A sealing structure for a box transformer upper moving cabin

Abstract

The application relates to the sealing technical field of wind power generation equipment, and particularly discloses a sealing structure for a box transformer upper moving machine cabin, which comprises a sealing strip and a joint assembly, the sealing strip is internally provided with a hollow cavity, the inner side is fixedly sleeved with a first base strip and a second base strip, and both ends are provided with buckling seats; the joint assembly comprises a fixed shaft seat, a movable shaft cover, a fixed pin buckle and a rotating pin buckle, a sealing slip ring, a spring and a sliding pin are arranged between the movable shaft cover and the fixed shaft seat, and are used for realizing lifting locking and flexible buffering; the rotating pin buckle can be rotated by 90 degrees and connected with the box transformer; the structure is closed and compact, and the sealing is reliable; the sealing function and the connecting structure are highly integrated in the application structure; the application has good elastic adaptability, dynamic compensation capacity and rapid assembly performance, and is particularly suitable for high-altitude butt joint sealing scenes between a wind power machine cabin and a box transformer.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for wind power generation equipment, specifically a sealing structure for a transformer substation with an upward-moving nacelle. Background Technology

[0002] As an important form of renewable energy utilization, wind power generation has seen its installed capacity continuously increase, and the development of wind turbine generator sets (hereinafter referred to as wind turbines) has entered the megawatt-level and even ten-megawatt-level era. Under the background of high power output, the size and power consumption of various electrical equipment inside the wind turbine have increased significantly. In particular, the layout and installation of transformers have a significant impact on the overall structural design, power transmission efficiency, and maintenance convenience.

[0003] Traditional wind turbines typically place the box-type transformer (hereinafter referred to as box transformer) on an independent platform on the base of the tower or outside the tower. Although this structure is convenient for installation and maintenance, it has the following drawbacks: on the one hand, the generator and the box transformer need to be connected by a long-distance cable, which can easily cause line loss; on the other hand, the independently set box transformer requires additional foundation and support structure construction, which increases the amount of engineering work and construction costs.

[0004] To improve wind turbine layout efficiency and reduce system costs, existing technologies propose placing the transformer substation directly inside or near the nacelle, a solution known as "substation moved to nacelle." This structure helps shorten cable distances, optimize energy transmission paths, reduce line losses, and simplify installation work at the tower. However, moving the substation to the nacelle significantly changes its operating environment, particularly necessitating addressing the following sealing-related technical challenges:

[0005] First, the nacelle is located at high altitude and is exposed to complex climatic conditions such as high humidity, rain, snow, and salt spray. Poor sealing can lead to moisture damage and short circuits in the transformer substation equipment, potentially threatening the safe operation of the wind turbine. Second, the transformer substation generates significant heat during operation. A fully enclosed structure could cause heat buildup and overheating. Therefore, achieving a balance between waterproof sealing, pressure equalization, heat dissipation and ventilation, and dust and corrosion protection are critical technical challenges that need to be addressed during the relocation of the transformer substation. Existing technologies typically employ a split structure, using rigid connectors or bolts to connect the bottom of the transformer substation to the top of the nacelle, with rubber gaskets or foam filling the joints to achieve basic sealing.

[0006] However, the existing solutions have revealed several shortcomings in practical applications: First, traditional sealing structures are mostly single-layer rubber strips or gaskets, lacking internal structural support and exhibiting poor elastic recovery, making them prone to sealing failure due to thermal expansion and contraction or equipment vibration. Second, the connection structure and sealing structure are independent of each other and cannot work in tandem; the connection process cannot automatically compensate for tolerances or offsets, resulting in low assembly efficiency and large errors. Furthermore, the seals generally employ passive compression, relying solely on tightening external bolts to create pressure, lacking dynamic self-adjustment capabilities and struggling to adapt to the complex environmental loads of high-altitude operations in wind farms. These problems lead to insufficient reliability of the sealing system and difficulties in maintenance and replacement, severely hindering the large-scale engineering implementation of the transformer substation relocation solution.

[0007] In view of this, we have studied and improved the existing problems and provided a sealing structure for the upward relocation of the transformer substation nacelle to solve the current problems. The aim of this technology is to solve the problems and improve the practical value. Summary of the Invention

[0008] The present invention aims to solve the problems of difficult sealing, complex structural installation and weak connection of box-type transformers after moving the nacelle in the prior art, and provides a sealing structure for moving the nacelle of box-type transformers that is structurally stable, reliably sealed and easy to install and maintain.

[0009] A sealing structure for a raised nacelle of a prefabricated transformer includes a sealing strip and a connecting assembly. The sealing strip has at least one hollow cavity extending along its length. A first base strip and a second base strip are fixedly sleeved on the inner side of the sealing strip, and both ends of the first and second base strips are provided with fasteners. The connecting assembly includes a fixed shaft seat, a movable shaft cover, a fixed pin fastener fixed to the bottom surface of the fixed shaft seat, and a rotating pin fastener rotatably mounted on the surface of the movable shaft cover. The surface of the movable shaft cover has a bearing ring for driving the rotating pin fastener to rotate. A sealing slip ring is slidably mounted on the inner side of the fixed shaft seat. A spring is provided on the top surface of the fixed shaft seat that abuts against the bottom surface of the movable shaft cover. A sliding pin is provided on the surface of the fixed shaft seat for guiding the movable shaft cover to move up and down. The rotating pin fastener and the fixed pin fastener have the same structure and are used for surface engagement with the prefabricated transformer and the wind turbine nacelle, respectively. The top surface of the fixed shaft seat has a toothed groove, and the bottom end of the rotating pin fastener has insert teeth for guiding the rotating pin fastener to deflect towards the toothed groove surface. Both the surfaces of the fixed shaft seat and the movable shaft cover have connecting plates for connecting with the fasteners.

[0010] With the above structure, the sealing strip forms an integral sealing frame around the interface between the transformer and the nacelle. The connecting components enable quick insertion and locking, allowing for efficient docking between equipment, reliable sealing, and easy installation.

[0011] According to the above sealing structure, the hollow cavity is a closed structure with elastic compression function to adapt to changes in the size of the connection gap between the transformer substation and the nacelle. Limiting structures are provided on both sides of the sealing strip for positioning and fixing within slots in the transformer substation or nacelle structure; the bottom of the sealing strip has an mounting surface that can be bonded to the sealed surface using structural adhesive or bonding material.

[0012] The above improvements enable the sealing strip to automatically adapt to the contact gap when compressed or connected, improving the sealing effect, simplifying the structural installation, and enhancing the reliability of the sealing strip under environments such as vibration and thermal expansion and contraction.

[0013] In a preferred embodiment, the invention can be further configured such that the cross-section of the hollow cavity is an approximately elliptical or strip-shaped groove structure to enhance its resilience and sealing performance. The sealing strip is made of EPDM rubber or silicone rubber, which possesses high resilience, aging resistance, UV resistance, and salt spray corrosion resistance. This configuration improves the overall structure's durability and stability in the high-altitude, high-humidity, and high-salt environment of the wind turbine nacelle, ensuring that the seal remains unchanged and does not fail during long-term operation.

[0014] In a preferred embodiment, the present invention can be further configured such that the connecting plates of the fixed shaft seat and the moving shaft cover are arranged in two sets perpendicular to each other, and are used for the assembly of multiple sealing strips to form a complete frame structure. This structural design helps to achieve high-precision docking and positioning of sealing strips in different directions, enabling the structure to form a stable and rigid closed sealing unit, effectively preventing air leakage, water leakage and deformation.

[0015] In a preferred embodiment, the present invention can be further configured as follows: the outer periphery of the sealing slip ring is provided with a threaded guide rod, and both the fixed shaft seat and the moving shaft cover have sleeve grooves that fit onto the surface of the threaded guide rod, for guiding and limiting the relative movement of the fixed shaft seat and the moving shaft cover; the upper and lower surfaces of the sealing slip ring are provided with elastic pins, and the elastic pins are arranged vertically between the opposing surfaces of the fixed shaft seat and the moving shaft cover, for realizing the floating support of the sealing slip ring. Through the floating support structure, the sealing slip ring can provide buffering and automatic adjustment during rotational connection, effectively absorbing errors and impacts during assembly, and improving the reliability and fatigue resistance of the overall connection.

[0016] In a preferred embodiment, the invention can be further configured such that: the bottom surface of the insert tooth is a spiral inclined plane, the tooth groove is adapted to the insert tooth structure, and the deflection motion is realized during the movement of the rotating pin relative to the tooth groove; a deflection spring fixed to the top surface of the fixed shaft seat is sleeved on the surface of the rotating pin for the deflection reset of the insert tooth. The above-mentioned deflection motion structure achieves smooth insertion and engagement through inclined plane meshing, and, in conjunction with the rotating structure, achieves efficient, stable, and automatically guided engagement, improving assembly convenience.

[0017] In a preferred embodiment, the present invention can be further configured such that the ends of the first base strip and the second base strip are respectively connected to the ends of the fixed shaft seat and the moving shaft cover via fasteners, thereby achieving synchronous movement of the first base strip and the second base strip during the relative movement of the fixed shaft seat and the moving shaft cover. This synchronous linkage between the structures ensures that the sealing structure maintains coordinated deformation and repositioning during assembly and disassembly, ensuring that the sealing performance is not disturbed and improving the precision of the mechanical connection.

[0018] In a preferred embodiment, the present invention can be further configured such that both the rotating pin and the fixed pin have rectangular or elliptical latches on their surfaces, and the rotating pin rotates 90 degrees relative to the moving shaft cover to achieve engagement with the transformer substation or wind turbine nacelle structure. This 90-degree rotation locking method makes the assembly process fast, safe, and repeatable, which is beneficial for quickly completing installation in high-altitude work scenarios, reducing operational risks and improving efficiency.

[0019] The beneficial effects achieved by this invention are as follows:

[0020] 1. In this invention, by setting a hollow cavity structure inside the sealing strip and using a highly elastic and highly durable material, and by setting a first base strip, a second base strip and a buckle to form a frame support, the sealing structure has good elastic adaptability, resilience and installation stability.

[0021] 2. In this invention, by setting a joining component, the alignment, insertion and locking with the transformer and the nacelle are completed on the structural surface. The joining component not only realizes the structural connection, but also provides auxiliary limiting and pre-tightening for the sealing strip. During the lifting and lowering of the moving shaft cover, it drives the first base strip and the second base strip to move together, thereby applying a uniform pressing force to the sealing strip, enhancing the sealing and rebound effect of the hollow cavity, and effectively suppressing problems such as water vapor infiltration and wind vibration damage. This structure can keep the entire sealing component in a long-term stable and tight state, adapting to the operating environment such as nacelle vibration and temperature difference deformation.

[0022] 3. In this invention, by incorporating a base strip within the sealing strip, and combining the elastic support effect of the sealing strip and the spring, a dynamic sealing solution of "flexible and adjustable + elastic compensation" is provided. This solution can automatically absorb deformation during operation, so that the sealing element is no longer passively compressed, but participates in the force transmission and dynamic adjustment of the entire connection system. This achieves a high degree of integration of structure, function, and mechanics, and significantly optimizes the overall assembly process and operational reliability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the sealing strip and the joining assembly according to an embodiment of the present invention;

[0025] Figure 3This is an exploded structural diagram of a joining component according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation structure of the transfer pin and the fixed pin according to an embodiment of the present invention;

[0027] Figure 5 This is an exploded view of the sealing strip according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the end face structure of the sealing strip according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the original state and locked state of the coupling component according to an embodiment of the present invention.

[0030] Figure label:

[0031] 100. Sealing strip; 110. First base strip; 120. Second base strip; 130. Fastener; 101. Hollow cavity;

[0032] 200. Connecting assembly; 210. Fixed shaft seat; 220. Moving shaft cover; 230. Turning pin; 240. Fixed pin; 250. Sealing slip ring; 260. Spring; 270. Sliding pin; 211. Gear groove; 221. Bearing ring; 222. Connecting plate; 231. Tooth; 251. Threaded guide rod; 252. Elastic pin. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0034] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0035] The following describes, with reference to the accompanying drawings, a sealing structure for the upward relocation of the substation's engine compartment, according to some embodiments of the present invention.

[0036] To make the technical solution of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 7 As shown, a sealing structure for the upward moving nacelle of a transformer substation includes a sealing strip 100 and a coupling assembly 200.

[0038] The sealing strip 100 is used to achieve circumferential sealing between the wind turbine nacelle and the upward-moving box-type transformer. It has at least one hollow cavity 101 extending along its length to provide elastic compression. A first base strip 110 and a second base strip 120 are fixedly sleeved on the inner side of the sealing strip 100. Both ends of the first base strip 110 and the second base strip 120 are provided with fasteners 130 for connection with the connecting assembly 200, forming a closed frame-shaped sealing structure.

[0039] The hollow cavity 101 is preferably a closed structure with a cross-sectional shape that is approximately elliptical or a strip-shaped groove, providing good resilience and sealing performance. The sealing strip 100 is made of EPDM rubber or silicone rubber, featuring high elasticity, aging resistance, UV resistance, and salt spray corrosion resistance, meeting the long-term service requirements of complex high-altitude environments. The sealing strip 100 has protruding limiting structures on both sides, allowing it to be inserted into slots in equipment joints for positioning; the bottom has an mounting surface for easy bonding and fixing to the surface of the wind turbine nacelle or transformer housing using structural adhesive or bonding materials, enhancing sealing reliability.

[0040] The coupling assembly 200 is used to reliably connect the various sealing structures and provides quick assembly and locking functions. The coupling assembly 200 includes a fixed shaft seat 210, a moving shaft cover 220, a fixed pin 240, and a rotating pin 230. The fixed pin 240 is fixedly installed at the bottom of the fixed shaft seat 210 for engagement with the wind turbine nacelle; the rotating pin 230 is rotatably installed on the upper surface of the moving shaft cover 220 for connection with the box-type transformer. The bottom end of the rotating pin 230 has insert teeth 231, which cooperate with the tooth groove 211 provided on the top surface of the fixed shaft seat 210, forming a deflection motion during locking to achieve automatic engagement with the external structure.

[0041] To control the rotation of the pivot pin 230, a bearing ring 221 is provided on the moving shaft cover 220 to drive the pivot pin 230 to rotate. A sliding pin 270 is provided between the moving shaft cover 220 and the fixed shaft seat 210 to guide its axial sliding. A spring 260 is provided between the lower part of the moving shaft cover 220 and the upper part of the fixed shaft seat 210 to provide elastic restoring force and ensure stable fit of the components during installation and disassembly. A deflection spring fixed to the top surface of the fixed shaft seat 210 is sleeved on the surface of the pivot pin 230 for deflection and restoring of the gear 231.

[0042] A sealing slip ring 250 is slidably mounted on the inner side of the fixed shaft seat 210. The outer periphery of the sealing slip ring 250 is provided with a threaded guide rod 251. Both the fixed shaft seat 210 and the moving shaft cover 220 have internal sleeve grooves to fit onto the surface of the threaded guide rod 251, thus guiding and limiting relative movement. To further enhance installation stability, the upper and lower surfaces of the sealing slip ring 250 are provided with several vertically arranged elastic pins 252 to form an elastic floating support structure, which acts as a buffer during structural connection.

[0043] Both the fixed shaft seat 210 and the moving shaft cover 220 of the joining assembly 200 are provided with joining plates 222 on their exteriors for connection with the fasteners 130 on the sealing strip 100, so as to achieve modular assembly and disassembly. The joining plates 222 are arranged perpendicularly to each other on the fixed shaft seat 210 and the moving shaft cover 220, so that multiple sealing strips 100 can be staggered and assembled into a frame structure, which is beneficial to forming a complete sealing frame at the interface between the bottom surface of the transformer and the nacelle.

[0044] Furthermore, the first base strip 110 and the second base strip 120 are respectively connected to the fixed shaft seat 210 and the moving shaft cover 220 through the end fastener 130. With the lifting and lowering movement of the fixed shaft seat 210 and the moving shaft cover 220, the linkage action of the sealing strip 100 can be realized, thereby improving the overall coordination of the structure.

[0045] In a preferred embodiment, the surfaces of the rotating pin 230 and the fixed pin 240 are provided with rectangular or elliptical buckle structures. The rotating pin 230 can be quickly engaged with the slot-type interface on the corresponding equipment by rotating 90 degrees, simplifying the operation steps and improving on-site assembly efficiency.

[0046] Through the above-mentioned structural design, this invention overcomes the problems of poor sealing reliability, insufficient structural rigidity, and difficulty in on-site assembly of traditional box-type substations after the nacelle is moved upwards. It achieves an integrated structure with highly elastic sealing and quick connection, which is particularly suitable for reliable connection between the nacelle and electrical modules in large wind power generation equipment.

[0047] Working principle and usage process of this invention:

[0048] Pre-installation preparation: Trim the four sealing strips 100 provided by the present invention to a suitable length and pre-assemble them into a closed frame. The four corners are connected to the connecting assembly 200 through the buckle 130. The fixed shaft seat 210 in the connecting assembly 200 is fixedly installed on the upper structure of the wind turbine nacelle by means of screws or welding.

[0049] Lowering the transformer substation: The prefabricated transformer substation is hoisted to the top of the nacelle, and its bottom is inserted into the inner side of the frame enclosed by the sealed structure through the alignment system; the bottom of the transformer substation makes initial contact with the pivot pin 230 on the upper part of the drive shaft cover 220.

[0050] As the downward movement continues, the rotating pin 230 on the upper part of the moving shaft cover 220 moves. Under the contact of the insert tooth 231 and the tooth groove 211, the rotating pin 230 automatically deflects. After deflecting 90°, the latch on the surface of the rotating pin 230 inserts into the bottom connection hole of the transformer. After being driven to reset by the deflection spring, the locking is completed. At the same time, the insert tooth 231 cooperates with the tooth groove 211, and after the fixed shaft seat 210 and the moving shaft cover 220 move relative to each other, they engage with the upper and lower surfaces of the sealing slip ring 250 to achieve a sealed contact between the fixed shaft seat 210 and the moving shaft cover 220.

[0051] The bottom surface of the transformer substation and the upper surface of the nacelle press against the upper and lower surfaces of the sealing strip 100. The sealing strip 100 makes interference contact, thereby sealing the bottom surface of the transformer substation and the surface of the nacelle, and further maintaining the locking stability of the connecting assembly 200 to the bottom surface of the transformer substation and the nacelle.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sealing structure for a relocated substation nacelle, characterized in that, include: A sealing strip (100) has at least one hollow cavity (101) inside, the hollow cavity (101) extends along the length of the sealing strip, and a first base strip (110) and a second base strip (120) are fixedly sleeved on the inner side of the sealing strip (100), and both ends of the first base strip (110) and the second base strip (120) are provided with fasteners (130). The coupling assembly (200) includes a fixed shaft seat (210), a movable shaft cover (220), a fixed pin (240) fixed to the bottom surface of the fixed shaft seat (210), and a rotating pin (230) rotatably mounted on the surface of the movable shaft cover (220). The surface of the movable shaft cover (220) is provided with a bearing ring (221) for driving the rotating pin (230) to rotate. A sealing slip ring (250) is slidably mounted on the inner side of the fixed shaft seat (210). The top surface of the fixed shaft seat (210) is provided with a spring (260) that abuts against the bottom surface of the movable shaft cover (220). The surface of the fixed shaft seat (210) is provided with a sliding pin (270) for guiding the movable shaft cover (220) to slide up and down. The transfer pin (230) and the fixed pin (240) have the same structure.

2. The sealing structure for the relocated nacelle of a transformer substation according to claim 1, characterized in that: The hollow cavity (101) is a closed structure with elastic compression function to adapt to the size change of the connection gap between the transformer and the nacelle; the sealing strip (100) has an outwardly protruding limiting structure on both sides of its edges; the bottom of the sealing strip (100) has an installation surface for connecting with the equipment.

3. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The cross-section of the hollow cavity (101) is approximately elliptical or strip-shaped, and the material of the sealing strip (100) is EPDM rubber or silicone rubber.

4. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The top surface of the fixed shaft seat (210) is provided with a tooth groove (211), and the bottom end of the rotating pin buckle (230) is provided with a tooth (231) for guiding the rotating pin buckle (230) to deflect against the surface of the tooth groove (211); the surfaces of the fixed shaft seat (210) and the moving shaft cover (220) are both provided with a connecting plate (222) for connecting with the buckle seat (130).

5. A sealing structure for a relocated substation nacelle according to claim 4, characterized in that: The bottom surface of the insert tooth (231) is spiral inclined, and the tooth groove (211) is adapted to the structure of the insert tooth (231). The surface of the pivot pin (230) is fitted with a deflection spring fixed to the top surface of the fixed shaft seat (210).

6. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The surface mating plates (222) of the fixed shaft seat (210) and the moving shaft cover (220) are both two sets arranged perpendicularly to each other, and are used for the assembly of the two sealing strips (100).

7. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The outer periphery of the sealing slip ring (250) is provided with a threaded guide rod (251), and the surfaces of the fixed shaft seat (210) and the moving shaft cover (220) are both provided with a sleeve groove that fits onto the surface of the threaded guide rod (251); the upper and lower surfaces of the sealing slip ring (250) are provided with elastic pins (252), and the elastic pins (252) are arranged vertically between the opposite surfaces of the fixed shaft seat (210) and the moving shaft cover (220).

8. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The ends of the first base strip (110) and the second base strip (120) are respectively connected to the ends of the fixed shaft seat (210) and the moving shaft cover (220) via fasteners (130).

9. A sealing structure for a relocated substation nacelle according to claim 1, characterized in that: The surfaces of both the rotating pin (230) and the fixed pin (240) are provided with rectangular or elliptical buckle tongues.

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