Magnetic suspension anti-impact ceramic impeller for slurry pump

Abstract

The application discloses a magnetic suspension anti-impact ceramic impeller for a slurry pump, which utilizes repulsion of sector permanent magnets and ring permanent magnets to generate magnetic suspension in the circumferential direction and the axial direction of an impeller hub and a connecting section. The impeller hub and the connecting section are designed to be connected by springs and screws, so that the axial calibration repulsion is adjusted, and the circumferential repulsion is set under different conveying conditions. The inner ring of the first ring permanent magnet and the outer ring of the second ring permanent magnet are combined, so that the circumferential calibration repulsion is adjusted, and the circumferential repulsion is set under different conveying conditions. The combination of mechanical connection and flexible floating not only guarantees the connection strength under extreme conditions, but also consumes impact through electromagnetic repulsion, so that the circumferential and axial impact of the ceramic impeller is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of slurry pump technology, and specifically to a magnetically levitated, impact-resistant ceramic impeller for slurry pumps. Background Technology

[0002] Slurry pumps, as a special type of centrifugal pump for transporting solid-liquid mixtures, are widely used in industries such as coal mining, petrochemicals, and metallurgy. Ceramic materials possess good wear resistance and corrosion resistance, and to improve the service life of slurry pump impellers, ceramic impellers are gradually replacing metal impellers. However, when transporting solid-liquid mixtures with large particles and high hardness, the brittleness and poor impact resistance of ceramic materials limit the industrial application of ceramic impellers.

[0003] Chinese patent publication CN210196121U discloses a composite ceramic impeller, which places a metal frame within the ceramic impeller. While this enhances the impeller's strength and extends its lifespan, it suffers from complex manufacturing processes and weak bonding between the metal frame and the ceramic. Chinese patent application CN114382722A discloses a ceramic impeller with an impact-resistant fixing structure. It uses sliding connections of grooves and impeller bosses, along with a return spring for impact buffering. However, this is still a mechanical buffering mechanism and cannot achieve flexible cushioning; under harsh conditions, the impeller can still break. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the present invention aims to provide a magnetically levitated, impact-resistant ceramic impeller for slurry pumps. This impeller utilizes a mechanical structure design to ensure overall connection strength, and employs the repulsive force of fan-shaped and annular permanent magnets to generate magnetic levitation in the circumferential and axial directions between the impeller hub and the connecting section. The combination of mechanical connection and flexible floating ensures connection strength under extreme conditions while simultaneously dissipating impact through electromagnetic repulsion, thereby significantly reducing circumferential and axial impact on the ceramic impeller. A spring and screw connection structure is designed to ensure connection strength, reduce impact, and also allow for axial repulsion adjustment to meet the axial repulsion settings required for different conveying conditions. A coaxial gap mounting structure for the annular permanent magnets is designed to achieve circumferential repulsion adjustment, satisfying the axial repulsion settings required for different conveying conditions.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention provides a magnetically levitated, impact-resistant ceramic impeller for a slurry pump, comprising an impeller hub. The impeller hub has a fixed boss and several first sector-shaped mounting slots arranged in a circular array at its center end face. The fixed boss includes mounting bosses with mounting holes and several mounting brackets circumferentially distributed on the outer wall of the mounting bosses and adapted to the first sector-shaped mounting slots. The circumferential end face of the impeller hub is fixedly connected to a connecting mechanism by several fastening bolts adapted with springs. The springs are arranged between the impeller hub and the connecting mechanism for compression and fixation. A first annular permanent magnet is fixedly attached to the inner wall of the mounting boss.

[0007] The connecting mechanism includes a connecting section. The connecting section has a fixing groove and several second sector-shaped mounting grooves corresponding to the first sector-shaped mounting groove in the middle of its end face near the impeller hub. Sector-shaped permanent magnets arranged in the same direction are installed in the first sector-shaped mounting groove and the second sector-shaped mounting groove, respectively. The end face of the connecting section has a mounting bracket groove adapted to the mounting bracket. The middle of the end face of the connecting section has a mounting post for embedding into the mounting hole and mounting boss. The mounting post has a second mounting boss around its perimeter. A second annular permanent magnet is fixedly attached to the outer wall of the second mounting boss.

[0008] The second annular permanent magnet on the second mounting boss is embedded in the first annular permanent magnet inside the mounting boss with a gap between them. The sector permanent magnets installed in the first sector mounting groove and the second sector mounting groove do not contact each other and repel each other.

[0009] Preferably, the total depth of the mounting hole and the mounting boss in the fixed boss is greater than the height of the mounting column, the depth of the fixed groove is the same as the depth of the mounting bracket groove, and the depth of the mounting bracket groove is greater than the height of the mounting bracket; the fixed boss cooperates with the fixed groove and the mounting column, the mounting hole is installed with a gap from the mounting column, and the mounting bracket is installed with a gap from the mounting bracket groove, ensuring the circumferential connection between the ceramic impeller and the connecting section.

[0010] Preferably, the first sector-shaped mounting groove and the second sector-shaped mounting groove have a plurality of permanent magnet threaded mounting holes for mounting sector-shaped permanent magnets. The thickness of the sector-shaped permanent magnet is less than the depth of the first sector-shaped mounting groove and the second sector-shaped mounting groove. The sector-shaped permanent magnet has threaded holes that are adapted to the permanent magnet threaded mounting holes and screws are installed on it.

[0011] Preferably, the number of the first sector-shaped mounting slots and the second sector-shaped mounting slots is the same and is 4-6. The number of mounting brackets is the same as that of the first sector-shaped mounting slots and they are arranged between adjacent first sector-shaped mounting slots. The number of mounting bracket grooves is the same as that of the second sector-shaped mounting slots and they are arranged between adjacent second sector-shaped mounting slots. Two permanent magnet threaded mounting holes are provided in each first sector-shaped mounting slot and the second sector-shaped mounting slot.

[0012] Preferably, when the impeller hub and the connecting section are installed, there is a gap at their mounting end faces due to the spring. The spring is in a compressed state, ensuring that the impeller hub and the connecting section are fixed and floating axially under the action of spring compression force and permanent magnet repulsion force. The gap is used for axial repulsion force calibration. The inner ring of the first annular permanent magnet 3 and the outer ring of the second annular permanent magnet 5 are coaxial and there is a gap between them, ensuring that the impeller hub 1 and the connecting section 6 are fixed and floating circumferentially under the action of mechanical fixation and permanent magnet repulsion force. The gap is used for circumferential repulsion force calibration.

[0013] Preferably, the circumferential end face of the impeller hub has 4-8 evenly distributed first fixing holes and is fitted with fastening bolts for connecting and fixing the connecting section.

[0014] Preferably, the first fixing hole is provided with a first threaded hole and a first countersunk hole. The first countersunk hole is recessed relative to the impeller hub end face, and the first threaded hole is recessed relative to the end face of the first countersunk hole. The diameter of the first countersunk hole is larger than the diameter of the first threaded hole. The second fixing hole is provided with a second through hole and a second countersunk hole. The first threaded hole and the second through hole are used to connect fastening bolts, and the first countersunk hole and the second countersunk hole are used to install positioning springs.

[0015] Preferably, the outer wall of the mounting column is bonded and fixed to the inner wall of the second annular permanent magnet, and the inner wall of the mounting boss is bonded and fixed to the outer wall of the first annular permanent magnet.

[0016] Preferably, the spring is made of alloy spring steel to ensure sufficient deformation capacity.

[0017] Preferably, the mounting post is a cylindrical structure, and a second mounting boss is provided at the bottom of the mounting post for mounting the second annular permanent magnet. The mounting hole and the mounting boss on the mounting boss are circular holes, with the diameter of the mounting hole being larger than the diameter of the mounting boss, and the mounting boss is used to mount the first annular permanent magnet.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) The mechanical structure design ensures the connection of the ceramic impeller, and the magnetic repulsion of the permanent magnet generates magnetic levitation in the circumferential and axial directions between the impeller hub and the connecting section. The combination of mechanical connection and flexible floating not only ensures the connection strength under extreme conditions, but also consumes the impact through magnetic repulsion, thereby greatly reducing the impact on the circumferential and axial directions of the ceramic impeller.

[0020] (2) The impeller hub and connecting section are designed with spring and screw connection, which not only ensures the connection strength and reduces impact, but also realizes the calibrated repulsion adjustment in the axial direction to meet the axial repulsion setting under different conveying conditions.

[0021] (3) The first annular permanent magnet and the second annular permanent magnet were designed to be installed with a coaxial gap. Multiple sets of the inner ring of the first annular permanent magnet and the outer ring of the second annular permanent magnet were combined to realize the calibrated repulsive force adjustment in the circumferential direction and meet the circumferential repulsive force setting under different conveying conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a magnetically levitated, impact-resistant ceramic impeller for a slurry pump provided in an embodiment of the present invention;

[0024] Figure 2 An exploded view of a magnetically levitated, impact-resistant ceramic impeller for a slurry pump, provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the impeller hub provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of a sector-shaped permanent magnet provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the connecting segment provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the spindle connection hole of the connecting segment provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Impeller hub; 1-1. First sector-shaped mounting groove; 1-1-1. Permanent magnet mounting hole; 1-2. Fixing boss; 1-2-1. Mounting hole; 1-2-2. Mounting bracket; 1-2-3. Mounting boss; 1-3. First fixing hole; 1-3-1. First threaded hole; 1-3-2. First countersunk hole; 2. Sector-shaped permanent magnet; 2-1. Threaded hole; 2-2. Mounting countersunk hole; 3. First annular permanent magnet; 4. Spring; 5. Second annular permanent magnet; 6. Connecting section; 6-1. Second sector-shaped mounting groove; 6-2. Fixing groove; 6-2-1. Mounting bracket groove; 6-3. Second fixing hole; 6-3-1. Second through hole; 6-3-2. Second countersunk hole; 6-4. Mounting column; 6-4-1. Second mounting boss; 6-5. Main shaft connecting hole; 7. Fastening bolt; 8. Screw. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 6 As shown, a magnetically levitated, impact-resistant ceramic impeller for a slurry pump includes an impeller hub 1. The impeller hub 1 has a fixed boss 1-2 and several first sector-shaped mounting grooves 1-1 arranged in a circular array at the center of its end face. The fixed boss 1-2 includes mounting bosses 1-2-3 with mounting holes 1-2-1 and several mounting brackets 1-2-2 circumferentially distributed on the outer wall of the mounting bosses 1-2-3 and adapted to the first sector-shaped mounting grooves 1-1. The circumferential end face of the impeller hub 1 is fixedly connected to a connecting mechanism by several fastening bolts 7 adapted with springs 4. The springs 4 are arranged between the impeller hub 1 and the connecting mechanism for pressing and fixing. A first annular permanent magnet 3 is fixedly attached to the inner wall of the mounting bosses 1-2-3.

[0033] The connecting mechanism includes a connecting section 6. The connecting section 6 has a fixing groove 6-2 and several second sector mounting grooves 6-1 corresponding to the first sector mounting groove 1-1 at the middle of its end face near the impeller hub 1. Sector permanent magnets 2 arranged in the same direction are installed in the first sector mounting groove 1-1 and the second sector mounting grooves 6-1, respectively. The end face of the connecting section 6 has a mounting bracket groove 6-2-1 adapted to the mounting bracket 1-2-2. The middle of the end face of the connecting section 6 has a mounting post 6-4 for embedding into the mounting hole 1-2-1 and the mounting boss 1-2-3. The mounting post 6-4 has a second mounting boss 6-4-1 around its periphery. A second annular permanent magnet 5 is fixedly attached to the outer wall of the second mounting boss 6-4-1.

[0034] The second annular permanent magnet 5 on the second mounting boss 6-4-1 is embedded in the first annular permanent magnet 3 in the mounting boss 1-2-3 with a gap between them. The sector permanent magnets 2 installed in the first sector mounting groove 1-1 and the second sector mounting groove 6-1 do not contact each other and are repulsive to each other.

[0035] In this embodiment, there are 5 of each of the first sector-shaped mounting slot 1-1, the second sector-shaped mounting slot 6-1, the mounting bracket 1-2-2, and the mounting bracket groove 6-2-1, and the corresponding number of the upper and lower sector-shaped permanent magnets 2 are 5 each.

[0036] The total depth of the mounting hole 1-2-1 and the mounting boss 1-2-3 in the fixed boss 1-2 is 5-10mm greater than the height of the mounting column 6-4, and the depth of the mounting bracket groove 6-2-1 is 5-10mm greater than the height of the mounting bracket 1-2-2; the fixed boss 1-2 cooperates with the fixed groove 6-2 and the mounting column 6-4, the mounting hole 1-2-1 is installed with a gap from the mounting column 6-4, and the mounting bracket 1-2-2 is installed with a gap from the mounting bracket groove 6-2-1, to ensure the circumferential connection between the ceramic impeller and the connecting section 6.

[0037] The first sector-shaped mounting groove 1-1 and the second sector-shaped mounting groove 6-1 have several permanent magnet threaded mounting holes 1-1-1 for mounting sector-shaped permanent magnets 2. The thickness of the sector-shaped permanent magnet 2 is less than the depth of the first sector-shaped mounting groove 1-1 and the second sector-shaped mounting groove 6-1. The sector-shaped permanent magnet 2 has threaded holes 2-1 and countersunk holes 2-2 that are adapted to the permanent magnet threaded mounting holes 1-1-1. The threaded holes 2-1 are adapted to screws 8. The depth of the first sector-shaped mounting groove 1-1 and the second sector-shaped mounting groove 6-1 is 5-10mm; the height and depth of the fixing boss 1-2 and the fixing groove 6-2 are both 10-20mm.

[0038] The number of the first sector-shaped mounting slot 1-1 and the second sector-shaped mounting slot 6-1 is the same and is 4-6. The number of mounting brackets 1-2-2 is the same as that of the first sector-shaped mounting slot 1-1 and they are arranged between adjacent first sector-shaped mounting slots 1-1. The number of mounting bracket grooves 6-2-1 is the same as that of the second sector-shaped mounting slot 6-1 and they are arranged between adjacent second sector-shaped mounting slots 6-1. Two permanent magnet threaded mounting holes 1-1-1 are opened in each first sector-shaped mounting slot 1-1 and second sector-shaped mounting slot 6-1.

[0039] When the impeller hub 1 and the connecting section 6 are installed, there is a gap between their mounting end faces due to the spring 4. The spring 4 is in a compressed state with a length of 2-5mm, which ensures that the impeller hub 1 and the connecting section 6 are fixed and floating in the axial direction under the action of spring compression force and permanent magnet repulsion force. The gap is used for axial repulsion force calibration. The inner ring of the first annular permanent magnet 3 and the outer ring of the second annular permanent magnet 5 are coaxial and there is a gap of 2-5mm between them, which ensures that the impeller hub 1 and the connecting section 6 are fixed and floating in the circumferential direction under the action of mechanical fixation and permanent magnet repulsion force. The gap is used for circumferential repulsion force calibration.

[0040] The impeller hub 1 has eight evenly distributed first fixing holes 1-3 on its circumferential end face, which are fitted with fastening bolts 7 for connecting and fixing the connecting section 6. The first fixing holes 1-3 include a first threaded hole 1-3-1 and a first countersunk hole 1-3-2. The connecting section 6 has a second fixing hole 6-3 that matches the first fixing holes 1-3. The second fixing hole 6-3 includes a second through hole 6-3-1 and a second countersunk hole 6-3-2. The side of the connecting section 6 facing away from the impeller hub 1 has a main shaft connecting hole 6-5. A spring 4 is installed between the first countersunk hole 1-3-2 and the second countersunk hole 6-3-2.

[0041] The outer wall of the mounting column 6-4 is bonded and fixed to the inner wall of the second annular permanent magnet 5, and the inner wall of the mounting boss 1-2-3 is bonded and fixed to the outer wall of the first annular permanent magnet 3.

[0042] The spring 4 is made of alloy spring steel to ensure sufficient deformation capacity.

[0043] The mounting post 6-4 is a cylindrical structure, and a second mounting boss 6-4-1 is provided at the bottom of the mounting post 6-4 for mounting the second annular permanent magnet 5. The mounting hole 1-2-1 and the mounting boss 1-2-3 on the fixing boss 1-2 are circular holes, and the diameter of the mounting hole 1-2-1 is larger than the diameter of the mounting boss 1-2-3. The mounting boss 1-2-3 is used to mount the first annular permanent magnet 3.

[0044] During installation, the sector-shaped permanent magnet 2 is first fixedly installed in the first sector-shaped mounting slot 1-1 and the second sector-shaped mounting slot 6-1 using screws 8. The first annular permanent magnet 3 is fixedly installed on the mounting boss 1-2-3, and the second annular permanent magnet 5 is fixedly installed on the second mounting boss 6-4-1. The magnetic poles of the sector-shaped permanent magnet 2 on the first sector-shaped mounting slot 1-1 and the second sector-shaped mounting slot 6-1 are all installed in the same direction. The magnetic poles on the opposite sides of the first sector-shaped mounting slot 1-1 and the second sector-shaped mounting slot 6-1 are installed in the same direction, ensuring that the sector-shaped permanent magnet 2 exerts a repulsive force in the axial direction between the impeller hub 1 and the connecting section 6. The inner ring surface of the first annular permanent magnet 3 and the outer ring surface of the second annular permanent magnet 5 have the same magnetic poles, ensuring that the first annular permanent magnet 3 and the second annular permanent magnet 5 exert a repulsive force in the circumferential direction between the impeller hub 1 and the connecting section 6.

[0045] Then, the mounting bracket 1-2-2 is installed in conjunction with the mounting bracket groove 6-2-1, the mounting hole 1-2-1 and the mounting boss 1-2-3 are installed in conjunction with the mounting post 6-4, and the spring 4 is installed between the first countersunk hole 1-3-2 and the second countersunk hole 6-3-2.

[0046] Finally, the fastening bolt 7 passes through the first through hole 6-3-1 and connects to the first threaded hole 1-3-1, so that the spring 4 is in a compressed state. According to the repulsion requirements between the impeller hub 1 and the connecting section 6, the gap is adjusted by the fastening bolt 7 for axial repulsion calibration. The ceramic impeller is in a magnetic levitation state under the action of electromagnetic force.

[0047] During operation, the repulsive force of the sector-shaped permanent magnet 2 generates magnetic levitation between the impeller hub 1 and the connecting section 6 in the circumferential and axial directions. Under the action of the mechanical structure, screws, and springs, the connection strength under extreme conditions is guaranteed, thereby forming a flexible micro-float between the ceramic impeller and the aforementioned screws and springs, which greatly reduces the impact of the ceramic impeller in the circumferential and axial directions.

[0048] This device utilizes a mechanical structure design to ensure the overall connection strength of the ceramic impeller, and employs the repulsive force of fan-shaped and annular permanent magnets to generate magnetic levitation in the circumferential and axial directions between the impeller hub and the connecting section. The combination of mechanical connection and flexible floating ensures connection strength under extreme conditions while also dissipating impact through magnetic repulsion, thus significantly reducing the circumferential and axial impact on the ceramic impeller. The spring and screw connection structure not only ensures connection strength and reduces impact but also allows for calibrated axial repulsion force adjustment to meet the axial repulsion force settings under different conveying conditions. A coaxial gap mounting structure for the annular permanent magnets is designed to achieve calibrated circumferential repulsion force adjustment, meeting the circumferential repulsion force settings under different conveying conditions.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A magnetic levitation impact-proof ceramic impeller for a slurry pump, characterized by, The impeller hub (1) includes a ceramic impeller. The middle part of the end face of the impeller hub (1) is provided with a fixed boss (1-2) and a number of first sector-shaped mounting slots (1-1) evenly distributed in a ring array. The fixed boss (1-2) includes a mounting boss (1-2-3) with mounting holes (1-2-1) and a number of mounting brackets (1-2-2) evenly distributed in a ring on the outer wall of the mounting boss (1-2-3) and adapted to the first sector-shaped mounting slots (1-1). The circumferential end face of the impeller hub (1) is fixedly connected to the connecting mechanism by a number of fastening bolts (7) adapted to springs (4). The springs (4) are arranged between the impeller hub (1) and the connecting mechanism to press and fix. The inner wall of the mounting boss (1-2-3) is fitted and fixed with a first annular permanent magnet (3). The connecting mechanism includes a connecting section (6). The connecting section (6) has a fixing groove (6-2) and several second sector mounting grooves (6-1) corresponding to the first sector mounting groove (1-1) at the middle of the end face of the connecting section (6) near the impeller hub (1). Sector permanent magnets (2) are installed in the first sector mounting groove (1-1) and the second sector mounting grooves (6-1). The end face of the connecting section (6) has a mounting bracket groove (6-2-1) adapted to the mounting bracket (1-2-2). The middle of the end face of the connecting section (6) has a mounting post (6-4) for embedding into the mounting hole (1-2-1) and the mounting boss (1-2-3). The mounting post (6-4) has a second mounting boss (6-4-1). A second annular permanent magnet (5) is fixedly attached to the outer wall of the second mounting boss (6-4-1). The second annular permanent magnet (5) on the second mounting boss (6-4-1) is embedded in the first annular permanent magnet (3) in the mounting boss (1-2-3) and there is a gap between them. The sector permanent magnets (2) installed in the first sector mounting groove (1-1) and the second sector mounting groove (6-1) do not contact each other and are repulsive to each other.

2. The magnetic levitation anti-impact ceramic impeller for a slurry pump as described in claim 1, characterized in that, The total depth of the mounting hole (1-2-1) and mounting boss (1-2-3) in the fixed boss (1-2) is greater than the height of the mounting column (6-4). The depth of the fixed groove (6-2) is the same as the depth of the mounting bracket groove (6-2-1). The depth of the mounting bracket groove (6-2-1) is greater than the height of the mounting bracket (1-2-2). The fixed boss (1-2) cooperates with the fixed groove (6-2) and the mounting column (6-4). The mounting hole (1-2-1) is installed with a gap from the mounting column (6-4). The mounting bracket (1-2-2) is installed with a gap from the mounting bracket groove (6-2-1), ensuring the circumferential connection between the ceramic impeller and the connecting section (6).

3. The magnetic levitation anti-impact ceramic impeller for a slurry pump as described in claim 2, characterized in that, The first sector-shaped mounting groove (1-1) and the second sector-shaped mounting groove (6-1) have a plurality of permanent magnet threaded mounting holes (1-1-1) for mounting sector-shaped permanent magnets (2). The thickness of the sector-shaped permanent magnet (2) is less than the depth of the first sector-shaped mounting groove (1-1) and the second sector-shaped mounting groove (6-1). The sector-shaped permanent magnet (2) has threaded holes (2-1) that are adapted to the permanent magnet threaded mounting holes (1-1-1) and screws (8) are installed on it.

4. The magnetic levitation anti-impact ceramic impeller for a slurry pump as described in claim 3, characterized in that, The number of the first sector-shaped mounting slot (1-1) and the second sector-shaped mounting slot (6-1) is the same and is 4-6. The number of mounting brackets (1-2-2) is the same as that of the first sector-shaped mounting slot (1-1) and they are arranged between adjacent first sector-shaped mounting slots (1-1). The number of mounting bracket grooves (6-2-1) is the same as that of the second sector-shaped mounting slot (6-1) and they are arranged between adjacent second sector-shaped mounting slots (6-1). Two permanent magnet threaded mounting holes (1-1-1) are opened in each first sector-shaped mounting slot (1-1) and the second sector-shaped mounting slot (6-1).

5. The magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 4, characterized in that, When the impeller hub (1) and the connecting section (6) are installed, there is a gap between their installation end faces due to the spring (4). The spring (4) is in a compressed state, ensuring that the impeller hub (1) and the connecting section (6) are fixed and floating in the axial direction under the action of spring compression force and permanent magnet repulsion force. The gap is used for axial repulsion calibration. The inner ring of the first annular permanent magnet (3) and the outer ring of the second annular permanent magnet (5) are coaxial and there is a gap between them, ensuring that the impeller hub (1) and the connecting section (6) are fixed and floating in the circumferential direction under the action of mechanical fixation and permanent magnet repulsion force. The gap is used for circumferential repulsion calibration.

6. The magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 5, characterized in that, The impeller hub (1) has 4-8 evenly distributed first fixing holes (1-3) on its circumferential end face and is fitted with fastening bolts (7) for connecting and fixing the connecting section (6). The connecting section (6) is provided with second fixing holes (6-3) that are adapted to the first fixing holes (1-3).

7. The magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 6, characterized in that, The first fixing hole (1-3) is provided with a first threaded hole (1-3-1) and a first countersunk hole (1-3-2). The first countersunk hole (1-3-2) is recessed relative to the end face of the impeller hub (1), and the first threaded hole (1-3-1) is recessed relative to the end face of the first countersunk hole (1-3-2). The diameter of the first countersunk hole (1-3-2) is larger than the diameter of the first threaded hole (1-3-1). The second fixing hole (6-3) is provided with a second through hole (6-3-1) and a second countersunk hole (6-3-2). The first threaded hole (1-3-1) and the second through hole (6-3-1) are used to connect fastening bolts (7). The first countersunk hole (1-3-2) and the second countersunk hole (6-3-2) are used to install positioning springs (4).

8. The magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 7, characterized in that, The outer wall of the mounting column (6-4) is bonded and fixed to the inner wall of the second annular permanent magnet (5), and the inner wall of the mounting boss (1-2-3) is bonded and fixed to the outer wall of the first annular permanent magnet (3).

9. The magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 8, characterized in that, The spring (4) is made of alloy spring steel to ensure sufficient deformation capacity.

10. A magnetically levitated, impact-resistant ceramic impeller for a slurry pump as described in claim 9, characterized in that, The mounting post (6-4) is a cylindrical structure, and the bottom of the mounting post (6-4) is provided with a second mounting boss (6-4-1) for mounting a second annular permanent magnet (5); the mounting hole (1-2-1) and the mounting boss (1-2-3) on the fixing boss (1-2) are circular holes, the diameter of the mounting hole (1-2-1) is larger than the diameter of the mounting boss (1-2-3), and the mounting boss (1-2-3) is used to mount a first annular permanent magnet (3).

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