Structure and method for repairing sealing end face of water outlet of large submersible pump for steel rolling rotational flow well

Abstract

The invention relates to the technical field of large submersible pump maintenance, and particularly discloses a large submersible pump water outlet sealing end face repairing structure for a steel rolling rotational flow well, which comprises a water pump water outlet and a circular pressing plate, and a metal repairing agent is smeared after the water outlet sealing end face of the water pump water outlet is cleaned. Three positioning nuts are evenly arranged on the outer side of a water outlet of the water pump in the circumferential direction, three leveling screws are arranged at the corresponding positions of the positioning nuts to serve as connecting pieces for adjusting the circular pressing plate, three lug holes are formed in the circular pressing plate according to the distribution positions of the positioning nuts, and the circular pressing plate is matched with the leveling screws to penetrate through and be in threaded connection with the leveling nuts. The leveling nut is locked through the leveling screw to enable the circular pressing plate to be tightly attached to the water outlet sealing end face, the circular pressing plate and the leveling nut press out the water outlet sealing end face of the metal repairing agent filling part, and the levelness of the water outlet sealing end face and the levelness of the repairing face are kept consistent; the method guarantees the precision of the repaired end face, improves the maintenance efficiency, and greatly reduces the repair cost and the construction difficulty.

Description

Technical Field

[0001] The invention relates to the technical field of large submersible pump maintenance, and in particular to a structure and method for repairing a sealing end face of a water outlet of a large submersible pump used in a steel rolling vortex well. Background Art

[0002] The turbid circulating water in the hot rolling production line generally uses a vortex well as the first water treatment process. The vortex well generally uses a lifting water pump to transport the treated water to the next treatment unit. The turbid circulating water consumption of large-scale steel rolling production lines is huge, generally reaching 10,000m 3 / h water consumption, the vortex well lift pump is crucial to the balance of turbid water. The advanced hot rolling production line uses a large submersible pump as a lift pump, which can greatly improve the stability of water delivery.

[0003] The working interface of large-scale lifting pumps used in vortex wells is generally 15 meters below the ground, and some production lines can reach 20 meters below the ground. Due to its use in deep water in vortex wells, submersible pumps are installed in a guided descent and automatic coupling manner. Large submersible pumps are equipped with an installation guide card 4. During installation, the submersible pump is suspended and the guide card is placed into the installation guide groove. It falls along the guide groove to its final installation position, and the water outlet 5 of the water pump can be docked with the water pipe port 8 of the water pipe 9 (installation docking surface 6). At the same time, the clamp 7 of the submersible pump is just stuck on the extension of the water pipe port 8 of the water pipe, so that the water outlet 5 of the water pump and the water pipe port 8 are in close contact to seal, ensuring that the water pumped by the submersible pump is discharged into the output pipe. Figure 1-Figure 3 shown.

[0004] However, since the submersible pump is in deep water and cannot be seen directly with the naked eye, and the influence of impurities such as iron oxide will lead to low installation accuracy, which will cause the water pump outlet 5 and the water pipe outlet 8 to not be completely tight at the joint, and there will be seepage and leakage to varying degrees. At the same time, since the vortex well is rich in a large amount of iron oxide, it will aggravate the wear of the sealing surface. In addition, due to the effects of pumping pressure, installation accuracy and other factors, long-term leakage will cause erosion and wear of the sealing end face 6 (the contact surface between the water pump outlet 5 and the water pipe outlet 8), and irregular grooves (such as Figure 4 In this case, the docking surface of the water pipe outlet 8 also has this problem, which will reduce the output efficiency of the submersible pump and greatly affect the pumping effect. In severe cases, it will affect the water balance of the turbid ring system, causing serious consequences such as overflow of the vortex well and shutdown of the production line.

[0005] When the above situation occurs, the pump needs to be repaired. Since the housing 1 and the water outlet 5 of the submersible pump are cast in one piece, the manufacturer generally needs to replace the pump housing 1. However, due to the high price of the housing, the maintenance cost is high. At the same time, since it needs to be returned to the factory for repair, the transportation time greatly increases the time to eliminate equipment defects. In addition, the water pipe 9 and the water pipe outlet 8 are welded in one piece, and the replacement of the pump housing is difficult and expensive.

[0006] It is found that there are invention patents that solve the corrosion of the water pump outlet flange caused by seawater corrosion, but this type of invention patent mainly solves the erosion surface caused by corrosion, and cannot solve the irregular scouring damage caused by the scouring of iron oxide scale in the vortex well, and the invention ideas and solutions of the present invention patent are different. For example, "Repairing method of corroded flange ring of circulating water pump body outlet pipe", patent number 201510275050, the present invention relates to the field of circulating water pumps in power plants, and in particular to a method for repairing the flange of a water pump body. A method for repairing a corroded flange ring of a circulating water pump body outlet pipe, the flange ring to be repaired is divided into several repair areas, there are at least two repair areas, each repair area covers at least two continuous flange bolt mounting holes, and a pressure plate is provided for each repair area; then each repair area is polished separately, and after polishing and leveling, a pressure plate is placed on it and the flange bolts are re-tightened to complete the repair work. The present invention divides the flange ring into a plurality of flattened areas, each area includes at least two adjacent flange bolt mounting holes, and a pressure plate is placed on the flattened area, thereby solving the problem of bolt loosening due to corrosion and simplifying the requirements for the flattening process; after the water pump is repaired, the turbine generator set is prevented from operating at reduced load due to a failure or damage of the circulating water pump, thereby ensuring safe and stable operation of the turbine generator set.

[0007] Therefore, the existing treatment methods have the problems of low treatment efficiency, great construction difficulty, high treatment cost, etc. In order to solve the above problems, it is necessary to provide a new method that can achieve efficient and rapid treatment of the scouring damaged parts of the sealing surface of the pump inlet of a large submersible pump. Summary of the invention

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a structure and method for repairing the sealing end face of the water outlet of a large submersible pump for a steel rolling vortex well, so as to repair the problem that the sealing end face of the water pump outlet is not able to seal water due to the erosion of water and slag. The working environment of submersible pumps such as steel mill vortex wells is harsh. Due to the low installation precision and the erosion after a certain period of use, the sealing end face of the water pump outlet will have problems such as pitting and notches, which will then cause water leakage, resulting in reduced pumping efficiency of the submersible pump. In severe cases, the water pump housing needs to be replaced, but the cost of replacing the water pump housing is high, which increases the operating cost of the equipment. The present technical invention is to study the use of simple, practical and low-cost metal repair agent bonding repair technology to replace the replacement of the pump housing and the water pipe end face repair and maintenance technical solutions.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a large-scale submersible pump outlet sealing end face repair structure for a steel rolling vortex well, comprising a water pump outlet and a circular pressure plate, the outlet sealing end face of the water pump outlet is cleaned and coated with a metal repair agent, three positioning nuts are evenly arranged along the circumferential direction on the outside of the water pump outlet, three leveling screws are arranged at positions corresponding to the positioning nuts as connecting parts for adjusting the circular pressure plate, the circular pressure plate adopts a flat plate with a circular structure, three ear holes are arranged on the circular pressure plate according to the distribution positions of the positioning nuts, the circular pressure plate is adapted to the leveling screw to pass through the parallel thread connection and the leveling nut, the leveling nut is locked by the leveling screw to make the circular pressure plate tightly fit with the outlet sealing end face, the circular pressure plate and the leveling nut press out the outlet sealing end face of the metal repair agent filled part, and the outlet sealing end face is kept in the same horizontality as the repair surface.

[0010] Specifically, three positioning nuts are provided, and the positioning nuts are located in the tangent direction of the sealing end surface of the water outlet, and an angle of 120° is formed between two positioning nuts.

[0011] Specifically, three leveling screws are provided, and the leveling screws cooperate with the positioning nuts and the leveling nuts.

[0012] Specifically, the size of the circular pressing plate is consistent with the sealing end surface of the water outlet, and the ear hole of the circular pressing plate coincides with the positioning nut.

[0013] Specifically, the plane to which the unwashed portion of the water outlet sealing end surface belongs is the wash end surface reference plane.

[0014] Specifically, a thin film is covered between the circular pressing plate and the metal repair agent, and the metal repair agent can be separated from the circular pressing plate after solidification.

[0015] A method for repairing a sealing end face repair structure of a large submersible pump outlet for a steel rolling vortex well comprises the following steps:

[0016] S01: According to the size of the water pump outlet, a circular pressure plate with a circular structure and good surface finish is processed;

[0017] S02: The faulty submersible pump is disassembled and hoisted out, and the water outlet of the pump and the sealing end surface of the water outlet are preliminarily cleaned;

[0018] S03: Weld three positioning nuts on the sealing end surface of the water outlet;

[0019] S04: Use a polishing machine to polish and remove rust from the eroded area until the original color of the metal is visible; clean and remove rust from the uneroded area, and use the eroded area as the reference surface of the repaired eroded end surface;

[0020] S05: After the rust removal is completed, the sealing end surface of the water outlet is cleaned;

[0021] S06: Apply the metal repair agent to the sealing end face of the water pump outlet that needs to be repaired. The height of the applied surface should be slightly higher than the scouring end face reference surface of the water pump outlet sealing end face;

[0022] S07: Pass the leveling screw through the fixing nut and the ear hole of the circular pressure plate, then screw on the leveling nut. Tighten the three leveling nuts evenly until the circular pressure plate is in close contact with the reference surface of the water pump outlet. Measure to ensure that the circular pressure plate and the reference surface maintain the same flatness.

[0023] S08: After the metal repair agent is statically cured and reaches the maximum curing strength, the leveling nut, leveling screw, circular pressure plate, and positioning nut are removed in sequence, and the repair surface is processed to complete the repair.

[0024] The present invention has the following beneficial effects:

[0025] The structure and method for repairing the sealing end face of the water outlet of a large submersible pump for a steel rolling vortex well designed by the present invention adopt a low-cost metal repair agent bonding repair technology to replace the repair technology scheme of replacing the pump casing and the water pipe end face, including the use of a positioning nut, a leveling screw, a circular pressure plate, and a leveling nut to coordinate and adjust the metal repair agent filled repair part, thereby achieving the size and accuracy of the repaired end face of the water pump outlet end face to be consistent with the original water pump.

[0026] The structure and method for repairing the sealing end face of the water outlet of a large submersible pump for a steel rolling vortex well designed in the present invention use simple and easy-to-prepare parts and methods, ensure the accuracy of the end face after repair, realize on-site repair, eliminate the need to return to the factory for repair, improve maintenance efficiency, and greatly reduce repair costs and construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a submersible pump.

[0028] Figure 2It is a side view of a submersible pump.

[0029] Figure 3 It is a schematic diagram of the structure after the submersible pump is installed.

[0030] Figure 4 This is a schematic diagram of the erosion of the sealing end face of the water pump outlet.

[0031] Figure 5 It is a structural schematic diagram of the repair structure of the present invention.

[0032] Figure 6 It is a side view of the repair structure of the present invention.

[0033] Figure 7 It is a structural schematic diagram of the circular pressing plate in the present invention.

[0034] Figure 8 It is a side view of the circular pressing plate in the present invention.

[0035] In the figure: 1-submersible pump housing, 2-fastening bolts, 3-submersible pump motor, 4-guide card, 5-water pump outlet, 6-water outlet sealing end face, 7-clamp, 8-water pipe outlet, 9-water pipe, 11-leveling screw, 12-leveling nut, 13-positioning nut, 14-circular pressure plate, 15-leveling measurement point, 16-metal repair agent. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] like Figure 5-Figure 8 As shown, a method for repairing the outlet end face of a large submersible pump for a steel rolling vortex well mainly includes: a leveling screw 11, a leveling nut 12, a fixing nut 13, a circular pressure plate 14, a leveling measuring point 15, a metal repair agent 16, etc. In addition, an electric welder, an electric grinder, a flat sandpaper polishing sheet, a grinding wheel, a wrench, a white cloth and other tools are provided. The specific repair steps are as follows:

[0038] S01: First, according to the size of the water outlet 5 of the submersible pump, a circular pressing plate 14 (such as Figure 7-Figure 8 As shown), ensure that the shape of the circular pressure plate 14 is consistent with the sealing end face 6 of the water pump outlet, and stick a layer of plastic film on one side of the circular pressure plate 14. The circular pressure plate 14 is leveled to ensure the smoothness and flatness of the repaired surface of the sealing end face 6 of the water pump outlet.

[0039] S02: The faulty submersible pump is disassembled and hoisted out, and the oxidized iron scale, dust, water stains, etc. on the surface of the water outlet 5 of the pump are cleaned.

[0040] S03: On the side of the water pump outlet 5, determine three positioning points along the circumferential section direction, and ensure that the three positioning points are evenly distributed, with an angle of 120° between each other. Weld three positioning nuts 13 at the three-divided positioning point positions, and use a steel ruler to measure and locate the end faces of the positioning nuts 13 and the end faces of the water pump outlet 5 to ensure that the two end faces are flush. After positioning, weld and fix. The external dimensions of the selected positioning nuts 13 after being fixedly connected to the water pump outlet 5 should be basically consistent with the external dimensions of the circular pressure plate 14.

[0041] S04: Use a polishing machine to polish, remove rust and clean the sealing end face and circumferential surface of the water pump outlet 5. The uneroded parts only need to be lightly polished and rusted, and used as the reference surface for repair (use an outside micrometer to measure the thickness of the water pump outlet end face and the circular pressure plate, and this thickness and value are the leveling reference values). For the severely eroded parts, first use a polishing sheet to thoroughly remove rust, and then use a grinding wheel to perform irregular grinding to improve the roughness of the repair surface.

[0042] S05: After polishing, rust removal and cleaning are completed, blow away the dust, wipe with acetone or diesel and other cleaning agents, and dry to ensure that the treated end face is clean.

[0043] S06: After the metal repair agent 16 is mixed evenly according to the instructions for use, it is quickly applied to the surface of the treated water pump outlet sealing end face 6 that needs to be repaired. When applying, apply force evenly and press repeatedly to ensure that the material is in full contact with the substrate surface to achieve the best effect. Multiple layers can be applied to areas with severe erosion, and the coating surface should be slightly higher than the reference surface of the water pump outlet sealing end face 6.

[0044] S07: After the metal repair agent is applied, place the side of the circular pressure plate 14 with the plastic film close to the repair coating surface, pass the leveling screw 11 through the holes on the positioning nut 13 and the circular pressure plate 14, and then screw on the leveling nut 12. Tighten the three leveling nuts 12 evenly until the circular pressure plate 14 is in close contact with the reference surface of the water pump outlet 5 (this part should be the uneroded position). During this period, use an outside micrometer to measure the three leveling measurement points 15 respectively, and finally ensure that the values ​​of the three leveling measurement points 15 are the same, and remove the excess metal repair agent 16 squeezed out around the water pump outlet 5.

[0045] S08: According to the instructions for use of the metal repair agent 16, static curing for a certain period of time is required. After the metal repair agent 16 reaches its maximum curing strength, the leveling screw 11, the leveling nut 12, the circular pressure plate 14, and the positioning nut 13 are disassembled in sequence, and the repair surface is checked. The high points are removed with a grinder and a flat sandpaper polishing sheet, and the circumference of the repair surface is chamfered to complete the repair.

[0046] In addition, the end face erosion problem existing in the water delivery pipe opening 8 can be repaired by the same method.

[0047] The present invention adopts the low-cost metal repair agent 16 to repair the water pump outlet sealed end face repair method mentioned above, and solves the problem of erosion damage to the seal end face of the large submersible pump outlet used in steel rolling vortex well.

[0048] The present invention uses simple and easy-to-prepare parts and methods, ensures the accuracy of the end face after repair, realizes on-site repair, does not need to return to the factory for repair, improves repair efficiency, and greatly reduces repair costs and construction difficulty.

[0049] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

[0050] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A large submersible pump outlet sealing end face repair structure for steel rolling vortex well, characterized in that: It includes a water pump outlet and a circular pressure plate, the water outlet sealing end face of the water pump outlet is cleaned and coated with metal repair agent, three positioning nuts are evenly arranged along the circumferential direction on the outside of the water pump outlet, three leveling screws are arranged at corresponding positions of the positioning nuts as connecting parts for adjusting the circular pressure plate, the circular pressure plate adopts a flat plate with a circular structure, three ear holes are arranged on the circular pressure plate according to the distribution positions of the positioning nuts, the circular pressure plate is adapted to the leveling screw to pass through the parallel thread connection and the leveling nut, the leveling nut is locked by the leveling screw to make the circular pressure plate fit tightly with the water outlet sealing end face, the circular pressure plate and the leveling nut press out the water outlet sealing end face at the part filled with the metal repair agent, and the water outlet sealing end face is kept in the same level as the repair surface.

2. The large submersible pump outlet sealing end face repair structure for steel rolling vortex well according to claim 1 is characterized in that: There are three positioning nuts, which are located in the tangent direction of the sealing end surface of the water outlet, and the positioning nuts form an angle of 120° between each other.

3. The large submersible pump outlet sealing end face repair structure for steel rolling vortex well according to claim 1 is characterized in that: The leveling screws are provided with three, and the leveling screws cooperate with the positioning nuts and the leveling nuts.

4. The large submersible pump outlet sealing end face repair structure for steel rolling vortex well according to claim 1 is characterized in that: The size of the circular pressing plate is consistent with the sealing end surface of the water outlet, and the ear hole of the circular pressing plate coincides with the positioning nut.

5. The large submersible pump outlet sealing end face repair structure for steel rolling vortex well according to claim 1 is characterized in that: The plane to which the unwashed portion of the outlet sealing end face belongs is the wash end face reference plane.

6. The large submersible pump outlet sealing end face repair structure for steel rolling vortex well according to claim 1 is characterized in that: A thin film is covered between the circular pressing plate and the metal repair agent, and the metal repair agent can be separated from the circular pressing plate after solidification.

7. The method for repairing the sealing end face repair structure of the water outlet of a large submersible pump for a steel rolling swirl well according to any one of claims 1 to 6, characterized in that: The following steps are involved: S01: According to the size of the water pump outlet, process a circular structure pressing plate with good surface finish; S02: The faulty submersible pump is disassembled and hoisted out, and the water outlet of the pump and the sealing end surface of the water outlet are preliminarily cleaned; S03: Weld three positioning nuts on the sealing end surface of the water outlet; S04: Use a polishing machine to polish and remove rust from the eroded area until the original color of the metal is visible; clean and remove rust from the uneroded area, and use the eroded area as the reference surface of the repaired eroded end surface; S05: After the rust removal is completed, the sealing end surface of the water outlet is cleaned; S06: Apply the metal repair agent to the sealing end face of the water pump outlet that needs to be repaired. The height of the applied surface should be slightly higher than the scouring end face reference surface of the water pump outlet sealing end face; S07: Pass the leveling screw through the fixing nut and the ear hole of the circular pressure plate, then screw on the leveling nut. Tighten the three leveling nuts evenly until the circular pressure plate is in close contact with the reference surface of the water pump outlet. Measure to ensure that the circular pressure plate and the reference surface maintain the same flatness. S08: After the metal repair agent is statically cured and reaches the maximum curing strength, the leveling nut, leveling screw, circular pressure plate, and positioning nut are removed in sequence, and the repair surface is processed to complete the repair.

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