Steam turbine pipeline welding tool

Abstract

A steam turbine pipeline welding tool comprises a clamp part, an upper semicircular pipe part and a lower semicircular pipe part, the clamp part comprises a locking part, an upper clamping part and a lower clamping part, the upper semicircular pipe part is fixed to the upper clamping part, the lower semicircular pipe part is fixed to the lower clamping part, and the inner wall of the upper semicircular pipe part is a semi-cylindrical surface or is close to a semi-cylindrical surface; the inner wall of the lower semicircular pipe is a semi-cylindrical surface or close to a semi-cylindrical surface; and when the upper clamping part and the lower clamping part are locked at a certain position through the locking part, the inner wall of the upper semicircular pipe part and the inner wall of the lower semicircular pipe are positioned on the same cylindrical surface or close to the same cylindrical surface. According to the steam turbine pipeline welding fixture, the steam turbine pipeline can be ensured not to deform under the condition that enough clamping force is kept, the steam turbine pipeline can be prevented from moving or rotating relatively during welding, the steam turbine pipeline is prevented from deforming during welding, the welded steam turbine pipeline is smoother and smaller in flow resistance, and the influence on the working efficiency of a steam turbine is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of auxiliary tools for steam turbines, and particularly relates to a welding tool for steam turbine pipelines. Background Art

[0002] Steam turbine pipelines are complex. Many pipelines need to be separately manufactured and then welded together for convenient installation. However, during welding, misalignment is likely to occur. High-pressure fluids flow inside the pipelines. Even a small misalignment will generate a large amount of turbulence, resulting in an increase in flow resistance. Therefore, generally, a tooling is needed for fixation during welding. After that, several points are welded first for positioning. Since it is welding pipelines, if the acting force of an ordinary tooling is too large, it will cause deformation of the pipelines, affecting the fluid flow, especially having a greater impact on high-speed flowing fluids, generating local turbulence, increasing the flow resistance, and reducing the working efficiency of the steam turbine. Content of the Utility Model

[0003] Aiming at the above-mentioned prior art, the purpose of the utility model is to provide an optimized welding tool for steam turbine pipelines.

[0004] The technical solution of the utility model is realized as follows: A welding tool for steam turbine pipelines includes a clamping part, an upper semi-circular pipe part, and a lower semi-circular pipe part. The clamping part includes a locking part, an upper clamping part, and a lower clamping part. The upper semi-circular pipe part is fixed to the upper clamping part, and the lower semi-circular pipe part is fixed to the lower clamping part. The inner wall of the upper semi-circular pipe part is a semi-cylindrical surface or close to a semi-cylindrical surface, and the inner wall of the lower semi-circular pipe is a semi-cylindrical surface or close to a semi-cylindrical surface. When the upper clamping part and the lower clamping part are locked in a certain position by the locking part, the inner walls of the upper semi-circular pipe part and the lower semi-circular pipe part are in the same cylindrical surface or close to the same cylindrical surface.

[0005] The beneficial effect of such a design is: It can ensure that the steam turbine pipeline does not deform while maintaining sufficient clamping force, which can not only avoid the relative movement or rotation of the steam turbine pipeline during welding, but also avoid the deformation of the steam turbine pipeline during welding. In this way, the welded steam turbine pipeline is flatter, has less flow resistance, and reduces the impact on the working efficiency of the steam turbine.

[0006] Furthermore, the upper semi-circular pipe includes a left upper semi-circular pipe and a right upper semi-circular pipe, and the lower semi-circular pipe part includes a right lower semi-circular pipe part and a left lower semi-circular pipe part. There is a first gap between the left upper semi-circular pipe and the right upper semi-circular pipe, and there is a second gap between the left lower semi-circular pipe part and the right lower semi-circular pipe part. In this way, spot welding can be performed at the positions of the first gap and the second gap. Adjusting the locking part can make the whole tooling rotate relative to the steam turbine pipeline, so that spot welding can be performed at different positions.

[0007] Further, the inner wall of the upper semi-circular pipe portion includes a left upper semi-conical surface and a right upper semi-conical surface. The radius of the left upper semi-conical surface and the right upper semi-conical surface near the center is greater than that of the outer side. The inner wall of the lower semi-circular pipe portion includes a left lower semi-conical surface and a right lower semi-conical surface. The radius of the left lower semi-conical surface and the right lower semi-conical surface near the center is greater than that of the outer side. When welding on the outer side, the temperature is relatively low and deformation is not likely to occur, so the radius can be reduced to increase the clamping force. The temperature at the center position is high and it is prone to thermal expansion, so a larger margin is left.

[0008] Further, the upper clamping portion is provided with an upper clamping piece, and the lower clamping portion is provided with a lower clamping piece. The upper clamping piece and the lower clamping piece are sheet-shaped. The upper semi-circular pipe portion is fixed at the end of the upper clamping piece, and the lower semi-circular pipe portion is fixed at the end of the lower clamping piece. The sheet structure has a certain elasticity and is not likely to cause deformation of the steam turbine pipeline due to excessive clamping force, that is, the magnitude of the clamping force is more controllable, avoiding the situation of excessive or too small clamping force.

[0009] Further, the first sections of the upper clamping piece and the lower clamping piece are hinged together, which is convenient for installation and manufacturing.

[0010] Further, the upper clamping piece and the lower clamping piece are of an integral structure, so the manufacturing cost is relatively low.

[0011] Further, locking screws are provided at the middle positions of the upper clamping piece and the lower clamping piece, which is convenient for locking the upper clamping piece and the lower clamping piece.

[0012] Further, a upper semi-circular notch is provided at the lower end of the middle position of the upper semi-circular pipe portion, and a lower semi-circular notch is provided at the upper end of the middle position of the lower semi-circular pipe portion. The upper semi-circular notch and the lower semi-circular notch form the same welding notch for welding, so that there is a large welding space to avoid the tooling being melted and welded to the steam turbine pipeline.

[0013] Further, the lower end of the inner side of the upper semi-circular pipe portion abuts against the upper end of the inner side of the lower semi-circular pipe portion, which can avoid excessive clamping force squeezing the steam turbine pipeline and causing deformation of the steam turbine pipeline, especially not excessively squeezing the steam turbine pipeline even under high-temperature conditions.

[0014] Further, an inclined surface is provided at the upper end of the outer side of the lower semi-circular pipe portion, which can reduce the adhesion of welding slag splashes to the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the welding tooling for the steam turbine pipeline in Embodiment 1;

[0016] Figure 2 It is a schematic diagram of the clamping state of the welding tooling for the steam turbine pipeline in Embodiment 1;

[0017] Figure 3 It is a side schematic diagram of the clamping state of the welding tooling for the steam turbine pipeline in Embodiment 1;

[0018] Figure 4 Side schematic view of the clamping state of the steam turbine pipeline welding tooling for Embodiment 2

[0019] Figure 5 Stereo schematic view of the steam turbine pipeline welding tooling for Embodiment 3

[0020] Figure 6 Side schematic view of the clamping state of the steam turbine pipeline welding tooling for Embodiment 4 Detailed implementation manners

[0021] As needed, detailed embodiments of the present utility model are disclosed herein, but it should be understood that the disclosed embodiments are only exemplary of the present utility model, and the present utility model can be implemented in different and alternative forms. The drawings are not necessarily drawn to scale, and some features may be exaggerated or reduced to show details of specific components. Therefore, the specific structural and functional details disclosed herein should not be construed as having a limiting meaning, but only as a representative basis to teach those skilled in the art to adopt the present utility model differently. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0022] Embodiment 1:

[0023] As Figure 1 , Figure 2 and Figure 3 shown, a steam turbine pipeline welding tooling includes a clamping part 1, an upper semi-circular pipe part 2 and a lower semi-circular pipe part. The clamping part 1 includes a locking part 4, an upper clamping part 5 and a lower clamping part 6. The upper semi-circular pipe part 2 is fixed to the upper clamping part 5, and the lower semi-circular pipe part 3 is fixed to the lower clamping part 6. The inner wall of the upper semi-circular pipe part 2 is a semi-cylindrical surface or close to a semi-cylindrical surface, and the inner wall of the lower semi-circular pipe part is a semi-cylindrical surface or close to a semi-cylindrical surface. When the upper clamping part 5 and the lower clamping part 6 are locked in a certain position by the locking part 4, the inner walls of the upper semi-circular pipe part 2 and the lower semi-circular pipe part are in the same cylindrical surface or close to the same cylindrical surface. If the upper clamping part 5 and the lower clamping part 6 have a certain elasticity, the upper semi-circular pipe part 2 and the lower semi-circular pipe part 3 can be designed as semi-cylindrical pipe shapes. If the upper clamping part 5 and the lower clamping part 6 do not have elasticity, the upper semi-circular pipe part 2 and the lower semi-circular pipe part 3 can be designed as shapes close to semi-cylindrical pipe shapes and have a certain elasticity, and the friction force is increased by the elastic force. The steam turbine pipeline includes a left pipe 7 and a right pipe 8, and the outer diameters of the left pipe 7 and the right pipe 8 are the same.

[0024] As Figure 1 , Figure 2 and Figure 3As shown, the upper clamping part 5 is provided with an upper clamping piece 10, and the lower clamping part 6 is provided with a lower clamping piece 11. The upper clamping piece 10 and the lower clamping piece 11 are sheet-shaped. The upper semi-circular tube part 2 is fixed at the end of the upper clamping piece 10, and the lower semi-circular tube part 3 is fixed at the end of the lower clamping piece 11. Both the upper clamping piece 10 and the lower clamping piece 11 include a bending part 9 and a flat part 12. The bending shapes of the bending parts 9 of the upper clamping piece 10 and the lower clamping piece 11 can be the same. The bending part 9 includes a welding part 13, a connecting part 14, and a transition part 15. The welding part 13 is welded and fixed to the upper semi-circular tube part 2 or the lower semi-circular tube part 3. The connecting part 14 connects the welding part 13 and the transition part 15. The transition part 15 is connected to the flat part 12. The welding part 13 is inclined to facilitate welding. The connecting part 14 extends horizontally and has a certain elasticity. The transition part 15 can accommodate the two different-angled sheet-like structures of the flat part 12 and the connecting part 14 to achieve a smooth transition.

[0025] As Figure 1 , Figure 2 and Figure 3 shown, the first sections of the upper clamping piece 10 and the lower clamping piece 11 are hinged together. Three locking screws 16 are provided at the middle positions of the upper clamping piece 10 and the lower clamping piece 11. An upper semi-circular notch 17 is provided at the lower end of the middle position of the upper semi-circular tube part 2, and a lower semi-circular notch 18 is provided at the upper end of the middle position of the lower semi-circular tube part 3. The upper semi-circular notch 17 and the lower semi-circular notch 18 form the same welding notch for welding, avoiding the high temperature during welding from melting the upper semi-circular tube part 2 and the lower semi-circular tube part 3. The lower end 19 inside the upper semi-circular tube part 2 and the upper end 20 inside the lower semi-circular tube part 3 are in contact. An inclined surface 21 is provided at the upper end outside the lower semi-circular tube part 3.

[0026] Embodiment 2:

[0027] As Figure 4 shown, the upper clamping piece 10 and the lower clamping piece 11 are of an integral structure, and the upper clamping piece 10 and the lower clamping piece 11 are directly formed by bending the same thin plate.

[0028] Embodiment 3:

[0029] As Figure 5 shown, the upper semi-circular tube part 2 includes a left upper semi-circular tube part 22 and a right upper semi-circular tube part 23, and the lower semi-circular tube part 3 includes a right lower semi-circular tube part 24 and a left lower semi-circular tube part 25. There is a first gap 26 between the left upper semi-circular tube part 22 and the right upper semi-circular tube part 23, and there is a second gap 27 between the left lower semi-circular tube part 25 and the right lower semi-circular tube part 24. The inner wall of the upper semi-circular tube part 2 includes a left upper semi-cone surface 28 and a right upper semi-cone surface 29, and the taper of the cone surface is 2 - 5 degrees. The radius of the left upper semi-cone surface 28 and the right upper semi-cone surface 29 near the center is greater than the radius of the outer side. The inner wall of the lower semi-circular tube part 3 includes a left lower semi-cone surface 30 and a right lower semi-cone surface 31, and the radius of the left lower semi-cone surface 30 and the right lower semi-cone surface 31 near the center is greater than the radius of the outer side.

[0030] Embodiment 4:

[0031] As Figure 6 shown, a welding tooling for a steam turbine pipeline includes a clamping part 1, an upper semi-circular pipe part 2 and a lower semi-circular pipe part 3. The clamping part 1 includes a locking part 4, an upper clamping part 5 and a lower clamping part 6. The upper semi-circular pipe part 2 is fixed on the upper clamping part 5, and the lower semi-circular pipe part 3 is fixed on the lower clamping part 6. The inner wall of the upper semi-circular pipe part 2 is a semi-cylindrical surface or close to a semi-cylindrical surface, and the inner wall of the lower semi-circular pipe part 3 is a semi-cylindrical surface or close to a semi-cylindrical surface. When the upper clamping part 5 and the lower clamping part 6 are locked in a certain position by the locking part 4, the inner walls of the upper semi-circular pipe part 2 and the lower semi-circular pipe part 3 are in the same cylindrical surface or close to the same cylindrical surface. The locking part 4 is locked by a screw 32.

Claims

1. A steam turbine pipeline welding tooling, characterized in that: It includes a pliers part (1), an upper semi-circular tube part (2) and a lower semi-circular tube part (3). The pliers part (1) includes a locking part (4), an upper clamping part (5) and a lower clamping part (6). The upper semi-circular tube part (2) is fixed to the upper clamping part (5), and the lower semi-circular tube part (3) is fixed to the lower clamping part (6). The inner wall of the upper semi-circular tube part (2) is a semi-cylindrical surface or close to a semi-cylindrical surface, and the inner wall of the lower semi-circular tube part (3) is a semi-cylindrical surface or close to a semi-cylindrical surface. When the upper clamping part (5) and the lower clamping part (6) are locked in a certain position by the locking part (4), the inner walls of the upper semi-circular tube part (2) and the lower semi-circular tube part (3) are in the same cylindrical surface or close to the same cylindrical surface.

2. The steam turbine pipeline welding tooling according to claim 1, characterized in that: The upper semi-circular tube part (2) includes a left upper semi-circular tube part (22) and a right upper semi-circular tube part (23). The lower semi-circular tube part (3) includes a right lower semi-circular tube part (24) and a left lower semi-circular tube part (25). There is a first gap (26) between the left upper semi-circular tube part (22) and the right upper semi-circular tube part (23), and there is a second gap (27) between the left lower semi-circular tube part (25) and the right lower semi-circular tube part (24).

3. The steam turbine pipeline welding tooling according to claim 1 or 2, characterized in that: The inner wall of the upper semi-circular tube part (2) includes a left upper semi-conical surface (28) and a right upper semi-conical surface (29). The radius of the left upper semi-conical surface (28) and the right upper semi-conical surface (29) near the center is greater than the radius of the outer side. The inner wall of the lower semi-circular tube part (3) includes a left lower semi-conical surface (30) and a right lower semi-conical surface (31). The radius of the left lower semi-conical surface (30) and the right lower semi-conical surface (31) near the center is greater than the radius of the outer side.

4. The steam turbine pipeline welding tooling according to claim 3, wherein: The upper clamping part (5) is provided with an upper clamping piece (10), and the lower clamping part (6) is provided with a lower clamping piece (11). The upper clamping piece (10) and the lower clamping piece (11) are in sheet form. The upper semi-circular tube part (2) is fixed to the end of the upper clamping piece (10), and the lower semi-circular tube part (3) is fixed to the end of the lower clamping piece (11).

5. The steam turbine pipeline welding tooling according to claim 4, characterized in that: The first sections of the upper clamping piece (10) and the lower clamping piece (11) are hinged together.

6. The steam turbine pipeline welding tooling according to claim 4, wherein: The upper clamping piece (10) and the lower clamping piece (11) are of an integral structure.

7. The steam turbine pipeline welding tooling according to claim 5 or 6, characterized in that: A locking screw (16) is provided at the middle position of the upper clamping piece (10) and the lower clamping piece (11).

8. The steam turbine pipeline welding tooling according to claim 1, characterized in that: An upper semi-circular notch (17) is provided at the lower end of the middle position of the upper semi-circular tube part (2), and a lower semi-circular notch (18) is provided at the upper end of the middle position of the lower semi-circular tube part (3). The upper semi-circular notch (17) and the lower semi-circular notch (18) form the same welding notch for welding.

9. The steam turbine pipeline welding tooling according to claim 8, wherein: The lower end (19) inside the upper semi-circular tube part (2) abuts against the upper end (20) inside the lower semi-circular tube part (3).

10. The steam turbine pipeline welding tooling according to claim 9, characterized in that: An inclined surface (21) is provided at the upper end outside the lower semi-circular tube part (3).

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