Method for dismounting a gas turbine sleeve nut

Abstract

The application provides a gas turbine sleeve shaft nut dismounting method, comprising the following steps: S1, installing a low vortex rotor support disc; S2, installing a front casing hoisting disc; S3, disassembling a low pressure casing; S4, installing a rotor auxiliary support plate; S5, installing a low pressure part sleeve limiting block; S6, disassembling a bolt; S7, disassembling a low pressure assembly; S8, cutting a sleeve shaft nut; and S9, installing a transition section adapter disc. In the vertical state of the front casing of the unit, the low pressure casing is dismounted, the connecting piece of the rear shaft neck of the low pressure rotor is dismounted, the low pressure part is separated from the unit as a whole, the sleeve shaft nut is exposed from the deep rotor, the operable space is expanded, the stability is increased, the remaining components are not damaged, and the normal maintenance and inspection of the gas turbine are ensured.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine assembly, and specifically relates to a method for disassembling the bushing nut of a gas turbine. Background Technology

[0002] The bushing nut is a key component in gas turbines, connecting the low-pressure compressor rotor and the low-pressure turbine rotor. It is located inside the low-pressure compressor rotor cavity, 2000mm from the rotor end. The conventional disassembly method involves using an extended wrench with a force-saving device. However, the harsh working environment of gas turbines means that if the threads are damaged and jammed, disassembly with an extended wrench will be impossible, significantly impacting normal disassembly and inspection of the gas turbine. Previously, when thread damage prevented proper disassembly of the bushing nut, an extended cutting tool was often used. However, due to the bushing nut's installation position, the extended cutting tool (approximately 2000mm long) is extremely difficult to control precisely. Any movement can damage internal rotor components, causing irreparable damage. Summary of the Invention

[0003] The purpose of this invention is to provide a method for disassembling the bushing nut of a gas turbine, which ensures that the bushing nut can be disassembled without damaging other parts.

[0004] A method for disassembling a gas turbine bushing nut includes the following steps:

[0005] S1, Install the low-vortex rotor support plate;

[0006] S2, Install the front casing lifting plate;

[0007] S3, Disassemble the low-pressure casing;

[0008] S4, Install the rotor auxiliary support plate;

[0009] S5, Install the low-pressure component limit block;

[0010] S6, disassemble the bolt;

[0011] S7, disconnect the low-voltage component;

[0012] S8, cut sleeve nut;

[0013] S9, install the transition section adapter plate.

[0014] Further, S1 specifically involves: hoisting the front casing of the gas generator downwards onto the lifting platform, disassembling the connecting piece between the turbine guide and the low-vortex support ring, removing the low-vortex support ring, installing the low-vortex rotor support disc on the rear flange of the turbine guide, and screwing the connecting sleeve into the internal thread of the low-vortex rotor.

[0015] Furthermore, S2 specifically involves: flipping the gas turbine, placing the low-vortex support ring downwards on the lifting platform, securing it, and connecting a sling, a hand-operated hoist, and a crane at the front casing adapter plate to apply slight stress to the sling.

[0016] Furthermore, S3 specifically involves: removing the front and rear flanges and the connecting parts of the split surface of the low-pressure casing, and using a mobile small crane to sequentially remove the two halves of the low-pressure casing.

[0017] Furthermore, S4 specifically involves installing a rotor auxiliary support plate at the rear flange of the rotatable casing.

[0018] Furthermore, S5 specifically involves installing a limiting block on the intake flange of the transition section.

[0019] Furthermore, S6 specifically involves removing the connecting bolts at the rear journal of the low-pressure rotor.

[0020] Furthermore, S7 specifically involves: using a hydraulic jack and a special jack to detach the low-pressure component, flipping the low-pressure component so that the front casing faces downwards and is secured to the assembly base, followed by normal disassembly.

[0021] Furthermore, S8 specifically involves cutting the sleeve nut using an angle grinder and a wind grinder.

[0022] Furthermore, S9 specifically involves: installing a transition section adapter plate at the front end of the transition section to fix the rear journal of the low-pressure rotor after flipping, preventing it from falling off; flipping the high-pressure assembly so that the transition section faces downwards; pulling out the low-pressure rotor; and then proceeding with normal disassembly.

[0023] The beneficial effects of this invention are as follows:

[0024] (1) This invention provides a disassembly solution for disassembling a sleeve nut with damaged threads. It solves the disassembly requirement that the sleeve nut cannot be disassembled using an extended wrench, and achieves the purpose of removing the sleeve nut without damaging other parts, thereby completing the disassembly and inspection task of the gas turbine.

[0025] (2) Disconnect the low-pressure casing and the low-pressure rotor, and expose the sleeve nut to the outside to expand the operating space.

[0026] (3) The cutting tool can cut the sleeve nut at close range, increasing stability and reducing the risk of damaging other parts.

[0027] (4) The decomposition method follows the requirements of gas turbine decomposition, reduces operation steps, and saves working time. Attached Figure Description

[0028] Figure 1 Schematic diagram of the installation of the low-vortex rotor support plate;

[0029] Figure 2This is a schematic diagram of the low-vortex rotor support disk-chassis structure.

[0030] Figure 3(a) is a schematic diagram of the low-vortex rotor support disk-connecting sleeve structure A, and Figure 3(b) is a schematic diagram of the low-vortex rotor support disk-connecting sleeve structure B;

[0031] Figure 4(a) is a schematic diagram of the low-vortex rotor support disk-support structure A; Figure 4(b) is a schematic diagram of the low-vortex rotor support disk-support structure B; Figure 4(c) is a schematic diagram of the low-vortex rotor support disk-support structure C;

[0032] Figure 5 Schematic diagram of the front casing lifting plate installation;

[0033] Figure 6 This is a schematic diagram of the front casing lifting plate structure;

[0034] Figure 7 A schematic diagram of the rotor auxiliary support plate installation;

[0035] Figure 8 This is a schematic diagram of the rotor auxiliary support plate structure;

[0036] Figure 9 This is a schematic diagram of the limit block installation.

[0037] Figure 10 This is a schematic diagram of the limiting block structure;

[0038] Figure 11 This is a schematic diagram of the push rod structure;

[0039] Figure 12(a) is a schematic diagram of the process nut structure A, and Figure 12(b) is a schematic diagram of the process nut structure B;

[0040] Figure 13(a) Schematic diagram of the positioning sleeve structure A; Figure 13(b) Schematic diagram of the positioning sleeve structure B;

[0041] Figure 14 This is a schematic diagram of the cutting method for the sleeve nut;

[0042] Figure 15 This is a schematic diagram of the transition section adapter plate installation;

[0043] Figure 16 This is a schematic diagram of the transition section adapter plate-chassis structure;

[0044] Figure 17(a) is a schematic diagram of the transition section adapter plate-support structure A, Figure 17(b) is a schematic diagram of the transition section adapter plate-support structure B, and Figure 17(c) is a schematic diagram of the transition section adapter plate-support structure C. Detailed Implementation

[0045] The present invention will now be further described with reference to the accompanying drawings.

[0046] A method for disassembling a gas turbine bushing nut includes the following steps:

[0047] S1, Install low-vortex rotor support plate

[0048] Combination Figure 1 , Figure 2 Figures 3 and 4 (a, b, c) show that the low-vortex rotor support disk used in this invention includes a chassis 1, a connecting sleeve 2, and a bracket 3, which together form the low-vortex rotor support disk. The chassis 1 is connected to the turbine bearing casing by the bracket 3 and fixed by bolts. The thread at the front end of the connecting sleeve 2 is connected to the internal thread of the low-vortex rotor and fixed by bolts.

[0049] S2, Install the front casing lifting plate

[0050] Combination Figure 5 , Figure 6 The front casing lifting plate 4 used in this invention is connected and fixed to the front casing by bolts. A lifting strap, a hand chain hoist, and a crane are connected at the front casing adapter plate so that the lifting strap is slightly stressed.

[0051] S3, Disassemble the low-pressure casing

[0052] Remove the front and rear flanges and connecting parts of the low-pressure casing, and use a mobile small crane to remove the two halves of the low-pressure casing one by one.

[0053] S4, Install rotor auxiliary support plate

[0054] Combination Figure 7 , Figure 8 The rotor auxiliary support plate used in this invention is connected and fixed to the rotatable casing by bolts. It can be used for rotor centering to prevent swaying and blade collision. It can also serve as a fulcrum when the low-pressure section is flipped.

[0055] S5, Install low-voltage component limit block

[0056] Combination Figure 9 , Figure 10 The low-pressure sleeve limiting block used in this invention is connected to the transition section casing by bolts, and the front flange is used to axially limit the low-pressure sleeve after it is disengaged to prevent collisions at the moment of disengagement.

[0057] S6, Disassemble bolts

[0058] Remove the connecting bolts at the rear journal of the low-pressure rotor.

[0059] S7, disconnect the low-voltage component

[0060] Combination Figure 11Figures 12(a, b) and 13(a, b) illustrate the push rod, process nut, and positioning sleeve used in this invention. The push rod is hoisted onto the sleeve nut using a lifting ring. For ease of installation, the sleeve of the push rod is chamfered. To prevent the push rod from being too long and tilting under load, a positioning sleeve is installed at the front end of the push rod. The inner wall of the rotor provides centering for the push rod, ensuring it does not tilt under load. The original low-pressure front nut of the unit is replaced with a process nut. A lockable hydraulic jack is connected using the threaded hole on the process nut. The jack handle is slowly and evenly pressed down, while simultaneously observing the gap at the rotor connection point, to disengage the low-pressure assembly.

[0061] After the low-voltage component is detached, remove the low-voltage section sleeve limit block, flip the low-voltage component front casing downwards to the assembly base and tighten it, then proceed with normal disassembly.

[0062] S8, Cutting sleeve nut

[0063] Use protective cloth, rubber, etc. to seal the open hole to prevent debris from entering the gas turbine during cutting. Use tools such as angle grinder and air grinder to cut the sleeve nut, and observe the cutting depth at any time to prevent damage to the threads of the low-pressure turbine rotor. When the cutting depth and distance are appropriate, use a flaring tool to remove the sleeve nut.

[0064] S9, Install transition section adapter plate

[0065] Combination Figure 15 , Figure 16 Figure 17(a, b, c) shows the transition section adapter plate used in this invention, which includes a chassis 9 and a bracket 10, together forming the transition section adapter plate. The chassis 9 is connected to the transition section casing by the bracket 10 and fixed with bolts. The support height of the bracket 10 is determined by the axial distance from the rear journal of the low-pressure rotor to the transition section. After the low-pressure rotor is removed, the rear journal of the low-pressure rotor is no longer fixed and is connected to the bottom of the transition section adapter plate by bolts.

[0066] Turn over the high-pressure components (including the combustion chamber and gas turbine) for subsequent routine disassembly and inspection.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for disassembling a gas turbine bushing nut, the bushing nut being used to connect a low-pressure compressor rotor and a low-pressure turbine rotor, characterized in that... Includes the following steps: S1, Install the low-vortex rotor support plate; Hoist the gas generator front casing downwards onto the lifting platform, disconnect the connection between the turbine guide and the low vortex support ring, remove the low vortex support ring, and install the low vortex rotor support plate on the rear flange of the turbine guide. The low vortex rotor support plate includes a chassis, a connecting sleeve, and a bracket. Use the connecting sleeve to screw into the internal thread of the low vortex rotor. S2, Install the front casing lifting plate; The gas turbine is flipped over and placed on the lifting platform with the turbine guide facing down. It is then secured. A sling, a hand chain hoist, and a crane are connected to the front casing adapter plate so that the sling is slightly stressed. S3, Disassemble the low-pressure casing; Remove the front and rear flanges and connecting parts of the split face of the low-pressure casing, and use a mobile small crane to remove the two halves of the low-pressure casing in sequence. S4, Install the rotor auxiliary support plate; Install a rotor auxiliary support plate at the rear flange of the rotatable casing; S5, Install the low-pressure component limit block; Install a low-pressure section limit block on the inlet flange of the transition section; S6, disassemble the bolt; Remove the connecting bolts at the rear journal of the low-pressure rotor; S7, disconnect the low-voltage component; Using a hydraulic jack and a special jacking tool, which includes a jacking rod, a process nut, and a positioning sleeve, the jacking rod is hoisted onto the sleeve nut using a lifting ring. The positioning sleeve is installed at the front end of the jacking rod, and the inner wall of the rotor is used to center the jacking rod. The original low-pressure front nut of the unit is replaced with a process nut. The jack is connected using the threaded hole on the process nut. The jack handle is slowly and evenly pressed down to disengage the low-pressure assembly. The low-pressure assembly is flipped so that the front casing faces down and is secured to the assembly base. Subsequent normal disassembly is then possible. S8, cut sleeve nut; S9, install the transition section adapter plate; A transition section adapter plate is installed at the front end of the transition section casing. This transition section adapter plate includes a chassis and a bracket, which also serves to fix the rear journal of the low-pressure rotor after flipping to prevent it from falling off. After flipping the high-pressure assembly with the transition section facing down, the low-pressure rotor can be pulled out for subsequent normal disassembly.

2. The method for disassembling a gas turbine bushing nut according to claim 1, characterized in that, Specifically, S8 involves cutting the sleeve nut using an angle grinder and a wind grinder.

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