Immersed flow control valve device

Abstract

The present invention relates to the technical field of converter valves, and discloses an immersed converter valve device, including a shell, a terminal block, and a converter valve assembly, wherein the converter valve assembly is installed in the internal cavity of the shell, the cavity is filled with insulating liquid, so that the converter valve assembly is immersed in the insulating liquid, the terminal block is electrically connected to the converter valve assembly, and the terminal block is arranged on the outside of the shell. The converter valve assembly is immersed in the insulating liquid, and during the operation of the converter valve device, the insulating liquid is used to directly take away the heat generated by the converter valve assembly, and the external equipment is connected through the terminal block. The insulating performance of the insulating liquid is better than that of air, and the insulation requirements can be achieved with a smaller distance. The shell also protects the converter valve assembly, and there is no need to build a valve hall, saving a lot of installation space.

Description

Technical Field

[0001] The present invention relates to the technical field of flow converter valves, and in particular to an immersed flow converter valve device. Background Art

[0002] Power electronic equipment such as DC converter valves have the characteristics of high voltage level and large power loss, and have high requirements for heat dissipation. Deionized water is usually used for cooling inside the valve. A typical converter valve water cooling system requires a cooling water flow of about 200m 3 / h, water cooling system pressure is about 0.8Mpa, the number of joints is about 30,000, there are about 33 types of sensors, about 130 locations, about 280, and the electrical length of deionized water is about 25 meters. In addition, the water cooling system has the disadvantages of poor insulation of cooling water, low heat exchange efficiency, complex system, and high difficulty in operation and maintenance. In actual operation, about 45% of the faults are caused by the water cooling system. The large number of joints, overly complex pipelines, high system operating pressure, long-term uninterrupted operation, and complex monitoring and protection systems, these factors have led to low reliability of the water cooling system. At the same time, the complex system also brings a lot of operation and maintenance work, and there is a disadvantage of high difficulty in later maintenance. In addition, the existing converter valve uses air medium for insulation, and the insulation strength of air is low, and a larger insulation distance is required, which makes the converter valve occupy a large installation space and cannot be directly installed outdoors. It is necessary to build a valve hall and various facilities to meet the working requirements of the converter valve. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to achieve a better cooling effect of the converter valve.

[0004] In order to solve the above technical problems, the present invention provides an immersed converter valve device, including a shell, a terminal and a converter valve assembly, wherein the converter valve assembly is installed in the internal cavity of the shell, the cavity is filled with insulating liquid so that the converter valve assembly is immersed in the insulating liquid, the terminal is electrically connected to the converter valve assembly, and the terminal is arranged on the outside of the shell.

[0005] As a preferred solution, the converter valve assembly is suspended from the top plate of the shell.

[0006] As a preferred embodiment, the converter valve assembly includes a fixing frame and a plurality of single valves mounted on the fixing frame, the fixing frame is suspended on the top plate of the shell through an insulator, the single valves are arranged in parallel on the fixing frame along the vertical direction, and the single valves are electrically connected to each other.

[0007] As a preferred embodiment, the single valve includes multiple thyristors, multiple heat sinks and clamps, and the thyristors and heat sinks are arranged alternately and abutting each other. The clamps are arranged at both ends of the thyristors and the heat sinks along the arrangement direction to press the thyristors and the heat sinks.

[0008] As a preferred embodiment, the heat sink is provided with a first abutting surface abutting against the thyristor, and the thyristor is provided with a second abutting surface abutting against the heat sink, the first abutting surface and the second abutting surface are arranged opposite to each other, and the area of ​​the first abutting surface is larger than the area of ​​the second abutting surface.

[0009] As a preferred solution, it also includes a cooling device arranged on the shell, and the insulating liquid is a low-boiling point insulating medium.

[0010] As a preferred embodiment, the cooling device includes a condenser, a first pipe and a second pipe, one end of the first pipe is connected to the inlet of the condenser, the other end of the first pipe is connected to the top plate of the shell, one end of the second pipe is connected to the outlet of the condenser, and the other end of the second pipe is connected to the side plate of the shell.

[0011] As a preferred solution, the insulating liquid is a fluorinated liquid.

[0012] As a preferred solution, the connection terminals include a high-voltage AC terminal, a low-voltage DC terminal and a high-voltage DC terminal, and the high-voltage AC terminal, the low-voltage DC terminal and the high-voltage DC terminal are sequentially arranged on the side plate of the shell.

[0013] As a preferred solution, the shell is made of metal, and a gap is provided around the shell and around the converter valve assembly.

[0014] Compared with the prior art, the submerged flow control valve device provided by the present invention has the following beneficial effects:

[0015] The present invention installs the converter valve assembly in the cavity of the shell and immerses it in the insulating liquid, which is in direct contact with the converter valve assembly and has very low thermal resistance. During the operation of the converter valve device, the insulating liquid is used to directly take away the heat generated by the converter valve assembly, and the external equipment is connected through the wiring terminal. The insulating performance of the insulating liquid is better than that of air, and the insulation requirements can be achieved with a smaller distance. The shell also protects the converter valve assembly, and there is no need to build a valve hall, which saves a lot of installation space, and can be directly set outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an immersed flow control valve device according to a preferred embodiment of the present invention.

[0017] Figure 2 It is a structural schematic diagram of a single valve in an immersed flow control valve device according to a preferred embodiment of the present invention.

[0018] In the figure: 1. Shell; 2. Fixing frame; 3. Single valve; 31. Thyristor; 32. Radiator; 33. Clamp; 4. Condenser; 5. First pipeline; 6. Second pipeline; 7. High-voltage AC terminal; 8. Low-voltage DC terminal; 9. High-voltage DC terminal. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 to Figure 2 As shown, a preferred embodiment of the present invention provides an immersed converter valve device, including a shell 1, a wiring terminal and a converter valve assembly, wherein the converter valve assembly is installed in an internal cavity of the shell 1, and the cavity is filled with insulating liquid so that the converter valve assembly is immersed in the insulating liquid, and the wiring terminal is electrically connected to the converter valve assembly, and the wiring terminal is arranged on the outside of the shell 1.

[0023] In the immersed converter valve device based on the above technical features, the converter valve assembly is installed in the cavity of the shell 1 and immersed in the insulating liquid, which is in direct contact with the insulating liquid and has very small thermal resistance. During the operation of the converter valve device, the insulating liquid is used to directly take away the heat generated by the converter valve assembly, and the external equipment is connected through the terminal. The insulating performance of the insulating liquid is better than that of air, and the insulation requirements can be achieved with a smaller distance. The shell 1 also protects the converter valve assembly, and there is no need to build a valve hall, which saves a lot of installation space, and can be directly set outdoors.

[0024] In this embodiment, the converter valve assembly is suspended on the top plate of the housing 1 through an insulator to avoid direct contact between the converter valve assembly and the housing 1, thereby ensuring electromagnetic shielding.

[0025] In this embodiment, the converter valve assembly includes a fixing frame 2 and a plurality of single valves 3 mounted on the fixing frame 2. The fixing frame 2 is suspended on the top plate of the housing 1 through an insulator. The single valves 3 are arranged in parallel on the fixing frame 2 along the vertical direction. The single valves 3 are electrically connected to each other. The single valves 3 are installed and fixed through the fixing frame 2, which is stable and reliable. Lightning arresters are also provided between some of the single valves 3.

[0026] Specific, combined Figure 2 As shown, the single valve 3 includes a plurality of thyristors 31, a plurality of heat sinks 32 and a clamp 33. The thyristors 31 and the heat sinks 32 are arranged alternately in abutment with each other. The clamp 33 is arranged at both ends of the thyristors 31 and the heat sink 32 along the arrangement direction, and is used to press the thyristors 31 and the heat sink 32. The heat sink 32 and the thyristors 31 are alternately connected to the wall, and the close wall-adhering manner facilitates the conduction of heat. Finally, they are pressed together by the clamp 33. The redundancy of the thyristors 31 is set to be relatively large, which can ensure that they can continue to operate normally when several devices fail, and can be maintained once every many years.

[0027] Furthermore, the heat sink 32 is provided with a first abutting surface abutting against the thyristor 31, and the thyristor 31 is provided with a second abutting surface abutting against the heat sink 32. The first abutting surface and the second abutting surface are arranged opposite to each other, and the area of ​​the first abutting surface is larger than the area of ​​the second abutting surface, so that the heat sink 32 can quickly take away the heat generated by the thyristor 31. The heat sink 32 is a cavity structure without an inlet and outlet and a flow channel, and is immersed in the insulating liquid. The thyristor 31 and the heat sink 32 are connected together in a wall-attached manner, and the heat of the thyristor 31 is conducted to the heat sink 32, and the insulating liquid absorbs and takes away the heat. The interior of the heat sink 32 is roughened, and the contact area with the insulating liquid is large, which accelerates the cooling effect.

[0028] In this embodiment, a cooling device is further included on the shell 1. The insulating liquid is a low-boiling-point insulating medium. The insulating liquid is used to absorb and take away the heat generated in the thyristor 31, and the temperature is raised to the boiling point and boiled into gas. The cooling device is then used to condense the gas into liquid and flow it back into the shell 1, forming a cooling cycle.

[0029] Specifically, the cooling device includes a condenser 4, a first pipe 5 and a second pipe 6, one end of the first pipe 5 is connected to the inlet of the condenser 4, the other end of the first pipe 5 is connected to the top plate of the shell 1, one end of the second pipe 6 is connected to the outlet of the condenser 4, and the other end of the second pipe 6 is connected to the side plate of the shell 1. When the insulating liquid boils into gas, it rises and enters the first pipe 5, condenses into liquid through the condenser 4, and returns to the converter valve through the second pipe 6 under the action of gravity, which greatly improves the cooling effect of the insulating liquid. Wherein, the insulating liquid is a fluorinated liquid, which has the characteristics of low boiling point, large latent heat of phase change, etc., absorbs a large amount of heat through phase change, and forms fluoride gas.

[0030] Taking advantage of the low boiling point and high latent heat of phase change of the fluorinated liquid, the heat is absorbed in the radiator 32, boiled into gas, and the gas rises into the external cooling condenser 4, condensed into low-temperature liquid, and flows back to the shell 1 under the action of gravity, thus realizing the cooling cycle. Since there are no pipelines and interfaces, the structure of the converter valve is simplified, there is no vibration problem, and the reliability is greatly improved. The thyristor 31 is directly immersed in the fluorinated liquid, and the generated heat can be directly cooled without going through a complex conduction process, which has a higher efficiency than the deionized water cooling system. The fluorinated liquid has good insulation properties and can meet the insulation requirements at a smaller distance. In addition, the fluorinated liquid will phase change into gas after absorbing heat. According to standards such as IEC-60247, the insulation properties of the fluoride in the liquid state and the gas-liquid mixed state are tested. The fluoride after the phase change can still meet the insulation requirements, and there will be no insulation defects and reliability problems.

[0031] Since the converter valve assembly is immersed in fluoride liquid, fluoride has excellent insulation properties, and the distance between the converter valves is much smaller than that of existing converter valves, the overall size of the converter valve device can be made very small, achieving a smaller footprint. During the operation of the converter valve, if an accident occurs or maintenance is required, the converter valve of the same model can be used to replace it, and off-site maintenance and repair can be carried out, which greatly reduces the accident time and improves power supply reliability. Since fluoride is used as an insulating medium, there is no need to build a valve hall and it can be installed outdoors. Fluoride is also non-flammable and has good fire resistance.

[0032] In this embodiment, the connection terminal includes a high-voltage AC terminal 7, a low-voltage DC terminal 8, and a high-voltage DC terminal 9, and the high-voltage AC terminal 7, the low-voltage DC terminal 8, and the high-voltage DC terminal 9 are sequentially arranged on the side plate of the housing 1. The high-voltage AC terminal 7, the low-voltage DC terminal 8, and the high-voltage DC terminal 9 are electrically connected to an external circuit.

[0033] In this embodiment, the housing 1 is made of metal, and a gap is provided around the converter valve assembly and the housing 1. The housing 1 is grounded at the zero point, and there may be insulation problems compared to the high potential that may be generated at the high point of the converter valve, so a certain distance should be maintained between the converter valve assembly and the housing 1 to avoid insulation problems.

[0034] In summary, the embodiment of the present invention provides an immersion type converter valve device to realize the fully immersed installation mode of the converter valve assembly, which meets the insulation, cooling, reliability, fireproof performance and other requirements of the converter valve, simplifies the structure of the converter valve, and realizes the requirement that the converter valve can be installed outdoors. During the operation of a high-power converter valve, it is necessary not only to meet the insulation, cooling and other requirements of the converter valve, but also to meet the requirements of the insulation and cooling of the converter valve. The structure without pump and pipeline interface realizes a high-reliability installation scheme of the converter valve. The phase change heat dissipation method does not require a lot of pipes and interfaces, reduces the vibration and leakage risks of the system, and greatly improves the reliability of the converter valve system. The submerged converter valve uses a high-insulation, low-boiling point compound as a medium. The low-boiling point liquid medium absorbs heat through the gasification process after being heated, and has high heat exchange efficiency. The use of such a medium can simultaneously meet the insulation and heat dissipation requirements of the converter valve. At the same time, the submerged structure system has low pressure, does not have a large number of joint structures, has a simple monitoring and protection system, and has a short electrical distance. It has two advantages: (1) The system is simple, highly reliable, and basically maintenance-free; (2) It is small in size, saves space, and can be arranged outdoors, saving the cost and time of building a valve hall.

[0035] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An immersed flow control valve device, characterized in that: The invention comprises a shell, a wiring terminal and a converter valve assembly, wherein the converter valve assembly is installed in an internal cavity of the shell, the cavity is filled with insulating liquid so that the converter valve assembly is immersed in the insulating liquid, the wiring terminal is electrically connected to the converter valve assembly, and the wiring terminal is arranged on the outside of the shell.

2. The submerged flow control valve device according to claim 1, characterized in that: The converter valve assembly is suspended on the top plate of the shell.

3. The submerged flow control valve device according to claim 2, characterized in that: The converter valve assembly includes a fixing frame and a plurality of single valves mounted on the fixing frame. The fixing frame is suspended on the top plate of the shell through an insulator. The single valves are arranged in parallel on the fixing frame along the vertical direction, and the single valves are electrically connected to each other.

4. The submerged flow control valve device according to claim 3, characterized in that: The single valve includes a plurality of thyristors, a plurality of heat sinks and a clamp, wherein the thyristors and the heat sinks are arranged alternately and abutting each other, and the clamp is arranged at both ends of the thyristors and the heat sinks along the arrangement direction, and is used to press the thyristors and the heat sinks.

5. The submerged flow control valve device according to claim 4, characterized in that: The heat sink is provided with a first abutting surface abutting against the thyristor, and the thyristor is provided with a second abutting surface abutting against the heat sink. The first abutting surface and the second abutting surface are arranged opposite to each other, and the area of ​​the first abutting surface is larger than that of the second abutting surface.

6. The submerged flow control valve device according to claim 1, characterized in that: It also includes a cooling device arranged on the shell, and the insulating liquid is a fluorinated liquid.

7. The submerged flow control valve device according to claim 6, characterized in that: The cooling device includes a condenser, a first pipe and a second pipe, one end of the first pipe is connected to the inlet of the condenser, the other end of the first pipe is connected to the top plate of the shell, one end of the second pipe is connected to the outlet of the condenser, and the other end of the second pipe is connected to the side plate of the shell.

8. The submerged flow control valve device according to any one of claims 1 to 7, characterized in that: The connection terminals include a high-voltage AC terminal, a low-voltage DC terminal and a high-voltage DC terminal, and the high-voltage AC terminal, the low-voltage DC terminal and the high-voltage DC terminal are sequentially arranged on the side plate of the shell.

9. The submerged flow control valve device according to any one of claims 1 to 7, characterized in that: The shell is made of metal material, and a gap is arranged around the shell and around the converter valve assembly.

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