Diffuser fixing clamp for repairing hydraulic component of main pump of nuclear power station

Abstract

The utility model provides a diffuser fixing clamp for repairing a hydraulic component of a main pump of a nuclear power station, and belongs to the technical field of diffuser repairing. The diffuser fixing clamp comprises a supporting structure and a fixing structure. The supporting structure is installed on the workbench, a positioning face is formed on the side, back on to the workbench, of the supporting structure, and the positioning face is used for supporting the diffuser on the workbench. The fixing structure comprises a plurality of first fixing assemblies and a plurality of second fixing assemblies, the first fixing assemblies can apply radial force to the peripheral face of the cylinder part when the guide vane part abuts against the positioning face, and the second fixing assemblies can apply axial pressure in the direction of the workbench to the flange part when the flange part abuts against the positioning face. The diffuser can be clamped and fixed in the mode that the guide vane part faces the workbench or the flange part faces the workbench, the positioning precision and the clamping strength of the diffuser on the workbench are improved, and the position stability and the repairing precision of the diffuser in the cutting and repairing process are guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of diffuser repair, and more specifically, relates to a diffuser fixing clamp for repairing hydraulic components of main pumps in nuclear power plants. Background Technology

[0002] Various types of pumps operate in all systems of a nuclear power plant. Among them, in the primary loop system of the nuclear island, the pump used to drive the coolant to circulate within the reactor coolant system is called the main pump of the nuclear island. The main pump is located in the heart of the nuclear island and continuously transfers the heat generated in the reactor core to the steam generator to convert it into thermal energy. It is the key to controlling the water circulation in nuclear power plant operations and belongs to the first-level equipment of the nuclear power plant.

[0003] After a long period of operation, the fitting dimensions of the hydraulic components inside the main pump of a nuclear power plant may be slightly deformed due to the operating conditions. It is necessary to disassemble the main pump regularly and inspect and maintain its components to eliminate potential safety hazards in subsequent operation.

[0004] The diffuser is one of the hydraulic components in the main pump of a nuclear power plant. It is used to cooperate with other components in the main pump, such as the heat shield, pump casing, suction guide sleeve, impeller, and labyrinth seal. The diffuser consists of a flange, a cylindrical body, and a guide vane. The flange, cylindrical body, and guide vane all have many mating surfaces. These mating surfaces will deform during use, requiring repair of multiple mating surfaces on the diffuser.

[0005] However, due to the complex structure and shape of the diffuser, it is difficult to clamp and fix the diffuser, and the clamping accuracy and stability of the diffuser cannot be guaranteed during the repair process. Utility Model Content

[0006] The purpose of this application is to provide a diffuser fixing fixture for repairing hydraulic components of the main pump of a nuclear power plant, so as to solve the problem that the diffuser has a complex shape and is difficult to clamp and fix.

[0007] To achieve the above objectives, this application provides a main pump diffuser fixing fixture for nuclear power plants, used for mounting on a workbench of a diffuser processing equipment. The diffuser includes a cylindrical body and flanges and guide vanes respectively disposed at both ends of the cylindrical body. The diffuser fixing fixture includes a support structure and a fixing structure. The support structure is mounted on the workbench, and a positioning surface is formed on the side of the support structure facing away from the workbench. The positioning surface is used to support the diffuser on the workbench. The fixing structure includes a plurality of first fixing components and / or a plurality of second fixing components. The plurality of first fixing components are mounted on the workbench and surround the periphery of the diffuser. The first fixing components can apply a radial force to the outer peripheral surface of the cylindrical body when the guide vanes abut against the positioning surface. The plurality of second fixing components are mounted on the workbench and surround the periphery of the diffuser. The second fixing components can apply an axial pressure toward the workbench when the flanges abut against the positioning surface.

[0008] In some embodiments, the first fixing component includes a base and a fixing claw. The base is mounted on the worktable, and the fixing claw is slidably disposed on the side of the base facing away from the worktable along a first direction, which is parallel to the radial direction of the diffuser.

[0009] In some embodiments, the first fixing component further includes a claw seat, a drive screw, and a nut seat. The claw seat is connected to the side of the base facing away from the worktable. The drive screw is arranged along the first direction and rotatably connected to the claw seat. The nut seat is slidably connected to the claw seat along the first direction and threadedly connected to the drive screw. The fixing claw is connected to the nut seat.

[0010] In some embodiments, the chuck seat is provided with a mounting groove, the mounting groove is provided along the first direction, the drive screw is disposed in the mounting groove, and the chuck seat is slidably connected to the mounting groove and connected to the drive screw.

[0011] In some embodiments, the second fixing component includes a bottom pad, a pressure plate, and a pressure member. The bottom pad is connected to the worktable, the pressure plate abuts against the side of the bottom pad facing away from the worktable, and the pressure member is connected to the worktable and the pressure plate to apply pressure to the pressure plate in the direction of the worktable.

[0012] In some embodiments, the pressure component includes a pressure screw and a pressure nut. The pressure screw is arranged along a second direction, which is parallel to the axial direction of the diffuser. One end of the pressure screw is connected to the worktable. A through hole is provided on the pressure plate, and the pressure screw passes through the through hole. The pressure nut is threadedly connected to the pressure screw, and the pressure nut abuts against the side of the pressure plate facing away from the worktable.

[0013] In some embodiments, the second fixing component further includes an adjusting pad located between the bottom pad and the pressure plate. An adjusting screw is provided at one end of the adjusting pad facing the bottom pad, and the adjusting screw is threadedly connected to the bottom pad. The pressure plate abuts against the side of the adjusting pad facing away from the bottom pad.

[0014] In some embodiments, the support structure includes a plurality of support pads connected to the workbench, the plurality of support pads being arranged in a circular pattern, and the end faces of the plurality of support pads facing away from the workbench collectively forming the positioning surface.

[0015] In some embodiments, the diffuser fixing fixture further includes an adjustment component connected to the worktable for adjusting the distance between the diffuser and the worktable.

[0016] In some embodiments, the adjustment assembly includes a support base and an adjustment head, the support base being connected to the worktable, and the adjustment head being threadedly connected to the side of the support base facing away from the worktable.

[0017] The beneficial effects of the diffuser fixing fixture for repairing hydraulic components of main pumps in nuclear power plants provided in this application are as follows: By installing a support structure and a fixing structure on the workbench, when the diffuser is clamped with its guide vane facing the workbench, the end face of the guide vane abuts against the positioning surface of the support structure. Multiple first fixing components apply radial force to different positions of the cylinder section to fix the diffuser to the workbench by clamping the cylinder section, thus solving the problem of the complex shape of the guide vane section being difficult to clamp. When the diffuser is clamped with its flange facing downwards, the end face of the flange abuts against the positioning surface of the support structure. The periphery of the flange can be directly clamped using lathe jaws mounted on the workbench. Simultaneously, multiple second fixing components apply downward axial pressure to the upward-facing end face of the flange to further compress and fix the flange, improving the stability of the diffuser when clamped with the flange facing downwards, thereby solving the problem of the complex structure and difficulty in clamping the diffuser. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram of the diffuser structure in the background art of this application;

[0020] Figure 2 This is a schematic diagram of the worktable of the vertical lathe in the embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the structure in which the diffuser is clamped onto the worktable by the first fixing component in an embodiment of this application;

[0022] Figure 4 This is a cross-sectional view of the base of the first fixing component in an embodiment of this application;

[0023] Figure 5 This is a partial view of the jaw seat, nut seat, drive screw, and fixed jaw of the first fixing component in the embodiment of this application;

[0024] Figure 6 This is an exploded view of the jaw seat, nut seat, drive screw, and fixed jaw of the first fixing component in the embodiment of this application;

[0025] Figure 7 This is a side view of the claw seat, nut seat, and fixing claw of the first fixing component in the embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of the diffuser being clamped onto the worktable by lathe chuck in an embodiment of this application;

[0027] Figure 9 This is a partial view of the diffuser being clamped to the worktable via a second fixing component in an embodiment of this application.

[0028] The following are the labeling elements in the figure:

[0029] 10-Diffuser; 11-Flange; 12-Cylinder; 13-Guide vane; 20-Worktable; 21-T-slot; 22-Lathe chuck; 23-T-bolt; 24-T-nut; 30-First fixing assembly; 31-Base; 311-Base plate; 3111-Connecting hole; 312-Top plate; 3121-Connecting groove; 313-Firming rib; 32-Fixing chuck; 33-Chuck seat; 331-Mounting groove; 331a-First groove; 331b-Second groove; 332-Baffle ; 333-Mounting hole; 34-Drive screw; 341-Handle; 35-Nut seat; 35a-First seat; 35b-Second seat; 36-Connecting bolt; 40-Second fixing component; 41-Bottom pad; 411-Connecting screw; 42-Pressure plate; 43-Adjusting pad; 431-Adjusting screw; 44-Pressure component; 441-Pressure screw; 442-Pressure nut; 50-Support pad; 60-Adjusting component; 61-Support base; 62-Adjusting head; 621-Operating hole. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] like Figure 1As shown, the diffuser 10 includes a flange portion 11, a cylindrical portion 12, and a guide vane portion 13. The cylindrical portion 12 is hollow inside. The flange portion 11 and the guide vane portion 13 are respectively located at both ends of the cylindrical portion 12 along its axial direction. The flange portion 11, the cylindrical portion 12, and the guide vane portion 13 all have multiple mating surfaces for mates with other components in the main pump. After a period of use, the mating surfaces on the diffuser 10 will deform due to long-term stress, causing the dimensions of the mating surfaces to increase or decrease compared to the design dimensions. By measuring the dimensional deformation of each mating surface of the diffuser 10 and machining the mating surfaces, the dimensional accuracy of the mating surfaces can be restored, achieving the purpose of repairing the diffuser 10 and ensuring that the connection and fit between the diffuser 10 and other components in the main pump meet the design requirements.

[0035] The machining equipment used for cutting and repairing the diffuser 10 can be a vertical lathe, a milling machine, a grinding machine, or a multi-axis machining center. A vertical lathe includes a machine body, a worktable 20, a vertical tool post, and a side tool post. The worktable 20 is rotatably connected to the machine body via a spindle. Figure 2 As shown, the upper surface of the worktable 20 has multiple T-slots 21 and multiple lathe jaws 22. A vertical tool post is vertically positioned above the worktable 20, and a side tool post is horizontally positioned to one side of the worktable 20. Both the vertical and side tool posts are used to mount cutting tools for the workpiece. When repairing the diffuser 10, the diffuser 10 is mounted on the worktable 20 with its axis vertical. The worktable 20 rotates the diffuser 10, and the cutting tools on the vertical or side tool post are used to cut the mating surfaces of the diffuser 10 to restore its dimensional accuracy.

[0036] When repairing the diffuser 10, it can first be clamped onto the worktable 20 with the guide vane 13 facing the worktable 20, and the mating surface facing the flange 11 can be cut and repaired. Then, the diffuser 10 can be clamped onto the worktable 20 with the flange 11 facing the worktable 20, and the mating surface facing the guide vane 13 can be cut and repaired. When the guide vane 13 faces the worktable 20, due to the complex shape of the guide vane 13, it is not possible to directly use the lathe chuck 22 on the worktable 20 to clamp and fix the periphery of the guide vane 13. When the flange 11 faces the worktable 20, due to the large height and high center of gravity of the diffuser 10, directly using the lathe chuck 22 to clamp the periphery of the flange 11 cannot guarantee the stability of the diffuser 10. Therefore, both of the above clamping methods are difficult, and the worktable 20 of the vertical lathe is not suitable for the repair work of the diffuser 10.

[0037] This application provides a diffuser fixing fixture for repairing hydraulic components of a nuclear power plant main pump. It is mounted on the worktable 20 of a vertical lathe and clamps the diffuser 10 with its guide vane 13 or flange 11 facing the worktable 20. This improves the positioning accuracy and clamping strength of the diffuser 10 on the worktable 20, ensuring positional stability and repair accuracy during the cutting and repair process. Furthermore, the diffuser fixing fixture provided in this application can also be installed in machining equipment capable of machining and repairing the diffuser 10, such as milling machines, grinding machines, or multi-axis machining centers, and can also be applied to other machining processes of the diffuser 10.

[0038] like Figures 3-9 As shown, the diffuser fixing fixture provided in this application embodiment includes a support structure and a fixing structure. The support structure is installed on the worktable 20 and forms a positioning surface on the side facing away from the worktable 20. The positioning surface is used to support the diffuser 10 on the worktable 20. The fixing structure includes a plurality of first fixing components 30 and / or a plurality of second fixing components 40. The plurality of first fixing components 30 are installed on the worktable 20 and surround the periphery of the diffuser 10. The first fixing components 30 can apply a radial force to the outer peripheral surface of the cylinder portion 12 when the guide vane portion 13 abuts against the positioning surface. The plurality of second fixing components 40 are installed on the worktable 20 and surround the periphery of the diffuser 10. The second fixing components 40 can apply an axial pressure toward the worktable 20 to the flange portion 11 when the flange portion 11 abuts against the positioning surface.

[0039] The worktable 20 of the vertical lathe is arranged horizontally, and both the support structure and the fixing structure are installed on the upper surface of the worktable 20. The support structure forms a positioning surface on the side facing away from the worktable 20. The positioning surface is horizontal, so that one end face of the diffuser 10 in the axial direction can abut against the positioning surface, thereby improving the positioning accuracy of the axial end face of the diffuser 10.

[0040] like Figures 3-7 As shown, when the diffuser 10 is clamped with the guide vane 13 facing the worktable 20, the end face of the guide vane 13 abuts against the positioning surface of the support structure. The guide vane 13 has a complex shape, and its periphery cannot withstand large radial forces. In this case, multiple first fixing components 30 can be used to apply radial forces to different positions of the cylinder 12 to fix the diffuser 10 to the worktable 20 by clamping the cylinder 12. This solves the problem of the guide vane 13 not being clamped, allowing the diffuser 10 to be stably clamped to the worktable 20 with the guide vane 13 facing downwards.

[0041] like Figure 8 and Figure 9As shown, when the diffuser 10 is clamped with the flange 11 facing downwards, the end face of the flange 11 abuts against the positioning surface of the support structure. The periphery of the flange 11 can be directly clamped by the lathe jaws 22 provided on the worktable 20. At the same time, multiple second fixing components 40 surround the periphery of the flange 11 and apply downward axial pressure to the upward-facing end face of the flange 11 to further press and fix the flange 11, thereby improving the stability of the diffuser 10 when clamped with the flange 11 facing downwards.

[0042] like Figures 3-7 As shown, in some embodiments, the first fixing component 30 may include a base 31 and a fixing claw 32. The base 31 is mounted on the worktable 20, and the fixing claw 32 is slidably disposed on the side of the base 31 facing away from the worktable 20 along a first direction, which is parallel to the radial direction of the diffuser 10.

[0043] The base 31 can be vertically mounted on the worktable 20. The bottom of the base 31 is connected to the worktable 20, and the top is used to mount the fixing claws 32. The height of the base 31 can be adapted to the height of the cylinder 12 when the diffuser 10 is in the downward orientation of the guide vane 13, so that the height of the fixing claws 32 matches the height of the cylinder 12. The fixing claws 32 can slide radially on the base 31 along the diffuser 10, so that they can abut against the outer circumferential surface of the cylinder 12 and apply radial force to the diffuser 10. Thus, under the action of the multiple fixing claws 32, the diffuser 10 is clamped on the worktable 20.

[0044] The shape of the base 31 can be arbitrary, for example... Figure 4 As shown, the base 31 may include a base plate 311, a top plate 312, and multiple stiffening plates 313. The base plate 311 and top plate 312 are both horizontally arranged, and the multiple stiffening plates 313 are spaced apart between the base plate 311 and top plate 312. The stiffening plates 313 may be vertically or inclined, and their upper and lower ends are connected to the base plate 311 and top plate 312 respectively to form a structurally stable base 31. The base plate 311 may be provided with connecting holes 3111 to allow T-bolts 23 to be used to fix the base plate 311 to the T-slot 21 of the worktable 20. The shape of the fixing claw 32 can also be arbitrary. The fixing claw 32 can be connected to the top plate 312 via a slide rail structure. The end of the fixing claw 32 facing the diffuser 10 may be provided with a mating structure that mates with the outer circumferential surface of the cylinder part 12, such as a V-groove or an arc-shaped groove, to better apply radial force to the cylinder part 12.

[0045] like Figure 5 and Figure 6As shown, the first fixing component 30 further includes a claw seat 33, a drive screw 34, and a nut seat 35. The claw seat 33 is connected to the side of the base 31 facing away from the worktable 20. The drive screw 34 is arranged along the first direction and is rotatably connected to the claw seat 33. The nut seat 35 is slidably connected to the claw seat 33 along the first direction, and the nut seat 35 is threadedly connected to the drive screw 34.

[0046] The claw seat 33 can be a rectangular block structure, and it is arranged radially on the top plate 312 along the diffuser 10. The claw seat 33 supports the drive screw 34, the nut seat 35, and the fixed claw 32, enabling the fixed claw 32 to slide in the first direction. The claw seat 33 and the base 31 can be connected by fasteners. For example, two connecting slots 3121 are provided on the top plate 312. The cross-sectional shape of the connecting slots 3121 can be T-shaped. The claw seat 33 is provided with multiple mounting holes 333 at the positions corresponding to the two connecting slots 3121, so that the claw seat 33 can be fixed to the top plate 312 using connecting bolts 36.

[0047] The drive screw 34 is a rod-shaped component with a thread of a certain length on its outer surface. A bearing seat can be provided on the chuck seat 33. The drive screw 34 is rotatably connected to the chuck seat 33 via the bearing, allowing the drive screw 34 to rotate around its own axis. A handle 341 can also be provided at one end of the drive screw 34 to control its rotation. The nut seat 35 is slidably fitted with the chuck seat 33, and a threaded hole is provided on the nut seat 35 to mate with the drive screw 34. The drive screw 34 passes through the threaded hole to achieve a threaded engagement with the nut seat 35. When the drive screw 34 rotates, the nut seat 35 can slide along the axial direction of the drive screw 34.

[0048] The fixed claw 32 can be fixed to the top of the nut seat 35 by fasteners, so that the fixed claw 32 can be driven to slide by the rotation of the drive screw 34. Furthermore, the threaded connection between the drive screw 34 and the nut seat 35 has a self-locking characteristic, which ensures the position of the fixed claw 32 is stable and improves the clamping stability of the fixed claw 32 on the diffuser 10.

[0049] Furthermore, the pawl seat 33 may be provided with a mounting groove 331, the mounting groove 331 is provided along the first direction, the drive screw 34 is provided in the mounting groove 331, and the pawl seat 33 is slidably connected in the mounting groove 331 and connected to the drive screw 34.

[0050] The mounting groove 331 is a accommodating structure with a certain space. The mounting groove 331 is arranged through the length of the claw seat 33, and has openings at both the top and side of the claw seat 33. The nut seat 35 slides into the mounting groove 331 through the side opening, and can connect to the fixed claw 32 through the top opening of the mounting groove 331. A baffle 332 can be installed at the opening on the extended side of the claw seat 33 of the mounting groove 331 to close the side opening of the mounting groove 331, thus protecting and limiting the movement of the components within the mounting groove 331.

[0051] The cross-sectional shape of the mounting groove 331 is the same as that of the claw seat 33, so as to limit the position of the nut seat 35. For example, Figure 7 As shown, the mounting groove 331 may include a first groove 331a and a second groove 331b. The first groove 331a is disposed on the top surface of the claw seat 33, and there are two second grooves 331b, which are respectively disposed on the two vertical inner walls of the first groove 331a. The nut seat 35 includes a first seat 35a and a second seat 35b. The first seat 35a is a rectangular block, and there are two second seats 35b, which are respectively disposed on the two opposite vertical side walls of the first seat 35a. The cross-sectional shape of the first seat 35a is the same as the cross-sectional shape of the first groove 331a, and the cross-sectional shape of the second seat 35b is the same as the cross-sectional shape of the second groove 331b.

[0052] When the nut seat 35 is inserted into the mounting groove 331, the first seat 35a is embedded in the first groove 331a, and the second seat 35b is embedded in the corresponding second groove 331b, allowing the nut seat 35 to slide within the mounting groove 331. The cooperation of the second seat 35b and the second groove 331b limits the position of the first seat 35a, preventing the nut seat 35 from dislodging from the upper opening of the first groove 331a. The top of the first seat 35a can protrude from the top opening of the first groove 331a, and the fixing claw 32 can be connected to the top of the first seat 35a.

[0053] like Figure 8 and Figure 9 As shown, in some embodiments, the second fixing component 40 may include a bottom pad 41, a pressure plate 42, and a pressure member 44. The bottom pad 41 is connected to the worktable 20, the pressure plate 42 abuts against the side of the bottom pad 41 facing away from the worktable 20, and the pressure member 44 is connected to the worktable 20 and to the pressure plate 42 for applying pressure to the pressure plate 42 in the direction toward the worktable 20.

[0054] The bottom pad 41 can be a circular or other shaped block structure. The bottom surface of the bottom pad 41 is provided with a threaded hole. When the bottom pad 41 is installed on the worktable 20, the connecting screw 411 is screwed into the threaded hole at the bottom of the bottom pad 41, and the T-nut 24 is installed in the T-slot 21. The bottom of the connecting screw 411 is screwed into the T-nut 24, so that the bottom surface of the bottom pad 41 fits against the upper surface of the worktable 20, and the bottom pad 41 is fixed on the worktable 20.

[0055] The pressure plate 42 is a flat plate structure of a certain length, which is greater than the width of the bottom pad 41, allowing the pressure plate 42 to extend to the upper side of the flange 11 on the side facing the diffuser 10. The height of the bottom pad 41 can be adapted to the height of the upper end face of the flange 11, so that the pressure plate 42 can be pressed onto the upper end face of the flange 11. The pressure member 44 applies downward pressure to the pressure plate 42, thereby applying downward axial pressure to the flange 11 through the pressure plate 42. Under the action of multiple second fixing components 40, the flange 11 is pressed tightly onto the worktable 20.

[0056] In addition, while applying axial pressure to the flange 11 using multiple second fixing components 40, multiple lathe jaws 22 provided on the worktable 20 can be used to clamp the outer circular surface of the flange 11, thereby ensuring the stability and positioning accuracy of the diffuser 10 clamped on the worktable 20 with the flange 11 facing downward.

[0057] Furthermore, the pressure component 44 may include a pressure screw 441 and a pressure nut 442. The pressure screw 441 is arranged along a second direction, which is parallel to the axial direction of the diffuser 10. One end of the pressure screw 441 is connected to the worktable 20. The pressure plate 42 is provided with a through hole 421, and the pressure screw 441 passes through the through hole. The pressure nut 442 is threadedly connected to the pressure screw 441, and the pressure nut 442 abuts against the side of the pressure plate 42 facing away from the worktable 20.

[0058] like Figure 9 As shown, the pressure screw 441 is a vertically arranged rod-shaped component with a threaded structure on its outer surface. The bottom of the pressure screw 441 can be fixed in the T-slot 21 of the worktable 20 by a T-nut 24. A through hole 421 is provided at the position corresponding to the pressure screw 441 on the pressure plate 42. The diameter of the through hole 421 can be larger than the diameter of the pressure screw 441, so that the pressure screw 441 can pass through the through hole 421. The pressure nut 442 is located above the pressure plate 42 and is threaded to the pressure screw 441. By rotating the pressure nut 442, pressure is applied to the pressure plate 42 towards the worktable 20, thereby applying downward axial pressure to the flange 11 through the pressure plate 42.

[0059] The pressure screw 441 can be disposed between the bottom pad 41 and the diffuser 10, close to the part where the pressure plate 42 contacts the flange 11, so as to better apply downward pressure to the flange 11 through the pressure plate 42.

[0060] Furthermore, the second fixing component 40 also includes an adjusting pad 43, which is located between the bottom pad 41 and the pressure plate 42. An adjusting screw 431 is provided at one end of the adjusting pad 43 facing the bottom pad 41. The adjusting screw 431 is threadedly connected to the bottom pad 41. The pressure plate 42 abuts against the side of the adjusting pad 43 facing away from the bottom pad 41.

[0061] It is understandable that there may be installation errors when the bottom pad 41 is installed on the workbench 20, making it impossible to ensure that the top of the bottom pad 41 is completely flush with the upward-facing end face of the flange 11. This would prevent the pressure plate 42 from accurately applying pressure to the flange 11. By setting an adjusting pad 43 on the top of the bottom pad 41, after the pressure plate 42 is placed, the adjusting pad 43 can be rotated according to the levelness of the pressure plate 42 to change the top height of the adjusting pad 43. The top height of the adjusting pad 43 can be adjusted to be flush with the upper end face of the flange 11, thereby ensuring that the pressure plate 42 is horizontally arranged and accurately applies pressure to the flange 11.

[0062] Specifically, the adjusting pad 43 is a circular or other shaped block structure. When the adjusting pad 43 is a circular block, the adjusting screw 431 can be coaxially set with the adjusting pad 43. The top of the bottom pad 41 is also provided with a threaded hole, so that the adjusting screw 431 can be screwed into the threaded hole. By rotating the adjusting pad 43, the top height of the adjusting pad 43 can be changed.

[0063] like Figure 3 , Figure 8 and Figure 9 As shown, in some embodiments, the support structure includes a plurality of support pads 50 connected to the worktable 20. The plurality of support pads 50 are arranged in a circular pattern, and the end faces of the plurality of support pads 50 facing away from the worktable 20 together constitute a positioning surface.

[0064] The support pad 50 can be a circular block or other shaped block structure. The bottom of the support pad 50 can be fixed to the T-slot 21 on the worktable 20 by T-bolts 23. The top of the support pad 50 is flat, and the tops of multiple support pads 50 are flush to form a positioning surface. The circular distribution radius of the multiple support pads 50 should match the radius of the end faces on both sides of the diffuser 10, so that the end face of the flange 11 or the end face of the guide vane 13 can abut against the top of the multiple support pads 50.

[0065] Compared to directly using the surface of the worktable 20 to abut against the axial end face of the diffuser 10, the contact area between the positioning surface and the diffuser 10 is reduced, resulting in a smaller positioning error. Furthermore, after all the support pads 50 are installed, the top of the support pads 50 can be cut using a cutting tool on a vertical lathe, thereby ensuring that the top of each support pad 50 is flush, eliminating installation errors caused by the support pads 50 during installation, and resulting in a more accurate positioning surface, further improving the positioning accuracy of the diffuser 10.

[0066] like Figure 8 and Figure 9 As shown, in some embodiments, the diffuser fixing fixture further includes an adjustment component 60, which is connected to the worktable 20 and is used to adjust the distance between the diffuser 10 and the worktable 20.

[0067] After the diffuser 10 is clamped onto the worktable 20 using the support and fixing structures, the position of the diffuser 10 needs to be adjusted so that the horizontality of the upward-facing end face of the diffuser 10 meets the process requirements. When adjusting the position of the diffuser 10, one or more adjustment components 60 are installed in the gap between the downward-facing end face of the diffuser 10 and the worktable 20. By adjusting the components 60, the height of the corresponding position of the diffuser 10 is finely adjusted to achieve the purpose of finely adjusting the horizontality of the upward-facing end face of the diffuser 10.

[0068] Furthermore, the adjustment assembly 60 may include a support base 61 and an adjustment head 62, the support base 61 being connected to the worktable 20, and the adjustment head 62 being threadedly connected to the side of the support base 61 facing away from the worktable 20.

[0069] The support base 61 can be a cylindrical or conical column structure. Threaded holes can be provided at both the top and bottom of the support base 61. The threaded hole at the bottom of the support base 61 is used to connect a T-bolt 23, allowing the support base 61 to be fixed to the T-slot 21 of the worktable 20 via the T-bolt 23. The adjusting head 62 can also be a cylindrical or conical column structure. The portion of the adjusting head 62 facing the support base 61 can be provided with external threads to mate with the threaded hole at the top of the support base 61, achieving a threaded connection between the adjusting head 62 and the support base 61. The top of the adjusting head 62 can be conical to reduce the contact area between the top of the adjusting head 62 and the bottom surface of the diffuser 10. The adjusting head 62 can also be provided with an operating hole 621, which can be hexagonal or circular in shape, to allow insertion of tools such as wrenches, facilitating the operator to drive the adjusting head 62 to rotate. Furthermore, the adjusting assembly 60 can also directly use devices such as jacks.

[0070] After placing the diffuser 10 on the positioning surface, install the support base 61 on the worktable 20, and rotate the adjusting head 62 so that the top of the adjusting head 62 abuts against the downward end face of the diffuser 10 and applies an upward thrust. After measuring the levelness of the upward end face of the diffuser 10, rotate the adjusting head 62 at the corresponding position to fine-tune the height of each position of the diffuser 10 so that the levelness of the upward end face of the diffuser 10 meets the process requirements.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A diffuser fixing jig for nuclear power plant main pump hydraulic component repair, for being installed on a worktable of a diffuser processing equipment, the diffuser comprising a barrel portion and a flange portion and a guide vane portion respectively arranged at both ends of the barrel portion; characterized in that, The diffuser fixing jig comprises a support structure and a fixing structure; the support structure is installed on the workbench, and a positioning surface is formed on the side of the support structure away from the workbench, which is used to support the diffuser on the workbench; the fixing structure comprises a plurality of first fixing components and / or a plurality of second fixing components; the plurality of first fixing components are installed on the workbench and surround the periphery of the diffuser, and the first fixing components can exert a radial force on the outer circumferential surface of the cylinder portion when the guide vane portion abuts against the positioning surface; the plurality of second fixing components are installed on the workbench and surround the periphery of the diffuser, and the second fixing components can exert an axial pressure on the flange portion towards the direction of the workbench when the flange portion abuts against the positioning surface.

2. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 1, characterized in that, The first fixing component comprises a base and a fixing claw; the base is installed on the workbench; the fixing claw is slidingly arranged on the side of the base away from the workbench along a first direction, which is parallel to the radial direction of the diffuser.

3. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 2, characterized in that, The first fixing component further comprises a claw base, a driving lead screw and a nut base; the claw base is connected to the side of the base away from the workbench; the driving lead screw is arranged along the first direction and rotationally connected to the claw base; the nut base is slidingly connected to the claw base along the first direction, and the nut base is threadedly connected to the driving lead screw; and the fixing claw is connected to the nut base.

4. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 3, characterized in that, The claw base is provided with a mounting groove arranged along the first direction; the driving lead screw is arranged in the mounting groove; and the claw base is slidingly connected in the mounting groove and connected to the driving lead screw.

5. The diffuser fixture for hydraulic component repair of a primary pump of a nuclear power plant according to claim 1, characterized in that, The second fixing component comprises a bottom pad, a pressing plate and a pressure component; the bottom pad is connected to the workbench; the pressing plate abuts against the side of the bottom pad away from the workbench; and the pressure component is connected to the workbench and connected to the pressing plate, and is used to exert a pressure on the pressing plate towards the direction of the workbench.

6. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 5, characterized in that, The pressure component comprises a pressure screw and a pressure nut; the pressure screw is arranged along a second direction, which is parallel to the axial direction of the diffuser; one end of the pressure screw is connected to the workbench; the pressing plate is provided with a through hole; the pressure screw is arranged in the through hole; and the pressure nut is threadedly connected to the pressure screw and abuts against the side of the pressing plate away from the workbench.

7. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 6, characterized in that, The second fixing component further comprises an adjusting pad between the bottom pad and the pressing plate; one end of the adjusting pad towards the bottom pad is provided with an adjusting screw; the adjusting screw is threadedly connected to the bottom pad; and the pressing plate abuts against the side of the adjusting pad away from the bottom pad.

8. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to any of claims 1-7, characterized in that, The support structure comprises a plurality of support pads connected to the workbench; the plurality of support pads are circularly arranged; and the end surfaces of the plurality of support pads away from the workbench jointly form the positioning surface.

9. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to any of claims 1-7, characterized in that, The diffuser fixing clamp further comprises an adjusting assembly connected to the workbench for adjusting the distance between the diffuser and the workbench.

10. The diffuser fixture for hydraulic components repair of main pumps of nuclear power plants according to claim 9, characterized in that, The adjusting assembly comprises a supporting seat connected to the workbench and an adjusting head threadedly connected to the side of the supporting seat away from the workbench.

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