A method and tooling for assembling a nozzle diffuser tube

Abstract

This invention discloses a method and tooling for assembling a nozzle diffuser, comprising the following steps: fabricating welding fixtures for the outer and inner diffusers; cutting the outer body of the outer diffuser and the inner body of the inner diffuser; welding the outer and inner diffusers; installing the outer and inner insulation layers; installing the outer and inner insulation layers; installing the outer diffuser onto the outer side of the carbon steel body; fitting the airfoil onto the support of the carbon steel body; radially cutting the inner body in half; and installing the inner diffuser onto the inner side of the carbon steel body. Through this method and tooling, the assembly dimensions of the outer and inner diffusers are ensured, welding deformation is controlled, and the outer and inner diffusers can be easily and smoothly encased on the carbon steel body, meeting the design requirements.

Description

Technical Field

[0001] This invention relates to the field of gas turbine manufacturing technology, and in particular to a method and tooling for assembling a nozzle diffuser. Background Technology

[0002] See Figure 1 The gas turbine exhaust pipe includes a carbon steel body 10 and components such as an outer diffuser 20, an inner diffuser 30, and an airfoil 40 installed inside the carbon steel body 10. The carbon steel body 10 is divided into two halves by a split structure. The outer diffuser 20 covers the inner side of the outer cylinder of the carbon steel body 10, and the inner diffuser 30 covers the outer side of the inner cylinder of the carbon steel body 10. The airfoil 40 is supported and connects the outer diffuser 20 and the inner diffuser 30. To ensure that the outer diffuser 20 and the inner diffuser 30 can be smoothly fitted onto the carbon steel body 10 and meet the design requirements, we have proposed a method and tooling for assembling the diffuser. Summary of the Invention

[0003] To address the existing technical problems, the main objective of this invention is to provide a method and tooling for assembling a nozzle diffuser, which can easily and smoothly cover the outer and inner diffuser tubes onto the carbon steel body and meet the design requirements of the drawings.

[0004] To overcome the problems existing in the prior art, the technical solution adopted in this invention is: a method for assembling a nozzle diffuser, comprising the following steps:

[0005] S1. Fabricate welding fixtures for the outer diffuser and the inner diffuser.

[0006] S2, Unloading the outer cylinder of the external diffuser tube;

[0007] S3. Feeding the inner cylinder of the diffuser tube into the pipe;

[0008] S4. Weld the front flange and rear flange of the outer diffuser at both ends of the outer diffuser body using the outer diffuser welding fixture.

[0009] S5. Weld the front flange and rear flange of the inner diffuser at both ends of the inner diffuser body using the inner diffuser welding fixture.

[0010] S6. Install an external heat insulation layer on the outer wall of the outer cylinder and an internal heat insulation layer on the inner wall of the inner cylinder;

[0011] S7. Open an airfoil notch on the outer cylinder and install the outer diffuser tube of the nozzle onto the outside of the carbon steel body.

[0012] S8. Fit the airfoil onto the support part of the carbon steel body, and weld one end of the airfoil to the corresponding airfoil notch on the outer cylinder.

[0013] S9. Make an airfoil notch on the inner cylinder and cut the middle of the inner cylinder radially into two halves. Install the diffuser tube inside the pipe into the inner side of the carbon steel body. Weld the other end of the airfoil to the corresponding airfoil notch on the inner cylinder.

[0014] In S2, the materials that make up the outer cylinder include a first arc plate and a second arc plate. When the first arc plate and the second arc plate are being cut, the outer end mark of the airfoil and the first positioning pin mark are respectively engraved on the first arc plate and the second arc plate.

[0015] In S3, the inner cylinder material is cut and the inner cylinder body material is engraved with the inner end mark of the airfoil body, the second locating pin mark and the dividing line.

[0016] In S4, the first arc-shaped plate is surrounded on the upper outer side of the outer diffuser welding fixture, and the second arc-shaped plate is surrounded on the lower outer side of the outer diffuser welding fixture. Multiple connecting plates are welded inside the outer diffuser welding fixture, and the connecting plates are spot-welded to the inner walls of the first and second arc-shaped plates. The front flange of the outer diffuser is fitted on the top outer side of the outer diffuser welding fixture, the upper end of the first arc-shaped plate is welded to the front flange of the outer diffuser, the rear flange of the outer diffuser is fitted on the bottom outer side of the outer diffuser welding fixture, and the lower end of the second arc-shaped plate is welded to the rear flange of the outer diffuser.

[0017] In S5, the cut material is rolled back and placed inside the inner diffuser welding fixture. The front flange of the inner diffuser is installed on the top inner side of the inner diffuser welding fixture, and the rear flange of the inner diffuser is installed on the bottom inner side of the inner diffuser welding fixture. Then, the front flange and the rear flange of the inner diffuser are welded to both ends of the inner cylinder.

[0018] In S6, a first positioning pin is welded to the outer wall of the first and second arc-shaped plates according to the first positioning pin mark. The outer heat insulation layer is then fitted onto the first positioning pin through the mounting hole. After that, a first limiting member is installed on the first positioning pin to fix the outer heat insulation layer to the outer cylinder. A second positioning pin is welded to the inner wall of the inner cylinder according to the second positioning pin mark. The inner heat insulation layer is then fitted onto the second positioning pin through the mounting hole. After that, a second limiting member is installed on the second positioning pin to fix the inner heat insulation layer to the inner cylinder.

[0019] In S7, holes are made along the outer end mark of the airfoil to form an airfoil notch. The front and rear halves of the outer cylinder are inserted into the outer side of the carbon steel body from the front and rear ends of the carbon steel body, respectively, and the front and rear halves of the outer cylinder are welded and fixed.

[0020] In S9, mark the airfoil body notch along the inner end of the airfoil body, and cut the inner cylinder body radially into two halves along the dividing line. Insert the two halves into the inner side of the carbon steel body from the front and rear ends of the carbon steel body respectively. First, weld the two halves of the inner cylinder body to fix them, and then weld the airfoil body to the inner cylinder body.

[0021] A welding fixture for an outer diffuser tube in the assembly method of the aforementioned nozzle diffuser tube includes a first frustum ring portion and a second frustum-shaped portion. The outer walls of the first frustum ring portion and the second frustum-shaped portion have different tapers, and the first frustum ring portion and the second frustum-shaped portion are detachably connected by bolts. The first frustum ring portion and the second frustum-shaped portion each include multiple support rings with different outer diameters, and the upper and lower support rings are fixed together by welding a first stiffener.

[0022] An inner diffuser welding fixture for use in the aforementioned nozzle diffuser assembly method, the inner diffuser welding fixture 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; each of the first semi-ring portion and the second semi-ring portion comprises multiple semi-rings, the upper and lower semi-rings being fixed together by welding with a second stiffening plate.

[0023] The present invention has the following beneficial effects:

[0024] The method and apparatus of this invention ensure the assembly dimensions of the outer diffuser and the inner diffuser of the nozzle and control welding deformation. It not only facilitates the smooth encapsulation of the outer diffuser and the inner diffuser onto the carbon steel body, but also meets the design requirements of the drawings. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the gas turbine exhaust pipe.

[0027] Figure 2 A three-dimensional structural diagram of the outer diffuser tube for connecting pipes.

[0028] Figure 3 This is a three-dimensional structural diagram of the diffuser tube inside the pipe.

[0029] Figure 4 A planar schematic diagram of the first and second arc-shaped plates during the material cutting of the outer cylinder.

[0030] Figure 5A plan view of the inner cylinder material during the blanking process.

[0031] Figure 6 This is a schematic diagram illustrating the positioning, alignment, and welding of the outer cylinder body outside the welding fixture for the outer diffuser cylinder.

[0032] Figure 7 This is a cross-sectional structural schematic diagram of the welding fixture for the outer diffuser cylinder of the present invention.

[0033] Figure 8 This is a schematic diagram illustrating the positioning, alignment, and welding of the inner cylinder within the welding fixture for the inner diffuser cylinder.

[0034] Figure 9 This is a cross-sectional structural schematic diagram of the welding fixture for the inner diffuser cylinder of the present invention.

[0035] Figure 10 This is a top view schematic diagram of the welding fixture for the inner diffuser cylinder of the present invention.

[0036] Figure label:

[0037] Carbon steel body 10;

[0038] Connector outer diffuser 20, outer cylinder 21, first arc plate 211, second arc plate 212, airfoil outer end mark 213, first positioning pin mark 214, outer diffuser front flange 22, outer diffuser rear flange 23, outer insulation layer 24, first positioning pin 25, first limiting member 26.

[0039] The inner diffuser tube 30, inner cylinder 31, inner cylinder material 311, inner end mark of airfoil 313, second positioning pin mark 314, dividing line 315, inner diffuser front flange 32, inner diffuser rear flange 33, inner insulation layer 34, second positioning pin 35, and second limiting member 36 are included.

[0040] airfoil body 40;

[0041] The outer diffuser welding fixture 50, the first frustum ring 51, the second frustum 52, the connecting plate 501, the support ring 502, and the first stiffening plate 503;

[0042] The inner diffuser welding fixture 60, the first semi-ring 61, the second semi-ring 62, the semi-ring 601, and the second stiffening plate 602. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Example 1:

[0046] See Figures 1 to 10 This embodiment provides a method for assembling a nozzle diffuser, including the following steps:

[0047] S1. Fabricate the outer diffuser welding fixture 50 and the inner diffuser welding fixture 60.

[0048] S2, the outer cylinder 21 of the outer diffuser cylinder 20 is fed into the connector;

[0049] S3, the inner cylinder 31 of the inner diffuser cylinder 30 is fed into the pipe;

[0050] S4. Weld the front flange 22 and rear flange 23 of the outer diffuser at both ends of the outer diffuser body 21 using the outer diffuser welding fixture 50.

[0051] S5. Weld the inner diffuser front flange 32 and inner diffuser rear flange 33 at both ends of the inner diffuser body 31 using the inner diffuser welding fixture 60.

[0052] 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.

[0053] S7. Open an airfoil notch on the outer cylinder 21 and install the outer diffuser cylinder 20 of the nozzle onto the outer side inside the carbon steel body 10.

[0054] S8. Fit the airfoil 40 onto the support part of the carbon steel body 10, and weld one end of the airfoil 40 to the corresponding airfoil notch on the outer cylinder 21.

[0055] S9. Make an airfoil notch on the inner cylinder 31 and cut the middle of the inner cylinder 31 radially into two halves. Install the inner diffuser 30 of the pipe into 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.

[0056] Through the above steps, the assembly dimensions of the outer diffuser 20 and the inner diffuser 30 of the nozzle are ensured and the welding deformation is controlled. The outer diffuser 20 and the inner diffuser 30 of the nozzle can be easily wrapped onto the carbon steel body 10, and the design requirements of the drawings are met.

[0057] Specifically, in S2, see Figure 4The outer cylinder 21 is composed of a first arc-shaped plate 211 and a second arc-shaped plate 212. During the cutting process, an airfoil outer end mark 213 and a first locating pin mark 214 are respectively engraved on the first arc-shaped plate 211 and the second arc-shaped plate 212. The airfoil outer end mark 213 is used to cut the airfoil notch, and the first locating pin mark 214 is used for positioning the first locating pin 25 during welding. This improves the accuracy of the welding position of the first locating pin 25, facilitating the subsequent installation of the outer heat insulation layer 24.

[0058] In S3, see Figure 5 The inner cylinder 31 is cut into inner cylinder material 311. The inner cylinder material 311 is engraved with the airfoil inner end mark 313, the second positioning pin mark 314 and the dividing line 315. The airfoil inner end mark 313 is used to excavate the airfoil notch, the second positioning pin mark 314 is used for welding the second positioning pin 35, and the dividing line 315 is used for positioning when cutting the inner diffuser cylinder 30 of the connecting pipe.

[0059] In S4, see Figure 6 The first arc-shaped plate 211 is surrounded on the upper outer side of the outer diffuser welding fixture 50, and the second arc-shaped plate 212 is surrounded on the lower outer side of the outer diffuser welding fixture 50. Multiple connecting plates 501 are welded inside the outer diffuser welding fixture 50, and the connecting plates 501 are spot-welded to the inner walls of the first arc-shaped plate 211 and the second arc-shaped plate 212. The outer diffuser front flange 22 is fitted on the top outer side of the outer diffuser welding fixture 50. The upper end of the first arc-shaped plate 211 is welded to the outer diffuser front flange 22. The outer diffuser rear flange 23 is fitted on the bottom outer side of the outer diffuser welding fixture 50. The lower end of the second arc-shaped plate 212 is welded to the outer diffuser rear flange 23. The first arc-shaped plate 211 and the second arc-shaped plate 212 are not welded together.

[0060] In S5, see Figure 8 The cut material is rolled back and placed inside the inner diffuser welding fixture 60. The inner diffuser front flange 32 is installed on the top inner side of the inner diffuser welding fixture 60, and the inner diffuser rear flange 33 is installed on the bottom inner side of the inner diffuser welding fixture 60. Then, the inner diffuser front flange 32 and inner diffuser rear flange 33 are welded to both ends of the inner cylinder 31 respectively.

[0061] In S6, see Figure 2First positioning pins 25 are welded to the outer walls of the first arc-shaped plate 211 and the second arc-shaped plate 212 according to the first positioning pin mark 214. The outer heat insulation layer 24 is then fitted onto the first positioning pins 25 through the mounting holes. A first limiting member 26 is then installed on the first positioning pins 25 to fix the outer heat insulation layer 24 to the outer cylinder 21. Afterwards, the spot weld between the connecting plate 501 and the first arc-shaped plate 211 and the second arc-shaped plate 212 is removed, and the two halves are taken out from the outer diffuser welding fixture 50.

[0062] Weld a second positioning pin 35 to the inner wall of the inner cylinder 31 according to the second positioning pin mark 314. Then, fit the inner heat insulation layer 34 onto the second positioning pin 35 through the mounting hole. After that, install a second limiting member 36 on the second positioning pin 35 to fix the inner heat insulation layer 34 to the inner cylinder 31. After welding, remove the inner diffuser cylinder 30 from the inner diffuser cylinder welding fixture 60.

[0063] In S7, see Figure 2 Make an opening along the outer end mark 213 of the airfoil to form an airfoil notch, and insert the front and rear halves of the outer cylinder 21 into the outer side of the carbon steel body 10 from the front and rear ends of the carbon steel body 10 respectively, and weld the front and rear halves of the outer cylinder 21 to fix them.

[0064] In S9, see Figure 3 , 5 Make a notch in the airfoil body along the inner end mark 313, and cut the inner cylinder body 31 radially into two halves along the dividing line 315. Insert the two halves into the inner side of the carbon steel body 10 from the front and rear ends respectively. First, weld the two halves of the inner cylinder body 31 to fix them, and then weld the airfoil body 40 to the inner cylinder body 31.

[0065] Example 2:

[0066] A welding fixture 50 for the outer diffuser tube in the aforementioned nozzle diffuser tube assembly method is provided. The welding fixture 50 includes a first frustum-shaped ring portion 51 and a second frustum-shaped portion 52. The outer walls of the first frustum-shaped ring portion 51 and the second frustum-shaped portion 52 have different tapers, and the first frustum-shaped ring portion 51 and the second frustum-shaped portion 52 are detachably connected by bolts. The first frustum-shaped ring portion 51 and the second frustum-shaped portion 52 each include multiple support rings 502 with different outer diameters, and the upper and lower support rings 502 are welded and fixed together by a first stiffening plate 503. The first frustum-shaped ring portion 51 and the second frustum-shaped portion 52 are provided to position the different tapers of the first arc-shaped plate 211 and the second arc-shaped plate 212. The detachable connection between the first frustum-shaped ring portion 51 and the second frustum-shaped portion 52 by bolts allows for the removal of the welded outer diffuser tube 20. Simultaneously, the hollow and perforated sidewalls of the welding fixture 50 provide space for welding.

[0067] Example 3:

[0068] A welding fixture 60 for the inner diffuser tube in the aforementioned nozzle diffuser tube assembly method is provided. The inner diffuser tube welding fixture 60 includes a first semi-ring portion 61 and a second semi-ring portion 62, which are detachably connected by bolts. Each of the first and second semi-ring portions 61 and 62 includes multiple semi-rings 601, which are welded together by second stiffening plates 602. The detachable connection between the first and second semi-ring portions 61 and 62 allows the fixture to be opened after welding of the inner diffuser tube 30, thereby allowing the inner diffuser tube 30 located within the inner diffuser tube welding fixture 60 to be removed. Similarly, the hollow and perforated sidewalls of the inner diffuser tube welding fixture 60 provide space for welding.

[0069] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the invention. Modifications and variations made by those skilled in the art in accordance with the spirit of the invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method of assembling a dip tube diffuser cartridge, the method comprising: Includes the following steps: S1. Fabricate the outer diffuser welding fixture (50) and the inner diffuser welding fixture (60). S2, the outer cylinder (21) of the outer diffuser cylinder (20) is fed into the feed tube; S3, the inner cylinder (31) of the inner diffuser (30) is fed into the pipe; S4. Weld the front flange (22) and rear flange (23) of the outer diffuser at both ends of the outer cylinder (21) using the outer diffuser welding fixture (50). S5. Weld the inner diffuser front flange (32) and inner diffuser rear flange (33) at both ends of the inner diffuser body (31) using the inner diffuser welding fixture (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. Make an airfoil notch on the outer cylinder (21) and install the outer diffuser cylinder (20) of the nozzle onto the outside of the carbon steel body (10); S8. Fit the airfoil (40) onto the support of the carbon steel body (10), and weld one end of the airfoil (40) to the corresponding airfoil notch on the outer cylinder (21) for fixation; S9. Make an airfoil notch on the inner cylinder (31) and cut the middle of the inner cylinder (31) radially into two halves. Install the inner diffuser cylinder (30) of the pipe into 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). In S2, the materials that make up the outer cylinder (21) include a first arc plate (211) and a second arc plate (212). When the first arc plate (211) and the second arc plate (212) are cut, the outer end mark (213) of the airfoil and the first positioning pin mark (214) are respectively engraved on the first arc plate (211) and the second arc plate (212). In S3, the inner cylinder material (311) used to form the inner cylinder (31) is cut, and the inner end mark (313), the second positioning pin mark (314) and the dividing line (315) are engraved on the inner cylinder material (311). In S4, the first arc plate (211) is surrounded on the upper outer side of the outer diffuser welding fixture (50), and the second arc plate (212) is surrounded on the lower outer side of the outer diffuser welding fixture (50). Multiple connecting plates (501) are welded inside the outer diffuser welding fixture (50). The connecting plates (501) are spot welded to the inner walls of the first arc plate (211) and the second arc plate (212). The front flange (22) of the outer diffuser is fitted on the top outer side of the outer diffuser welding fixture (50). The upper end of the first arc plate (211) is welded to the front flange (22) of the outer diffuser. The rear flange (23) of the outer diffuser is fitted on the bottom outer side of the outer diffuser welding fixture (50). The lower end of the second arc plate (212) is welded to the rear flange (23) of the outer diffuser.

2. A method of assembling a spool piece according to claim 1, wherein In S5, the cut inner cylinder material (311) is rolled back and placed inside the inner diffuser welding fixture (60). The inner diffuser front flange (32) is installed on the top inner side of the inner diffuser welding fixture (60), and the inner diffuser rear flange (33) is installed on the bottom inner side of the inner diffuser welding fixture (60). Then, the inner diffuser front flange (32) and inner diffuser rear flange (33) are welded to both ends of the inner cylinder (31).

3. A method of assembling a spool piece according to claim 2, wherein 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), and the outer heat insulation layer (24) is fitted onto the first positioning pin (25) through the mounting hole. Then, a first limiting member (26) is installed on the first positioning pin (25) to fix the outer heat insulation layer (24) onto 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), and the inner heat insulation layer (34) is fitted onto the second positioning pin (35) through the mounting hole. Then, a second limiting member (36) is installed on the second positioning pin (35) to fix the inner heat insulation layer (34) onto the inner cylinder (31).

4. A method of assembling a spool piece according to claim 3, wherein In S7, an opening is made along the outer end mark (213) of the airfoil to form an airfoil notch. The front and rear halves of the outer cylinder (21) are respectively inserted from the front and rear ends of the carbon steel body (10) into the outer side of the carbon steel body (10). The front and rear halves of the outer cylinder (21) are welded and fixed.

5. A method of assembling a spool piece according to claim 3, wherein In S9, the airfoil is notched along the inner end mark (313) of the airfoil, and the inner cylinder (31) is radially cut into two halves along the dividing line (315). The two halves are inserted into the inner side of the carbon steel body (10) from the front and rear ends respectively. The two halves of the inner cylinder (31) are first welded and fixed, and then the airfoil (40) is welded to the inner cylinder (31).

6. An outer diffuser welding tool (50) for use in the method of assembling a spool piece diffuser of any one of claims 1 to 5, characterized by, The welding fixture (50) for the outer diffuser includes a first frustum ring (51) and a second frustum shape (52). The outer walls of the first frustum ring (51) and the second frustum shape (52) have different tapers. The first frustum ring (51) and the second frustum shape (52) are detachably connected by bolts. The first frustum ring (51) and the second frustum shape (52) each include multiple support rings (502) with different outer diameters. The upper and lower support rings (502) are welded and fixed together by a first stiffener (503).

7. An inner diffuser welding tool (60) for use in the method of assembling a nozzle diffuser according to any one of claims 1 to 5, characterized in that, The inner diffuser welding fixture (60) includes a first semi-ring (61) and a second semi-ring (62), which are detachably connected by bolts; the first semi-ring (61) and the second semi-ring (62) each include multiple semi-rings (601), and the upper and lower semi-rings (601) are fixed by welding with a second stiffener (602).

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