A steam turbine bellows expansion joint disassembly auxiliary device and disassembly method

Abstract

The present invention aims to provide a steam turbine bellows expansion joint disassembly assistance device and disassembly method that can effectively improve the stability of the bellows expansion joint during the disassembly and maintenance process of the steam turbine. The bellows expansion joint disassembly assistance device comprises an inner connecting portion located on the inside for connecting to the rotor portion of the steam turbine, and an outer connecting portion located on the outside for connecting to the bellows expansion joint of the steam turbine; the inner connecting portion is located between the outer circumference of the rotor portion and the bellows expansion joint, and the connection point between the outer connecting portion and the bellows expansion joint is located at one end of the bellows expansion joint.

Description

Technical Field

[0001] The invention relates to the field of steam turbine equipment disassembly auxiliary devices, in particular to a steam turbine bellows expansion joint disassembly auxiliary device and a disassembly method. Background Art

[0002] Steam turbines are a staple of modern thermal power plants and are also used in the metallurgical and chemical industries, as well as in ship propulsion systems. A steam turbine, also known as a steam turbine engine, is a rotary steam-powered device. High-temperature, high-pressure steam passes through a fixed nozzle, forming an accelerated airflow that is then ejected onto blades, rotating a bladed rotor and performing external work. A steam turbine converts steam's thermal energy into mechanical work. After steam from the boiler enters the turbine, it passes through a series of annular nozzles and moving blades, converting the steam's thermal energy into mechanical energy that rotates the turbine rotor. Steam undergoes different energy conversion processes within the turbine, resulting in turbines with different operating principles. Disassembling and repairing a steam turbine requires the use of large tools to lift and move the turbine.

[0003] For example, a steam turbine rotor lifting device disclosed in the Chinese utility model patent application document with application number CN202023115348.5 includes a steam turbine rotor sling, a sling beam sling, a lifting beam, a pulley A, a sliding saddle, a pin shaft, a sling beam lug, a screw, and a crane hook. The sling beam lifting point is a lifting point that runs through the main body of the sling beam and is welded to the middle position of the main body of the sling beam, which is the lifting point of the lifting device; the sling beam sling is suspended on the main body of the sling beam through the sliding saddle, and is symmetrically divided into the center. It is arranged on both sides of the lifting beam body, and the saddle can slide on the lifting beam body; the turbine rotor sling is connected to the lifting beam sling, and the turbine rotor sling is sleeved on the turbine rotor; the sleeve is fastened to the lifting beam ear, and the pin is installed in the sleeve. The center of the pin is provided with a thread and is connected with the screw rod, which is used to connect the lifting beam ear and the crane hook. The pulley A is fastened to the screw rod, and the pulley A and the screw are integrated into one; the crane hook is connected to the lifting point of the lifting beam through the pin shaft, and the three constitute the bearing point of the lifting device.

[0004] For example, a steam turbine rotor lifting tool disclosed in the Chinese utility model patent application document with application number CN202023115348.5 includes a crossbeam, on which a pair of lower hangers are suspended, symmetrically arranged relative to the center of gravity of the crossbeam, and the lower hangers are equipped with lower slings for hanging the steam turbine rotor; a hanger is provided on the top surface of the crossbeam at the center of gravity of the crossbeam, for being hooked by a crane hook; the lower hangers are movably connected to the crossbeam, and the span of the two lower hangers can be freely adjusted; the crossbeam is also provided with a pair of upper hangers, symmetrically arranged relative to the center of gravity of the crossbeam, and the upper hangers are equipped with upper slings for being hooked by a crane hook; the upper hanger is an axial structure, and a hole adapted to the axial structure is provided on the crossbeam, and the upper hanger is installed in the hole; the length of the shaft is greater than the length of the hole, and the two ends of the shaft extend out of the two ends of the hole respectively, and the lengths of the extended parts are the same; the two ends of the shaft are provided with flanges, and a gap space is formed between the flange and the hole, and the upper sling is located in the gap space to hang the shaft.

[0005] However, large steam turbines typically feature two expansion joints installed at the rotor ends. These expansion joints are designed to absorb deformation of the outer casing without transmitting it to the shaft seal, reducing friction between the rotor and the seal. Expansion joints are typically mounted on the turbine rotor in a relatively flexible manner. During turbine disassembly and maintenance, the rotor and its associated moving parts must be removed from the turbine body by hoisting. To prevent movement of the expansion joints during rotor rotation maintenance, which could affect the overall balance of the hoisting system and even cause them to become detached, the expansion joints must be independently hoisted and disassembled before rotor maintenance. However, due to the weight and size of the expansion joints themselves, the disassembly process requires high-risk steps such as hoisting the expansion joints and changing the hoisting straps. This not only increases the number of steps and time required, but also poses a significant risk of collision and damage to other components, creating significant inconvenience.

[0006] In response to the above problems, the present invention provides a steam turbine bellows expansion joint disassembly auxiliary device and disassembly method, which can effectively improve the stability of the bellows expansion joint during the disassembly and maintenance of the steam turbine. Summary of the Invention

[0007] The present invention provides a steam turbine bellows expansion joint disassembly auxiliary device and a disassembly method, which can effectively improve the stability of the bellows expansion joint during the disassembly and maintenance process of the steam turbine.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] A steam turbine bellows expansion joint disassembly auxiliary device comprises an inner connecting portion located on the inner side for connecting to the rotor portion of the steam turbine, and an outer connecting portion located on the outer side for connecting to the bellows expansion joint of the steam turbine; the inner connecting portion is located between the outer peripheral surface of the rotor portion and the bellows expansion joint, and the connection point between the outer connecting portion and the bellows expansion joint is located at one end of the bellows expansion joint.

[0010] As a preferred embodiment of the present invention, along the extension direction of the axis of the rotor part, the inner connecting portion is located between the two end surfaces of the bellows expansion joint.

[0011] As a preferred embodiment of the present invention, the internal connection portion is formed on the internal connection component on the inner side of the device, and the external connection portion is formed on the external connection component on the outer side of the device, and the internal connection component and the external connection component are connected and fixed by a detachable connection structure, and the detachable connection structure includes an internal connection slot and an external connection slot respectively located on the internal connection component and the external connection component, and a fastening connection piece that can lock and fix the two components by passing through the internal connection slot and the external connection slot at the same time.

[0012] As a preferred embodiment of the present invention, the inner connecting part in the inner connecting component is in a circular shape as a whole, and the outer connecting components are evenly spaced around the outer circumference of the inner connecting part; the outer circumference of the inner connecting part protrudes outward to form an outward extension section for connecting to the outer connecting component on the outside.

[0013] As a preferred embodiment of the present invention, the inner connecting portion is a split structure formed by a plurality of arc segments connected to each other.

[0014] As a preferred embodiment of the present invention, the external connection component further includes a bent extension section for connecting to the outward extension section; the bent extension section as a whole extends along the axial direction of the rotor part, and the external connection section as a whole extends along the radial direction of the rotor part, and the internal connection slot and the external connection slot are respectively opened on the outward extension section and the bent extension section.

[0015] As a preferred embodiment of the present invention, a transition stiffening rib is further provided at the connection transition between the bent extension section and the outer connecting portion, which serves to enhance the connection strength at the bent portion.

[0016] As a preferred embodiment of the present invention, there are multiple installation positions between the inner connecting component and the outer connecting component, which are used to connect and fix the inner connecting component and the outer connecting component at different relative positions along the axis of the rotor part.

[0017] As a preferred embodiment of the present invention, in a pair of the inner connecting slots and the outer connecting slots that cooperate with each other, at least one of the slots is in the shape of an elongated strip extending along the axis direction of the rotor.

[0018] A method for disassembling a steam turbine bellows expansion joint, comprising the above-mentioned steam turbine bellows expansion joint disassembly auxiliary device, comprises the following steps:

[0019] a. The inner connecting assembly is mounted around one end of the turbine rotor portion so that the inner wall surface of the inner connecting portion of the inner connecting assembly fits with the outer wall surface of the rotor portion;

[0020] b. Arrange each outer connecting component in the form of a surrounding inner connecting component and use the fastening connector to sequentially fix each outer connecting component to the outer side of the inner connecting component;

[0021] c. Connecting and fixing the outer connection assembly to the end of the corrugated expansion joint so that the steam turbine corrugated expansion joint disassembly auxiliary device is connected to the corrugated expansion joint to form an integral whole;

[0022] d. Use external lifting equipment to lift and dismantle the integral body formed by the connection between the steam turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint.

[0023] In summary, the present invention can achieve the following multiple beneficial effects:

[0024] 1. The steam turbine bellows expansion joint disassembly auxiliary device described in the present invention can connect and fix the bellows expansion joint that is easy to move during the hoisting and maintenance process to the rotor part, so that the rotor part and the bellows expansion joint form a stably connected integral structure. The steam turbine bellows expansion joint disassembly auxiliary device can effectively prevent the bellows expansion joint from moving to both sides when the rotor part is removed from the steam turbine body, thereby stabilizing the center of gravity of the entire rotor, preventing the hoisting system from overturning and the risk of safety accidents that may occur; of course, in the process of gradually rotating the rotor part for maintenance and inspection, it can also always ensure that the center of gravity of the entire rotor is located on the central axis of the rotor part, reducing the obstruction during rotation and the wear between components, and playing an effective protective role.

[0025] 2. The steam turbine bellows expansion joint disassembly auxiliary device described in the present invention connects and fixes the bellows expansion joint and the rotor part, so that the rotor part and the bellows expansion joint form a stably connected whole, eliminating the process of dismantling the bellows expansion joint during the hoisting process, greatly reducing the operation process of hoisting and inspection and maintenance, and effectively improving work efficiency.

[0026] 3. In the steam turbine bellows expansion joint disassembly auxiliary device described in the present invention, the inner connecting component and the rotor part are preferably connected through the fitting contact of the arc surface, and the connection point between the outer connecting component and the bellows expansion joint is located at the end of the bellows expansion joint. It can greatly reduce the wear and collision effects on the inner wall surface of the bellows expansion joint while ensuring a stable supporting effect, thereby achieving an effective protective effect.

[0027] 4. In a preferred solution of the turbine bellows expansion joint disassembly auxiliary device described in the present invention, a split structure is adopted both for the inner connecting part itself and between the outer connecting component and the inner connecting component, which can be quickly installed and disassembled at the actual installation position of the bellows expansion joint, which is convenient and efficient.

[0028] 5. The turbine bellows expansion joint disassembly auxiliary device described in the present invention sets the connection point between the external connection component and the bellows expansion joint at one end of the bellows expansion joint, and sets the internal connection part used to fit with the rotor part to play a supporting role between the two ends of the bellows expansion joint. By having multiple installation positions and adjusting the actual installation position, it can effectively alleviate the unbalanced load-bearing situation at the contact point between the internal connection part of the auxiliary device installed on one side and the turbine rotor part, thereby reducing local wear during inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the steam turbine bellows expansion joint disassembly auxiliary device;

[0030] Figure 2 This is a schematic diagram of the lateral structure of the steam turbine bellows expansion joint disassembly auxiliary device;

[0031] Figure 3 It is a schematic diagram of the enlarged structure of the internal connection components;

[0032] Figure 4 It is a structural diagram of the inner connection component and the outer connection component when they are connected;

[0033] Figure 5 This is a structural diagram of the steam turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint being connected and fixed to each other;

[0034] Figure 6 This is a schematic diagram of the process steps for hoisting and removing the bellows expansion joint under normal conditions.

[0035] In the picture:

[0036] 1——Rotor part;

[0037] 2——Bellows expansion joint;

[0038] 3 - internal connection assembly, 301 - internal connection portion, 302 - outward extension section;

[0039] 4 - external connection assembly, 401 - external connection portion, 402 - bent extension section;

[0040] 5 - detachable connection structure, 501 - inner connection notch, 502 - outer connection notch, 503 - fastening connector;

[0041] 6——Transition stiffener. DETAILED DESCRIPTION

[0042] The following specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0043] This solution is achieved through the following technical means:

[0044] Example: In this example, a steam turbine bellows expansion joint disassembly auxiliary device is provided, which can effectively improve the stability of the bellows expansion joint 2 during the disassembly and maintenance process of the steam turbine. The main part of the auxiliary device is installed between the outer wall of the steam turbine rotor part 1 and the inner wall of the bellows expansion joint 2. It includes an inner connecting part 301 located on the inner side for connecting with the rotor part 1 of the steam turbine, and an outer connecting part 401 located on the outer side for connecting with the bellows expansion joint 2 of the steam turbine; the inner connecting part 301 is located between the outer peripheral surface of the rotor part 1 and the bellows expansion joint 2, and the connection point between the outer connecting part 401 and the bellows expansion joint 2 is located at one end of the bellows expansion joint 2.

[0045] Specifically, from a structural perspective, the steam turbine bellows expansion joint disassembly auxiliary device primarily consists of an interconnected inner connection assembly 3 and an outer connection assembly 4. The inner connection portion 301 is formed on the inner connection assembly 3 on the inner side of the device, while the outer connection portion 401 is formed on the outer connection assembly 4 on the outer side of the device. The inner connection portion 301 is used to connect to the cylindrical portion of the rotor portion 1. Therefore, the inner connection portion 301 is also designed as a circular ring with a smooth inner wall. To facilitate assembly and disassembly, the circular inner connection portion 301 can be further divided into multiple interconnected arc segments. For example, referring to the structure shown in the accompanying drawings of the present invention, a structure is adopted in which two upper and lower semicircular arc segments are connected to each other at the position of the rotor portion 1 corresponding to the bellows collision joint and connected by bolt assemblies on both sides to form a complete annular component. The inner connection assembly 3 also includes an outwardly extending extension segment 302 formed by the outer circumference of the annular inner connection portion 301, which is used to connect to the outer connection assembly 4 on the outer side. In this embodiment, the outward extension section 302 is selected to be a rectangular block as a whole, and four outward extension sections 302 are integrally connected to the outer periphery of the annular inner connecting portion 301, with a ninety-degree inner angle as the separation interval. The four outward extension sections 302 are spaced equal distances apart from each other and are evenly installed and connected to the outer peripheral surface of the inner connecting portion 301.

[0046] As for the external connection components 4 installed on the outside, their number corresponds to the number of the aforementioned outward extension sections 302, so four groups are also used in this embodiment and correspond to the arrangement positions of the aforementioned outward extension sections 302. The external connection components 4 also include the aforementioned external connection part 401 for connecting and fixing with the bellows expansion joint 2 and the bent extension section 402 for connecting and fixing with the internal connection component 3. Specifically, the external connection component 4 is L-shaped as a whole, wherein the part extending outward on the vertical plane is the external connection part 401, and the part extending in a direction parallel to the axis of the rotor part 1 at a ninety-degree angle to the external connection part 401 is the bent extension section 402. The external connection part 401 and the bent extension section 402 described here are formed together. Considering the bearing strength problem, a transition stiffening rib 6 that is connected to both parts is also provided at the position of the bent transition connection. Since the end face of the bellows expansion joint 2 only plays a stopping role during use, a threaded hole can be opened on the end face of the bellows expansion joint 2, and a bolt is passed through the mounting hole opened on the external connection part 401 and the threaded hole to realize the locking connection and fixation between the external connection component 4 and the bellows expansion joint 2.

[0047] The inner connecting assembly 3 and the outer connecting assembly 4 are also separate and connected via a detachable connecting structure 5. Specifically, the outward extension section 302 and the bent extension section 402 are respectively provided with an inner connecting slot 501 and an outer connecting slot 502 extending radially through the rotor section 1. A pair of bolts and nuts serving as fastening members 503 secure the two components together.

[0048] As a preferred solution, multiple mounting positions can be set between the inner connection component 3 and the outer connection component 4 to achieve the connection and fixation of the inner connection component 3 and the outer connection component 4 at different relative positions along the axis of the rotor part 1. Specifically, in a pair of the inner connection slots 501 and the outer connection slots 502 that cooperate with each other, at least one of the slots is in the shape of a long strip extending along the axis of the rotor. Through the setting of this structure, the relative position between the outer connection component 4 and the inner connection component 3 along the axis of the turbine rotor part 1 can be adjusted before the fastening connector 503 is locked and fixed. Under the premise that the inner connection part 301 does not protrude from the end face of the bellows expansion joint 2, the center of gravity of the turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint 2 connected as a whole falls on the inner connection part 301 that plays a bearing role, so that the force at the contact position is more balanced.

[0049] When installing the steam turbine bellows expansion joint disassembly auxiliary device, the following steps should be followed in sequence: a. When installing the steam turbine bellows expansion joint disassembly auxiliary device, the following steps should be followed in sequence for connection and fixation: the inner connection component 3 is installed around one end of the steam turbine rotor part 1 so that the inner wall surface of the inner connection part 301 in the inner connection component 3 fits with the outer wall surface of the rotor part 1; b. each outer connection component 4 is arranged in the form of surrounding the inner connection component 3 and the fastening connector 503 is used to fix each outer connection component 4 to the outside of the inner connection component 3 in sequence; c. the outer connection component 4 is connected and fixed to the end of the bellows expansion joint 2 so that the steam turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint 2 are connected to form a whole; d. the integral body formed by the connection of the steam turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint 2 is hoisted and disassembled by using external lifting equipment.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A steam turbine bellows expansion joint disassembly auxiliary device, characterized by: The invention comprises an inner connecting portion (301) located on the inner side for connecting to a rotor portion (1) of a steam turbine, and an outer connecting portion (401) located on the outer side for connecting to a bellows expansion joint (2) of the steam turbine; the inner connecting portion (301) is located between the outer peripheral surface of the rotor portion (1) and the bellows expansion joint (2), and the connection point between the outer connecting portion (401) and the bellows expansion joint (2) is located at one end of the bellows expansion joint (2); The inner connection portion (301) is formed on the inner connection component (3) on the inner side of the device, and the outer connection portion (401) is formed on the outer connection component (4) on the outer side of the device, and the inner connection component (3) and the outer connection component (4) are connected and fixed via a detachable connection structure (5), and the detachable connection structure (5) includes an inner connection notch (501) and an outer connection notch (502) respectively located on the inner connection component (3) and the outer connection component (4), and a fastening connection member (503) capable of locking and fixing the two components by simultaneously passing through the inner connection notch (501) and the outer connection notch (502); The inner connecting portion (301) in the inner connecting component (3) is in the shape of a circular ring as a whole, and the outer connecting components (4) are evenly spaced around the outer periphery of the inner connecting portion (301); the outer periphery of the inner connecting portion (301) protrudes outward to form an outward extension section (302) for connecting to the outer connecting component (4); The outer connection component (4) further comprises a bent extension section (402) for connecting to the outward extension section (302); the bent extension section (402) as a whole extends along the axial direction of the rotor section (1), while the outer connection section (401) as a whole extends along the radial direction of the rotor section (1); the inner connection slot (501) and the outer connection slot (502) are respectively provided on the outward extension section (302) and the bent extension section (402); Along the axial extension direction of the rotor part (1), the inner connecting portion (301) is located between the two end surfaces of the bellows expansion joint (2); In a pair of the inner connecting slots (501) and the outer connecting slots (502) that cooperate with each other, at least one of the slots is in the shape of a long strip extending along the axial direction of the rotor part (1).

2. The steam turbine bellows expansion joint disassembly auxiliary device according to claim 1, characterized in that: The inner connecting portion (301) is a split structure formed by a plurality of arc-shaped segments connected to each other.

3. The steam turbine bellows expansion joint disassembly auxiliary device according to claim 1, characterized in that: A transition stiffening rib (6) is also provided at the connection transition between the bent extension section (402) and the external connection portion (401) to enhance the connection strength at the bent section.

4. The steam turbine bellows expansion joint disassembly auxiliary device according to claim 3, characterized in that: There are multiple mounting positions between the inner connecting component (3) and the outer connecting component (4), which are used to connect and fix the inner connecting component (3) and the outer connecting component (4) at different relative positions along the axis direction of the rotor part (1).

5. A method for disassembling a steam turbine bellows expansion joint, characterized in that: The steam turbine bellows expansion joint disassembly auxiliary device according to claim 1 comprises the following steps: a. The inner connecting assembly (3) is mounted around one end of the turbine rotor portion (1), so that the inner wall surface of the inner connecting portion (301) of the inner connecting assembly (3) fits with the outer wall surface of the rotor portion (1); b. Arranging the outer connection components (4) so ​​as to surround the inner connection component (3) and using the fastening connector (503) to sequentially fix the outer connection components (4) to the outer side of the inner connection component (3); c. Connecting and fixing the outer connection assembly (4) to the end of the corrugated expansion joint (2) so that the steam turbine corrugated expansion joint disassembly auxiliary device and the corrugated expansion joint (2) are connected to form a whole; d. Using external lifting equipment, lift and dismantle the integral body formed by connecting the steam turbine bellows expansion joint disassembly auxiliary device and the bellows expansion joint (2).

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