High-wear-resistance slurry pump new material overflowing piece

Abstract

The invention discloses a high-wear-resistance slurry pump new material overflowing piece, and relates to the technical field of slurry pumps, the high-wear-resistance slurry pump new material overflowing piece comprises a pump body, an impeller, a protective sleeve, a front protective plate, a rear protective plate and an auxiliary impeller, and the impeller is formed by forming reaction sintering silicon carbide through a 3D printing technology, sintering the reaction sintering silicon carbide at the high temperature of 1450 DEG C and compounding the reaction sintering silicon carbide with a specially-made metal framework. The sheath is formed by forming reaction sintering silicon carbide through a 3D printing technology, sintering and forming at the high temperature of 1450 DEG C and then wrapping metal outside to ensure the use strength, wear resistance and impact resistance, and the front protection plate and the rear protection plate are formed through the 3D printing technology, sintering and forming at the high temperature of 1450 DEG C and then compounding with the metal to ensure wear resistance and impact resistance. The front protective plate and the rear protective plate are fixedly installed on the front side and the rear side of the pump body through bolts respectively, the impeller is rotationally connected into the pump body through a rotating shaft, the auxiliary impeller is fixedly connected to the rear side of the impeller and located in the pump body, and the pump body, the impeller, the protective sleeve, the front protective plate, the rear protective plate and the auxiliary impeller are all formed by compounding reaction sintering silicon carbide. The method has the advantages that the wear resistance and impact resistance of the reaction sintered silicon carbide are improved on the premise that the hydraulic line is not changed, the high wear resistance of the reaction sintered silicon carbide is ensured, and the defect that the silicon carbide is fragile and not resistant to impact can be overcome.

Description

Technical Field

[0001] The invention relates to the technical field of slurry pumps, and in particular to a high-wear-resistant slurry pump new material flow-through part. Background Art

[0002] A slurry pump is a pump used to transport solid-liquid mixtures. It is suitable for transporting solid-liquid mixtures with strong abrasion and containing hard solid particles, such as ore slurry, ash, gravel, etc. The slurry pumps currently used in China are generally mechanical centrifugal slurry pumps. The working process of a mechanical centrifugal slurry pump is actually a process of energy transfer and conversion. The mechanical energy of the high-speed rotation of the motor is transmitted through the pump blades and converted into the pressure energy and kinetic energy of the pumped fluid.

[0003] At present, the flow parts of slurry pumps at home and abroad are all made of high chromium alloy materials. The more representative one is the combination of silicon carbide and silicon nitride. The advantages are good impact resistance and wear resistance and good process flow. The disadvantages are that the processing technology of silicon carbide combined with silicon nitride changes the original hydraulic line. The thickness of the impeller must be increased to meet the process requirements, which may affect the fluid dynamics performance of the pump. The increase in the thickness of the impeller may cause the overall weight of the pump to increase, which not only affects the installation and operation of the pump, but may also have a negative impact on the power efficiency of the pump. In view of the above problems, a new material flow part of a high wear-resistant slurry pump is proposed to solve them. Summary of the invention

[0004] In order to solve the above technical problems, a new material flow part of a highly wear-resistant slurry pump is provided, which solves the problem that the current flow parts of slurry pumps at home and abroad are all made of high chromium alloy materials. The more representative one is the combination of silicon carbide and silicon nitride. The advantages are good impact resistance and wear resistance and good process flow. The disadvantages are that the processing technology of silicon carbide combined with silicon nitride changes the original hydraulic line. The thickness of the impeller must be increased to meet the process requirements, which may affect the fluid dynamics performance of the pump. The increase in the thickness of the impeller may cause the overall weight of the pump to increase, which not only affects the installation and operation of the pump, but may also have a negative impact on the power efficiency of the pump.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a highly wear-resistant slurry pump new material flow part, including a pump body, an impeller, a sleeve, a front guard plate, a rear guard plate, and an auxiliary impeller. The pump body is formed by wrapping the sleeve with an upper and lower shell and then welding. The sleeve is arranged inside the pump body, and the inner side of the sleeve is coated with a silicon carbide wear-resistant coating. The pump body and the sleeve are inlaid into one by high-temperature adhesive bonding. The front guard plate and the rear guard plate are respectively fixedly installed on the front and rear sides of the pump body by bolts. The impeller is rotatably connected to the inside of the pump body through a rotating shaft. The auxiliary impeller is fixedly connected to the rear side of the impeller and is located inside the pump body. The pump body, impeller, sleeve, front guard plate, rear guard plate, and auxiliary impeller are all formed by grouting molding and sintering of silicon carbide composite materials.

[0006] Preferably, at least eight first bolt fastening seats are annularly arranged on the front side of the pump body, at least four second bolt fastening seats are annularly arranged on the rear side of the pump body, a feed inlet is opened at the center position of the front side of the pump body, a discharge port is arranged on one side of the pump body, and a connecting flange is fixedly connected to the pump body and the discharge port.

[0007] Preferably, the sleeve is provided with a medium inlet and outlet hole and a pump shaft matching hole.

[0008] Preferably, the front side of the impeller is open, and five evenly distributed diffusion channels are arranged inside the impeller.

[0009] Preferably, the auxiliary impeller is provided with a plurality of blades distributed at intervals on both the front and rear sides, and the blades are arc-shaped and correspond one to one, and the arc length of the arc at the end of the blade extending along the outer circumference of the auxiliary impeller is L=πD / 10~πD / 20, where D is the outer diameter of the auxiliary impeller.

[0010] Preferably, a concave surface is provided on one side of the auxiliary impeller, and a hole is opened at the center of the concave surface.

[0011] Preferably, sealing bosses are provided on the inner sides of the front guard plate and the rear guard plate, the sealing bosses are in radial contact and connection with the pump body, and O-rings are provided on the radial contact surfaces between the sealing bosses and the pump casing.

[0012] A method for preparing a silicon carbide composite material comprises the following steps: S1: Add water-based carbon black, crystalline silicon cutting waste mortar powder with a Si content of 98%, and chitosan to the cooled PVA solution in a mass ratio of 4:2:1, and add diluted acetic acid solution (1 mol / L, mass fraction 10%), and stir magnetically for 24 hours to obtain a uniform suspension. The suspension is evenly injected into a cylindrical mold, frozen at -100°C for 5 minutes, transferred to a freeze dryer, set the temperature to -50°C, and dried for 24 hours to obtain a three-dimensional carbon source-containing powder skeleton: S2: Waste slurry from crystalline silicon cutting with a Si content of 23.5%, a SiC content of 74%, and a Fe content of 2.5% was mixed with quartz sand in a mass ratio of 1:1, and put into a ball mill at a ball-to-material ratio of 20:1, and then ball milled on a planetary ball mill at a speed of 340 r / min for 20 h to obtain a uniform mixed silicon source powder; S3: The mixed silicon source powder and the three-dimensional carbon source powder skeleton are sequentially placed in a graphite mold of a spark plasma sintering system (SPS), and the temperature is rapidly raised to 1200-1500°C at 100°C / min in an argon atmosphere, and high-temperature reaction sintering is performed for 20 minutes, and the temperature is kept at 700°C for 2 hours in an air atmosphere to remove carbon and obtain a silicon carbide material with a three-dimensional structure; S4: EP, 4-methylhexahydrophthalic anhydride and imidazole were mixed in a mass ratio of 100:86:1, heated to 60°C and magnetically stirred at 700 r / min for 1 hour to obtain a uniformly mixed EP solution. The silicon carbide material with a three-dimensional structure was completely placed in the EP mixed solution and stored in a vacuum oven at 60°C for 2 hours to remove bubbles. The silicon carbide composite material was cured at 80°C and 120°C for 2 hours respectively.

[0013] Compared with the prior art, the advantages of the present invention are: the present invention adopts silicon carbide composite materials to make the flow parts of the slurry pump, thereby increasing the impact resistance of silicon carbide without changing its hydraulic line, which means that when pumping abrasive and corrosive slurries containing solid particles, the flow parts can better resist impact loads, reduce damage caused by impact, and improve the overall reliability and stability of the pump. The silicon carbide composite material flow parts can significantly extend the service life of the slurry pump under harsh working conditions (such as highly corrosive and abrasive media), and can greatly reduce the frequency of equipment replacement and operation and maintenance costs. Due to the high hardness and good wear resistance of the silicon carbide composite material, the noise and vibration generated by wear during the operation of the pump will be significantly reduced, which not only improves the working environment of the pump station, but also helps to extend the service life of the pump and its supporting equipment. The composite material prepared by the present invention ensures the high wear resistance of silicon carbide and solves the shortcomings of silicon carbide being fragile and not impact-resistant. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the connection between the pump body and the sheath of the present invention; Figure 2 It is a schematic diagram of the sheath structure in the present invention; Figure 3 It is a schematic diagram of the front guard plate structure in the present invention; Figure 4 It is a schematic diagram of the rear guard plate structure in the present invention; Figure 5 It is a schematic diagram of the auxiliary impeller structure in the present invention; Figure 6It is a schematic diagram of the impeller structure in the present invention.

[0015] The numbers in the figure are: 1. Pump body; 2. Impeller; 3. Jacket; 4. Front guard plate; 5. Rear guard plate; 6. Auxiliary impeller; 601. Blade; 602. Inner concave surface; 7. First bolt fastening seat; 8. Second bolt fastening seat; 9. Connecting flange; 10. Feed inlet; 11. Discharge outlet. DETAILED DESCRIPTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0017] Reference Figure 1-6 As shown, a highly wear-resistant slurry pump new material flow part includes a pump body 1, an impeller 2, a jacket 3, a front guard plate 4, a rear guard plate 5, and an auxiliary impeller 6. The pump body 1 is formed by wrapping the jacket 3 with an upper and lower shell body and then welding it. The upper and lower shell bodies wrap the jacket 3 and then weld it, which enhances the overall strength and sealing of the pump body 1, effectively prevents medium leakage, and improves the durability and safety of the pump body 1. The jacket 3 is arranged inside the pump body 1, and the inner side of the jacket 3 is coated with a silicon carbide wear-resistant coating. The coated silicon carbide wear-resistant coating has extremely high hardness and wear resistance, can significantly resist the scouring and wear of solid particles in the slurry, and prolongs the service life of the pump body 1. In order to extend the service life, the pump body 1 and the jacket 3 are bonded and inlaid into one by high-temperature adhesive. The pump body 1 and the jacket 3 are bonded and inlaid into one by high-temperature adhesive. This connection method not only ensures the firmness of the connection, but also avoids the thermal stress problem that may be caused by welding, and improves the overall performance of the pump body 1. The front guard plate 4 and the rear guard plate 5 are respectively fixed on the front and rear sides of the pump body 1 by bolts. The impeller 2 is connected to the inside of the pump body 1 through a rotating shaft. The auxiliary impeller 6 is fixedly connected to the rear side of the impeller 2 and is located inside the pump body 1. The pump body 1, impeller 2, jacket 3, front guard plate 4, rear guard plate 5, and auxiliary impeller 6 are all made of silicon carbide composite material by grouting molding and sintering.

[0018] Please refer to Figure 1 As shown, at least eight first bolt fastening seats 7 are annularly arranged on the front side of the pump body 1, at least four second bolt fastening seats 8 are annularly arranged on the rear side of the pump body 1, a feed inlet 10 is opened at the center position of the front side of the pump body 1, a discharge port 11 is arranged on one side of the pump body 1, and a connecting flange 9 is fixedly connected to the pump body 1 and the discharge port 11.

[0019] Please refer to Figure 2 As shown, the sleeve 3 is provided with a medium inlet and outlet hole and a pump shaft matching hole. The medium inlet and outlet hole and the pump shaft matching hole provided on the sleeve 3 ensure that the medium can smoothly enter and exit the pump body, and ensure the precise installation and stable operation of the pump shaft.

[0020] Please refer to Figure 6 As shown, the front side of the impeller 2 is open, and the open structure is conducive to the smooth entry of the medium into the impeller 2, reducing flow resistance and improving the efficiency of the pump. Five evenly distributed diffusion flow channels are arranged inside the impeller 2. The five evenly distributed diffusion flow channels can optimize the flow path of the medium, reduce eddy currents and energy losses, and improve the hydraulic performance of the pump.

[0021] Please refer to Figure 5 As shown, a plurality of blades 601 are provided at intervals on both sides of the front and rear of the auxiliary impeller 6, and the blades 601 are arc-shaped and correspond one to one. The blades 601 of the auxiliary impeller 6 are arc-shaped and correspond one to one. This design can more effectively disperse and balance the axial force generated by the impeller, reduce the axial vibration and noise of the pump, and the arc length of the end of the blade 601 extending along the outer circumference of the auxiliary impeller 6 is L=πD / 10~πD / 20, where D is the outer diameter of the auxiliary impeller 6. The arc length is accurately calculated, which can reduce wear while ensuring efficiency and increase the service life of the auxiliary impeller 6.

[0022] Please refer to Figure 5 As shown, an inner concave surface 602 is provided on one side of the auxiliary impeller 6, and a hole is opened in the center of the inner concave surface 602. The inner concave surface 602 and the center hole provided on one side of the auxiliary impeller 6 are helpful to improve the flow state of the medium and reduce eddy current and energy loss.

[0023] Please refer to Figure 3 and Figure 4 As shown, sealing bosses are provided on the inner sides of the front guard plate 4 and the rear guard plate 5, and the sealing bosses are radially in contact with the pump body 1. O-rings are provided on the radial contact surfaces between the sealing bosses and the pump casing. The sealing bosses provided on the inner sides of the front guard plate 4 and the rear guard plate 5 are radially in contact with the pump body 1 and are equipped with O-rings. This design effectively prevents leakage of the medium and improves the sealing performance of the pump.

[0024] A method for preparing a silicon carbide composite material comprises the following steps: S1: Add water-based carbon black, crystalline silicon cutting waste mortar powder with a Si content of 98%, and chitosan to the cooled PVA solution in a mass ratio of 4:2:1, and add diluted acetic acid solution (1 mol / L, mass fraction 10%), and stir magnetically for 24 hours to obtain a uniform suspension. The suspension is evenly injected into a cylindrical mold, frozen at -100°C for 5 minutes, transferred to a freeze dryer, set the temperature to -50°C, and dried for 24 hours to obtain a three-dimensional carbon source powder skeleton. The three-dimensional carbon source powder skeleton prepared by freeze drying has a uniform pore structure and good mechanical strength, providing a good template for the subsequent silicon carbide generation; S2: Crystal silicon cutting waste slurry with Si content of 23.5%, SiC content of 74% and Fe content of 2.5% and quartz sand are mixed in a mass ratio of 1:1, and put into a ball mill at a ball-to-material ratio of 20:1. After ball milling for 20 hours at a speed of 340r / min on a planetary ball mill, a uniform mixed silicon source powder is obtained. The mixed silicon source powder prepared by using crystal silicon cutting waste slurry and quartz sand not only reduces the cost, but also realizes uniform mixing of the powder through ball milling treatment, thereby improving the performance of the silicon carbide material after sintering; S3: The mixed silicon source powder and the three-dimensional carbon source powder skeleton are sequentially placed in the graphite mold of the spark plasma sintering system (SPS). In an argon atmosphere, the temperature is rapidly raised to 1200-1500°C at 100°C / min, and high-temperature reaction sintering is performed for 20 minutes. The mixture is kept at 700°C in an air atmosphere for 2 hours to remove carbon and obtain a silicon carbide material with a three-dimensional structure. The spark plasma sintering system (SPS) is used for high-temperature reaction sintering, which has the advantages of fast heating speed, short sintering time, and low energy consumption, and can prepare silicon carbide materials with excellent performance. S4: EP, 4-methylhexahydrophthalic anhydride and imidazole were mixed in a mass ratio of 100:86:1, heated to 60°C and magnetically stirred at 700r / min for 1h to obtain a uniformly mixed EP solution. The silicon carbide material with a three-dimensional structure was completely placed in the EP mixed solution and stored in a vacuum oven at 60°C for 2h to remove bubbles. The silicon carbide composite material was obtained by curing at 80°C and 120°C for 2h respectively. The silicon carbide material was impregnated with the EP mixed solution to improve the toughness and impact resistance of the material, solving the shortcomings of silicon carbide being fragile and not impact-resistant.

[0025] Working principle: By using silicon carbide composite materials to make the flow parts of the slurry pump, the impact resistance of silicon carbide is increased without changing its hydraulic line. This means that when pumping abrasive and corrosive slurries containing solid particles, the flow parts can better resist impact loads, reduce damage caused by impact, and improve the overall reliability and stability of the pump. The silicon carbide composite material flow parts can significantly extend the service life of the slurry pump under harsh working conditions (such as highly corrosive and abrasive media), and can greatly reduce the frequency of equipment replacement and operation and maintenance costs. Due to the high hardness and good wear resistance of the silicon carbide composite material, the noise and vibration generated by wear during the operation of the pump will be significantly reduced, which not only improves the working environment of the pump station, but also helps to extend the service life of the pump and its supporting equipment. The composite material prepared by the present invention ensures the high wear resistance of silicon carbide and solves the shortcomings of silicon carbide being fragile and not resistant to impact.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A highly wear-resistant slurry pump new material flow part, characterized by: The invention comprises a pump body (1), an impeller (2), a jacket (3), a front guard plate (4), a rear guard plate (5), and an auxiliary impeller (6); the pump body (1) is formed by welding the jacket (3) with an upper and lower shell body, the jacket (3) being arranged inside the pump body (1), and the inner side of the jacket (3) being coated with a silicon carbide wear-resistant coating; the pump body (1) and the jacket (3) are inlaid into one piece by high-temperature adhesive bonding; the front guard plate (4) and the rear guard plate (5) are respectively fixedly mounted on the front and rear sides of the pump body (1) by bolts; the impeller (2) is rotatably connected to the inside of the pump body (1) by a rotating shaft; the auxiliary impeller (6) is fixedly connected to the rear side of the impeller (2) and is located inside the pump body (1); the pump body (1), the impeller (2), the jacket (3), the front guard plate (4), the rear guard plate (5), and the auxiliary impeller (6) are all formed by slurry injection molding and sintering of a silicon carbide composite material.

2. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: The front side of the pump body (1) is provided with at least eight first bolt fastening seats (7) in an annular shape, the rear side of the pump body (1) is provided with at least four second bolt fastening seats (8) in an annular shape, a feed inlet (10) is provided at the center position of the front side of the pump body (1), a discharge port (11) is provided at one side of the pump body (1), and a connecting flange (9) is fixedly connected to the pump body (1) and the discharge port (11).

3. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: The sleeve (3) is provided with a medium inlet and outlet hole and a pump shaft matching hole.

4. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: The front side of the impeller (2) is open, and five evenly distributed diffusion channels are arranged inside the impeller (2).

5. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: A plurality of blades (601) are arranged at intervals on both the front and rear sides of the auxiliary impeller (6), and the blades (601) are arc-shaped and correspond one to one. The length of the arc extending from the ends of the blades (601) along the outer circumference of the auxiliary impeller (6) is L=πD / 10 to πD / 20, wherein D is the outer diameter of the auxiliary impeller (6).

6. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: An inner concave surface (602) is provided on one side of the auxiliary impeller (6), and a hole is provided at the center of the inner concave surface (602).

7. The highly wear-resistant slurry pump new material flow-through part according to claim 1 is characterized in that: The front guard plate (4) and the rear guard plate (5) are both provided with sealing bosses on their inner sides. The sealing bosses are in radial contact with the pump body (1), and an O-ring is provided on the radial contact surface between the sealing bosses and the pump housing.

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