Connecting pipe diffusion cylinder assembling method and tool

Abstract

The assembling method comprises the following steps of manufacturing an outer diffusion barrel welding tool and an inner diffusion barrel welding tool, blanking an outer barrel body of a connecting pipe outer diffusion barrel, blanking an inner barrel body of a connecting pipe inner diffusion barrel, welding the connecting pipe outer diffusion barrel, welding the connecting pipe inner diffusion barrel, installing an outer heat insulation layer and installing an inner heat insulation layer. The connecting pipe outer diffusion cylinder is installed on the outer side of the interior of the carbon steel body, the wing-shaped body is arranged on the supporting part of the carbon steel body in a sleeving mode, the middle of the inner cylinder body is cut into two halves in the radial direction, and the connecting pipe inner diffusion cylinder is installed on the inner side of the interior of the carbon steel body. By means of the method and the tool, the assembly size of the connecting pipe outer diffusion cylinder and the connecting pipe inner diffusion cylinder is guaranteed, welding deformation is controlled, the connecting pipe outer diffusion cylinder and the connecting pipe inner diffusion cylinder can be conveniently and smoothly wrapped on a carbon steel body, and the drawing design requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine manufacturing, and in particular to an assembly method and tooling for a pipe diffuser. Background Art

[0002] See also Figure 1 The gas turbine exhaust nozzle comprises a carbon steel body 10 and components such as an outer nozzle diffuser 20, an inner nozzle diffuser 30, and an airfoil 40, mounted within the carbon steel body 10. The carbon steel body 10 is divided into two halves by a half. The outer nozzle diffuser 20 is wrapped around the inner side of the carbon steel body 10, while the inner nozzle diffuser 30 is wrapped around the outer side of the inner side of the carbon steel body 10. The airfoil 40 is supported and wrapped around the outer nozzle diffuser 20 and the inner nozzle diffuser 30. To ensure that the outer nozzle diffuser 20 and the inner nozzle diffuser 30 can be smoothly wrapped around the carbon steel body 10 and meet the design requirements of the drawings, we have proposed a nozzle diffuser assembly method and tooling. Summary of the Invention

[0003] In order to solve the current technical problems, the main purpose of the present invention is to provide a method and tooling for assembling a diffuser tube, which can easily and smoothly cover the outer diffuser tube and the inner diffuser tube on the carbon steel body and meet the design requirements of the drawings.

[0004] In order to overcome the problems existing in the prior art, the technical solution adopted by the present invention is: a method for assembling a pipe diffuser, comprising the following steps: S1. Make welding tooling for outer diffuser and inner diffuser; S2, unloading the outer cylinder of the connecting pipe outer diffuser; S3, unloading the inner cylinder of the diffuser tube; S4. Welding the outer diffuser front flange and the outer diffuser rear flange at both ends of the outer diffuser body using the outer diffuser welding tool; S5. Welding the inner diffuser front flange and the inner diffuser rear flange at both ends of the inner diffuser body using the inner diffuser welding tool; S6. Install an outer insulation layer on the outer wall of the outer cylinder, and install an inner insulation layer on the inner wall of the inner cylinder; S7. Open an airfoil-shaped notch on the outer cylinder and install the diffuser tube to the outside of the carbon steel body; S8. Fit the airfoil onto the supporting portion of the carbon steel body, and weld one end of the airfoil to the corresponding airfoil notch on the outer cylinder; S9. Open an airfoil notch on the inner cylinder and radially cut the middle of the inner cylinder into two halves. Install the diffuser tube inside the carbon steel body and weld the other end of the airfoil to the corresponding airfoil notch on the inner cylinder.

[0005] In S2, the material constituting the outer cylinder includes a first curved plate and a second curved plate. When the first curved plate and the second curved plate are cut, an airfoil outer end mark and a first positioning pin mark are respectively engraved on the first curved plate and the second curved plate.

[0006] In S3 , the inner cylinder material is blanked, and an airfoil inner end mark, a second positioning pin mark, and a dividing line are engraved on the inner cylinder material.

[0007] In S4, the first curved plate is surrounded on the outer upper side of the outer diffuser tube welding tooling, the second curved plate is surrounded on the outer lower side of the outer diffuser tube welding tooling, and multiple connecting plates are welded inside the outer diffuser tube welding tooling, and the connecting plates are spot welded to the inner walls of the first curved plate and the second curved plate; the front flange of the outer diffuser tube is mounted on the top outer side of the outer diffuser tube welding tooling, the upper end of the first curved plate is welded to the front flange of the outer diffuser tube, the rear flange of the outer diffuser tube is mounted on the bottom outer side of the outer diffuser tube welding tooling, and the lower end of the second curved plate is welded to the rear flange of the outer diffuser tube.

[0008] In S5, the cut material is rolled back and placed inside the inner diffuser tube welding fixture, the front flange of the inner diffuser tube is installed to the inner side of the top of the inner diffuser tube welding fixture, and the rear flange of the inner diffuser tube is installed to the inner side of the bottom of the inner diffuser tube welding fixture. Then, the front flange of the inner diffuser tube and the rear flange of the inner diffuser tube are welded to the two ends of the inner cylinder body respectively.

[0009] In S6, the first positioning pins are welded to the outer walls of the first curved plate and the second curved plate according to the first positioning pin marks, the outer thermal insulation layer is fitted onto the first positioning pins through the mounting holes, and then the first limiting member is installed on the first positioning pins to fix the outer thermal insulation layer to the outer cylinder; the second positioning pins are welded to the inner wall of the inner cylinder according to the second positioning pin marks, the inner thermal insulation layer is fitted onto the second positioning pins through the mounting holes, and then the second limiting member is installed on the second positioning pins to fix the inner thermal insulation layer to the inner cylinder.

[0010] In S7, a hole is opened along the outer end mark of the airfoil body to form an airfoil body notch, and the front and rear halves of the outer cylinder are respectively inserted into the outer side of the carbon steel body from the front and rear ends of the carbon steel body, and the front and rear halves of the outer cylinder are welded and fixed.

[0011] In S9, an airfoil notch is marked along the inner end of the airfoil body, and the inner cylinder is radially cut into two halves along the dividing line. The two halves are respectively inserted into the inner side of the carbon steel body from the front and rear ends of the carbon steel body. The two halves of the inner cylinder are first welded and fixed, and then the airfoil body and the inner cylinder are welded.

[0012] A welding tool for an outer diffuser tube used in the assembly method of the connected diffuser tube, the outer diffuser tube welding tool comprising a first frustum ring portion and a second frustum shaped portion, the tapers of the outer walls of the first frustum ring portion and the second frustum shaped portion being different, the first frustum ring portion and the second frustum shaped portion being detachably connected by bolts; the first frustum ring portion and the second frustum shaped portion respectively comprising a plurality of support rings with different outer diameters, the upper and lower support rings being welded and fixed by a first rib plate.

[0013] A welding fixture for an inner diffuser tube used in the assembly method of the connected diffuser tube, the welding fixture for the inner diffuser tube comprising a first semi-ring portion and a second semi-ring portion, the first semi-ring portion and the second semi-ring portion being detachably connected by bolts; the first semi-ring portion and the second semi-ring portion each comprising a plurality of semi-rings, the upper and lower semi-rings being welded and fixed by a second rib plate.

[0014] The present invention has the following beneficial effects: The method and device of the present invention ensure the assembly dimensions of the outer diffuser tube and the inner diffuser tube and control welding deformation, which not only allows the outer diffuser tube and the inner diffuser tube to be conveniently and smoothly covered on the carbon steel body, but also meets the design requirements of the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the gas turbine exhaust pipe.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the diffuser outside the takeover tube.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the diffuser tube in the pipe.

[0019] Figure 4 A schematic plan view of the first curved plate and the second curved plate when blanking the outer cylinder.

[0020] Figure 5 This is a planar schematic diagram of the inner cylinder material when cutting the inner cylinder.

[0021] Figure 6 This is a schematic diagram of positioning, calibrating, and welding the outer diffuser outside the welding fixture.

[0022] Figure 7It is a schematic cross-sectional structural diagram of the outer diffuser tube welding tooling of the present invention.

[0023] Figure 8 This is a schematic diagram of the positioning, correction and welding of the inner cylinder inside the inner diffuser welding tooling.

[0024] Figure 9 It is a schematic cross-sectional structural diagram of the inner diffuser tube welding tooling of the present invention.

[0025] Figure 10 It is a schematic top view of the structure of the inner diffuser tube welding tooling of the present invention.

[0026] Reference numerals: Carbon steel body 10; Connect the outer diffuser 20, outer cylinder 21, first curved plate 211, second curved plate 212, outer end mark 213 of the airfoil, first positioning pin mark 214, outer diffuser front flange 22, outer diffuser rear flange 23, outer thermal insulation layer 24, first positioning pin 25, and first stopper 26; Connecting pipe inner diffuser 30, inner cylinder 31, inner cylinder material 311, airfoil inner end mark 313, second locating pin mark 314, dividing line 315, inner diffuser front flange 32, inner diffuser rear flange 33, inner insulation layer 34, second locating pin 35, second stopper 36; airfoil body 40; Outer diffuser welding fixture 50, first truncated cone ring portion 51, second truncated cone portion 52, connecting plate 501, supporting ring 502, first rib plate 503; Inner diffuser welding fixture 60 , first semi-ring portion 61 , second semi-ring portion 62 , semi-ring 601 , second rib plate 602 . DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Example 1: See also Figures 1 to 10 This embodiment provides a method for assembling a diffuser tube, including the following steps: S1. Produce an outer diffuser tube welding tool 50 and an inner diffuser tube welding tool 60.

[0030] S2, unloading the outer cylinder 21 of the outer diffuser 20; S3, unloading the inner cylinder 31 of the inner diffuser 30; S4. Welding the outer diffuser front flange 22 and the outer diffuser rear flange 23 at both ends of the outer cylinder 21 using the outer diffuser welding tool 50; S5. Welding the inner diffuser front flange 32 and the inner diffuser rear flange 33 at both ends of the inner cylinder 31 using the inner diffuser welding tool 60; S6. Install an outer heat insulation layer 24 on the outer wall of the outer cylinder 21 and an inner heat insulation layer 34 on the inner wall of the inner cylinder 31; S7. Open an airfoil-shaped notch on the outer cylinder 21 and install the outer diffuser 20 to the outside of the carbon steel body 10; S8. Fit the airfoil shaped body 40 onto the supporting portion of the carbon steel body 10 , and weld one end of the airfoil shaped body 40 to the corresponding airfoil shaped body notch on the outer cylinder 21 ; S9. Open an airfoil notch on the inner cylinder 31 and radially cut the middle part of the inner cylinder 31 into two halves. Install the diffuser tube 30 inside the connecting pipe to the inner side of the carbon steel body 10. Weld the other end of the airfoil 40 to the corresponding airfoil notch on the inner cylinder 31.

[0031] Through the above steps, the assembly dimensions of the outer diffuser 20 and the inner diffuser 30 are guaranteed and the welding deformation is controlled, so that the outer diffuser 20 and the inner diffuser 30 can be easily and smoothly covered on the carbon steel body 10 and meet the design requirements of the drawings.

[0032] Specifically, in S2, see Figure 4 The outer cylinder 21 is composed of a first curved plate 211 and a second curved plate 212. During blanking, an airfoil outer end mark 213 and a first locating pin mark 214 are engraved on the first curved plate 211 and the second curved plate 212, respectively. The airfoil outer end mark 213 is used to create the airfoil notch, while the first locating pin mark 214 is used to position the first locating pin 25 for welding. This improves the accuracy of the first locating pin 25 welding position, facilitating the subsequent installation of the outer thermal insulation layer 24.

[0033] In S3, see Figure 5 , cut the inner cylinder material 311 for the inner cylinder 31, and carve the airfoil body inner end mark 313, the second positioning pin mark 314 and the dividing line 315 on the inner cylinder material 311. The airfoil body inner end mark 313 is used to excavate the airfoil body gap, the second positioning pin mark 314 is used for positioning the second positioning pin 35 for welding, and the dividing line 315 is used for positioning when cutting the diffuser cylinder 30 in the connecting pipe.

[0034] In S4, see Figure 6 , surround the first curved plate 211 to the outer upper side of the outer diffuser welding tool 50, surround the second curved plate 212 to the outer lower side of the outer diffuser welding tool 50, weld multiple connecting plates 501 inside the outer diffuser welding tool 50, and spot weld the connecting plates 501 to the inner walls of the first curved plate 211 and the second curved plate 212; the outer diffuser front flange 22 is mounted on the top outer side of the outer diffuser welding tool 50, weld the upper end of the first curved plate 211 to the outer diffuser front flange 22, mount the outer diffuser rear flange 23 on the bottom outer side of the outer diffuser welding tool 50, weld the lower end of the second curved plate 212 to the outer diffuser rear flange 23, and do not weld between the first curved plate 211 and the second curved plate 212.

[0035] In S5, see Figure 8 , rewind the cut material and place it inside the inner diffuser tube welding tool 60, install the inner diffuser tube front flange 32 to the top inner side of the inner diffuser tube welding tool 60, install the inner diffuser tube rear flange 33 to the bottom inner side of the inner diffuser tube welding tool 60, and then weld the inner diffuser tube front flange 32 and the inner diffuser tube rear flange 33 to the two ends of the inner cylinder body 31 respectively.

[0036] In S6, see Figure 2 First locating pins 25 are welded to the outer walls of the first and second curved plates 211, 212, according to the first locating pin markings 214. The outer thermal insulation layer 24 is then fitted onto the first locating pins 25 through the mounting holes. First stoppers 26 are then installed on the first locating pins 25 to secure the outer thermal insulation layer 24 to the outer cylinder 21. The spot welds connecting the connecting plate 501 to the first and second curved plates 211, 212 are then removed, and the two halves are removed from the outer diffuser welding fixture 50.

[0037] Weld second locating pins 35 to the inner wall of the inner cylinder 31 according to the second locating pin markings 314. Slide the inner thermal insulation layer 34 onto the second locating pins 35 through the mounting holes. Then, install second stoppers 36 on the second locating pins 35 to secure the inner thermal insulation layer 34 to the inner cylinder 31. After welding, remove the inner diffuser 30 from the inner diffuser welding tool 60.

[0038] In S7, see Figure 2 , a hole is opened along the outer end mark 213 of the airfoil to form an airfoil notch, and the front and rear halves of the outer cylinder 21 are respectively inserted into the outside of the carbon steel body 10 from the front and rear ends of the carbon steel body 10, and the front and rear halves of the outer cylinder 21 are welded and fixed.

[0039] In S9, see Figure 3 、 5, open an airfoil notch along the inner end mark 313 of the airfoil body, radially cut the inner cylinder 31 into two halves along the dividing line 315, and respectively insert the two halves into the inner side of the carbon steel body 10 from the front and rear ends of the carbon steel body 10, first weld the two halves of the inner cylinder 31 to fix them, and then weld the airfoil body 40 to the inner cylinder 31.

[0040] Example 2: An outer diffuser welding fixture 50 used in the diffuser assembly method includes a first conical ring portion 51 and a second conical portion 52. The outer walls of the first conical ring portion 51 and the second conical portion 52 have different tapers, and the first conical ring portion 51 and the second conical portion 52 are detachably connected by bolts. The first conical ring portion 51 and the second conical portion 52 each include a plurality of support rings 502 with different outer diameters, and the upper and lower support rings 502 are welded and fixed by a first rib 503. The first conical ring portion 51 and the second conical portion 52 are provided to locate the different tapers of the first curved plate 211 and the second curved plate 212. The first conical ring portion 51 and the second conical portion 52 are detachably connected by bolts to facilitate removal of the welded outer diffuser 20. At the same time, the hollow and openwork sidewalls of the outer diffuser welding fixture 50 provide space for welding.

[0041] Example 3: An inner diffuser welding jig 60 used in the aforementioned diffuser assembly method includes a first semi-ring portion 61 and a second semi-ring portion 62, each detachably connected by bolts. The first semi-ring portion 61 and the second semi-ring portion 62 each include multiple semi-rings 601, with the upper and lower semi-rings 601 welded and secured together via a second rib 602. The first semi-ring portion 61 and the second semi-ring portion 62 are detachably connected by bolts, allowing them to be opened after welding the inner diffuser 30, thereby allowing removal of the inner diffuser 30 within the inner diffuser welding jig 60. Similarly, the hollow, openwork sidewalls of the inner diffuser welding jig 60 provide space for welding.

[0042] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Any modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for assembling a diffuser tube, characterized in that: The following steps are involved: S1, manufacturing an outer diffuser tube welding tool (50) and an inner diffuser tube welding tool (60); S2, cutting the outer cylinder (21) of the connecting pipe outer diffuser (20); S3, unloading the inner cylinder (31) of the inner diffuser cylinder (30); S4, welding the outer diffuser front flange (22) and the outer diffuser rear flange (23) at both ends of the outer cylinder (21) using the outer diffuser welding tool (50); S5, welding the inner diffuser front flange (32) and the inner diffuser rear flange (33) at both ends of the inner cylinder (31) using the inner diffuser welding tool (60); S6. Installing an outer heat insulation layer (24) on the outer wall of the outer cylinder (21), and installing an inner heat insulation layer (34) on the inner wall of the inner cylinder (31); S7, opening an airfoil-shaped notch on the outer cylinder (21), and installing the connecting pipe outer diffuser (20) to the outside of the carbon steel body (10); S8, fitting the airfoil (40) onto the supporting portion of the carbon steel body (10), and welding one end of the airfoil (40) to the corresponding airfoil notch on the outer cylinder (21); S9. An airfoil notch is formed on the inner cylinder (31), and the middle portion of the inner cylinder (31) is radially cut into two halves. The diffuser tube (30) is installed inside the carbon steel body (10), and the other end of the airfoil (40) is welded to the corresponding airfoil notch on the inner cylinder (31).

2. The method for assembling a diffuser tube according to claim 1, characterized in that: In S2, the material constituting the outer cylinder (21) includes a first curved plate (211) and a second curved plate (212). When the first curved plate (211) and the second curved plate (212) are cut, an airfoil outer end mark (213) and a first positioning pin mark (214) are respectively engraved on the first curved plate (211) and the second curved plate (212).

3. The method for assembling a pipe diffuser according to claim 2, characterized in that: In S3, the inner cylinder (31) is blanked to produce an inner cylinder material (311), and an airfoil inner end mark (313), a second positioning pin mark (314), and a dividing line (315) are engraved on the inner cylinder material (311).

4. The method for assembling a pipe diffuser according to claim 3, characterized in that: In S4, the first curved plate (211) is surrounded on the outer upper side of the outer diffuser tube welding tool (50), the second curved plate (212) is surrounded on the outer lower side of the outer diffuser tube welding tool (50), a plurality of connecting plates (501) are welded inside the outer diffuser tube welding tool (50), and the connecting plates (501) are fixed to the inner walls of the first curved plate (211) and the second curved plate (212) by spot welding; the outer diffuser tube front flange (22) is mounted on the outer side of the top of the outer diffuser tube welding tool (50), the upper end of the first curved plate (211) is welded to the outer diffuser tube front flange (22), the outer diffuser tube rear flange (23) is mounted on the outer side of the bottom of the outer diffuser tube welding tool (50), and the lower end of the second curved plate (212) is welded to the outer diffuser tube rear flange (23).

5. The method for assembling a pipe diffuser according to claim 4, characterized in that: In S5, the cut material is rolled back and placed inside the inner diffuser tube welding fixture (60), the inner diffuser tube front flange (32) is installed on the inner side of the top of the inner diffuser tube welding fixture (60), and the inner diffuser tube rear flange (33) is installed on the inner side of the bottom of the inner diffuser tube welding fixture (60), and then the inner diffuser tube front flange (32) and the inner diffuser tube rear flange (33) are respectively welded to the two ends of the inner cylinder body (31).

6. The method for assembling a pipe diffuser according to claim 5, characterized in that: In S6, a first positioning pin (25) is welded to the outer wall of the first arc plate (211) and the second arc plate (212) according to the first positioning pin mark (214), the outer heat insulation layer (24) is fitted onto the first positioning pin (25) through the mounting hole, and then a first limiting member (26) is installed on the first positioning pin (25) to fix the outer heat insulation layer (24) on the outer cylinder (21); a second positioning pin (35) is welded to the inner wall of the inner cylinder (31) according to the second positioning pin mark (314), the inner heat insulation layer (34) is fitted onto the second positioning pin (35) through the mounting hole, and then a second limiting member (36) is installed on the second positioning pin (35) to fix the inner heat insulation layer (34) on the inner cylinder (31).

7. The method for assembling a diffuser tube according to claim 6, characterized in that: In S7, a hole is opened along the outer end mark (213) of the airfoil body to form an airfoil body notch, and the front and rear halves of the outer cylinder (21) are respectively inserted into the outer side of the interior of the carbon steel body (10) from the front and rear ends of the carbon steel body (10), and the front and rear halves of the outer cylinder (21) are welded and fixed.

8. The method for assembling a pipe diffuser according to claim 7, characterized in that: In S9, an airfoil notch is opened along the mark (313) at the inner end of the airfoil, and the inner cylinder (31) is radially cut into two halves along the dividing line (315). The two halves are respectively inserted into the inner side of the carbon steel body (10) from the front and rear ends of the carbon steel body (10). The two halves of the inner cylinder (31) are first welded and fixed, and then the airfoil (40) and the inner cylinder (31) are welded.

9. An outer diffuser tube welding tool (50) used in the method for assembling a diffuser tube connected to a pipe as claimed in any one of claims 1 to 8, characterized in that: The outer diffuser tube welding fixture (50) comprises a first truncated cone ring portion (51) and a second truncated cone portion (52); the outer walls of the first truncated cone ring portion (51) and the second truncated cone portion (52) have different tapers; the first truncated cone ring portion (51) and the second truncated cone portion (52) are detachably connected via bolts; the first truncated cone ring portion (51) and the second truncated cone portion (52) respectively comprise a plurality of support rings (502) with different outer diameters; the upper and lower support rings (502) are welded and fixed via a first rib plate (503).

10. An inner diffuser tube welding tool (60) used in the method for assembling a diffuser tube connected to a pipe according to any one of claims 1 to 8, characterized in that: The inner diffuser tube welding fixture (60) comprises a first semi-ring portion (61) and a second semi-ring portion (62), and the first semi-ring portion (61) and the second semi-ring portion (62) are detachably connected via bolts; the first semi-ring portion (61) and the second semi-ring portion (62) each comprise a plurality of semi-rings (601), and the upper and lower semi-rings (601) are welded and fixed via a second rib plate (602).

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