CN-119703218-B - Method for disassembling sleeve nut of gas turbine

CN119703218BCN 119703218 BCN119703218 BCN 119703218BCN-119703218-B

Abstract

The invention provides a method for disassembling a sleeve shaft nut of a gas turbine, which comprises the steps of S1, installing a low-vortex rotor supporting disc, S2, installing a front casing lifting disc, S3, decomposing a low-pressure casing, S4, installing a rotor auxiliary supporting plate, S5, installing a low-pressure part sleeve limiting block, S6, decomposing bolts, S7, decomposing and disconnecting a low-pressure assembly, S8, cutting the sleeve shaft nut, and S9, installing a transition section switching disc. According to the invention, the low-pressure box is removed under the vertical state that the front casing of the unit faces upwards, the connecting piece of the rear shaft neck of the low-pressure rotor is removed, the whole low-pressure part is separated from the unit, the sleeve nut is exposed from the deep part of the rotor, the operable space is enlarged, the stability is increased, and the other components are not damaged, so that the normal maintenance and inspection of the gas turbine are ensured.

Inventors

CUI HANWEN
Dai Pengyang
CUI BIN
LIU GUOQING
LI HONGCHEN
Liang Depeng
CHEN HONGGUANG
FAN TINGYU

Assignees

中船重工龙江广瀚燃气轮机有限公司

Dates

Publication Date: 20260508
Application Date: 20241118

Claims (2)

1. A method of disassembling a sleeve nut for a gas turbine, the sleeve nut for connecting a low pressure gas rotor to a low pressure turbine rotor, comprising the steps of: s1, mounting a low-vortex rotor supporting disc; hoisting a front casing of the gas generator downwards to a lifting platform, disassembling a connecting piece of a turbine first guide and a low vortex supporting ring, disassembling the low vortex supporting ring, installing a low vortex rotor supporting disc on a turbine first guide rear flange, wherein the low vortex rotor supporting disc comprises a chassis, a connecting sleeve and a bracket, and screwing the connecting sleeve into a rear internal thread of the low vortex rotor; S2, installing a front case hoisting disc; The gas turbine is turned over, the turbine I is downwards placed on the lifting platform, the gas turbine I is fastened, and a hanging strip, a chain block and a crane are connected at the front casing adapter plate, so that the hanging strip is slightly stressed; s3, decomposing the low-pressure box; Removing the connecting pieces of the front flange, the rear flange and the middle split surface of the low-pressure box, and sequentially removing two half machine boxes of the low-pressure box by using a movable small crane; s4, installing a rotor auxiliary supporting plate; a rotor auxiliary supporting plate is arranged at a rear flange of the rotatable casing; S5, installing a low-pressure part sleeve limiting block; a low-pressure part sleeve limiting block is arranged on an air inlet flange of the transition section; S6, disassembling the bolts; Removing the connecting bolt at the rear shaft neck of the low-pressure rotor; s7, decomposing and disengaging the low-voltage assembly; The hydraulic jack and the special jack are utilized, the special jack comprises a push rod, a process nut and a positioning sleeve, the push rod is hoisted to the sleeve shaft nut by using a lifting ring, the positioning sleeve is arranged at the front end of the push rod, the inner wall of a rotor is utilized to center the push rod, the low-pressure front nut of an original unit is replaced by the process nut, the jack is connected by utilizing a threaded hole on the process nut, the handle of the jack is slowly and uniformly pressed downwards, the low-pressure assembly is disconnected, the front casing of the low-pressure assembly is turned downwards to be fastened to the assembly base, and then the low-pressure assembly is normally decomposed; S8, cutting a sleeve shaft nut; s9, installing a transition section switching disc; The transition section changeover panel is installed to changeover portion receiver front end, and this changeover portion changeover panel includes chassis and support, compromise the fixed of low pressure rotor back journal after the upset, prevent to drop, upset high-pressure assembly, changeover portion is down, pulls out low vortex rotor, follow-up normal decomposition.
2. The method for disassembling a sleeve nut of a gas turbine according to claim 1, wherein the step S8 is to cut the sleeve nut by an angle grinder or a stylus pen.

Description

Method for disassembling sleeve nut of gas turbine Technical Field The invention belongs to the field of gas turbine assembly, and particularly relates to a disassembly method of a sleeve shaft nut of a gas turbine. Background The sleeve nut is used as a key component for connecting the low-pressure air rotor and the low-pressure turbine rotor of the gas turbine, the installation position of the sleeve nut is 2000mm away from the end part of the rotor at the inner cavity of the low-pressure air compressor rotor, the conventional disassembly method is to use an lengthened spanner to be matched with a labor-saving device for disassembly, but the working environment of the gas turbine is bad, if the threads are damaged and blocked, the lengthened spanner cannot be used for disassembly, and the normal disassembly and inspection work of the gas turbine can be greatly influenced. In the past, the situation that the sleeve nut cannot be normally disassembled due to thread damage is caused, a lengthened cutting tool is often adopted to cut the sleeve nut, but the installation position of the sleeve nut is affected, a cutting tool extension rod is about 2000mm long, accurate control is extremely difficult, and once shaking occurs, the cutting tool can damage internal parts of a rotor to cause irrecoverable loss. Disclosure of Invention The invention aims to provide a disassembly method for a sleeve nut of a gas turbine, which can finish the disassembly of the sleeve nut under the condition of ensuring that other parts are not damaged. The disassembly method of the sleeve nut of the gas turbine comprises the following steps: s1, mounting a low-vortex rotor supporting disc; S2, installing a front case hoisting disc; s3, decomposing the low-pressure box; s4, installing a rotor auxiliary supporting plate; S5, installing a low-pressure part sleeve limiting block; S6, disassembling the bolts; s7, decomposing and disengaging the low-voltage assembly; S8, cutting a sleeve shaft nut; s9, installing a transition section switching disc. Further, S1 is specifically that a front casing of the gas generator is hoisted downwards to a lifting platform, a connecting piece of a first turbine guide and a low vortex supporting ring is detached, the low vortex supporting ring is detached, a low vortex rotor supporting disc is installed on a flange behind the first turbine guide, and a connecting sleeve is used for screwing into internal threads behind the low vortex rotor. Further, the S2 is specifically that the turnover combustion engine is provided with a low-vortex supporting ring which is downwards placed on a lifting platform and is fastened, and a hanging strip, a chain block and a crane are connected at a front casing adapter plate, so that the hanging strip is slightly stressed. And S3, removing the front flange, the rear flange and the connecting piece of the split surface of the low-pressure casing, and sequentially removing the two half casings of the low-pressure casing by using a movable small crane. Further, the S4 specifically comprises the step of installing a rotor auxiliary supporting plate at a rear flange of the rotatable casing. Further, S5 is specifically that a limiting block is installed on an air inlet flange of the transition section. Further, S6 is specifically to remove the connecting bolt at the rear journal of the low-pressure rotor. And S7, the hydraulic jack and the special jacking tool are used for disconnecting the low-voltage assembly, the casing is fastened downwards to the assembly base before the low-voltage assembly is turned over, and then the casing is normally disassembled. Further, the step S8 is specifically to cut the sleeve nut through an angle grinder and a wind mill pen. Further, the S9 specifically comprises the steps that a transition section switching disc is arranged at the front end of a transition section, the fixing of a rear shaft neck of the low-pressure rotor after overturning is considered, falling off is prevented, a high-pressure assembly is overturned, the transition section faces downwards, the low-vortex rotor is pulled out, and then normal decomposition is carried out. The invention has the beneficial effects that: (1) The invention provides a disassembly scheme for disassembling the sleeve nut with damaged threads. The problem that the sleeve nut cannot be disassembled by using the lengthened wrench is solved, the purpose that other parts are not damaged to finish the disassembly of the sleeve nut is achieved, and therefore the disassembly and inspection task of the gas turbine is finished. (2) The low-pressure casing and the low-pressure rotor are disconnected, and the sleeve nut is exposed to the outside, so that the operable space is enlarged. (3) The cutting tool can cut the sleeve nut at a short distance, so that the stability is improved, and the risk of damaging other parts is reduced. (4) The decomposition mode conforms to the decomposition requirement of the com