Converter of offshore wind turbine generator and offshore wind turbine generator

Abstract

The embodiment of the invention provides a converter of an offshore wind turbine generator and the offshore wind turbine generator. The converter comprises a converter cabinet, a converter body, a functional composite layer, an electric appliance part and a sealing structure sleeve. The converter cabinet is provided with an accommodating cavity for accommodating the converter body; the functional composite layer comprises a functional layer, a ceramic material layer and an anti-corrosion coating, and the functional layer, the ceramic material layer and the anti-corrosion coating are sequentially arranged on the surfaces of the converter body and the converter cabinet from inside to outside; wherein the anticorrosive coating is a hydrophobic anticorrosive coating formed by compounding an epoxy shape memory polymer and a polycaprolactone nanofiber membrane and then spraying diatomite particles; the converter body and the electric appliance part are provided with a connecting section, and the sealing structure sleeve wraps the connecting section to prevent the connecting section from being directly exposed. Therefore, the converter provided by the embodiment of the invention has the advantages of good corrosion resistance and self-repairing capability.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a converter for an offshore wind turbine generator set and an offshore wind turbine generator set having the converter for the offshore wind turbine generator set. Background Art

[0002] The converters of offshore wind turbines are in a marine environment with high humidity and high salt fog for a long time. The converters face the following main problems in moisture and corrosion prevention: First, the harsh marine environment. High humidity and high salt fog make the marine atmosphere contain a large amount of water vapor and salt. The salt fog forms an electrolyte solution on the surface and inside of the converter, accelerating metal corrosion and causing component damage. Splashing waves and alternating dry and wet conditions destroy the protective layer, making it easier for moisture and salt to penetrate and cause corrosion. Organisms attach to the outer shell and heat dissipation device, and their metabolites and attachment behavior corrode the metal, affecting heat dissipation and normal operation. In addition, offshore wind turbines are far from the shore and the maintenance cost is relatively high.

[0003] In the related technology, the current moisture-proof and anti-corrosion measures mainly include coating the inverter casing with anti-corrosion paint and setting a desiccant box inside the inverter to absorb moisture. For the electrical connection part, sealant is used for sealing to prevent the intrusion of seawater and moisture, but there is a problem of poor anti-corrosion effect. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a converter for an offshore wind turbine. The converter has the advantages of good corrosion resistance and self-repairing ability.

[0005] The embodiment of the present invention further provides an offshore wind power offshore wind turbine unit.

[0006] The converter of the offshore wind turbine generator set according to the embodiment of the present invention comprises a converter cabinet, a converter body, a functional composite layer, electrical components and a sealing structure sleeve.

[0007] The converter cabinet has a accommodating cavity for placing the converter body; the functional composite layer includes a functional layer, a ceramic material layer and an anti-corrosion coating, and the functional layer, the ceramic material layer and the anti-corrosion coating are arranged on the surface of the converter body and the converter cabinet in sequence from the inside to the outside; wherein the anti-corrosion coating is a hydrophobic anti-corrosion coating formed by compounding an epoxy shape memory polymer and a polycaprolactone nanofiber membrane and then spraying diatomaceous earth particles; the converter body and the electrical component have a connecting section, and the sealing structure sleeve is coated on the outside of the connecting section to prevent the connecting section from being directly exposed to the outside.

[0008] The converter of the offshore wind turbine of the embodiment of the present invention is provided with a functional composite layer on the surface of the converter cabinet and the converter body, and the functional composite layer is divided into the functional layer, the ceramic material layer and the anti-corrosion coating, which are arranged in sequence from the inside to the outside, and the anti-corrosion coating is a hydrophobic anti-corrosion coating formed by compounding an epoxy shape memory polymer (SMP) and a polycaprolactone nanofiber membrane (PCL) and then spraying diatomaceous earth particles. The hydrophobic anti-corrosion coating obtained in this way has good flexibility and can be restored to its original state by heating and other methods after being damaged, and can achieve self-repairing function. As a result, the converter has the advantage of good anti-corrosion effect. There is no need to frequently replace the converter cabinet and the converter body. And then it helps to improve the overall life of the equipment. At the same time, compared with the traditional thick coating, the combination of nanofiber membrane and shape memory polymer can provide lighter but equally effective anti-corrosion protection, reducing the extra weight and material use.

[0009] In addition, diatomaceous earth particles are further sprayed on the composite film to form a super hydrophobic anti-corrosion coating. Since diatomaceous earth particles can continuously release corrosion inhibitors, the effective period of the anti-corrosion layer is further extended, and the maintenance frequency and cost are reduced. The formed layer has good stability, and the diatomaceous earth particles can promote the mechanical interlocking between the anti-corrosion layer and the substrate. Therefore, the converter has the effect of improving the interface adhesion.

[0010] Therefore, the converter of the offshore wind turbine generator system according to the embodiment of the present invention has the advantages of improved corrosion resistance and self-repair.

[0011] In some embodiments, the obtained hydrophobic anti-corrosion coating is heated at a temperature of 50°C-65°C for 1.5h-2.5h to obtain a repaired anti-corrosion coating.

[0012] In some embodiments, the anti-corrosion coating is first coated with an epoxy shape-memory polymer on a ceramic material layer, then combined with a polycaprolactone (PCL) nanofiber membrane to obtain a composite membrane with self-healing function, and then diatomaceous earth particles modified by octadecyltrimethoxysilane are sprayed onto the surface of the composite membrane to obtain the hydrophobic anti-corrosion coating, and finally heated at a temperature of 50°C-65°C for 1.5h-2.5h.

[0013] In some embodiments, the ceramic material layer is a nano-ceramic material layer.

[0014] In some embodiments, the functional layer is a composite of a hygroscopic material and a conductive material, the hygroscopic material is a carbon material layer, and the conductive material is a metal oxide layer.

[0015] In some embodiments, the sealing structure sleeve comprises a sleeve, and the outermost layer of the sleeve is neoprene.

[0016] In some embodiments, a hygroscopic material layer and a sealing rubber ring are provided inside the sleeve, and the sealing rubber ring and the hygroscopic material layer are arranged in the area near the end of the sealing structure sleeve, and the sealing rubber ring and the hygroscopic material layer are both spaced between the electrical components and the connecting section of the sealing structure sleeve, and the hygroscopic material layer is arranged inside the sealing structure sleeve relative to the sealing rubber ring.

[0017] In some embodiments, an air pressure regulating hole is provided on the converter cabinet, and an air pressure regulating component is provided in the air pressure regulating hole. The air pressure regulating component is arranged in the air pressure regulating hole to adjust the air pressure in the accommodating chamber, so that when the pressure inside and outside the accommodating chamber is inconsistent, the hot air flow in the accommodating chamber is discharged from the air pressure regulating component.

[0018] In some embodiments, the air pressure regulating hole is provided on the top plate of the converter cabinet, the air pressure regulating component is sealed in the air pressure regulating hole on the top plate, the air pressure regulating component includes a plug body and a waterproof breathable membrane, the plug body is embedded in the air pressure regulating hole, the plug body has an air hole, the central axis of the air pressure regulating hole coincides with the central axis of the air hole, the waterproof breathable membrane covers the air hole, and the waterproof breathable membrane is fixed in the air hole by melting.

[0019] In some embodiments, the bottom plate of the converter cabinet includes a rib plate body, reinforcing ribs and a skin, the reinforcing ribs include a plurality of longitudinal ribs and a plurality of transverse ribs, the plurality of longitudinal ribs and the plurality of transverse ribs are crisscrossedly arranged on one side of the rib plate body, and a recess is arranged on the other side of the rib plate body; the skin has an embedded portion, the skin is attached to the other side of the rib plate body, and the embedded portion is embedded in the recess.

[0020] An offshore wind turbine generator set according to an embodiment of the present invention comprises a converter for an offshore wind turbine generator set according to any one of the above descriptions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of a converter cabinet according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the structure of the functional composite layer of an embodiment of the present invention.

[0023] Figure 3 It is a three-dimensional diagram of the bottom plate of the converter cabinet according to an embodiment of the present invention.

[0024] Figure 4 4 is a cross-sectional view of a bottom plate of a converter cabinet according to an embodiment of the present invention.

[0025] Figure 5 It is a three-dimensional view of the top plate of the converter cabinet according to the embodiment of the present invention.

[0026] Figure 6 4 is a three-dimensional diagram of a gas pressure regulating member according to an embodiment of the present invention.

[0027] Figure 7 is a cross-sectional view of a gas pressure regulating member according to an embodiment of the present invention.

[0028] Figure 8 4 is a cross-sectional view of a sealing structure sleeve according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Converter cabinet 1;

[0031] Top plate 11; air pressure regulating hole 111; air pressure regulating member 112; plug body 1121; waterproof breathable membrane 1122;

[0032] Bottom plate 12; rib plate body 121; reinforcing rib 122; skin 123; recess 124; embedded portion 125;

[0033] Cabinet door 13; accommodating cavity 14;

[0034] Functional composite layer 2; functional layer 21; ceramic material layer 22; anti-corrosion coating 23;

[0035] Connecting segment 3;

[0036] Sealing structure sleeve 4; sleeve 41; hygroscopic material layer 42; sealing rubber ring 43. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] Reference below Figure 1-Figure 8 A converter for an offshore wind turbine generator set and an offshore wind turbine generator set according to an embodiment of the present invention are described.

[0039] The converter of the offshore wind turbine generator set according to the embodiment of the present invention comprises a converter cabinet 1 , a converter body (not shown in the figure), a functional composite layer 2 , electrical components (not shown in the figure) and a sealing structure sleeve 4 .

[0040] The converter cabinet 1 has a receiving cavity 14 for placing the converter body; the functional composite layer 2 includes a functional layer 21, a ceramic material layer 22 and an anti-corrosion coating 23, and the functional layer 21, the ceramic material layer 22 and the anti-corrosion coating 23 are sequentially arranged on the surface of the converter body and the converter cabinet 1 from the inside to the outside; wherein the anti-corrosion coating 23 is a hydrophobic anti-corrosion coating 23 formed by composite epoxy shape memory polymer and polycaprolactone nanofiber membrane and then sprayed with diatomaceous earth particles; the converter body and the electrical component have a connecting section 3, and the sealing structure sleeve 4 is coated outside the connecting section 3 to prevent the connecting section 3 from being directly exposed to the outside. A portion of the sealing structure sleeve 4 extends to a portion of each of the electrical component and the converter body.

[0041] The converter of the offshore wind turbine of the embodiment of the present invention is provided with a functional composite layer 2 on the surface of the converter cabinet 1 and the converter body, and the functional composite layer 2 is divided into a functional layer 21, a ceramic material layer 22 and an anti-corrosion coating 23 arranged in sequence from the inside to the outside, and the anti-corrosion coating 23 is a hydrophobic anti-corrosion coating 23 formed by compounding an epoxy shape memory polymer (SMP) and a polycaprolactone nanofiber membrane (PCL) and then spraying diatomaceous earth particles. The hydrophobic anti-corrosion coating 23 obtained in this way has good flexibility and can be restored to its original state by heating or the like after being damaged, and can realize a self-repairing function. As a result, the converter has the advantage of good anti-corrosion effect. There is no need to frequently replace the converter cabinet 1 and the converter body. This helps to improve the overall life of the equipment. At the same time, compared with traditional thick coatings, the combination of nanofiber membranes and shape memory polymers can provide lighter but equally effective anti-corrosion protection, reducing extra weight and material usage.

[0042] In addition, diatomaceous earth particles are further sprayed on the composite film to form a super hydrophobic anti-corrosion coating 23. Since the diatomaceous earth particles can continuously release corrosion inhibitors, the effective period of the anti-corrosion layer is further extended, the maintenance frequency and cost are reduced, and the formed layer has good stability. The diatomaceous earth particles can promote the mechanical interlocking between the anti-corrosion layer and the substrate. Therefore, the converter has the effect of improving the interface adhesion.

[0043] Therefore, the converter of the offshore wind turbine generator system according to the embodiment of the present invention has the advantages of good corrosion resistance and self-repairing ability.

[0044] The obtained hydrophobic anti-corrosion coating 23 is heated at a temperature of 50°C-65°C for 1.5h-2.5h to obtain a repaired anti-corrosion coating 23. It can overcome the fine lines or uneven areas generated during spraying, and then repair the spraying gaps that may exist due to process reasons. Thereby, it helps to further improve the service life of the converter. Not only that, during the use of the converter, some parts of the converter can be regularly heated and repaired to avoid the problem of seawater corroding the converter through the gaps. In addition, the service life of the converter of the offshore wind turbine is further improved.

[0045] Furthermore, the anti-corrosion coating 23 is firstly coated with epoxy-based shape-memory polymer on the ceramic material layer 22, then combined with polycaprolactone (PCL) nanofiber membrane to obtain a composite membrane with self-repairing function, and then diatomaceous earth particles modified by octadecyltrimethoxysilane are sprayed on the surface of the composite membrane to obtain a hydrophobic anti-corrosion coating 23, and finally heated at a temperature of 50°C-65°C for 1.5h-2.5h. .

[0046] The converter of the offshore wind turbine of the embodiment of the present invention uses diatomite particles modified by octadecyltrimethoxysilane to be sprayed on the surface of the composite membrane. The modified diatomite has higher hydrophobicity, which can prevent moisture from penetrating into the membrane and reduce the degradation of membrane performance caused by moisture. And the modified diatomite may show better thermal stability and chemical corrosion resistance. As a result, the converter has the ability to improve the self-repair of the hydrophobic anti-corrosion coating 23 in harsh application scenarios.

[0047] At the same time, the surface of the modified diatomite can form a cross-linked network, which increases the interaction between the filler and the polymer matrix, thereby improving the mechanical strength and toughness of the composite material.

[0048] Furthermore, the ceramic material layer 22 is a nano-ceramic material layer 22. Therefore, the nano-ceramic material layer 22 has high density and chemical stability, and can resist the corrosion of most acids, alkalis and salts. Furthermore, the nano-ceramic coating is often more durable than traditional coatings, can provide effective anti-corrosion protection for a long time, and reduces the cost of maintenance and replacement. At the same time, nano-ceramic materials usually show extremely high hardness and good wear resistance, which can effectively block the intrusion of moisture and salt. Therefore, the converter of the offshore wind turbine of the embodiment of the present invention has the advantage of further improving the anti-corrosion effect.

[0049] The functional layer 21 is a composite of a hygroscopic material and a conductive material, wherein the hygroscopic material is a carbon material layer and the conductive material is a metal oxide layer.

[0050] The carbon material layer in the converter of the offshore wind turbine of the embodiment of the present invention can form a thin protective film on the metal surface, enhance the bonding strength between the anti-corrosion layer and the substrate, ensure that the coating is more firmly attached to the metal surface, and is not prone to peeling or blistering. In addition, the hygroscopic material can also help maintain the integrity of the anti-corrosion coating 23, prevent expansion, contraction or other physical changes caused by moisture, and extend the overall service life of the coating.

[0051] The conductive material is a metal oxide layer, which can conduct away static electricity in time and prevent static electricity from absorbing salt, thereby helping to further improve the anti-corrosion effect.

[0052] The sealing structure sleeve 4 includes a sleeve 41, and the outermost layer of the sleeve 41 is chloroprene rubber. Because chloroprene rubber has good weather resistance, aging resistance, chemical corrosion resistance and elasticity. Its function is to serve as the first line of defense of the sealing sleeve to prevent the external seawater, salt spray, moisture, etc. from directly contacting the internal structure of the sealing sleeve. At the same time, its elasticity is used to ensure that the sealing sleeve can be closely attached to the electrical connection part under different working conditions (such as temperature changes, vibrations, etc.) to maintain good sealing performance.

[0053] A hygroscopic material layer 42 and a sealing rubber ring 43 are provided inside the sealing structure sleeve 4. The sealing rubber ring 43 and the hygroscopic material layer 42 are arranged in the area close to the end of the sealing structure sleeve 4. The sealing rubber ring 43 and the hygroscopic material layer 42 are both spaced between the electrical components of the sealing structure sleeve 4 and the connecting section 3, and the hygroscopic material layer 42 is arranged inside the sealing structure sleeve 4 close to the sealing rubber ring 43.

[0054] The converter of the offshore wind turbine generator set of the embodiment of the present invention can prevent water vapor and salt from entering between the sealing structure sleeve 4 and the connecting section 3 through the opening at the end of the sealing structure sleeve 4 by providing a hygroscopic material layer 42 and a sealing rubber ring 43 inside the sealing structure sleeve 4, thereby improving the corrosion resistance of the converter. Furthermore, the hygroscopic material layer 42 can have a strong adsorption selectivity and adsorption capacity for water molecules, further preventing the connecting section 3 from being corroded.

[0055] An air pressure regulating hole 111 is provided on the converter cabinet 1, and an air pressure regulating part 112 is provided in the air pressure regulating hole 111. The air pressure regulating part 112 is arranged in the air pressure regulating hole 111 to adjust the air pressure in the accommodating chamber 14, so that when the pressure inside and outside the accommodating chamber 14 is inconsistent, the hot air flow of the accommodating chamber 14 is discharged from the air pressure regulating part 112.

[0056] The converter of the offshore wind turbine generator set of the embodiment of the present invention can realize a heat balance structure that improves the safety factor of the converter and can solve the emergencies that occur when the product heats up too quickly. Furthermore, the converter has the advantages of good real-time performance and effectiveness, good water blocking effect and small size.

[0057] Furthermore, the converter cabinet 1 generally includes a door panel and a cabinet body, and the cabinet body and the cabinet door 13 are sealed together. For example, a plurality of sealing strips are provided on the periphery where the cabinet body and the cabinet door 13 are matched.

[0058] While achieving gas exchange, water molecules are blocked, which can not only adjust the air pressure of the accommodating chamber 14 to a balanced state in real time, but also avoid the increase of movement resistance caused by excessive pressure in the accommodating chamber 14 of the converter in the accommodating chamber 14.

[0059] The air pressure regulating component 112 is arranged on the top plate 11 of the converter cabinet 1, and an air pressure regulating hole 111 is arranged on the top plate 11. The air pressure regulating component 112 includes a plug body 1121 and a waterproof breathable membrane 1122. The plug body 1121 is embedded in the air pressure regulating hole 111, and the plug body 1121 has an air hole. The central axis of the air pressure regulating hole 111 coincides with the central axis of the air hole. The waterproof breathable membrane 1122 covers the air hole, and the waterproof breathable membrane 1122 is fixed in the air hole by melting.

[0060] The converter of the offshore wind turbine generator set of the embodiment of the present invention is provided with an air pressure regulating hole 111 on the top plate 11. As the hot air flows upward, the real-time and timely circulation is further guaranteed. In addition, compared with the use of a two-way or one-way valve for air pressure balance adjustment, the waterproof breathable membrane 1122 has the advantages of good real-time and effectiveness, good water blocking effect and small size.

[0061] Optionally, the vent hole is a trapezoidal hole, and the cross-sectional area of ​​the trapezoidal hole at one end close to the accommodating cavity 14 is larger than the cross-sectional area of ​​the end away from the accommodating cavity 14. The plug body 1121 is made of TPE material.

[0062] The bottom plate 12 of the converter cabinet 1 includes a rib plate body 121, reinforcing ribs 122 and a skin 123. The reinforcing ribs 122 include a plurality of longitudinal ribs and a plurality of transverse ribs. The plurality of longitudinal ribs and the plurality of transverse ribs are crisscrossedly arranged on one side of the rib plate body 121. A recess 124 is arranged on the other side of the rib plate body 121. The skin 123 has an embedded portion 125. The skin 123 is attached to the other side of the rib plate body 121, and the embedded portion 125 is embedded in the recess 124.

[0063] It should be noted that the functional composite layer 2 may not be provided on the lower surface of the bottom plate 12 of the converter cabinet 1 .

[0064] The converter of the offshore wind turbine of the embodiment of the present invention is provided with reinforcing ribs 122 through the rib plate body 121, and a plurality of transverse ribs are crisscrossed on one side of the rib plate body 121, which can help reduce the thickness of the entire bottom plate 12 while meeting the bearing capacity (such as bending moment, shear force) and ensuring structural stability and safety, thereby reducing the weight and construction cost of the bottom plate 12. At the same time, the embedded portion 125 can increase the contact area between the skin 123 and the rib plate body 121, thereby improving the firmness of the connection between the two. In addition, the provided skin 123 can withstand high corrosion and salt spray at sea, which helps to increase the service life of the bottom plate 12. Therefore, the converter of the offshore wind turbine of the embodiment of the present invention has the advantages of being light, reducing construction costs and having a long service life.

[0065] An offshore wind turbine according to an embodiment of the present invention includes any one of the above-mentioned converters.

[0066] Therefore, the offshore wind turbine generator system according to the embodiment of the present invention has the advantages of improved corrosion resistance and self-repair.

[0067] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection 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.

[0070] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0071] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0072] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A converter for an offshore wind turbine, characterized in that: include: A converter cabinet and a converter body, wherein the converter cabinet has a receiving cavity for placing the converter body; A functional composite layer, wherein the functional composite layer comprises a functional layer, a ceramic material layer and an anti-corrosion coating, wherein the functional layer, the ceramic material layer and the anti-corrosion coating are sequentially arranged on the surface of the converter body and the converter cabinet from the inside to the outside; Wherein, the anti-corrosion coating is a hydrophobic anti-corrosion coating formed by compounding an epoxy shape memory polymer and a polycaprolactone nanofiber membrane and then spraying diatomaceous earth particles; The electrical component and the sealing structure sleeve, the converter body and the electrical component have a connecting section, and the sealing structure sleeve is covered outside the connecting section to prevent the connecting section from being directly exposed to the outside.

2. The converter of the offshore wind turbine according to claim 1, characterized in that: The obtained hydrophobic anti-corrosion coating is heated at a temperature of 50° C. to 65° C. for 1.5 h to 2.5 h to obtain a repaired anti-corrosion coating.

3. The converter of the offshore wind turbine according to claim 2, characterized in that: The anti-corrosion coating is prepared by first coating an epoxy shape-memory polymer on a ceramic material layer, then combining it with a polycaprolactone (PCL) nanofiber membrane to obtain a composite membrane with self-repairing function, and then spraying diatomaceous earth particles modified by octadecyltrimethoxysilane onto the surface of the composite membrane to obtain the hydrophobic anti-corrosion coating, and finally heating it at a temperature of 50°C-65°C for 1.5h-2.5h.

4. The converter of the offshore wind turbine according to claim 1, characterized in that: The ceramic material layer is a nano ceramic material layer; And / or, the functional layer is a composite of a hygroscopic material and a conductive material, the hygroscopic material is a carbon material layer, and the conductive material is a metal oxide layer.

5. The converter of the offshore wind turbine according to claim 1, characterized in that: The sealing structure sleeve comprises a sleeve, and the outermost layer of the sleeve is chloroprene rubber.

6. The converter of the offshore wind turbine according to claim 5, characterized in that: A hygroscopic material layer and a sealing rubber ring are provided inside the sleeve, and the sealing rubber ring and the hygroscopic material layer are arranged in the area near the end of the sealing structure sleeve. The sealing rubber ring and the hygroscopic material layer are both spaced between the electrical components and the connecting section of the sealing structure sleeve, and the hygroscopic material layer is arranged inside the sealing structure sleeve relative to the sealing rubber ring.

7. The converter of the offshore wind turbine according to claim 1, characterized in that: The converter cabinet is provided with an air pressure regulating hole, in which an air pressure regulating component is provided. The air pressure regulating component is arranged in the air pressure regulating hole to regulate the air pressure in the accommodating chamber, so that when the pressure inside and outside the accommodating chamber is inconsistent, the hot air flow in the accommodating chamber is discharged from the air pressure regulating component.

8. The converter of the offshore wind turbine according to claim 7, characterized in that: The air pressure regulating hole is provided on the top plate of the converter cabinet, the air pressure regulating component is sealed in the air pressure regulating hole on the top plate, the air pressure regulating component includes a plug body and a waterproof breathable membrane, the plug body is embedded in the air pressure regulating hole, the plug body is provided with an air hole, the central axis of the air pressure regulating hole coincides with the central axis of the air hole, the waterproof breathable membrane covers the air hole, and the waterproof breathable membrane is fixed in the air hole by melting.

9. The converter of the offshore wind turbine according to claim 1, characterized in that: The bottom plate of the converter cabinet includes a rib plate body, reinforcing ribs and a skin, the reinforcing ribs include a plurality of longitudinal ribs and a plurality of transverse ribs, the plurality of longitudinal ribs and the plurality of transverse ribs are crisscrossedly arranged on one side of the rib plate body, and a recess is arranged on the other side of the rib plate body; the skin has an embedded portion, the skin is attached to the other side of the rib plate body, and the embedded portion is embedded in the recess.

10. An offshore wind turbine generator system, characterized in that: A converter comprising an offshore wind turbine according to any one of claims 1-9.

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