Method for repairing diffuser of hydraulic component of main pump of nuclear power plant

Abstract

The invention provides a method for repairing a diffuser of a hydraulic component of a main pump of a nuclear power plant, and relates to the technical field of repairing of the hydraulic component of the main pump of the nuclear power plant. Dividing the plurality of matching surfaces of the diffuser into first matching surfaces and second matching surfaces; the diffuser is clamped on the workbench in the first direction; the first direction is that the guide vane part of the diffuser faces the workbench; obtaining a first deformation amount of the first matching surface, and cutting the first matching surface according to the first deformation amount; the diffuser is clamped on the workbench in the second direction; the second direction is that the flange part of the diffuser faces the workbench; and the second deformation amount of the second matching surface is obtained, and the second matching surface is cut according to the second deformation amount, so that the clamping frequency of the diffuser on the workbench can be reduced, generation and accumulation of positioning errors are reduced, and the repairing precision of the diffuser can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of repairing hydraulic components of a nuclear power plant main pump, and more specifically, to a method for repairing a diffuser of a hydraulic component of a nuclear power plant main pump. Background Art

[0002] There are various types of pumps in operation in each system 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 in the reactor coolant system is called the nuclear main pump. The main pump is located in the heart of the nuclear island and is used to drive the coolant to circulate in the reactor cooling system, continuously transferring the heat generated in the core to the steam generator for conversion into thermal energy. It is the key to controlling the water circulation in nuclear power operation and belongs to the primary equipment of the nuclear power plant.

[0003] After the main pump of a nuclear power plant has been running for a long time, the matching dimensions of the hydraulic components in the main pump will be slightly deformed due to the operating conditions. It is necessary to disassemble the main pump regularly, inspect and maintain the components of the main pump, and eliminate safety hazards in subsequent operation.

[0004] The diffuser is one of the hydraulic components in the main pump of a nuclear power plant. It consists of a flange, a barrel and a guide vane. It is used to cooperate with the heat shield, pump casing, suction guide sleeve, impeller, labyrinth seal and other components in the hydraulic components of the main pump. There are many mating surfaces on the flange, barrel and guide vane of the diffuser. These mating surfaces will be deformed during use, and multiple mating surfaces on the diffuser need to be repaired.

[0005] However, due to the complex structural shape of the diffuser, the different shapes and sizes of the mating surfaces and the messy distribution positions, the conventional repair method requires multiple clamping of the diffuser, resulting in reduced positioning accuracy and a large amount of error accumulation, making it difficult to ensure the repair accuracy. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a method for repairing a diffuser of a hydraulic component of a main pump of a nuclear power plant, so as to solve the problem in the prior art that the diffuser has a complex structure and it is difficult to ensure the repair accuracy.

[0007] To achieve the above-mentioned purpose, the present application provides a method for repairing a diffuser of a hydraulic component of a main pump of a nuclear power plant, wherein the diffuser comprises a flange portion, a barrel portion and a guide vane portion, and a processing device for repairing the diffuser comprises a workbench; the method for repairing the diffuser comprises:

[0008] The multiple mating surfaces of the diffuser are divided into a first mating surface and a second mating surface; the first mating surface includes a mating surface located on the flange portion and a mating surface located on the barrel portion facing and close to the flange portion; the second mating surface includes a mating surface located on the guide vane portion and a mating surface located on the barrel portion facing and close to the guide vane portion;

[0009] Clamp the diffuser on the workbench along a first direction; the first direction is the direction of the guide vane portion toward the workbench;

[0010] Acquiring a first deformation amount of the first mating surface, and cutting the first mating surface according to the first deformation amount;

[0011] Clamp the diffuser to the workbench along a second direction; the second direction is the direction of the flange portion toward the workbench;

[0012] A second deformation amount of the second mating surface is obtained, and the second mating surface is cut according to the second deformation amount.

[0013] In some embodiments, the workbench is equipped with a support pad; the step of clamping the diffuser to the workbench along the first direction includes:

[0014] Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape;

[0015] The guide vane portion is brought into contact with the end surface of the support block facing away from the workbench;

[0016] Install a first fixing assembly on the workbench, wherein the first fixing assembly is in plurality and is arranged around the diffuser;

[0017] The first fixing assembly is used to clamp the barrel portion, and the diffuser is clamped at a first clamping position.

[0018] In some embodiments, the method of clamping the barrel portion using the first fixing assembly to clamp the diffuser at a first clamping position includes:

[0019] enabling the first fixing assembly to clamp the barrel portion with a first pre-clamping force;

[0020] Measuring a first initial run-out value of the first mating surface, and adjusting the relative position of the diffuser and the workbench to minimize the first initial run-out value;

[0021] measuring a first remeasured run-out value of the first mating surface;

[0022] When the difference between the first initial measured runout value and the first re-measured runout value is within a first range threshold, it is determined that the diffuser is in the first clamping position, and the first fixing assembly clamps the cylinder portion with a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

[0023] In some embodiments, obtaining a first deformation amount of the first mating surface and cutting the first mating surface according to the first deformation amount includes:

[0024] According to the shape of the first mating surface, dividing the first mating surface into a first mating end surface and a first mating circumferential surface;

[0025] Measuring a deformation amount of a first end face, and cutting the first mating end face according to the deformation amount of the first end face, wherein the deformation amount of the first end face is a deformation amount corresponding to the first mating end face in the first deformation amount;

[0026] The deformation amount of the first circumferential surface is measured, and the first matching circumferential surface is cut according to the deformation amount of the first circumferential surface, wherein the deformation amount of the first circumferential surface is the deformation amount corresponding to the first matching circumferential surface in the first deformation amount.

[0027] In some embodiments, the number of the first mating end faces is multiple, the first end face deformation amount is correspondingly multiple, and the measuring the first end face deformation amount and cutting the first mating end face according to the first end face deformation amount includes:

[0028] Selecting at least one of the first mating end faces as a first reference face, determining the first end face deformation amount corresponding to the first reference face according to the first re-measured run-out value, and cutting the first reference face according to the first end face deformation amount corresponding to the first reference face;

[0029] The first reference surface after cutting is used as a reference to determine the deformation of the first end surface corresponding to the remaining first matching end surfaces, and then the remaining first matching end surfaces are cut.

[0030] In some embodiments, the workbench is provided with a lathe clamp and a support block; the step of clamping the diffuser to the workbench along the second direction comprises:

[0031] Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape;

[0032] The flange is brought into contact with the end surface of the support block facing away from the workbench;

[0033] The flange portion is clamped by using the lathe jaws to clamp the diffuser at a second clamping position.

[0034] In some embodiments, the step of clamping the flange portion using the lathe jaws to clamp the diffuser at a second clamping position includes:

[0035] causing the lathe jaws to clamp the flange portion with a second pre-clamping force;

[0036] Measuring a second initial run-out value of the second mating surface, and adjusting the relative position of the diffuser and the workbench to minimize the second initial run-out value;

[0037] measuring a second remeasured run-out value of the second mating surface;

[0038] When the difference between the second initial measured runout value and the second re-measured runout value is within a second range threshold, it is determined that the diffuser is in the second clamping position, and the second fixing assembly clamps the cylinder portion with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

[0039] In some embodiments, obtaining a second deformation amount of the second mating surface and cutting the second mating surface according to the second deformation amount includes:

[0040] According to the shape of the second mating surface, dividing the second mating surface into a second mating end surface and a second mating circumferential surface;

[0041] Measuring the deformation of the second end face, and cutting the second mating end face according to the deformation of the second end face, wherein the deformation of the second end face is the deformation of the second mating end face corresponding to the deformation of the second deformation;

[0042] The deformation amount of the second circumferential surface is measured, and the second mating circumferential surface is cut according to the deformation amount of the second circumferential surface, where the deformation amount of the second circumferential surface is the second deformation amount of the second mating circumferential surface.

[0043] In some embodiments, the number of the second mating end faces is multiple, the deformation amount of the second end faces is correspondingly multiple, and the measuring the deformation amount of the second end faces and cutting the second mating end faces according to the deformation amount of the second end faces include:

[0044] Selecting at least one of the second mating end faces as a second reference face, determining the deformation of the second end face corresponding to the second reference face according to the second re-measured run-out value, and cutting the second reference face according to the deformation of the second end face corresponding to the second reference face;

[0045] The second reference surface after cutting is used as a reference to determine the deformation of the second end corresponding to the remaining second matching end surfaces, and cut the remaining second matching end surfaces.

[0046] In some embodiments, the step of clamping the diffuser to the workbench along the second direction further comprises:

[0047] A second fixing component is installed on the workbench, and the second fixing component is used to apply an axial pressure toward the workbench to the flange portion; the number of the second fixing components is multiple and they are arranged around the periphery of the diffuser.

[0048] The beneficial effect of the diffuser repair method of the hydraulic component of the main pump of a nuclear power plant provided by the present application is that: according to the structural characteristics of the diffuser, its multiple mating surfaces are subdivided into flange mating surfaces, first cylinder mating surfaces, second cylinder mating surfaces and guide vane mating surfaces. By fixing the diffuser on the workbench in a manner such as the flange part facing or the guide vane part facing, the flange mating surface and the first cylinder mating surface can be measured and cut and repaired respectively. Similarly, the guide vane mating surface and the second cylinder mating surface are measured and repaired. This clamping method not only facilitates the positioning and fixing of the diffuser, but also improves the convenience of the repair work, reduces the difficulty of repair, and improves the quality of repair. By reducing the number of times the diffuser is clamped on the workbench and reducing the generation and accumulation of positioning errors, the accuracy of the mating surface repair can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 It is a structural schematic diagram of a diffuser in the background technology of this application;

[0051] Figure 2 A top view of a workbench of a vertical lathe in an embodiment of the present application;

[0052] Figure 3 This is a flow chart of the diffuser repair method in an embodiment of the present application;

[0053] Figure 4 This is a top view of installing multiple support pads on a workbench in an embodiment of the present application;

[0054] Figure 5 This is a structural schematic diagram of a diffuser clamped on a workbench along a first direction in an embodiment of the present application;

[0055] Figure 6 A partial view of a claw seat, a nut seat, a driving screw and a fixed claw of the first fixing assembly in an embodiment of the present application;

[0056] Figure 7 An exploded view of a claw seat, a nut seat, a driving screw and a fixed claw of the first fixing assembly in an embodiment of the present application;

[0057] Figure 8 A cross-sectional view of an adjustment component in an embodiment of the present application;

[0058] Fig. 9 This is a structural schematic diagram of the diffuser in the embodiment of the present application being clamped on the workbench along the second direction;

[0059] Fig.10 It is a cross-sectional view of the second fixing component in the embodiment of the present application.

[0060] Among them, the reference numerals in the figure are:

[0061] 10-diffuser; 11-flange; 12-barrel; 13-guide vane; 101a-first end surface; 101d-second end surface; 101f-third end surface; 101s-fourth end surface; 101p-fifth end surface; 101g-sixth end surface; 101h-seventh end surface; 101k-eighth end surface; 101n-ninth end surface; 101b-first outer circular surface; 101c-second outer circular surface; 101r-third outer circular surface; 101e-first inner circular surface; 101q-second inner circular surface; 101z-third inner circular surface; 101w-fourth inner circular surface; 101m-fifth inner circular surface; 101i-sixth inner circular surface; 101j- The seventh inner circular surface; 101u-the inner surface of the first groove body; 101v-the inner surface of the second groove body; 20-the workbench; 21-the T-slot; 22-the lathe claw; 23-the T-bolt; 24-the T-nut; 30-the first fixing assembly; 31-the base; 32-the fixing claw; 33-the claw seat; 34-the driving screw; 35-the nut seat; 40-the second fixing assembly; 41-the bottom pad; 411-the connecting screw; 42-the pressure plate; 43-the adjusting pad; 431-the adjusting screw; 44-the pressure component; 441-the pressure screw; 442-the pressure nut; 50-the supporting pad; 60-the adjusting assembly; 61-the supporting seat; 62-the adjusting head. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0064] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0066] like Figure 1 As shown, the diffuser 10 includes a flange portion 11, a cylinder portion 12 and a guide vane portion 13. The cylinder portion 12 is hollow inside, and the flange portion 11 and the guide vane portion 13 are respectively arranged at the two ends of the axial direction of the cylinder portion 12. The flange portion 11, the cylinder portion 12 and the guide vane portion 13 all have a plurality of mating surfaces for mating with other components in the main pump. After being used for a period of time, the mating surfaces on the diffuser 10 will be deformed due to long-term stress, resulting in the size of the mating surface increasing or decreasing compared to the design size.

[0067] The embodiment of the present application provides a method for repairing the diffuser 10 of the main pump of a nuclear power plant. The method can achieve the purpose of repairing the diffuser 10 by measuring the dimensional deformation of each mating surface of the diffuser 10 and performing cutting processing on the mating surfaces to restore the dimensional accuracy of the mating surfaces and ensure that the connection and coordination between the diffuser 10 and other components in the main pump meet the design requirements.

[0068] The processing equipment used for cutting and repairing the diffuser 10 can be a vertical lathe, or a milling machine, a grinder, or a multi-axis processing machine. The vertical lathe includes a machine body, a workbench 20, a vertical tool holder, and a side tool holder. The workbench 20 is connected to the machine body through a main shaft rotation. Figure 2As shown, the upper surface of the workbench 20 has a plurality of T-slots 21 and a plurality of lathe claws 22. The vertical tool holder is vertically arranged above the workbench 20, and the side tool holder is horizontally arranged on one side of the workbench 20. Both the vertical tool holder and the side tool holder are used to install cutting tools. When repairing the diffuser 10, the diffuser 10 is installed on the workbench 20 with the axis vertical. The workbench 20 drives the diffuser 10 to rotate, and the cutting tools on the vertical tool holder or the side tool holder are used to cut the mating surfaces of the diffuser 10 to restore the dimensional accuracy of the diffuser 10.

[0069] like Figure 3 As shown, the method for repairing the main pump diffuser 10 of a nuclear power plant provided in the embodiment of the present application includes steps S301 to S305.

[0070] In step S301, multiple mating surfaces of the diffuser 10 are divided into first mating surfaces and second mating surfaces; the first mating surfaces include the mating surfaces located on the flange portion 11 and the mating surfaces located on the barrel portion 12 facing and close to the flange portion 11; the second mating surfaces include the mating surfaces located on the guide vane portion 13 and the mating surfaces located on the barrel portion 12 facing and close to the guide vane portion 13.

[0071] Specifically, refer to Figure 1 The multiple mating surfaces on the flange portion 11 include: the first end surface 101a, the second end surface 101d, the third end surface 101f, the first outer cylindrical surface 101b, the second outer cylindrical surface 101c and the first inner cylindrical surface 101e, the first tank body inner surface 101u and the second tank body inner surface 101v, and these mating surfaces can all be classified as first mating surfaces. The multiple mating surfaces on the guide vane portion 13 include: the fourth end surface 101s, the fifth end surface 101p, the third outer cylindrical surface 101r, the second inner cylindrical surface 101q, and the third inner cylindrical surface 101z, and these mating surfaces can all be classified as second mating surfaces.

[0072] The multiple mating surfaces on the barrel portion 12 include: the sixth end surface 101g, the seventh end surface 101h, the eighth end surface 101k, the ninth end surface 101n, the fourth inner circular surface 101w, the fifth inner circular surface 101m, the sixth inner circular surface 101i and the seventh inner circular surface 101j. Among them, the sixth end surface 101g, the seventh end surface 101h and the fourth inner circular surface 101w are all facing or close to the flange portion 11, and can be divided into the first mating surface; the eighth end surface 101k, the ninth end surface 101n, the fifth inner circular surface 101m, the fifth inner circular surface 101m, the sixth inner circular surface 101i and the seventh inner circular surface 101j are all facing or close to the guide vane portion 13, and can be divided into the second mating surface.

[0073] By dividing the multiple mating surfaces of the diffuser 10 into first mating surfaces and second mating surfaces according to the structural characteristics, in the subsequent repair process, the diffuser 10 can be made to process all the first mating surfaces at the same time in one clamping posture, and then the diffuser 10 can be made to process all the second mating surfaces at the same time in another clamping manner, so as to achieve the purpose of completing the repair of all the mating surfaces in two clampings, reduce the number of clamping times of the diffuser 10, reduce the generation of positioning errors, and improve the repair accuracy of the diffuser 10.

[0074] In step S302 , the diffuser 10 is clamped on the workbench 20 along a first direction; the first direction is a direction in which the guide vane portion 13 of the diffuser 10 faces the workbench 20 .

[0075] like Figure 5 As shown, the workbench 20 of the vertical lathe is horizontally arranged. When the diffuser 10 is clamped on the workbench 20 along the first direction, the guide vane portion 13 of the diffuser 10 faces downward and the flange portion 11 faces upward. At this time, multiple first mating surfaces on the diffuser 10 are exposed above the workbench 20 to perform measurement and cutting repair work on each first mating surface.

[0076] Combination Figure 4 and Figure 5 As shown, in some embodiments, the diffuser 10 is clamped to the workbench 20 along a first direction, including:

[0077] Install a support block 50 on the workbench 20;

[0078] The guide vane portion 13 of the diffuser 10 is brought into contact with the end surface of the support block 50 facing away from the workbench 20;

[0079] Installing a first fixing assembly 30 on the workbench 20;

[0080] The first fixing assembly 30 is used to clamp the barrel portion 12 and clamp the diffuser 10 at a first clamping position.

[0081] Specifically, the support pad 50 can be a circular block or a block structure of other shapes, and the bottom of the support pad 50 can be fixed to the T-slot 21 on the workbench 20 by a T-bolt 23. The number of the support pads 50 should be multiple, for example, the number of the support pads 50 is four.

[0082] A plurality of support blocks 50 are arranged in a circle around the rotation axis of the workbench 20. The size of the support blocks 50 and the circular distribution radius of the plurality of support blocks 50 should match the radius size of the end faces on both sides of the diffuser 10. The top of the support block 50 is a plane, and the tops of the plurality of support blocks 50 are flush to form a horizontal positioning surface together, so that the end faces of the flange portion 11 and the guide vane portion 13 of the diffuser 10 can both abut against the tops of the plurality of support blocks 50. The diffuser 10 is supported above the workbench 20 by the plurality of support blocks 50. Compared with directly using the surface of the workbench 20 to abut against the axial end face of the diffuser 10, the contact area of ​​the axial end face of the diffuser 10 is reduced, and the resulting positioning error is smaller.

[0083] In addition, after the support pad 50 is installed on the workbench 20, the end surface of the support pad 50 facing away from the workbench 20 can also be cut. Specifically, the top of the support pad 50 can be cut using a cutting tool on a vertical lathe. When cutting the support pad 50, the vertical lathe is started to rotate the workbench 20, and the cutting tool is controlled to pass through the top of each support pad 50 to cut the top of all the support pads 50 at the same time, thereby ensuring that the top of each support pad 50 is flush, eliminating the installation error generated when the support pad 50 is installed, and making the plane accuracy of the positioning surface formed by the tops of multiple support pads 50 higher, further improving the positioning accuracy of the axial end surface of the diffuser 10.

[0084] When the guide vane portion 13 of the diffuser 10 is in contact with the top surface of the support pad 50, the diffuser 10 can be lifted and moved to the top of the support pad 50 by using an overhead crane or other lifting equipment in the workshop, and then slowly lowered so that the guide vane portion 13 of the diffuser 10 is precisely in contact with the top of the support pad 50. During the lowering process of the diffuser 10, adjustments are made according to the relative positions of the diffuser 10 and the plurality of support pads 50. For example, the diffuser 10 stops moving when the distance between the diffuser 10 and the support pad 50 is relatively close. After fine-tuning the relative positions of the diffuser 10 and the support pads 50, the diffuser 10 is moved downward continuously to ensure that the downward end surface of the guide vane portion 13 is in uniform contact with the end surface of the support pad 50 to avoid tilting or offset. The diffuser 10 is stably supported on the workbench 20 with the guide vane portion 13 facing downward using the plurality of support pads 50.

[0085] The first fixing assembly 30 is a clamping component used to apply radial force to the cylinder portion 12 of the diffuser 10 when the guide vane portion 13 is facing downward. The number of first fixing assemblies 30 is also set to multiple, and multiple first fixing assemblies 30 can also be arranged in a circle on the workbench 20 around the axis of the workbench 20, and are arranged around the circumference of the diffuser 10. Since the guide vane portion 13 has a complex shape and is not easy to be clamped and stressed, radial forces are applied to different positions of the cylinder portion 12 by using multiple first fixing assemblies 30, so that the diffuser 10 is fixed on the workbench 20 by clamping the cylinder portion 12, thereby solving the problem that the guide vane portion 13 cannot be clamped, so that the diffuser 10 can be stably clamped on the workbench 20 with the guide vane portion 13 facing downward.

[0086] The installation order of the plurality of first fixing assemblies 30 can be arbitrary. For example, two or more of the first fixing assemblies 30 can be installed first, and after the diffuser 10 is hoisted onto the support pad 50, the remaining first fixing assemblies 30 can be installed. On the one hand, the plurality of first fixing assemblies 30 installed first are used to locate the hoisting position of the diffuser 10. On the other hand, sufficient hoisting operation space is reserved for the diffuser 10, so as to facilitate adjustment of the position of the diffuser 10 during the hoisting process of the diffuser 10. In addition, after the position of the diffuser 10 is determined, the relative position of each first fixing assembly 30 and the diffuser 10 can be adjusted again so that each fixing claw 32 is aligned with the barrel portion 12 of the diffuser 10.

[0087] like Figure 5-Figure 7As shown, in some embodiments, the first fixing assembly 30 may include a base 31, a fixed claw 32, a claw seat 33, a driving screw 34 and a nut seat 35, the base 31 is mounted on the workbench 20, the claw seat 33 is connected to the side of the base 31 facing away from the workbench 20, the driving screw 34 is rotatably connected to the claw seat 33, the nut seat 35 is slidably connected to the claw seat 33, and the nut seat 35 is threadedly connected to the driving screw 34, and the fixed claw 32 is connected to the nut seat 35. When the base 31 is mounted on the workbench 20, the T-bolt 23 may be pre-embedded in the T-slot 21 corresponding to the workbench 20, and then the first fixing assembly 30 is hoisted onto the workbench 20 as a whole using an overhead crane or other lifting equipment, so that the T-bolt 23 fixes the base 31 on the workbench 20. The barrel 12 also has a reference outer cylindrical surface 101y, and the height of the base 31 matches the height of the reference outer cylindrical surface 101y when the guide vane 13 of the diffuser 10 is facing downward, so that the height of the fixed claw 32 is supported at the reference outer cylindrical surface 101y of the barrel 12. After the base 31 is fixed to the workbench 20, the axial direction of the driving screw 34 is parallel to the radial direction of the diffuser 10, and the fixed claw 32 faces the barrel 12 of the diffuser 10. The fixed claw 32 is moved toward the barrel 12 by rotating the driving screw 34 until the fixed claw 32 abuts against the reference outer cylindrical surface 101y of the barrel 12, so that the fixed claw 32 applies a radial force to the barrel 12.

[0088] Before sliding the fixed claw 32 toward the side of the barrel 12, a protective gasket may be installed at the end of the fixed claw 32 facing the barrel 12. The protective gasket may be made of a metal material or non-metal material with a relatively low hardness such as copper, and the shape of the protective gasket matches the outer surface of the barrel 12. The protective gasket may be clamped between the fixed claw 32 and the barrel 12, or may be pre-fixed to the end of the fixed claw 32 facing the barrel 12 by bonding, fastener connection, etc. Under the action of the protective gasket, the damage to the barrel 12 by the fixed claw 32 when a radial force is applied can be reduced, thereby protecting the barrel 12.

[0089] In some embodiments, the first fixing assembly 30 is used to hold the barrel portion 12 and clamp the diffuser 10 at a first clamping position, including:

[0090] The first fixing assembly 30 clamps the barrel portion 12 with a first pre-clamping force;

[0091] Measuring a first initial runout value of the first mating surface, and adjusting the relative position of the diffuser 10 and the workbench 20 to minimize the first initial runout value;

[0092] measuring a first remeasured run-out value of a first mating surface;

[0093] When the difference between the first initial measured runout value and the first re-measured runout value is within the first range threshold, the diffuser 10 is determined to be in the first clamping position, and the first fixing assembly 30 clamps the cylinder portion 12 with a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

[0094] The first pre-clamping force is a force pre-applied to the body 12 of the diffuser 10, and its purpose is to preliminarily fix the diffuser 10 so that the diffuser 10 can be displaced a small distance under the action of an external force and the clamping position of the diffuser 10 can be adjusted. The magnitude of the first pre-clamping force can be determined according to the process requirements or the experience of the operator, for example, the end of the fixing claw 32 can be in contact with the body 12 of the diffuser 10.

[0095] The first initial runout value refers to the value obtained by measuring the radial runout between the rotation center line of the barrel 12 and the reference surface of the fixing assembly using a special measuring tool when the barrel 12 of the diffuser 10 is in contact with the first fixing assembly 30 in the initial state. This value reflects the natural runout of the barrel 12 when it is not subjected to any clamping force, and is an important parameter for evaluating the machining accuracy and installation status of the barrel 12. By measuring the first initial runout value, it is possible to preliminarily determine whether the concentricity of the barrel 12 meets the technical requirements, providing a basis for subsequent adjustment and clamping.

[0096] The first preliminary runout value can be measured using a tool such as a micrometer. During the test, the micrometer is installed on a vertical lathe, and the diffuser 10 is driven to rotate slowly through the workbench 20, and the reading change of the micrometer is recorded to obtain the first preliminary runout value. During the measurement process, the relative position of the diffuser 10 and the workbench 20 can be adjusted by adjusting the axial or radial displacement of the diffuser 10 to ensure that the coaxiality of the reference axis of the diffuser 10 and the axis of the workbench 20 and the horizontality of the end face of the diffuser 10 are good, so that the deformation of the diffuser 10 can be accurately reflected in subsequent measurements.

[0097] The radial displacement of the diffuser 10 can be achieved by adjusting the position of the fixed claws 32 at each position, and the axial displacement of the diffuser 10 can be achieved by installing at least one adjustment component 60 between the bottom of the diffuser 10 and the workbench 20, and using the adjustment component 60 to change the distance between the corresponding position of the diffuser 10 and the workbench 20. For example, Figure 8 As shown, the adjustment assembly 60 may include a support seat 61 and an adjustment head 62, and the bottom of the adjustment head 62 is threadedly connected to the support seat 61. The support seat 61 and the workbench 20 can be fixed relatively to each other by T-bolts 23, and the adjustment head 62 can be rotated to make it abut against the downward end surface of the diffuser 10. By rotating the adjustment head 62, the height of the corresponding position of the diffuser 10 can be adjusted so that the plane runout value of the upward end surface of the diffuser 10 meets the process requirements.

[0098] The first re-measured runout value refers to the runout value of each first mating surface measured again using a micrometer or other tool after the diffuser 10 is adjusted in position, to determine whether the position of the diffuser 10 is adjusted to a suitable position during the measurement of the first initial measured runout value. The first range threshold can be pre-set according to the use requirements of the diffuser 10 and the process requirements of the repair. When the difference between the first re-measured runout value and the first initial measured runout value is within the first range threshold, it indicates that the diffuser 10 is at the first clamping position.

[0099] In addition, if the difference between the first re-measured runout value and the first initial measured runout value exceeds the first range threshold, the surface diffuser 10 has a large positional offset when adjusting its position. At this time, the diffuser 10 should be repositioned, that is, after adjusting the position of the diffuser 10, the first initial measured runout value of each first mating surface should be measured again, and after fine-tuning the position of the diffuser 10 again, the first re-measured runout value should be measured until the difference between the first re-measured runout value and the first initial measured runout value is within the allowable range, and then the barrel portion 12 of the diffuser 10 is clamped using the first fixed clamping force.

[0100] The first fixed clamping force refers to applying a large radial force to the barrel portion 12 of the diffuser 10 to ensure the clamping stability of the diffuser 10 on the workbench 20 and avoid displacement of the diffuser 10 during subsequent processing. The magnitude of the first fixed clamping force can be determined based on the strength requirements of the diffuser 10 and the operator's experience. In addition, after the diffuser 10 is clamped using the first fixed clamping force, the runout values ​​of each first mating surface can be re-measured to confirm whether the diffuser 10 has positional displacement during the clamping process.

[0101] Specifically, the specific process of measuring the first initial measured runout values ​​and the first re-measured runout values ​​of the plurality of first mating surfaces may include:

[0102] Measure the runout value of the reference outer cylindrical surface 101y. If the runout value deviation of the reference outer cylindrical surface 101y is too large, adjust the fixed clamping claw 32 to adjust the runout value of the reference outer cylindrical surface 101y to the minimum, and record the runout value of the reference outer cylindrical surface 101y; measure the runout value of the second outer cylindrical surface 101c, adjust the fixed clamping claw 32 to adjust the runout value of the second outer cylindrical surface 101c to the minimum, and record the runout value of the second outer cylindrical surface 101c; measure the runout value of the first inner cylindrical surface 101e. If the runout value deviation of the first inner cylindrical surface 101e is too large, adjust the fixed clamping claw 32 to adjust the runout value of the first inner cylindrical surface 101e to the minimum. The runout value of the first inner circular surface 101e is measured, and the runout value of the first end surface 101a is adjusted to the minimum by using the adjustment component 60, and the runout value of the first end surface 101a is recorded; the runout value of the second end surface 101d is measured, and the runout value of the second end surface 101d is adjusted to the minimum by using the adjustment component 60, and the runout value of the second end surface 101d is recorded; the runout value of the third end surface 101f is measured, and compared with the runout value of the first end surface 101a and the runout value of the second end surface 101d, and the runout value of the third end surface 101f is recorded.

[0103] Remeasure the runout value of the reference outer cylindrical surface 101y. If the error is large compared with the runout value of the reference outer cylindrical surface 101y measured for the first time, readjust the position of the diffuser 10; remeasure the runout value of the second outer cylindrical surface 101c, and compare it with the runout value of the second outer cylindrical surface 101c measured for the first time to determine the error size; remeasure the runout value of the first inner cylindrical surface 101e, and compare it with the runout value of the first inner cylindrical surface 101e measured for the first time to determine the error size; remeasure the runout value of the second end face 101d, and compare it with the runout value of the second end face 101d measured for the first time to determine the error size; remeasure the runout value of the third end face 101f, and compare it with the runout value of the third end face 101f measured for the first time to determine the error size; when the above errors are all within the first range threshold, use the fixed clamping claw 32 to clamp the diffuser 10.

[0104] After clamping the diffuser 10, the runout value of the fourth inner circular surface 101w, the runout value of the first inner circular surface 101e, the runout value of the second outer circular surface 101c, the runout value of the second end surface 101d and the runout value of the third end surface 101f are remeasured to see whether the error of the runout value of each first mating surface measured for the first time is within the first range threshold, so as to determine whether the clamping position of the diffuser 10 is accurate.

[0105] In step S303, a first deformation amount of the first mating surface is obtained, and the first mating surface is cut according to the first deformation amount.

[0106] After accurately clamping and positioning the diffuser 10, the first deformation of the first mating surface can be determined based on the runout value of each first mating surface measured for the second time and the design size of the diffuser 10. The processing parameters are determined based on the first deformation, and the vertical lathe is used to cut each first mating surface according to the processing parameters to restore the dimensional accuracy of each first mating surface.

[0107] In some embodiments, obtaining a first deformation amount of a first mating surface, and cutting the first mating surface according to the first deformation amount includes:

[0108] According to the shape of the first mating surface, the first mating surface is divided into a first mating end surface and a first mating circumferential surface;

[0109] Measuring a first end face deformation amount of a first mating end face, and cutting the first mating end face according to the first end face deformation amount, wherein the first end face deformation amount is a deformation amount corresponding to the first mating end face in the first deformation amount;

[0110] The first circumferential surface deformation of the first mating circumferential surface is measured, and the first mating circumferential surface is cut according to the first circumferential surface deformation, wherein the first circumferential surface deformation is the deformation corresponding to the first mating circumferential surface in the first deformation.

[0111] Specifically, the first mating end surface refers to a horizontal surface provided on the diffuser 10, and the first mating circumferential surface is an outer circular surface or an inner circular surface on the diffuser 10. Specifically, refer to Figure 1 Among the multiple first mating surfaces, the first end face 101a, the second end face 101d, the third end face 101f, the sixth end face 101g and the seventh end face 101h are all first mating end faces, and the first outer cylindrical surface 101b, the second outer cylindrical surface 101c, the first inner cylindrical surface 101e and the fourth inner cylindrical surface 101w are all first mating circumferential surfaces.

[0112] It is understandable that the first mating end surface may be cut and repaired first, and then each first mating circumferential surface may be cut and repaired, or each first mating circumferential surface may be cut and repaired first, and then each first mating end surface may be cut and repaired, and this is not limited in this embodiment. When cutting the first mating circumferential surface, a circular face turning tool may be installed on a vertical lathe, and when cutting the first mating end surface, an end face turning tool may be installed on the vertical lathe. By dividing the multiple first mating surfaces into first mating end surfaces and first mating circumferential surfaces for cutting in batches, the number of times the turning tool is loaded and unloaded may be reduced, thereby improving efficiency.

[0113] In some embodiments, measuring the deformation of the first end surface of the first mating end surface and cutting the first mating end surface according to the deformation of the first end surface may include:

[0114] Selecting at least one first mating end surface as a first reference surface, determining a first end surface deformation amount corresponding to the first reference surface according to a first re-measured runout value, and cutting the first reference surface according to the first end surface deformation amount corresponding to the first reference surface;

[0115] The first reference surface after cutting is used as a reference to determine the deformation of the first end surface corresponding to the remaining first matching end surfaces, and then the remaining first matching end surfaces are cut.

[0116] By using the first mating end face after cutting as the first reference surface to determine the first end face deformation of the subsequent first mating end face, the dimensional accuracy of the distance between each first mating end face after turning can be guaranteed. The cutting of each first mating end face can be divided into three times to improve the cutting accuracy and cutting quality. Specifically, the method of sequentially cutting multiple first mating end faces may include:

[0117] According to the run-out value after re-measurement of the first end face 101a in the above steps, the first turning amount of the first end face 101a is determined, and the first end face 101a is turned for the first time. After turning, the distance between the first end face 101a and the second end face 101d and the run-out value of the first end face 101a are measured and recorded; according to the distance between the first end face 101a and the second end face 101d measured after the first turning, the second turning amount is determined, and the first end face 101a is turned for the second time. After turning, After completion, the distance between the first end face 101a and the second end face 101d and the run-out value of the first end face 101a are measured and recorded; according to the distance between the first end face 101a and the second end face 101d measured after the second turning, the third final turning amount is determined, and the first end face 101a is turned for the third time. After turning is completed, the distance between the first end face 101a and the second end face 101d and the run-out value of the first end face 101a are measured again and recorded, and the turning of the first end face 101a is completed.

[0118] The first end face 101a after turning is used as a reference, and the runout value after re-measurement of the second end face 101d in the above steps is used to determine the size of the second end face 101d that needs to be turned, and the second end face 101d is turned three times, and the distance between the second end face 101d and the first end face 101a and the runout value of the second end face 101d are measured after each turning, until the turning of the second end face 101d is completed. The second end face 101d after turning is used as a reference, and the runout value after re-measurement of the third end face 101f in the above steps is used to determine the size of the third end face 101f that needs to be turned, and the third end face 101f is turned three times, and the distance between the third end face 101f and the second end face 101d and the runout value of the third end face 101f are measured after each turning, until the turning of the third end face 101f is completed. The second end face 101d after turning is used as a reference again, and the runout value after re-measurement of the seventh end face 101h in the above step is used to determine the size of the seventh end face 101h that needs to be turned, and the seventh end face 101h is turned three times, and the distance between the seventh end face 101h and the second end face 101d and the runout value of the seventh end face 101h are measured after each turning, until the turning of the seventh end face 101h is completed. The seventh end face 101h after turning is used as a reference, and the runout value after re-measurement of the sixth end face 101g in the above step is used to determine the size of the sixth end face 101g that needs to be turned, and the sixth end face 101g is turned three times, and the distance between the sixth end face 101g and the second end face 101d and the runout value of the sixth end face 101g are measured after each turning, until the turning of the sixth end face 101g is completed.

[0119] The deformation amount of the first mating circumferential surface can be determined by comparing the runout value of the second re-measurement in the process of clamping and positioning the diffuser 10 with the original design data of the diffuser 10. Since the diffuser 10 is always clamped on the workbench 20 with the guide vane portion 13 facing downward during the process of cutting each first mating circumferential surface in sequence, the coaxiality of each first mating circumferential surface after cutting and repair is better. In addition, the number of cutting times for each first mating circumferential surface can be divided into three or more times to ensure that the cutting accuracy of each first mating surface is high. Specifically, the step of cutting multiple first mating circumferential surfaces in sequence may include:

[0120] According to the runout value of the second outer cylindrical surface 101c during the second re-measurement, the first turning amount is determined and the second outer cylindrical surface 101c is turned for the first time. After the turning is completed, the size of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are measured and recorded; according to the size of the second outer cylindrical surface 101c measured after the first turning, the second turning amount is determined and the second outer cylindrical surface 101c is turned for the second time. After the second turning is completed, the size of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are continued to be measured and recorded; according to the size of the second outer cylindrical surface 101c measured after the second turning, the third final turning amount is determined, and the second outer cylindrical surface 101c is turned for the third final time. After the turning is completed, the size of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are measured again. After the outer circle second outer cylindrical surface 101c is processed, the first turning amount is determined and the first outer cylindrical surface 101b is turned for the first time. After turning, the size of the first outer cylindrical surface 101b and the run-out value of the first outer cylindrical surface 101b are measured and recorded; according to the size of the first outer cylindrical surface 101b measured after the first turning, the second turning amount is determined and the first outer cylindrical surface 101b is turned for the second time. After the second turning, the size of the first outer cylindrical surface 101b and the run-out value of the first outer cylindrical surface 101b are continued to be measured and recorded; according to the size of the first outer cylindrical surface 101b measured after the second turning, the third final turning amount is determined, and the first outer cylindrical surface 101b is turned for the third final time. After turning, the size of the first outer cylindrical surface 101b and the run-out value of the first outer cylindrical surface 101b are measured again.

[0121] In addition, after completing the cutting of all the first mating end faces and the first mating circumferential faces, a grooving cutter can be used to perform cutting processing on the first slot body inner surface 101u and the second slot body inner surface 101v on the flange portion 11 according to the above-mentioned cutting method to restore the mating accuracy of the first slot body inner surface 101u and the second slot body inner surface 101v.

[0122] like Fig. 9 and Fig.10 As shown, in step S304 , the diffuser 10 is clamped on the workbench 20 along the second direction; the second direction is the direction in which the flange portion 11 of the diffuser 10 faces the workbench 20 .

[0123] After the diffuser 10 is clamped on the workbench 20 along the first direction and all the first mating surfaces are cut, the first fixing assembly 30 is removed, and the diffuser 10 is lifted and turned over so that the flange portion 11 of the diffuser 10 faces downward and the guide vane portion 13 faces upward. At this time, multiple second mating surfaces on the diffuser 10 are exposed above the workbench 20 so that each second mating surface can be measured and cut for repair.

[0124] In some embodiments, the workbench 20 is provided with a lathe clamping jaw 22; the diffuser 10 is clamped on the workbench 20 along the second direction, including:

[0125] A supporting pad 50 is installed on the workbench 20; the supporting pad 50 is in multiple numbers and arranged in a circular shape;

[0126] The flange portion 11 of the diffuser 10 is placed against the end surface of the support block 50 facing away from the workbench 20;

[0127] The flange portion 11 is clamped by using the lathe jaws 22 to clamp the diffuser 10 at the second clamping position.

[0128] The support block 50 used when the diffuser 10 is clamped on the workbench 20 along the first direction in the above steps can be directly used to position the diffuser 10 when it is clamped along the second direction. The diameter size of the support block 50 is determined according to the end surface size of the guide vane portion 13 and the flange portion 11, so that multiple support blocks 50 can simultaneously support the flange portion 11 and the guide vane portion 13 of the diffuser 10, ensure positioning accuracy, and reduce operation steps. Since the flange portion 11 is first turned, the overall dimensional accuracy of the diffuser 10 can also be ensured to be good by clamping the flange portion 11 that has been cut and repaired. Among them, a protective gasket can also be set between the lathe jaws 22 and the outer peripheral surface of the flange portion 11 to protect the outer peripheral surface of the flange portion 11.

[0129] In some embodiments, the flange portion 11 is clamped by the lathe jaws 22 to clamp the diffuser 10 at the second clamping position, including:

[0130] The lathe jaws 22 clamp the flange portion 11 with a second pre-clamping force;

[0131] Measure the second initial runout value of the second mating surface, and adjust the relative position of the diffuser 10 and the workbench 20 to minimize the second initial runout value;

[0132] Measure the second re-measured runout value of the second mating surface. When the difference between the second initial measured runout value and the second re-measured runout value is within the second range threshold, determine that the diffuser 10 is in the second clamping position, and enable the second fixing assembly 40 to clamp the cylinder portion 12 with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

[0133] The second pre-clamping force is a force pre-applied to the body 12 of the diffuser 10, and its purpose is to preliminarily fix the diffuser 10 so that the diffuser 10 can be displaced a small distance under the action of an external force and the clamping position of the diffuser 10 can be adjusted. The magnitude of the second pre-clamping force can be determined according to the process requirements or the experience of the operator, for example, the end of the lathe jaw 22 can be in contact with the flange 11 of the diffuser 10.

[0134] The second preliminary runout value can be measured using a tool such as a micrometer. During the test, the micrometer is installed on a vertical lathe, and the diffuser 10 is driven to rotate slowly through the workbench 20, and the reading change of the micrometer is recorded to obtain the second preliminary runout value. During the measurement process, the relative position of the diffuser 10 and the workbench 20 can be adjusted by adjusting the axial or radial displacement of the diffuser 10 to ensure that the coaxiality of the reference axis of the diffuser 10 and the axis of the workbench 20 and the horizontality of the end face of the diffuser 10 are good, so that the deformation of the diffuser 10 can be accurately reflected in the subsequent measurement.

[0135] The radial displacement of the diffuser 10 can be achieved by adjusting the position of the lathe jaws 22 at each position, and the axial displacement of the diffuser 10 can be achieved by installing at least one adjustment component 60 between the bottom of the diffuser 10 and the workbench 20, and using the adjustment component 60 to change the distance between the corresponding position of the diffuser 10 and the workbench 20.

[0136] The second re-measured runout value refers to the runout value of each second mating surface measured again using a micrometer or other tool after the diffuser 10 is adjusted in position, to determine whether the position of the diffuser 10 is adjusted to a suitable position during the measurement of the second initial measured runout value. The second range threshold can be pre-set according to the use requirements of the diffuser 10 and the process requirements of the repair. When the difference between the second re-measured runout value and the second initial measured runout value is within the second range threshold, it indicates that the position of the diffuser 10 is adjusted to the second clamping position.

[0137] In addition, if the difference between the second re-measured runout value and the second initial measured runout value exceeds the second range threshold, the surface diffuser 10 has a large positional offset when adjusting its position. At this time, the diffuser 10 should be repositioned, that is, after adjusting the position of the diffuser 10, the second initial measured runout value of each second mating surface should be measured again, and after fine-tuning the position of the diffuser 10 again, the second re-measured runout value should be measured until the difference between the second re-measured runout value and the second initial measured runout value is within the allowable range, and then the second fixed clamping force is used to clamp the barrel portion 12 of the diffuser 10.

[0138] The second fixed clamping force refers to applying a larger radial force to the flange portion 11 of the diffuser 10 to ensure the clamping stability of the diffuser 10 on the workbench 20 and avoid displacement of the diffuser 10 during subsequent processing. The magnitude of the second fixed clamping force can be determined based on the strength requirements of the diffuser 10 and the operator's experience. In addition, after the diffuser 10 is clamped using the second fixed clamping force, the runout values ​​of each second mating surface can be re-measured to confirm whether the diffuser 10 has positional displacement during the clamping process.

[0139] Specifically, the specific process of measuring the second initial measured runout values ​​and the second re-measured runout values ​​of the plurality of second mating surfaces may include:

[0140] Measure the runout value of the second outer cylindrical surface 101c, adjust the fixed clamping claw 32 to adjust the runout value of the second outer cylindrical surface 101c to the minimum, and record the runout value of the second outer cylindrical surface 101c; measure the runout value of the third outer cylindrical surface 101r, if the runout value deviation of the third outer cylindrical surface 101r is too large, adjust the fixed clamping claw 32 to adjust the runout value of the third outer cylindrical surface 101r to the minimum, and record the runout value of the third outer cylindrical surface 101r; measure the runout value of the second inner cylindrical surface 101q, if the runout value deviation of the second inner cylindrical surface 101q is too large, adjust the fixed clamping claw 32 to adjust the runout value of the third outer cylindrical surface 101r to the minimum, and record the runout value of the third outer cylindrical surface 101r; The claw 32 adjusts the runout value of the second inner circular surface 101q to the minimum, and records the runout value of the second inner circular surface 101q; measures the runout value of the third inner circular surface 101z. If the runout value deviation of the third inner circular surface 101z is too large, adjust the fixed clamping claw 32 to adjust the runout value of the third inner circular surface 101z to the minimum, and record the runout value of the third inner circular surface 101z; measures the runout value of the fifth inner circular surface 101m. If the runout value deviation of the fifth inner circular surface 101m is too large, adjust the fixed clamping claw 32 to adjust the runout value of the fifth inner circular surface 101m to the minimum. The run-out value of the sixth inner circular surface 101i is adjusted to the minimum, and the run-out value of the sixth inner circular surface 101i is recorded; the run-out value of the sixth inner circular surface 101i is measured. If the run-out value deviation of the sixth inner circular surface 101i is too large, the fixed clamping claw 32 is adjusted to the minimum, and the run-out value of the sixth inner circular surface 101i is recorded; the run-out value of the seventh inner circular surface 101j is measured. If the run-out value deviation of the seventh inner circular surface 101j is too large, the fixed clamping claw 32 is adjusted to the minimum, and the run-out value of the seventh inner circular surface 101j is recorded Measure the jitter value of the fifth end face 101p, adjust the jitter value of the fifth end face 101p to the minimum using the adjustment component 60, and record the jitter value of the fifth end face 101p; measure the jitter value of the fourth end face 101s, adjust the jitter value of the fourth end face 101s to the minimum using the adjustment component 60, and record the jitter value of the fourth end face 101s; measure the jitter value of the eighth end face 101k, compare it with the jitter value of the fifth end face 101p and the jitter value of the fourth end face 101s, and record the jitter value of the eighth end face 101k.

[0141] Remeasure the runout value of the second outer cylindrical surface 101c. If the error is large compared with the runout value of the second outer cylindrical surface 101c measured for the first time, readjust the position of the diffuser 10; remeasure the runout value of the second inner cylindrical surface 101q, and compare it with the runout value of the second inner cylindrical surface 101q measured for the first time to determine the error size; remeasure the runout value of the third inner cylindrical surface 101z, and compare it with the runout value of the third inner cylindrical surface 101z measured for the first time to determine the error size; remeasure the runout value of the fifth end surface 101p, and compare it with the runout value of the fifth end surface 101p measured for the first time to determine the error size; remeasure the runout value of the fifth inner cylindrical surface 101m, and compare it with the runout value of the fifth inner cylindrical surface 101m measured for the first time Compare and judge the error size; remeasure the runout value of the sixth inner circular surface 101i, and compare it with the runout value of the sixth inner circular surface 101i measured for the first time to judge the error size; remeasure the runout value of the seventh inner circular surface 101j, and compare it with the runout value of the seventh inner circular surface 101j measured for the first time to judge the error size; remeasure the runout value of the fourth end face 101s, and compare it with the runout value of the fourth end face 101s measured for the first time to judge the error size; remeasure the runout value of the eighth end face 101k, and compare it with the runout value of the eighth end face 101k measured for the first time to judge the error size; when the above errors are all within the second range threshold, use the lathe jaws 22 to clamp the diffuser 10.

[0142] After clamping the diffuser 10, remeasure the runout values ​​of the second outer cylindrical surface 101c, the second inner cylindrical surface 101q, the third inner cylindrical surface 101z, the fifth end surface 101p, the fourth end surface 101s and the eighth end surface 101k to see if the errors of the runout values ​​of the second mating surfaces measured for the first time are within the second range threshold, so as to determine whether the clamping position of the diffuser 10 is accurate.

[0143] In some embodiments, clamping the diffuser 10 to the workbench 20 along the second direction further includes: installing a second fixing assembly 40 on the workbench 20 , and using the second fixing assembly 40 to apply axial pressure to the flange portion 11 of the diffuser 10 toward the workbench 20 .

[0144] The second fixing assembly 40 is a structure for applying downward axial pressure to the flange portion 11. As shown in the figure and the figure, the number of the second fixing assembly 40 is also set to be multiple, for example, the number of the second fixing assembly 40 is four. The multiple second fixing assemblies 40 can also be arranged in a circle around the axis of the workbench 20. The multiple second fixing assemblies 40 surround the circumference of the flange portion 11 and apply downward axial pressure to the upward end surface of the flange portion 11 to compress and fix the flange portion 11, improve the stability of the diffuser 10 when the flange portion 11 is clamped downward, improve the clamping stability of the flange portion 11, and avoid displacement during turning due to the high center of gravity of the diffuser 10.

[0145] like Fig.10As shown, in some embodiments, the second fixing assembly 40 may include a bottom pad 41, an adjustment pad 43, a pressure plate 42 and a pressure component 44. The bottom pad 41 is connected to the workbench 20, the pressure plate 42 is against the side of the bottom pad 41 facing away from the workbench 20, and the pressure component 44 is connected to the workbench 20 for applying pressure to the pressure plate 42 toward the workbench 20.

[0146] Specifically, a threaded hole may be provided on the bottom surface of the bottom pad 41. When the bottom pad 41 is installed on the workbench 20, the connecting screw 411 is screwed into the bottom threaded hole of the bottom pad 41, and the T-nut 24 is embedded in the corresponding position of 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 is fitted with the upper surface of the workbench 20 to fix the bottom pad 41 on the workbench 20.

[0147] The adjusting pad 43 is located on the top of the bottom pad 41. 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 total height of the bottom pad 41 and the adjusting pad 43 can be adapted according to the height of the end face of the flange portion 11 facing upward. The pressing plate 42 is a flat plate structure with a certain length. The length of the pressing plate 42 is greater than the width of the bottom pad 41. The pressing plate 42 is placed above the adjusting pad 43 along the radial direction of the diffuser 10, and one side of the pressing plate 42 is pressed against the end face of the flange portion 11 facing upward. After the pressing plate 42 is placed, a downward pressure is applied to the pressing plate 42 using a pressure component 44, so that a downward axial pressure is applied to the flange portion 11 through the pressing plate 42. Under the action of multiple fixing components, the flange portion 11 is pressed tightly against the workbench 20. By setting the adjusting pad 43 on the top of the bottom pad 41, after placing the pressure plate 42, the adjusting pad 43 can be rotated according to the horizontality of the pressure plate 42 to change the top height of the adjusting pad 43, and the top height of the adjusting pad 43 can be adjusted to be flush with the upper end surface of the flange part 11, thereby ensuring that the pressure plate 42 is arranged horizontally and accurately applies pressure to the flange part 11.

[0148] The pressure component 44 may include a pressure screw 441 and a pressure nut 442. One end of the pressure screw 441 is connected to the workbench 20. The pressure plate 42 is provided with a through hole for the pressure screw 441 to penetrate. The pressure nut 442 is threadedly connected to the pressure screw 441. The pressure screw 441 may be vertically installed on the workbench 20. The T-nut 24 may be pre-embedded at a corresponding position in the T-slot 21. The position of the T-nut 24 is opposite to the position of the through hole on the pressure plate 42. The pressure screw 441 is passed through the through hole from top to bottom and then screwed into the T-nut 24 to achieve the connection and fixation of the pressure screw 441 with the workbench 20. After the pressure screw 441 is fixed, the pressure nut 442 is screwed in from the top of the pressure screw 441. The pressure nut 442 is rotated to make it abut against the upper surface of the pressure plate 42, so as to apply pressure to the pressure plate 42 toward one side of the workbench 20, and then the flange portion 11 is applied with a downward axial pressure through the pressure plate 42. The pressure screw 441 may be installed between the bottom pad 41 and the diffuser 10 to be close to the contact portion between the pressure plate 42 and the flange portion 11 , so as to better apply downward pressure to the flange portion 11 through the pressure plate 42 .

[0149] In step S305, a second deformation amount of the second mating surface is obtained, and the second mating surface is cut according to the second deformation amount.

[0150] After accurately clamping and positioning the diffuser 10, the second deformation of the second mating surface can be determined based on the runout value of each second mating surface measured for the second time and the design size of the diffuser 10. The processing parameters are determined based on the second deformation, and each second mating surface is cut using a vertical lathe according to the processing parameters to restore the dimensional accuracy of each second mating surface.

[0151] In some embodiments, obtaining a second deformation amount of the second mating surface, and cutting the second mating surface according to the second deformation amount includes:

[0152] According to the shape of the second mating surface, the second mating surface is divided into a second mating end surface and a second mating circumferential surface;

[0153] Measuring the deformation of the second end face, and cutting the second mating end face according to the deformation of the second end face, wherein the deformation of the second end face is the deformation corresponding to the second mating end face in the second deformation;

[0154] The deformation amount of the second circumferential surface is measured, and the second matching circumferential surface is cut according to the deformation amount of the second circumferential surface. The deformation amount of the second circumferential surface is the deformation amount corresponding to the second matching circumferential surface in the second deformation amount.

[0155] Specifically, the second matching end surface refers to a horizontal surface provided on the diffuser 10, and the second matching circumferential surface is an outer circular surface or an inner circular surface on the diffuser 10. Specifically, refer to Figure 1Among the multiple second mating surfaces, the fourth end face 101s, the fifth end face 101p, the seventh end face 101h, the eighth end face 101k and the ninth end face 101n are all second mating end faces, and the third outer circular surface 101r, the second inner circular surface 101q, the third inner circular surface 101z, the fifth inner circular surface 101m, the sixth inner circular surface 101i and the seventh inner circular surface 101j are all second mating circular surfaces.

[0156] It is understandable that the second mating end surface can be cut and repaired first, and then each second mating circumferential surface can be cut and repaired, or each second mating circumferential surface can be cut and repaired first, and then each second mating end surface can be cut and repaired. This is not limited in this embodiment. When cutting the second mating circumferential surface, a round face turning tool can be installed on the vertical lathe, and when cutting the second mating end surface, an end face turning tool can be installed on the vertical lathe. By dividing multiple second mating surfaces into second mating end surfaces and second mating circumferential surfaces for cutting in batches, the number of times the turning tool is loaded and unloaded can be reduced, and efficiency can be improved.

[0157] In some embodiments, measuring the deformation of the second end face of the second mating end face, and cutting the second mating end face according to the deformation of the second end face, comprises:

[0158] Selecting at least one of the second mating end faces as a second reference face, determining a second end face deformation amount corresponding to the second reference face according to a second re-measured runout value, and cutting the second reference face according to the second end face deformation amount corresponding to the second reference face;

[0159] The second reference surface after cutting is used as a reference to determine the second end deformation amounts corresponding to the remaining second matching end surfaces, and then the remaining second matching end surfaces are cut.

[0160] By using the second mating end face after cutting as the second reference surface to determine the second end face deformation of the subsequent second mating end face, the dimensional accuracy of the distance between each second mating end face after turning can be guaranteed. The cutting of each second mating end face can be divided into three times to improve the cutting accuracy and cutting quality. Specifically, the method of sequentially cutting multiple second mating end faces may include:

[0161] According to the run-out value after re-measurement of the fifth end face 101p in the above steps, the second turning amount of the fifth end face 101p is determined, and the fifth end face 101p is turned for the second time. After turning, the distance between the fifth end face 101p and the fourth end face 101s and the run-out value of the fifth end face 101p are measured and recorded; according to the distance between the fifth end face 101p and the fourth end face 101s measured after the second turning, the second turning amount is determined, and the fifth end face 101p is turned for the second time. After completion, the distance between the fifth end face 101p and the fourth end face 101s and the run-out value of the fifth end face 101p are measured and recorded; according to the distance between the fifth end face 101p and the fourth end face 101s measured after the second turning, the third final turning amount is determined, and the fifth end face 101p is turned for the third time. After turning is completed, the distance between the fifth end face 101p and the fourth end face 101s and the run-out value of the fifth end face 101p are measured again and recorded, thereby completing the turning of the fifth end face 101p.

[0162] The fifth end face 101p after turning is used as a reference, and the runout value after re-measurement of the fourth end face 101s in the above steps is used to determine the size of the fourth end face 101s that needs to be turned, and the fourth end face 101s is turned three times, and the distance between the fourth end face 101s and the fifth end face 101p and the runout value of the fourth end face 101s are measured after each turning, until the turning of the fourth end face 101s is completed. The fifth end face 101p after turning is used as a reference, and the runout value after re-measurement of the eighth end face 101k in the above steps is used to determine the size of the eighth end face 101k that needs to be turned, and the eighth end face 101k is turned three times, and the distance between the eighth end face 101k and the fifth end face 101p and the runout value of the eighth end face 101k are measured after each turning, until the turning of the eighth end face 101k is completed. The eighth end face 101k after turning is used as a reference again, as well as the runout value after re-measurement of the ninth end face 101n in the above step, to determine the size of the ninth end face 101n that needs to be turned, and the ninth end face 101n is turned three times. After each turning, the distance between the seventh end face 101h and the eighth end face 101k and the runout value of the ninth end face 101n are measured until the turning of the seventh end face 101h is completed.

[0163] The deformation amount of the second mating circumferential surface can be determined by comparing the second re-measured runout value in the process of clamping and positioning the diffuser 10 with the original design data of the diffuser 10. Since the diffuser 10 is always clamped on the workbench 20 with the guide vane portion 13 facing downward during the process of cutting each second mating circumferential surface in sequence, the coaxiality of each second mating circumferential surface after cutting and repair is better. In addition, the number of cutting times for each second mating circumferential surface can be divided into three or more times to ensure that the cutting accuracy of each second mating surface is high. Specifically, the step of cutting multiple second mating circumferential surfaces in sequence may include:

[0164] According to the run-out value of the second inner cylindrical surface 101q during the second re-measurement, the second turning amount is determined and the second inner cylindrical surface 101q is turned for the second time. After the turning is completed, the size of the second inner cylindrical surface 101q and the run-out value of the second inner cylindrical surface 101q are measured and recorded; according to the size of the second inner cylindrical surface 101q measured after the second turning, the second turning amount is determined and the second inner cylindrical surface 101q is turned for the second time. After the second turning is completed, the size of the second inner cylindrical surface 101q and the run-out value of the second inner cylindrical surface 101q are continued to be measured and recorded; according to the size of the second inner cylindrical surface 101q measured after the second turning, the third final turning amount is determined, and the second inner cylindrical surface 101q is turned for the third time. After the turning is completed, the size of the second inner cylindrical surface 101q and the run-out value of the second inner cylindrical surface 101q are measured again. After the second inner circular surface 101q is processed, the third inner circular surface 101z, the third outer circular surface 101r, the fifth inner circular surface 101m, the sixth inner circular surface 101i and the seventh inner circular surface 101j are cut in turn according to the above method, and each second mating circular surface is cut at least three times until the cutting of all second mating circular surfaces is completed.

[0165] It should be noted that in this embodiment, there is no restriction on the clamping order of the diffuser 10. Steps S302 and S303 may be performed first, and the diffuser 10 may be clamped on the workbench 20 with the guide vane portion 13 facing downward. After all the first mating surfaces are cut and repaired, the diffuser 10 may be lifted from the support pad 50 and flipped 180° using a flipping device. Steps S304 and S305 may be performed, and the diffuser 10 may be clamped on the workbench 20 with the flange portion 11 facing downward, and all the second mating surfaces may be cut. Of course, steps S304 and S305 may be performed first, and the diffuser 10 may be clamped on the workbench 20 with the flange portion 11 facing downward. After all the second mating surfaces are cut and repaired, steps S302 and S303 may be performed, and the diffuser 10 may be clamped on the workbench 20 with the guide vane portion 13 facing downward, and all the first mating surfaces may be cut and repaired.

[0166] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for repairing a diffuser of a main pump hydraulic component of a nuclear power plant, wherein the diffuser comprises a flange portion, a barrel portion and a guide vane portion, and a processing device for repairing the diffuser comprises a workbench; characterized in that: The diffuser repair method comprises: The multiple mating surfaces of the diffuser are divided into a first mating surface and a second mating surface; the first mating surface includes a mating surface located on the flange portion and a mating surface located on the barrel portion facing and close to the flange portion; the second mating surface includes a mating surface located on the guide vane portion and a mating surface located on the barrel portion facing and close to the guide vane portion; Clamp the diffuser on the workbench along a first direction; the first direction is the direction of the guide vane portion toward the workbench; Acquiring a first deformation amount of the first mating surface, and cutting the first mating surface according to the first deformation amount; Clamp the diffuser to the workbench along a second direction; the second direction is the direction of the flange portion toward the workbench; A second deformation amount of the second mating surface is obtained, and the second mating surface is cut according to the second deformation amount.

2. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 1, characterized in that: The workbench is equipped with a support pad; the step of clamping the diffuser on the workbench along a first direction comprises: Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape; The guide vane portion is brought into contact with the end surface of the support block facing away from the workbench; Install a first fixing assembly on the workbench, wherein the first fixing assembly is in plurality and is arranged around the diffuser; The first fixing assembly is used to clamp the barrel portion, and the diffuser is clamped at a first clamping position.

3. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 2, characterized in that: The method of clamping the barrel portion using the first fixing assembly to clamp the diffuser at a first clamping position includes: enabling the first fixing assembly to clamp the barrel portion with a first pre-clamping force; Measuring a first initial run-out value of the first mating surface, and adjusting the relative position of the diffuser and the workbench to minimize the first initial run-out value; measuring a first remeasured run-out value of the first mating surface; When the difference between the first initial measured runout value and the first re-measured runout value is within a first range threshold, it is determined that the diffuser is in the first clamping position, and the first fixing assembly clamps the cylinder portion with a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

4. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 3, characterized in that: The obtaining of a first deformation amount of the first mating surface and cutting the first mating surface according to the first deformation amount includes: According to the shape of the first mating surface, dividing the first mating surface into a first mating end surface and a first mating circumferential surface; Measuring a deformation amount of a first end face, and cutting the first mating end face according to the deformation amount of the first end face, wherein the deformation amount of the first end face is a deformation amount corresponding to the first mating end face in the first deformation amount; The deformation amount of the first circumferential surface is measured, and the first matching circumferential surface is cut according to the deformation amount of the first circumferential surface, wherein the deformation amount of the first circumferential surface is the deformation amount corresponding to the first matching circumferential surface in the first deformation amount.

5. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 4, characterized in that: The number of the first mating end faces is multiple, the first end face deformation amount is correspondingly multiple, and the measuring of the first end face deformation amount and cutting the first mating end face according to the first end face deformation amount include: Selecting at least one of the first mating end faces as a first reference face, determining the first end face deformation amount corresponding to the first reference face according to the first re-measured run-out value, and cutting the first reference face according to the first end face deformation amount corresponding to the first reference face; The first reference surface after cutting is used as a reference to determine the deformation of the first end surface corresponding to the remaining first matching end surfaces, and then the remaining first matching end surfaces are cut.

6. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 1, characterized in that: The workbench is provided with a lathe clamping claw and a supporting pad; the step of clamping the diffuser on the workbench along the second direction comprises: Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape; The flange is brought into contact with the end surface of the support block facing away from the workbench; The flange portion is clamped by using the lathe jaws to clamp the diffuser at a second clamping position.

7. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 6, characterized in that: The method of clamping the flange portion using the lathe jaws to clamp the diffuser at a second clamping position includes: causing the lathe jaws to clamp the flange portion with a second pre-clamping force; Measuring a second initial run-out value of the second mating surface, and adjusting the relative position of the diffuser and the workbench to minimize the second initial run-out value; measuring a second remeasured run-out value of the second mating surface; When the difference between the second initial measured runout value and the second re-measured runout value is within a second range threshold, it is determined that the diffuser is in the second clamping position, and the second fixing assembly clamps the cylinder portion with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

8. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 7, characterized in that: The obtaining of the second deformation amount of the second mating surface and cutting the second mating surface according to the second deformation amount includes: According to the shape of the second mating surface, dividing the second mating surface into a second mating end surface and a second mating circumferential surface; Measuring the deformation of the second end face, and cutting the second mating end face according to the deformation of the second end face, wherein the deformation of the second end face is the deformation of the second mating end face corresponding to the deformation of the second deformation; The deformation amount of the second circumferential surface is measured, and the second mating circumferential surface is cut according to the deformation amount of the second circumferential surface, wherein the deformation amount of the second circumferential surface is the deformation amount corresponding to the second mating circumferential surface in the second deformation amount.

9. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to claim 8, characterized in that: The number of the second mating end faces is multiple, and the deformation amount of the second end faces is correspondingly multiple. The method of measuring the deformation amount of the second end faces and cutting the second mating end faces according to the deformation amount of the second end faces includes: Selecting at least one of the second mating end faces as a second reference face, determining the deformation of the second end face corresponding to the second reference face according to the second re-measured run-out value, and cutting the second reference face according to the deformation of the second end face corresponding to the second reference face; The second reference surface after cutting is used as a reference to determine the deformation of the second end corresponding to the remaining second matching end surfaces, and cut the remaining second matching end surfaces.

10. The method for repairing the diffuser of the hydraulic component of the main pump of a nuclear power plant according to any one of claims 6 to 9, characterized in that: The step of clamping the diffuser on the workbench along the second direction further comprises: A second fixing component is installed on the workbench, and the second fixing component is used to apply an axial pressure toward the workbench to the flange portion; the number of the second fixing components is multiple and they are arranged around the periphery of the diffuser.

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