Wear-resistant ceramic overflowing part for slurry pump

Abstract

The invention provides a wear-resistant ceramic overflowing part for a slurry pump, and relates to the technical field of slurry pumps, the overflowing part comprises a volute part, an impeller assembly, a front protective plate and a rear protective plate, the impeller assembly is formed by compounding a ceramic impeller main body and a metal rear cover plate through a flexible buffer connecting layer; a microstructure wear-resistant layer formed by laser is arranged on the overflowing surface of the impeller main body, and the microstructure can change the flowing state of slurry particles, reduce wear and form a self-protection layer; and a wireless passive surface acoustic wave sensor is pre-embedded in the impeller main body, and is used for monitoring stress, temperature and crack signals in real time and transmitting the stress, temperature and crack signals to external equipment. The service life of the overflowing part is greatly prolonged, the reliability of the overflowing part is greatly improved, predictive maintenance is achieved, and sudden failures are avoided by combining ceramic high hardness, microstructure wear resistance enhancement, composite buffering impact resistance and real-time state monitoring.

Description

Technical Field

[0001] This invention relates to the field of slurry pump technology, and in particular to a wear-resistant ceramic flow-through component for slurry pumps. Background Technology

[0002] Slurry pumps are key equipment used to transport abrasive slurries containing solid particles (such as ore, ash, and silt). Their core flow-through components include the volute, impeller, front liner, and rear liner. The volute is the main structure of the pump body. The front and rear liner are located on the suction and drive sides, respectively, forming a flow-through chamber surrounding the impeller together with the inner surface of the volute. The impeller typically consists of an impeller body and a rear cover plate, and is driven to rotate by a drive component, transporting the slurry from the suction side to the volute outlet. In practical applications, the flow-through components are subjected to the impact, cutting, and corrosion of high-speed solid particles over long periods, making wear a particularly prominent issue that directly affects the pump's efficiency and lifespan.

[0003] Existing slurry pump flow components are often made of metal (such as high-chromium cast iron) or conventional ceramic materials. While metal materials have good toughness, their hardness is limited and their wear resistance is insufficient, making them prone to rapid failure under strong abrasive conditions. Traditional ceramic materials (such as alumina ceramics) have high hardness and good wear resistance, but they are brittle and easily crack or fracture under impact loads and thermal stress. In addition, existing structures lack real-time monitoring methods for wear conditions, and maintenance relies on periodic disassembly and inspection or experience-based judgment, making predictive maintenance difficult and prone to sudden failures and downtime losses. Summary of the Invention

[0004] The purpose of this invention is to provide wear-resistant ceramic flow parts for slurry pumps to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A wear-resistant ceramic flow-through component for a slurry pump includes a volute, an impeller assembly, a front guard plate, and a rear guard plate. The front and rear guard plates are respectively located on the suction side and drive side of the volute, forming a flow-through chamber surrounding the impeller assembly with the inner surface of the volute. The impeller assembly includes an impeller body and a rear cover plate, which are arranged opposite to each other. The impeller body is made of structural ceramic material. A microstructured wear-resistant layer is provided on the easily worn functional area of ​​the impeller body facing the front guard plate. The back of the impeller body is firmly bonded to the rear cover plate through a flexible buffer connection layer, forming a ceramic-metal composite structure. A sensor is embedded inside the impeller body to sense the stress and temperature changes on the flow-through surface of the impeller body and transmit them to a signal receiving device.

[0007] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one alternative: the flexible buffer connection layer is an organic silicone adhesive layer, a flexible epoxy adhesive layer, or a flexible metal felt layer; the rear cover plate is made of carbon steel, stainless steel, or high-chromium cast iron, and it is fitted into the back of the impeller body.

[0009] In one alternative: the structural ceramic material is alumina ceramic, silicon carbide ceramic, silicon nitride ceramic, zirconia-toughened alumina ceramic, or a composite material thereof.

[0010] In one alternative embodiment: the impeller body includes an impeller liner and multiple rear blades. A blade portion is provided on the back of the impeller liner. The blade portion passes through a flexible buffer connection layer and is connected to the rear cover plate to form a secondary blade protruding from the back of the rear cover plate. Multiple rear blades are circumferentially distributed on the flow surface of the impeller liner. The rear blades are backward-curved blades, and a flow channel is formed between two adjacent rear blades. Each rear blade has a sensing hole inside, which is used to embed a sensor.

[0011] In one alternative: the rear cover plate has a blade cover protruding toward the rear guard plate inside. The blade cover is fitted onto and adapted to the corresponding blade portion. Each blade cover has a bolt. The blade portion has a fastening hole. The bolt extends into the fastening hole and is threadedly connected to it.

[0012] In one alternative: the impeller liner has a forward protrusion at the center of its flow surface, the forward protrusion being a conical or hemispherical structure; the forward protrusion has an internal hole extending to the back of the impeller liner; the rear cover plate has a bushing at its center that connects to the drive shaft, the bushing having a post on its end face facing the impeller body that can extend into the internal hole, and the end of the post having a vibration sensor that contacts the impeller liner, the vibration sensor being used to sense the vibration performance of the impeller liner when subjected to slurry.

[0013] In one alternative: the front guard plate has an inlet flow channel at its center, the inlet flow channel being a horn-shaped contraction structure and coaxial with the impeller body.

[0014] In one alternative embodiment: the rear guard plate includes a rear guard plate body and an inner liner body. The outer edge of the rear guard plate body has a sealing abutment ring, and the sealing abutment ring is sealed and connected to the through-hole of the volute. The inner liner body is located at the center of the rear guard plate body and rotates with the drive shaft. The inner liner body is located between the rear cover plate and the bearing. The end face of the rear guard plate body facing the impeller assembly has an arc-shaped structure and is parallel to the back of the rear cover plate.

[0015] In one alternative: the inner liner has an annular cavity inside and at least one outlet hole is provided on the inner wall of the annular cavity; the end face of the rear guard plate body away from the impeller assembly has a return hole, which is connected to the outlet hole and connected to the pump inlet through a return pipe.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] The impeller body of this invention is made of high-hardness ceramic material, combined with a microstructured wear-resistant layer on the surface. Through micro-dimples, micro-grooves, or scale structures, the collision angle and flow state of particles are altered, converting some sliding friction into rolling friction. The microstructure stores fine particles, forming a "self-protective layer" that significantly reduces wear rate, buffers impacts, and extends component lifespan. A flexible buffer connection layer firmly bonds the ceramic impeller body to the metal rear cover plate, forming a ceramic-metal composite structure that effectively absorbs mechanical and thermal stresses generated during pump start-up and shutdown, as well as particle impacts, preventing brittle fracture of the ceramic. A wireless passive surface acoustic wave sensor is pre-embedded inside the impeller body to sense stress, temperature, and crack initiation signals on the flow surface in real time. Communicating with an external reader / writer via a signal coupler, maintenance personnel can remotely monitor component fatigue, provide early warnings before critical damage, and arrange replacement, completely avoiding sudden failures and improving equipment operational safety and maintenance efficiency. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the wear-resistant ceramic flow-through component for slurry pumps according to one perspective of the present invention.

[0020] Figure 2 This is another structural schematic diagram of the wear-resistant ceramic flow element for the slurry pump in this invention.

[0021] Figure 3 This is a schematic diagram of the impeller assembly from one perspective in this invention.

[0022] Figure 4 This is another structural schematic diagram of the impeller assembly in this invention.

[0023] Figure 5 This is a schematic diagram of the impeller body from one perspective in this invention.

[0024] Figure 6This is a schematic diagram of the impeller body from another perspective in this invention.

[0025] Figure 7 This is a schematic diagram of the rear cover plate structure in this invention.

[0026] Figure 8 This is a schematic diagram of the rear guard plate from one perspective in this invention.

[0027] Figure 9 This is a schematic diagram of the rear guard plate from another perspective in this invention.

[0028] Reference numerals in the attached drawings: volute 100, impeller assembly 200, impeller body 210, impeller liner 211, blade section 212, sensing hole 213, rear blade 214, forward protrusion 215, internal hole 216, fastening hole 217, flexible buffer connection layer 220, rear cover plate 230, bushing section 231, blade cover 232, bolt 233, insert 234, vibration sensor 235, sensor 240, front guard plate 300, inlet flow channel section 310, rear guard plate 400, rear guard plate body 410, inner liner sleeve 420, annular cavity 430, outlet hole 440, return hole 450, sealing abutment ring 460. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0030] The left, right, up, and down positions of the various components shown in the attached diagram are just one arrangement method; the specific positions should be set according to specific needs.

[0031] In one embodiment, such as Figures 1-4As shown, a wear-resistant ceramic flow-through component for a slurry pump includes a volute 100, an impeller assembly 200, a front guard plate 300, and a rear guard plate 400. The front guard plate 300 and the rear guard plate 400 are respectively disposed on the suction side and the drive side of the volute 100, and together with the inner surface of the volute 100, they form a flow-through chamber surrounding the impeller assembly 200. The impeller assembly 200 includes an impeller body 210 and a rear cover plate 230, which are disposed opposite to each other. The impeller body 210 is made of structural ceramic material. The wear-prone functional area of ​​the impeller body 210 facing the front guard plate 300 is provided with a microstructured wear-resistant layer. The back of the impeller body 210 is firmly connected to the rear cover plate 230 through a flexible buffer connection layer 220 to form a ceramic-metal composite structure. A sensor 240 is embedded inside the impeller body 210. The sensor 240 is used to sense the stress and temperature changes on the flow surface of the impeller body 210 and transmit them to the signal receiving device.

[0032] In this embodiment of the invention, the slurry is guided into the flow chamber by the front guard plate 300. The drive component of the slurry pump is fixedly connected to the impeller assembly 200 through the center of the rear guard plate 400, driving the impeller assembly 200 to rotate. The impeller body 210 guides the slurry to the outlet of the volute 100. The surface of the impeller body 210 is in direct contact with the slurry. The microstructured wear-resistant layer on its surface is a modified layer with micro-pits, micro-grooves or scale-like superimposed structures formed on the surface of the flow component body (1) by laser surface treatment. Its surface roughness Ra is 0.8μm-3.2μm, and the thickness of the modified layer is 50μm-300μm of the front guard plate. This structure can effectively change the collision angle and flow state between the slurry particles and the surface, convert some sliding friction into rolling friction, and use the microstructure to store fine particles to form a "self-protective layer", thereby synergistically improving wear resistance and impact resistance. Moreover, the hardness of ceramic materials (such as alumina, silicon carbide, silicon nitride, etc.) is also improved. Extremely high (HRA80-95), effectively resisting particle impact and cutting wear, significantly extending component life. The ceramic maintains its performance at high temperatures (e.g., silicon carbide with a temperature resistance of over 400℃), suitable for high-temperature slurry or thermal conditions. Sensor 240 is a wireless passive surface acoustic wave sensor with its antenna extending to the non-flow surface and communicating with an external reader / writer via a signal coupler. It is used to monitor the strain, temperature, or crack initiation signals of the impeller assembly 200 in real time, providing direct data for predictive maintenance. When the impeller assembly 200 is used in a slurry pump, the flow surface of the impeller body 210 resists extreme wear thanks to the ceramic hardness and the microstructured wear-resistant layer on the surface. The rear cover plate 230 ensures that it can withstand the mechanical and thermal stress caused by pump start-up and shutdown and particle impact. Sensor 240 allows maintenance personnel to remotely monitor its "fatigue state," providing early warning and arranging replacement before critical damage occurs, completely avoiding sudden failures.

[0033] In one embodiment, such as Figures 1-4 As shown, the flexible buffer connection layer 220 is an organic silicone adhesive layer, a flexible epoxy adhesive layer, or a flexible metal felt layer; the rear cover plate 230 is made of carbon steel, stainless steel, or high-chromium cast iron, and it fits into the back of the impeller body 210. This design greatly increases the bonding area and mechanical interlocking force. The flexible buffer connection layer 220 can absorb and buffer vibration and thermal stress during operation, preventing the impeller body 210 from breaking due to stress concentration. The structural ceramic material is alumina ceramic, silicon carbide ceramic, silicon nitride ceramic, zirconia-toughened alumina ceramic, or a composite material thereof.

[0034] In one embodiment, such as Figures 1-7 As shown, the impeller body 210 includes an impeller liner 211 and multiple rear blades 214. A blade portion 212 is provided on the back of the impeller liner 211. The blade portion 212 passes through a flexible buffer connection layer 220 and is connected to the rear cover plate 230 to form an auxiliary blade protruding from the back of the rear cover plate 230. Multiple rear blades 214 are circumferentially distributed on the flow surface of the impeller liner 211. The rear blades 214 are backward-curved blades, and a flow channel is formed between two adjacent rear blades 214. In this embodiment of the invention, the arrangement of auxiliary blades can increase the tightness and strength of the connection between the impeller body 210 and the rear cover plate 230. Through rotation, they can act on the back of the impeller assembly 200 and... The slurry between the rear guard plates 400 acts on the outlet of the volute 100. The backward-curved blades (blade outlet angle 20-35 degrees) are different from the forward-curved blades. The backward-curved design can reduce the impact wear of the slurry on the blade section 212, and at the same time reduce the radial force when the impeller assembly 200 is running. The number of blade sections 212 is 6-8 (up to 10 for large-diameter pumps). The thickness of the blade section 212 increases with the increase of the particle size of the conveyed slurry, and the flow channel is "arc-shaped and gradually expanding". Each rear blade 214 has a sensing hole 213 inside. The sensing hole 213 is used to embed the sensor 240, so that the wear of the easily worn rear blade 214 can be accurately sensed. The flow channel adopts an Archimedes spiral gradually expanding flow channel, and the cross-sectional area of ​​the flow channel increases linearly and uniformly from the center of the impeller body 210 to the volute outlet; the flow velocity of the slurry decreases uniformly in the flow channel; the kinetic energy of the slurry is converted into pressure energy to the maximum extent; the inner surface of the flow channel has no steps or right angles, and all connections are rounded (R10-R20) to avoid local eddies and scouring wear.

[0035] In one embodiment, such as Figures 1-7As shown, the rear cover plate 230 has a blade cover 232 protruding towards the rear guard plate 400 inside. The blade cover 232 is fitted onto the corresponding blade portion 212 and is adapted to it. Each blade cover 232 has a bolt 233. The blade portion 212 has a fastening hole 217. The bolt 233 extends into the fastening hole 217 and is threadedly connected to it. In this embodiment of the invention, the rear cover plate 230 is made of high chromium steel, which has high mechanical impact and thermal stress. Through the cooperation of the rear blade 214 and the blade cover 232, the consistency of the overall rotation is achieved, ensuring disassembly and connection strength.

[0036] In one embodiment, such as Figures 1-7 As shown, the impeller liner 211 has a forward protrusion 215 at the center of its flow surface. The forward protrusion 215 is a conical or hemispherical structure. The forward protrusion 215 has an internal hole 216 that extends to the back of the impeller liner 211. The rear cover plate 230 has a bushing 231 at its center that connects to the drive shaft. The end face of the bushing 231 facing the impeller body 210 has a post 234 that can extend into the internal hole 216. The end of the post 234 has a vibration sensor 235 that contacts the impeller liner 211. The vibration sensor 235 is used to sense the impeller. The vibration performance of the impeller liner 211 when handling slurry; In this embodiment of the invention, the front protrusion 215 corresponds to the front of the slurry entering the flow chamber, and its surface can guide the positive impact of the slurry to flow into the flow channel, reducing the impact intensity borne by the surface of the impeller liner 211. The setting of the insert 234 can ensure that the impeller body 210 and the rear cover plate 230 rotate coaxially. The vibration sensor 235 senses the vibration performance of the impeller body 210 in real time when conveying slurry. It will produce unique vibration spectrum characteristics for the imbalance, misalignment, component loosening, bearing damage and early cavitation of the impeller assembly 200.

[0037] In one embodiment, such as Figures 1-7 As shown, the front guard plate 300 is provided with an inlet flow channel 310 at its center. The inlet flow channel 310 is a horn-shaped contraction structure and is coaxial with the impeller body 210. In this embodiment of the invention, the horn-shaped inlet flow channel 310 can guide the slurry to smoothly enter the impeller body 210, eliminate inlet eddies, and reduce the risk of cavitation.

[0038] In one embodiment, such as Figures 1-9As shown, the rear guard plate 400 includes a rear guard plate body 410 and an inner liner 420. The outer edge of the rear guard plate body 410 has a sealing abutment ring 460, which is sealed and connected to the opening of the volute 100. The inner liner 420 is located at the center of the rear guard plate body 410 and rotates with the drive shaft. The inner liner 420 is located between the rear cover plate 230 and the bearing. The end face of the rear guard plate body 410 facing the impeller assembly 200 is arc-shaped and parallel to the back of the rear cover plate 230. In this embodiment of the invention, the end face of the rear guard plate body 410 facing the impeller assembly 200 is arc-shaped, which prevents the slurry from eroding the bearing body and provides space for the axial movement of the impeller assembly 200.

[0039] The inner liner 420 has an annular cavity 430 inside, and at least one outlet hole 440 is provided on the inner wall of the annular cavity 430. The end face of the rear guard plate body 410 away from the impeller assembly 200 is provided with a return hole 450. The return hole 450 is connected to the outlet hole 440 and is connected to the pump inlet through a return pipe to guide the leaked slurry back to the inlet and prevent the slurry from overflowing.

[0040] The above embodiment provides a wear-resistant ceramic flow-through component for a slurry pump, the working principle of which is as follows:

[0041] The slurry medium first enters the inlet channel 310 at the center of the front guard plate 300. This trumpet-shaped contraction structure can smoothly guide the slurry, eliminate inlet eddies, reduce the risk of cavitation, and allow the slurry to enter the impeller area in a more uniform flow pattern.

[0042] After entering the flow chamber, the slurry directly impacts the high-speed rotating impeller body 210. The conical or hemispherical structure of the forward-convex portion 215 at the center of the impeller liner 211 first bears and disperses the positive impact, guiding the slurry into the flow channel formed by multiple backward-curved blades 214. The impeller body 210 is driven to rotate at high speed by the drive component, and the backward blades 214 on it do work on the slurry, transferring mechanical energy to the slurry and increasing its pressure energy and kinetic energy.

[0043] The impeller body 210 is made of high-hardness structural ceramic, which fundamentally resists the cutting and impact wear of hard particles in the slurry. The microstructured wear-resistant layer on the flow surface of the impeller body 210 is formed by laser processing to create micro-pits and micro-grooves, which can effectively change the particle collision angle and flow state, convert some sliding friction into rolling friction, and store fine particles to form a "self-protective layer", thus synergistically improving wear resistance and impact resistance.

[0044] Flow channel optimization: The flow channel adopts an Archimedean spiral gradually expanding design, with the cross-sectional area increasing linearly and uniformly from the center to the outlet, causing the slurry velocity to decrease uniformly and maximizing the conversion of kinetic energy into pressure energy.

[0045] The slurry, having gained energy, is ejected from the impeller channel and enters the volute 100. After being diffused and guided by the volute, it is discharged from the pump outlet. The rear guard plate 400 is sealed to the volute 100 opening via a sealing ring 460 on its outer edge to prevent slurry leakage.

[0046] When the impeller assembly 200 rotates, the secondary blades on the back of its rear cover plate 230 protrude from the blade portion 212 to form a slurry between the back of the impeller and the rear guard plate 400, reducing pressure buildup and helping to push this part of the slurry toward the volute outlet.

[0047] Meanwhile, a small amount of slurry may leak into the rear liner plate area 400. The leaked slurry can enter the annular cavity 430 of the inner liner 420 and flow into the return hole 450 through the outflow hole 440 on its inner wall. Finally, it is guided back to the pump inlet via the return pipe, forming a closed loop to prevent slurry overflow and maintain system pressure balance. The arc-shaped end face of the rear liner plate body 410 facing the impeller 200 not only prevents slurry from eroding the rear bearing but also provides space for the axial movement of the impeller assembly 200.

[0048] Structural Protection and Stress Buffering: The ceramic portion of the impeller body 210 is firmly bonded to the metal rear cover plate 230 via a flexible buffering connection layer 220, such as an organic silicone layer, a flexible epoxy layer, or a flexible metal felt, forming a ceramic-metal composite structure. This design provides a large bonding area and mechanical interlocking force, achieved by connecting the blade section 212 to the blade cover 232 of the rear cover plate 230 using bolts 233 and fastening holes 217. It also utilizes the flexible layer to absorb and buffer vibrations and thermal stresses caused by pump start-up and shutdown, and particle impacts, preventing the ceramic impeller body 210 from brittle fracture due to stress concentration. The insert 234 at the center of the rear cover plate 230 is inserted into the built-in hole 216 on the back of the impeller liner 211, ensuring coaxial rotation of both.

[0049] Intelligent condition monitoring and predictive maintenance:

[0050] Wireless passive sensors 240, such as surface acoustic wave sensors, are embedded in the sensing holes 213 of the impeller body 210, especially the rear blade 214. They can sense the stress, temperature changes, and even crack initiation signals on the flow surface in real time, and transmit the data to an external reader through a signal coupler.

[0051] The vibration sensor 235, located at the end of the insert 234 of the rear cover plate 230, directly contacts the impeller liner 211 and is used to monitor the vibration performance of the impeller assembly 200 in real time. Its vibration spectrum characteristics can reflect faults such as imbalance, misalignment, loose parts or early cavitation.

[0052] These monitoring data provide maintenance personnel with real-time "fatigue status" of the impeller assembly 200, enabling predictive maintenance, providing early warnings and arranging replacements before critical damage occurs in components, thereby completely avoiding sudden downtime failures.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. A wear-resistant ceramic flow-through component for a slurry pump, comprising a volute (100), an impeller assembly (200), a front guard plate (300), and a rear guard plate (400), characterized in that, The front guard plate (300) and the rear guard plate (400) are respectively provided on the suction side and the driving side of the volute (100), and together with the inner surface of the volute (100), they form a flow chamber surrounding the impeller assembly (200). The impeller assembly (200) includes an impeller body (210) and a rear cover plate (230). The impeller body (210) and the rear cover plate (230) are arranged opposite to each other. The impeller body (210) is made of structural ceramic material. The surface of the impeller body (210) facing the front guard plate (300) has a microstructured wear-resistant layer on the surface of the wear-prone functional area. The back of the impeller body (210) is firmly bonded to the rear cover plate (230) through a flexible buffer connection layer (220) to form a ceramic-metal composite structure; A sensor (240) is embedded inside the impeller body (210). The sensor (240) is used to sense the stress and temperature changes on the flow surface of the impeller body (210) and transmit them to the signal receiving device.

2. The wear-resistant ceramic flow-through component for a slurry pump according to claim 1, characterized in that, The flexible buffer connection layer (220) is an organic silicone adhesive layer, a flexible epoxy adhesive layer, or a metal flexible felt layer; the rear cover plate (230) is made of carbon steel, stainless steel, or high chromium cast iron, and it is fitted to the back of the impeller body (210).

3. The wear-resistant ceramic flow-through component for a slurry pump according to claim 2, characterized in that, The structural ceramic material is alumina ceramic, silicon carbide ceramic, silicon nitride ceramic, zirconia-toughened alumina ceramic, or a composite material thereof.

4. The wear-resistant ceramic flow-through component for a slurry pump according to claim 1, characterized in that, The impeller body (210) includes an impeller liner (211) and multiple rear blades (214). The impeller liner (211) has a blade section (212) on its back. The blade section (212) passes through the flexible buffer connection layer (220) and is connected to the rear cover plate (230) to form a secondary blade protruding from the back of the rear cover plate (230). Multiple rear blades (214) are circumferentially distributed on the flow surface of the impeller liner (211). The rear blades (214) are backward-curved blades, and a flow channel is formed between two adjacent rear blades (214). Each rear blade (214) has a sensing hole (213) inside, which is used to embed a sensor (240).

5. The wear-resistant ceramic flow-through component for a slurry pump according to claim 4, characterized in that, The rear cover plate (230) has a blade cover (232) protruding towards the rear guard plate (400) inside. The blade cover (232) is fitted onto the corresponding blade part (212) and is adapted to it. Each blade cover (232) has a bolt (233). The blade part (212) has a fastening hole (217). The bolt (233) extends into the fastening hole (217) and is threadedly connected to it.

6. The wear-resistant ceramic flow-through component for a slurry pump according to claim 5, characterized in that, The impeller liner (211) has a forward protrusion (215) at the center of the flow surface, and the forward protrusion (215) is a conical structure or a hemispherical structure. The protruding part (215) has an internal hole (216) inside and the internal hole (216) extends to the back of the impeller liner (211); The rear cover plate (230) has a bushing (231) connected to the drive shaft at its center. The bushing (231) has a post (234) on its end face facing the impeller body (210) that can extend into the interior hole (216). The end of the post (234) is provided with a vibration sensor (235) that contacts the impeller liner (211). The vibration sensor (235) is used to sense the vibration performance of the impeller liner (211) when it is subjected to slurry.

7. The wear-resistant ceramic flow-through component for a slurry pump according to claim 1, characterized in that, The front guard plate (300) is provided with an inlet flow channel (310) at its center. The inlet flow channel (310) is a horn-shaped contraction structure and is coaxial with the impeller body (210).

8. The wear-resistant ceramic flow-through component for a slurry pump according to claim 1, characterized in that, The rear guard plate (400) includes a rear guard plate body (410) and an inner liner body (420). The outer edge of the rear guard plate body (410) has a sealing abutment ring (460) and the sealing abutment ring (460) is sealed and connected to the opening of the volute part (100). The inner liner (420) is located at the center of the rear guard plate body (410) and rotates with the drive shaft. The inner liner (420) is located between the rear cover plate (230) and the bearing. The end face of the rear guard plate body (410) facing the impeller assembly (200) is an arc-shaped structure and is parallel to the back of the rear cover plate (230).

9. The wear-resistant ceramic flow-through component for a slurry pump according to claim 8, characterized in that, The inner liner (420) has an annular cavity (430) inside and at least one outlet hole (440) is provided on the inner wall of the annular cavity (430). The rear guard plate body (410) has a return hole (450) on the end face away from the impeller assembly (200). The return hole (450) is connected to the outlet hole (440) and is connected to the pump inlet through the return pipe.

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