A method for disassembling a bearing support casing of a gas turbine

Abstract

The present invention belongs to the technical field of gas turbine disassembly and assembly, and specifically relates to a method for disassembling a bearing pivot casing with a bearing of a gas turbine, comprising the following steps: S1: installing a positioning tool on the bearing pivot casing; the positioning tool is connected to a comb seal ring, an inner ring of a pivot bearing or a clamping nut to fix the relative position of the inner ring of the pivot bearing and the bearing pivot casing; S2: after fixing the compressor, the bearing pivot casing and the sealing bearing assembly are synchronously moved upward to synchronously disassemble the bearing pivot casing and the sealing bearing assembly from the compressor. In this solution, the pivot bearing is positioned and fixed by a positioning tool, and there is no need to disassemble the pivot bearing in advance, which effectively saves manpower and time and reduces the difficulty of disassembly; this solution fixes the pivot bearing by a positioning claw to protect the pivot bearing and reduce the risk of damage to the pivot bearing due to axial overload.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbine disassembly and assembly, and in particular relates to a method for disassembling a bearing support casing with a bearing of a gas turbine. Background Art

[0002] In the prior art, there are usually two ways to disassemble the gas turbine compressor in which the fulcrum bearing is directly mounted on the comb seal ring.

[0003] The first method is to directly pull out the bearing fulcrum casing together with the inner side of the grate seal ring. In this method, due to the connection between the front journal, the grate seal ring and the inner ring of the fulcrum bearing, the grate seal ring and the inner ring of the fulcrum bearing will be under a large axial force during the pulling out of the bearing fulcrum casing, which may cause damage to the fulcrum bearing in severe cases, affecting subsequent use.

[0004] The second method is to disassemble the grate seal ring, bearing and other parts first, and then disassemble the bearing fulcrum casing. However, the installation position of the grate seal ring and bearing is located deep in the bearing fulcrum casing, and the two parts are blocked by the bearing fulcrum casing, which makes disassembly difficult, laborious and time-consuming.

[0005] In order to protect the fulcrum bearing and save time and effort, it is necessary to design a new method for disassembling the bearing fulcrum casing and the bearing sealing assembly bearing fulcrum casing with bearings. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a method for disassembling a bearing fulcrum casing with a bearing of a gas turbine.

[0007] The technical solution adopted by the present invention is:

[0008] A method for disassembling a bearing support casing of a gas turbine with a bearing, wherein the gas turbine comprises a compressor and a bearing support casing; the compressor comprises a front journal, and a sealed bearing assembly is arranged between the bearing support casing and the front journal;

[0009] The sealing bearing assembly includes a comb teeth sealing ring, a fulcrum bearing, a clamping nut and a bearing seat; the comb teeth sealing ring is sleeved on the outside of the front journal and transitionally matched with the front journal; the inner ring of the fulcrum bearing is fixedly connected to the comb teeth sealing ring, and the outer ring of the fulcrum bearing is fixedly connected to the bearing seat; the bearing seat is fixedly connected to the bearing fulcrum casing; the clamping nut is threadedly connected to the comb teeth sealing ring and axially presses against the inner ring of the fulcrum bearing;

[0010] The method for disassembling the bearing pivot casing with bearing comprises the following steps:

[0011] S1: Fixing and connecting a positioning tool on the bearing fulcrum casing; connecting the positioning tool with the comb seal ring, the inner ring of the fulcrum bearing or the clamping nut, so that the inner ring of the fulcrum bearing and the bearing fulcrum casing remain in a relatively static state;

[0012] S2: After the compressor is fixed, the bearing support casing and the sealing bearing assembly are synchronously moved upward to synchronously detach the bearing support casing and the sealing bearing assembly from the compressor.

[0013] As an alternative or supplement to the above method: the positioning tooling includes a locking screw, a positioning pull plate, a positioning nut and a plurality of positioning pull claws; the locking screw passes through the edge of the positioning pull plate and fixes the positioning pull plate to the bearing fulcrum casing; the positioning nut connected to the upper end of the positioning pull claw abuts against the positioning pull plate, and the lower end of the positioning pull claw is connected to the comb tooth sealing ring, the inner ring of the fulcrum bearing or the clamping nut.

[0014] As an alternative or supplement to the above method: the positioning claw includes an external thread section, a pulling arm section and a transverse folding hook section; the external thread section passes through the positioning pull plate and is threadedly connected to the positioning nut; the positioning nut abuts against the upper end surface of the positioning pull plate; the pulling arm section is connected between the external thread section and the transverse folding hook section, and the transverse folding hook section is connected to the comb tooth sealing ring, the inner ring of the fulcrum bearing or the clamping nut.

[0015] As an alternative or supplement to the above method: a hook-locking ring groove is provided on the outer side wall of the inner ring of the fulcrum bearing, and a hook portion is provided on the transverse hook section, and the hook portion can hook the groove edge of the hook-locking ring groove.

[0016] As an alternative or supplement to the above method: the transverse folded hook section is bent toward the radial outside of the comb tooth sealing ring; when disassembled, the transverse folded hook section extends to the inner side of the bearing seat, and the outer side of the transverse folded hook section or the pulling arm section abuts against the bearing seat.

[0017] As an alternative or supplement to the above method: the positioning tool also includes an ejector screw and an ejector plate, the ejector plate abuts against the end of the front journal, the ejector screw is threadedly connected to the positioning pull plate and abuts against the ejector plate to push the positioning pull plate away from the compressor.

[0018] As an alternative or supplement to the above method: a positioning blind hole is provided in the middle of the upper end surface of the ejector plate, and the end of the ejector screw is inserted into the positioning blind hole.

[0019] As an alternative or supplement to the above method: an alignment ring groove is provided on the edge of the lower end surface of the ejector plate, the front journal is tubular, and the alignment ring groove is engaged with the pipe opening of the front journal.

[0020] As an alternative or supplement to the above method: the bearing fulcrum casing includes a fulcrum inner casing, a fulcrum outer casing and an inner support plate; the fulcrum inner casing is arranged in the fulcrum outer casing; the inner support plate is conical ring-shaped, and the large end of the inner support plate is fixedly connected to one end of the fulcrum inner casing; the positioning pull plate is fixed to the other end of the fulcrum outer casing; the sealing bearing assembly is fixed to the small end of the inner support plate.

[0021] As an alternative or supplement to the above method: a compressor casing is arranged below the bearing fulcrum casing, and the compressor casing includes a compressor outer casing and a compressor inner casing; when the bearing fulcrum casing is connected to the compressor casing, the compressor outer casing is connected to the fulcrum outer casing, and the compressor inner casing is connected to the fulcrum inner casing.

[0022] The beneficial effects of the present invention are:

[0023] 1. In this solution, the fulcrum bearing is positioned and fixed by the positioning tool, and there is no need to disassemble the fulcrum bearing in advance, which saves manpower and time and reduces the difficulty of disassembly;

[0024] 2. In addition, this solution fixes the fulcrum bearing by positioning the claws, which can offset the axial force of the fulcrum bearing, protect the fulcrum bearing, and reduce the risk of damage to the fulcrum bearing due to axial overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 This is a cross-sectional structural diagram of the bearing fulcrum casing;

[0027] Figure 2 It is a partial structural diagram of the sealing bearing assembly;

[0028] Figure 3 This is a diagram showing the installation status of the positioning tooling;

[0029] Figure 4 It is a structural schematic diagram of the positioning claw;

[0030] Figure 5 It is a structural schematic diagram of the ejector plate.

[0031] In the figure: 1-front journal; 2-bearing fulcrum casing; 21-fulcrum inner casing; 22-fulcrum outer casing; 23-inner support plate; 3-positioning fixture; 31-locking screw; 32-positioning nut; 33-ejection screw; 34-positioning pull plate; 35-positioning pull claw; 351-external thread section; 352-pulling arm section; 353-lateral hook section; 354-hook; 36-ejection plate; 361-alignment ring groove; 362-internal thread hole; 363-positioning blind hole; 4-sealed bearing assembly; 41-comb tooth sealing ring; 42-fulcrum bearing; 43-pressing nut; 44-bearing seat; 5-compressor casing; 51-compressor outer casing; 52-compressor inner casing. DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1

[0034] like Figure 1 to Figure 2 As shown, the gas turbine includes components such as a compressor, a bearing support casing 2 and a sealing bearing assembly 4.

[0035] The bearing fulcrum casing 2 includes components such as a fulcrum inner casing 21, a fulcrum outer casing 22 and an inner support plate 23. The fulcrum outer casing 22 is in the shape of a circular ring or a conical ring. The fulcrum inner casing 21 is coaxially arranged in the fulcrum outer casing 22, and a channel for airflow is formed between the fulcrum inner casing 21 and the fulcrum outer casing 22; a radial support member is connected between the fulcrum inner casing 21 and the fulcrum outer casing 22 to achieve relative fixation of the fulcrum inner casing 21 and the fulcrum outer casing 22. The inner support plate 23 is in the shape of a conical ring, and the large end of the inner support plate 23 is fixedly connected to the lower end of the fulcrum inner casing 21 by screws. The sealing bearing assembly 4 is fixed to the small end of the inner support plate 23.

[0036] The compressor casing 5 is arranged at the lower end of the bearing fulcrum casing 2, and the compressor casing 5 includes a compressor outer casing 51 and a compressor inner casing 52; when the bearing fulcrum casing 2 is connected to the compressor casing 5, the compressor outer casing 51 is connected to the lower end of the fulcrum outer casing 22, and the compressor inner casing 52 is connected to the lower end of the fulcrum inner casing 21. The compressor casing 5 is located outside the compressor of the gas turbine.

[0037] The compressor comprises a front journal 1 which is a hollow tubular structure.

[0038] The sealing bearing assembly 4 is arranged between the bearing fulcrum casing 2 and the front journal 1. The sealing bearing assembly 4 includes a comb seal ring 41, a fulcrum bearing 42, a clamping nut 43, a bearing seat 44 and other components; the comb seal ring 41 is sleeved on the outside of the front journal 1 and transitionally matched with the front journal 1. The transitional matching surface K is shown in FIG. Figure 2 ; The inner ring of the fulcrum bearing 42 is fixedly connected to the comb teeth sealing ring 41, and the outer ring of the fulcrum bearing 42 is fixedly connected to the bearing seat 44; the bearing seat 44 is fixedly connected to the bearing fulcrum casing 2; the clamping nut 43 is threadedly connected to the comb teeth sealing ring 41 and axially presses against the upper end surface of the inner ring of the fulcrum bearing 42.

[0039] This embodiment provides a method for disassembling a bearing support casing with a bearing of a gas turbine, comprising the following steps:

[0040] S1: Install a positioning fixture 3 on the bearing fulcrum casing 2; the positioning fixture 3 is connected to the comb seal ring 41, the inner ring of the fulcrum bearing 42 or the clamping nut 43, so that the inner ring of the fulcrum bearing 42 and the bearing fulcrum casing 2 remain in a relatively static state;

[0041] S2: After the compressor is fixed, the bearing support casing 2 and the sealing bearing assembly 4 are synchronously moved upward to synchronously detach the bearing support casing 2 and the sealing bearing assembly 4 from the compressor.

[0042] In this embodiment, the positioning tool 3 is used to position and fix the pivot bearing 42, and the pivot bearing 42 does not need to be disassembled in advance, which effectively saves manpower and time and reduces the difficulty of disassembly. In addition, due to the positioning of the positioning tool 3, the dislocation tendency of the inner and outer ring brackets of the pivot bearing 42 can be offset, thereby protecting the pivot bearing 42 and reducing the risk of damage to the pivot bearing 42 due to axial overload.

[0043] Example 2

[0044] like Figures 1 to 5 As shown, the positioning tool 3 in Example 1 can adopt the structure in this embodiment.

[0045] The positioning fixture 3 of this embodiment includes components such as a locking screw 31 , a positioning pull plate 34 , a positioning nut 32 , and a plurality of positioning pull claws 35 .

[0046] The positioning plate 34 is in the shape of a hollow disc and is fixed to the upper end of the fulcrum outer casing 22 . Specifically, a locking screw 31 passes through the edge of the positioning plate 34 to fix the positioning plate 34 to the bearing fulcrum casing 2 via the locking screw 31 .

[0047] The upper end of the positioning claw 35 is against the positioning plate 34 through the positioning nut 32, and the lower end of the positioning claw 35 is connected to the comb seal ring 41, the inner ring of the fulcrum bearing 42 or the clamping nut 43 to position the inner ring of the fulcrum bearing 42. Specifically: the positioning claw 35 includes an external thread section 351, a pull arm section 352 and a transverse folding hook section 353; wherein the external thread section 351 passes through the hole on the positioning plate 34 and is threadedly connected to the positioning nut 32; the positioning nut 32 abuts against the upper end surface of the positioning plate 34, thereby providing an upward pulling force for the positioning claw 35; the pull arm section 352 is in an arc shape, and the pull arm section 352 is connected between the external thread section 351 and the transverse folding hook section 353; the transverse folding hook section 353 has multiple bending sections to bypass the bearing seat 44, the front journal 1, the comb teeth sealing ring 41, the clamping nut 43 and other components, and extend into the gap between these components. A hook portion 354 is provided at the lower end of the transverse folding hook section 353, and when a hook lock ring groove cooperating with the hook portion 354 is provided on the outer side wall of the inner ring of the fulcrum bearing 42, the hook portion 354 can hook the groove edge of the hook lock ring groove.

[0048] The transverse hook section 353 is bent toward the radial outer side of the comb teeth sealing ring 41; when disassembled, the transverse hook section 353 extends to the inner side of the bearing seat 44 and is placed between the comb teeth sealing ring 41 and the bearing seat 44, and the outer side of the transverse hook section 353 or the arm section 352 abuts against the upper end of the bearing seat 44 extending upward. The hook portion 354, the contact point between the transverse hook section 353 or the arm section 352 and the bearing seat 44, and the upper end of the positioning claw 35 can serve as three fulcrums with the positioning claw 35 as a lever, so that when the upper end of the positioning claw 35 moves radially outward, the hook portion 354 can gather and be more tightly hooked into the hook lock ring groove, thereby ensuring the connection strength between the positioning claw 35 and the comb teeth sealing ring 41, the inner ring of the fulcrum bearing 42, or the clamping nut 43 and other components.

[0049] Example 3

[0050] Based on the structure of Example 2, Figures 1 to 5 As shown, after the positioning tool 3 fixes and seals the bearing assembly 4, the bearing fulcrum casing 2 can be disassembled; during disassembly, the bearing fulcrum casing 2 can be lifted by a lifting tool connected to the positioning pull plate 34 or the bearing fulcrum casing 2.

[0051] In addition, the following structural form may also be adopted: components such as the ejection screw 33 and the ejection plate 36 are integrated on the positioning fixture 3 .

[0052] The ejector plate 36 abuts against the end of the front journal 1, and a positioning blind hole 363 is provided in the middle of the upper end surface of the ejector plate 36, and the end of the ejector screw 33 is inserted into the positioning blind hole 363. The edge of the lower end surface of the ejector plate 36 is provided with a positioning ring groove 361, and the front journal 1 is tubular, and the positioning ring groove 361 is fitted with the pipe opening of the front journal 1.

[0053] The ejection screw 33 is threadedly connected to the positioning pull plate 34 and abuts against the ejection plate 36. When a wrench is used to rotate the ejection screw 33, the bearing fulcrum casing 2 can be ejected.

[0054] 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 method for disassembling a bearing support casing of a gas turbine, characterized in that: The gas turbine comprises a compressor and a bearing support casing (2); the compressor comprises a front journal (1), and a sealed bearing assembly (4) is arranged between the bearing support casing (2) and the front journal (1); The sealing bearing assembly (4) comprises a comb-tooth sealing ring (41), a pivot bearing (42), a clamping nut (43) and a bearing seat (44); the comb-tooth sealing ring (41) is sleeved on the outside of the front shaft neck (1) and transitionally matched with the front shaft neck (1); the inner ring of the pivot bearing (42) is fixedly connected to the comb-tooth sealing ring (41), and the outer ring of the pivot bearing (42) is fixedly connected to the bearing seat (44); the bearing seat (44) is fixedly connected to the bearing pivot casing (2); the clamping nut (43) is threadedly connected to the comb-tooth sealing ring (41) and axially presses against the inner ring of the pivot bearing (42); The method for disassembling the bearing pivot casing with bearing comprises the following steps: S1: fixing and connecting a positioning tool (3) on the bearing fulcrum casing (2); connecting the positioning tool (3) with the comb seal ring (41), the inner ring of the fulcrum bearing (42) or the clamping nut (43), so that the inner ring of the fulcrum bearing (42) and the bearing fulcrum casing (2) remain in a relatively static state; S2: After the compressor is fixed, the bearing support casing (2) and the sealing bearing assembly (4) are synchronously moved upward to synchronously detach the bearing support casing (2) and the sealing bearing assembly (4) from the compressor; The positioning tool (3) comprises a locking screw (31), a positioning plate (34), a positioning nut (32) and a plurality of positioning claws (35); the locking screw (31) passes through the edge of the positioning plate (34) and fixes the positioning plate (34) to the bearing fulcrum casing (2); the positioning nut (32) connected to the upper end of the positioning claw (35) abuts against the positioning plate (34), and the lower end of the positioning claw (35) is connected to the comb tooth sealing ring (41), the inner ring of the fulcrum bearing (42) or the clamping nut (43); The positioning claw (35) comprises an external thread section (351), a pull arm section (352) and a transverse folding hook section (353); the external thread section (351) passes through the positioning pull plate (34) and is threadedly connected to the positioning nut (32); the positioning nut (32) abuts against the upper end surface of the positioning pull plate (34); the pull arm section (352) is connected between the external thread section (351) and the transverse folding hook section (353), and the transverse folding hook section (353) is connected to the comb teeth sealing ring (41), the inner ring of the fulcrum bearing (42) or the clamping nut (43); A hook-locking ring groove is provided on the outer side wall of the inner ring of the fulcrum bearing (42), and a hook portion (354) is provided on the transverse folding hook section (353), and the hook portion (354) can hook the groove edge of the hook-locking ring groove; The transverse folded hook section (353) is bent toward the radial outer side of the comb tooth sealing ring (41); when disassembled, the transverse folded hook section (353) extends to the inner side of the bearing seat (44), and the outer side of the transverse folded hook section (353) or the pulling arm section (352) abuts against the bearing seat (44).

2. The method for disassembling a bearing support casing of a gas turbine according to claim 1, characterized in that: The positioning tool (3) further comprises an ejector screw (33) and an ejector plate (36), wherein the ejector plate (36) abuts against the end of the front journal (1), and the ejector screw (33) is threadedly connected to the positioning pull plate (34) and abuts against the ejector plate (36) to push the positioning pull plate (34) away from the compressor.

3. The method for disassembling a bearing support casing of a gas turbine according to claim 2, characterized in that: A positioning blind hole (363) is provided in the middle of the upper end surface of the ejection plate (36), and the end of the ejection screw (33) is inserted into the positioning blind hole (363).

4. The method for disassembling a bearing support casing of a gas turbine according to claim 3, characterized in that: An alignment ring groove (361) is provided at the edge of the lower end surface of the ejection plate (36); the front journal (1) is tubular, and the alignment ring groove (361) is fitted into the pipe opening of the front journal (1).

5. The method for disassembling a bearing support casing of a gas turbine according to claim 1, characterized in that: The bearing fulcrum casing (2) comprises an inner fulcrum casing (21), an outer fulcrum casing (22) and an inner support plate (23); the inner fulcrum casing (21) is arranged in the outer fulcrum casing (22); the inner support plate (23) is in a conical ring shape, and the large end of the inner support plate (23) is fixedly connected to one end of the inner fulcrum casing (21); the positioning pull plate (34) is fixed to the other end of the outer fulcrum casing (22); and the sealing bearing assembly (4) is fixed to the small end of the inner support plate (23).

6. The method for disassembling a bearing support casing of a gas turbine according to claim 5, characterized in that: A compressor casing (5) is arranged below the bearing fulcrum casing (2), and the compressor casing (5) comprises a compressor outer casing (51) and a compressor inner casing (52); when the bearing fulcrum casing (2) is connected to the compressor casing (5), the compressor outer casing (51) is connected to the fulcrum outer casing (22), and the compressor inner casing (52) is connected to the fulcrum inner casing (21).

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