Flexible mounting assembly for chemical pump shaft repair with silicon carbide bushing

Abstract

The application relates to the polycrystalline silicon technical field and discloses a flexible mounting assembly of a silicon carbide shaft sleeve for repairing a chemical pump shaft, which comprises a pump shaft body and a shaft sleeve; the shaft sleeve is made of silicon carbide; the pump shaft body is provided with a reduced diameter shaft neck formed by turning off a corrosion layer; an elastic transition sleeve is arranged on the side wall of the reduced diameter shaft neck; the inner side wall of the elastic transition sleeve is matched with the outer side wall of the reduced diameter shaft neck; the outer side wall of the elastic transition sleeve is matched with the inner side wall of the shaft sleeve; the elastic transition sleeve comprises a plurality of supporting sections arranged in the axial direction and elastic deformation sections located between the adjacent supporting sections; the outer diameter of the elastic deformation section is smaller than that of the supporting section, so that the elastic deformation section can be deformed in the radial direction. The supporting sections of the elastic transition sleeve ensure the centering of the silicon carbide shaft sleeve, the elastic deformation sections absorb assembly errors, running vibration and the difference in thermal expansion between metal and ceramic, and stress concentration of the ceramic shaft sleeve due to rigid constraint is avoided.

Description

Technical Field

[0001] This invention relates to the field of polysilicon technology, and in particular to a flexible mounting assembly for silicon carbide bushings used in the repair of chemical pump shafts. Background Technology

[0002] In the polysilicon production process, chemical pumps often transport corrosive and abrasive media containing chlorosilanes, hydrochloric acid, and solid silicon powder. As a key part that mates with seals, bearings, and impellers, the pump shaft journal is prone to corrosion and wear after long-term operation, leading to a reduction in shaft diameter, failure of fit, and affecting the safe operation of the equipment.

[0003] Currently, the main repair methods for pump shaft journal corrosion and wear are replacing the entire shaft, welding or spraying a metal wear-resistant layer, and installing a metal bushing. However, all of these methods have problems such as insufficient corrosion and wear resistance, easy loosening, high cost, and short service life. In recent years, silicon carbide ceramic materials have been used in chemical pump shafts and impellers due to their excellent corrosion resistance, high hardness, and erosion resistance. However, when using integral silicon carbide bushings for pump shaft journal repair, the rigid interference fit and radial through pin connection are prone to stress concentration on the bushing due to the high brittleness of silicon carbide ceramics and the fact that its coefficient of thermal expansion is much smaller than that of metal materials. This can lead to bushing cracking, and corrosive media can easily seep into the pin hole, causing crevice corrosion. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantage that rigid interference fit and radial through pin connection are prone to stress concentration on the bushing, which leads to bushing cracking. At the same time, corrosive media can easily seep into the pin hole, causing crevice corrosion and loosening. To this end, we propose a flexible mounting component for silicon carbide bushing for chemical pump shaft repair.

[0005] To achieve the above objectives, this application adopts the following technical solution: a flexible mounting assembly for a silicon carbide bushing for repairing a chemical pump shaft, comprising a pump shaft body and a bushing, wherein the bushing is made of silicon carbide, the pump shaft body has a reduced-diameter journal formed by machining to remove the corrosion layer, an elastic transition sleeve is fitted on the side wall of the reduced-diameter journal, the inner side wall of the elastic transition sleeve mates with the outer side wall of the reduced-diameter journal, and the outer side wall of the elastic transition sleeve mates with the inner side wall of the bushing, the elastic transition sleeve includes multiple support sections arranged axially and an elastic deformation section located between adjacent support sections, the outer diameter of the elastic deformation section is smaller than the outer diameter of the support section, so that the elastic deformation section can deform radially, multiple radial anti-rotation pins are embedded between the outer side wall of the reduced-diameter journal and the inner side walls of the multiple support sections, and the outer side walls of the multiple support sections are connected to the inner wall of the bushing through multiple arc-shaped anti-rotation pins for circumferential positioning of the bushing and the elastic transition sleeve.

[0006] Preferably, the plurality of support sections are made of stainless steel, the outer circular surface of the support section is provided with a wear-resistant coating, and the elastic deformation section is a thin-walled corrugated pipe section.

[0007] Preferably, the arc-shaped anti-rotation pin includes multiple arc-shaped plates, each of which has a receiving groove on its inner sidewall. Each of the receiving grooves has an arc-shaped pin slidably connected to its inner wall. The inner wall of the receiving groove is elastically connected to the corresponding arc-shaped pin sidewall by multiple telescopic springs.

[0008] Preferably, the inner sidewall of the bushing is provided with a first arc-shaped groove that mates with a plurality of arc-shaped plates, and the outer sidewalls of the plurality of support sections are provided with a plurality of second arc-shaped grooves that correspond to the plurality of first arc-shaped grooves. The plurality of arc-shaped plates are respectively embedded in the plurality of first arc-shaped grooves, and the plurality of arc-shaped pins extend radially under the action of the telescopic spring and are respectively embedded in the plurality of second arc-shaped grooves to achieve radial engagement.

[0009] Preferably, the outer wall of the bushing is provided with a first annular groove, and an L-shaped positioning ring is fitted to the side wall of the first annular groove. The elastic transition sleeve and the bushing are both fitted to the side wall of the L-shaped positioning ring on the same side. The radial extension wall of the L-shaped positioning ring is threaded to the end face of the pump shaft body by a plurality of first screws, and the axial extension wall of the L-shaped positioning ring is threaded to the outer wall of the bushing by a plurality of second screws.

[0010] Preferably, the pump shaft body has a second annular groove on the outer side wall away from the L-shaped positioning ring, and an elastic pre-compression mechanism is provided on the second annular groove. The elastic pre-compression mechanism includes a ring that fits against the outer side wall of the second annular groove, and the side wall of the ring is threadedly connected to the side wall of the pump shaft body by a plurality of third screws.

[0011] Preferably, the annular groove is formed on the side wall of the ring near the bushing, and a compression ring is slidably connected to the inner wall of the annular groove. The inner wall of the annular groove is elastically connected to the side wall of the compression ring through a disc spring, and a friction ring is fixedly connected to the side wall of the compression ring away from the disc spring.

[0012] Preferably, the bushing has a T-shaped groove on the side wall near the L-shaped positioning ring and the friction ring, and both the L-shaped positioning ring and the friction ring have a corrosion-proof sealing mechanism that cooperates with the T-shaped groove on the side wall near the bushing.

[0013] Preferably, the corrosion-resistant sealing mechanism includes rigid support rings fixedly connected to the L-shaped positioning ring and the friction ring near the bushing sidewall. The rigid support ring near the bushing sidewall is fixedly connected to a flexible filling ring. Each flexible filling ring is filled with hydraulic oil. When the flexible filling ring is compressed, it expands radially and fits and seals against the inner wall of the T-shaped ring groove. The flexible filling ring is made of fluororubber or perfluoroether rubber.

[0014] Preferably, the outer diameters of the pump shaft body, bushing, L-shaped positioning ring, and friction ring are the same.

[0015] The technical effects and advantages of this invention are as follows: 1. The support section of the elastic transition sleeve ensures the centering of the silicon carbide bushing, while the elastic deformation section absorbs assembly errors, running vibrations, and the thermal expansion difference between the metal and ceramic, thus avoiding stress concentration in the ceramic bushing due to rigid constraints.

[0016] 2. The arc-shaped anti-rotation pin is located within the mating interface and does not penetrate the outer circle of the silicon carbide bushing, avoiding the weakening of ceramic strength and stress concentration caused by radial through holes. The arc-shaped anti-rotation pin adopts an elastic radial engagement structure, which automatically engages during assembly without the need for radial screws, further reducing the stress on the ceramic.

[0017] 3. The disc spring applies axial preload to the friction ring through the compression ring, so that a normal positive pressure is generated between the friction ring and the end face of the bushing. The torque of the pump shaft body during operation is transmitted by the friction torque formed by this positive pressure and the friction coefficient. The arc-shaped anti-rotation pin only undertakes the auxiliary anti-rotation and positioning functions, reduces the shear stress borne by the bushing, and avoids the bushing from cracking due to localized concentrated stress.

[0018] 4. Because the disc spring has elastic compensation capability, when the end face of the friction ring wears and thins, the disc spring automatically extends to maintain the axial preload basically unchanged, ensuring that the friction torque is always greater than the running torque. As a replaceable wear part, the friction ring concentrates the wear on itself, protects the end face of the bushing, and extends the service life of the bushing.

[0019] 5. The corrosion-resistant sealing mechanism is located at both ends of the silicon carbide bushing to prevent corrosive media from entering the interface between the metal and ceramic and to avoid crevice corrosion. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the structure of a flexible mounting assembly for a silicon carbide bushing used for repairing a chemical pump shaft according to the present invention. Figure 2 This is a schematic diagram of the structure of the pump shaft after separation from the elastic transition sleeve in a flexible mounting assembly for repairing a chemical pump shaft according to the present invention. Figure 3 This is a schematic diagram of the structure of the flexible mounting assembly for repairing a chemical pump shaft using a silicon carbide bushing after separation of the bushing, L-shaped positioning ring, and elastic preload mechanism. Figure 4 for Figure 1 A schematic diagram of the vertical sectional structure; Figure 5 for Figure 4 Enlarged structural diagram at point A; Figure 6 for Figure 1A schematic diagram of the vertical sectional structure on the right; Figure 7 for Figure 6 Enlarged structural diagram at point B; Figure 8 for Figure 4 Enlarged schematic diagram of the structure at point C; Figure 9 for Figure 4 Enlarged structural diagram at point D; Figure 10 for Figure 3 Enlarged structural diagram at point E; Figure 11 for Figure 8 Enlarged structural diagram at point F; Figure 12 This is a schematic diagram of the structure of the arc-shaped retaining pin after separation in a flexible mounting assembly for silicon carbide bushings used for repairing chemical pump shafts according to the present invention.

[0021] Legend: 1. Pump shaft body; 2. Reduced diameter journal; 3. Support section; 4. Elastic deformation section; 5. Radial anti-rotation pin; 6. Bushing; 7. First arc-shaped groove; 8. Second arc-shaped groove; 9. Arc plate; 10. Receiving groove; 11. Arc pin; 12. First annular groove; 13. L-shaped positioning ring; 14. First screw; 15. Second screw; 16. Second annular groove; 17. Circular ring; 18. Third screw; 19. Annular groove; 20. Compression ring; 21. Friction ring; 22. Disc spring; 23. T-shaped ring groove; 24. Rigid support ring; 25. Flexible filling ring; 26. Telescopic spring. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0023] Reference Figures 1-12As shown, the present invention provides a technical solution: a flexible mounting assembly for a silicon carbide bushing for repairing a chemical pump shaft, comprising a pump shaft body 1 and a bushing 6. The bushing 6 is made of silicon carbide, and the outer diameter of the bushing 6 is consistent with the outer diameter of the journal of the pump shaft body 1 to restore the original fit dimensions of the pump shaft. The pump shaft body 1 is a metal pump shaft of a chemical pump. Its journal section is corroded and worn due to long-term transportation of fluids containing corrosive media and solid particles. During repair, the corroded and worn journal section is machined by pure mechanical turning to remove the corrosion layer and form a reduced-diameter journal 2. The outer diameter of the reduced-diameter journal 2 is smaller than that of the original design journal, and the difference in radius between the two forms a radial installation space. The surface of the reduced-diameter journal 2 has no weld overlay or sprayed weld layer, the machining tolerance is h6 grade, and the surface roughness Ra≤0.8μm.

[0024] The reduced diameter journal 2 is fitted with an elastic transition sleeve on its side wall. The inner side wall of the elastic transition sleeve mates with the outer side wall of the reduced diameter journal 2, and the outer side wall of the elastic transition sleeve mates with the inner side wall of the bushing 6. The elastic transition sleeve includes multiple support sections 3 arranged axially and elastic deformation sections 4 located between adjacent support sections 3. The outer circle of the support section 3 mates with the inner hole of the bushing 6 for radial centering. The outer diameter of the elastic deformation section 4 is smaller than the outer diameter of the support section 3, so that the elastic deformation section 4 can deform radially. Multiple radial anti-rotation pins 5 are embedded between the outer side wall of the reduced diameter journal 2 and the inner side walls of the multiple support sections 3.

[0025] The outer walls of multiple support sections 3 are connected to the inner wall of bushing 6 by multiple arc-shaped anti-rotation pins, which are used for circumferential positioning of bushing 6 and elastic transition sleeve.

[0026] Multiple support sections 3 are made of stainless steel. The outer surface of the support section 3 is coated with a wear-resistant coating, such as a molybdenum disulfide coating or a diamond-like coating, to reduce friction and wear between it and the inner wall of the bushing 6. The elastic deformation section 4 is a thin-walled bellows section, which allows it to undergo elastic deformation in the radial direction, thereby absorbing the thermal expansion difference, assembly error and operating vibration between the pump shaft body 1 and the bushing 6.

[0027] Furthermore, the radial anti-rotation pin 5 is a cylindrical pin or a rectangular key, which is embedded radially into the corresponding pin grooves on the outer wall of the reduced diameter journal 2 and the inner wall of the support section 3 to prevent the elastic transition sleeve from rotating circumferentially relative to the pump shaft body 1. The radial anti-rotation pins 5 are evenly distributed along the circumference, with a quantity of 2-4. Since the elastic transition sleeve is made of metal, the radial anti-rotation pins 5 will not cause stress concentration problems to it, and the radial anti-rotation pins 5 do not directly contact the silicon carbide bushing 6, so they will not affect the ceramic components.

[0028] The arc-shaped anti-rotation pin includes multiple arc-shaped plates 9, each with a receiving groove 10 on its inner sidewall. Each receiving groove 10 has an arc-shaped pin 11 slidably connected to its inner wall. The inner wall of the receiving groove 10 is elastically connected to the sidewall of its corresponding arc-shaped pin 11 by multiple telescopic springs 26.

[0029] The inner wall of the bushing 6 is provided with a first arc-shaped groove 7 that mates with a plurality of arc-shaped plates 9. The outer walls of the plurality of support sections 3 are provided with a plurality of second arc-shaped grooves 8 that correspond to the plurality of first arc-shaped grooves 7. The plurality of arc-shaped plates 9 are respectively embedded in the plurality of first arc-shaped grooves 7. The plurality of arc-shaped pins 11 extend radially under the action of the telescopic spring and are respectively embedded in the plurality of second arc-shaped grooves 8 to achieve radial engagement.

[0030] During assembly, the arc plate 9 is pre-embedded in the first arc groove 7, and the arc pin 11 is in a radially extended state under the action of the telescopic spring 26. When the bushing 6 is axially fitted onto the outside of the elastic transition sleeve, the outer wall of the support section 3 of the elastic transition sleeve first contacts the extended end of the arc pin 11, pressing the arc pin 11 radially back into the receiving groove 10. When the bushing 6 continues to move axially until the first arc groove 7 and the second arc groove 8 are radially aligned, the arc pin 11 automatically extends radially under the elastic force of the telescopic spring 26 and is embedded in the second arc groove 8, achieving radial engagement. At this time, the arc plate 9 is locked in the first arc groove 7 of the bushing 6, and the arc pin 11 is locked in the second arc groove 8 of the elastic transition sleeve. The two work together to form a reliable circumferential limit between the bushing 6 and the elastic transition sleeve. At the same time, the radial elastic extension and contraction of the arc pin 11 can adapt to small radial displacements and vibrations, avoiding the bushing 6 from being subjected to rigid shear force.

[0031] The outer wall of the bushing 6 has a first annular groove 12. An L-shaped positioning ring 13 is fitted to the side wall of the first annular groove 12. The elastic transition sleeve and the bushing 6 are both fitted to the side wall of the L-shaped positioning ring 13 on the same side. The radial extension wall of the L-shaped positioning ring 13 is threaded to the end face of the pump shaft body 1 by a plurality of first screws 14. The axial extension wall of the L-shaped positioning ring 13 is threaded to the outer wall of the bushing 6 by a plurality of second screws 15.

[0032] It should be noted that a metal threaded sleeve (not shown in the figure) is pre-fixed to the side wall of the first annular groove 12 by brazing or mechanical inlay. The metal threaded sleeve is made of an alloy with a thermal expansion coefficient similar to that of silicon carbide. Multiple second screws 15 are threadedly connected to the metal threaded sleeve to achieve axial fixation.

[0033] A second annular groove 16 is provided on the outer side wall of the pump shaft body 1 away from the L-shaped positioning ring 13. An elastic preload mechanism is provided on the second annular groove 16. The elastic preload mechanism includes a ring 17 that fits against the outer side wall of the second annular groove 16. The side wall of the ring 17 is threadedly connected to the side wall of the pump shaft body 1 by a plurality of third screws 18.

[0034] The annular groove 19 is provided on the side wall of the ring 17 near the bushing 6. The inner wall of the annular groove 19 is slidably connected to the compression ring 20. The inner wall of the annular groove 19 is elastically connected to the side wall of the compression ring 20 through the disc spring 22. The side wall of the compression ring 20 away from the disc spring 22 is fixedly connected to the friction ring 21.

[0035] Furthermore, the disc spring 22 is a disc spring assembly composed of multiple disc spring plates stacked or paired, and the friction ring 21 is an annular friction plate made of wear-resistant alloy or ceramic matrix composite material, with radial grooves or a high friction coefficient coating on its surface.

[0036] The disc spring 22 applies axial preload to the friction ring 21 through the compression ring 20, generating normal pressure between the friction ring 21 and the end face of the bushing 6. The torque of the pump shaft body 1 during operation is transmitted by the frictional torque formed by this normal pressure and the friction coefficient. The arc-shaped anti-rotation pin only undertakes auxiliary anti-rotation and positioning functions, reducing the shear stress borne by the bushing 6 and preventing the bushing 6 from cracking due to localized concentrated stress. At the same time, the friction ring 21 and the end face of the silicon carbide bushing 6 may experience slight wear during operation. Due to the elastic compensation capability of the disc spring 22, when the end face of the friction ring 21 wears thinner, the disc spring 22 automatically extends to maintain the axial preload basically unchanged, ensuring that the frictional torque is always greater than the operating torque. As a replaceable wear part, the friction ring 21 concentrates the wear on itself, protects the end face of the bushing 6, and extends the service life of the bushing 6.

[0037] The bushing 6 has a T-shaped ring groove 23 on the side wall near the L-shaped positioning ring 13 and the friction ring 21. The L-shaped positioning ring 13 and the friction ring 21 are both provided with corrosion-proof sealing mechanisms that cooperate with the T-shaped ring groove 23 on the side wall near the bushing 6.

[0038] The corrosion-resistant sealing mechanism includes a rigid support ring 24 that is fixedly connected to the L-shaped positioning ring 13 and the friction ring 21 near the side wall of the bushing 6. A flexible filling ring 25 is fixedly connected to the side wall of the rigid support ring 24 near the bushing 6. Hydraulic oil is provided inside the flexible filling ring 25. The hydraulic oil is a corrosion-resistant and non-volatile synthetic oil, such as perfluoropolyether oil. After being compressed, the flexible filling ring 25 expands radially and fits against the inner wall of the T-shaped ring groove 23 to seal. The flexible filling ring 25 is made of fluororubber or perfluoroether rubber, which has good corrosion resistance and elasticity.

[0039] When not under pressure, the flexible filler ring 25 is in a relaxed state and can be inserted into the T-shaped ring groove 23 along with the rigid support ring 24. When the axial preload is applied, the L-shaped positioning ring 13 and the friction ring 21 are pressed against the end face of the bushing 6. The rigid support ring 24 drives the flexible filler ring 25 into the T-shaped ring groove 23. After being squeezed, the flexible filler ring 25 expands radially and fits tightly against the inner wall of the T-shaped ring groove 23, forming a radial seal and an end face seal to prevent corrosive media from entering the mating interface between the bushing 6 and the elastic transition sleeve.

[0040] The outer diameters of the pump shaft body 1, shaft sleeve 6, L-shaped positioning ring 13, and friction ring 21 are consistent, all being the original design journal outer diameters, ensuring that the repaired pump shaft fits well with the original sealing rings and bearings and other components.

[0041] In this invention, the installation steps of the pump shaft body 1 and the bushing 6 are as follows: First, the corroded and worn journal section of the pump shaft body 1 is machined by pure mechanical turning to remove the corrosion layer and form a reduced diameter journal 2. Then, an elastic transition sleeve is fitted on the outside of the reduced diameter journal 2 so that the inner hole of the support section 3 of the elastic transition sleeve fits with the outer circle of the reduced diameter journal 2. At the same time, a radial anti-rotation pin 5 is installed radially to fix the reduced diameter journal 2 and the elastic transition sleeve circumferentially. Then, the ring 17 is fitted into the second annular groove 16 of the pump shaft body 1 and fixed by the third screw 18. At this time, the friction ring 21 faces one end of the shaft sleeve 6. Then, each arc plate 9 of the arc anti-rotation pin is pre-embedded into the first arc groove 7 of the inner wall of the silicon carbide bushing 6. At this time, the arc pin 11 is in a radially extended state under the action of the telescopic spring 26. When the bushing 6 is axially fitted onto the outside of the elastic transition sleeve, the outer wall of the support section 3 of the elastic transition sleeve first contacts the protruding end of the arc-shaped pin 11, pressing the arc-shaped pin 11 radially back into the receiving groove 10. When the bushing 6 continues to move axially until the first arc-shaped groove 7 and the second arc-shaped groove 8 are radially aligned, the arc-shaped pin 11 automatically extends radially under the elastic force of the telescopic spring 26 and is embedded in the second arc-shaped groove 8, achieving radial engagement. At this time, the arc-shaped plate 9 is locked in the first arc-shaped groove 7 of the bushing 6, and the arc-shaped pin 11 is locked in the second arc-shaped groove 8 of the elastic transition sleeve. The two work together to form a reliable circumferential limit between the bushing 6 and the elastic transition sleeve. At the same time, the radial elastic extension and contraction of the arc-shaped pin 11 can adapt to small radial displacements and vibrations, avoiding the bushing 6 from being subjected to rigid shear force. The L-shaped positioning ring 13 is then installed on the first annular groove 12 and the pump shaft body 1 using multiple first screws 14 and multiple second screws 15. After the bushing 6 and the L-shaped positioning ring 13 are installed, the two flexible filling rings 25 are inserted into the two T-shaped ring grooves 23 respectively through the two rigid support rings 24. When the bushing 6 applies pressure to the friction ring 21 and the L-shaped positioning ring 13 applies pressure to the bushing 6, the rigid support ring 24 drives the flexible filling ring 25 into the T-shaped ring groove 23. After being squeezed, the flexible filling ring 25 expands radially and fits tightly against the inner wall of the T-shaped ring groove 23, forming a radial seal and an end face seal to prevent corrosive media from entering the mating interface between the bushing 6 and the elastic transition sleeve.

[0042] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A flexible mounting assembly for silicon carbide bushings used in the repair of chemical pump shafts, characterized in that, The pump shaft includes a pump shaft body and a bushing. The bushing is made of silicon carbide. The pump shaft body has a reduced-diameter journal formed by machining to remove the corrosion layer. An elastic transition sleeve is fitted on the side wall of the reduced-diameter journal. The inner side wall of the elastic transition sleeve mates with the outer side wall of the reduced-diameter journal, and the outer side wall of the elastic transition sleeve mates with the inner side wall of the bushing. The elastic transition sleeve includes multiple support sections arranged axially and elastic deformation sections located between adjacent support sections. The outer diameter of the elastic deformation section is smaller than the outer diameter of the support section, allowing the elastic deformation section to deform radially. Multiple radial anti-rotation pins are embedded between the outer side wall of the reduced-diameter journal and the inner side walls of the multiple support sections. The outer side walls of the multiple support sections are connected to the inner wall of the bushing through multiple arc-shaped anti-rotation pins for circumferential positioning of the bushing and the elastic transition sleeve.

2. The flexible mounting assembly for silicon carbide bushings used in chemical pump shaft repair according to claim 1, characterized in that: The multiple support sections are made of stainless steel, and the outer surface of the support section is provided with a wear-resistant coating. The elastic deformation section is a thin-walled corrugated pipe section.

3. The flexible mounting assembly for silicon carbide bushings used in chemical pump shaft repair according to claim 1, characterized in that: The arc-shaped anti-rotation pin includes multiple arc-shaped plates, each with an inner sidewall with a receiving groove, and each receiving groove with an arc-shaped pin slidably connected to its inner wall. The inner wall of the receiving groove is elastically connected to the corresponding sidewall of the arc-shaped pin by multiple telescopic springs.

4. The flexible mounting assembly for silicon carbide bushings used in chemical pump shaft repair according to claim 3, characterized in that: The inner sidewall of the bushing is provided with a first arc-shaped groove that mates with a plurality of arc-shaped plates. The outer sidewalls of the plurality of support sections are provided with a plurality of second arc-shaped grooves that correspond to the plurality of first arc-shaped grooves. The plurality of arc-shaped plates are respectively embedded in the plurality of first arc-shaped grooves. The plurality of arc-shaped pins extend radially under the action of the telescopic spring and are respectively embedded in the plurality of second arc-shaped grooves to achieve radial engagement.

5. The flexible mounting assembly for silicon carbide bushings used in chemical pump shaft repair according to claim 1, characterized in that: The outer wall of the bushing is provided with a first annular groove, and an L-shaped positioning ring is attached to the side wall of the first annular groove. The elastic transition sleeve and the bushing are both attached to the side wall of the L-shaped positioning ring on the same side. The radial extension wall of the L-shaped positioning ring is threaded to the end face of the pump shaft body by a plurality of first screws, and the axial extension wall of the L-shaped positioning ring is threaded to the outer wall of the bushing by a plurality of second screws.

6. The flexible mounting assembly for silicon carbide bushings for repairing chemical pump shafts according to claim 5, characterized in that: The pump shaft body has a second annular groove on its outer side wall away from the L-shaped positioning ring. The second annular groove is provided with an elastic pre-compression mechanism. The elastic pre-compression mechanism includes a ring that fits against the outer side wall of the second annular groove. The side wall of the ring is threaded to the side wall of the pump shaft body by a plurality of third screws.

7. The flexible mounting assembly for silicon carbide bushings for repairing chemical pump shafts according to claim 6, characterized in that: The annular groove is formed on the side wall of the ring near the bushing. A compression ring is slidably connected to the inner wall of the annular groove. The inner wall of the annular groove is elastically connected to the side wall of the compression ring through a disc spring. A friction ring is fixedly connected to the side wall of the compression ring away from the disc spring.

8. The flexible mounting assembly for silicon carbide bushings for repairing chemical pump shafts according to claim 7, characterized in that: The bushing has a T-shaped ring groove on its side wall near the L-shaped positioning ring and the friction ring. The L-shaped positioning ring and the friction ring are both provided with a corrosion-proof sealing mechanism that cooperates with the T-shaped ring groove on their side walls near the bushing.

9. A flexible mounting assembly for a silicon carbide bushing for repairing a chemical pump shaft according to claim 8, characterized in that: The corrosion-resistant sealing mechanism includes rigid support rings that are fixedly connected to the L-shaped positioning ring and the friction ring near the side wall of the bushing, respectively. A flexible filling ring is fixedly connected to the side wall of the rigid support ring near the bushing. Hydraulic oil is provided inside the flexible filling ring. After being compressed, the flexible filling ring expands radially and fits against the inner wall of the T-shaped ring groove for sealing. The flexible filling ring is made of fluororubber or perfluoroether rubber.

10. A flexible mounting assembly for a silicon carbide bushing for repairing a chemical pump shaft according to claim 7, characterized in that: The outer diameters of the pump shaft body, shaft sleeve, L-shaped positioning ring, and friction ring are consistent.

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