Assembly welding tool for inner cylinder and guide vane of direct-current spray pipe of large impulse turbine

Abstract

The utility model discloses a large-scale impulse turbine direct current spray pipe inner cylinder and guide vane assembly welding tool which comprises a base, a guide vane assembly, an inner cylinder and a guide vane assembly, the outer supporting unit is arranged on the base and used for supporting and positioning the inner cylinder and the guide vane; and the inner supporting unit is arranged in the inner cylinder and used for playing a supporting role when the inner cylinder and the guide vane are welded. The utility model has the advantages of novel structure and strong practicability. The assembly welding tool for the inner barrel and the guide vane of the direct-current spray pipe is low in cost, is used for assembly welding with the large size and the high precision requirement, is firm in fixation, is convenient and reliable, and can be repeatedly used.

Description

Technical Field

[0001] This utility model relates to the field of welding tooling technology, and more specifically to a welding tooling for the inner cylinder and guide vane assembly of a large impact turbine DC nozzle. Background Technology

[0002] The DC nozzle is a core component of the impulse turbine assembly. In the past, the company did not have dedicated tooling for this type of product. When welding the inner cylinder and guide vane assembly, only temporary jacks were used for support in the height direction, and the position of the guide vanes on both sides was adjusted manually. It was difficult to control the straightness and parallelism of the guide vanes and the cylinder, resulting in a large deviation from the theoretical value. At present, the 500MW unit of the Zhala project in Tibet is the world's largest impulse turbine unit. Its DC nozzle assembly is relatively large, with an axial length of about 2100mm and a width of 1500mm. Relying solely on jack support and manual adjustment cannot guarantee the dimensional and positional tolerances after welding.

[0003] The DC nozzle is a core component of the impulse turbine unit. The welding precision of the inner cylinder and guide vane assembly directly affects the water flow state of the unit, thus directly affecting the overall power generation efficiency of the unit. Moreover, due to the high-strength material Q500D-Z35 for the guide vanes, the welding of the inner cylinder and guide vanes is prone to deformation. If the support is unstable, it will lead to the failure of the dimensional and positional tolerances after welding, and in severe cases, it will lead to the scrapping of the workpiece. Utility Model Content

[0004] The purpose of this utility model is to provide a welding fixture for the inner cylinder of the DC nozzle and the guide vane assembly of a large impact turbine, in order to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A welding fixture for the inner cylinder of a large impulse turbine direct-current nozzle and the guide vane assembly, comprising:

[0007] The base serves a supporting function;

[0008] An external support unit is disposed on the base and is used to support and position the inner cylinder and the guide vane;

[0009] An inner support unit is disposed within the inner cylinder and serves to provide support during the welding of the inner cylinder and the guide vane.

[0010] In some embodiments, the outer support unit includes: a first outer support plate, a second outer support plate, and a third outer support plate, which are sequentially disposed on the base. The middle portions of the first outer support plate, the second outer support plate, and the third outer support plate are respectively provided with positioning grooves for supporting the inner cylinder. The third support plate is provided with a limiting baffle.

[0011] In some embodiments, the guide vane is positioned by a first outer support plate and a second outer support plate, wherein the height of the first outer support plate is greater than the height of the second outer support plate, and the top of the first outer support plate is an inclined surface, while the top of the second outer support plate is a flat surface. The positioning of the guide vane is achieved by the inclined surface at the top of the first outer support plate and the flat surface at the top of the second outer support plate.

[0012] In some embodiments, the inner support unit includes a plurality of cross supports, the four end faces of which are configured as arcs adapted to the inner cylinder.

[0013] In some embodiments, a plurality of cross supports are arranged at equal intervals inside the inner cylinder.

[0014] In some embodiments, the system further includes lugs disposed at both ends of the inner cylinder.

[0015] The advantages of this utility model compared with the prior art are:

[0016] This utility model has a novel structure and strong practicality. The welding fixture for the DC nozzle inner cylinder and guide vane assembly provided in this application is low in cost, suitable for welding assembly with large dimensions and high precision requirements, and provides firm, convenient, and reliable fixing, and can be reused. Attached Figure Description

[0017] Figure 1 A schematic diagram of the welding fixture for the inner cylinder of the DC nozzle and the guide vane assembly of a large impulse turbine.

[0018] Figure 2 A side view schematic diagram of the welding fixture for the inner cylinder of the DC nozzle and the guide vane assembly of a large impulse turbine.

[0019] Figure 3 A front view schematic diagram of the welding fixture for the inner cylinder of the DC nozzle and the guide vane assembly of a large impulse turbine.

[0020] Figure 4 A top-view schematic diagram of the welding fixture for the inner cylinder of the DC nozzle and the guide vane assembly of a large impulse turbine.

[0021] Illustration: 1-Inner cylinder, 2-Guide vane, 3-Base, 4-First outer support plate, 5-Second outer support plate, 6-Third outer support plate, 7-Cross support. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0027] The following will combine Figures 1-4 This application provides a detailed description of the welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct-current nozzle, as described in the embodiments of this application. It is worth noting that the following embodiments are merely for explaining this application and do not constitute a limitation thereof.

[0028] Example 1:

[0029] See Figure 1-4As shown, a welding fixture for the inner cylinder and guide vane assembly of a large impact turbine DC nozzle includes: a base 3, an outer support unit, and an inner support unit. The base 3 provides support; the outer support unit is disposed on the base 3 and is used to support and position the inner cylinder 1 and the guide vane 2; the inner support unit is disposed inside the inner cylinder 1 and is used to provide support during the welding of the inner cylinder 1 and the guide vane 2.

[0030] Specifically, this fixture first places the inner cylinder 1 on the outer support unit to achieve axial positioning. The guide vane 2 is positioned with the inner cylinder 1 through the outer support unit, and then welding is completed.

[0031] Before the inner cylinder 1 is placed on the outer support unit, the inner support unit is spot-welded into the inner cylinder 1 to support and prevent deformation.

[0032] In some embodiments, the outer support unit includes: a first outer support plate 4, a second outer support plate 5, and a third outer support plate 6, which are sequentially arranged on the base 3. The middle portions of the first outer support plate 4, the second outer support plate 5, and the third outer support plate 6 are respectively provided with positioning grooves for supporting the inner cylinder 1. The third support plate is provided with a limiting baffle.

[0033] The inner cylinder 1 is supported and positioned by the first outer support plate 4, the second outer support plate 5 and the third outer support plate 6, and the limiting baffle provided on the third support plate can help the inner cylinder 1 achieve axial positioning.

[0034] The inner cylinder 1 is positioned by the first outer support plate 4, the second outer support plate 5 and the third outer support plate 6, and then the guide vane 2 is positioned according to the height and structure of the first outer support plate 4 and the second outer support plate 5.

[0035] In some embodiments, the guide vane 2 is positioned by the first outer support plate 4 and the second outer support plate 5. The height of the first outer support plate 4 is greater than the height of the second outer support plate 5, and the top of the first outer support plate 4 is an inclined surface, while the top of the second outer support plate 5 is a flat surface. Positioning of the guide vane 2 is achieved through the inclined surface at the top of the first outer support plate 4 and the flat surface at the top of the second outer support plate 5. Since the guide vane 2 itself has both a flat surface and an inclined surface, the position of the guide vane 2 relative to the inner cylinder 1 can be achieved by setting the first outer support plate 4 and the second outer support plate 5 as corresponding inclined and flat surfaces.

[0036] To ensure that the inner cylinder 1 is not deformed during welding of the guide vane 2 and the inner cylinder 1, an inner support unit is provided inside the inner cylinder 1. The inner support unit includes several cross supports 7, the four end faces of which are configured in an arc shape adapted to the inner cylinder 1. The cross supports 7 are evenly spaced within the inner cylinder 1. After welding the inner cylinder 1 and the guide vane 2, the spot-welded cross supports 7 can be removed. The cross supports 7 are for single use only, while the remaining parts of the tooling provided in this application can be reused several times, which not only improves efficiency but also saves costs.

[0037] In some embodiments, lifting lugs are also included, which are disposed at both ends of the inner cylinder 1. This facilitates the lifting and adjustment of the workpiece.

[0038] Example 2:

[0039] This fixture adopts a steel welded structure. Considering the reuse of subsequent projects, a certain margin is given to the load-bearing strength of the external support unit. After calculation and analysis, the external support unit of the assembly fixture adopts three fan-shaped plates, namely the first external support plate 4, the second external support plate 5, and the third external support plate 6, made of ordinary carbon steel Q235B. To prevent the axial movement of the workpiece, a limiting baffle is provided on the third support plate, which has both vertical support and axial limiting functions. The thickness of the support plate is 60mm. The base 3 is made of T50 steel plate as a whole, made of Q235B. The external support unit and the base 3 are welded with continuous fillet welds with a weld web height of 20mm.

[0040] Regarding the support of the inner cylinder 1, four cross-shaped arc-shaped supports are welded axially along the inner cavity of the inner cylinder 1 using fillet welds to prevent deformation of the inner cylinder 1 under stress during welding. The end supports of the inner cylinder 1 are... Seamless steel pipe Q235B, lifting lugs welded to the end face of the support column, 40mm thick, with openings... The lifting hole is welded to the cross support 7 on the end face for use when turning over and adjusting the position.

[0041] According to the assembly and welding fixture drawing, fabricate one set of fixtures. CNC programmable machine is used to machine the positions of the first outer support plate 4, the second outer support plate 5, and the third outer support plate 6 in contact with the workpiece, ensuring accurate relative positions. During assembly, first hoist the inner cylinder 1 onto the fixture, adjust its axial position to align with the limit baffle of the third support plate, and precisely position it on the fixture. Then, assemble the guide vanes 2 onto both sides of the inner cylinder 1 and weld them together. The next cycle is used to ensure welding quality, and the assembly tolerance after welding is controlled within 3mm. Seven sets have been used, with reliable results. The cyclical use results in high assembly and welding efficiency.

[0042] The above description is only a preferred embodiment of the present utility model and is used to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding fixture for the inner cylinder of a large impact turbine direct-current nozzle and the guide vane assembly, characterized in that, include: The base serves a supporting function; An external support unit is disposed on the base and is used to support and position the inner cylinder and the guide vane; An inner support unit is disposed within the inner cylinder and serves to provide support during the welding of the inner cylinder and the guide vane.

2. The welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct current nozzle according to claim 1, characterized in that, The outer support unit includes: a first outer support plate, a second outer support plate, and a third outer support plate, which are sequentially arranged on the base. The middle portions of the first outer support plate, the second outer support plate, and the third outer support plate are respectively provided with positioning grooves for supporting the inner cylinder. The third outer support plate is provided with a limiting baffle.

3. The welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct-current nozzle according to claim 1, characterized in that, The guide vane is positioned by a first outer support plate and a second outer support plate. The height of the first outer support plate is greater than that of the second outer support plate, and the top of the first outer support plate is an inclined surface, while the top of the second outer support plate is a flat surface. The guide vane is positioned by the inclined surface at the top of the first outer support plate and the flat surface at the top of the second outer support plate.

4. The welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct-current nozzle according to claim 1, characterized in that, The inner support unit includes several cross supports, and the four end faces of the cross supports are configured as arcs that are adapted to the inner cylinder.

5. The welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct-current nozzle according to claim 4, characterized in that, Several cross supports are arranged at equal intervals inside the inner cylinder.

6. The welding fixture for the inner cylinder and guide vane assembly of a large impulse turbine direct current nozzle according to claim 4, characterized in that, It also includes lifting lugs, which are disposed at both ends of the inner cylinder.

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