Impeller dismounting and mounting device for nuclear-grade equipment

Abstract

The invention belongs to the technical field of nuclear power station nuclear-grade rotating equipment maintenance engineering, and particularly relates to a nuclear-grade equipment impeller dismounting and mounting device. The impeller cone ring is installed at the matching position of the pump shaft and the impeller and is a semi-open ring, the warping and striking pressing plate is installed on the lower portion of the impeller cone ring, the front section of the warping and striking pressing plate is ejected into an opening of the impeller cone ring, the warping and striking pressing plate is fixed through a sleeve of the pull rod and the ejector rod, and the pull rod and the ejector rod are fastened to the auxiliary pressing plate. The protection plate and the protection plate auxiliary rod are connected with the pump shaft, the jack oil pipeline is connected with the jack pressing device, and a lifting sleeve of the jack pressing device is placed above the pulling plate. The device is simple in structure, simple in installation step and high in stability in the using process, damage to equipment in the dismounting process is avoided, and meanwhile the risks such as irradiation dose borne by maintainers can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant nuclear-grade rotating equipment maintenance engineering, and in particular relates to a nuclear-grade equipment impeller disassembly and assembly device. Background Art

[0002] The impeller of nuclear power plant's nuclear-grade rotating equipment is one of the most important parts. It can realize the energy conversion of the medium in the equipment. Its function is to transfer the mechanical energy of the prime mover to the fluid, so that the fluid obtains pressure energy and kinetic energy. The difference in the hydraulic performance of the impeller has a great influence on the efficiency of the rotating equipment. Therefore, in each dismantling and overhaul, the impeller parts must be disassembled according to the requirements of the technical manual and non-destructive testing must be carried out.

[0003] After the rotating equipment has been running for a long time, it is also limited by the structure of the equipment itself. During the dismantling of the equipment, after the mechanical sealing components are removed, the mass of the remaining parts, the pump shaft and the impeller, will be borne by the impeller cone ring. The impeller cone ring itself is designed as a semi-open ring, which closes and tightens after bearing the weight of the impeller. At the same time, the inner side is limited by the pump shaft and cannot be further tightened, which leads to a further reduction in the fitting clearance between the cone ring, impeller and pump shaft, making the clearance between the cone ring and the pump shaft, and the clearance between the cone ring and the impeller mutually constrained, making the work of removing the cone ring extremely difficult.

[0004] In the past, when performing the disassembly and assembly of the impeller of nuclear-grade equipment, in order to ensure that the equipment does not fall after the cone ring is removed and to ensure the safety of the operators themselves, it is necessary to use a lifting trolley to support the impeller. The working space is very small and only one person can work independently. The disassembly method used in the past is to use a hand hammer and a flat-blade screwdriver to hit the reserved gap of the cone ring, so that the clearance between the cone ring and the pump shaft is increased, and the cone ring is loosened and unloaded, so that the cone ring is separated from the pump shaft and the impeller. During the disassembly process, the tools directly contact the equipment, which is easy to damage the pump shaft and the impeller cone ring. At the same time, the impeller cone ring is easy to be damaged and hurt by knocking and falling directly after removal, which is easy to cause harm to the operators. During the work, the operators need to wear radiation protection accessories such as air suits and air masks, and keep the upward working method throughout the whole process. The physical exertion of the personnel is huge, resulting in low work efficiency, and it takes a long time and manpower. The flow medium of the hydraulic components of the equipment contains radioactivity, so the maintenance personnel need to bear a large radiation dose during the disassembly and assembly process. Summary of the invention

[0005] The purpose of the present invention is to provide a nuclear-grade equipment impeller disassembly and assembly device, which has a simple structure, concise installation steps, and strong stability during use, thereby avoiding damage to the equipment during the disassembly process and effectively reducing the risk of radiation dose to maintenance personnel.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A nuclear-grade equipment impeller disassembly and assembly device, wherein the impeller cone ring is installed at the fitting position of the pump shaft and the impeller, the impeller cone ring is a semi-open ring, the impact pressure plate is installed at the lower part of the impeller cone ring, and the front section is pushed into the opening of the impeller cone ring, the impact pressure plate is fixed by the sleeve and the push rod of the pull rod, the pull rod and the push rod are respectively fastened to the auxiliary pressure plate, the pull plate is installed on the pull rod, the protective plate and the protective plate auxiliary rod are connected to the pump shaft, the jack oil pipeline is connected to the jack pressure device, and the lifting sleeve of the jack pressure device is placed above the pull plate.

[0008] The pull rod is fastened to the auxiliary pressure plate by a pull rod locking nut.

[0009] The push rod is fastened to the auxiliary pressure plate by a push rod locking nut.

[0010] The pull plate is installed on the pull rod through the pull plate locking nut, and the position of the pull plate can be adjusted through the pull plate locking nut.

[0011] The guard plate and the guard plate auxiliary rod are connected to the pump shaft through the guard plate fastening screw.

[0012] The impeller cone ring removal work includes the following operations: Check that there is no abnormality in the hydraulic device of the special lifting trolley for removable parts of the main pump; check that the fasteners of the impeller cone ring disassembly and assembly device are in good condition, the connection is firm, and there is no abnormality in the jack oil pipeline; tighten the pressure maintaining knob of the jack pressure device, press the pressure arm of the jack pressure device to perform the pressure work, and the pressure increase during the pressurization process needs to be gradual until the impeller cone ring is successfully removed.

[0013] The beneficial effects achieved by the present invention are:

[0014] The nuclear-grade equipment impeller disassembly and assembly device of the present invention has a simple structure and can reduce the manpower required for on-site operations;

[0015] The nuclear-grade equipment impeller disassembly and assembly device of the present invention has simple installation steps and can improve the disassembly efficiency of the impeller cone ring;

[0016] The components of the nuclear-grade equipment impeller disassembly and assembly device of the present invention are stably connected, which can avoid damage to the equipment during the disassembly process;

[0017] The nuclear-grade equipment impeller disassembly and assembly device of the present invention can be used as a whole after being assembled, and can reduce the radiation dose level of operators;

[0018] A nuclear-grade equipment impeller disassembly and assembly device of the present invention is provided with a protective plate, which can avoid the risk of injuring people when the cone ring falls off. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a nuclear-grade equipment impeller disassembly and assembly device provided by the present invention;

[0020] Figure 2A cross-sectional view of a nuclear-grade equipment impeller disassembly and assembly device provided by the present invention;

[0021] Figure 3 A diagram of a protective plate of a nuclear-grade equipment impeller removal device provided by the present invention;

[0022] In the figure: 1. pump shaft, 2. impeller, 3. jack oil pipeline, 4. jack pressure device, 5. protective plate fastening screw, 6. impact pressure plate, 7. push rod, 8. pull rod, 9. push rod locking nut, 10. pull rod locking nut, 11. pull plate locking nut, 12. auxiliary pressure plate, 13. pull plate, 14. impeller cone ring, 15. protective plate, 16. protective plate auxiliary rod. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] A nuclear-grade equipment impeller disassembly and assembly device is composed of a pump shaft 1, an impeller 2, a jack oil pipeline 3, a jack pressing device 4, a protective plate fastening screw 5, a tilting pressure plate 6, a push rod 7, a pull rod 8, a push rod locking nut 9, a pull rod locking nut 10, a pull plate locking nut 11, an auxiliary pressure plate 12, a pull plate 13, an impeller cone ring 14, a protective plate 15, and a protective plate auxiliary rod 16. The tilting pressure plate is fixed to the cone ring through the push rod; the auxiliary pressure plate is fixed to the push rod locking nut through the pull rod locking nut; the pull plate is fixed to the pull rod through the pull plate locking nut; the protective plate is fixed to the pump shaft through the protective plate fastening screw.

[0025] The impeller cone ring 14 is installed at the matching position of the pump shaft 1 and the impeller 2. The impeller cone ring 14 is a semi-open ring. The impact pressure plate 6 is installed at the lower part of the impeller cone ring 14, and the front section is pushed into the opening of the impeller cone ring 14. The impact pressure plate 6 is fixed by the sleeve of the pull rod 8 and the push rod 7. The pull rod 8 and the push rod 7 are fastened to the auxiliary pressure plate 12 by the pull rod locking nut 10 and the push rod locking nut 9 respectively. The pull plate 13 is installed on the pull rod 8 by the pull plate locking nut 11. The position of the pull plate 13 can be adjusted by the pull plate locking nut 11. The protective plate 15 and the protective plate auxiliary rod 16 are connected to the pump shaft 1 through the protective plate fastening screw 5. After the jack oil pipeline 3 is connected to the jack pressing device 4, the lifting sleeve of the jack pressing device 4 is placed above the pull plate 13.

[0026] The present invention is implemented in this way:

[0027] Step (1) Installation of the impeller removal device includes the following operations:

[0028] Step (1.1) Check and confirm that there is no radioactive medium leakage inside the removable parts of the main pump;

[0029] Step (1.2) Check that the upper mechanical seal assembly housing of the main pump removable parts has been completely disassembled and lifted out;

[0030] Step (1.3) Check that all locking components in the impeller locking device of the main pump that can be removed have been disassembled;

[0031] Step (1.4) Check that the main pump removable parts inspection stand has been leveled and that all support points are stable and not slipping;

[0032] Step (1.5) Check that the lifting trolley for the main pump's removable parts is flexible and that the hydraulic support parts are well sealed and leak-free;

[0033] Step (1.6) Push the special lifting trolley for the removable parts of the main pump to the bottom of the removable parts of the main pump;

[0034] Step (1.7) Adjust the position of the special lifting trolley for the removable parts of the main pump so that it fits the straight opening of the impeller of the removable parts of the main pump;

[0035] Step (1.8) Adjust the height of the lifting trolley for the removable parts of the main pump so that it touches the impeller of the removable parts of the main pump;

[0036] Step (1.9) Adjust the height of the lifting trolley for the removable parts of the main pump so that it can support the impeller of the removable parts of the main pump;

[0037] Step (1.10) The operator checks that there is no abnormality in the gas source system and that the pipelines connecting the gas mask and the gas suit are unobstructed and without abnormality;

[0038] Step (1.11) Operators shall wear additional radiation protection articles such as paper clothes, rubber gloves, waterproof high-top shoe covers and air masks as required, and take personal protection measures;

[0039] Step (1.12) The operator enters the working area below the impeller after confirming that he can breathe normally in the air mask;

[0040] Step (1.13) screw the push rod 7 into the threaded hole of the impact plate 6 through the thread of the push rod 7 to connect and fix the two;

[0041] Step (1.14) Use a hand hammer to knock the lower part of the impact plate 6 so that the front section of the impact plate 6 enters the reserved gap of the impeller cone ring 14;

[0042] Step (1.15) insert the tie rod 8 into the reserved hole of the impact pressure plate 6, and screw the three tie rods 8 into the threaded holes of the impeller cone ring 14 through threads to fix the impact pressure plate 6, tie rods 8 and impeller cone ring 14;

[0043] Step (1.16): insert the auxiliary pressing plate 12 into the pull rod 8 and the push rod 7 through the reserved hole, rotate the pull rod locking nut 10 to lift the auxiliary pressing plate 12, tighten the push rod locking nut 9 of the pull rod 8, and fix the pull rod 8;

[0044] Step (1.17): insert the pull plate 13 into the pull rod 8 through the reserved hole, fix the pull plate by tightening the pull plate locking nut 11, and adjust the pull plate 13 to be level;

[0045] Step (1.18) fix the protective plate 15 on the shaft through the protective plate fastening screw 5;

[0046] Step (1.19) Place the jack pressing device 4 on the pull plate 13, and place an auxiliary pad on top of the jack pressing device 4 according to the actual situation on site;

[0047] Step (1.20) controls the distance between the jack pressing device 4 and the shaft head of the removable component of the main pump by adjusting the pull plate locking nut 11, ensuring that the pressure-raising stroke of the jack pressing device 4 is greater than the distance between the shaft head and the jack pressing device 4;

[0048] Step (1.21) Check that the jack oil pipeline 3 is not damaged, and connect the jack oil pipeline 3 to the oil pipe joint of the jack pressure device 4;

[0049] The installation of the impeller disassembly and assembly device in step (1) has been completed through the above operations. The removal of the impeller cone ring in step (2) is implemented, including the following operations:

[0050] Step (2.1) Check that there is no abnormality in the hydraulic device of the lifting trolley dedicated to the main pump's removable parts;

[0051] Step (2.2) Check that the fasteners of the impeller cone ring disassembly and assembly device are in good condition, the connection is firm, and there is no abnormality in the jack oil pipeline 3;

[0052] Step (2.3) tighten the pressure-maintaining knob of the jack-pressing device 4, press the pressing arm of the jack-pressing device 4 to perform the pressing work. The pressure rise during the pressurization process needs to be gradual until the impeller cone ring is successfully disassembled.

Claims

1. A nuclear-grade equipment impeller disassembly and assembly device, characterized in that: The impeller cone ring is installed at the joint of the pump shaft and the impeller. The impeller cone ring is a semi-open ring. The impact pressure plate is installed at the lower part of the impeller cone ring. The front section is pushed into the opening of the impeller cone ring. The impact pressure plate is fixed by the sleeve and the push rod of the pull rod. The pull rod and the push rod are fastened to the auxiliary pressure plate respectively. The pull plate is installed on the pull rod. The protective plate and the protective plate auxiliary rod are connected to the pump shaft. The jack oil pipeline is connected to the jack pressure device. The lifting sleeve of the jack pressure device is placed above the pull plate.

2. The nuclear-grade equipment impeller disassembly and assembly device according to claim 1, characterized in that: The pull rod is fastened to the auxiliary pressure plate by a pull rod locking nut.

3. The nuclear-grade equipment impeller disassembly and assembly device according to claim 1, characterized in that: The push rod is fastened to the auxiliary pressure plate by a push rod locking nut.

4. The nuclear-grade equipment impeller disassembly and assembly device according to claim 1, characterized in that: The pull plate is installed on the pull rod through the pull plate locking nut, and the position of the pull plate can be adjusted through the pull plate locking nut.

5. The nuclear-grade equipment impeller disassembly and assembly device according to claim 1, characterized in that: The guard plate and the guard plate auxiliary rod are connected to the pump shaft through the guard plate fastening screw.

6. The nuclear-grade equipment impeller disassembly and assembly device according to claim 1, characterized in that: The removal of the impeller cone ring includes the following operations: Check that there is no abnormality in the hydraulic device of the special lifting trolley for the removable parts of the main pump; Check that all fasteners of the impeller cone ring disassembly and assembly device are in good condition, the connection is firm, and there is no abnormality in the jack oil pipeline; tighten the pressure maintaining knob of the jack pressure device, press the pressure arm of the jack pressure device to carry out the pressure work, and the pressure rise during the pressurization process needs to be gradual until the impeller cone ring is successfully disassembled.

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