Anti-deformation expansion valve clamp for welding of gas turbine casing

Abstract

The utility model discloses a gas turbine casing welding anti-deformation expansion section clamp which comprises a bottom plate, a first annular groove, a second annular groove and a first hole. The positioning assembly is arranged on the top face of the bottom plate and located on the periphery of the second annular groove. The first fixing assembly is arranged on the top face of the bottom plate and located on the periphery of the first annular groove. The second fixing assembly is arranged on the top face of the bottom plate and located on the periphery of the second annular groove. The expansion valve assembly is arranged in the inner cylinder body; the cover plate is arranged above the bottom plate and is provided with a positioning hole, a third ring groove and a second hole; the third fixing assembly is arranged on the bottom face of the cover plate and located on the periphery of the third annular groove. The fourth fixing assembly is arranged on the bottom face of the cover plate and located on the periphery of the positioning hole. The clamp is convenient to install, good in positioning and supporting effect and capable of effectively avoiding the problem of deformation of the inner cylinder body caused by welding stress, and the machining quality of the gas turbine casing is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a part shape correcting technical field especially relates to a kind of expansion petal clamps for preventing deformation of gas turbine casing welding. BACKGROUND

[0002] As Figure 1 The gas turbine casing shown in the drawing is the important component of aeroengine, including inner cylinder and outer cylinder, several struts are evenly distributed between inner cylinder and outer cylinder along the circumference, and several structure holes are formed on the outer wall of outer cylinder. When the gas turbine casing is processed, the connecting part of the strut and the inner cylinder needs to be welded, and the inner cylinder is prone to deformation under the influence of welding stress. In order to ensure the processing quality of the gas turbine casing, a kind of expansion petal clamp for preventing deformation of gas turbine casing welding is designed to support the inner side of the inner cylinder, so as to prevent the problem of deformation of the inner cylinder caused by welding, and further ensure the processing quality of the gas turbine casing. UTILITY MODEL CONTENTS

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide an expansion petal clamp for preventing deformation of gas turbine casing welding, which is convenient to install, has good positioning and supporting effect, can effectively prevent the problem of deformation of the inner cylinder caused by welding stress, and ensures the processing quality of the gas turbine casing.

[0004] The utility model provides an expansion petal clamp for preventing deformation of gas turbine casing welding, which comprises:

[0005] A bottom plate is provided with a first ring groove on the top surface for positioning the bottom end of the inner cylinder; a second ring groove is provided on the top surface of the bottom plate concentrically outside the first ring groove for positioning the bottom end of the outer cylinder; a plurality of first type holes are evenly distributed on the bottom plate along the circumference between the first ring groove and the second ring groove;

[0006] A positioning assembly is arranged on the top surface of the bottom plate outside the second ring groove for positioning the angular direction of the outer cylinder;

[0007] A first fixing assembly is arranged on the top surface of the bottom plate outside the first ring groove for tightly fixing the bottom end of the inner cylinder;

[0008] A second fixing assembly is arranged on the top surface of the bottom plate outside the second ring groove for tightly fixing the bottom end of the outer cylinder;

[0009] An expansion petal assembly is arranged in the inner cylinder for tightly supporting the inner side of the inner cylinder;

[0010] A cover plate is arranged above the base plate, and a positioning hole is formed in the cover plate to position the top end of the inner cylinder body. A third ring groove is formed in the bottom surface of the cover plate concentrically outside the positioning hole to position the top end of the outer cylinder body. A plurality of second holes are uniformly distributed along the circumference of the cover plate between the positioning hole and the third ring groove.

[0011] A third fixing assembly is arranged on the bottom surface of the cover plate outside the third ring groove to press and fix the top end of the outer cylinder body.

[0012] A fourth fixing assembly is arranged on the bottom surface of the cover plate outside the positioning hole to press and fix the top end of the inner cylinder body.

[0013] Further, the positioning assembly includes a positioning seat and a positioning pin. A plurality of positioning seats are fixedly arranged on the top surface of the base plate outside the second ring groove. A pin hole is formed in each positioning seat corresponding to a structure hole on the side wall of the outer cylinder body. The positioning pin passes through the pin hole and is inserted into the corresponding structure hole. The outer diameter of one end of the positioning pin gradually decreases in the direction away from the positioning pin to form a guide head.

[0014] Further, the first fixing assembly includes a first pressing plate and a first screw. A plurality of first pressing plates are uniformly distributed outside the first ring groove. One end of each first pressing plate is pressed against the edge of the bottom end of the inner cylinder body, and the bottom of the other end of each first pressing plate is fixedly provided with a first pad. The first pressing plate is connected to the base plate by the first screw.

[0015] Further, the second fixing assembly includes a second pressing plate and a second screw. A plurality of second pressing plates are uniformly distributed outside the second ring groove. One end of each second pressing plate is pressed against the edge of the bottom end of the outer cylinder body, and the bottom of the other end of each second pressing plate is fixedly provided with a second pad. The second pressing plate is connected to the base plate by the second screw.

[0016] Further, the bulging petal assembly includes a support, a bulging petal, and a bulging core. An embedding groove is formed in the top surface of the base plate concentrically inside the first ring groove. The support is embedded in the embedding groove. A plurality of guide rails are uniformly distributed along the circumference of the top surface of the support. Each guide rail is arranged along the radial direction of the first ring groove. The top surface of the support is provided with a plurality of bulging petals corresponding to the guide rails. A sliding groove is formed in the bottom of each bulging petal corresponding to the guide rail. The cross section of each bulging petal is fan-shaped. The inner diameter of the hollow column surrounded by the bulging petals gradually decreases from top to bottom. The outer contour of the hollow column matches the inner contour of the inner cylinder body. The bulging core is in the shape of a circular truncated cone with the outer diameter gradually decreasing from top to bottom. The bulging core is embedded between the bulging petals.

[0017] Further, a type groove is formed in the top surface of the bulging core. A through hole is formed in the bottom of the type groove and communicates with the bottom end of the bulging core. A locking bolt passes through the through hole and is threadedly connected to the support.

[0018] Further, the top end of the expanding core is circumferentially distributed with a plurality of second lifting rings.

[0019] Further, the third fixing assembly comprises third pressing plates and third screws, the outer periphery of the third ring groove is uniformly distributed with a plurality of third pressing plates, one end of the third pressing plate is pressed on the bottom of the edge of the top end of the outer cylinder body, and the other end is provided with a third pad on the top, and the third pressing plate is connected with the cover plate through the third screw.

[0020] Further, the fourth fixing assembly comprises fourth pressing plates and fourth screws, the outer periphery of the positioning hole is uniformly distributed with a plurality of fourth pressing plates, one end of the fourth pressing plate is pressed on the bottom of the edge of the top end of the inner cylinder body, and the other end is provided with a fourth pad on the top, and the fourth pressing plate is connected with the cover plate through the fourth screw.

[0021] Further, the top surface of the bottom plate is located on the outer periphery of the second ring groove and is uniformly distributed with a plurality of first lifting rings.

[0022] Compared with the prior art, the clamps have the beneficial effects that:

[0023] The clamps of the utility model are provided with a bottom plate, a positioning assembly, a first fixing assembly, a second fixing assembly, an expanding petal assembly, a cover plate, a third fixing assembly and a fourth fixing assembly, when the inner cylinder body and the support of the gas turbine casing are welded, the gas turbine casing is positioned and fixed through the positioning assembly, the first fixing assembly, the second fixing assembly, the third fixing assembly and the fourth fixing assembly, then the inner side of the inner cylinder body is expanded and supported through the expanding petal assembly, at this time, the inner cylinder body and the support can be welded and connected. The clamps of the present application are convenient to install, have good positioning and supporting effects, can effectively avoid the problem that the welding stress causes the deformation of the inner cylinder body, and ensure the machining quality of the gas turbine casing.

[0024] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the utility model, nor is it intended to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the utility model will become more apparent through reading the detailed description of the non-limiting embodiments made by referring to the following drawings:

[0026] Figure 1 It is a structural schematic view of a gas turbine casing;

[0027] Figure 2 It is a structural schematic view of a shape correcting tool;

[0028] Figure 3Structure diagram of base plate;

[0029] Figure 4 Structure diagram of cover plate;

[0030] Figure 5 Structure diagram of bulge assembly;

[0031] Figure 6 Structure diagram of engine casing installed in the shape correcting tool;

[0032] Figure 7 Structure diagram of the cross section of the engine casing installed in the shape correcting tool.

[0033] Reference numerals in the drawing: 1, base plate; 2, positioning assembly; 3, first fixing assembly; 4, second fixing assembly; 5, bulge assembly; 6, cover plate; 7, third fixing assembly; 8, fourth fixing assembly; 9, engine casing;

[0034] 11, first ring groove; 12, second ring groove; 13, first shaped hole; 14, first lifting ring;

[0035] 21, positioning seat; 22, positioning pin; 23, pin hole; 24, guide head;

[0036] 31, first pressing plate; 32, first screw; 33, first cushion block;

[0037] 41, second pressing plate; 42, second screw; 43, second cushion block;

[0038] 51, support; 52, bulge; 53, bulging core; 54, guide rail; 55, sliding groove; 56, shaped groove; 57, through hole; 58, locking bolt; 59, second lifting ring;

[0039] 61, positioning hole; 62, third ring groove; 63, second shaped hole;

[0040] 71, third pressing plate; 72, third screw; 73, third cushion block;

[0041] 81, fourth pressing plate; 82, fourth screw; 83, fourth cushion block;

[0042] 91, inner cylinder; 92, outer cylinder; 93, support column; 94, structure hole. DETAILED DESCRIPTION

[0043] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for convenience of description.

[0044] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other in the case of no conflict.

[0045] Please refer to Figures 1-7 The embodiment of the utility model provides a kind of gas turbine nacelle welding anti-deformation bulging clamp, comprising:

[0046] Bottom plate 1, its top surface is provided with first ring groove 11, for the bottom end of inner cylinder 91 is positioned;Its top surface is provided with second ring groove 12 in the concentricity of the outer periphery of first ring groove 11, for the bottom end of outer cylinder 92 is positioned;First type hole 13 is uniformly distributed on the bottom plate 1 between first ring groove 11 and second ring groove 12 along the circumference;

[0047] Positioning assembly 2 is set to the top surface of bottom plate 1, is located in the outer periphery of second ring groove 12, for the angular direction of outer cylinder 92 is positioned;

[0048] First fixed component 3 is set to the top surface of bottom plate 1, is located in the outer periphery of first ring groove 11, for the bottom end of inner cylinder 91 is pressed tightly fixed;

[0049] Second fixed component 4 is set to the top surface of bottom plate 1, is located in the outer periphery of second ring groove 12, for the bottom end of outer cylinder 92 is pressed tightly fixed;

[0050] Bulging assembly 5 is set to inner cylinder 91, for the inside of inner cylinder 91 is expanded tightly supported;

[0051] Cover plate 6 is set to the top of bottom plate 1, is provided with positioning hole 61 on it, for the top end of inner cylinder 91 is positioned;Its bottom surface is provided with third ring groove 62 in the concentricity of the outer periphery of positioning hole 61, for the top end of outer cylinder 92 is positioned;Second type hole 63 is uniformly distributed on the cover plate 61 between positioning hole 61 and third ring groove 62 along the circumference;

[0052] Third fixed component 7 is set to the bottom surface of cover plate 6, is located in the outer periphery of third ring groove 62, for the top end of outer cylinder 92 is pressed tightly fixed;

[0053] Fourth fixed component 8 is set to the bottom surface of cover plate 6, is located in the outer periphery of positioning hole 61, for the top end of inner cylinder 91 is pressed tightly fixed.

[0054] In the embodiment, when clamping gas turbine nacelle, first, the bottom end of inner cylinder 91 is embedded in first ring groove 11, the bottom end is positioned, then the bottom end is preliminarily fixed by first fixed component 3, so that inner cylinder 91 can also rotate in first ring groove 11;

[0055] Then the bottom end of the outer cylinder 92 is embedded into the second ring groove 12, and the angular orientation thereof is positioned by the positioning assembly 2, and the bottom end thereof is tightly fixed by the second fixing assembly 4; at this time, the inner cylinder 91 is rotated to align the welding position thereof with the support 93, and the bottom end of the inner cylinder 91 is tightly fixed by the first fixing assembly 3;

[0056] Then the cover plate 6 is buckled on the top end of the inner cylinder 91 and the outer cylinder 92, the top end of the inner cylinder 91 is embedded into the positioning hole 61, and the top end of the outer cylinder 92 is embedded into the third ring groove, the top end of the inner cylinder 91 and the outer cylinder 92 is positioned respectively, and the top end of the outer cylinder 92 and the inner cylinder 91 is tightly fixed by the third fixing assembly 7 and the fourth fixing assembly 8 respectively;

[0057] Then the expansion assembly 5 is installed into the inner cylinder 91 to tightly support the inner side of the inner cylinder 91, at this time, the inner cylinder 91 and the support 93 can be welded and connected. Under the support of the expansion assembly 5, the problem that the welding stress causes the deformation of the inner cylinder 91 is effectively avoided. The jig of the application is convenient to install, has good positioning and support effect, and ensures the machining quality of the gas turbine casing.

[0058] In a preferred embodiment, as shown in Figure 3 and Figure 7 The positioning assembly 2 includes a positioning seat 21 and a positioning pin 22, and the top surface of the bottom plate 1 is fixedly provided with a plurality of positioning seats 21 on the outer periphery of the second ring groove 12, and the positioning seat 21 is provided with a pin hole 23 corresponding to the structure hole 94 on the side wall of the outer cylinder 92, the positioning pin 22 passes through the pin hole 23 and is inserted into the corresponding structure hole 94, and the outer diameter of one end of the positioning pin 22 gradually decreases in the direction away from the positioning pin 22 to form a guide head 24.

[0059] In this embodiment, when the angular orientation of the outer cylinder 92 is positioned, the bottom end thereof is first embedded into the second ring groove 12, then the outer cylinder 92 is rotated to align the structure hole 94 on the outer wall thereof with the corresponding pin hole 23, and then the positioning pin 22 is inserted into the corresponding structure hole 94 through the pin hole 23 one by one, so as to complete the positioning of the angular orientation of the outer cylinder 92, which is convenient to operate and accurate in positioning.

[0060] In a preferred embodiment, as shown in Figure 3 and Figure 7 The first fixing assembly 3 includes a first pressing plate 31 and a first screw 32, and the first ring groove 11 is uniformly provided with a plurality of first pressing plates 31, one end of the first pressing plate 31 is pressed on the edge of the bottom end of the inner cylinder 91, the other end is fixedly provided with a first pad 33 at the bottom, and the first pressing plate 31 is connected with the bottom plate 1 by the first screw 32.

[0061] In the embodiment, when fixing the bottom end of the inner cylinder 91, firstly, the bottom end is embedded into the first ring groove 11 for positioning, then one end of each first pressing plate 31 is pressed on the flange of the bottom end of the inner cylinder 91, and the other end is supported by the first pad 33, so that the first pressing plate 31 is kept horizontal, then the first pressing plate 31 is connected with the bottom plate 1 through the first screw 32, and the first screw 32 does not need to be tightened in the preliminary fixing, and after the welding part of the inner cylinder 91 is adjusted to be aligned with the support 93, each first screw 32 is tightened to press and fix the bottom end of the inner cylinder 91, which is convenient to operate and stable to fix.

[0062] In a preferred embodiment, as shown in Figure 3 and Figure 7 , the second fixing assembly 4 includes a second pressing plate 41 and a second screw 42, and the outer periphery of the second ring groove 12 is uniformly distributed with a plurality of second pressing plates 41, one end of the second pressing plate 41 is pressed on the edge of the bottom end of the outer cylinder 92, and the other end is fixedly provided with a second pad 43 at the bottom, and the second pressing plate 41 is connected with the bottom plate 1 through the second screw 42.

[0063] In the embodiment, when fixing the bottom end of the outer cylinder 92, firstly, the bottom end is embedded into the second ring groove 12 for positioning, and then the angular direction of the outer cylinder 92 is positioned by the positioning assembly 2. Then one end of each second pressing plate 41 is pressed on the flange of the bottom end of the outer cylinder 92, and the other end is supported by the second pad 43, so that the second pressing plate 41 is kept horizontal, then the second pressing plate 41 is connected with the bottom plate 1 through the second screw 42, and each second screw 42 is tightened to press and fix the bottom end of the outer cylinder 92, which is convenient to operate and stable to fix.

[0064] In a preferred embodiment, as shown in Figure 5 and Figure 7 , the expansion petal assembly 5 includes a support 51, an expansion petal 52 and an expansion core 53, an embedding groove is provided in the top surface of the bottom plate 1 in the first ring groove 11, the support 51 is embedded into the embedding groove, the top surface of the support 51 is uniformly distributed with a plurality of guide rails 54 in the circumferential direction, the guide rail 54 is arranged along the radial direction of the first ring groove 11, the top surface of the support 51 is provided with the expansion petal 52 corresponding to the guide rail 54, the bottom of the expansion petal 52 is provided with a sliding groove 55 corresponding to the guide rail 54, the cross section of the expansion petal 52 is fan-shaped, the inner diameter of the hollow column surrounded by each expansion petal 52 gradually decreases from top to bottom, the outer contour of the hollow column matches the inner contour of the inner cylinder 91, the expansion core 53 is in the shape of a circular truncated cone with the outer diameter gradually decreasing from top to bottom, and the expansion core 53 is embedded between the expansion petals 52.

[0065] In the embodiment, the support 51 is placed in the slot of the base plate 1, and each expansion lobe 52 is seated on the guide rail 54 on the top surface of the support 51 to form a sliding guide cooperation. Before use, each expansion lobe 52 is in a contracted state, which does not affect the installation of the inner cylinder 91 on the outer periphery of each expansion lobe 52. After the fixing and clamping of the gas turbine case 9 are completed, the inner side of the inner cylinder 91 is expanded and supported.

[0066] First, the expansion core 53 is inserted between each expansion lobe 52, and then the expansion core 53 is pressed down by the hydraulic equipment. The expansion core 53 extrudes each expansion lobe 52 to expand outward, and each expansion lobe 52 expands and supports the inner wall of the inner cylinder 91 from the inside. The operation is convenient, the supporting effect is good, the problem of deformation of the inner cylinder 91 caused by welding stress is effectively avoided, and the machining quality of the gas turbine case 9 is ensured.

[0067] Preferably, an avoiding groove is formed on the outer wall of the expansion lobe 52 corresponding to the welding position, so that the welding seam is avoided during welding to avoid the phenomenon of adhesion.

[0068] In a preferred embodiment, as shown in Figure 5 and Figure 7 the top surface of the expansion core 53 is provided with a type groove 56, the bottom of the type groove 56 is provided with a through hole 57 communicating with the bottom end of the expansion core 53, and the locking bolt 58 passes through the through hole 57 and is threadedly connected with the support 51.

[0069] In the embodiment, the type groove 56 reduces the weight of the expansion core 53 without affecting the structural strength of the expansion core 53. After the hydraulic equipment presses the expansion core 53 between each expansion lobe 52, the expansion core 53 is fixedly connected with the support 51 through the locking bolt 58, so as to ensure the stability of each expansion lobe 52 during welding.

[0070] In a preferred embodiment, as shown in Figure 4 and Figure 7 the top end of the expansion core 53 is circumferentially and uniformly provided with a plurality of second lifting rings 59. The weight of the expansion core 53 is large, and the second lifting rings 59 facilitate the lifting equipment to carry and lift the expansion core 53.

[0071] In a preferred embodiment, as shown in Figure 4 and Figure 7 the third fixing assembly 7 includes a third pressing plate 71 and a third screw 72. The outer periphery of the third ring groove 62 is uniformly provided with a plurality of third pressing plates 71. One end of the third pressing plate 71 is pressed on the bottom of the top end edge of the outer cylinder 92, and the other end is provided with a third pad 73 on the top. The third pressing plate 71 is connected with the cover plate 6 through the third screw 72.

[0072] In the embodiment, when fixing the top end of the outer cylinder 92, first embed the top end into the third ring groove 62 for positioning, then press one end of each third pressing plate 71 against the flange of the top end of the outer cylinder 92, and support the other end by the third pad 73, so that the third pressing plate 71 is kept horizontal, then connect the third pressing plate 71 with the cover plate 6 by the third screw 72, and tighten each third screw 72 to press and fix the top end of the outer cylinder 92, which is convenient to operate and stable to fix.

[0073] In a preferred embodiment, as shown in Figure 4 and Figure 7 , the fourth fixing assembly 8 comprises a fourth pressing plate 81 and a fourth screw 82, and the outer periphery of the positioning hole 61 is uniformly distributed with a plurality of fourth pressing plates 81, one end of the fourth pressing plate 81 is pressed against the bottom of the edge of the top end of the inner cylinder 91, and the other end is fixedly provided with a fourth pad 83 at the top, and the fourth pressing plate 81 is connected with the cover plate 6 by the fourth screw 82.

[0074] In the embodiment, when fixing the top end of the inner cylinder 91, first embed the top end into the positioning hole 61 for positioning, then press one end of each fourth pressing plate 81 against the flange of the top end of the inner cylinder 91, and support the other end by the fourth pad 83, so that the fourth pressing plate 81 is kept horizontal, then connect the fourth pressing plate 81 with the cover plate 6 by the fourth screw 82, and tighten each fourth screw 82 to press and fix the top end of the inner cylinder 91, which is convenient to operate and stable to fix.

[0075] In a preferred embodiment, as shown in Figure 2 and Figure 3 , the top surface of the bottom plate 1 is uniformly distributed with a plurality of first lifting rings 14 at the outer periphery of the second ring groove 12, which facilitates the lifting of the bottom plate 1.

[0076] In the description of the specification, the terms "connection", "mounting", "fixing" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] In the description of the specification, the terms "one embodiment", "some embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0078] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A combustion engine case welding deformation prevention bulge clamp characterized by, The utility model relates to a kind of positioning and fixing device for inner and outer cylinder, including: Bottom plate (1), the top surface of which is provided with a first ring groove (11) for positioning the bottom end of the inner cylinder (91); Its top surface is provided with a second ring groove (12) concentric with the outer periphery of the first ring groove (11) for positioning the bottom end of the outer cylinder (92);The bottom plate (1) is uniformly distributed with a plurality of first type holes (13) between the first ring groove (11) and the second ring groove (12) along the circumferential direction; Positioning assembly (2) is arranged on the top surface of the bottom plate (1) and located outside the second ring groove (12) for positioning the angular direction of the outer cylinder (92); First fixing assembly (3) is arranged on the top surface of the bottom plate (1) and located outside the first ring groove (11) for tightly fixing the bottom end of the inner cylinder (91); Second fixing assembly (4) is arranged on the top surface of the bottom plate (1) and located outside the second ring groove (12) for tightly fixing the bottom end of the outer cylinder (92); Expansion assembly (5) is arranged in the inner cylinder (91) for tightly supporting the inner side of the inner cylinder (91); Cover plate (6) is arranged above the bottom plate (1), and a positioning hole (61) is formed in the cover plate (6) for positioning the top end of the inner cylinder (91);The bottom surface of the cover plate (6) is provided with a third ring groove (62) concentric with the outer periphery of the positioning hole (61) for positioning the top end of the outer cylinder (92);The cover plate (6) is uniformly distributed with a plurality of second type holes (63) between the positioning hole (61) and the third ring groove (62) along the circumferential direction; Third fixing assembly (7) is arranged on the bottom surface of the cover plate (6) and located outside the third ring groove (62) for tightly fixing the top end of the outer cylinder (92); Fourth fixing assembly (8) is arranged on the bottom surface of the cover plate (6) and located outside the positioning hole (61) for tightly fixing the top end of the inner cylinder (91).

2. The combustor case weld distortion prevention bulge clamp of claim 1, wherein, The positioning assembly (2) comprises a positioning seat (21) and a positioning pin (22), and a plurality of positioning seats (21) are fixedly arranged on the top surface of the bottom plate (1) outside the second ring groove (12), a pin hole (23) is formed in each positioning seat (21) corresponding to a structure hole (94) on the side wall of the outer cylinder (92), the positioning pin (22) passes through the pin hole (23) and is inserted into the corresponding structure hole (94), and the outer diameter of one end of the positioning pin (22) gradually decreases in the direction away from the positioning pin (22) to form a guide head (24).

3. The combustor case weld distortion prevention bulge clamp of claim 1, wherein, The first fixing assembly (3) comprises a first pressing plate (31) and a first screw (32), and a plurality of first pressing plates (31) are uniformly distributed outside the first ring groove (11), one end of the first pressing plate (31) is pressed against the edge of the bottom end of the inner cylinder (91), a first cushion block (33) is fixedly arranged at the bottom of the other end of the first pressing plate (31), and the first pressing plate (31) is connected with the bottom plate (1) through the first screw (32).

4. The combustor case weld distortion prevention bulge clamp of claim 1, wherein, The second fixing assembly (4) comprises second pressing plates (41) and second screws (42), the outer periphery of the second ring groove (12) is uniformly distributed with a plurality of second pressing plates (41), one end of the second pressing plate (41) is pressed on the edge of the bottom end of the outer cylinder (92), the other end is fixedly provided with a second pad (43) at the bottom, and the second pressing plate (41) is connected with the bottom plate (1) through the second screw (42).

5. The combustor can weld bulge clamp of claim 1, wherein, The bulging assembly (5) comprises a support (51), a bulging piece (52) and a bulging core (53), the top surface of the bottom plate (1) is provided with an embedding groove in the concentric first ring groove (11), the support (51) is embedded in the embedding groove, the top surface of the support (51) is uniformly distributed with a plurality of guide rails (54) in the circumferential direction, the guide rail (54) is arranged along the radial direction of the first ring groove (11), the top surface of the support (51) is provided with the bulging piece (52) corresponding to the guide rail (54), the bottom of the bulging piece (52) is provided with a sliding groove (55) corresponding to the guide rail (54), the cross section of the bulging piece (52) is fan-shaped, the hollow column surrounded by each bulging piece (52) gradually decreases from top to bottom, and the outer contour of the hollow column matches the inner contour of the inner cylinder (91); the bulging core (53) is in the shape of a circular truncated cone with a gradually decreasing outer diameter from top to bottom, and the bulging core (53) is embedded between each bulging piece (52).

6. The combustor case weld distortion prevention bulge clamp of claim 5, wherein, The top surface of the bulging core (53) is provided with a type groove (56), the bottom of the type groove (56) is provided with a through hole (57) communicated to the bottom end of the bulging core (53), a locking bolt (58) passes through the through hole (57) and is threadedly connected with the support (51).

7. The combustor can weld distortion prevention bulge clamp of claim 6, wherein, The top end of the bulging core (53) is uniformly distributed with a plurality of second lifting rings (59) in the circumferential direction.

8. The combustor can weld bulge clamp of claim 1, wherein, The third fixing assembly (7) comprises third pressing plates (71) and third screws (72), the outer periphery of the third ring groove (62) is uniformly distributed with a plurality of third pressing plates (71), one end of the third pressing plate (71) is pressed on the bottom of the edge of the top end of the outer cylinder (92), the other end is fixedly provided with a third pad (73) at the top, and the third pressing plate (71) is connected with the cover plate (6) through the third screw (72).

9. The combustor can weld distortion prevention bulge clamp of claim 1, wherein, The fourth fixing assembly (8) comprises fourth pressing plates (81) and fourth screws (82), the outer periphery of the positioning hole (61) is uniformly distributed with a plurality of fourth pressing plates (81), one end of the fourth pressing plate (81) is pressed on the bottom of the edge close to the top end of the inner cylinder (91), the other end is fixedly provided with a fourth pad (83) at the top, and the fourth pressing plate (81) is connected with the cover plate (6) through the fourth screw (82).

10. The combustor can weld distortion prevention bulge clamp of claim 1, wherein, The top surface of the bottom plate (1) is uniformly distributed with a plurality of first lifting rings (14) in the outer periphery of the second ring groove (12).

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