Oversized current rectifying device

Abstract

The utility model discloses an ultra-large current rectifying device, which belongs to the technical field of power electronics and comprises a plurality of rectifier bridge arms and water-cooled busbars, the rectifier bridge arms and the water-cooled busbars are mounted on an inner frame of a rectifier cabinet, each rectifier bridge arm comprises a diode and a press-fitting structure, the diameter of a tube core of each diode is four inches, and the diameter of the press-fitting structure is four inches. The direct-current wire outlet ends of each rectifier bridge arm are symmetrically arranged at the upper end and the lower end of the rectifier bridge arm, and the current path lengths of the parallel branches are equal. According to the utility model, the current sharing capability, the heat dissipation efficiency and the long-term operation stability of the rectifying device are improved.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to an ultra-high current rectifier device. Background Technology

[0002] Previously, the DC output current of rectifier power supplies (single units) used in carbon graphitization furnaces (electric heating) was mostly below 250kA, or multiple units were connected in parallel to meet the high current requirements. Now, rectifier power supplies for carbon graphitization furnaces (electric heating) require a DC output current of 150×2=300kA (or 340kA) per unit, and a DC output current of 150kA (or 170kA) per rectifier cabinet. Therefore, innovation and improvement of rectifiers are needed.

[0003] Traditional rectifiers suffer from the following problems: they use 3-inch sintered diodes, have a large number of parallel branches in a single arm (e.g., 8), resulting in poor current sharing and localized overheating; the AC input and DC output terminals of the rectifier bridge arms are not arranged properly, and the current paths of each branch are significantly different, further worsening current sharing and causing serious localized overheating inside the rectifier cabinet, requiring double-sided water cooling for some fast-acting fuses; and most of the conductive busbars use small-section copper busbars, which are not strong enough to withstand the electrodynamic forces of large currents, resulting in excessive vibration and noise during the operation of the rectifier cabinet. Utility Model Content

[0004] The purpose of this invention is to improve the current sharing capacity, heat dissipation efficiency and long-term operational stability of the rectifier.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-current rectifier device, comprising multiple rectifier bridge arms and water-cooled busbars mounted on the inner frame of the rectifier cabinet, each rectifier bridge arm comprising a diode and a press-fit structure, the diode having a die diameter of four inches, the DC output terminals of each rectifier bridge arm being symmetrically arranged at the upper and lower ends of the rectifier bridge arm, and the current path lengths of each parallel branch being equal.

[0006] As a further description of the above technical solution: the number of parallel branches of the diode and press-fit structure is six, which reduces the number of parallel branches compared with the traditional low-current sintered diode and press-fit structure.

[0007] As a further description of the above technical solution: the water-cooled busbar is made of aluminum alloy with good electrical conductivity and high mechanical strength.

[0008] As a further description of the above technical solution: the water-cooled busbar adopts a built-in flow channel water-cooling structure to improve heat dissipation efficiency and reduce busbar temperature rise.

[0009] As a further description of the above technical solution: the insulation between the rectifier bridge arms is made of high-temperature resistant composite insulation material to prevent dielectric breakdown in high-temperature environments.

[0010] As a further description of the above technical solution: the symmetrical bus configuration combined with the valve-side inlet position ensures that the branch path lengths within the rectifier bridge arm are equal, improving the current sharing effect and preventing excessive temperature rise or localized overheating of core components.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] 1. By replacing the traditional eight three-inch sintered diodes with six four-inch fully press-fit diodes, the number of parallel branches is reduced by 25%, making the current distribution of each branch more uniform, improving the current sharing coefficient, and reducing the risk of overload in individual branches.

[0013] 2. Optimize the arrangement of the DC output terminals by moving them from the traditional middle position to the upper and lower ends of the rectifier bridge arm. This ensures that the current path length of each parallel branch is equal, effectively improving the current sharing capacity, reducing local heat generation, and enhancing the reliability of the rectifier device. Attached Figure Description

[0014] Figure 1 This invention relates to the layout of AC and DC input / output lines of the rectifier cabinet.

[0015] Figure 2 This invention provides a schematic diagram of the AC / DC input and output lines of the rectifier bridge arm.

[0016] Figure 3 The diagram shows the AC / DC input / output line layout of the conventional rectifier cabinet of this utility model;

[0017] Figure 4 The diagram shows a conventional AC / DC input / output line of the rectifier bridge arm of this utility model.

[0018] Legend:

[0019] 10. Water-cooled busbar; 11. Rectifier bridge arm; 12. Diode and press-fit structure; 13. DC output terminal. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4 This utility model provides a technical solution: an ultra-high current rectifier device, including multiple rectifier bridge arms 11 and water-cooled busbars 10 mounted on the frame inside the rectifier cabinet. Each rectifier bridge arm 11 includes six fully press-fit diodes and press-fit structures 12, replacing the existing requirement of eight parallel three-inch sintered diodes and press-fit structures. Each rectifier bridge arm 11 reduces two diodes and press-fit structures 12, thereby reducing the number of parallel branches, making the current distribution of each branch more balanced, and improving the current sharing coefficient.

[0022] Furthermore, the diode adopts a four-inch die diameter fully pressurized design. Compared with the traditional three-inch sintered diode, the four-inch fully pressurized diode has a higher conduction current capability and can reduce the current density per unit area, thereby effectively reducing local heat generation and further improving the stability and reliability of the rectifier.

[0023] Furthermore, the DC output terminals 13 of each rectifier bridge arm 11 are symmetrically arranged at the upper and lower ends of the rectifier bridge arm 11, and the current path lengths of each parallel branch are equal. Previously, the DC output terminals 13 were located in the middle, such as... Figure 3 As shown, this application moves the DC output terminal 13 of each rectifier bridge arm 11 from the middle part to the upper and lower ends for output and bus, respectively. Figure 1 As shown, this ensures that the path length of the current flowing through each branch in the rectifier bridge arm 11 is equal, effectively improving the current sharing capacity, reducing local heating, and improving the reliability of the rectifier device.

[0024] Furthermore, the water-cooled busbar 10 is made of high-strength conductive aluminum alloy, and its cross-sectional area is more than twice that of the traditional copper busbar. The use of a larger cross-section busbar improves the mechanical strength and vibration resistance of the busbar.

[0025] Furthermore, the water-cooled busbar 10 adopts a built-in flow channel water-cooling structure to improve heat dissipation efficiency and reduce busbar temperature rise. That is, a coolant flow channel is provided inside the busbar, so that the coolant can flow evenly along the entire structure of the busbar, thereby improving the heat dissipation efficiency of the busbar.

[0026] Furthermore, the insulation between the rectifier bridge arms 11 is made of high-temperature resistant composite insulation material, which can effectively prevent dielectric breakdown in high-temperature environments and ensure safe isolation between the rectifier bridge arms 11.

[0027] Furthermore, the symmetrical bus configuration combined with the valve-side inlet position ensures that the branch path lengths within the rectifier bridge arm 11 are equal, improving the current sharing effect and preventing excessive temperature rise or localized overheating of core components.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A super-current rectifier device comprising a plurality of rectifier bridge arms (11) and water-cooled busbars (10) mounted on a frame in a rectifier cabinet, characterized in that: Each of the rectifier bridge arms (11) includes a diode and a press-fit structure (12). The diode has a die diameter of four inches. The DC output terminals (13) of each rectifier bridge arm (11) are symmetrically arranged at the upper and lower ends of the rectifier bridge arm (11), and the current path lengths of each parallel branch are equal.

2. A high current rectifier device according to claim 1, wherein: The diode and press-fit structure (12) have six parallel branches.

3. A high current rectifier device according to claim 1, wherein: The water-cooled busbar (10) is made of aluminum alloy.

4. A high current rectifier device according to claim 3, wherein: The water-cooled busbar (10) adopts a built-in flow channel water-cooling structure.

5. A high current rectifier device according to claim 1, wherein: The rectifier bridge arms (11) are isolated by high-temperature resistant composite insulation material.

6. A high current rectifier device according to claim 1, wherein: The branch paths within the rectifier bridge arm (11) are of equal length.

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