Low-lift high-flow axial flow pump

Abstract

The invention discloses a low-lift large-flow axial flow pump which comprises a pump shell, a driving motor, a rotating shaft, a fixed guide vane, an impeller and a water guide cone. The impeller comprises an impeller base and a plurality of blade units, each blade unit comprises a first blade, a second blade, a third blade and a mounting base, and the second blades and the third blades are fixed to the first blades and formed through 3D printing. According to the axial flow pump, the multiple blades are spliced, the casting structure and the 3D printing structure are spliced, and therefore the 3D printing part can be arranged to be of a bionic structure. According to the axial flow pump, the casting part and the impeller seat are connected more stably, the multiple blades are spliced and installed stably, and the locking parts used for locking are not exposed to the surfaces of the blades, so that adverse effects on flowing of fluid are avoided. The axial flow pump can be conveniently detected and maintained subsequently, whether the bolt is loosened or not can be conveniently detected, and the detection and maintenance efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, and more specifically, to a low-head, high-flow-rate axial flow pump. Background Technology

[0002] An axial flow pump is a type of pump that uses the force generated by the blades of a rotating impeller to transport liquid along its axis. It features high flow rate and low head, and is widely used in agricultural irrigation, urban drainage, and power plant circulating water transportation. During operation, the impeller rotates at high speed driven by a motor, and the blades transfer mechanical energy to the liquid flowing through the pump, giving the liquid a thrust along its axis and thus transporting it out. Axial flow pumps have a relatively simple structure, are easy to maintain, and have high operating efficiency, playing a vital role in various fields such as water conservancy projects, municipal construction, and the power industry.

[0003] Axial flow pumps have advantages in low-head, high-flow-rate applications. For some large axial flow pump impellers, the blades are too large to be manufactured in a single piece and need to be pieced together. This is especially true for blades with biomimetic structures (such as tiny grooves and protrusions), which cannot be achieved through traditional casting processes and can only be created using 3D printing. However, 3D printing has size limitations, so multiple blades must be pieced together to form a single blade. While this method solves the size limitation problem, it places higher demands on the strength and stability of the joints, and also requires certain testing capabilities, which are sometimes difficult to achieve with current technology. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a low-head, high-flow axial flow pump.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an axial flow pump, comprising a pump casing, a drive motor, a rotating shaft driven by the drive motor, fixed guide vanes mounted on the pump casing, an impeller mounted on the rotating shaft, and a guide cone mounted on the rotating shaft; the impeller includes an impeller seat and a plurality of blade units mounted on the impeller seat, each blade unit including a first blade, a second blade, a third blade, and a mounting base fixedly connected to the first blade, the second blade and the third blade being fixedly attached to the first blade, the mounting base and the first blade being integrally cast, and the second blade and the third blade being 3D printed.

[0006] Furthermore, both the second and third blades have biomimetic structures.

[0007] By incorporating biomimetic structures at the second and third blades, it is possible to achieve functions such as optimizing the flow field and reducing drag; stabilizing pressure distribution and preventing cavitation caused by excessively low local pressure; suppressing eddies and flow separation; and reducing pressure pulsation for smoother and more reliable operation.

[0008] Furthermore, the impeller seat has a mounting groove, the mounting groove has a mounting through hole, the mounting base is embedded in the mounting groove and has a mounting countersunk hole, the mounting countersunk hole and the mounting through hole are fitted together and fixedly connected by bolts and nuts.

[0009] Furthermore, the number of mounting grooves and blade units is three.

[0010] Furthermore, the three mounting grooves are distributed in a ring at equal intervals, each mounting groove has four mounting through holes, and each mounting base has four mounting countersunk holes.

[0011] Further, the first blade includes a connecting seat fixedly connected to the mounting base and a first blade plate fixedly connected to the connecting seat, the mounting base having a first groove; the second blade includes a second blade plate and a protruding seat fixedly connected to the second blade plate, the second blade plate having a stepped groove and a second groove for accommodating the first blade plate; the third blade includes a third blade plate and an extension plate fixedly connected to the third blade plate and cooperating with the stepped groove, the third blade plate having a third groove for accommodating the first blade plate; the first groove has a plurality of first countersunk holes, a plurality of second countersunk holes, and a plurality of third countersunk holes, the first blade plate has a plurality of first embedding grooves communicating with the first countersunk holes and a plurality of second embedding grooves communicating with the second countersunk holes, the second blade plate has a first protrusion embedded in the first embedding groove and a second protrusion embedded in the second embedding groove, the third blade plate has a third protrusion embedded in the first embedding groove, the first protrusion having a through channel, the third... The protrusion has a first threaded channel, the second protrusion has a second threaded channel, and the protruding seat has multiple third threaded channels communicating with a third countersunk hole; a first locking component is installed at the first countersunk hole, the first locking component including a first nut, a limiting rod passing through the through channel, and a first screw cooperating with the first threaded channel; a second locking component is installed at the second countersunk hole, the second locking component including a second nut and a second screw cooperating with the second threaded channel; a third locking component is installed at the third countersunk hole, the third locking component including a third nut and a third screw cooperating with the third threaded channel; the extension plate has multiple insertion protrusions, the insertion protrusions having first threaded holes; the stepped groove has multiple insertion through holes into which the insertion protrusions are inserted; a fourth locking component is installed at the first threaded hole, the fourth locking component including a fourth nut and a fourth screw cooperating with the first threaded hole; the first blade plate has multiple receiving blind holes for receiving the fourth nut.

[0012] Furthermore, the first nut, the second nut, the third nut, and the fourth nut each have a sealing ring, each receiving blind hole has an annular sealing gasket held between the first blade plate and the second blade plate, and the mounting base has a sealing frame surrounding the first groove.

[0013] The sealing performance is improved by using sealing rings, annular sealing gaskets, and sealing frames.

[0014] Furthermore, each receiving blind hole is connected to the first groove via a connecting channel.

[0015] Furthermore, the mounting base has a second threaded hole communicating with the first groove and a fourth groove communicating with the second threaded hole. A sealing bolt is installed at the second threaded hole. The sealing bolt includes a fifth nut and a fifth screw fixed to the fifth nut. The fifth nut has a sealing ring that abuts against the fourth groove.

[0016] Furthermore, the number of the insertion protrusion, the insertion through hole, and the receiving blind hole are equal; there are nine receiving blind holes.

[0017] Furthermore, there are three first embedding slots and two second embedding slots, with the three first embedding slots and two second embedding slots alternating; there are three first protrusions and three third protrusions, and two second protrusions, with the three first protrusions and two second protrusions alternating.

[0018] Furthermore, both the first and second embedding grooves have curved surfaces; the first, second, and third protrusions also have curved surfaces.

[0019] This allows for a better fit between the protrusion and the embedded groove.

[0020] Furthermore, the sealing ring, annular sealing gasket, and sealing frame are all made of rubber material.

[0021] Furthermore, the first blade plate has a plurality of first positioning blind holes and a plurality of second positioning blind holes, the second blade plate has a plurality of first positioning protrusions that cooperate with the first positioning blind holes, and the third blade plate has a plurality of second positioning protrusions that cooperate with the second positioning blind holes.

[0022] This allows for the accurate positioning of the first blade and the second and third blades.

[0023] This application also discloses an impeller, including an impeller seat and a plurality of blade units mounted on the impeller seat. The blade unit includes a first blade, a second blade, a third blade, and a mounting base fixedly connected to the first blade. The second blade and the third blade are both fixed to the first blade. The mounting base and the first blade are integrally cast. The second blade and the third blade are both 3D printed.

[0024] Furthermore, the impeller seat has a mounting groove, the mounting groove has a mounting through hole, the mounting base is embedded in the mounting groove and has a mounting countersunk hole, the mounting countersunk hole and the mounting through hole are fitted together and fixedly connected by bolts and nuts.

[0025] Furthermore, the number of mounting grooves and blade units is three; the three mounting grooves are distributed in a ring with equal spacing, each mounting groove has four mounting through holes, and each mounting seat has four mounting countersunk holes.

[0026] Further, the first blade includes a connecting seat fixedly connected to the mounting base and a first blade plate fixedly connected to the connecting seat, the mounting base having a first groove; the second blade includes a second blade plate and a protruding seat fixedly connected to the second blade plate, the second blade plate having a stepped groove and a second groove for accommodating the first blade plate; the third blade includes a third blade plate and an extension plate fixedly connected to the third blade plate and cooperating with the stepped groove, the third blade plate having a third groove for accommodating the first blade plate; the first groove has a plurality of first countersunk holes, a plurality of second countersunk holes, and a plurality of third countersunk holes, the first blade plate has a plurality of first embedding grooves communicating with the first countersunk holes and a plurality of second embedding grooves communicating with the second countersunk holes, the second blade plate has a first protrusion embedded in the first embedding groove and a second protrusion embedded in the second embedding groove, the third blade plate has a third protrusion embedded in the first embedding groove, the first protrusion having a through channel, the third... The protrusion has a first threaded channel, the second protrusion has a second threaded channel, and the protruding seat has multiple third threaded channels communicating with a third countersunk hole; a first locking component is installed at the first countersunk hole, the first locking component including a first nut, a limiting rod passing through the through channel, and a first screw cooperating with the first threaded channel; a second locking component is installed at the second countersunk hole, the second locking component including a second nut and a second screw cooperating with the second threaded channel; a third locking component is installed at the third countersunk hole, the third locking component including a third nut and a third screw cooperating with the third threaded channel; the extension plate has multiple insertion protrusions, the insertion protrusions having first threaded holes; the stepped groove has multiple insertion through holes into which the insertion protrusions are inserted; a fourth locking component is installed at the first threaded hole, the fourth locking component including a fourth nut and a fourth screw cooperating with the first threaded hole; the first blade plate has multiple receiving blind holes for receiving the fourth nut.

[0027] Furthermore, the first nut, second nut, third nut, and fourth nut each have a sealing ring, each blind hole has an annular sealing gasket held between the first blade plate and the second blade plate, and the mounting base has a sealing frame surrounding the first groove; each blind hole communicates with the first groove through a connecting channel; the mounting base has a second threaded hole communicating with the first groove and a fourth groove communicating with the second threaded hole, a sealing bolt is installed at the second threaded hole, the sealing bolt includes a fifth nut and a fifth threaded rod fixed to the fifth nut, and the fifth nut has a sealing ring abutting against the fourth groove.

[0028] Furthermore, the number of the insertion protrusion, the insertion through hole, and the receiving blind hole are equal; there are nine receiving blind holes.

[0029] Furthermore, there are three first embedding slots and two second embedding slots, with the three first embedding slots and two second embedding slots alternating; there are three first protrusions and three third protrusions, and two second protrusions, with the three first protrusions and two second protrusions alternating.

[0030] This allows the first, second, and third blades to fit together more securely and tightly, effectively enhancing the strength and stability of the overall structure. Simultaneously, this alternating distribution of insert grooves and protrusions provides excellent positioning during installation, significantly improving accuracy and efficiency.

[0031] Furthermore, both the first and second embedding grooves have curved surfaces; the first, second, and third protrusions also have curved surfaces.

[0032] Furthermore, the sealing ring, annular sealing gasket, and sealing frame are all made of rubber material.

[0033] Furthermore, the first blade plate has a plurality of first positioning blind holes and a plurality of second positioning blind holes, the second blade plate has a plurality of first positioning protrusions that cooperate with the first positioning blind holes, and the third blade plate has a plurality of second positioning protrusions that cooperate with the second positioning blind holes.

[0034] This allows for the accurate positioning of the first blade and the second and third blades.

[0035] Beneficial effects:

[0036] 1) The axial flow pump of this application has multiple blades spliced ​​together, and a cast structure and a 3D printed structure spliced ​​together, so that the 3D printed part can be set to have a biomimetic structure.

[0037] 2) In the axial flow pump of this application, the connection between the cast part and the impeller seat is more secure, and the multiple blades are spliced ​​and installed stably. Furthermore, the locking parts used for locking are not exposed on the surface of the blades, so as not to have an adverse effect on the flow of fluid.

[0038] 3) The axial flow pump of this application facilitates subsequent inspection and maintenance of the axial flow pump, and makes it easy to check whether the bolts are loose, which greatly improves the efficiency of inspection and maintenance. Attached Figure Description

[0039] Figure 1 A first-view schematic diagram showing the separation of one of the blade unit components;

[0040] Figure 2 This is a magnified view of region A;

[0041] Figure 3 This is a magnified view of region B.

[0042] Figure 4 This is a magnified view of region C;

[0043] Figure 5 A second-view diagram showing the separation of one of the blade unit components;

[0044] Figure 6 This is a magnified view of region D;

[0045] Figure 7 This is a magnified view of region E.

[0046] Figure 8 This is a magnified view of region F;

[0047] Figure 9 This is a magnified view of region G;

[0048] Figure 10 A third-view diagram showing the separation of one of the blade unit components;

[0049] Figure 11 This is a magnified view of region H;

[0050] Figure 12 A schematic diagram showing the second and third blades after they are fixedly connected.

[0051] Figure 13 This is a magnified view of region I;

[0052] Figure 14 This is a schematic diagram showing the first, second, and third blades after they are fixedly connected.

[0053] Figure 15 This is a magnified view of region J.

[0054] Figure 16 Schematic diagram of the impeller;

[0055] Figure 17 This is a magnified view of region K.

[0056] Explanation of reference numerals in the attached drawings: Impeller seat 1; Mounting groove 1.1; Mounting through hole 1.2; First blade 2; Connecting seat 2.1; First blade plate 2.2; Accommodating blind hole 2.2.1; Connecting channel 2.2.2; First positioning blind hole 2.2.3; Second positioning blind hole 2.2.4; First embedding groove 2.3; Second embedding groove 2.4; Annular sealing gasket 2.5; Second blade 3; Second blade plate 3.1; Protruding seat 3.2; Third threaded channel 3.2.1; Stepped groove 3.3; Insertion through hole 3.3.1; Second groove 3.4; First protrusion 3.5; Through channel 3.5.1; Second protrusion 3.6; Second threaded channel 3.6.1; First Positioning protrusion 3.7; Third blade 4; Third blade plate 4.1; Extension plate 4.2; Third groove 4.3; Third protrusion 4.4; First threaded channel 4.4.1; Insertion protrusion 4.5; Second positioning protrusion 4.6; Mounting base 5; Mounting countersunk hole 5.1; First groove 5.2; First countersunk hole 5.3; Second countersunk hole 5.4; Third countersunk hole 5.5; Sealing frame 5.6; Second threaded hole 5.7; Fourth groove 5.8; First nut 6.1; Limiting rod 6.2; First screw 6.3; Second nut 7.1; Second screw 7.2; Third nut 8.1; Third screw 8.2; Fourth nut 9.1; Fourth screw 9.2; Sealing bolt 10. Detailed Implementation

[0057] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0058] This invention provides a low-head, high-flow axial flow pump, as shown in the figure, comprising an impeller seat 1 and multiple blade units mounted on the impeller seat 1. Each blade unit includes a first blade 2, a second blade 3, a third blade 4, and a mounting base 5 fixedly connected to the first blade 2. The second blade 3 and the third blade 4 are both fixed to the first blade 2. The mounting base 5 and the first blade 2 are integrally cast, while the second blade 3 and the third blade 4 are 3D printed. The impeller seat 1 has a mounting groove 1.1, and the mounting groove 1.1 has a mounting through hole 1.2. The mounting base 5 is embedded in the mounting groove 1.1 and has a mounting countersunk hole 5.1. The mounting countersunk hole 5.1 and the mounting through hole 1.2 are fitted together and fixedly connected by bolts and nuts. There are three mounting grooves 1.1 and three blade units; the three mounting grooves 1.1 are distributed in a ring with equal spacing, each mounting groove 1.1 has four mounting through holes 1.2, and each mounting base 5 has four mounting countersunk holes 5.1.

[0059] The first blade 2 includes a connecting seat 2.1 fixedly connected to the mounting base 5 and a first blade plate 2.2 fixedly connected to the connecting seat 2.1. The mounting base 5 has a first groove 5.2. The second blade 3 includes a second blade plate 3.1 and a protruding seat 3.2 fixedly connected to the second blade plate 3.1. The second blade plate 3.1 has a stepped groove 3.3 and a second groove 3.4 for accommodating the first blade plate 2.2. The third blade 4 includes a third blade plate 4.1 and an extension plate 4.2 fixedly connected to the third blade plate 4.1 and cooperating with the stepped groove 3.3. The third blade plate 4.1 has a first blade plate 2.2 for accommodating the first blade plate 2. The first blade plate 2.2 has a third groove 4.3; the first groove 5.2 has a plurality of first countersunk holes 5.3, a plurality of second countersunk holes 5.4, and a plurality of third countersunk holes 5.5; the first blade plate 2.2 has a plurality of first embedding grooves 2.3 communicating with the first countersunk holes 5.3 and a plurality of second embedding grooves 2.4 communicating with the second countersunk holes 5.4; the second blade plate 3.1 has a first protrusion 3.5 embedded in the first embedding groove 2.3 and a second protrusion 3.6 embedded in the second embedding groove 2.4; the third blade plate 4.1 has a third protrusion 4.4 embedded in the first embedding groove 2.3; the first protrusion 3.5 has a through channel 3.5.1; the third... The protrusion 4.4 has a first threaded channel 4.4.1, the second protrusion 3.6 has a second threaded channel 3.6.1, and the protruding seat 3.2 has multiple third threaded channels 3.2.1 communicating with the third countersunk hole 5.5; a first locking component is installed at the first countersunk hole 5.3, the first locking component including a first nut 6.1, a limiting rod 6.2 passing through the through channel 3.5.1, and a first screw 6.3 cooperating with the first threaded channel 4.4.1; a second locking component is installed at the second countersunk hole 5.4, the second locking component including a second nut 7.1 and a second screw 7.2 cooperating with the second threaded channel 3.6.1. A third locking component is installed at the third countersunk hole 5.5, the third locking component including a third nut 8.1 and a third screw 8.2 that mates with the third threaded channel 3.2.1; the extension plate 4.2 has multiple insertion protrusions 4.5, each insertion protrusion 4.5 having a first threaded hole; the stepped groove 3.3 has multiple insertion through holes 3.3.1 into which the insertion protrusions 4.5 are inserted; a fourth locking component is installed at the first threaded hole, the fourth locking component including a fourth nut 9.1 and a fourth screw 9.2 that mates with the first threaded hole; the first blade plate 2.2 has multiple receiving blind holes 2.2.1 for receiving the fourth nut 9.1.

[0060] Each of the first nut 6.1, second nut 7.1, third nut 8.1, and fourth nut 9.1 has a sealing ring. Each receiving blind hole 2.2.1 has an annular sealing gasket 2.5 held by the first blade plate 2.2 and the second blade plate 3.1. The mounting base 5 has a sealing frame 5.6 surrounding the first groove 5.2. Each receiving blind hole 2.2.1 communicates with the first groove 5.2 through a connecting channel 2.2.2. The mounting base 5 has a second threaded hole 5.7 communicating with the first groove 5.2 and a fourth groove 5.8 communicating with the second threaded hole 5.7. A sealing bolt 10 is installed at the second threaded hole 5.7. The sealing bolt 10 includes a fifth nut and a fifth threaded rod fixed to the fifth nut. The fifth nut has a sealing ring that abuts against the fourth groove 5.8. The number of the insertion protrusion 4.5, the insertion through hole 3.3.1, and the receiving blind holes 2.2.1 are equal. There are nine receiving blind holes 2.2.1. The first embedding groove 2.3 has three sections, and the second embedding groove 2.4 has two sections, with the three first embedding grooves 2.3 and the two second embedding grooves 2.4 alternating. The first protrusion 3.5 and the third protrusion 4.4 each have three sections, and the second protrusion 3.6 has two sections, with the three first protrusions 3.5 and the two second protrusions 3.6 alternating. Both the first embedding groove 2.3 and the second embedding groove 2.4 have curved surfaces; the first protrusion 3.5, the second protrusion 3.6, and the third protrusion 4.4 all have curved surfaces. The sealing ring, the annular sealing gasket 2.5, and the sealing frame 5.6 are all made of rubber material. The first blade plate 2.2 has multiple first positioning blind holes 2.2.3 and multiple second positioning blind holes 2.2.4; the second blade plate 3.1 has multiple first positioning protrusions 3.7 that mate with the first positioning blind holes 2.2.3; and the third blade plate 4.1 has multiple second positioning protrusions 4.6 that mate with the second positioning blind holes 2.2.4.

[0061] Working Principle: The impeller of the axial flow pump of this application has a blade unit composed of a mounting base, a first blade, a second blade, and a third blade. The mounting base and the first blade are integrally cast, resulting in high strength. Furthermore, the second and third blades are 3D printed, allowing biomimetic structures to be printed onto them. This assembly method enables the manufacture of large axial flow pump blades while balancing assembly strength and the arrangement of biomimetic structures. Additionally, the first, second, third, and fourth locking components are not exposed on the blade surface, thus preventing disturbance to the fluid caused by the locking components.

[0062] Specifically, the second and third blades are first fixedly connected by inserting through holes, inserting protrusions, and the fourth locking component. The second and third blades are then installed as a whole on the first blade. The first locking component securely connects the mounting base and the third blade, the second locking component securely connects the mounting base and the second blade, and the third locking component securely connects the mounting base and the protrusion. Thus, the mounting base and the first, second, and third blades form a single, stable unit. Multiple blind holes, multiple connecting channels, and the second groove are interconnected to form a single, interconnected space (hereinafter referred to as the detection space for ease of description). The first, second, third, and fourth nuts are all located within this detection space. Due to the sealing rings at the first, second, third, and fourth nuts, theoretically, there will be no leakage at the countersunk or through holes where the first, second, third, and fourth locking components are inserted. Furthermore, the blind holes are sealed by an annular sealing gasket, and there will be no leakage at the position of the annular sealing gasket when the second and third blades are pressed together. During maintenance, the sealing bolts can be loosened, and high-pressure gas can be injected through the second threaded hole. The system should be kept sealed, and the gas pressure should be checked after a period of time to determine whether there is a leak in the sealing rings at the first, second, third, and fourth nuts, as well as the sealing frame. If the gas pressure drops, it indicates that at least one location has leaked, meaning that a nut at a certain location has become loose, requiring more detailed inspection and maintenance. If the gas pressure does not drop, it means that the locking components are in a stable and locked state, indicating that the blade is securely installed and can be used normally.

[0063] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A low-lift high-flow axial flow pump, characterized by, The utility model provides a pump, including pump shell, drive motor, the rotating shaft of being driven by drive motor, install in the fixed guide vane of pump shell, install at the impeller of rotating shaft and install at the water cone of rotating shaft, the impeller includes impeller seat and a plurality of blade units of installing in impeller seat, the blade unit includes first blade, second blade, third blade and the mounting seat fixedly connected with first blade, second blade and third blade are all fixed at first blade, mounting seat and first blade are integrally casted into shape, second blade and third blade are all 3D printing formation.

2. The low-lift high-flow axial pump of claim 1, wherein, The mounting recess has a mounting through hole, the mounting seat is embedded in the mounting recess and has a mounting counterbore, and the mounting counterbore and the mounting through hole are matched and fixedly connected by bolts and nuts.

3. The low-head high-flow axial pump according to claim 2, wherein The number of mounting recesses and blade units is three; the three mounting recesses are annularly and equidistantly distributed, each mounting recess has four mounting through holes, and each mounting seat has four mounting counterbores.

4. The low-head high-flow axial pump of claim 1, wherein, The first blade includes a connecting seat fixedly connected with the mounting seat and a first blade plate fixedly connected with the connecting seat, and the mounting seat has a first recess; the second blade includes a second blade plate and a protruding seat fixedly connected with the second blade plate, the second blade plate has a stepped recess and a second recess for accommodating the first blade plate; the third blade includes a third blade plate and an extension plate fixedly connected with the third blade plate and matched with the stepped recess, and the third blade plate has a third recess for accommodating the first blade plate; the first recess has a plurality of first counterbores, a plurality of second counterbores and a plurality of third counterbores, the first blade plate has a plurality of first embedding grooves communicated with the first counterbores and a plurality of second embedding grooves communicated with the second counterbores, the second blade plate has a first protrusion embedded in the first embedding groove and a second protrusion embedded in the second embedding groove, and the third blade plate has a third protrusion embedded in the first embedding groove; the first protrusion has a through channel, the third protrusion has a first threaded channel, the second protrusion has a second threaded channel, and the protruding seat has a plurality of third threaded channels communicated with the third counterbores; the first counterbores are provided with first locking components, the first locking components include first nuts, limiting rods passing through the through channels and first screws matched with the first threaded channels, the second counterbores are provided with second locking components, the second locking components include second nuts and second screws matched with the second threaded channels, and the third counterbores are provided with third locking components, the third locking components include third nuts and third screws matched with the third threaded channels; the extension plate has a plurality of insertion protrusions, the insertion protrusions have first threaded holes, the stepped recess has a plurality of insertion through holes inserted by the insertion protrusions, the first threaded holes are provided with fourth locking components, the fourth locking components include fourth nuts and fourth screws matched with the first threaded holes, and the first blade plate has a plurality of accommodating blind holes for accommodating the fourth nuts.

5. The low-head high-flow axial pump according to claim 4, wherein The first nut, the second nut, the third nut and the fourth nut are provided with sealing rings, each accommodating blind hole is provided with an annular sealing gasket clamped by the first blade plate and the second blade plate, the mounting seat is provided with a sealing frame surrounding the first recess, each accommodating blind hole is communicated with the first recess through a connecting channel, the mounting seat is provided with a second threaded hole communicated with the first recess and a fourth recess communicated with the second threaded hole, a closing bolt is installed at the second threaded hole, the closing bolt comprises a fifth nut and a fifth screw fixed with the fifth nut, the fifth nut is provided with a sealing ring abutting against the fourth recess.

6. The low-head high-flow axial pump of claim 5, wherein, The number of the insertion protrusions, the insertion through holes and the accommodating blind holes are equal; the number of the accommodating blind holes is nine.

7. The low-head high-flow axial pump of claim 4, wherein, The first embedding grooves have three, the second embedding grooves have two, and the three first embedding grooves and the two second embedding grooves are alternately distributed; the first protrusions and the third protrusions have three, and the second protrusions have two, and the three first protrusions and the two second protrusions are alternately distributed.

8. The low-head high-flow axial pump of claim 4, wherein, The first embedding grooves and the second embedding grooves have arc surfaces; the first protrusions, the second protrusions and the third protrusions have arc surfaces.

9. The low-head high-flow axial pump of claim 5, wherein, The sealing rings, the annular sealing gaskets and the sealing frames are made of rubber material.

10. The low-head high-flow axial pump of claim 4, wherein, The first blade plate is provided with a plurality of first positioning blind holes and a plurality of second positioning blind holes, the second blade plate is provided with a plurality of first positioning protrusions matched with the first positioning blind holes, and the third blade plate is provided with a plurality of second positioning protrusions matched with the second positioning blind holes.

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