A submersible thyristor valve assembly structure

Abstract

This utility model discloses a submerged thyristor valve group structure, relating to the field of power electronic device technology. It includes: a valve group oil tank, which is a hollow shell containing insulating oil; a single-phase thyristor valve group, disposed within the oil tank and immersed in the insulating oil, used for power conversion and control; and a resistive-capacitive (RC) absorption component, disposed within the oil tank, connected to the single-phase thyristor valve group and immersed in the insulating oil, used to limit the current and voltage of the single-phase thyristor valve group. The submerged thyristor valve group structure provided in this application, by connecting the single-phase thyristor valve group and the RC absorption component, and having both immersed in the insulating oil within the valve group oil tank, improves the heat dissipation efficiency of the single-phase thyristor valve group and the RC absorption component through the insulating oil.

Description

Technical Field

[0001] This utility model relates to the field of power electronic device technology, and more specifically, to an immersion-type thyristor valve assembly structure. Background Technology

[0002] A thyristor valve assembly is a power electronic device composed of multiple thyristors connected in series or parallel. It is mainly used for power conversion and control in high-voltage, high-current scenarios. Its main applications include high-voltage direct current transmission, industrial power control, flexible AC transmission, and new energy fields, with wide applications and high demand.

[0003] Due to their multi-stage series and parallel configurations, thyristor valve assemblies involve high voltage levels, large currents, and significant heat generation. Sufficient electrical clearances and heat dissipation are crucial in their design to ensure safe and stable operation. This results in large thyristor valve assembly sizes and inconvenient installation and use.

[0004] In summary, how to improve the heat dissipation efficiency of thyristor valve assemblies is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an immersion-type thyristor valve assembly structure, which immerses the single-phase thyristor valve assembly and the RC absorption component in the insulating oil in the valve assembly oil tank, and uses the insulating oil to dissipate heat from the single-phase thyristor valve assembly and the RC absorption component, thereby improving the heat dissipation efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A submersible thyristor valve assembly structure includes:

[0008] The valve group oil tank is a hollow shell, and insulating oil is installed inside it;

[0009] A single-phase thyristor valve assembly is located in the valve assembly oil tank and immersed in the insulating oil. The single-phase thyristor valve assembly is used for power conversion and control.

[0010] A resistive-capacitive absorption component is disposed in the oil tank of the valve group. The resistive-capacitive absorption component is connected to the single-phase thyristor valve group and is immersed in the insulating oil. The resistive-capacitive absorption component is used to limit the current and voltage of the single-phase thyristor valve group.

[0011] Preferably, the valve group oil tank has heat dissipation fins on at least three surfaces on its outer periphery, the heat dissipation fins being used to improve the heat dissipation efficiency of the insulating oil.

[0012] Preferably, the single-phase thyristor valve group includes a valve group base, a lower insulating column, a bus output row, a thyristor, a bus, a bus input row, an upper insulating column, a valve group pressure plate, and a valve group clamping insulating screw assembly. The valve group base and the valve group pressure plate are connected by the valve group clamping insulating screw assembly. The lower insulating column, the bus output row, the thyristor, the bus, the bus input row, and the upper insulating column are sequentially arranged between the valve group base and the valve group pressure plate.

[0013] Preferably, there are at least five thyristors and at least four busbars, with the thyristors and busbars arranged alternately.

[0014] Preferably, the RC absorption assembly includes a lower fixed plate, a capacitor insulating mounting plate, a capacitor, a resistor insulating mounting plate, a resistor, and an upper fixed plate. The lower fixed plate and the upper fixed plate are connected through the capacitor insulating mounting plate and the resistor insulating mounting plate. The capacitor is disposed on the capacitor insulating mounting plate, and the resistor is disposed on the resistor insulating mounting plate.

[0015] Preferably, there is one capacitor insulating mounting plate and two resistor insulating mounting plates, and the capacitor insulating mounting plates and resistor insulating mounting plates are arranged in parallel. Each capacitor insulating mounting plate has at least five capacitors and each resistor insulating mounting plate has at least five resistors.

[0016] Preferably, the lower fixing plate, the upper fixing plate, the valve group base, and the valve group pressure plate are all provided with connection and fixing holes.

[0017] Preferably, the valve group oil tank is provided with at least three of the single-phase thyristor valve groups and at least three of the resistor-capacitor absorption components.

[0018] Preferably, the valve group oil tank is provided with at least six inlet and outlet terminals.

[0019] Preferably, the valve group oil tank is provided with a valve group mounting seat inside, which is used to install the single-phase thyristor valve group and the RC absorption component.

[0020] This utility model provides an immersion-type thyristor valve assembly structure, in which a unidirectional thyristor valve assembly and a resistive-capacitive absorption component are connected and arranged, and both are immersed in insulating oil in the valve assembly oil tank. The insulating oil has high insulation performance, which can effectively isolate live parts, prevent electric arc and short circuit, and enhance the safety of the equipment. In addition, the insulating oil has high heat dissipation capacity and thermal conductivity, and its heat dissipation efficiency is better than dry cooling. Compared with conventional water cooling, the structure of this application is simple and easy to install. Oil immersion can prevent the single-phase thyristor valve assembly and the resistive-capacitive absorption component from oxidation or moisture, extend the service life of the equipment, slow down the aging of the insulation material, and can also quickly extinguish the electric arc to avoid the expansion of the fault. The cost is low and the maintenance technology is mature. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the single-phase thyristor valve assembly provided by this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the resistor-capacitor absorption component provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the single-phase valve assembly provided by this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of the multiphase valve assembly provided by this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the valve group oil tank provided by this utility model;

[0027] Figure 6 This is a schematic diagram of the submersible thyristor valve assembly structure provided by this utility model.

[0028] Figure 7 This is a circuit diagram of the multiphase valve group provided by this utility model.

[0029] Figure label:

[0030] 1-Valve assembly oil tank; 2-Single-phase thyristor valve assembly; 201-Valve assembly base; 202-Lower insulating column; 203-Bus output busbar; 204-Thyristor; 205-Busbar; 206-Bus input busbar; 207-Upper insulating column; 208-Valve assembly pressure plate; 209-Valve assembly clamping insulating screw assembly; 3-RC absorption assembly; 301-Lower fixing plate; 302-Capacitor insulating mounting plate; 303-Capacitor; 304-Resistor insulating mounting plate; 305-Resistor; 306-Upper fixing plate; 307-Connection fixing hole; 4-Inlet / outlet terminal block; 5-Valve assembly mounting base; 6-Multi-phase valve assembly; 7-Heat dissipation fins. Detailed Implementation

[0031] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The core of this utility model is to provide an immersed silicon controlled rectifier valve group structure. The single-phase silicon controlled rectifier valve group and the resistance-capacitance absorption component of this structure are set in the valve group oil tank and immersed in insulating oil to improve heat dissipation efficiency.

[0033] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to 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.

[0034] This application provides a submersible thyristor valve assembly structure, including: valve assembly oil tank 1, single-phase thyristor valve assembly 2 and RC absorption component 3;

[0035] Among them, valve group oil tank 1 is a hollow shell, and insulating oil is installed inside it;

[0036] The single-phase thyristor valve group 2 is located in the valve group oil tank 1 and is immersed in insulating oil. The single-phase thyristor valve group 2 is used for power conversion and control.

[0037] The RC absorption component 3 is located inside the valve group oil tank 1. The RC absorption component 3 is connected to the single-phase thyristor valve group 2 and is immersed in insulating oil. The RC absorption component 3 is used to limit the current and voltage of the single-phase thyristor valve group 2.

[0038] Specifically, the structure of valve group oil tank 1 can be found in the attached diagram. Figure 5 With appendix Figure 6The valve group oil tank 1 is a hollow shell with an opening at its top, through which insulating oil can be introduced. Inside the valve group oil tank 1, there is also a single-phase thyristor valve group 2 and a resistor-capacitor absorption assembly 3. The single-phase thyristor valve group 2 generates a large amount of heat, which can be absorbed by the insulating oil. Furthermore, insulating oil cooling has the following advantages: high insulation performance, effectively isolating live parts, preventing arcing and short circuits, and enhancing equipment safety. For example, the electrical gap of 12KV electrical equipment is 125mm in air, while in insulating oil, the electrical gap only needs to be 30-40mm, effectively reducing the design volume of the equipment; and high heat dissipation capacity and thermal conductivity, with heat dissipation efficiency significantly better than dry cooling.

[0039] Optionally, the insulating oil can be transformer oil.

[0040] Based on the above embodiment, at least three surfaces on the outer periphery of the valve group oil tank 1 are provided with heat dissipation fins 7, which are used to improve the heat dissipation efficiency of the insulating oil.

[0041] For details, please refer to the appendix. Figure 5 With appendix Figure 6 The valve group oil tank 1 has a cuboid structure, and heat dissipation fins 7 are provided on at least three surfaces of its outer perimeter. There are multiple heat dissipation fins 7, and the multiple heat dissipation fins 7 are arranged parallel to each other. The insulating oil can be dissipated through the heat dissipation fins on the outside of the valve group oil tank 1. Compared with the conventional water cooling method, which is connected to the water cooling radiator by water pipes, the pipeline is complicated and there is a risk of leakage. The heat dissipation fin 7 setting scheme has a simple structure and is easy to install.

[0042] It should be noted that the valve group oil tank 1 is designed according to the standard design of oil transformer oil tank. The outer shell of the valve group oil tank 1 is equipped with heat dissipation fins 7 to increase the heat diffusion area of ​​the insulating oil, reduce the temperature of the insulating oil inside the valve group oil tank 1, and better dissipate heat from the valve group components.

[0043] In some embodiments, the single-phase thyristor valve group 2 includes a valve group base 201, a lower insulating column 202, a bus output row 203, a thyristor 204, a bus 205, a bus input row 206, an upper insulating column 207, a valve group pressure plate 208, and a valve group clamping insulating screw assembly 209. The valve group base 201 and the valve group pressure plate 208 are connected by the valve group clamping insulating screw assembly 209. The lower insulating column 202, the bus output row 203, the thyristor 204, the bus 205, the bus input row 206, and the upper insulating column 207 are sequentially arranged between the valve group base 201 and the valve group pressure plate 208.

[0044] Specifically, the structure of the single-phase thyristor valve group 2 can be found in the attached diagram. Figure 1The valve assembly consists of, from bottom to top, a valve base 201, a lower insulating column 202, a busbar output 203, a thyristor 204, a busbar 205, a busbar input 206, an upper insulating column 207, and a valve pressure plate 208. The valve base 201 and the valve pressure plate 208 are connected by a valve clamping insulating screw assembly 209. The valve clamping insulating screw assembly 209 includes a screw and a nut. The screw passes through the valve base 201 and the valve pressure plate 208, and one end of the screw passing through the valve pressure plate 208 is provided with an external thread, which can be tightened and fixed with the nut. The number of valve clamping insulating screw assemblies 209 is determined according to the required torque and stability requirements, and there are generally four, distributed at the four corners of the valve base 201 and the valve pressure plate 208.

[0045] Based on the above embodiments, at least five silicon controlled rectifiers 204 and at least four busbars 205 are provided, and the silicon controlled rectifiers 204 and busbars 205 are arranged alternately.

[0046] Specifically, a large current flows through the single-phase thyristor valve group 2 during operation. Alternating between the thyristors 204 and busbars 205 allows the current to be distributed among the multiple thyristors 204 and busbars 205. When the number is set to four or more groups, this distribution becomes more uniform, preventing excessively high local current density.

[0047] Furthermore, the alternating arrangement increases the spacing between adjacent silicon controlled rectifiers (SCRs) 204, allowing air or other cooling media to flow more easily between them. Simultaneously, the busbars 205 serve as auxiliary heat dissipation paths, conducting away some heat. When there are four or more such busbars, this heat dissipation effect becomes more pronounced, forming a more effective heat dissipation network.

[0048] Based on the above embodiments, the RC absorption assembly 3 includes a lower fixing plate 301, a capacitor insulating mounting plate 302, a capacitor 303, a resistor insulating mounting plate 304, a resistor 305, and an upper fixing plate 306. The lower fixing plate 301 and the upper fixing plate 306 are connected through the capacitor insulating mounting plate 302 and the resistor insulating mounting plate 304. The capacitor 303 is disposed on the capacitor insulating mounting plate 302, and the resistor 305 is disposed on the resistor insulating mounting plate 304.

[0049] Specifically, the structure of the resistor-capacitor absorption component 3 can be found in the attached diagram. Figure 2Compared to the unidirectional thyristor valve group 2, which requires a centralized design, the RC absorption assembly 3 includes a lower fixed plate 301, a capacitor insulating mounting plate 302, a capacitor 303, a resistor insulating mounting plate 304, a resistor 305, and an upper fixed plate 306 arranged from bottom to top. The lower fixed plate 301 and the upper fixed plate 306 are arranged horizontally and are connected to each other through the capacitor insulating mounting plate 302 and the resistor insulating mounting plate 304. The number of capacitors and resistors is set according to electrical requirements.

[0050] Based on the above embodiment, there is one capacitor insulating mounting plate 302 and two resistor insulating mounting plates 304. The capacitor insulating mounting plate 302 and the resistor insulating mounting plate 304 are arranged in parallel. Each capacitor insulating mounting plate 302 is provided with at least five capacitors 303 and each resistor insulating mounting plate 304 is provided with at least five resistors 305.

[0051] For details, please refer to the appendix. Figure 2 With appendix Figure 7 In a RC snubber circuit, when an overvoltage occurs, capacitor 303 charges rapidly to absorb the energy. Resistor 305 limits the current in the charging circuit. If there are too few resistors 305, the charging current may be too large, causing the voltage across capacitor 303 to rise too quickly, exceeding its withstand voltage and damaging the capacitor.

[0052] Based on the above embodiments, the lower fixing plate 301, the upper fixing plate 306, the valve group base 201 and the valve group pressure plate 208 are all provided with connection fixing holes 307.

[0053] Specifically, the lower fixing plate 301 corresponds to the connection fixing hole 307 on the valve group base 201, and the two can be detached by threaded connection. The upper fixing plate 306 corresponds to the connection fixing hole 307 on the valve group pressure plate 208, so as to realize the detachable connection between the two. The single-phase thyristor valve group 2 and the RC absorption component 3 are fixed together by bolts, which facilitates modular production.

[0054] In some embodiments, the valve group oil tank 1 is provided with at least three single-phase thyristor valve groups 2 and at least three resistor-capacitor absorption components 3.

[0055] Specifically, at least three single-phase thyristor valve groups 2 and at least three resistor-capacitor absorption components 3 can be simultaneously installed in the valve group tank 1 to form a multiphase valve group 6. The structure of the multiphase valve group 6 can be referred to the appendix. Figure 4 .

[0056] Based on the above embodiment, the valve group oil tank 1 is provided with at least six inlet and outlet terminal blocks 4.

[0057] Specifically, the inlet and outlet terminals 4 are designed to be located close to the corresponding positions of the bus input 206 and the bus output 203, which facilitates the electrical connection between the valve group bus input 206 and the bus output 203 and the inlet and outlet terminals, making the connection simpler and more convenient, and avoiding the need for more space for wiring installation, thereby reducing the size of the thyristor valve group.

[0058] In some embodiments, the valve assembly oil tank 1 is provided with a valve assembly mounting seat 5 inside, which is used to install a single-phase thyristor valve assembly 2 and a resistor-capacitor absorption assembly 3.

[0059] Specifically, the bottom of the single-phase thyristor valve group 2 and the RC absorption component 3 are both designed with fixing holes, and the bottom surface of the valve group oil tank 1 is designed with a valve group mounting seat 5, which facilitates the reliable connection and fixation between the single-phase thyristor valve group 2, the RC absorption component 3 and the body of the valve group oil tank 1, so that the equipment is safe and reliable during transportation.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above provides a detailed description of the submersible thyristor valve assembly structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A submersible thyristor valve assembly structure, characterized in that, include: The valve group oil tank (1) is a hollow shell, and insulating oil is installed inside it; A single-phase thyristor valve group (2) is located in the valve group oil tank (1) and immersed in the insulating oil. The single-phase thyristor valve group (2) is used for power conversion and control. A resistor-capacitor absorption component (3) is disposed in the valve group oil tank (1). The resistor-capacitor absorption component (3) is connected to the single-phase thyristor valve group (2) and immersed in the insulating oil. The resistor-capacitor absorption component (3) is used to limit the current and voltage of the single-phase thyristor valve group (2).

2. The submersible thyristor valve assembly structure according to claim 1, characterized in that, The valve group oil tank (1) has at least three surfaces on its outer periphery provided with heat dissipation fins (7), which are used to improve the heat dissipation efficiency of the insulating oil.

3. The submersible thyristor valve assembly structure according to claim 1, characterized in that, The single-phase thyristor valve group (2) includes a valve group base (201), a lower insulating column (202), a bus output row (203), a thyristor (204), a busbar (205), a busbar input row (206), an upper insulating column (207), a valve group pressure plate (208), and a valve group clamping insulating screw assembly (209). The valve group base (201) and the valve group pressure plate (208) are connected by the valve group clamping insulating screw assembly (209). The lower insulating column (202), the busbar output row (203), the thyristor (204), the busbar (205), the busbar input row (206), and the upper insulating column (207) are arranged sequentially between the valve group base (201) and the valve group pressure plate (208).

4. The submersible thyristor valve assembly structure according to claim 3, characterized in that, At least five thyristors (204) are provided, and at least four busbars (205) are provided. The thyristors (204) and the busbars (205) are arranged alternately.

5. The submersible thyristor valve assembly structure according to claim 4, characterized in that, The RC absorption assembly (3) includes a lower fixed plate (301), a capacitor insulating mounting plate (302), a capacitor (303), a resistor insulating mounting plate (304), a resistor (305), and an upper fixed plate (306). The lower fixed plate (301) and the upper fixed plate (306) are connected through the capacitor insulating mounting plate (302) and the resistor insulating mounting plate (304). The capacitor (303) is disposed on the capacitor insulating mounting plate (302), and the resistor (305) is disposed on the resistor insulating mounting plate (304).

6. The submersible thyristor valve assembly structure according to claim 5, characterized in that, There is one capacitor insulating mounting plate (302) and two resistor insulating mounting plates (304). The capacitor insulating mounting plate (302) and the resistor insulating mounting plate (304) are arranged in parallel. Each capacitor insulating mounting plate (302) is provided with at least five capacitors (303) and each resistor insulating mounting plate (304) is provided with at least five resistors (305).

7. The submersible thyristor valve assembly structure according to claim 6, characterized in that, The lower fixing plate (301), the upper fixing plate (306), the valve group base (201), and the valve group pressure plate (208) are all provided with connection fixing holes (307).

8. The submersible thyristor valve assembly structure according to claim 1, characterized in that, The valve group oil tank (1) is provided with at least three of the single-phase thyristor valve groups (2) and at least three of the resistor-capacitor absorption components (3).

9. The submersible thyristor valve assembly structure according to claim 8, characterized in that, The valve group oil tank (1) is equipped with at least six inlet and outlet terminals (4).

10. The submersible thyristor valve assembly structure according to claim 1, characterized in that, The valve group oil tank (1) is provided with a valve group mounting seat (5) inside, which is used to install the single-phase thyristor valve group (2) and the resistor-capacitor absorption component (3).

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