Copper bar welding structure of primary helium fan

Abstract

The utility model discloses a main helium fan copper bar welding structure, and relates to the technical field of main helium fans. The main helium fan copper bar welding structure comprises an end ring and a rotor copper bar, an assembly groove is formed in the end face of the end ring, and a welding flux groove and a positioning table located on one side of the welding flux groove are arranged on the bottom face of the assembly groove; one end of the rotor copper bar is arranged in the assembling groove and is positioned on the positioning table, an annular welding flux space communicated with the welding flux groove is formed between the rotor copper bar and the side face of the assembling groove, and the welding flux space and the welding flux groove are filled with welding flux used for welding the end ring and the rotor copper bar together. According to the main helium fan copper bar welding structure provided by the embodiment of the invention, during welding, the welding flux can fully fill the welding flux space and the welding flux groove after the welding flux is melted, so that the side surface and the end surface of the rotor copper bar are firmly combined with the end ring through the welding flux, and the connection strength between the rotor copper bar and the end ring is enhanced; and the problem that the root of the connection between the rotor copper bar and the end ring is broken due to insufficient connection strength of a traditional welding structure is avoided.

Description

Technical Field

[0001] This application relates to the field of main helium blower technology, specifically to a copper strip welding structure for a main helium blower. Background Technology

[0002] The main helium blower is a key active device in a high-temperature gas-cooled reactor (HTGR) of a nuclear power system. It is primarily used to provide a sufficient flow of helium to the primary coolant circuit during reactor startup, power operation, and shutdown to remove heat generated in the reactor core and ensure safe reactor operation. The main helium blower typically adopts a vertical, variable-frequency, high-speed design. Its impeller is cantilevered and coaxially arranged with the drive motor shaft.

[0003] In the structure of the main helium blower, the connection between the rotor copper bars and the end ring of the drive motor is achieved through welding. During operation, the rotor of the drive motor experiences a significant inertial torque, especially during startup and shutdown. This torque is concentrated at the root of the connection between the rotor copper bars and the end ring. However, the connection strength of traditional welded structures is relatively weak and cannot withstand such a large torque, making the root of the connection between the rotor copper bars and the end ring prone to breakage. This breakage not only damages the drive motor, severely affecting the normal operation of the main helium blower, but also necessitates frequent inspections and repairs during production, increasing maintenance costs. Utility Model Content

[0004] The purpose of this application is to provide a copper bar welding structure for a main helium blower, which solves the problem of relatively weak connection strength of the welding structure between the rotor copper bar and the end ring.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] A copper strip welding structure for a main helium blower includes an end ring and a rotor copper strip. The end face of the end ring is provided with an assembly groove, the bottom surface of the assembly groove is provided with a solder groove and a positioning platform located on one side of the solder groove. One end of the rotor copper strip is disposed in the assembly groove and positioned on the positioning platform. An annular solder space communicating with the solder groove is formed between the rotor copper strip and the side of the assembly groove. The solder space and the solder groove are filled with solder for welding the end ring and the rotor copper strip together.

[0007] Furthermore, the end face of the end ring is provided with a feeding groove, and the assembly groove is provided on the bottom surface of the feeding groove.

[0008] Furthermore, the discharge trough is an annular groove extending circumferentially along the end ring.

[0009] Furthermore, the feeding trough is provided with solder for welding the end ring to the rotor copper strip.

[0010] Furthermore, the assembly groove is an oblong groove or a rectangular groove.

[0011] Furthermore, the bottom surface of the assembly groove is provided with a plurality of solder grooves, and the portion of the bottom surface of the assembly groove located between the plurality of solder grooves forms the positioning platform.

[0012] Furthermore, the solder groove is located at the bottom edge of the assembly groove.

[0013] Furthermore, the bottom surface of the assembly slot is provided with two solder grooves, and the positioning platform is formed between the two solder grooves.

[0014] The beneficial effects of this application are:

[0015] The main helium blower copper bar welding structure provided in this application embodiment has an assembly groove on the end face of the end ring, and a solder groove and a positioning platform on the bottom surface of the assembly groove. When one end of the rotor copper bar is inserted into the assembly groove and positioned on the positioning platform, a solder space communicating with the solder groove can be formed between the rotor copper bar and the side of the assembly groove. During welding, the melted solder can fully fill the solder space and the solder groove, so that the side and end face of the rotor copper bar are firmly bonded to the end ring through the solder. This significantly enhances the connection strength between the rotor copper bar and the end ring, avoiding the problem of root breakage of the connection between the rotor copper bar and the end ring due to insufficient connection strength in traditional welding structures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the first schematic diagram of the existing main helium blower copper strip welding structure;

[0018] Figure 2 This is a second schematic diagram of the existing main helium blower copper strip welding structure;

[0019] Figure 3 This is a schematic diagram of the main helium blower copper strip welding structure provided in the embodiments of this application;

[0020] Figure 4 yes Figure 3 Enlarged view of section A in the middle;

[0021] Figure 5 yes Figure 4 A schematic diagram of the structure after solder removal;

[0022] Figure 6 This is a top view of the end ring.

[0023] Figure label:

[0024] 1-Rotor laminations;

[0025] 2-Ventilation slot plate;

[0026] 3-Rotor pressure ring;

[0027] 4-Rotor copper bars;

[0028] 5-End ring; 51-Discharge groove; 52-Assembly groove; 53-Solder groove; 54-Positioning table; 55-Solder space;

[0029] 6- Solder;

[0030] 7- Rigid support components. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0032] In the description of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0033] See Figure 1The traditional main helium blower copper bar welding structure is as follows: the rotor copper bar 4 passes through the rotor lamination 1, ventilation slot plate 2, and rotor pressure ring 3, and the lower end of the rotor copper bar 4 is welded to the end face of the end ring 5. After welding, the lower end of the rotor copper bar 4 is connected to the end face of the end ring 5 through a round fillet weld. However, the connection area of ​​this fillet weld is relatively small, resulting in a relatively weak connection strength between the rotor copper bar 4 and the end ring 5, making it difficult to withstand large torques. This leads to the root of the connection between the rotor copper bar 4 and the end ring 5 being prone to breakage. This breakage not only damages the drive motor, seriously affecting the normal operation of the main helium blower, but also leads to frequent inspections and repairs during production, increasing maintenance costs.

[0034] To prevent breakage at the root of the connection between the rotor copper bar 4 and the end ring 5, see [reference needed]. Figure 2 In related technologies, a rigid support 7 is connected between the end ring 5 and the rotor pressure ring 3 so that the inertial torque of the end ring 5 acts on the rigid support 7, thereby reducing the inertial torque on the rotor copper bar 4 and preventing the root of the connection between the rotor copper bar 4 and the end ring 5 from breaking due to the large inertial torque.

[0035] However, while the related technology can prevent root fracture of the connection between the rotor copper bar 4 and the end ring 5 to some extent, it requires the additional rigid support 7. This not only increases the complexity of the structure but may also increase assembly difficulty, affecting overall production efficiency. Furthermore, the related technology does not fundamentally enhance the connection strength at the welded position between the rotor copper bar 4 and the end ring 5. Under higher torsional impacts, the root of the connection between the rotor copper bar 4 and the end ring 5 still poses a safety hazard of fracture, failing to fundamentally solve the problem of insufficient connection strength.

[0036] Based on this, see Figure 3 , Figure 4 , Figure 5 , Figure 6 This application provides a main helium blower copper bar welding structure, including an end ring 5 and a rotor copper bar 4. The end face of the end ring 5 is provided with an assembly groove 52, the bottom surface of the assembly groove 52 is provided with a solder groove 53 and a positioning platform 54 located on one side of the solder groove 53. One end of the rotor copper bar 4 is provided in the assembly groove 52 and positioned on the positioning platform 54. An annular solder space 55 is formed between the rotor copper bar 4 and the side of the assembly groove 52 and communicates with the solder groove 53. The solder space 55 and the solder groove 53 are filled with solder 6 for welding the end ring 5 and the rotor copper bar 4 together.

[0037] Specifically, the rotor copper bar 4 is arranged vertically and passes through the rotor lamination 1, ventilation slot plate 2 and rotor pressure ring 3. The rotor copper bar 4, rotor lamination 1, ventilation slot plate 2 and rotor pressure ring 3 are connected together using existing structures, which will not be described in detail here.

[0038] The end ring 5 is a circular structure located below the rotor copper bar 4. The upper surface of the end ring 5 has a plurality of mounting slots 52 evenly distributed around its circumference for mounting the lower ends of the rotor copper bars 4. The number of mounting slots 52 corresponds to the number of rotor copper bars 4, and each lower end of the rotor copper bar 4 is installed in its corresponding mounting slot 52. The size of the mounting slot 52 is larger than the size of the lower end of the rotor copper bar 4, so that after the lower end of the rotor copper bar 4 is inserted into the mounting slot 52, an annular solder space 55 for filling with solder 6 is formed between the rotor copper bar 4 and the side of the mounting slot 52, allowing the solder 6 to weld the side of the rotor copper bar 4 to the side of the mounting slot 52.

[0039] The bottom surface of the assembly slot 52 is provided with a solder groove 53 and a positioning platform 54. The positioning platform 54 is located on one side of the solder groove 53. The solder groove 53 is connected to the solder space 55 and is used to fill the solder 6. The positioning platform 54 is used to position the rotor copper bar 4 axially. When the lower end of the rotor copper bar 4 is inserted into the assembly slot 52, the end face of the lower end of the rotor copper bar 4 contacts the positioning platform 54, realizing the axial positioning of the rotor copper bar 4. This creates a space between the end face of the lower end of the rotor copper bar 4 and the bottom surface of the solder groove 53 for filling with solder 6, so that the end face of the rotor copper bar 4 can be welded to the bottom surface of the solder groove 53 using solder 6. The solder 6 can weld the rotor copper bar 4 to the end ring 5 by melting.

[0040] The welding process of the copper strip welding structure for the main helium blower provided in this embodiment is as follows:

[0041] First, the rotor copper bar 4 is vertically inserted into the assembly slot 52 of the end ring 5 through the rotor lamination 1, ventilation slot plate 2, and rotor pressure ring 3, and then placed as a whole in the medium-frequency induction heating equipment. The induction coil of the medium-frequency induction heating equipment fits well with the lower end face of the end ring 5. If there is a gap, a high-temperature resistant insulating board is used as a gasket. The lower end face of the rotor copper bar 4 is axially positioned on the positioning table 54. The horizontal position of the rotor copper bar 4 is adjusted so that an annular solder space 55 is formed between the rotor copper bar 4 and the side of the assembly slot 52, and the solder space 55 is connected to the solder tank 53, and its size meets the design requirements. Then, the solder 6 is placed on the upper end face of the end ring 5, the medium-frequency induction heating equipment is turned on, and the rotor copper bar 4 is heated one by one by the root of the solder bar 4 using a welding torch. When the solder 6 becomes wet, the solder 6 is applied to the solder space 55 with a welding rod. As the temperature of the solder 6 rises, the solder 6 melts and flows downward into the solder tank 53 until the solder tank 53 and the solder space 55 are filled.

[0042] The main helium blower copper bar welding structure provided in this application embodiment has an assembly groove 52 on the end face of the end ring 5, and a solder groove 53 and a positioning platform 54 on the bottom surface of the assembly groove 52. When one end of the rotor copper bar 4 is inserted into the assembly groove 52 and positioned on the positioning platform 54, a solder space 55 communicating with the solder groove 53 can be formed between the rotor copper bar 4 and the side of the assembly groove 52. During welding, the melted solder can fully fill the solder space 55 and the solder groove 53, so that the side and end face of the rotor copper bar 4 are firmly bonded to the end ring 5 through the solder. This significantly enhances the connection strength between the rotor copper bar 4 and the end ring 5, and avoids the problem of root breakage of the connection between the rotor copper bar 4 and the end ring 5 due to insufficient connection strength in traditional welding structures.

[0043] In some embodiments, see Figure 3 , Figure 4 , Figure 5 , Figure 6 The end face of the end ring 5 is provided with a feeding groove 51, and an assembly groove 52 is provided on the bottom surface of the feeding groove 51. The feeding grooves 51 can be arranged in two ways. The first arrangement is that the number of feeding grooves 51 corresponds to the number of assembly grooves 52, with several feeding grooves 51 evenly distributed circumferentially on the upper end face of the end ring 5. The bottom surface of each feeding groove 51 has a corresponding assembly groove 52, wherein the cross-sectional dimension of the feeding groove 51 is larger than the cross-sectional dimension of the assembly groove 52. The second arrangement is: [See...] Figure 6 The material discharge groove 51 can be an annular groove extending circumferentially along the end ring 5, and a number of assembly grooves 52 are evenly distributed around the bottom circumference of the annular groove.

[0044] Correspondingly, by setting a feeding groove 51 on the end face of the end ring 5, the solder 6 can be placed in the feeding groove 51 before welding. The side wall of the feeding groove 51 is used to limit the solder 6, preventing the solder 6 from accidentally falling from the upper end face of the end ring 5 due to vibration, gravity or other external forces during the welding process. This avoids rework or repair welding caused by the solder 6 falling, reduces interruptions and adjustments during the welding process, and improves the continuity of welding operations.

[0045] To further improve the connection strength between the rotor copper bar 4 and the end ring 5, in some embodiments, the feeding groove 51 is provided with solder 6 for welding the end ring 5 and the rotor copper bar 4 together. Depending on the processing technology, the assembly groove 52 can be an oblong groove or a rectangular groove. Of course, the assembly groove 52 can also be processed into other shapes of grooves, which are not specifically limited here.

[0046] In some embodiments, the bottom surface of the assembly groove 52 is provided with a plurality of solder grooves 53, and the portion of the bottom surface of the assembly groove 52 located between the plurality of solder grooves 53 forms a positioning stage 54, wherein the solder grooves 53 are disposed at the edge of the bottom surface of the assembly groove 52. Here, "a plurality of" refers to at least two. For example, see [link to example]. Figure 6 The bottom surface of the assembly slot 52 is provided with two solder slots 53, and a positioning platform 54 is formed between the two solder slots 53.

[0047] Correspondingly, by setting multiple solder grooves 53, more solder 6 can be accommodated, further increasing the connection strength between the end face of the rotor copper bar 4 and the end ring 5. After the multiple solder grooves 53 are processed, a positioning platform 54 can be formed between the multiple solder grooves 53, eliminating the need for a separate positioning platform 54 processing step, thus improving processing efficiency. By setting the solder grooves 53 at the bottom edge of the assembly groove 52, after the solder grooves 53 are processed, they can be connected to the solder space 55, without the need to additionally process a channel connecting the solder grooves 53 and the solder space 55 on the bottom surface of the assembly groove 52, reducing processing difficulty and further improving processing efficiency.

[0048] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A main helium blower copper bar welding structure, comprising an end ring (5) and a rotor copper bar (4), characterized in that, The end face of the end ring (5) is provided with an assembly groove (52), the bottom surface of the assembly groove (52) is provided with a solder groove (53) and a positioning platform (54) located on one side of the solder groove (53); one end of the rotor copper bar (4) is located in the assembly groove (52) and positioned on the positioning platform (54), and an annular solder space (55) communicating with the solder groove (53) is formed between the rotor copper bar (4) and the side of the assembly groove (52), and the solder space (55) and the solder groove (53) are filled with solder (6) for welding the end ring (5) and the rotor copper bar (4) together.

2. The main helium blower copper strip welding structure according to claim 1, characterized in that, The end face of the end ring (5) is provided with a feeding groove (51), and the assembly groove (52) is provided on the bottom surface of the feeding groove (51).

3. The main helium blower copper strip welding structure according to claim 2, characterized in that, The discharge trough (51) is an annular groove that extends circumferentially along the end ring (5).

4. The main helium blower copper strip welding structure according to claim 3, characterized in that, The feeding trough (51) is provided with solder (6) for welding the end ring (5) and the rotor copper bar (4) together.

5. The main helium blower copper strip welding structure according to claim 1, characterized in that, The assembly groove (52) is a waist-shaped groove or a rectangular groove.

6. The main helium blower copper strip welding structure according to claim 1, characterized in that, The bottom surface of the assembly groove (52) is provided with a plurality of solder grooves (53), and the portion of the bottom surface of the assembly groove (52) located between the plurality of solder grooves (53) forms the positioning platform (54).

7. The main helium blower copper strip welding structure according to claim 6, characterized in that, The solder groove (53) is located at the bottom edge of the assembly groove (52).

8. The main helium blower copper strip welding structure according to claim 6 or 7, characterized in that, The bottom surface of the assembly slot (52) is provided with two solder slots (53), and the positioning platform (54) is formed between the two solder slots (53).

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