Composite load-tap-changer moving contact head solderless coupling structure

Abstract

The application discloses a kind of composite load-tap changer dynamic load current contactor welding-free coupling structure, including insulating support, metal support, connecting wire and contact, the contact includes upper contact and lower contact, metal support is installed on insulating support, insulating support and metal support all have accommodating space, upper contact is installed in the accommodating space on insulating support, while lower contact is installed in the accommodating space on metal support, and accommodating cavity is respectively arranged in upper contact and lower contact;The upper end of the connecting wire is fixedly connected in the accommodating cavity in upper contact, while its lower end is fixedly connected in the accommodating cavity in lower contact.The welding-free coupling structure of the application is connected and fixed by crimping, the contact is reliable, not easy to loosen, and its size is easy to control, with simple and convenient operation, easy to assemble, easy to mass-produce, with strong practicability, suitable for popularization and use.

Description

Technical Field

[0001] This invention relates to the field of transformer tap changer technology, and specifically to a composite on-load tap changer with a weldless connection structure for the moving current-carrying contact. Background Technology

[0002] A composite on-load tap changer refers to an on-load switch that integrates a switching switch and a tap selector, used for output voltage regulation. In existing composite on-load tap changers, the moving current-carrying contacts all adopt a welded structure. The most significant disadvantages of this welded structure are as follows: First, a small gap exists between the two welded parts. During welding, it is difficult for the welding flux to fill this gap, resulting in air bubbles in the weld and unreliable contact between the two live parts. Second, impurities can easily mix into the welding flux during welding, leading to weak welds or weakening the current-carrying capacity of the contacts, thus affecting switch performance. Third, multiple welding operations are required to ensure reliable welding, making it difficult to control the weld dimensions and demanding a high level of skill from the welder. Fourth, if welding flux leaks out during welding, it can cause stiffness, jamming, or even complete blockage in areas requiring flexible rotation.

[0003] Therefore, it is evident that existing composite on-load tap changers employ a welded structure for their moving current-carrying contacts. This results in a low product qualification rate during manufacturing, leading to high production costs and hindering mass production. Furthermore, it poses significant safety hazards and risks during application, negatively impacting market competitiveness. To improve product qualification rates and processing efficiency, ensure tap changer quality, and enhance market competitiveness, it is necessary to improve the existing welding method, thereby providing a weld-free connection structure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background art by providing a weldless connection structure, which is conducive to mass production, reduces production costs, improves product qualification rate and processing efficiency, ensures the quality of tap changers, eliminates safety hazards, and enhances market competitiveness. Specifically, it is a composite on-load tap changer moving current-carrying contact weldless connection structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a composite on-load tap changer moving current-carrying contact weldless connection structure, including an insulating support, a metal support, a connecting wire, and contacts. The contacts include an upper contact and a lower contact. The metal support is mounted on the insulating support. Both the insulating support and the metal support have accommodating spaces. The upper contact is mounted on the insulating support through the accommodating space on the insulating support, and the lower contact is mounted on the metal support through the accommodating space on the metal support. Accommodating cavities are respectively provided in the upper contact and the lower contact. The upper end of the connecting wire is fixedly connected to the upper contact through the accommodating cavity in the upper contact, and its lower end is fixedly connected to the lower contact through the accommodating cavity in the lower contact.

[0006] Furthermore, the composite on-load tap changer moving current-carrying contact solderless connection structure of the present invention further includes washers and retaining rings. The washers include an upper washer and a lower washer, and the retaining rings include an upper retaining ring and a lower retaining ring. The upper washer and the upper retaining ring are both installed on the upper contact. The upper retaining ring is used to limit the installation position of the upper contact on the insulating support and to adjust the assembly gap of the upper contact on the insulating support. The lower washer and the lower retaining ring are both installed on the lower contact. The lower retaining ring is used to limit the installation position of the lower contact on the metal support and to adjust the assembly gap of the lower contact on the metal support.

[0007] The composite on-load tap changer's weldless connection structure for moving current-carrying contacts, as described in this invention, offers several advantages over existing technologies. By providing a receiving cavity on the contact, placing the connecting wire within this cavity, and using a specialized tool to press the contact, reliable contact and fixing of the connecting wire are achieved. This effectively avoids the defects associated with welding connections. Therefore, the weldless connection structure of this invention, using a pressing method for connection and fixing, ensures reliable, firm, and secure contact, preventing loosening. Furthermore, its dimensions are easily controlled, making it simple and convenient to operate and assemble. It requires less technical skill from operators, facilitates mass production, and is highly practical, making it suitable for widespread use. Attached Figure Description

[0008] The present invention will now be described in further detail with reference to the accompanying drawings.

[0009] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the AA-direction structure; Figure 3 This is a schematic diagram of the upper contact structure described in this invention; Figure 4 This is a schematic diagram of the lower contact structure described in this invention; Figure 5 This is a schematic diagram of the connecting line structure described in this invention.

[0010] As shown in the attached diagram: 1-Insulating bracket, 2-Upper contact, 3-Connecting wire, 4-Upper washer, 5-Upper retaining ring, 6-Metal bracket, 7-Lower contact, 8-Lower retaining ring, 9-Lower washer. Detailed Implementation

[0011] To further illustrate the concept of the present invention, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings: like Figures 1 to 5 As shown, the present invention discloses a composite on-load tap changer moving current-carrying contact weldless connection structure, comprising an insulating support 1, a metal support 6, a connecting wire 3, and contacts. The contacts include two identical upper contacts 2 and lower contacts 7. The metal support 6 is mounted on the insulating support 1. Both the insulating support 1 and the metal support 6 have accommodating spaces. The upper contact 2 is mounted on the insulating support 1 through the accommodating space on the insulating support 1, and the lower contact 7 is mounted on the metal support 6 through the accommodating space on the metal support 6. Accommodating cavities are respectively provided in the upper contact 2 and the lower contact 7. The upper end of the connecting wire 3 is fixedly connected to the upper contact 2 through the accommodating cavity in the upper contact 2, and its lower end is fixedly connected to the lower contact 2 through the accommodating cavity in the lower contact 7.

[0012] Furthermore, in the composite on-load tap changer dynamic current-carrying contact solderless connection structure of the present invention, the upper contact 2 and the lower contact 7 are both formed into a T-shaped structure by a connecting part and a supporting part. The upper contact 2 passes through the receiving space in the insulating bracket 1 through the connecting part and is fixedly connected to the insulating bracket 1. The lower contact 7 passes through the receiving space in the metal bracket 6 through the connecting part and is fixedly connected to the metal bracket 6. The supporting parts constituting the upper contact 2 and the lower contact 7 are respectively in contact with the outer surface of the corresponding receiving space.

[0013] Furthermore, in the composite on-load tap changer contact without solder joint structure described in this invention, the connecting wire 3 is a cylindrical structure, and the accommodating cavity in the upper contact 2 and lower contact 7 is a blind hole. The diameter of the blind hole matches the outer diameter of the connecting wire 3, and the blind hole is arranged along the axial direction of the connection portion. Multiple inwardly recessed first limiting surfaces are provided at the upper and lower ends of the connecting wire 3, and a first supporting surface corresponding to the first limiting surface is provided within the blind hole. The upper and lower ends of the connecting wire 3 are fixedly connected to the upper contact 2 and lower contact 7 through the corresponding first limiting surface and first supporting surface. In the specific manufacturing process, four first limiting surfaces are provided, evenly distributed in a ring around the circumference of the connecting wire 3. The first supporting surface corresponds to the first limiting surface and is evenly distributed in a ring on the inner wall of the blind hole. The first limiting surface and first supporting surface effectively prevent relative rotation of the connecting wire 3 between the upper contact 2 and lower contact 7.

[0014] Furthermore, in the composite on-load tap changer dynamic current-carrying contact weldless connection structure of the present invention, a guide hole is provided in the support part of the lower contact 7. The guide hole is arranged along the axial direction of the lower contact 7 and communicates with its receiving cavity.

[0015] Furthermore, in the composite on-load tap changer moving current-carrying contact weldless connection structure of the present invention, the accommodating space in the insulating bracket 1 and the metal bracket 6 is a through hole. The diameter of the through hole matches the outer diameter of the connecting portion in the upper contact 2 and the lower contact 7. A second limiting surface with an inwardly recessed feature is provided on the outer side of the connecting portion, and a second supporting surface corresponding to the second limiting surface is provided in the through hole. The upper contact 2 and the lower contact 7 respectively cooperate with the corresponding second limiting surface and the second supporting surface to achieve a fixed connection between the upper contact 2 and the insulating bracket 1 and between the lower contact 7 and the metal bracket 6. The second limiting surface and the second supporting surface can effectively prevent relative rotation of the upper contact 2 and the lower contact 7 during installation.

[0016] Furthermore, the composite on-load tap changer moving current-carrying contact solderless connection structure of the present invention further includes washers and retaining rings. The washers include an upper washer 4 and a lower washer 9, and the retaining rings include an upper retaining ring 5 and a lower retaining ring 8. The upper washer 4 and the upper retaining ring 5 are both mounted on the upper contact 2. The upper retaining ring 5 is used to limit the installation position of the upper contact 2 on the insulating support 1, and the upper washer 4 is used to adjust the assembly gap of the upper contact 2 on the insulating support 1. The lower washer 9 and the lower retaining ring 8 are both mounted on the lower contact 7. The lower retaining ring 8 is used to limit the installation position of the lower contact 7 on the metal support 6, and the lower washer 9 is used to adjust the assembly gap of the lower contact 7 on the metal support 6. Through the provided washers and retaining rings, not only can the installation positions of the upper contact 2 and the lower contact 7 be determined, but the assembly gaps between the upper contact 2 and the insulating support 1, and between the lower contact 7 and the metal support 6, can also be adjusted.

[0017] The composite on-load tap changer's dynamic current-carrying contact weldless connection structure described in this invention is installed as follows: First, the upper end of the connecting wire 3 is inserted into the receiving cavity of the upper contact 2, and a special tool is used to press the connecting wire 3 and the upper contact 2 together until there is no looseness. Then, the insulating bracket 1 is installed on the pressed upper contact 2, and then the upper washer 4 is installed to adjust its assembly gap, and the upper retaining ring 5 is used to limit the installation position of the upper contact 2 to ensure the correct installation dimensions. Using the same installation method, the lower end of the connecting wire 3 is first inserted into the receiving cavity of the lower contact 7, and a special tool is used to press the connecting wire 3 and the lower contact 7 together until there is no looseness. Then, the metal bracket 6 is installed on the pressed lower contact 7, and then the position of the lower contact 7 is adjusted by the lower washer 9, and the lower retaining ring 8 is used to limit the position to ensure the installation dimensions of the lower contact 7. Finally, the insulating bracket 1 and the metal bracket 6 are fixedly connected using the existing connection method.

[0018] By employing the weldless connection structure described in this invention, a receiving cavity is provided on the contact, the connecting wire is placed in the receiving cavity, and a special tool is used to press the contact, so that the contact and the connecting wire can achieve reliable contact and fixation, which can effectively avoid the defects caused by fixing the connection by welding.

[0019] In summary, the weldless connection structure described in this invention, which uses a press-fit method for connection and fixation, ensures reliable and firm contact, prevents loosening, and is easy to control in terms of size. It is simple and convenient to operate, easy to assemble, requires low technical skills from operators, is easy to mass-produce, and is highly practical and suitable for widespread use.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite on-load tap changer with a weldless connection structure for the moving current-carrying contact, characterized in that, Including: An insulating support (1) having an accommodating space; A metal bracket (6) is mounted on an insulating bracket (1) and has a receiving space. The contact includes an upper contact (2) and a lower contact (7). The upper contact (2) is installed in the receiving space on the insulating support (1), while the lower contact (7) is installed in the receiving space on the metal support (6). Receiving cavities are provided in the upper contact (2) and the lower contact (7). The upper end of the connecting line (3) is fixedly connected to the accommodating cavity in the upper contact (2), and its lower end is fixedly connected to the accommodating cavity in the lower contact (7). The upper contact (2) and the lower contact (7) are both T-shaped structures formed by connecting parts and supporting parts. The upper contact (2) passes through the accommodating space in the insulating bracket (1) through the connecting part and is fixedly connected to the insulating bracket (1). The lower contact (7) passes through the accommodating space in the metal bracket (6) through the connecting part and is fixedly connected to the metal bracket (6). The supporting parts that make up the upper contact (2) and the lower contact (7) are respectively in contact with the outer side of the corresponding accommodating space. The accommodating space in the insulating bracket (1) and the metal bracket (6) is a through hole. The diameter of the through hole matches the outer diameter of the connecting part in the upper contact (2) and the lower contact (7). A second limiting surface that is recessed inward is provided on the outer side of the connecting part, and a second supporting surface corresponding to the second limiting surface is provided in the through hole. The upper contact (2) and the lower contact (7) cooperate with the second supporting surface through the corresponding second limiting surface to realize the fixed connection between the upper contact (2) and the insulating bracket (1) and between the lower contact (7) and the metal bracket (6).

2. The composite on-load tap changer moving current-carrying contact weldless connection structure according to claim 1, characterized in that: The connecting line (3) is a cylindrical structure. The accommodating cavity in the upper contact (2) and lower contact (7) is a blind hole. The diameter of the blind hole matches the outer diameter of the connecting line (3). The blind hole is arranged along the axial direction of the connecting part. Multiple inwardly recessed first limiting surfaces are provided at the upper and lower ends of the connecting line (3). A first supporting surface corresponding to the first limiting surface is provided in the blind hole. The upper and lower ends of the connecting line (3) cooperate with the first supporting surface through the corresponding first limiting surface to realize the fixed connection between the connecting line (3) and the upper contact (2) and the lower contact (7).

3. The composite on-load tap changer moving current-carrying contact weldless connection structure according to claim 2, characterized in that: The first limiting surface is provided with four, and the four first limiting surfaces are evenly distributed in a ring around the circumference of the connecting line (3). The first supporting surface corresponds to the first limiting surface and is evenly distributed in a ring on the inner wall surface of the blind hole.

4. The composite on-load tap changer moving current-carrying contact weldless connection structure according to claim 2, characterized in that: The lower contact (7) is also provided with a guide hole in its support portion. The guide hole is arranged along the axial direction of the lower contact (7) and communicates with its receiving cavity.

5. The composite on-load tap changer moving current-carrying contact weldless connection structure according to claim 1, characterized in that: It also includes washers and retaining rings. The washers include an upper washer (4) and a lower washer (9), and the retaining rings include an upper retaining ring (5) and a lower retaining ring (8). The upper washer (4) and the upper retaining ring (5) are both installed on the upper contact (2). The upper retaining ring (5) is used to limit the installation position of the upper contact (2) on the insulating support (1), and the upper washer (4) is used to adjust the assembly gap of the upper contact (2) on the insulating support (1). The lower washer (9) and the lower retaining ring (8) are both installed on the lower contact (7). The lower retaining ring (8) is used to limit the installation position of the lower contact (7) on the metal support (6), and the lower washer (9) is used to adjust the assembly gap of the lower contact (7) on the metal support (6).

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