Boost isolation transformer for offshore wind turbine generator

Abstract

The utility model provides a boost isolation transformer for an offshore wind turbine generator. The boost isolation transformer comprises a transformer body; the transformer body is coated with the shell; the shell comprises a side plate; heat dissipation frames are arranged on the three adjacent side plates; transversely arranged heat dissipation blades are arranged on the heat dissipation frame; a driving assembly arranged at the top of the heat dissipation frame is connected with the heat dissipation blades and a control device of the driving assembly; the control device comprises a supporting column penetrating through the x-direction center line of the cooling blade; the traction cables are connected with the clamping parts and are separately arranged on the two sides of the supporting column, and the baffles are arranged on the bottom surfaces of the heat dissipation blades and are connected with the traction cables. The heat dissipation frame is arranged on the transformer shell, collaborative optimization of efficient heat dissipation and protection functions is achieved through the design of the modular driving structure and the adjustable heat dissipation blades, and the problem that in the prior art, heat dissipation and rain prevention of an offshore transformer shell are difficult to achieve at the same time is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of offshore transformers, and more particularly to a step-up isolation transformer for offshore wind turbines. Background Technology

[0002] Offshore step-up isolation transformers are electrical equipment designed specifically for marine environments. They are mainly used in offshore wind power, oil and gas platforms, and ships. Their core function is to step up the low voltage output from generators or power sources to a high voltage suitable for long-distance transmission or grid connection (such as stepping up from 690V to 33kV or higher). At the same time, by isolating the primary and secondary windings, they can block grounding loop current, suppress harmonic interference, and improve system safety.

[0003] These types of transformers require the use of high-strength anti-corrosion materials (such as epoxy resin coating and stainless steel shell) to resist the corrosion of salt spray, moisture and extreme temperature differences. At the same time, a corrosion-resistant shell is added to the transformer to prevent rainwater from directly contacting the transformer body, and forced air cooling is provided to ensure long-term stable operation.

[0004] In existing technologies, the design of protective enclosures for offshore step-up isolation transformers faces multiple environmental adaptability challenges: on the one hand, a complete waterproof barrier needs to be constructed to resist the salt spray corrosion and rainwater penetration unique to the marine environment, which requires reducing the area of ​​heat dissipation holes to prevent rainwater from falling directly onto the transformer body through the heat dissipation holes; on the other hand, sufficient heat exchange efficiency must be ensured to cope with the continuous exposure environment of tropical seas with temperatures as high as 55°C, which requires increasing the area of ​​heat dissipation holes while equipping them with forced air cooling equipment to improve heat dissipation efficiency.

[0005] However, in actual use, the lifespan of air-cooled equipment is far shorter than that of the transformer itself. At the same time, due to environmental factors, these transformers are difficult to maintain. When the air-cooled equipment is damaged, the transformer, limited by the small heat dissipation hole area, will fail due to excessive temperature rise. Utility Model Content

[0006] The purpose of this invention is to solve the problem in the prior art that the outer casing of offshore transformers is difficult to balance heat dissipation and rain protection.

[0007] To achieve the above objectives, this application proposes a step-up isolation transformer for offshore wind turbines, comprising: a transformer body; a housing covering the transformer body, the housing including: side plates covering the four sides of the transformer body; heat dissipation frames formed on three adjacent side plates; heat dissipation blades arranged horizontally on the heat dissipation frames; a drive assembly disposed on the top of the heat dissipation frames, the drive assembly including: a housing; a dual-shaft motor disposed inside the housing; a drive shaft connected to the output shaft of the dual-shaft motor via a coupling; a winch disposed on the drive shaft; a circumferential array of locking portions distributed on the surface of the winch; and a control device connecting the heat dissipation blades and the drive assembly; the control device including: a support column passing through the centerline of the heat dissipation blades in the x-direction; traction cables connecting the locking portions and disposed on both sides of the support column; and a baffle disposed on the bottom surface of the heat dissipation blades and connected to the traction cables.

[0008] This application incorporates a heat dissipation frame on the transformer casing. Through a modular drive structure and adjustable heat dissipation blades, it achieves synergistic optimization of efficient heat dissipation and protection functions. The opening and closing degree of the heat dissipation blades on the heat dissipation frame is controlled by a drive assembly and a control unit. When it rains, the opening degree of the heat dissipation blades can be reduced to decrease the heat dissipation area, preventing rainwater from directly passing through the casing and falling onto the transformer body, causing corrosion. When it is not raining, the opening degree of the heat dissipation blades can be increased to enhance the transformer's heat dissipation capacity. This solves the problem in the prior art that the casing of offshore transformers is difficult to balance heat dissipation and rain protection.

[0009] Furthermore, in order to secure the traction cable with a snap-fit ​​mechanism and enhance the mechanical properties of the snap-fit ​​portion, the snap-fit ​​portion includes: two symmetrically arranged clamping blocks; and a snap-fit ​​groove disposed between the two clamping blocks.

[0010] Furthermore, in order to facilitate the installation of the traction cable in the locking part on the winch, the direction of the locking groove is always perpendicular to the radial direction of the winch.

[0011] Furthermore, in order to reduce the friction between the traction cable and the heat dissipation blades, the traction cable includes: a traction rope body that is snapped into the snap-fit ​​groove of the snap-fit ​​part and extends through the bottom of the outer shell at both ends; and rigid connecting sleeves sleeved at both ends of the traction rope body, wherein the ends of the rigid connecting sleeves are hinged to double-pivot control rods, and the double-pivot control rods are positioned at a 120° angle along the y-axis on both sides of the support column.

[0012] Furthermore, in order to adjust the tilt angle of the heat dissipation blades by driving the baffle through the dual-pivot control rod, the baffle is connected to the dual-pivot control rod and fits against the bottom surface of the heat dissipation blades.

[0013] Furthermore, in order to reduce the space occupied by the traction cable during installation, a rectangular guide window is provided at the bottom of the outer casing, through which the traction cable passes.

[0014] Furthermore, in order to achieve load distribution and rotational degree of freedom compensation through the combination design of rolling bearings and limiting grooves, a double-row tapered roller bearing is rotatably provided at the end of the rigid connecting sleeve. The outer ring of the double-row tapered roller bearing is provided with an annular limiting groove, and the traction rope is embedded in the annular limiting groove to form circumferential constraint.

[0015] Furthermore, to enhance the stability of the heat dissipation blade installation, the sidewall of the heat dissipation blade is connected to the sidewall of the heat dissipation frame by fasteners.

[0016] The beneficial effects of this application are as follows:

[0017] 1. This application provides a heat dissipation frame on the transformer casing. Through a modular drive structure and adjustable heat dissipation blades, it achieves synergistic optimization of efficient heat dissipation and protection functions. The opening and closing degree of the heat dissipation blades on the heat dissipation frame is controlled by the drive assembly and control unit. When it rains, the opening degree of the heat dissipation blades can be reduced to reduce the heat dissipation area and prevent rainwater from directly passing through the casing and falling on the transformer body, causing corrosion of the transformer body. When it is not raining, the opening degree of the heat dissipation blades can be increased to enhance the heat dissipation capacity of the transformer. This solves the problem in the prior art that it is difficult for the casing of marine transformers to simultaneously achieve heat dissipation and rain protection.

[0018] 2. The drive unit of this application is enclosed by a housing, which can prevent rainwater from corroding the drive unit during offshore operations. At the same time, the rectangular guide window at the bottom of the housing can drain the liquid accumulated in the housing. Meanwhile, the traction rope passes through the rectangular guide window, so that the winch, the locking part and the traction cable are enclosed by the housing, further preventing rainwater erosion.

[0019] 3. In the control device of this application, the traction cable includes a traction rope body, a rigid connecting sleeve, and a double-pivot control rod. The rigid connecting sleeve is hinged to the traction rope body, so that the double-pivot control rod is kept in a vertical position, reducing the friction between the double-pivot control rod and the heat dissipation fins, and reducing the wear of the double-pivot control rod. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the structure of a step-up isolation transformer for offshore wind turbines in an embodiment of this application;

[0022] Figure 2 This is a cross-sectional view of a step-up isolation transformer for offshore wind turbines in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the drive assembly, heat sink, and control device in the embodiments of this application;

[0024] Figure 4 for Figure 3 Enlarged view of point a in the middle;

[0025] Figure 5 for Figure 3 Enlarged view at point b;

[0026] Figure 6 This is a schematic diagram of the installation of the baffle in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Transformer body;

[0029] 2. Housing; 21. Side panel; 22. Heat sink frame; 23. Heat sink blades;

[0030] 3. Drive assembly; 31. Housing; 311. Rectangular guide window; 32. Dual-axis motor; 33. Drive shaft; 34. Winch; 35. Snap-fit ​​part; 351. Clamping block; 352. Snap-fit ​​groove;

[0031] 4. Control device; 41. Support column; 42. Traction cable; 421. Traction rope body; 422. Rigid connecting sleeve; 4221. Double row tapered roller bearing; 4222. Annular limiting groove; 423. Double fulcrum control rod; 43. Baffle. Detailed Implementation

[0032] The following will be combined with the appendix Figures 1-6 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0033] This embodiment achieves dynamic adjustment of the opening and closing degree of the heat dissipation blades through the coordinated action of the drive component and the control device. For example... Figure 1-3As shown, this application provides a housing 2 on the transformer body 1, wherein heat dissipation frames 22 are provided on three adjacent side plates 21. The heat dissipation blades 23 arranged laterally on the heat dissipation frames 22 are connected to the centerline in the x-direction through the support column 41 to form a rotation axis, and their bottom surfaces are attached to the baffle 43. The dual-axis motor 32 of the drive assembly 3 drives the transmission shaft 33 to rotate through the coupling, thereby driving the winch 34 to rotate synchronously. The snap-fit ​​parts 35 distributed in a circular array on the surface of the winch 34 are snapped with the end of the traction rope 421 of the traction cable 42 through snap-fit ​​grooves 352. When the winch 34 rotates, the traction cables 42 on both sides of the support column 41 generate differential traction force.

[0034] like Figure 4 As shown, the traction rope 421 transmits the tension to the dual-pivot control rod 423 through the rigid connecting sleeve 422. This control rod is positioned at a 120° angle on both sides of the support column 41. Its end hinge structure converts linear motion into rotational motion around the support column 41, driving the baffle 43 to push the heat dissipation blades 23 to rotate around the x-axis, achieving continuous adjustment of the opening angle within the range of 0° to 60°. This structure converts the motor's rotational motion into blade angle changes through a mechanical transmission chain. Under rainless conditions, the blades maintain the maximum opening angle (60°) to enhance convective heat dissipation. During rainfall, the opening is reduced to below 30° to form a guiding slope, preventing rainwater from vertically penetrating the heat dissipation frame 22.

[0035] To cope with the high salt spray environment of the ocean, drive component 3 adopts a semi-enclosed protective design. For example... Figure 3 , Figure 5 As shown, the outer casing 31 encloses the dual-axis motor 32, drive shaft 33, and winch 34, with a rectangular guide window 311 at its bottom for the traction rope 421 to pass through. The rectangular guide window 311 has a chamfered edge to allow condensate trapped at the bottom of the casing to drain out along the rectangular guide window 311, preventing liquid accumulation from corroding internal components.

[0036] In a preferred embodiment, the bottom of the outer casing 31 is set as a slope to accelerate the flow of accumulated liquid from the rectangular guide window 311.

[0037] The clamping part 35 uses a clamping block 351 fixed with bolts to constrain the end of the traction rope 421 into the clamping groove 352. The groove is perpendicular to the radial direction of the winch 34, ensuring that the traction force is always applied in the tangential direction and avoiding radial deviation of the rope.

[0038] To reduce mechanical losses during transmission, the traction cable 42 employs a multi-stage friction-reducing design. For example... Figure 4 , Figure 6As shown, a double-row tapered roller bearing 4221 is embedded at the end of the rigid connecting sleeve 422, and the annular limiting groove 4222 on its outer ring forms a circumferential constraint with the traction rope 421. When the dual-pivot control rod 423 swings under the action of the baffle 43, the inner ring of the bearing rotates with the control rod, and the outer ring remains relatively stationary with the rope through the limiting groove 4222, thus converting sliding friction into rolling friction.

[0039] To enhance the wind load resistance of the heat dissipation blades 23, their sidewalls are rigidly connected to the sidewalls of the heat dissipation frame 22 using M6 stainless steel bolts. For example... Figure 2 As shown, each heat dissipation blade 23 is configured with 4 sets of connection points, which are evenly distributed along the blade height direction.

[0040] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set," "equipped with," "connected," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A step-up isolation transformer for offshore wind turbine units, characterized in that, include: Transformer body (1); The housing (2) covering the transformer body (1) includes: side plates (21) covering the transformer body (1) around its perimeter; heat dissipation frames (22) are provided on three adjacent side plates (21); and heat dissipation blades (23) are arranged horizontally on the heat dissipation frames (22). The drive assembly (3) is located on top of the heat sink (22). The drive assembly (3) includes: a housing (31); a dual-axis motor (32) located inside the housing (31); a transmission shaft (33) connected to the output shaft of the dual-axis motor (32) via a coupling; a winch (34) located on the transmission shaft (33); and snap-fit ​​parts (35) are distributed in a circumferential array on the surface of the winch (34). A control device (4) connecting the heat dissipation blade (23) and the drive assembly (3); the control device (4) includes: a support column (41) passing through the center line of the heat dissipation blade (23) in the x direction; a traction cable (42) connecting the snap-fit ​​part (35) and standing on both sides of the support column (41); and a baffle (43) disposed on the bottom surface of the heat dissipation blade (23) and connected to the traction cable (42).

2. The step-up isolation transformer for offshore wind turbines according to claim 1, characterized in that, The snap-fit ​​part (35) includes: two clamping blocks (351) arranged symmetrically; and a snap-fit ​​groove (352) disposed between the two clamping blocks (351).

3. The step-up isolation transformer for offshore wind turbines according to claim 2, characterized in that, The direction of the snap-fit ​​groove (352) is always perpendicular to the radial direction of the winch (34).

4. The step-up isolation transformer for offshore wind turbines according to claim 1, characterized in that, The traction cable (42) includes: a traction rope body (421) that is snapped into the snap groove (352) of the snap part (35) and extends through the bottom of the outer shell (31) at both ends; and a rigid connecting sleeve (422) sleeved at both ends of the traction rope body (421), wherein a double-pivot control rod (423) is hinged at the end of the rigid connecting sleeve (422), and the double-pivot control rod (423) is positioned at a 120° angle along the y-axis on both sides of the support column (41).

5. The step-up isolation transformer for offshore wind turbines according to claim 4, characterized in that, The baffle (43) is connected to the dual-pivot control rod (423) and fits against the bottom surface of the heat dissipation blade (23).

6. The step-up isolation transformer for offshore wind turbines according to claim 4, characterized in that, The bottom of the outer shell (31) is provided with a rectangular guide window (311), and the traction rope (421) passes through the rectangular guide window (311).

7. The step-up isolation transformer for offshore wind turbines according to claim 4, characterized in that, The end of the rigid connecting sleeve (422) is rotatably provided with a double-row tapered roller bearing (4221), and the outer ring of the double-row tapered roller bearing (4221) is provided with an annular limiting groove (4222). The traction rope (421) is embedded in the annular limiting groove (4222) to form a circumferential constraint.

8. The step-up isolation transformer for offshore wind turbines according to claim 1, characterized in that, The sidewall of the heat dissipation blade (23) is connected to the sidewall of the heat dissipation frame (22) by fasteners.

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