Immersed converter valve cooling system and method

Abstract

The invention discloses an immersed converter valve cooling system and method, the internal space of a cooling box body is divided into a main cavity and a pressure stabilizing cavity through a splitter plate, the splitter plate is provided with a plurality of splitter ports, the pressure stabilizing cavity is arranged at the bottom of the main cavity, the outside of the cooling box body is provided with an inlet, the inlet is connected with the pressure stabilizing cavity, and a converter valve is placed in the main cavity; an outlet is formed in the top of the main cavity; the bottom of the converter valve support is placed on the splitter plate, and the heating device is crimped with the radiator; the radiator comprises a substrate and a plurality of fins, the crimping surface of the substrate is crimped with the diode, the end surface of the substrate is provided with a plurality of through holes penetrating through the substrate, the arrangement direction of the plurality of fins is the same as the axis direction of the through holes and is vertical, and the plurality of fins are arranged on two side surfaces; the plurality of fins extend in a manner of being vertical to the substrate to form a comb-shaped structure; a cooling medium enters the pressure stabilizing cavity from the inlet and enters the main cavity through the flow dividing openings, heat exchange is conducted on the converter valve through the cooling medium to complete immersed cooling, and the cooling medium flows out from the outlet of the main cavity.

Description

Technical Field

[0001] This invention belongs to the field of converter valve cooling technology, specifically relating to an immersion converter valve cooling system and method. Background Technology

[0002] In the field of power transmission, high-voltage direct current (HVDC) transmission, with its unique advantages such as long transmission distance, low loss, and the ability to interconnect AC power grids of different frequencies, has become an indispensable and important component of modern power systems. As one of the core devices in HVDC transmission, the converter valve plays a crucial role in AC-DC conversion within the converter station, and its performance directly affects the stability and reliability of the entire HVDC transmission system.

[0003] Because converter valves need to handle enormous power during operation, their electronic components generate a significant amount of heat at high speeds. If this heat cannot be dissipated promptly and effectively, the internal temperature of the converter valve will rise sharply, affecting the performance and lifespan of the electronic components, and potentially causing equipment failure, resulting in severe economic losses and power outages. Therefore, equipping converter valves with efficient and reliable cooling systems to ensure their safe and stable operation in a suitable temperature environment is a crucial aspect of the design and operation of high-voltage direct current transmission systems.

[0004] Currently, conventional converter valve cooling primarily employs internal flow channel radiators. In this cooling scheme, the radiators are typically connected in parallel or series via pipes to achieve the circulation of the cooling medium and heat exchange. However, this design has several significant drawbacks. On one hand, the complex piping system not only occupies a large amount of space, making the converter station layout compact and difficult, but also increases construction costs. On the other hand, numerous pipe connection points require strict sealing measures to prevent cooling medium leakage. If the seal fails, cooling medium leakage will not only pollute the surrounding environment but may also lead to a decrease in the cooling effect of the converter valve, causing equipment overheating failures.

[0005] Especially for converter stations with special application scenarios, such as offshore converter stations, there are extremely high requirements for lightweight equipment design. Offshore converter stations are built in marine environments with extremely limited space resources, and also need to consider the equipment's corrosion resistance and wave resistance. Conventional cooling methods face significant challenges in offshore converter station applications due to complex piping and large footprint. Moreover, the harsh marine environment makes maintenance difficult and costly, and the complex piping system further increases the difficulty and risk of maintenance. Therefore, existing conventional converter valve cooling solutions are no longer sufficient to meet the urgent needs of offshore converter stations for lightweight, compact, and easy-to-maintain designs. There is an urgent need to design a new lightweight converter valve cooling solution to adapt to the new trends and requirements of modern power system development. Summary of the Invention

[0006] The purpose of this invention is to overcome the problem of insufficient portability in existing converter valve cooling methods, and to propose an immersion converter valve cooling system and method. Through the design of the converter valve cooling housing and radiator, the uniformity of cooling medium flow and the overall heat dissipation effect are improved, achieving a lightweight and simplified cooling system.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an immersion-type converter valve cooling system, including a cooling box and a converter valve. A flow divider is provided inside the cooling box, and the interior of the cooling box is filled with a cooling medium. The interior space of the cooling box is divided into a main chamber and a pressure stabilizing chamber by the flow divider. Several flow dividers are provided on the flow divider. The pressure stabilizing chamber is located at the bottom of the main chamber. An inlet is provided outside the cooling box and is connected to the pressure stabilizing chamber. The converter valve is placed in the main chamber, and an outlet is provided at the top of the main chamber. The converter valve consists of several sets of single valves. Each single valve includes a converter valve bracket, a capacitor, a resistor, a diode, and a heat sink. The capacitor, resistor, heating element, and heat sink are mounted on the converter valve bracket. The bottom of the converter valve bracket is placed on the flow divider plate, and the heating element and heat sink are pressed together. The heat sink includes a substrate and several fins. The pressing surface of the substrate is pressed against the diode. Several through holes are opened on the end face of the substrate. The through holes penetrate the substrate and the axis of the through holes is vertical. The fins are arranged in the same direction as the axis of the through holes. The fins are arranged on opposite sides of the substrate. The fins extend perpendicularly to the substrate to form a comb-like structure. The cooling medium enters the pressure stabilizing chamber through the inlet, passes through several branch ports between the pressure stabilizing chamber and the main chamber, and enters the main chamber. The cooling medium is used to perform heat exchange on the converter valve to complete the immersion cooling. The cooling medium flows out from the outlet of the main chamber.

[0008] Furthermore, a diffuser is installed between the inlet and the pressure stabilizing chamber.

[0009] Furthermore, a rectifier grid is installed between the voltage stabilizing chamber and the diffuser tube. The rectifier grid has several small holes, is semi-circular in shape, and has several layers.

[0010] Furthermore, a guide plate is installed in the pressure stabilizing chamber, and the guide plate is set at an angle to the bottom horizontal plane of the cooling box.

[0011] Furthermore, the flow dividers are evenly distributed below the converter valve, and the guide plate and the flow divider form a gradually narrowing flow channel, the range of which includes at least all the flow dividers.

[0012] Furthermore, at least one branch port is distributed between the two sets of single valves.

[0013] Furthermore, the cooling medium is mineral oil.

[0014] Furthermore, the outlets are located on the top side wall of the cooling box, and there are several outlets.

[0015] Furthermore, the heat-generating device is a diode, thyristor, or transistor.

[0016] Secondly, the present invention provides a method for operating an immersion converter valve cooling system, comprising the following steps: The cooling medium enters the pressure stabilizing chamber through the inlet, passes through several branch ports between the pressure stabilizing chamber and the main chamber, and then enters the main chamber. After the cooling medium exchanges heat with the converter valve in the main chamber, the cooling medium flows out from the outlet of the main chamber, completing the immersion cooling of the converter valve.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes an immersion-type converter valve cooling system that, while meeting the heat dissipation requirements of the converter valve, simplifies and lightweights the system, making it significant for applications requiring lightweight design, such as offshore converter stations. The converter valve is placed in the main cavity of the cooling tank, connected to the bottom pressure-stabilizing chamber via a branch port. The cooling medium, aided by the diffuser, rectifier grille, and guide plate, enters the main cavity evenly from the branch port, cooling each individual valve. The main heat-generating component, a diode, is press-fitted to the heat sink. Through-holes and fins on the substrate increase the surface area of ​​the heat sink, and its vertical arrangement enhances heat dissipation. The cooling medium is mineral oil, which has a higher insulation rating than air, allowing for a more compact arrangement of components. The immersion cooling method, compared to internal flow channel heat sinks, eliminates complex piping, simplifies the structure, eliminates leakage concerns, and offers higher reliability. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of the overall structure of an immersion converter valve cooling system.

[0019] Figure 2 This is a schematic diagram of the appearance of an immersion converter valve cooling system.

[0020] Figure 3 This is a schematic diagram of the internal structure at the entrance.

[0021] Figure 4 This is a schematic diagram of two sets of single valve structures.

[0022] Figure 5 This is a schematic diagram of a group of diodes being crimped to a heat sink.

[0023] Figure 6 This is a schematic diagram of the heat sink structure.

[0024] Among them, 1-cooling box; 11-inlet; 12-diffuser; 13-rectifier grille; 14-pressure stabilizing chamber; 15-guide plate; 16-split port; 17-main chamber; 18-outlet; 2-converter valve; 21-converter valve bracket; 22-capacitor; 23-resistor; 24-diode; 25-heat sink; 251-substrate; 252-through hole; 253-fin. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Example 1 See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 An immersion-type converter valve cooling system includes a cooling box 1 and a converter valve 2. The cooling box 1 has a flow divider plate inside and is filled with a cooling medium. The internal space of the cooling box 1 is divided into a main chamber 17 and a pressure regulating chamber 14 by the flow divider plate. The flow divider plate has several flow outlets 16. The pressure regulating chamber 14 is located at the bottom of the main chamber 17. An inlet 11 is located on the outside of the cooling box 1, connecting to the pressure regulating chamber 14. The converter valve 2 is placed in the main chamber 17, and an outlet 18 is located at the top of the main chamber 17. The converter valve 2 consists of several sets of single valves. Each single valve includes a converter valve bracket 21, a capacitor 22, a resistor 23, a diode 24, and a heat sink 25. The capacitor 22, resistor 23, heat-generating device 24, and heat sink 25 are mounted on the converter valve bracket 21, and the bottom of the converter valve bracket 21 is placed on the flow divider plate. On the board, the heating element 24 is pressed against the heat sink 25; the heat sink 25 includes a substrate 251 and several fins 253. The pressing surface of the substrate 251 is pressed against the diode 24. Several through holes 252 are opened on the end face of the substrate 251, and the through holes 252 penetrate the substrate 251. The axis of the through holes 252 is vertical. The arrangement direction of the several fins 253 is the same as the axis of the through holes 252. The several fins 253 are arranged on opposite sides of the substrate 251. The several fins 253 extend perpendicularly to the substrate 251 to form a comb-like structure. The cooling medium enters the voltage regulating chamber 14 through the inlet 11, and enters the main chamber 17 through several branch ports 16 between the voltage regulating chamber 14 and the main chamber 17. The cooling medium is used to perform heat exchange on the converter valve 2 to complete the immersion cooling. The cooling medium flows out from the outlet 18 of the main chamber 17.

[0030] In this embodiment, the cooling box 1 is divided into a main chamber 17 and a pressure-stabilizing chamber 14 by a flow divider. The cooling medium enters the main chamber 17 evenly from the pressure-stabilizing chamber 14 through the flow divider, which can completely surround the converter valve 2, ensuring uniform heat dissipation and preventing local overheating, thus effectively improving the overall cooling efficiency. The pressure-stabilizing chamber 14 is located at the bottom of the main chamber 17, and the converter valve 2 is placed in the main chamber. The inlet 11 is connected to the pressure-stabilizing chamber 14, and the outlet 18 is at the top of the main chamber 17. This compact layout makes full use of the internal space of the box, making the overall structure of the cooling system more reasonable and reducing space occupation. The radiator 25 in the converter valve 2 has a unique design. The base plate 251 has through holes 252, and the fins 253 are arranged in the same direction as the axis of the through holes 252 and are comb-shaped, extending perpendicular to the base plate 251. This structure increases the contact area between the cooling medium and the radiator 25, accelerates heat transfer, and can quickly remove the heat generated by the converter valve 2. The presence of the pressure stabilizing chamber 14 can stabilize the pressure and flow rate of the cooling medium, ensuring that the pressure and flow rate of the cooling medium entering the main chamber 17 are balanced, providing a stable cooling environment for the converter valve, which helps to improve the stability and reliability of the converter valve operation and extend its service life.

[0031] Example 2 A method for operating a submersible converter valve cooling system, using a submersible converter valve cooling system as described in Embodiment 1, includes the following steps: The cooling medium enters the pressure stabilizing chamber 14 through the inlet 11, and then enters the main chamber 17 through several branch ports 16 between the pressure stabilizing chamber 14 and the main chamber 17. After the cooling medium performs heat exchange on the converter valve 2 in the main chamber 17, the cooling medium flows out from the outlet 18 of the main chamber 17, completing the immersion cooling of the converter valve.

[0032] Example 3 An immersion-type converter valve cooling system mainly includes a cooling housing, which is divided into a main chamber and a pressure-stabilizing chamber. The pressure-stabilizing chamber is located at the bottom of the main chamber. The cooling medium enters from the inlet of the pressure-stabilizing chamber, passes through several branch outlets into the main chamber, and finally flows out from the outlet at the top of the main chamber. The converter valve is placed in the main chamber, and the main heat-generating components, diodes and heat sinks, are fixed by press-fitting.

[0033] The cooling box inlet is equipped with a diffuser and several layers of rectifier grilles, each layer of rectifier grilles having several small holes. The main cavity of the cooling box is connected to the pressure stabilizing cavity by several branch ports, which are evenly distributed below the converter valve assembly. The pressure stabilizing cavity of the cooling box is equipped with a guide plate, which forms a gradually narrowing flow channel with the top surface of the pressure stabilizing cavity at a certain angle to the horizontal plane. The range of the gradually narrowing flow channel includes at least all the branch ports.

[0034] The heat sink consists of a base plate and fins. The base plate has several through holes. The fins are located on the vertical surface of the base plate except for the pressing surface and are arranged vertically. The axis of the through holes is vertical.

[0035] like Figure 1-6 As shown, an immersion-type converter valve cooling system includes a cooling chamber and a converter valve. The converter valve is placed in the main cavity of the cooling chamber, which is filled with a cooling medium. The cooling medium flows in from the inlet, passes through a diffuser and a rectifier grille into the pressure regulating chamber, and, under the action of a guide plate, enters the main cavity through a branch port. After heat exchange with the converter valve in the main cavity, it flows out through the outlet. The converter valve consists of several individual valves, each composed of a converter valve support, capacitor, resistor, diode, heat sink, etc. The diode, as the main heat-generating device, is pressed against the heat sink. The heat sink consists of a substrate and fins, with through holes on the substrate.

[0036] The cooling medium is mineral oil, which not only achieves the cooling function but also enhances the insulation level of the converter valve, making the converter valve structure more compact.

[0037] The main heat-generating device in this embodiment is a diode, but in practice it can also be a thyristor, transistor, etc., without affecting the function of the cooling system.

[0038] The cooling medium inlet is located at the bottom of the cooling chamber, and the outlet is located at the top. When the cooling medium is heated, its density decreases, and it flows upwards due to the density difference, allowing it to be discharged promptly from the top outlet, thus ensuring that the temperature inside the cooling chamber does not become too high. In this embodiment, the outlet is designed as two circular holes on the top side wall; other shapes or numbers would not affect the functionality.

[0039] Figure 1 This is a schematic diagram of the overall structure of an immersion converter valve cooling system. Figure 2 See the schematic diagram of the submersible converter valve cooling system. Figure 1 and Figure 2 The converter valve consists of several individual valves placed inside the cooling chamber and completely submerged in the cooling medium. The cooling medium enters from the bottom inlet and exits from the top outlet. Each set of individual valves has the same heat dissipation capacity, therefore the uniformity of the cooling medium flow determines the overall cooling effect. The cooling chamber is divided into a main chamber and a pressure-stabilizing chamber. The cooling medium first enters the pressure-stabilizing chamber, and then enters the main chamber through the branch outlets. Each branch outlet corresponds to two sets of individual valves, ensuring that cooling medium flows near each individual valve, thereby guaranteeing a uniform cooling effect.

[0040] In this embodiment, the converter valve consists of 12 sets of single valves, corresponding to 6 flow dividers. The flow dividers are square in shape. In practical applications, the number of single valves and the shape of the flow dividers can be changed.

[0041] Figure 3 See the schematic diagram of the internal structure of the entrance. Figure 3The inlet is equipped with a diffuser and a rectifier grille. After passing through the diffuser, the flow velocity of the cooling medium decreases. Then, under the action of the rectifier grille, the flow range expands to the entire pressure-stabilizing chamber, and then flows evenly to the branch ports. Because the heat dissipation of the converter valve is large and the flow velocity of the cooling medium at the inlet is fast, if the cooling medium is directly introduced into the pressure-stabilizing chamber, it will cause uneven distribution of the total pressure in the pressure-stabilizing chamber, which in turn will lead to uneven flow from each branch port into the main chamber, affecting the overall heat dissipation effect.

[0042] The diffuser's cross-sectional shape transitions from circular to square at the inlet. The flow-rectifying grille has two layers, both semi-circular in shape, with evenly distributed circular perforations. The first layer of the grille expands the flow direction of the cooling medium to 180°, and the second layer further expands the flow range of the cooling medium to the entire vertical cross-section of the pressure-stabilizing chamber. After passing through the two layers of grilles, the cooling medium flows evenly towards the branch outlet. In practical applications, the cross-sectional shape of the diffuser, the radius and number of layers of the flow-rectifying grille, and the shape and number of perforations can all be varied.

[0043] See Figure 1 A guide vane is installed in the pressure stabilizing chamber, forming a gradually narrowing flow channel with the top surface of the chamber at a certain angle to the horizontal plane. After the cooling medium flows out from the rectifier grille at the inlet, it gradually flows out from each branch port, with decreasing flow rate and velocity. According to Bernoulli's principle, a decrease in velocity leads to an increase in pressure, which can cause uneven flow at each branch port and affect heat dissipation. The gradually narrowing flow channel formed by the guide vane keeps the flow velocity of the cooling medium essentially constant, ensuring that the flow rate into the main chamber from each branch port remains consistent, thus guaranteeing that each individual valve of the converter valve is effectively cooled.

[0044] Figure 4 These are schematic diagrams of two sets of single-valve structures. Figure 5 This is a schematic diagram of a diode being crimped to a heatsink. Figure 6 This is a schematic diagram of the heat sink structure. See also... Figure 4 A single-unit converter valve mainly consists of a converter valve support, several capacitors, resistors, diodes, and a heat sink. Devices with relatively low heat generation, such as resistors, are immersed in the cooling medium, and their temperature requirements are met by heat dissipation from their own outer surface. Diodes generate more heat, and their heat dissipation surfaces are pressed together with the heat sink's substrate for cooling. The heat sink consists of a substrate and fins. The substrate has through-holes; both the fins and the through-holes increase the surface area of ​​the heat sink, enhancing heat dissipation. The fins are distributed on two vertical surfaces of the substrate, excluding the pressing surface, and are vertically oriented. The through-holes are located on the horizontal surface of the substrate, with their axial direction vertical. When the cooling medium in the fin gaps and through-holes is heated, its density decreases, and it flows upwards due to the density difference. The vertical design of the through-holes and fins reduces the flow resistance of the high-temperature cooling medium, allowing the low-temperature cooling medium to be replenished in a timely manner, thus enhancing the heat dissipation effect.

[0045] Specifically, the heat sink has four through holes on its base plate and five fins on each side. In practice, the base plate size, the shape and number of through holes, and the size and number of fins can all be changed.

[0046] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0047] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the present invention.

Claims

1. A submersible converter valve cooling system, characterized in that, The cooling box (1) includes a cooling box (1) and a flow-changing valve (2). The cooling box (1) is equipped with a flow-dividing plate inside. The cooling box (1) is filled with a cooling medium. The internal space of the cooling box (1) is divided into a main cavity (17) and a pressure-stabilizing cavity (14) by the flow-dividing plate. The flow-dividing plate is provided with several flow-dividing ports (16). The pressure-stabilizing cavity (14) is located at the bottom of the main cavity (17). The cooling box (1) is provided with an inlet (11) on the outside. The inlet (11) is connected to the pressure-stabilizing cavity (14). The flow-changing valve (2) is placed in the main cavity (17). The main cavity (17) is provided with an outlet (18) at the top. The converter valve (2) consists of several sets of single valves. Each single valve includes a converter valve bracket (21), a capacitor (22), a resistor (23), a diode (24), and a heat sink (25). The capacitor (22), resistor (23), heating element (24), and heat sink (25) are mounted on the converter valve bracket (21). The bottom of the converter valve bracket (21) is placed on the flow divider plate. The heating element (24) and the heat sink (25) are pressed together. The heat sink (25) includes a substrate (251) and a plurality of fins (253). The pressing surface of the substrate (251) is pressed against the diode (24). A plurality of through holes (252) are formed on the end face of the substrate (251). The plurality of through holes (252) penetrate the substrate (251). The axis of the through holes (252) is vertical. The plurality of fins (253) are arranged in the same direction as the axis of the through holes (252). The plurality of fins (253) are arranged on opposite sides of the substrate (251). The plurality of fins (253) extend perpendicularly to the substrate (251) to form a comb-like structure. The cooling medium enters the pressure stabilizing chamber (14) through the inlet (11), and enters the main chamber (17) through several branch ports (16) between the pressure stabilizing chamber (14) and the main chamber (17). The cooling medium is used to perform heat exchange on the converter valve (2) to complete the immersion cooling. The cooling medium flows out from the outlet (18) of the main chamber (17).

2. The immersion converter valve cooling system according to claim 1, characterized in that, A diffuser tube (12) is provided between the inlet (11) and the pressure stabilizing chamber (14).

3. The immersion converter valve cooling system according to claim 2, characterized in that, A rectifier grid (13) is provided between the stabilizing chamber (14) and the diffuser (12). The rectifier grid (13) has several small holes and is semi-circular in shape. The rectifier grid (13) has several layers.

4. The immersion converter valve cooling system according to claim 1, characterized in that, A guide plate (15) is provided in the pressure stabilizing chamber (14), and the guide plate (15) is set at an angle to the bottom horizontal plane of the cooling box (1).

5. The immersion converter valve cooling system according to claim 4, characterized in that, The flow dividers (16) are evenly distributed below the flow exchange valve (2), and the guide plate (15) and the flow divider form a gradually narrowing channel. The range of the gradually narrowing channel includes at least all the flow dividers (16).

6. The immersion converter valve cooling system according to claim 5, characterized in that, At least one branch port is distributed between the two sets of single valves (16).

7. The immersion converter valve cooling system according to claim 1, characterized in that, The cooling medium is mineral oil.

8. The immersion converter valve cooling system according to claim 1, characterized in that, The outlet (18) is located on the top side wall of the cooling box (1), and there are several outlets (18).

9. The immersion converter valve cooling system according to claim 1, characterized in that, The heat-generating device is a diode, thyristor, or transistor.

10. A method for operating an immersion converter valve cooling system, characterized in that, Using a submersible converter valve cooling system according to any one of claims 1-9 includes the following steps: The cooling medium enters the pressure stabilizing chamber (14) through the inlet (11), and enters the main chamber (17) through several branch ports (16) between the pressure stabilizing chamber (14) and the main chamber (17). After the cooling medium performs heat exchange on the converter valve (2) in the main chamber (17), the cooling medium flows out from the outlet (18) of the main chamber (17), completing the immersion cooling of the converter valve.

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