vanes 16 on one side of the guide channel 15 points in the direction of liquid inflow. Since the self-adjusting guide vanes 16 on this side cannot maintain a balanced state, the long blade 17 and short blade 18 rotate to press against the side wall of the guide channel 15, thus obstructing the liquid flow. On the other side of the guide channel 15, the long blade 17 of the self-adjusting guide vanes 16 points in the direction of liquid outflow, and the long blade 17 and short blade 18 do not obstruct the liquid flow as it passes through. Simultaneously, the self-adjusting gate 22 rotates to the other side under the influence of liquid pressure, ensuring that the liquid can flow smoothly out of the outlet 12. When the power shaft 10 rotates in the opposite direction, the states of the self-adjusting guide vanes 16 on both sides are reversed, and the self-adjusting gate 22 turns to the other side of the outlet 12, ensuring that the liquid flows smoothly out.

[0044] Existing centrifugal pumps capable of bidirectional rotation rely solely on the pressure outside the impeller to force liquid out through pre-set channels during discharge. The fluid velocity itself, following the impeller's rotation, does not contribute to fluid outflow. On the contrary, due to the impeller's bidirectional rotation, the fluids interfere with each other under inertia. This interference is even more pronounced in high-power, large-volume centrifugal pumps. To address these shortcomings of the existing technology, this invention utilizes a self-adjusting gate assembly 21 to automatically adjust the liquid flow direction, ensuring the fluid moves in one direction and preventing interference from inertia.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. This invention optimizes the structure of the blades of a traditional impeller, with the first blade 3 and the second blade 4 arranged opposite to each other, and the booster output section 5 of the first blade 3 and the second blade 4 rotating in opposite directions, thus realizing an effective unidirectional outflow function when the impeller rotates in both directions.

[0047] 2. This invention solves the problem that the large inertial force of liquid rotating bidirectionally with the impeller will affect the efficiency of liquid centrifugation. By automatically adjusting the flow of the self-adjusting guide vanes 16 to hinder the flow of the reverse flow, the influence of inertial force on the efficiency of liquid centrifugation is reduced, thereby improving the efficiency of fluid centrifugation.

[0048] 3. The present invention solves the problem that the prior art cannot effectively guide the flow in both directions when facing a bidirectional rotating impeller by means of the self-adjusting gate assembly 21. The self-adjusting gate assembly 21 can adjust its angle on its own under the different pressures generated by different flow directions to achieve bidirectional flow guidance and prevent liquid backflow.

[0049] In the description of this invention, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. They can refer to fixed connections, detachable connections, or integral connections; they can be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this invention. Furthermore, the specific features and structures described in the embodiments are included in at least one implementation method. Those skilled in the art can combine features from different implementation methods without contradiction. The scope of protection of this invention is not limited to the specific implementation methods described above. Based on the basic technical concept of this invention, implementation methods that can be conceived by those skilled in the art without creative effort are all within the scope of protection of this invention.

Claims

1. A centrifugal pump, characterized in that, The impeller includes a disk (1), the disk (1) having a shaft hole (2), and multiple blade groups arranged around the shaft hole (2). The blade groups are characterized in that the blade groups include a first blade (3) and a second blade (4), both the first blade (3) and the second blade (4) being arranged radially along the disk (1). Both the first blade (3) and the second blade (4) have bent boosting output sections (5) near the edge of the disk (1), and the ends of the boosting output sections (5) of the first blade (3) and the second blade (4) are close to each other, so that the disk (1) can boost the liquid through the blade groups for output when rotating in both directions. The centrifugal pump also includes a housing (9) and a power shaft (10). The housing (9) is provided with an inlet (11), an outlet (12) and a mounting hole (13). The impeller is rotatably disposed inside the housing (9). One end of the power shaft (10) passes through the mounting hole (13) and is connected to the impeller. The outer casing (9) has an impeller groove (14) adapted to the impeller inside. The impeller groove (14) has a guide groove (15) connected to the liquid outlet (12) on its periphery. The guide groove (15) has a number of self-adjusting guide blades (16) spaced apart inside. The self-adjusting guide blades (16) are used to guide the liquid in the guide groove (15) to flow unidirectionally toward the liquid outlet (12). The self-adjusting guide vane (16) includes a long vane (17) and a short vane (18). An intermediate connecting part is provided between the long vane (17) and the short vane (18). The intermediate connecting part is rotatably engaged with the guide groove (15). The long vane (17) is located on the side of the intermediate connecting part closer to the liquid outlet (12), and the short vane (18) is located on the side of the intermediate connecting part away from the liquid outlet (12). The intermediate connecting part includes an intermediate connecting column (19). A vane seat (20) is provided in the guide groove (15). The vane seat (20) is rotatably connected to the intermediate connecting column (19).

2. The centrifugal pump according to claim 1, characterized in that, The guide channel (15) is provided with a self-adjusting gate assembly (21) near the liquid outlet (12). The self-adjusting gate assembly (21) is used to automatically adjust the flow direction of the liquid according to the liquid pressure on both sides.

3. The centrifugal pump according to claim 2, characterized in that, The self-adjusting gate assembly (21) includes a self-adjusting gate (22) and a gate seat (23). One end of the self-adjusting gate (22) is rotatably connected to the gate seat (23). The self-adjusting gate (22) can move in the guide groove (15) according to the liquid pressure on both sides of it to close the channel between one side of the self-adjusting gate (22) and the liquid outlet (12), and open the channel between the other side of the self-adjusting gate (22) and the liquid outlet (12).

4. The centrifugal pump according to claim 1, characterized in that, The outer casing (9) includes a base (24) and a cover plate (25). The impeller groove (14) and the guide groove (15) are provided on the inner side of the base (24). The liquid outlet (12) is provided on the side wall of the base (24). The liquid inlet (11) is provided on the end face of the base (24). The cover plate (25) is installed on the base (24). The mounting hole (13) is provided on the end face of the cover plate (25).

5. The centrifugal pump according to claim 1, characterized in that, The bending position of the boost output section (5) is recessed inward and forms an arc-shaped groove; the first blade (3) and the second blade (4) are both provided with a guide tip (6) at the end near the shaft hole (2); the first blade (3) and the second blade (4) are both provided with a first arc-shaped convex surface on the opposite side, and the first blade (3) and the second blade (4) are both provided with a second arc-shaped convex surface on the opposite side, and the guide tip (6) is formed at the connection between the first arc-shaped convex surface and the second arc-shaped convex surface.

6. The centrifugal pump according to claim 1, characterized in that, The blade assembly also includes a third blade (7), one end of which extends into the flow channel between the first blade (3) and the second blade (4); the end of the third blade (7) extending into the flow channel is provided with a tip.

7. The centrifugal pump according to claim 6, characterized in that, The wheel (1) has an annular step (8) in the middle, and the shaft hole (2) is provided in the middle of the annular step (8). The third blade (7) is provided on the annular step (8). The flow channel includes a contraction section, an expansion section and a booster output section connected in sequence. One end of the third blade (7) extends to the contraction section.

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