20kv forced air-cooled high speed solid state switching power device based on crimped thyristor

Abstract

The utility model relates to a 20kV forced air -cooled high -speed solid -state switch power device based on crimping type thyristor, including cabinet, vertical valve group unit, independent air duct unit, three vertical valve group units are arranged along the horizontal direction parallel in the cabinet, and the independent air duct unit is installed between every vertical valve group unit and the cabinet, the independent air duct unit includes independent air duct, centrifugal fan, and the top of independent air duct is communicated with centrifugal fan, and the bottom is connected with vertical valve group unit. Advantages are: cabinet design is adopted, guarantee to deal with dust pollution, electromagnetic shielding optimization, easy to transport and so on difficult problem. The utility model is through "vertical layout + vertical independent air duct" design, shortens the air duct, solves the problem of climbing distance, guarantees that the equipment size is compact, the whole cabinet mechanical strength is stable, improves equipment maintenance efficiency, solves high voltage grade and cabinet volume contradiction, adapts to narrow space arrangement.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to a 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor. Background Technology

[0002] The press-fit thyristor forced air-cooled high-speed solid-state switch is a core power electronic device based on contactless switching technology. Through the rapid switching capabilities of the thyristor, it can precisely control the switching of 20kV high-voltage circuits, effectively suppressing the rate of increase of fault current and preventing damage to load equipment due to overcurrent or arcing, thus significantly improving system safety. Compared to traditional mechanical switches, its contactless characteristics support high-frequency operation and are easily integrated with remote communication and intelligent control modules, making it widely used in flexible DC transmission, high-power pulse power supplies, and new energy grid connection.

[0003] Despite the significant advantages of solid-state switch technology, existing forced-air-cooled solid-state switches face severe technical bottlenecks as voltage levels increase to 20kV and operating conditions become more complex. To address challenges such as dust pollution, electromagnetic shielding optimization, and ease of transportation, forced-air-cooled solid-state switches typically employ a cabinet design. Currently, valve units based on press-fit thyristors are mostly arranged in a horizontal layout (e.g., patent publication number CN204131134U, which discloses a horizontal direct-connected thyristor valve unit; patent publication number CN102290402A, which discloses a horizontal light-controlled water-cooled thyristor valve unit). Considering minimizing the cabinet's footprint, if a horizontal layout is used, the three-phase valve units inside the solid-state switch cabinet can only be arranged from top to bottom, requiring a vertical series air duct design. However, when the system voltage is 20kV, the creepage distance between phases needs to be increased to approximately 480mm. To meet this requirement, the vertical height of the cabinet must be significantly increased, resulting in an excessively long longitudinal path for the air ducts. This increased heat dissipation path necessitates a substantial increase in the airflow of the top-mounted fans to maintain cooling efficiency, leading to a surge in energy consumption and noise. Furthermore, the significantly increased cabinet height reduces its mechanical performance. Additionally, the three-phase series air duct runs through the entire cabinet, requiring the disassembly of all air duct components to replace a single-phase valve assembly, reducing equipment maintenance efficiency. Current technologies often mitigate these problems by sacrificing compactness or over-sizing the cooling capacity, but this increases equipment layout costs and reduces environmental adaptability. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a 20kV forced air-cooled high-speed solid-state switch power device based on a press-fit thyristor. It adopts a cabinet structure design, and the three-phase valve group unit inside the cabinet adopts a vertical layout from left to right with a vertical independent air duct design, which effectively solves the problems of air duct length and creepage distance of 20kV solid-state switch equipment, reduces the cabinet height, ensures the compact structure of the equipment, and improves heat dissipation efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor includes a cabinet, vertical valve group units, and independent air duct units. Three vertical valve group units are arranged side by side in the horizontal direction inside the cabinet, and an independent air duct unit is installed between each vertical valve group unit and the cabinet. The independent air duct unit includes an independent air duct and a centrifugal fan. The top of the independent air duct is connected to the centrifugal fan, and the bottom is connected to the vertical valve group unit.

[0007] The cabinet door is equipped with an air inlet.

[0008] The cabinet is equipped with an insulator support plate, input / output row insulators, and valve group unit support beams. The insulator support plate is connected to the rear of the cabinet. The input / output row insulators are fixedly connected to the insulator support plate and are used to support the input / output rows. The input / output rows are connected to the vertical valve group unit. The valve group unit support beams are fixedly connected to the bottom of the cabinet.

[0009] The cabinet has an air duct opening and mounting holes at the top, and side beams are fixedly connected to both sides. The side beams are used to install reinforcing beam insulators to improve the structural rigidity between valve groups.

[0010] The vertical valve group unit includes a valve group frame, a thyristor unit, a resistor-capacitor absorption unit, a control unit, a valve group air duct mounting support frame, and a valve group air duct side plate; the valve group air duct side plate is fixedly connected to the resistor-capacitor absorption unit to form the valve group internal cavity, the valve group internal cavity is connected to the valve group frame, and the thyristor unit and control unit are connected to the outer wall of the valve group internal cavity; the valve group air duct mounting support frame is connected to the top of the valve group frame.

[0011] The thyristor unit includes a solid heat sink and a horizontal airflow channel. The solid heat sink is connected to the horizontal airflow channel, and the horizontal airflow channel is connected to the interior of the valve assembly's internal cavity.

[0012] An external heat dissipation cavity is formed between the internal cavity of the valve assembly and the cabinet.

[0013] The bottom of the vertical valve assembly unit is connected to the cabinet via a valve assembly support insulator.

[0014] The centrifugal fan is fixed to the top of the cabinet.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) This utility model adopts a cabinet design to ensure that it can cope with difficult problems such as dust pollution, electromagnetic shielding optimization and easy transportation.

[0017] 2) This utility model shortens the air duct and solves the creepage distance problem through the "vertical layout + vertical independent air duct" design, ensuring that the equipment size is compact, the mechanical strength of the whole cabinet is stable, the equipment maintenance efficiency is improved, the contradiction between high voltage level and cabinet volume is resolved, and it is suitable for narrow space layout.

[0018] 3) By constructing a horizontal-vertical composite heat dissipation path of "air inlet → external heat dissipation cavity → horizontal airflow channel → valve group internal cavity → independent air duct → centrifugal fan", the heat dissipation efficiency and reliability are effectively improved, ensuring long-term stable operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of this utility model that removes the front door of the cabinet.

[0021] Figure 3 This is a schematic diagram of the structure of this utility model for removing the back door of the cabinet.

[0022] Figure 4 This is a structural diagram of the cabinet without the front door.

[0023] Figure 5 This is a schematic diagram of the vertical valve assembly unit. Figure 1 .

[0024] Figure 6 This is a schematic diagram of the vertical valve assembly unit. Figure 2 .

[0025] Figure 7 This is the front view of the vertical valve assembly unit.

[0026] Figure 8 yes Figure 7 A sectional view along line AA.

[0027] Figure 9 yes Figure 8 Enlarged view of part I.

[0028] Figure 10 This is a structural diagram of an independent air duct unit.

[0029] Figure 11 yes Figure 9 Sectional view along line BB.

[0030] Figure 12 This is a schematic diagram of a forced air cooling route.

[0031] In the diagram: 1. Cabinet; 2. Vertical valve unit; 3. Independent air duct unit; 4. Forced air cooling system; 101. Air inlet; 102. Insulator support plate; 103. Valve unit support beam; 104. Cabinet top plate; 105. Cabinet side beam; 106. Input / output row insulators; 107. Input / output row; 108. Reinforcing beam insulator; 201. Valve frame; 202. Thyristor unit; 202a. Solid diffuser Heater; 202b, Horizontal airflow channel; 203, Resistance-capacitance absorption unit; 204, Control unit; 205, Valve group support insulator; 206, Valve group air duct mounting support frame; 207, Valve group air duct side plate; 208, Valve group internal cavity; 301, Independent air duct; 302, Centrifugal fan; 303, Cabinet air duct mounting support frame; 304, Fan bracket; 401, External heat dissipation cavity; 402, Internal heat dissipation cavity. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0033] This embodiment proposes a 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor, such as... Figure 1 , Figure 2 As shown, the system includes a cabinet 1, vertical valve assembly units 2, and independent air duct units 3. Inside the cabinet 1, three vertical valve assembly units 2 are arranged horizontally from left to right. Each vertical valve assembly unit 2 is connected to the cabinet 1 by an independent air duct unit 3. Each independent air duct unit 3 includes an independent air duct 301 and a centrifugal fan 302. The top of the independent air duct 301 connects to the centrifugal fan 302, and the bottom connects to the vertical valve assembly units 2. The cabinet 1 provides mechanical support, heat dissipation cavity construction, electrical safety, and environmental adaptability for the solid-state switching power device, ensuring its efficient operation in complex industrial environments while maintaining compactness, reliability, and economy. The vertical valve assembly units 2, as the core component of the solid-state switching power device, effectively suppress the fault current rise rate, preventing damage to the load equipment due to overcurrent, and construct an internal heat dissipation cavity 402 through internal structural design. The independent air duct units 3, as part of the air duct system, complete the internal heat dissipation cavity 402, ensuring heat dissipation efficiency and guaranteeing the efficient operation of the solid-state switching power device.

[0034] like Figures 1-4As shown, the cabinet 1 is constructed from cold-rolled steel sheet, bent and welded, with a powder-coated surface. Cabinet 1 includes an air inlet 101, an insulator support plate 102, a valve group unit support beam 103, a top plate 104, side beams 105, and other sheet metal components providing support. The air inlet 101 is located on the cabinet door and is equipped with a removable air filter, providing a cooling air inlet 101 for the solid-state switching power device and ensuring efficient heat dissipation within the cabinet. An insulator support plate 102 is installed at the rear of cabinet 1, with input / output bar insulators 106 mounted on it to support input / output bars 107, which are connected to the vertical valve group units 2. A valve group unit support beam 103 is located at the bottom of cabinet 1 to support three vertical valve group units 2. Cabinet body 1 has side beams 105 installed on both sides. Reinforcing beam insulators 108 are installed between the side beams 105 and the vertical valve group units 2. The reinforcing beam insulators 108 can enhance the mechanical strength of cabinet body 1 and valve group, and also ensure the electrical clearance and creepage distance requirements between the three vertical valve group units 2. The cabinet top plate 104 at the top of cabinet body 1 has reserved mounting holes and air duct openings. The cabinet top plate 104 is divided into an inner top plate side and an outer top plate side. The inner top plate side has reserved mounting holes for supporting the independent air duct unit 3, and the outer top plate side has reserved mounting holes for installing the centrifugal fan 302.

[0035] like Figures 5-9 As shown, the vertical valve group unit 2 includes a valve group frame 201, a thyristor unit 202, a resistor-capacitor (RC) absorption unit 203, a control unit 204, a valve group support insulator 205, a valve group air duct mounting support frame 206, and a valve group air duct side plate 207. The valve group frame 201 provides structural support and mechanical strength for the entire vertical valve group unit 2. The thyristor unit 202, as the core part of the entire unit, provides the core current control capability for the entire vertical valve group unit 2. The RC absorption unit 203 and the control unit 204 are the core protective barriers for the high-voltage solid-state switch, ensuring the reliable operation of the thyristor unit 202. The valve group support insulator 205 is installed below the valve group frame 201 at the bottom of the unit to support the entire vertical valve group unit 2. During valve group installation, the valve group support insulator 205 is connected to the valve group unit support beam 103 at the bottom of the cabinet 1 for quick installation. The valve group air duct mounting support frame 206 is installed above the valve group frame 201 at the top of the unit to support the independent air duct unit 3. The resistor-capacitor absorption unit 203 and the air duct side plate together form the valve group internal cavity 208, and the bottom of the valve group internal cavity 208 is sealed by the base plate. At the same time, the resistor and capacitor on the resistor-capacitor absorption unit 203 are also built into the valve group internal cavity 208 for heat dissipation.

[0036] The valve assembly internal cavity 208 is connected to the valve assembly frame 201, and the thyristor unit 202 and control unit 204 are connected to the outer wall of the valve assembly internal cavity 208. The valve assembly internal cavity 208 is connected to the independent air duct 301. The thyristor unit 202 includes a press-fit thyristor, a solid heat sink 202a, and a horizontal airflow channel 202b. The press-fit thyristors are stacked together and cooled by the solid heat sink 202a. The thyristor unit 202 is vertically fixed to the outside of the valve assembly internal cavity 208. The outside of the solid heat sink 202a is connected to the horizontal airflow channel 202b, which is connected to the inside of the valve assembly internal cavity 208. The side plate 207 of the valve assembly air duct, which contacts the solid heat sink 202a, has openings in the solid heat sink 202a to ensure that air enters the valve assembly internal cavity 208. Airflow enters the valve assembly's internal cavity 208 through the horizontal airflow channel 202b of the solid radiator 202a, ensuring the airflow channel and making the valve assembly's internal cavity 208 a complete structure. Figure 8 In the sectional view, the arrows indicate the direction of airflow.

[0037] like Figures 10-11 As shown, the independent air duct unit 3 includes an independent air duct 301 and a centrifugal fan 302. The independent air duct 301 is composed of four resin boards spliced ​​together, forming the main structure of the vertical air duct. The centrifugal fan 302 provides the negative pressure driving force required for air circulation in the entire air duct (from the internal cavity 208 of the valve group through the independent air duct 301 to the outside of the cabinet), and is the core power source of the forced air cooling system 4. The lower inlet of the independent air duct 301 is connected to the valve group air duct mounting support frame 206, and the upper outlet is fixed to the cabinet air duct mounting support frame 303 by bolts. The cabinet air duct mounting support frame 303 is connected to the pre-drilled mounting holes on the top plate 104 of the cabinet. The valve group air duct mounting support frame 206 and the cabinet air duct mounting support frame 303 are fixed with bolts to ensure easy disassembly. The centrifugal fan 302 is fixed to the fan bracket 304 on the top plate 104 of the cabinet, adjacent to the upper outlet of the independent air duct 301. By bolting and fixing the independent air duct unit 3 to the vertical valve group unit 2 and the cabinet 1, a complete and efficient heat dissipation air duct is constructed, which starts from the internal cavity 208 of the valve group, rises vertically through the independent air duct 301, and is finally discharged outside the cabinet by the centrifugal fan 302.

[0038] like Figure 12As shown, the forced air cooling system 4 includes an external heat dissipation cavity 401 and an internal heat dissipation cavity 402. The external heat dissipation cavity 401 is composed of the inner wall of the cabinet 1 and the outer surfaces of three vertical valve assembly units 2. The internal heat dissipation cavity 402 is a continuous, vertically upward heat dissipation airflow channel space formed by the connection of the valve assembly internal cavity 208 and the independent air duct 301, and the forced air cooling is powered by the centrifugal fan 302 on each independent air duct unit 3. Through the construction of the forced air cooling system 4, external air enters the external heat dissipation cavity 401 through the air inlet 101 of the cabinet 1. The air flows horizontally through the horizontal airflow channel 202b, and after entering the valve assembly internal cavity 208, the airflow changes from horizontal to vertical. In the internal heat dissipation cavity 402 (flowing vertically upward through the independent air duct 301), it is forcefully drawn out of the cabinet by the centrifugal fan 302, thus completing the cooling. Ultimately, three independent horizontal-vertical composite heat dissipation paths are formed, from the air inlet 101 of cabinet 1 → external heat dissipation cavity 401 → horizontal airflow channel 202b → valve group internal cavity 208 → independent air duct unit 3 → centrifugal fan 302, which effectively improves heat dissipation efficiency and reliability and ensures long-term stable operation.

[0039] The above embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor, characterized in that, It includes a cabinet, a vertical valve assembly unit, and an independent air duct unit; three vertical valve assembly units are arranged side by side in the horizontal direction inside the cabinet, and an independent air duct unit is installed between each vertical valve assembly unit and the cabinet; the independent air duct unit includes an independent air duct and a centrifugal fan, with the top of the independent air duct connected to the centrifugal fan and the bottom connected to the vertical valve assembly unit.

2. The 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The cabinet door is equipped with an air inlet.

3. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The cabinet is equipped with an insulator support plate, input / output row insulators, and valve group unit support beams. The insulator support plate is connected to the rear of the cabinet, and the input / output row insulators are fixedly connected to the insulator support plate to support the input / output rows. The valve group unit support beams are fixedly connected to the bottom of the cabinet.

4. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The top of the cabinet is equipped with an air duct and mounting holes, and the two sides are fixedly connected with cabinet side beams.

5. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The vertical valve group unit includes a valve group frame, a thyristor unit, a resistor-capacitor absorption unit, a control unit, a valve group air duct mounting support frame, and a valve group air duct side plate; the valve group air duct side plate is fixedly connected to the resistor-capacitor absorption unit to form the valve group internal cavity, the valve group internal cavity is connected to the valve group frame, and the thyristor unit and control unit are connected to the outer wall of the valve group internal cavity; the valve group internal cavity is connected to an independent air duct; the valve group air duct mounting support frame is connected to the top of the valve group frame.

6. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 5, characterized in that, The thyristor unit includes a solid heat sink and a horizontal airflow channel. The solid heat sink is connected to the horizontal airflow channel, and the horizontal airflow channel is connected to the interior of the valve assembly's internal cavity.

7. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 5, characterized in that, An external heat dissipation cavity is formed between the internal cavity of the valve assembly and the cabinet.

8. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The bottom of the vertical valve assembly unit is connected to the cabinet via a valve assembly support insulator.

9. A 20kV forced air-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The centrifugal fan is fixed to the top of the cabinet.

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