A spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine.

Abstract

A spot welding fixture for welding the outer side of the transition section rear seal of a gas turbine is disclosed, relating to the field of welding technology for the transition section rear seal of a gas turbine. This invention addresses the problem that existing welding processes easily cause severe workpiece deformation when welding irregularly shaped thin plates on the outer side of the transition section, failing to meet product drawings and assembly requirements. The fixture includes a positioning base plate, an arc-shaped pressure plate, a side positioning plate, and an irregularly shaped thin plate. The arc-shaped pressure plate is detachably fixed to the upper end face of the positioning base plate, and the side positioning plate is detachably fixed to the side end face of the positioning base plate. The positioning base plate, arc-shaped pressure plate, and side positioning plate are all arc-shaped. Several first welding holes are provided on the positioning base plate, and several second welding holes are provided on the arc-shaped pressure plate. The first and second welding holes correspond one-to-one. This invention is used for welding irregularly shaped thin plates for the transition section rear seal of a gas turbine.

Description

Technical Field

[0001] This utility model relates to the field of welding technology for the rear seal of the transition section of a gas turbine, and in particular to a spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine. Background Technology

[0002] The transition section of the gas turbine is a critical connecting component between the combustion chamber and the turbine. It is used to uniformly guide the high-temperature, high-pressure gas from the combustion chamber outlet into the first-stage turbine stator blades, ensuring that the airflow angle and pressure distribution meet the turbine design requirements. The front and rear sealing systems of the gas turbine transition section act as aerodynamic-mechanical barriers between the combustion chamber and the turbine module. The front seal is installed at the combustion chamber outlet to establish a pressure boundary, preventing high-temperature gas from leaking into undesigned paths and ensuring that 100% of the gas enters the transition section flow channel. The rear seal is installed at the junction of the transition section and the turbine stator blades to prevent gas from leaking backwards into the turbine disk cavity.

[0003] The outer side of the transition section's rear seal is a thin-walled part, which is welded from two stacked 0.75 mm irregularly shaped thin plates. This irregularly shaped thin plate has one straight section and one vertically bent section. Welding must be performed at the welding point on the vertically bent section, making the welding process difficult. Existing clamping tools are prone to causing severe workpiece deformation during the welding process, failing to meet the product drawings and assembly requirements. Utility Model Content

[0004] In order to solve the problem that existing welding processes easily cause severe workpiece deformation when welding irregularly shaped thin plates on the outer side of the transition section, which fails to meet product drawings and assembly requirements, this utility model provides a spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine, thereby solving the problems mentioned in the background art.

[0005] The technical solution of this utility model is:

[0006] A spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine includes a positioning base plate, an arc pressure plate, a side positioning plate, and an irregularly shaped thin plate.

[0007] The arc-shaped pressure plate is detachably fixed to the upper end face of the positioning base plate, and the side positioning plate is detachably fixed to the side end face of the positioning base plate. The positioning base plate, the arc-shaped pressure plate, and the side positioning plate are all arc-shaped. Several first welding holes are opened on the positioning base plate, and several second welding holes are opened on the arc-shaped pressure plate. The first welding holes and the second welding holes correspond one-to-one.

[0008] The irregularly shaped thin plate is arc-shaped in general. The irregularly shaped thin plate includes a straight part and a vertically bent part that is perpendicular to the straight part. The vertically bent part is fixed between the positioning base plate and the arc-shaped pressure plate, and the straight part is fixed between the adjacent end faces of the arc-shaped pressure plate and the side positioning plate.

[0009] Furthermore, the positioning base plate has 13 first welding holes, and the arc-shaped pressure plate has 13 second welding holes.

[0010] Furthermore, the diameters of the first and second welding holes are 18-26 mm.

[0011] Furthermore, a center plate is provided in the middle section of the vertical bending section, and welding elongated holes are opened in the middle sections of the positioning base plate and the arc pressure plate.

[0012] Furthermore, two positioning inserts are provided in the middle of the positioning base plate. The two positioning inserts pass through the arc-shaped pressure plate, and the two arc-shaped pressure plates abut against the left and right sides of the center plate respectively.

[0013] Furthermore, the arc diameter of the positioning base plate is 1300-1350mm.

[0014] Furthermore, the arc of the positioning base plate is 20-28°.

[0015] Furthermore, the arc-shaped pressure plate is detachably fixed to the upper surface of the positioning base plate by several equidistant hexagonal bolts.

[0016] Furthermore, the side positioning plate is detachably fixed to the side end face of the positioning base plate by several equidistant fixing bolts.

[0017] Furthermore, end face blocks are provided on both the left and right ends of the positioning base plate, and the end face blocks abut against the left and right ends of the arc pressure plate and the vertical bending part.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. A spot welding fixture for welding the outer side of the rear seal of a gas turbine transition section, comprising a positioning base plate, an arc-shaped pressure plate, and a side positioning plate with the same curvature as the irregularly shaped thin plate. The positioning base plate and the arc-shaped pressure plate clamp the vertically bent portion, while the arc-shaped pressure plate and the side positioning plate clamp the straight portion. Compared to traditional clamping methods, by increasing the contact area between the fixture and the irregularly shaped thin plate, deformation of the irregularly shaped thin plate caused by external force and heat is reduced, ensuring the assembly accuracy of the workpiece after welding.

[0020] 2. The first welding hole and the second welding hole correspond one-to-one with the welding points on the vertical bend. The diameter of the first welding hole and the second welding hole is larger than the diameter of the welding gun so that the welding gun can pass through to weld the upper end face and the lower end welding point of the vertical bend.

[0021] 3. It is equipped with end face blocks and positioning inserts for positioning the irregular thin plate. When clamping, the center plate is inserted between the two positioning inserts, and the irregular thin plate is adjusted so that its left and right ends abut against the end face blocks respectively to complete the lateral positioning of the irregular thin plate. Attached Figure Description

[0022] Figure 1 Schematic diagram of the utility model Figure I ;

[0023] Figure 2 This is a longitudinal sectional view of the utility model;

[0024] Figure 3 Schematic diagram of the utility model Figure II ;

[0025] Figure 4 This is a top view of the utility model;

[0026] Figure 5 This is a bottom view of the utility model;

[0027] Figure 6 This is a structural schematic diagram of the positioning base plate;

[0028] Figure 7 This is a schematic diagram of the arc-shaped pressure plate.

[0029] Figure 8 This is a schematic diagram of an irregularly shaped thin plate.

[0030] In the figure: 1. Positioning base plate; 2. Arc pressure plate; 3. Side positioning plate; 4. First welding hole; 5. Second welding hole; 6. Irregularly shaped thin plate; 601. Straight part; 602. Vertical bending part; 603. Center plate; 7. Welding elongated hole; 8. Positioning insert plate; 9. Hex bolt; 10. Fixing bolt; 11. End face stop. Detailed Implementation

[0031] Specific implementation method one: See Figure 1-5 As shown, a spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine is provided in this embodiment. It includes a positioning base plate 1, an arc pressure plate 2, a side positioning plate 3, and an irregularly shaped thin plate 6.

[0032] The arc-shaped pressure plate 2 is detachably fixed to the upper end face of the positioning base plate 1, and the side positioning plate 3 is detachably fixed to the side end face of the positioning base plate 1. The positioning base plate 1, the arc-shaped pressure plate 2 and the side positioning plate 3 are all arc-shaped. The positioning base plate 1 is provided with several first welding holes 4, and the arc-shaped pressure plate 2 is provided with several second welding holes 5. The first welding holes 4 and the second welding holes 5 correspond one-to-one.

[0033] The irregularly shaped thin plate 6 is generally arc-shaped. The irregularly shaped thin plate 6 includes a straight part 601 and a vertically bent part 602 perpendicular to the straight part 601. The vertically bent part 602 is fixed between the positioning base plate 1 and the arc-shaped pressure plate 2. The straight part 601 is fixed between the adjacent end faces of the arc-shaped pressure plate 2 and the side positioning plate 3.

[0034] Furthermore, both the positioning base plate 1 and the arc-shaped pressure plate 2 are elongated arc-shaped structures, while the side positioning plate 3 is an elongated fan-shaped structure. The irregularly shaped thin plate 6 is divided into a top irregularly curved section, a straight section 601, and a vertically bent section 602. The irregularly shaped thin plate 6 has an overall arc-shaped structure, and the curvature of the positioning base plate 1, the arc-shaped pressure plate 2, and the side positioning plate 3 is consistent with the curvature of the irregularly shaped thin plate 6. The irregularly shaped thin plate 6 is composed of two thin-walled plates stacked one on top of the other. The upper and lower end faces of the vertically bent section 602 of the irregularly shaped thin plate 6 have multiple welding points. During clamping, the vertically bent section 602 is pressed between the positioning base plate 1 and the arc-shaped pressure plate 2 by bolts, and the straight section 601 is pressed between the arc-shaped pressure plate 2 and the side positioning plate 3, thus fixing the irregularly shaped thin plate 6. The welding torch passes through the first welding hole 4 and the second welding hole 5 to weld the welding points on the upper and lower sides of the vertically bent section 602. The irregular thin plate 6 is clamped by a plate-shaped positioning base plate 1, an arc-shaped pressure plate 2, and a side positioning plate 3. Compared with the traditional clamping method, by increasing the contact area between the clamp and the irregular thin plate 6, the deformation of the irregular thin plate 6 caused by external force and heat is reduced, thus ensuring the assembly accuracy of the workpiece after welding.

[0035] Specific implementation method two: See Figure 6-7 As shown, the positioning base plate 1 of this embodiment has 13 first welding holes 4 and the arc pressure plate 2 has 13 second welding holes 5.

[0036] Specific implementation method three: See Figure 6-7 As shown, the diameter of the first welding hole 4 and the second welding hole 5 in this embodiment is 18-26mm.

[0037] Furthermore, the first welding hole 4 and the second welding hole 5 are used for the welding gun to pass through. Thirteen welding points are provided on both the upper and lower sides of the irregularly shaped thin plate 6. Therefore, thirteen welding holes, corresponding one-to-one with the welding points on the irregularly shaped thin plate 6, are opened on the positioning base plate 1 and the arc-shaped pressure plate 2. The diameters of the first welding hole 4 and the second welding hole 5 are larger than the diameter of the welding gun, allowing the welding gun to pass through the positioning base plate 1 and the arc-shaped pressure plate 2 to weld the upper and lower welding points of the vertically bent portion 602.

[0038] Detailed Implementation Method Four: See [link] Figure 6-8 As shown, in this embodiment, a center plate 603 is provided in the middle section of the vertical bending part 602, and welding elongated holes 7 are provided in the middle sections of the positioning base plate 1 and the arc pressure plate 2.

[0039] Specific implementation method five: See Figure 6 As shown, in this embodiment, the positioning base plate 1 is provided with two positioning inserts 8 in the middle. The two positioning inserts 8 pass through the arc pressure plate 2, and the two arc pressure plates 2 respectively abut against the left and right sides of the center plate 603.

[0040] Furthermore, since the center plate 603 is an inherent structure of the irregularly shaped thin plate 6, this device utilizes the structural characteristics of the center plate 603 to design positioning inserts 8 to achieve lateral positioning. The center plate 603 has several welding points, therefore the length of the welding holes needs to be increased to ensure that all welding points are exposed. Welding elongated holes 7 are provided on the positioning base plate 1 and the arc-shaped pressure plate 2, and the welding elongated holes 7 correspond to the welding points on the center plate 603 to meet welding requirements. Two positioning inserts 8 are set on the positioning base plate 1, located on the left and right sides of the center plate 603 respectively. Two long slots are provided on the arc-shaped pressure plate 2 for the positioning inserts 8 to pass through. During clamping, the center plate 603 is inserted between the two positioning inserts 8, so that the two positioning inserts 8 abut against the left and right sides of the center plate 603, achieving lateral positioning of the irregularly shaped thin plate 6.

[0041] Specific implementation method six: See Figure 6-8 As shown, the arc diameter of the positioning base plate 1 in this embodiment is 1300-1350mm.

[0042] Detailed implementation method seven: See Figure 6-8 As shown, the arc of the positioning base plate 1 in this embodiment is 20-28°.

[0043] Furthermore, the arc diameter of the clamping surface of the positioning base plate 1, the arc pressure plate 2, and the side positioning plate 3 is the same as the arc diameter and arc angle of the corresponding irregular thin plate 6 to be clamped. The arc diameter is 1300-1350mm, and the arc angle is 20-28°. As an alternative implementation, the arc diameter of the arc pressure plate 2 and the side positioning plate 3 is 300-450mm. Several arc pressure plates 2 and side positioning plates 3 are fixed on the positioning base plate 1 to complete the fixing of the entire irregular thin plate 6. The fixing and clamping of irregular thin plates 6 of different lengths can be achieved by changing the number of arc pressure plates 2 and side positioning plates 3.

[0044] Detailed Implementation Method Eight: See also Figure 1 As shown, in this embodiment, the arc-shaped pressure plate 2 is detachably fixed to the upper surface of the positioning base plate 1 by several equidistant hexagonal bolts 9.

[0045] Detailed implementation method nine: See Figure 2 As shown, in this embodiment, the side positioning plate 3 is detachably fixed to the side end face of the positioning base plate 1 by several equally spaced fixing bolts 10.

[0046] Furthermore, in order to achieve detachable fixing of the arc-shaped pressure plate 2 and the side positioning plate 3, the arc-shaped pressure plate 2 and the side positioning plate 3 are fixed by hexagonal bolts 9 and fixing bolts 10 arranged at equal intervals, respectively.

[0047] Detailed Implementation Method Ten: See [link] Figure 1As shown, the positioning base plate 1 of this embodiment is provided with end face blocks 11 on both the left and right ends, and the end face blocks 11 abut against the left and right ends of the arc pressure plate 2 and the vertical bending part 602.

[0048] Furthermore, the end face blocks 11 also serve to position the irregularly shaped thin plate 6. When installing the irregularly shaped thin plate 6, the two sides of the vertically bent portion 602 in the irregularly shaped thin plate 6 are pressed against the two end face blocks 11 to complete the lateral positioning of the irregularly shaped thin plate 6. The end face blocks 11 also assist in the installation of the arc-shaped pressure plate 2. When fixing the arc-shaped pressure plate 2, the arc-shaped pressure plate 2 is fixed between the two end face blocks 11.

[0049] In use, the side positioning plate 3 is fixed to the side end of the positioning base plate 1 with fixing bolts 10. The irregularly shaped thin plate 6 is placed on the positioning base plate 1, and one side of the irregularly shaped thin plate 6 is pressed tightly against the end face stop 11. Then, the straight part 601 of the irregularly shaped thin plate 6 is pressed tightly against the side positioning plate 3, while the center plate 603 of the irregularly shaped thin plate 6 abuts against the left and right sides of the positioning insert plate 8. Then, the arc pressure plate 2 is fixed to the positioning base plate 1 with hexagonal bolts 9, thus completing the fixing of the irregularly shaped thin plate 6. Finally, the welding torch is used to weld the welding points on the irregularly shaped thin plate 6 through the first welding hole 4, the second welding hole 5, and the welding elongated hole 7.

[0050] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A spot welding tooling for welding the aft seal outboard side of a turbine transition piece, characterized by: It includes a positioning base plate (1), an arc pressure plate (2), a side positioning plate (3), and an irregular thin plate (6); The arc-shaped pressure plate (2) is detachably fixed to the upper end face of the positioning base plate (1), and the side positioning plate (3) is detachably fixed to the side end face of the positioning base plate (1). The positioning base plate (1), the arc-shaped pressure plate (2) and the side positioning plate (3) are all arc-shaped. The positioning base plate (1) has several first welding holes (4), and the arc-shaped pressure plate (2) has several second welding holes (5). The first welding holes (4) and the second welding holes (5) correspond one to one. The irregular thin plate (6) is arc-shaped in general. The irregular thin plate (6) includes a straight part (601) and a vertically bent part (602) perpendicular to the straight part (601). The vertically bent part (602) is fixed between the positioning base plate (1) and the arc pressure plate (2). The straight part (601) is fixed between the adjacent end faces of the arc pressure plate (2) and the side positioning plate (3).

2. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The positioning base plate (1) has 13 first welding holes (4), and the arc pressure plate (2) has 13 second welding holes (5).

3. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The diameter of the first welding hole (4) and the second welding hole (5) is 18-26 mm.

4. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The middle section of the vertical bending part (602) is provided with a center plate (603), and the middle sections of the positioning base plate (1) and the arc pressure plate (2) are provided with welding elongated holes (7).

5. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 4, wherein: Two positioning plates (8) are provided in the middle of the positioning base plate (1). The two positioning plates (8) pass through the arc pressure plate (2) and the two arc pressure plates (2) abut against the left and right sides of the center plate (603) respectively.

6. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The arc diameter of the positioning base plate (1) is 1300-1350mm.

7. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 6, wherein: The arc of the positioning base plate (1) is 20-28°.

8. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The arc-shaped pressure plate (2) is detachably fixed to the upper surface of the positioning base plate (1) by several equidistant hexagonal bolts (9).

9. The spot welding fixture for welding the outer side of the rear seal of the transition section of a gas turbine according to claim 1, characterized in that: The side positioning plate (3) is detachably fixed to the side end face of the positioning base plate (1) by several equally spaced fixing bolts (10).

10. The spot welding tooling for welding the aft seal outboard of a turbine transition section of claim 1, wherein: The positioning base plate (1) is provided with end face blocks (11) on both the left and right ends, and the end face blocks (11) abut against the left and right ends of the arc pressure plate (2) and the vertical bending part (602).

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