Low position vane holder ring disassembly and assembly device and associated method

Abstract

Disclosed are a low-position static vane holder ring disassembly and assembly device, a low-position static vane holder ring disassembly method, and a low-position static vane holder ring assembly method. The device includes a rotating jig installed on a low-position static vane holder ring installed inside a low-position turbine housing, a bolt member penetrating a contact portion of the rotating jig and the low-position static vane holder ring, and a protruding member installed adjacent to the bolt member to prevent the bolt member from being detached.

Description

Technical Field

[0001] This invention discloses an apparatus and method for removing a lower vane carrier from a lower turbine housing and reassembling the removed lower vane carrier back onto the lower turbine housing. Background Technology

[0002] A turbomachinery is a device that generates power for electricity by passing a fluid (especially gas) through it. Therefore, turbomachinery is often installed and used in conjunction with a generator. Gas turbines, steam turbines, and wind power turbines are examples of turbomachinery. A gas turbine is a device that mixes compressed air with natural gas, combusts it to produce gas, and uses this gas to generate power for electricity generation. A steam turbine is a device that heats water to produce steam and uses this steam to generate power for electricity generation. A wind turbine is a device that converts wind power into electricity for power generation.

[0003] The following describes a gas turbine in a turbomachinery system. A gas turbine comprises a compressor, a combustion chamber, and a turbine. The compressor has multiple stationary and moving blades arranged alternately within its casing. The compressor draws in external air through a compressor inlet scroll strut. This air is compressed by the stationary and moving blades as it passes through the compressor. The combustion chamber receives the compressed air and mixes it with fuel. The combustion chamber then uses an igniter to ignite the fuel-air mixture, generating high-temperature, high-pressure combustion gas. This generated combustion gas is supplied to the turbine. The turbine has multiple stationary and moving blades arranged alternately within its casing. The turbine receives the combustion gas generated in the combustion chamber and passes it through its interior. The combustion gas passing through the turbine drives the moving blades to rotate, and the gas that has completely passed through the turbine is discharged to the outside through the turbine diffuser.

[0004] The following describes a steam turbine in turbomachinery. A steam turbine consists of an evaporator and a turbine. The evaporator heats water from the outside to generate steam. Like the turbine in a gas turbine, the turbine has a plurality of stationary and moving blades alternately arranged inside its casing. However, instead of allowing gas to pass through, the steam generated by the evaporator passes through the turbine in a steam turbine, driving the moving blades to rotate.

[0005] Gas turbines and steam turbines both include a turbine. The turbine includes a turbine rotor and a turbine stator. The turbine stator includes a turbine housing, a stator ring mounted on the inner circumferential surface of the turbine housing, and a plurality of turbine stator blades mounted on the inner circumferential surface of the stator ring and arranged along the circumferential direction of the stator ring. The stator ring and the plurality of turbine stator blades coupled to the stator ring are arranged in a multi-stage manner along the axial direction of the turbine housing. Furthermore, the turbine housing includes an upper turbine housing and a lower turbine housing, defined vertically by a horizontal plane passing through its center. The stator ring includes an upper stator ring and a lower stator ring, each mounted to the upper and lower turbine housings, respectively. The plurality of turbine stator blades also includes a plurality of upper turbine stator blades mounted on the upper stator ring and a plurality of lower turbine stator blades mounted on the lower stator ring.

[0006] When the stationary blade retainer ring of a specific stage needs repair or replacement due to damage or other reasons, it is necessary to remove the stationary blade retainer ring of that specific stage from the turbine housing. High-level stationary blade retainers can be accessed and handled by personnel simply by removing the high-level turbine housing. However, even after removing the high-level turbine housing and then the high-level stationary blade retainer ring of the stage, it is more difficult to access the low-level stationary blade retainer ring of that stage due to the presence of high-level stationary blade retainers from other stages.

[0007] To remove the low-level stationary blade retainer ring from the low-level turbine housing, the following apparatus and method are used: after installing a rotating jig onto the low-level stationary blade retainer ring of the target stage, the rotating jig and the low-level stationary blade retainer ring are rotated together as a whole to install the rotating jig onto the low-level turbine housing and to move the low-level stationary blade retainer ring to the upper side of the low-level turbine housing. However, this existing low-level stationary blade retainer ring disassembly and assembly device, in addition to using too many parts and performing too much machining, causes various parts present on the disassembly and assembly device to fall off when the rotating jig and the low-level stationary blade retainer ring are rotated together as a whole.

[0008] [Existing Technical Documents]

[0009] [Patent Documents]

[0010] U.S. Patent Publication No. 1016 / 0222829 (Invention Title: Rotating device for a gasturbine and method for rotating a component) Summary of the Invention

[0011] [Technical challenges solved]

[0012] The present invention aims to solve the aforementioned problems. The purpose of the present invention is to provide a device for disassembling and assembling a low-position stationary blade retainer ring and a method for disassembling and assembling a low-position stationary blade retainer ring using the device. The device requires fewer parts and additional processing to remove the low-position stationary blade retainer ring from the low-position turbine housing and can prevent parts from falling off during the disassembly of the low-position turbine housing.

[0013] [Technical Solution to the Problem]

[0014] This invention discloses a device for disassembling and assembling a low-position stationary blade retainer ring. It includes: a rotating jig, which is mounted onto a low-position stationary blade retainer ring installed inside the low-position turbine housing; a bolt, which penetrates the contact area between the rotating jig and the low-position stationary blade retainer ring; and a protrusion, mounted adjacent to the bolt to prevent the bolt from detaching.

[0015] The bolt member includes: a shank that passes through the low-position stationary blade retaining ring and the rotating fixture; a head that is connected to one end of the shank and has a diameter larger than the shank; and a protrusion that can be disposed on the head side of the bolt member.

[0016] The head is disposed on the rotating fixture side, and the rod can pass through from the rotating fixture side to the low stationary blade holding ring side.

[0017] The rod portion includes: a first rod portion, one end of which is connected to the head, and a thread is formed on its outer circumferential surface; a second rod portion, which is connected to the other end of the first rod portion; the low-position stationary blade retaining ring can be threaded at the insertion point of the rod portion to be fastened to the thread of the first rod portion.

[0018] The diameter of the second rod can be formed to be smaller than that of the first rod.

[0019] Based on a virtual axis direction passing through the center between the low-position stationary blade holding ring and the rotating fixture, the protrusion may include: a pair of side protrusions disposed isolated from the head along the axis direction; and a connecting protrusion connecting the pair of side protrusions between the pair of side protrusions.

[0020] The vertical length of the pair of side protrusions is longer than that of the head, and the connecting protrusions can be configured to be isolated from the head.

[0021] The bolt may also include a protrusion connected to the other end of the shank, formed in the shape of a prism, on which a wrench for rotating the bolt is mounted.

[0022] The protrusion is formed in a hollow shape and may have internal threads to allow an eye bolt to be inserted and tightened. The eye bolt is used to pull the bolt toward the lower stationary blade holding ring side.

[0023] Based on a virtual axis passing through the center between the low-position stationary blade holding ring and the rotating fixture, the low-position stationary blade holding ring includes: a first holding ring member and a second holding ring member, which are isolated from each other along the axis; a holding ring body connecting the first holding ring member and the second holding ring member; the rotating fixture may include: a first fixture member connected to the first holding ring member; a second fixture member, which is isolated from the first fixture member along the axis and connected to the second holding ring member; and a plurality of fixture connecting portions connecting the first fixture member and the second fixture member, which are isolated along the circumferential direction of the first fixture member.

[0024] The low-position turbine housing has a slot formed on its inner circumferential surface. The diameter of the first holding ring is larger than that of the holding ring body. When the first holding ring is inserted into the slot, the rotating fixture and the low-position stationary blade holding ring rotate together as a whole around the central axis in the axial direction. At this time, the first holding ring disengages from the slot, and the first fixture can be inserted into the slot.

[0025] The low-position stationary blade holding ring also includes a holding ring flange, which is disposed between the first holding ring member and the second holding ring member, disposed on the outer side of the holding ring body in the radial direction, and disposed on the side of the rotating fixture, allowing the bolt member to pass through. The rotating fixture may also include a fixture flange, which is disposed between the first fixture member and the second fixture member, and disposed in contact with the holding ring flange, allowing the protrusion to be mounted on it.

[0026] The fixture connection may include: a connection body disposed between the first fixture and the second fixture; a winding protrusion protruding from the connection body along the circumferential direction of the first fixture, on which a rope for driving the rotating fixture to rotate is wound.

[0027] The connecting part body can form a through hole for fastening the eye bolt on the outer surface with the radius direction of the rotating fixture as a reference, and the rope passes through the eye bolt.

[0028] The low-position turbine housing has a protruding sill formed from the inner circumferential surface in the radial direction. The diameter of the second holding ring is smaller than that of the first holding ring, and it is configured opposite to the protruding sill. The diameter of the second fixture is smaller than that of the first fixture. When the second holding ring and the protruding sill are configured opposite to each other, and the rotating fixture and the low-position stationary blade holding ring rotate together as a whole around the central axis in the axial direction, the second holding ring disengages from the protruding sill, and the second fixture can be configured opposite to the protruding sill.

[0029] The low-position turbine housing has a slot formed on its inner circumferential surface. A protruding sill is formed at a position isolated from the slot along the axial direction. The retaining ring flange protrudes further outward in the radial direction than the second retaining ring and is disposed between the slot and the protruding sill. The fixture flange protrudes further outward in the radial direction than the second fixture. When the retaining ring flange is disposed between the protruding sill and the slot, and the rotating fixture and the low-position stationary blade retaining ring rotate together as a whole about the axial direction as the central axis, the retaining ring flange disengages from the low-position stationary blade retaining ring, and the fixture flange can be disposed between the protruding sill and the slot.

[0030] This invention discloses a method for disassembling a low-position stationary blade retainer ring, comprising the following steps: Step A, preparing a low-position stationary blade retainer ring disassembly and assembly device, the device comprising: a rotating jig, which is installed onto the low-position stationary blade retainer ring installed inside the low-position turbine housing; a bolt, which penetrates at the contact point between the rotating jig and the low-position stationary blade retainer ring; and a protrusion, which is installed adjacent to the bolt to prevent the bolt from detaching; Step B, removing the high-position turbine housing from the low-position turbine housing, removing the high-position stationary blade retainer ring and the high-position turbine stationary blade installed thereon from the low-position stationary blade retainer ring, and then loading the rotating jig onto the low-position stationary blade. Step C: Hold the ring; Step D: Allow the bolt to pass through the contact area between the rotating fixture and the low-position stationary blade holder; Step E: Install the protrusion adjacent to the bolt; Step E: Using the virtual axis direction passing through the center between the low-position stationary blade holder and the rotating fixture as a reference, rotate the low-position stationary blade holder and the rotating fixture as a whole, so that the low-position stationary blade holder is disengaged from the low-position turbine housing while the rotating fixture is positioned on the low-position turbine housing; and Step F: Remove the low-position stationary blade holder, which was configured on the upper side of the rotating fixture in step E, from the rotating fixture.

[0031] In step F, after rotating the bolt downwards to disengage the thread of the bolt from the thread of the low-position stationary blade retainer, the low-position stationary blade retainer can be pulled upwards and removed from the rotating fixture.

[0032] This invention discloses a method for assembling a low-position stationary blade retainer ring, comprising the following steps: Step A, preparing a device for disassembling and assembling the low-position stationary blade retainer ring, the device comprising: a rotating jig, which is installed onto the low-position stationary blade retainer ring installed inside the low-position turbine housing; a bolt, which penetrates the contact area between the rotating jig and the low-position stationary blade retainer ring; and a protrusion, which is installed adjacent to the bolt to prevent the bolt from detaching; Step B, with the rotating jig located on the low-position turbine housing and the bolt and protrusion installed on the rotating jig, simultaneously placing the low-position stationary blade retainer ring from the upper side of the rotating jig onto the rotating jig, and simultaneously removing the bolt. Step C: Pull the bolt upwards and rotate it so that the thread of the bolt is tightened into the thread of the low-position stationary blade retaining ring; Step D: Using the virtual axis direction passing through the center between the low-position stationary blade retaining ring and the rotating fixture as a reference, rotate the low-position stationary blade retaining ring and the rotating fixture as a whole, so that the rotating fixture is detached from the low-position turbine housing, and install the low-position stationary blade retaining ring onto the low-position turbine housing; and Step E: After removing the protrusion and bolt from the rotating fixture and the low-position stationary blade retaining ring, remove the rotating fixture from the low-position stationary blade retaining ring.

[0033] In step C, after tightening the eye bolt into the thread inside the protrusion and pulling the eye bolt upward to raise the bolt, a wrench is installed on the outer circumferential surface of the protrusion and rotated to tighten the thread of the first rod and the thread of the low stationary blade retaining ring.

[0034] [Beneficial Effects]

[0035] According to the present invention, the low-position stationary blade retaining ring disassembly and assembly device and the method for disassembling and assembling the low-position stationary blade retaining ring using the device, the bolt penetrates through the contact portion between the rotating jig and the low-position stationary blade retaining ring, and the protrusion is installed adjacent to the bolt and wrapped around the bolt. When the low-position stationary blade retaining ring is removed from the rotating jig after the rotating jig and the low-position stationary blade retaining ring are rotated, the bolt can be prevented from falling and dropping onto the low-position turbine housing.

[0036] Furthermore, according to the present invention, the low-position stationary blade retaining ring disassembly and assembly device is designed to include a rotating jig, bolts and protrusions. Therefore, it can not only reduce the number of parts compared with the prior art, but also assemble the low-position stationary blade retaining ring to the low-position turbine housing or remove it without additional processing. Attached Figure Description

[0037] Figure 1 This is a cross-sectional view of a gas turbine.

[0038] Figure 2This is a perspective view showing a low-position stationary blade retainer assembly / disassembly device installed on the low-position stationary blade retainer with the retainer mounted to the low-position turbine housing.

[0039] Figure 3 yes Figure 2 An enlarged view of part A shown.

[0040] Figure 4 yes Figure 2 The diagram shows a three-dimensional view of the disassembly and assembly device for the low-position stationary blade retaining ring and the low-position stationary blade retaining ring.

[0041] Figure 5 yes Figure 4 An enlarged view of section B shown.

[0042] Figure 6 yes Figure 5 A three-dimensional view of the bolt component shown.

[0043] Figure 7 yes Figure 6 Enlarged view of the protrusion shown.

[0044] Figure 8 yes Figure 4 An enlarged view of the upper part of the rotating fixture shown.

[0045] Figure 9 The diagram illustrates a situation where the rotating fixture and the low-position stationary blade holding ring rotate about the central axis, causing the rotating fixture and the low-position stationary blade holding ring to flip up and down.

[0046] Figure 10 It shows Figure 9 The situation where the thread of the middle bolt part moves downward after separating from the thread of the lower stationary blade retaining ring. Detailed Implementation

[0047] The present invention has been described with reference to the illustrated embodiments, but these are merely illustrative. Those skilled in the art will recognize that various modifications and equivalent embodiments can be implemented from them. Therefore, the true scope of protection of the present invention should be defined in accordance with the spirit of the claims.

[0048] The present invention will now be described in conjunction with the accompanying drawings. In this description, it is assumed that the turbine machinery to which the low-position stationary blade retaining ring disassembly and assembly device and method of the present invention are applicable is a gas turbine; however, this is merely an example. Naturally, the turbine machinery to which the low-position stationary blade retaining ring disassembly and assembly device and method of the present invention are applicable may also be a steam turbine rather than a gas turbine.

[0049] Please see Figure 1The gas turbine 10 includes a compressor 11, a combustion chamber 12, and a turbine 13. With the direction of gas (compressed air or gas) flow as a reference, the compressor 11 is located upstream of the gas turbine 10, while the turbine 13 is located downstream. Furthermore, the combustion chamber 12 is located between the compressor 11 and the turbine 13.

[0050] Compressor 11 houses compressor stator blades and compressor rotor inside its casing, while turbine 13 houses turbine stator blades 40 and 41 and turbine rotor 14 inside its casings 20 and 21. The compressor stator blades and compressor rotor are arranged in a multi-stage configuration along the direction of compressed air flow, and the turbine stator blades 40 and 41 and turbine rotor 14 are also arranged in a multi-stage configuration along the direction of combustion gas flow. In this design, the internal space of compressor 11 narrows towards the rear stage to compress the intake air, while conversely, the internal space of turbine 13 widens towards the rear stage to allow the combustion gas supplied to the combustion chamber to expand.

[0051] On the other hand, a torque tube is arranged between the compressor rotor located on the last stage side of the compressor 11 and the turbine rotor 14 located on the first stage side of the turbine 13. This torque tube acts as a torque transfer element, transmitting the rotational torque generated on the turbine 13 to the compressor 11. The torque tube is as follows: Figure 1 The torque tube shown can be constructed from a plurality of torque tube discs consisting of 3 stages, but it is only one of many embodiments of the present invention. The torque tube can also be constructed from a plurality of torque tube discs consisting of 4 or more stages or 2 or fewer stages.

[0052] The compressor rotor includes compressor discs and compressor moving blades. The compressor housing contains a plurality of (e.g., 14) compressor discs, which are axially secured without isolation by tie rods. More specifically, the compressor discs are aligned axially with their centers penetrated by the tie rods. Furthermore, adjacent compressor discs are not rotatably configured because their opposing surfaces are pressed together by the tie rods.

[0053] A plurality of compressor moving blades are radially coupled to the outer circumferential surface of the compressor disk. Furthermore, each of these compressor moving blades is equipped with a plurality of compressor stationary blades, which are annularly mounted to the inner circumferential surface of the compressor housing, based on the same stage. Unlike the compressor disk, the compressor stationary blades remain stationary and do not rotate, aligning the flow of compressed air through the compressor moving blades and guiding the compressed air to the downstream compressor moving blades. In this case, the compressor housing and compressor stationary blades can be defined using the general term "compressor stator" to distinguish them from the compressor rotor.

[0054] The tie rod is configured to pass through the center of the plurality of compressor disks and the turbine disk (described later), with one end fastened to the compressor disk located at the frontmost stage of the compressor and the other end fastened by a retaining nut.

[0055] The shape of the tie rod can be realized in various structures depending on the gas turbine, therefore it is not limited to... Figure 1 The configuration shown can be as follows: a single connecting rod passing through the center of the compressor disk and the turbine disk, or multiple connecting rods arranged in a circle, or a combination thereof.

[0056] Although not illustrated, a deswirler can be installed in the compressor of a gas turbine. This deswirler functions as a guide vane to align the flow angle of the fluid entering the combustion chamber inlet after the fluid pressure is increased to the design flow angle.

[0057] The combustion chamber 12 mixes and burns the incoming compressed air and fuel to produce high-energy, high-temperature, and high-pressure gas. Through the isobaric combustion process, the temperature of the gas is raised to the heat resistance limit that the combustion chamber and turbine components can withstand.

[0058] Multiple combustion chambers constituting the combustion system of the gas turbine 10 can be arranged inside the combustion chamber shell, which is formed in the shape of a cell. These include fuel injection nozzles, flame tubes (liners) forming the combustion chamber, and transition pieces that serve as the connection between the combustion chamber and the turbine.

[0059] Specifically, the flame tube provides a combustion space where fuel injected by the fuel nozzle mixes with compressed air from the compressor and then burns. The flame tube comprises: a combustion chamber that provides the combustion space for the fuel mixed with air to burn; and an annular flow path that surrounds the combustion chamber to form an annular space. Furthermore, the front end of the flame tube is integrated with a fuel injection nozzle, and the sidewalls are integrated with an igniter.

[0060] The annular flow path of the flame tube allows compressed air flowing through multiple holes (Hole) on the outer wall of the flame tube to flow within it, and compressed air cooled in the transition section described later also flows through it. As mentioned earlier, the compressed air flows along the outer wall of the flame tube to prevent thermal damage to the flame tube caused by the heat generated by fuel combustion in the combustion chamber.

[0061] The rear end of the flame tube is connected to a transition section to deliver the combustion gases, which are burned by the spark plug, to the turbine side. Similar to the flame tube, the transition section forms an annular flow path that encloses the internal space of the transition section. Compressed air flowing along the annular flow path cools the outer wall to prevent damage caused by the high temperature of the combustion gases.

[0062] On the other hand, the high-temperature, high-pressure gas exiting the combustion chamber 12 is supplied to the aforementioned turbine 13. The high-temperature, high-pressure gas supplied to the turbine 13 expands as it passes through the turbine 13, thereby applying impact and reaction force to the turbine's moving blades (described later) to generate rotational torque. This rotational torque is then transmitted to the compressor via the aforementioned torque tube; any power exceeding the power required to drive the compressor is used to drive a generator, etc.

[0063] The structure of the turbine 13 is substantially similar to that of the compressor 11. That is, the turbine 13 also has a plurality of turbine rotors 14 similar to the compressor rotor of the compressor 11. Therefore, each turbine rotor 14 also includes a turbine disk and a plurality of turbine moving blades arranged radially therefrom. Between the turbine moving blades are also a plurality of turbine stationary blades 40, 41, which, based on the same stage, are annularly mounted to the turbine housings 20, 21. These turbine stationary blades 40, 41 guide the flow direction of the combustion gas passing through the turbine moving blades. In this case, the turbine housings 20, 21 and the turbine stationary blades 40, 41 can also be defined by the general name "turbine stator 15" to distinguish them from the turbine rotors 14.

[0064] The turbine stator 15 includes: turbine housings 20 and 21; blade retaining rings 30 and 31 mounted on the inner circumferential surfaces of the turbine housings 20 and 21; and a plurality of turbine blades 40 and 41 mounted on the inner circumferential surfaces of the blade retaining rings 30 and 31, arranged along the circumferential direction of the blade retaining rings 30 and 31. The blade retaining rings 30 and 31 and the plurality of turbine blades 40 and 41 coupled thereto are arranged in a multi-stage manner along the axial direction of the turbine housings 20 and 21. Furthermore, the turbine housings 20 and 21 include an upper turbine housing 20 and a lower turbine housing 21, which are distinguished vertically by a horizontal plane passing through the center, and the blade retaining rings 30 and 31 include a higher blade retaining ring 30 and a lower blade retaining ring 31, respectively mounted on the upper turbine housing 20 and the lower turbine housing 21. Of course, the plurality of turbine stationary blades 40, 41 also include a plurality of high-position turbine stationary blades 40 installed on the high-position stationary blade holding ring 30 and a plurality of low-position turbine stationary blades 41 installed on the low-position stationary blade holding ring 31.

[0065] Please see Figures 2 to 10 The low-position stationary blade retaining ring disassembly and assembly device (hereinafter referred to as the "disassembly and assembly device") 100 of the present invention includes a rotating jig 110, a bolt member 120, and a protrusion 130. The rotating jig 110 is mounted on the low-position stationary blade retaining ring 31. The bolt member 120 passes through the contact portion between the rotating jig 110 and the low-position stationary blade retaining ring 31. The protrusion 130 is mounted adjacent to the bolt member 120 to prevent the bolt member 120 from detaching.

[0066] The axial direction described below is defined as passing through the center of the gas turbine 10. This axial direction passes through the center of the low-position stationary blade retaining ring 31 and the rotating fixture 110, and is also the length direction of the tie rod. In this case, the flow direction of the gas flowing inside the turbine 13 can be considered a part of this axial direction. Below, the upstream side is defined as the front, and the downstream side is defined as the rear, based on the gas flow direction. On the other hand, the circumferential and radial directions described below are defined as the circumferential and radial directions of the turbine housings 20 and 21. However, these circumferential or radial directions are also the circumferential and radial directions of the stationary blade retaining rings 30 and 31 or the rotating fixture 110.

[0067] Please see Figure 3The low-mounted turbine housing 21 has a slot 22 and a protruding sill 23 formed on its inner circumferential surface. The slot 22 is formed in a ring shape extending in the circumferential direction. The protruding sill 23 is formed protruding radially inward from the inner circumferential surface of the low-mounted turbine housing 21 at a position that isolates it from the slot 22.

[0068] Please see Figures 2 to 5 The low-position stationary blade retaining ring 31 includes a first retaining ring member 32, a second retaining ring member 33, a retaining ring body 34, and a retaining ring flange 35. The first retaining ring member 32 is formed in a semi-circular ring shape. The second retaining ring member 33 is formed in a semi-circular ring shape and is disposed forward, spaced apart from the first retaining ring member 32, with a diameter (more specifically, outer diameter) smaller than that of the first retaining ring member 32. The retaining ring body 34 is formed in a semi-circular ring shape and connects the first retaining ring member 32 and the second retaining ring member 33. The retaining ring flange 35 is disposed between the first retaining ring member 32 and the second retaining ring member 33, located radially outward of the retaining ring body 34, on the side of the rotating fixture 110, through which the bolt member 120 passes.

[0069] Please see Figures 2 to 5 The rotary fixture 110 includes a first fixture member 111, a second fixture member 112, a fixture connecting portion 113, and a fixture flange 117. The first fixture member 111 is formed in a semi-circular ring shape and is connected to the first holding ring member 32. The second fixture member 112 is formed in a semi-circular ring shape and is disposed forward, spaced apart from the first fixture member 111, and is connected to the second holding ring member 33. The second fixture member 112 is formed with a diameter (more specifically, outer diameter) smaller than that of the first fixture member 111. The fixture connecting portion 113 connects the first fixture member 111 and the second fixture member 112, and a plurality of fixture connecting portions 113 are arranged in a spaced manner along the circumferential direction. The fixture flange 117 is disposed between the first fixture 111 and the second fixture 112, on the side of the low stationary blade holding ring 31, and is grounded to the holding ring flange 35, and the protrusion 130 is installed thereon.

[0070] Please see Figure 8The fixture connecting portion 113 includes a connecting portion body 114 and a winding protrusion 116. The connecting portion body 114 is disposed between the first fixture member 111 and the second fixture member 112, aligned along the axial direction, and connects the first fixture member 111 and the second fixture member 112. The winding protrusion 116 protrudes from the connecting portion body 114 along the circumferential direction, and the rope for driving the rotating fixture 110 to rotate is wound around it. The connecting portion body 114 has a fixture through hole 115 for fastening a lifting eye bolt (not shown) on its outer side in the radial direction, and the rope passes through the lifting eye bolt. When the disassembly and assembly device 100 is fully loaded onto the low-position stationary blade holding ring 31, the lifting eye bolt is inserted into the fixture through hole 115, and the rope passing through the lifting eye bolt is wound around the winding protrusion 116. Moreover, the external force causes the coiling protrusion 116 to pull the rotating fixture 110 along the circumferential direction and rotate it. Therefore, the rotating fixture 110 and the low stationary blade holding ring 31 rotate together as a whole around the axial direction as the central axis.

[0071] Please see Figures 5 to 7 The bolt member 120 includes a shank 121, a head 125, and a protrusion 126. The shank 121 passes through the low-position stationary blade retaining ring 31 and the rotating fixture 110. The head 125 is connected to one end of the shank 121 and is formed with a diameter larger than that of the shank 121. The protrusion 126 is connected to the other end of the shank 121 and is formed in the shape of a prism, on which a wrench (not shown) for rotating the bolt member 120 is mounted.

[0072] Please see Figure 6The head 125 is disposed on the side of the rotating jig 110, and the rod 121 extends from the rotating jig 110 side toward the side of the low-position stationary blade retaining ring 31. Furthermore, the protrusion 130 is disposed on the side of the head 125 of the bolt member 120. The rod 121 includes a first rod 122 and a second rod 124. One end of the first rod 122 is connected to the head 125, and its outer circumferential surface is threaded 123. The second rod 124 is connected to the other end of the first rod 122. The retaining ring flange 35 has a through hole (not shown) for inserting the rod 121, and the inner wall of the through hole has a thread (not shown) that fastens to the thread 123 of the first rod 121. The diameter of the second rod 124 is smaller than that of the first rod 122. When the rod portion 121 is inserted into the through hole of the retaining flange, the second rod portion 124 is inserted into the through hole first, followed by the first rod portion 122. The reason for making the diameter of the second rod portion 124 smaller than that of the first rod portion 122 is to avoid the second rod portion 124 being tightened or stuck by the threads of the through hole. After the rod portion 121 is fully inserted into the retaining flange 35, the head 125 is placed onto the fixture flange 117.

[0073] Please see Figure 7 The protrusion 126 is hollow in shape and has internal threads 127 to allow an eye bolt (not shown) to be inserted and tightened. This eye bolt is used to pull the bolt 120 toward the lower stationary blade retaining ring 31. Figure 2 and Figure 5 As shown, the disassembly and assembly device 100 is fully loaded onto the low-position stationary blade retaining ring 31, as... Figure 9 As shown, after the rotating fixture 110 and the low-position stationary vane retaining ring 31 are rotated together as a whole, the low-position stationary vane retaining ring 31 is pulled upward and disengaged from the rotating fixture 110. Subsequently, if it is necessary to reassemble the low-position stationary vane retaining ring 31 onto the rotating fixture 110, the rod portion 121 is inserted through the retaining ring flange 35 while the low-position stationary vane retaining ring 31 is placed onto the rotating fixture 110. In this case, the operator loads the eye bolt onto the thread 127 of the protrusion 126 and pulls the bolt member 120 upward, then removes the eye bolt from the protrusion 126 and engages a wrench on the outer circumference of the protrusion 126. Then, in this state, the protrusion 126 is rotated using the wrench. In this case, the bolt member 120 rotates, and the thread 123 of the first rod portion 122 is tightened onto the thread of the retaining ring flange 35. Afterwards, if the low-position stationary blade holding ring 31 and the rotating fixture 110 are rotated again, the low-position stationary blade holding ring 31 will be installed on the low-position turbine housing 21 and the rotating fixture 110 will be repositioned on the upper side of the low-position turbine housing 21.

[0074] Please see Figure 3 and Figure 5 The protrusion 130 includes a pair of side protrusions 131 and a connecting protrusion 132. The pair of side protrusions 131 are disposed separately from the head 125 along the axial direction. The connecting protrusion 132 connects the pair of side protrusions 131 between them. The pair of side protrusions 131 are formed to be longer vertically than the head 125. Furthermore, the connecting protrusion 132 and the head 125 are disposed separately.

[0075] like Figure 5 As shown, the rotating fixture 110 is loaded onto the low-position stationary blade holding ring 31, as follows. Figure 9 As shown, after rotating the rotating fixture 110 and the low-position stationary blade holding ring 31, when it is necessary to pull the low-position stationary blade holding ring 31 upward from the rotating fixture 110, the operator should... Figure 10 The bolt 120 is loosened and removed from the retaining flange 35 as shown. At this time, the bolt 120 is placed on the protrusion 130 and remains hanging on the protrusion 130 without falling down.

[0076] On the other hand, the diameter (more specifically, the outer diameter) of the first retaining ring 32 is larger than that of the retaining ring body 34, and it is inserted into the slot. Moreover, when the first retaining ring 32 is inserted into the slot 22, and the rotating fixture 110 and the low-position stationary blade retaining ring 31 rotate together as a whole around the central axis in the axial direction, the first retaining ring 32 disengages from the slot 22 while the first fixture 111 inserts into the slot 22.

[0077] The second retaining ring 33 and the protruding threshold 23 are arranged opposite to each other. Moreover, when the rotating fixture 110 and the low stationary blade retaining ring 31 rotate together as a whole around the central axis with the second retaining ring 33 and the protruding threshold 23 arranged opposite to each other, the second retaining ring 33 disengages from the protruding threshold 23 and the second fixture 112 is arranged opposite to the protruding threshold 23.

[0078] The retaining flange 35 protrudes further outward in the radial direction than the second retaining ring 33 and is disposed between the slot 22 and the protruding threshold 23. Moreover, when the rotating fixture 110 and the low-position stationary blade retaining ring 31 rotate together as a whole around the central axis with the retaining flange 35 disposed between the protruding threshold 23 and the slot 22, the retaining flange 35 disengages from the low-position stationary blade retaining ring 31, while the fixture flange 117 is disposed between the protruding threshold 23 and the slot 22.

[0079] The following describes the process of removing the low-position stationary blade holding ring 31 from the low-position turbine housing 21 using the disassembly and assembly device 100, and the process of reassembling it after removal.

[0080] First, the process of removing the low-position stationary blade retaining ring 31 from the low-position turbine housing 21 using the disassembly and assembly device 100 will be explained.

[0081] The operator prepares the aforementioned disassembly and assembly device 100. Furthermore, the operator removes the high-position turbine housing 20 from the low-position turbine housing 21, removes the high-position stationary blade retaining ring 30 and the high-position turbine stationary blade 40 installed thereon from the low-position stationary blade retaining ring 31, and then loads the rotating jig 110 onto the low-position stationary blade retaining ring 31.

[0082] Furthermore, the operator allows the shank 121 of the bolt 120 to penetrate the contact area between the rotating fixture 110 and the low-position stationary blade retaining ring 31, that is, to penetrate the fixture flange 117 and the retaining ring flange 35. At this time, the operator rotates the bolt 120 to tighten the thread 123 of the first shank 122 and the thread of the retaining ring flange 35.

[0083] Subsequently, the operator installs the protrusion 130 by wrapping the head 125 of the bolt 120. Furthermore, the operator rotates the low-position stationary blade retaining ring 31 and the rotating fixture 110 together as a whole, thereby detaching the low-position stationary blade retaining ring 31 from the low-position turbine housing 21 while keeping the rotating fixture 110 within the low-position turbine housing 21. With the eye bolt inserted into the fixture's through hole 115 and the rope passing through the eye bolt and wrapping around the coiled protrusion 116, the rope is pulled circumferentially to rotate the low-position stationary blade retaining ring 31 and the rotating fixture 110.

[0084] Finally, the operator removes the low-position stationary blade retaining ring 31, which is located on the upper side of the rotating jig 110, from the rotating jig 110 through the aforementioned process. Specifically, the operator rotates the bolt 120 to move it downwards, causing the thread 123 of the first rod portion 122 to disengage from the thread of the retaining ring flange 35, and then pulls the low-position stationary blade retaining ring 31 upwards to remove it from the rotating jig 110.

[0085] Next, the process of reassembling the low-position stationary blade retaining ring 31 to the low-position turbine housing 21 using the disassembly and assembly device 100 will be described.

[0086] Following the aforementioned disassembly process, the rotating jig 110 is positioned on the lower turbine housing 21, the bolt 120 and protrusion 130 are mounted on the rotating jig 110, and the lower stationary blade retaining ring 31 is detached from the rotating jig 110. In this situation, the operator places the lower stationary blade retaining ring 31 from the upper side of the rotating jig 110 while simultaneously allowing the bolt 120 to pass through the lower stationary blade retaining ring 31.

[0087] Furthermore, the operator pulls the bolt 120 upwards and rotates it, causing the thread 123 of the first rod portion 121 to be tightened into the thread of the retaining flange 35. Specifically, after the operator tightens the eye bolt into the thread 127 inside the protrusion 126 and pulls the eye bolt upwards to raise the bolt 120, the operator attaches a wrench to the outer circumferential surface of the protrusion 126 and rotates it, thereby tightening the thread 123 of the first rod portion 122 into the thread of the retaining flange 35.

[0088] Subsequently, the operator rotates the low-position stationary blade holding ring 31 and the rotating fixture 110 together as a whole, using the axial direction as a reference, so that the rotating fixture 110 is disengaged from the low-position turbine housing and the low-position stationary blade holding ring 31 is positioned on the low-position turbine housing 21. That is, the operator returns the low-position stationary blade holding ring 31 to its original position.

[0089] Finally, the operator removes the protrusion 130 and bolt 120 from the rotating jig 110 and the low-position stationary blade retaining ring 31, and then removes the rotating jig 110 from the low-position stationary blade retaining ring 31. The operator then assembles the removed high-position stationary blade retaining ring 30 and high-position turbine stationary blade 40 onto the low-position stationary blade retaining ring 31, and assembles the high-position turbine housing 20 onto the high-position stationary blade retaining ring 30, thereby completing the repair / maintenance work on the turbine stator 15.

Claims

1. A device for disassembling and assembling a low-position stationary blade holding ring, characterized in that, include: A rotating fixture, which is mounted on the low-position stationary blade retaining ring installed inside the low-position turbine housing; The bolt penetrates at the contact point between the rotating fixture and the low-position stationary blade retaining ring; and, A protruding part, installed adjacent to the bolt, prevents the bolt from detaching. The bolt component includes: The rod portion passes through the low-position stationary blade retaining ring and the rotating fixture; The head, connected to one end of the rod, has a larger diameter than the rod. The protrusion is disposed on the head side of the bolt. Furthermore, the virtual axis direction passing through the center between the low-position stationary blade holding ring and the rotating fixture is used as a reference. The protrusion includes: A pair of side protrusions are disposed isolated relative to the head along the axial direction; A connecting protrusion connects the pair of side protrusions between the pair of side protrusions.

2. The low-position stationary blade holding ring disassembly and assembly device according to claim 1, characterized in that, The head is positioned on the side of the rotating fixture. The rod extends from the rotating fixture side to the low-position stationary blade holding ring side.

3. The low-position stationary blade holding ring disassembly and assembly device according to claim 1, characterized in that, The rod portion includes: The first rod portion has one end connected to the head, and its outer peripheral surface is threaded. The second rod is connected to the other end of the first rod; The low-position stationary blade retaining ring has a thread at the insertion point of the rod that is threaded to fasten to the first rod.

4. The low-position stationary blade holding ring disassembly and assembly device according to claim 3, characterized in that, The diameter of the second rod is smaller than that of the first rod.

5. The low-position stationary blade holding ring disassembly and assembly device according to claim 1, characterized in that, The vertical length of the pair of side protrusions is longer than that of the head. The connecting protrusion and the head are isolated from each other.

6. The low-position stationary blade holding ring disassembly and assembly device according to claim 1, characterized in that, The bolt also includes: The protrusion, which connects to the other end of the rod, is formed in the shape of a prism, and a wrench for rotating the bolt is mounted thereon.

7. The low-position stationary blade retaining ring disassembly and assembly device according to claim 6, characterized in that, The protrusion is formed in a hollow shape with internal threads to allow the eye bolt to be inserted and tightened. The eye bolt is used to pull the bolt toward the lower stationary blade holding ring side.

8. The low-position stationary blade holding ring disassembly and assembly device according to claim 1, characterized in that, The low-position stationary blade retaining ring includes: The first ring holder and the second ring holder are arranged to be isolated from each other along the axial direction; The ring-holding body connects the first ring-holding member and the second ring-holding member; The rotating fixture includes: The first fixture is connected to the first retaining ring. The second fixture is disposed separately from the first fixture along the axial direction and is connected to the second retaining ring. A plurality of fixture connecting parts connect the first fixture and the second fixture, and are arranged in an isolated manner along the circumferential direction of the first fixture.

9. The low-position stationary blade retaining ring disassembly and assembly device according to claim 8, characterized in that, The low-mounted turbine housing has slots formed on its inner circumferential surface. The diameter of the first retaining ring is larger than that of the retaining ring body, and it is inserted into the slot. When the first retaining ring is inserted into the slot, and the rotating fixture and the low stationary blade retaining ring rotate together as a whole around the central axis in the axial direction, the first retaining ring disengages from the slot while the first fixture inserts into the slot.

10. The low-position stationary blade retaining ring disassembly and assembly device according to claim 8, characterized in that, The low-position stationary blade retaining ring further includes a retaining ring flange, which is disposed between the first retaining ring member and the second retaining ring member, positioned on the outer side of the retaining ring body in the radial direction, and positioned on the rotating jig side, allowing the bolt member to pass through. The rotary fixture also includes a fixture flange disposed between the first fixture component and the second fixture component, and is grounded to the holding ring flange, allowing the protrusion to be mounted thereon.

11. The low-position stationary blade holding ring disassembly and assembly device according to claim 8, characterized in that, The fixture connection portion includes: The connecting part body is disposed between the first fixture and the second fixture; A coiled protrusion protrudes from the connecting body along the circumferential direction of the first fixture, and a rope for driving the rotating fixture to rotate is coiled around it.

12. The low-position stationary blade holding ring disassembly and assembly device according to claim 11, characterized in that, The connecting part body has a through hole for fastening the eye bolt on its outer surface, with the radius direction of the rotating fixture as a reference, and the rope passes through the eye bolt.

13. The low-position stationary blade holding ring disassembly and assembly device according to claim 8, characterized in that, The low-mounted turbine casing has a protruding sill extending radially inward from its inner circumferential surface. The diameter of the second retaining ring is smaller than that of the first retaining ring, and it is configured opposite to the protruding sill. The diameter of the second fixture is smaller than that of the first fixture. With the second holding ring and the protruding threshold arranged opposite each other, when the rotating fixture and the low stationary blade holding ring rotate together as a whole around the central axis in the axial direction, the second holding ring disengages from the protruding threshold while the second fixture is arranged opposite to the protruding threshold.

14. The low-position stationary blade holding ring disassembly and assembly device according to claim 10, characterized in that, The low-mounted turbine housing has a slot formed on its inner circumferential surface, and a protruding sill is formed at a position disposed separately from the slot along the axial direction. The retaining flange protrudes further outward in the radial direction than the second retaining member, and is disposed between the slot and the protruding sill. The flange of the fixture protrudes further outward in the radial direction than the second fixture. With the retaining ring flange positioned between the protruding threshold and the slot, when the rotating fixture and the low-position stationary blade retaining ring rotate together as a whole around the central axis in the axial direction, the retaining ring flange disengages from the low-position stationary blade retaining ring, and the fixture flange is positioned between the protruding threshold and the slot.

15. A method for disassembling a low-position stationary blade retaining ring, characterized in that, Includes the following steps: Step A: Prepare the low-position stationary blade holding ring disassembly and assembly device according to claim 1; Step B: Remove the high-position turbine housing from the low-position turbine housing, remove the high-position stationary blade retainer and the high-position turbine stationary blade installed thereon from the low-position stationary blade retainer, and then load the rotating fixture onto the low-position stationary blade retainer. Step C: Allow the bolt to pass through the contact area between the rotating fixture and the low-position stationary blade retaining ring; Step D: Install the protrusion adjacent to the bolt; Step E: Using the virtual axis direction passing through the center between the low-position stationary blade holding ring and the rotating fixture as a reference, rotate the low-position stationary blade holding ring and the rotating fixture as a whole, so that the low-position stationary blade holding ring disengages from the low-position turbine housing while the rotating fixture is positioned on the low-position turbine housing. and, Step F: Remove the low-position stationary blade retaining ring, which was configured on the upper side of the rotating fixture in step E, from the rotating fixture.

16. The method for disassembling the low-position stationary blade retaining ring according to claim 15, characterized in that, The rod portion includes: The first rod portion has one end connected to the head, and its outer peripheral surface is threaded. The second rod is connected to the other end of the first rod; The low-position stationary blade retaining ring has a thread at the insertion point of the rod portion that is threaded to fasten to the threaded portion of the first rod portion. In step F, after rotating the bolt downwards to disengage the thread of the bolt from the thread of the low-position stationary blade retainer, the low-position stationary blade retainer is pulled upwards to be removed from the rotating fixture.

17. A method for assembling a low-position stationary blade retaining ring, characterized in that, Includes the following steps: Step A: Prepare the low-position stationary blade holding ring disassembly and assembly device according to claim 1; Step B: With the rotating fixture located on the low-position turbine housing and the bolt and protrusion installed on the rotating fixture, the low-position stationary blade retaining ring is placed from the upper side of the rotating fixture onto the rotating fixture while the bolt passes through the low-position stationary blade retaining ring. Step C: Pull the bolt upwards and then rotate it so that the thread of the bolt is tightened into the thread of the low stationary blade retaining ring; Step D: Using the virtual axis direction passing through the center between the low-position stationary blade holding ring and the rotating fixture as a reference, rotate the low-position stationary blade holding ring and the rotating fixture as a whole, so that the rotating fixture is detached from the low-position turbine housing, and install the low-position stationary blade holding ring onto the low-position turbine housing. and, Step E: After removing the protruding part and bolt from the rotating fixture and the low stationary blade retaining ring, remove the rotating fixture from the low stationary blade retaining ring.

18. The method for assembling a low-position stationary blade retaining ring according to claim 17, characterized in that, The rod portion includes: The first rod portion has one end connected to the head, and its outer peripheral surface is threaded. The second rod is connected to the other end of the first rod; The low-position stationary blade retaining ring has a thread at the insertion point of the rod portion that is threaded to fasten to the threaded portion of the first rod portion. The bolt also includes a protrusion connected to the other end of the shank, formed in the shape of a prism, on which a wrench for rotating the bolt is mounted. The protrusion is hollow and has internal threads to allow an eye bolt to be inserted and tightened. This eye bolt is used to pull the bolt towards the lower stationary blade retaining ring side. In step C, after tightening the eye bolt into the thread inside the protrusion and pulling the eye bolt upward to raise the bolt, a wrench is installed on the outer circumferential surface of the protrusion and rotated to tighten the thread of the first rod and the thread of the low stationary blade retaining ring.

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