A disassembly tool and disassembly method for a grate sealing ring of a low-pressure turbine rotor

Abstract

The present invention belongs to the technical field of gas turbine disassembly and assembly, and specifically relates to a disassembly tool and disassembly method for a comb tooth sealing ring of a low-pressure turbine rotor, wherein the disassembly tool comprises a locking plate, a positioning plate and a hook; a second center hole is arranged at the center of the positioning plate; a plurality of hooks are arranged in the circumferential direction on the positioning plate, and the hooks are rotatably connected to the positioning plate; hooks are arranged on the claw fingers of the hooks, and the hooks of the plurality of hooks can grasp the outer edge of the comb tooth sealing ring when gathered together; an ejector screw is threadedly connected to the positioning plate, and the end of the ejector screw can abut against the low-pressure turbine rotor; a first center hole is arranged at the center of the locking plate; and the locking plate is used to lock the position of the hook. The structure of this scheme reduces the size, weight and volume of the disassembly tool, does not need to use a large lifting device for assistance, and is easy and convenient to use; the locking plate can lock the hook, which can effectively reduce the probability of the hook being separated from the comb tooth sealing ring and damaging the components of the low-pressure turbine rotor.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbine disassembly and assembly, and in particular relates to a disassembly tool and a disassembly method for a grate tooth sealing ring of a low-pressure turbine rotor. Background Art

[0002] The low-pressure turbine rotor assembly is an important component of a twin-rotor gas turbine and is an important component that is responsible for converting high-temperature combustion gas into kinetic energy. The working area of ​​the low-pressure turbine rotor has a high temperature, large airflow thermal shock, and high load. The quality of its assembly directly affects the safety of gas turbine operation. The low-pressure turbine rotor assembly is also the part with a relatively short lifespan among the hot end components of the gas turbine and requires frequent disassembly, inspection, and maintenance.

[0003] The low-pressure turbine rotor assembly consists of the low-pressure turbine shaft, the inner ring of the No. 5 bearing, the sealing grate ring, the working blades, and the turbine disc. During the overhaul and overhaul of the gas turbine, the hot end components often need to be inspected and maintained. The inner ring of the bearing is always under high-intensity alternating loads during operation, which makes the bearing life relatively short. In addition, due to the special structure of the sealing grate ring, the grate tips of the sealing grate ring are prone to collision and wear damage during operation, which directly affects the sealing of the bearing cavity lubricating oil and even causes oil leakage in the bearing cavity during operation.

[0004] In order to ensure the stability and tightness of the structural connection, the bearing inner ring and the comb tooth sealing ring are connected to the low-pressure turbine shaft by interference fit. The bearing inner ring and the comb tooth sealing ring are often installed in a semi-closed annular cavity between the low-pressure turbine disc and the low-pressure turbine shaft, which makes it extremely difficult to disassemble.

[0005] The length of the low-pressure turbine shaft of a gas turbine is often more than 1500 mm. The conventional standard puller decomposition has the following defects:

[0006] 1. The claws of the standard puller need to be very long. Due to the space limitation of the semi-enclosed annular cavity, the claws cannot be very thick. After applying force, the claws are easy to bounce off and damage other parts.

[0007] 2. The length of the puller is very long, the size is larger, and the weight is higher. When using large equipment such as cranes to assist, it is easy to damage the parts;

[0008] 3. It is difficult to control the stroke and direction of the drawing, which may cause the ring to be pulled obliquely or off-center, causing damage to the parts or even scrapping them;

[0009] 4. After the pulling is completed, the inner ring of the bearing and the comb sealing ring are easily separated from the low-pressure turbine shaft and fall due to inertia, which may damage the parts.

[0010] For this reason, it is also necessary to design a disassembly tooling structure specifically used for disassembling the comb tooth sealing ring. Summary of the invention

[0011] In order to solve the above problems existing in the prior art, the present invention provides a disassembly tool and a disassembly method for a comb tooth sealing ring of a low-pressure turbine rotor.

[0012] The technical solution adopted by the present invention is:

[0013] A disassembly tool for a grate sealing ring of a low-pressure turbine rotor, comprising a locking plate, a positioning plate and a hook claw;

[0014] The low-pressure turbine rotor has a low-pressure turbine shaft; the grate tooth sealing ring is coaxially sleeved on the low-pressure turbine shaft and transitionally matched with the low-pressure turbine shaft;

[0015] A second center hole is provided at the center of the positioning plate, and the second center hole is used for the low-pressure turbine shaft to penetrate; a plurality of hook claws are provided on the circumference of the positioning plate, and the hook claws are rotatably connected to the positioning plate; a hook portion is provided on the claw finger of the hook claw, and the hook portions of the plurality of hook claws can grasp the outer edge of the comb tooth sealing ring when gathered together;

[0016] An ejector screw is threadedly connected to the positioning plate, and an end of the ejector screw can abut against the low-pressure turbine rotor;

[0017] A first center hole is arranged at the center of the locking disk, and the first center hole is used for the low-pressure turbine shaft to penetrate; the locking disk is used for locking the position of the hook claw.

[0018] As an alternative or supplement to the above-mentioned disassembly tool: a hook claw locking groove is provided on the disk surface of the locking disk, and a hook claw locking column is provided at the handle end of the hook claw; when the locking disk overlaps and covers the end surface of the positioning disk, the hook claw locking column is inserted into the hook claw locking groove to lock the position of the hook claw.

[0019] As an alternative or supplement to the above-mentioned disassembly tooling: the positioning plate includes a main plate body and an extension arm; the main plate body is in a circular ring shape, and the second center hole is arranged at the center of the main plate body; multiple extension arms are distributed along the outer circumference of the main plate body, and the extension arms are provided with nail threaded holes and hook claw mounting holes, the ejector screw is threadedly connected to the threaded hole of the rod, and the hook claw extends into the hook claw mounting hole and is connected to the extension arm through a pin shaft.

[0020] As an alternative or supplement to the above-mentioned disassembly tool: the extension arm and / or the main disk body are provided with a nail threaded hole, and the locking disk is provided with a nail arc hole; when the connecting screw passes through the nail arc hole and is connected with the nail threaded hole, the locking disk and the positioning disk can be fixedly connected.

[0021] As an alternative or supplement to the above-mentioned disassembly tooling: the locking disk is also provided with a rod-penetrating arc hole for the ejection screw to pass through; the nail-penetrating arc hole and the rod-penetrating arc hole are both arc-shaped, and the arc centers of the nail-penetrating arc hole and the rod-penetrating arc hole coincide with the center of the locking disk.

[0022] As an alternative or supplement to the above-mentioned disassembly tool: a plurality of hook claw installation positions are arranged in each of the hook claw installation holes, the hook claw can be installed on different hook claw installation positions, and the plurality of hook claw installation positions are arranged along the radial direction of the positioning plate.

[0023] As an alternative or supplement to the above-mentioned disassembly tooling: a blind groove is provided on the locking disk, and a plurality of hook claw locking grooves are provided at the bottom of the blind groove, and the plurality of hook claw locking grooves are arranged radially along the locking disk; the positions of the hook claw locking grooves correspond one-to-one to the positions of the hook claw mounting positions.

[0024] As an alternative or supplement to the above-mentioned disassembly tooling: a blind groove is provided on the locking disk, a curved hook locking groove is provided at the bottom of the blind groove, and different arc segments of the hook locking groove are respectively located at different diameter positions of the locking disk; the position of the hook locking groove corresponds one-to-one to the position of the arc segment.

[0025] As an alternative or supplement to the above-mentioned disassembly tool: the disassembly tool also includes a gasket ring, which is arranged between the end of the ejection screw and the low-pressure turbine rotor.

[0026] A method for disassembling a grate sealing ring of a low-pressure turbine rotor, using the above-mentioned disassembly tool, the disassembly method comprises the following steps:

[0027] S1: Sleeve the gasket ring onto the outside of the low-pressure turbine shaft and abut against the turbine disk of the low-pressure turbine rotor;

[0028] S2: Sleeve the positioning disc onto the outside of the low-pressure turbine shaft, and hook the claws onto the edge of the grate tooth sealing ring;

[0029] S3: Sleeve the locking plate onto the outside of the low-pressure turbine shaft and overlap it on the positioning plate so that the locking plate locks the position of the hook claw, and fix the locking plate and the positioning plate with connecting screws;

[0030] S4: Use the ejector screw to pass through the locking plate and the positioning plate and press against the gasket; tighten the ejector screw and pull the comb tooth sealing ring outward from the low-pressure turbine shaft.

[0031] The beneficial effects of the present invention are:

[0032] 1. In this solution, since a second center hole is provided at the center of the positioning disk, it can be close to the comb tooth sealing ring when in use, so that the length of the hook claw can be extended into the semi-enclosed annular cavity between the low-pressure turbine disk and the low-pressure turbine shaft; the size, weight and volume of the disassembly tooling can be effectively reduced, and there is no need to use a large lifting device for assistance, which is easy and convenient to use;

[0033] 2. In this solution, since the locking plate can lock the position of the hook, when force is applied, the probability of the hook being separated from the comb teeth sealing ring and damaging the components of the low-pressure turbine rotor can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0035] Figure 1 It is a diagram showing the use status of the disassembly tooling;

[0036] Figure 2 It is a partial structural diagram of the disassembly tooling;

[0037] Figure 3 (a) is a schematic diagram of the structure of a locking disk;

[0038] Figure 3 (b) is a schematic diagram of the structure of another locking disk;

[0039] Figure 4 (a) is a perspective view of the hook;

[0040] Figure 4 (b) is another perspective of the hook;

[0041] Figure 5 It is a structural diagram of the positioning disk;

[0042] Figure 6 It is a structural diagram of the low-pressure turbine shaft.

[0043] In the figure: 1-low-pressure turbine shaft; 3-turbine disk; 4-comb sealing ring; 5-bearing inner ring; 6-connecting screw; 7-locking disk; 71-first center hole; 72-claw locking groove; 73-nail arc hole; 74-rod arc hole; 8-pin shaft; 9-positioning disk; 91-main disk body; 92-claw mounting hole; 93-rod threaded hole; 94-second center hole; 95-extension arm; 96-nail threaded hole; 10-ejection screw; 11-washer ring; 12-claw; 121-claw locking column; 122-pin hole; 123-claw finger; 124-hook part. DETAILED DESCRIPTION

[0044] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0045] Example 1

[0046] like Figures 1 to 6 As shown, this embodiment designs a disassembly tool for the comb seal ring 4 of the low-pressure turbine rotor, including a locking plate 7, a positioning plate 9, an ejector screw 10, a gasket 11 and a hook 12 and other components.

[0047] The low-pressure turbine rotor comprises a low-pressure turbine shaft 1 , a turbine disk 3 and other components. The turbine disk 3 is arranged at the rear end of the low-pressure turbine shaft 1 , and a semi-closed annular cavity is formed between the turbine disk 3 and the low-pressure turbine shaft 1 .

[0048] The bearing inner ring 5 and the comb teeth sealing ring 4 are both coaxially sleeved on the low-pressure turbine shaft 1, and the bearing inner ring 5 and the comb teeth sealing ring 4 are transitionally matched with the low-pressure turbine shaft 1; the end face of the bearing inner ring 5 abuts against the comb teeth sealing ring 4.

[0049] A second center hole 94 is provided at the center of the positioning disk 9, and the second center hole 94 is used for the insertion of the low-pressure turbine shaft 1; when the positioning disk 9 is installed, due to the structure of the second center hole 94, the positioning disk 9 can be closer to the comb tooth sealing ring 4, thereby reducing the difficulty of installing the disassembly tooling and the difficulty of disassembling the bearing inner ring 5 and the comb tooth sealing ring 4.

[0050] A plurality of hooks 12 are arranged on the circumference of the positioning disk 9, and the hooks 12 are rotatably connected to the positioning disk 9; a hook portion 124 is arranged on the claw finger 123 of the hook 12, and the hook portions 124 of the plurality of hooks 12 can grasp the outer edge of the comb teeth sealing ring 4 when gathered together; because the positioning disk 9 can be sleeved outside the low-pressure turbine shaft 1, and the positioning disk 9 is close to the comb teeth sealing ring 4, the length of the hook 12 does not need to be too large, and it can be extended into the semi-enclosed annular cavity between the low-pressure turbine disk 3 and the low-pressure turbine shaft 1. The overall size, weight and volume of the disassembly tooling are effectively reduced, and at the same time, there is no need to use large lifting tools for assistance, and it is easy and convenient to use.

[0051] A first center hole 71 is provided at the center of the locking disk 7, and the first center hole 71 is used for the insertion of the low-pressure turbine shaft 1; the locking disk 7 is used to lock the position of the hook 12; since the locking disk 7 can lock the position of the hook 12, when force is applied, the probability of the hook 12 being separated from the comb tooth sealing ring 4 and damaging the components of the low-pressure turbine rotor can be effectively reduced.

[0052] An ejector screw 10 is threadedly connected to the positioning disk 9, and the end of the ejector screw 10 can be abutted against the low-pressure turbine rotor; when the ejector screw 10 is tightened, the positioning disk 9 can be pushed away from the turbine disk 3 of the low-pressure turbine rotor, thereby pulling out the bearing inner ring 5 and the comb tooth sealing ring 4 through the claws 12.

[0053] The structure of locking the hook claw 12 by the locking disk 7 can be: a hook claw locking groove 72 is provided on the disk surface of the locking disk 7, and a hook claw locking column 121 is provided at the handle end of the hook claw 12; when the locking disk 7 overlaps and covers the end surface of the positioning disk 9, the hook claw locking column 121 is inserted into the hook claw locking groove 72 to lock the position of the hook claw 12.

[0054] Each hook mounting hole 92 is provided with a plurality of hook mounting positions, and the hook 12 can be mounted on different hook mounting positions, and the plurality of hook mounting positions are arranged along the radial direction of the positioning plate 9. When the bearing inner ring 5 and the comb tooth sealing ring 4 of different sizes are disassembled, the hook 12 can be mounted on the corresponding hook mounting position.

[0055] The locking plate 7 is provided with a blind groove, and a plurality of hook claw locking grooves 72 can be provided at the bottom of the blind groove, and the plurality of hook claw locking grooves 72 are arranged along the radial direction of the locking plate 7; the positions of the hook claw locking grooves 72 correspond to the positions of the hook claw installation positions one by one, such as Figure 3 Alternatively, the locking plate 7 is provided with a blind groove, and a curved hook locking groove 72 is provided at the bottom of the blind groove, and different arc segments of the hook locking groove 72 are respectively located at different diameter positions of the locking plate 7; the position of the hook locking groove 72 corresponds to the position of the arc segment, as shown in FIG. Figure 3 The position of the hook installation position corresponds to the position of the hook lock slot 72, which can make the hook 12 more horizontal, so that the claw finger 123 of the hook 12 is close to parallel with the axis of the positioning plate 9, thereby reducing the radial force component when the hook 12 is pulled out and reducing the probability of the hook 12 falling off.

[0056] The extension arm 95 and / or the main plate body 91 are provided with a nail threading hole 96, and the locking plate 7 is provided with a nail threading arc hole 73; when the connecting screw 6 passes through the nail threading arc hole 73 and is connected to the nail threading hole 96, the locking plate 7 can be fixedly connected to the positioning plate 9, so that the locking plate 7 can lock the hook 12 firmly. The locking plate 7 is also provided with a rod threading arc hole 74 for the ejection screw 10 to pass through. The nail threading arc hole 73 and the rod threading arc hole 74 are both arc-shaped, and the arc centers of the nail threading arc hole 73 and the rod threading arc hole 74 coincide with the center of the locking plate 7, so that when the locking plate 7 rotates at a moving angle, the installation of the locking plate 7 can still be guaranteed, reducing the difficulty of installing the locking plate 7.

[0057] The positioning plate 9 includes a main plate body 91 and an extension arm 95; the main plate body 91 is in a circular shape, and the second center hole 94 is arranged at the center of the main plate body 91; a plurality of extension arms 95 are distributed along the outer periphery of the main plate body 91, and the extension arms 95 are provided with nail threaded holes 96 and hook claw mounting holes 92, the ejector screw 10 is threadedly connected to the through rod threaded hole 93, the hook claw 12 extends into the hook claw mounting hole 92 and is connected to the extension arm 95 through the pin shaft 8, and the pin shaft 8 is connected to the pin hole 122 on the hook claw 12.

[0058] The backing ring 11 is disposed between the end of the ejector screw 10 and the low-pressure turbine rotor to increase the contact area with the turbine disk 3, thereby preventing the ejector screw 10 from damaging the turbine disk 3 during ejection.

[0059] Example 2

[0060] This embodiment designs a method for disassembling a grate sealing ring 4 of a low-pressure turbine rotor, using the disassembly tool in Embodiment 1, and the disassembly method includes the following steps:

[0061] S1: The gasket 11 is sleeved onto the outside of the low-pressure turbine shaft 1 and abutted against the turbine disk 3 of the low-pressure turbine rotor;

[0062] S2: Sleeve the positioning plate 9 onto the outside of the low-pressure turbine shaft 1, and hook the hook 12 onto the edge of the comb tooth sealing ring 4;

[0063] S3: Sleeve the locking plate 7 onto the outside of the low-pressure turbine shaft 1 and overlap it onto the positioning plate 9, so that the locking plate 7 locks the position of the hook 12, and fix the locking plate 7 and the positioning plate 9 with the connecting screws 6;

[0064] S4: Use the ejector screw 10 to pass through the locking plate 7 and the positioning plate 9, and abut against the gasket 11; tighten the ejector screw 10, and pull the bearing inner ring 5 and the comb sealing ring 4 outward from the low-pressure turbine shaft 1.

[0065] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A disassembly tool for a grate seal ring of a low-pressure turbine rotor, characterized in that: It comprises a locking plate (7), a positioning plate (9) and a hook (12); The low-pressure turbine rotor comprises a low-pressure turbine shaft (1); a grate sealing ring (4) is coaxially sleeved on the low-pressure turbine shaft (1) and transitionally matched with the low-pressure turbine shaft (1); A second center hole (94) is provided at the center of the positioning disk (9), and the second center hole (94) is used for the low-pressure turbine shaft (1) to penetrate therethrough; a plurality of hook claws (12) are provided in the circumferential direction of the positioning disk (9), and the hook claws (12) are rotatably connected to the positioning disk (9); a hook portion (124) is provided on a claw finger (123) of the hook claw (12), and the hook portions (124) of the plurality of hook claws (12) can grasp the outer edge of the comb tooth sealing ring (4) when gathered together; An ejector screw (10) is threadedly connected to the positioning plate (9), and an end of the ejector screw (10) is capable of abutting against a low-pressure turbine rotor; A first center hole (71) is provided at the center of the locking disk (7), and the first center hole (71) is used for the low-pressure turbine shaft (1) to penetrate therethrough; the locking disk (7) is used for locking the position of the hook claw (12); A hook claw locking groove (72) is provided on the disk surface of the locking disk (7), and a hook claw locking column (121) is provided at the handle end of the hook claw (12); when the locking disk (7) overlaps and covers the end surface of the positioning disk (9), the hook claw locking column (121) is inserted into the hook claw locking groove (72) to lock the position of the hook claw (12); The positioning plate (9) comprises a main plate body (91) and an extension arm (95); the main plate body (91) is annular, and the second center hole (94) is arranged at the center of the main plate body (91); a plurality of the extension arms (95) are arranged along a ring around the outer circumference of the main plate body (91); the extension arms (95) are provided with a nail threaded hole (96) and a hook claw mounting hole (92); the ejector screw rod (10) is threadedly connected to the rod threaded hole (93); the hook claw (12) extends into the hook claw mounting hole (92) and is connected to the extension arm (95) via a pin shaft (8); A plurality of hook mounting positions are arranged in each hook mounting hole (92), and the hook (12) can be mounted on different hook mounting positions, and the plurality of hook mounting positions are arranged along the radial direction of the positioning plate (9); The locking disk (7) is provided with a blind groove, and a plurality of hook claw locking grooves (72) are provided at the bottom of the blind groove. The plurality of hook claw locking grooves (72) are arranged along the radial direction of the locking disk (7); the positions of the hook claw locking grooves (72) correspond one to one with the positions of the hook claw installation positions; Alternatively, the locking disk (7) is provided with a blind groove, a curved hook locking groove (72) is provided at the bottom of the blind groove, and different arc segments of the hook locking groove (72) are respectively located at different diameter positions of the locking disk (7); the position of the hook locking groove (72) corresponds one-to-one to the position of the arc segment.

2. The disassembly tool for the grate sealing ring of the low-pressure turbine rotor according to claim 1 is characterized in that: The extension arm (95) and / or the main plate body (91) are provided with a nail threading hole (96), and the locking plate (7) is provided with a nail threading arc hole (73); when the connecting screw (6) passes through the nail threading arc hole (73) and is connected to the nail threading hole (96), the locking plate (7) and the positioning plate (9) can be fixedly connected.

3. The disassembly tool for the grate sealing ring of the low-pressure turbine rotor according to claim 2 is characterized in that: The locking disk (7) is also provided with a rod-penetrating arc hole (74) for the ejector screw (10) to pass through; the nail-penetrating arc hole (73) and the rod-penetrating arc hole (74) are both arc-shaped, and the arc centers of the nail-penetrating arc hole (73) and the rod-penetrating arc hole (74) coincide with the center of the locking disk (7).

4. The disassembly tool for the grate sealing ring of the low-pressure turbine rotor according to any one of claims 1 to 3, characterized in that: The disassembly tool also includes a gasket ring (11), which is arranged between the end of the ejection screw (10) and the low-pressure turbine rotor.

5. A method for disassembling a grate sealing ring of a low-pressure turbine rotor, characterized in that: Using the disassembly tool described in claim 4, the disassembly method includes the following steps: S1: Sleeve the gasket (11) onto the outside of the low-pressure turbine shaft (1) and abut against the turbine disk (3) of the low-pressure turbine rotor; S2: Sleeve the positioning plate (9) onto the outside of the low-pressure turbine shaft (1), and hook the hook (12) onto the edge of the comb tooth sealing ring (4); S3: Sleeve the locking plate (7) onto the outside of the low-pressure turbine shaft (1) and overlap it onto the positioning plate (9), so that the locking plate (7) locks the position of the hook claw (12), and use the connecting screws (6) to fix the locking plate (7) and the positioning plate (9); S4: Use the ejector screw (10) to pass through the locking plate (7) and the positioning plate (9) and abut against the gasket (11); tighten the ejector screw (10) and pull the comb tooth sealing ring (4) outward from the low-pressure turbine shaft (1).

Images