A cutting pump

Abstract

This utility model relates to a cutting pump, which solves the problem of complex and unreasonable shearing structures in the prior art. The technical solution adopted includes: a pump body having an impeller cavity and a shearing cavity, an impeller assembly respectively disposed in the impeller cavity and the shearing cavity and disposed on a rotating shaft, and at least one set of shearing assemblies, a motor for driving the rotating shaft to rotate, each set of shearing assemblies including a cutting disc and a cutting blade that cooperate with each other, characterized in that the rotating shaft is provided with a positioning member corresponding to each set of shearing assemblies, the positioning member being used to axially position the cutting disc and the cutting blade, and to maintain an axial clearance fit between each set of cutting discs and cutting blades.

Description

Technical Field

[0001] This utility model relates to the field of cutting pumps, and more particularly to a cutting pump for cutting particulate matter in liquids. Background Technology

[0002] In integrated water and fertilizer systems, a shearing structure is often installed at the pump suction end to improve the dissolution rate and efficiency of granular fertilizers. This shearing structure cuts the granules, reducing their size and increasing their quantity, thus increasing the contact area with water and improving the dissolution rate and efficiency. However, existing shearing structures are complex and flawed. For example, the cutting disc and cutting blade are stacked together under the action of springs without any axial clearance. If granules accidentally enter between the mating cutting disc and cutting blade, it can easily alter the spring force, causing an imbalance in the axial forces on the cutting disc and cutting blade, resulting in axial wobbling or vibration. This, in turn, affects the performance of the corresponding components (e.g., seal failure leading to water leakage affecting pump efficiency, and the fit between the cutting disc and cutting blade affecting the shearing effect) and their lifespan. Summary of the Invention

[0003] The purpose of this utility model is to solve the above-mentioned problems existing in the prior art by providing a cutting pump. A rigid positioning component is set on the rotating shaft. The positioning component is not only used to axially position the cutting disc and the cutting blade, but also to maintain an axial clearance fit between each set of cutting discs and cutting blades. This is beneficial to ensure the positioning stability of the cutting disc and the cutting blade, ensuring cutting efficiency and cutting effect, and avoiding axial vibration or shaking, thereby improving the service life of related components and the cutting pump.

[0004] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a cutting pump, comprising a pump body having a shearing chamber and an impeller chamber, an impeller assembly respectively disposed in the shearing chamber and the impeller chamber and disposed on a rotating shaft, and at least one set of shearing assemblies, a motor for driving the rotating shaft to rotate, each set of shearing assemblies comprising a cutting disc and a cutting blade that cooperate with each other, characterized in that the rotating shaft is provided with a positioning member corresponding to each set of shearing assemblies, the positioning member being used to axially position the cutting disc and the cutting blade, and to maintain an axial clearance fit between each set of cutting discs and cutting blades.

[0005] The difference between this technical solution and the existing technology is that a rigid positioning component is set on the rotating shaft. The positioning component is not only used to axially position the cutting disc and the cutting blade, but also to maintain an axial clearance fit between each set of cutting discs and cutting blades. This is beneficial to ensure the positioning stability of the cutting disc and the cutting blade, ensuring cutting efficiency and cutting effect, and also to avoid axial vibration or shaking, thereby improving the service life of related components and the cutting pump.

[0006] Furthermore, the gap design provides space for particles to enter, allowing them to dissolve and leave the gap. This prevents particles from entering the gapless cutting disc and blade, which would cause relative displacement and reduce the fit. Therefore, a cutting disc and blade with a gap fit ensures assembly stability and effectively prevents displacement. This not only ensures the reliability of the cutting disc and blade's shearing operation, thus ensuring shearing efficiency and effect, but also effectively prevents axial vibration or shaking of the cutting disc and blade.

[0007] In this technical solution, the shearing components can be one set, or two sets or more. When there are two or more shearing components, for ease of description, the direction away from the impeller assembly is defined as the outer side, and the opposite direction is defined as the inner side. The shearing components include the outermost shearing component and the shearing component between the outer shearing component and the impeller assembly.

[0008] As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: Preferably, the positioning component includes a bushing portion, an outer positioning surface and an inner positioning surface located at both ends of the bushing portion, the bushing portion being fitted onto the rotating shaft and passing through the shaft hole of the cutting disc, the outer positioning surface abutting against the inner end face of the corresponding cutting blade, the inner positioning surface abutting against the outer end face of the cutting blade on the adjacent shearing assembly, or abutting against the corresponding end face of the impeller assembly.

[0009] In this technical solution, the positioning component is preferably a rigid component. The cutting disc is fixed to the pump body by fasteners or other fixing methods. The position of the cutting blade is achieved by the outer positioning surface and the inner positioning surface axially pressing against the corresponding parts of the adjacent cutting blades or the cutting blade and impeller assembly, thereby keeping the axial position of the cutting blade unchanged. This ensures a stable gap between the cutting disc and the cutting blade, which is used to store particles that accidentally enter the gap, creating a dissolution space for the particles and preventing the particles entering the gap from changing the positional relationship between the cutting disc and the cutting blade. This ensures the shearing effect and efficiency, avoids vibration and noise, and effectively improves the reliability of the shearing assembly, reduces the maintenance probability, and thus helps ensure the service life of the cutting pump.

[0010] Preferably, the gap between each set of cutting discs and cutting blades is d, where d = 0.5 mm to 1.5 mm. Controlling the gap size not only provides space for particles to enter between the cutting discs and cutting blades, but also ensures the effectiveness and efficiency of the cutting process, and helps ensure the assembly reliability of the shearing components while reducing vibration.

[0011] Preferably, the shearing assembly located away from the impeller assembly is an outer shearing assembly, and the cutting disc on the outer shearing assembly is an outer cutting disc. The outer cutting disc has several clearance grooves, and a countersunk hole is provided on the shaft hole wall of the outer cutting disc. The clearance grooves are also countersunk hole structures. By providing clearance grooves and countersunk holes, it is beneficial for particles entering the gap between the cutting disc and the cutting blade to be stored and dissolved in the clearance grooves and countersunk holes, avoiding the situation where particles accumulate in the gap and affect the cutting disc and the cutting blade.

[0012] Preferably, the pump body includes a pump casing and a water inlet seat with a water inlet. The outer end of the rotating shaft extends into the inner cavity of the water inlet seat. The outer edge of the outer cutting disc clamps and fixes between the pump casing and the water inlet seat. A sealing structure is provided between the outer edge of the outer cutting disc and the pump casing and the water inlet seat. The sealing structure is preferably an elastic sealing structure.

[0013] Preferably, the sealing structure includes elastic sealing rings respectively disposed on both surfaces of the cutting disc, and at least one elastic sealing protrusion ring disposed on the sealing surface of the elastic sealing ring. The elastic sealing protrusion ring and the elastic sealing ring are integral or separate structures, and the elastic sealing protrusion ring and the elastic sealing ring are arranged coaxially. Since the sealing surface of the elastic sealing ring is a plane, it is a surface contact fit when it mates with the connecting surfaces on the pump housing and the water inlet seat. Surface contact fits have high requirements for the processing technology and processing accuracy of the mating surfaces (especially the connecting surfaces on the pump housing and the water inlet seat), requiring a flatter plane to achieve a better sealing effect. Therefore, elastic sealing protrusion rings are provided on the two sealing surfaces of the elastic sealing ring, so that the elastic sealing protrusion rings form a ring-shaped seal with the connecting surfaces on the pump housing and the water inlet seat. Line contact fits have relatively lower requirements for processing technology and assembly technology, and can form a more reliable sealing fit relationship. This helps to prevent water leakage due to gaps between the pump housing, the water inlet seat, and the outer cutting disc, and helps to ensure reliable sealing and prevent water leakage.

[0014] Preferably, the elastic sealing ring has an L-shaped cross-section. The elastic sealing ring is respectively fastened to the connection between the pump housing and the water inlet seat, and the elastic sealing ring covers the end face and corresponding parts of the inner wall of the connection. That is, the inner edge of the annular elastic sealing ring body is provided with a folded fastening guide ring, thereby forming an L-shaped elastic sealing ring. The fastening guide ring facilitates the initial fixing of the elastic sealing ring to the connection between the pump housing and the water inlet seat, and then the assembly and fixing of the pump housing, outer cutting disc, and water inlet seat together. This improves the accuracy of the elastic sealing ring's position, thereby enhancing sealing reliability.

[0015] Preferably, the cutting blade on the outer shearing assembly is an outer cutting blade, which has several rotating blade bodies. Each rotating blade body has an outer cutting edge that protrudes arc-shaped in the direction of rotational cutting. The outer cutting disc is provided with several outer through holes. The rotating blade bodies cooperate with the outer through holes to shear particulate matter. Typically, the cross-sectional dimension of the outer through holes is smaller than the external dimension of the particulate matter before shearing. When the outer cutting blade cooperates with the outer through holes to shear, the outer through holes first limit the particulate matter. After being sheared, the particulate matter becomes smaller and passes through the outer through holes into the next stage of the shearing assembly (i.e., the inner shearing assembly) or the impeller assembly.

[0016] Preferably, the diameter of the outer through-hole gradually increases along the axial direction of the water flow. The wall of the outer through-hole is provided with several shearing protrusions, and the rotary blade body is provided with several cutting teeth corresponding to the outer cutting edge. The cutting teeth and the shearing protrusions increase the probability of collision with particles. The cooperation of the shearing protrusions and cutting teeth allows for pre-collision with particles before the outer cutting edge, breaking them into more small particles, thus improving the shearing effect and efficiency. Furthermore, the shearing protrusions also enhance the strength of the rotary blade body (especially the outer cutting edge).

[0017] Preferably, the shearing components located between the outer shearing component and the impeller component are several sets of inner shearing components with successively decreasing outer diameters. Each set of inner shearing components includes an inner cutting disc and an inner cutting blade with clearance fit. The inner cutting blade has a straight-arm blade body, and the straight-arm blade body is provided with a cutting straight edge on the side facing the rotation direction. The inner cutting disc is provided with several inner through holes, and a wavy shearing part is provided on the side of the inner through holes facing the cutting straight edge. The wavy shearing part forms a shearing fit with the cutting straight edge.

[0018] The beneficial effects of this utility model are as follows: 1. A rigid positioning component is set on the rotating shaft. This component not only axially positions the cutting disc and cutting blade but also maintains an axial clearance fit between each set of cutting discs and cutting blades. This helps ensure the positioning stability of the cutting disc and cutting blade, ensuring shearing efficiency and shearing effect, while also preventing axial vibration or shaking, thereby improving the service life of related components and the cutting pump. 2. The clearance groove is also a countersunk hole structure. By setting the clearance groove and countersunk hole, particles entering the gap between the cutting disc and cutting blade are stored and dissolved in the clearance groove and countersunk hole, preventing particles from accumulating in the gap and affecting the cutting disc and cutting blade. 3. A sealing structure is set between the outer edge of the outer cutting disc and the pump housing and the water inlet seat. An elastic sealing convex ring is set on the sealing surface of the sealing structure, changing the surface contact seal to a line contact seal. This not only improves the sealing effect but also helps reduce the machining and assembly precision of related components. 4. The cooperation between the shearing protrusions and the cutting teeth allows for pre-collision of the particles before the outer cutting edge, breaking them into more small particles, thus improving the shearing effect and efficiency. Furthermore, the shearing protrusions enhance the strength of the rotary blade body (especially the outer cutting edge). 5. The diameter of the outer through-hole gradually increases along the axial direction of the water flow, and the cross-sectional size of the through-hole is smaller than the external size of the unsheared particles. This facilitates effective shearing of the particles and ensures that the sheared particles meet certain size requirements, thereby increasing the dissolution rate and solubility of granular fertilizer (referred to as granules). Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural schematic diagram of this utility model.

[0020] Figure 2 yes Figure 1 A partially enlarged structural diagram.

[0021] Figure 3 This is a schematic diagram of the structure of an external shearing component involved in this utility model.

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of the external shear disk in a machine.

[0023] Figure 5 This is a schematic diagram of the internal shearing component involved in this utility model.

[0024] In the diagram: 1. Pump casing; 2. Impeller assembly; 3. Motor; 4. Shaft sleeve; 5. Outer positioning surface; 6. Inner positioning surface; 7. Outer cutting disc; 8. Clearance groove; 9. Countersunk hole; 10. Water inlet seat; 11. Elastic sealing convex ring; 12. Body; 13. Fastening guide ring; 14. Outer cutting blade; 15. Rotary arm blade body; 16. Outer cutting edge; 17. Outer through hole; 18. Shearing protrusion; 19. Cutting teeth; 20. Inner cutting disc; 21. Inner cutting blade; 22. Straight arm blade body; 23. Cutting straight edge; 24. Inner through hole; 25. Wavy shearing part; 26. Shaft end fixing part; 27. Rotating shaft. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0026] Example: Figures 1-4 As shown, a cutting pump includes a pump body having a shearing chamber and an impeller chamber, an impeller assembly 2 disposed in the shearing chamber and the impeller chamber respectively and disposed on a rotating shaft 27, and at least one set of shearing assemblies, and a motor 3 for driving the rotating shaft 27 to rotate. Each set of shearing assemblies includes a cutting disc and a cutting blade that cooperate with each other.

[0027] The difference between this technical solution and the prior art is that: the rotating shaft 27 is provided with a positioning element corresponding to each group of shearing components. The positioning element is used to axially position the cutting disc and the cutting blade, and to maintain an axial clearance fit between each group of cutting discs and cutting blades.

[0028] In other words, a rigid positioning element is set on the rotating shaft 27. The positioning element is not only used to axially position the cutting disc and the cutting blade, but also to maintain an axial clearance fit between each set of cutting discs and cutting blades. This helps to ensure the positioning stability of the cutting disc and the cutting blade, ensures the cutting efficiency and cutting effect, and avoids axial vibration or shaking, thereby helping to improve the service life of related components and the cutting pump.

[0029] Furthermore, the gap design provides space for particles to enter, allowing them to dissolve and leave the gap. This prevents particles from entering the gapless cutting disc and blade, which would cause relative displacement and reduce the fit. Therefore, a cutting disc and blade with a gap fit ensures assembly stability and effectively prevents displacement. This not only ensures the reliability of the cutting disc and blade's shearing operation, thus ensuring shearing efficiency and effect, but also effectively prevents axial vibration or shaking of the cutting disc and blade.

[0030] In this practical application, the shearing components can be one set, or two sets or more. When there are two or more sets of shearing components, for ease of description, the direction away from the impeller assembly 2 is defined as the outer side, and vice versa. Therefore, the shearing components include an outer shearing component located on the outermost side, and an inner shearing component located between the outer shearing component and the impeller assembly 2. In this embodiment, the shearing components are preferably two or more sets, such as... Figures 1-5 As shown.

[0031] Next, further improvements and additions to the above technical solution will be made: In practical applications, the positioning component includes a bushing portion 4, an outer positioning surface 5 and an inner positioning surface 6 located at both ends of the bushing portion 4. The bushing portion 4 is fitted onto the rotating shaft 27 and passes through the shaft hole of the cutting disc. The outer positioning surface 5 abuts against the inner end face of the corresponding cutting blade. The inner positioning surface 6 abuts against the outer end face of the cutting blade on the adjacent shearing assembly, or abuts against the corresponding end face of the impeller assembly 2.

[0032] In this technical solution, the positioning component is preferably a rigid component. The cutting disc is fixed to the pump body by fasteners or other fixing methods. The position of the cutting blade is achieved by the outer positioning surface 5 and the inner positioning surface 6 axially pressing against the adjacent cutting blades or the corresponding parts of the cutting blade and impeller assembly 2, so as to keep the axial position of the cutting blade unchanged. This ensures that there is a stable gap between the cutting disc and the cutting blade, which is used to store particles that accidentally enter the gap, creating a dissolution space for the particles and preventing the particles entering the gap from changing the positional relationship between the cutting disc and the cutting blade. This ensures the shearing effect and shearing efficiency, avoids vibration and noise, and effectively improves the reliability of the shearing assembly, reduces the maintenance probability, and thus helps to ensure the service life of the cutting pump.

[0033] In practical applications, the positioning component that cooperates with the shaft end of the rotating shaft 27 also includes a shaft end fixing part 26. The shaft end fixing part 26 and the bushing part 4 are either an integral structure or a separate structure. The shaft end fixing part 26 passes through the shaft hole of the cutting blade located at the shaft end and is fastened to the shaft end fastener.

[0034] In practical applications, the gap between each set of cutting discs and cutting blades is d, where d = 0.5 mm to 1.5 mm.

[0035] Controlling the gap size is beneficial for providing space for particles to enter between the cutting disc and the cutting blade, ensuring the effectiveness and efficiency of the cutting disc and the cutting blade in shearing, and also for ensuring the assembly reliability of the shearing assembly and reducing vibration.

[0036] In practical applications, the shearing component that is far from the impeller assembly 2 is the outer shearing component, the cutting disk on the outer shearing component is the outer cutting disk 7, the outer cutting disk 7 is provided with a plurality of clearance grooves 8, and the shaft hole wall of the outer cutting disk 7 is provided with countersunk holes 9.

[0037] In this embodiment, there are 3 to 10 clearance grooves (preferably 8), arranged in a centrally symmetrical manner. Normally, the clearance grooves 8 are arranged in a one-to-one correspondence with the outer through holes 17, and are adapted to the appropriate position of the outer end of the outer through holes 17.

[0038] In this technical solution, the clearance groove 8 and the countersunk hole 9 are provided to facilitate the exit of particles that enter the gap between the cutting disc and the cutting blade through the clearance groove 8 and the countersunk hole 9, thereby preventing them from accumulating in the gap and affecting the cutting disc and the cutting blade.

[0039] In practical applications, the pump body includes a pump casing 1 and a water inlet seat 10 with a water inlet. The outer end of the rotating shaft 27 extends into the inner cavity of the water inlet seat 10. The outer edge of the outer cutting disc 7 clamps and fixes between the pump casing 1 and the water inlet seat 10. A sealing structure is provided between the outer edge of the outer cutting disc 7 and the pump casing 1 and the water inlet seat 10. The sealing structure is preferably an elastic sealing structure to prevent water leakage at the assembly connection.

[0040] In practical applications, in order to further improve the sealing effect, the sealing structure includes elastic sealing rings respectively disposed on the two surfaces of the cutting disc, and at least one elastic sealing protrusion 11 disposed on the sealing surface of the elastic sealing ring. The elastic sealing protrusion 11 and the elastic sealing ring are an integral structure or a separate structure, and the elastic sealing protrusion 11 and the elastic sealing ring are arranged coaxially.

[0041] In this technical solution, since the sealing surface of the elastic sealing ring is a plane, it is a surface contact fit when it mates with the connecting surfaces on the pump housing 1 and the water inlet seat 10. Surface contact fits have high requirements for the processing technology and processing accuracy of the mating surfaces (especially the connecting surfaces on the pump housing 1 and the water inlet seat 10), and require a flatter plane to achieve a better sealing effect. Therefore, elastic sealing protrusions 11 are provided on the two sealing surfaces of the elastic sealing ring, so that the elastic sealing protrusions 11 form a ring-shaped seal with the connecting surfaces on the pump housing 1 and the water inlet seat 10. Line contact fits have relatively lower requirements for processing technology and assembly technology, and can form a more reliable sealing fit relationship. This helps to prevent water leakage due to gaps between the pump housing 1, the water inlet seat 10 and the outer cutting disc 7, and helps to ensure reliable sealing and prevent water leakage.

[0042] In this embodiment, at least two elastic sealing protrusions 11 are provided on one sealing surface of the elastic sealing ring at intervals.

[0043] In practical applications, in order to facilitate the assembly of the elastic sealing ring, the cross-section of the elastic sealing ring is L-shaped. The elastic sealing ring is respectively fastened to the connection part of the pump housing 1 and the water inlet seat 10, and the elastic sealing ring covers the end face and corresponding part of the inner wall of the connection part.

[0044] In this technical solution, the body 12 of the elastic sealing ring is annular, and a folded snap-fit ​​guide ring 13 is provided on the inner edge of the body 12, thereby forming an L-shaped elastic sealing ring. The snap-fit ​​guide ring 13 facilitates the initial fixing of the elastic sealing ring to the connection between the pump housing 1 and the water inlet seat 10, and then the assembly and fixing of the pump housing 1, the outer cutting disc 7, and the water inlet seat 10 together. This improves the accuracy of the elastic sealing ring's position and thus enhances the sealing reliability.

[0045] In practical applications, the cutting blade on the outer shearing assembly is an outer cutting blade 14, which has several rotating blade bodies 15. Each rotating blade body 15 has an outer cutting edge 16 that protrudes arc-shaped in the direction of rotational cutting. The outer cutting disk 7 is provided with several outer through holes 17. The rotating blade bodies 15 cooperate with the outer through holes 17 to cut particulate matter.

[0046] Normally, the cross-sectional dimension of the outer through hole 17 is smaller than the external dimension of the particles when they are not sheared. When the outer cutting blade 14 and the outer through hole 17 work together to shear, the outer through hole 17 first limits the particles. After the particles are sheared, their volume becomes smaller and they pass through the outer through hole 17 into the next level shearing assembly (i.e., the inner shearing assembly) or the impeller assembly 2.

[0047] In this embodiment, there are 3 to 10 external through holes 17 (preferably 8), arranged in a centrally symmetrical manner. The external through holes 17 have an arc-shaped structure and are bent in the direction of rotation of the external cutting blade 14.

[0048] In practical applications, the diameter of the outer through hole 17 gradually increases along the axial direction of the water flow. The outer through hole 17 has several shearing protrusions 18 on its wall. The rotary blade body 15 has several cutting teeth 19 corresponding to the outer cutting edge 16. The cutting teeth 19 and the shearing protrusions 18 are used to increase the probability of collision with particles.

[0049] In this embodiment, each rotary blade body 15 is provided with 3 to 5 shearing protrusions 18. The inner wall of the outer through hole 17 is provided with 3 to 8 cutting teeth 19.

[0050] In this technical solution, the cooperation between the shearing protrusion 18 and the cutting teeth 19 allows for pre-collision of the particles before the outer cutting edge, breaking them into a larger number of smaller particles, thereby improving the shearing effect and efficiency. Furthermore, the shearing protrusion 18 also enhances the strength of the rotary arm cutter body 15 (especially the outer cutting edge 16).

[0051] In practical applications, the shearing components located between the outer shearing component and the impeller component 2 are several sets of inner shearing components with successively decreasing outer diameters. Each set of inner shearing components includes an inner cutting disk 20 and an inner cutting blade 21 with clearance fit. The inner cutting blade 21 has a straight arm blade body 22, and the straight arm blade body 22 is provided with a cutting straight blade 23 on the side facing the rotation direction. The inner cutting disk 20 is provided with several inner through holes 24, and a wavy shearing part 25 is provided on the side of the inner through holes 24 facing the cutting straight blade 23. The wavy shearing part 25 forms a shearing fit with the cutting straight blade 23.

[0052] In this technical solution, the cross-sectional dimension of the inner through hole 24 is also smaller than the external dimension of the particles surrounding the inner cutting disc 20. The cross-sectional dimension of the inner through hole 24 can gradually increase along the axial direction and toward the motor 3. The number of inner through holes 24 is 3 to 10, preferably 8. The width of the straight arm cutter body 22 gradually increases in the radial outward direction.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cutting pump, comprising a pump body having a shearing chamber and an impeller chamber, an impeller assembly (2) respectively disposed in the shearing chamber and the impeller chamber and disposed on a rotating shaft (27), and at least one set of shearing assemblies, a motor (3) for driving the rotating shaft (27) to rotate, each set of the shearing assemblies comprising a cutting disc and a cutting blade that cooperate with each other, characterized in that The rotating shaft (27) is provided with a positioning element corresponding to each group of shearing components. The positioning element is used to axially position the cutting disc and the cutting blade, and to maintain an axial clearance fit between each group of cutting discs and the cutting blade.

2. The cutting pump of claim 1, wherein The positioning component includes a bushing (4), an outer positioning surface (5) and an inner positioning surface (6) located at both ends of the bushing (4). The bushing (4) is fitted onto the rotating shaft (27) and passes through the shaft hole of the cutting disc. The outer positioning surface (5) abuts against the inner end face of the corresponding cutting blade. The inner positioning surface (6) abuts against the outer end face of the cutting blade on the adjacent shearing assembly, or abuts against the corresponding end face of the impeller assembly (2).

3. The cutting pump of claim 1, wherein The gap between the cutting disc and the cutting blade in each group is d, where d = 0.5 mm to 1.5 mm.

4. A cutting pump according to claim 1 or 2 or 3, characterized in that The shearing assembly away from the impeller assembly (2) is an outer shearing assembly. The cutting disk on the outer shearing assembly is an outer cutting disk (7). The outer cutting disk (7) is provided with several clearance grooves (8). The shaft hole wall of the outer cutting disk (7) is provided with several countersunk holes (9).

5. The cutting pump of claim 4, wherein The pump body includes a pump casing (1) and a water inlet seat (10) with a water inlet. The outer end of the rotating shaft (27) extends into the inner cavity of the water inlet seat (10). The outer edge of the outer cutting disc (7) is clamped and fixed between the pump casing (1) and the water inlet seat (10). A sealing structure is provided between the outer edge of the outer cutting disc (7) and the pump casing (1) and the water inlet seat (10).

6. The cutting pump of claim 5, wherein The sealing structure includes elastic sealing rings respectively disposed on the two surfaces of the cutting disc, and at least one elastic sealing protrusion (11) disposed on the sealing surface of the elastic sealing ring. The elastic sealing protrusion (11) and the elastic sealing ring are an integral structure or a separate structure. The elastic sealing protrusion (11) and the elastic sealing ring are arranged coaxially.

7. The cutting pump of claim 6, wherein The cross-section of the elastic sealing ring is L-shaped. The elastic sealing ring is fastened to the connection part of the pump housing (1) and the water inlet seat (10), and the elastic sealing ring covers the end face and corresponding part of the inner wall of the connection part.

8. The cutting pump of claim 4, wherein The cutting blade on the outer shearing assembly is an outer cutting blade (14). The outer cutting blade (14) has several rotating blade bodies (15). The rotating blade bodies (15) have an outer cutting edge (16) that protrudes arc-shaped in the direction of rotational cutting. The outer cutting disc (7) is provided with several outer through holes (17). The rotating blade bodies (15) cooperate with the outer through holes (17) to cut particulate matter.

9. The cutting pump according to claim 8, characterized in that... The diameter of the outer through hole (17) gradually increases along the axial direction of the water flow. The outer through hole (17) has several shearing protrusions (18) on its wall. The rotary blade body (15) has several cutting teeth (19) corresponding to the outer cutting edge (16). The cutting teeth (19) and the shearing protrusions (18) are used to increase the probability of collision with particles.

10. The cutting pump of claim 4, wherein The shearing components located between the outer shearing component and the impeller component (2) are several sets of inner shearing components with successively decreasing outer diameters. Each set of inner shearing components includes an inner cutting disc (20) and an inner cutting blade (21) with clearance fit. The inner cutting blade (21) has a straight arm blade body (22). The straight arm blade body (22) is provided with a cutting straight blade (23) on the side facing the rotation direction. The inner cutting disc (20) is provided with several inner through holes (24). The inner through holes (24) are provided with a wavy shearing part (25) on the side facing the cutting straight blade (23). The wavy shearing part (25) and the cutting straight blade (23) form a shearing fit.

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