Dry-type air-core reactor protective cover and dry-type air-core reactor

Abstract

The invention discloses a dry-type air-core reactor protective cover and a dry-type air-core reactor, and relates to the technical field of reactors. The protective cover comprises a heat dissipation protective cap (200) and an insulating antimagnetic spherical wind cap (300), a heat dissipation window (221) is arranged on a side cover (220) of the heat dissipation protective cap (200), and the protective cover is characterized in that a plurality of groups of protective partition plates (222) are arranged in the heat dissipation window (221). The protective partition plate (222) is formed by crossing T-shaped inner partition plates (2221) and linear outer partition plates (2222), and the horizontal parts of the adjacent inner partition plates (2221) are overlapped and arranged at specific gaps and angles to form a labyrinth channel. According to the structure, low wind resistance and efficient heat dissipation are guaranteed, meanwhile, excellent rainproof and bird-proof effects are achieved through multi-stage blocking and flow guiding, and the technical problem that heat dissipation and protection of the outdoor electric reactor are difficult to achieve at the same time is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of dry-type air-core reactor technology, specifically to a protective cover for a dry-type air-core reactor and a dry-type air-core reactor. Background Technology

[0002] Dry-type air-core reactors are widely used as key reactive power compensation and current limiting devices in power systems due to their advantages such as being coreless, having good linearity, and simple structure. However, their windings are directly exposed to the air, posing severe environmental challenges during long-term outdoor operation.

[0003] First, to ensure that the temperature rise of the reactor during normal operation is within the allowable range, its protective structure must guarantee sufficient ventilation and heat dissipation capacity. Existing protective covers mostly adopt a combination of airtight rainproof and mesh bird-proof structures. However, while this provides heat dissipation advantages, it also introduces new problems: in windy and rainy weather, especially with strong crosswinds, rainwater can easily penetrate the reactor's interior through the heat dissipation channels and bird netting. On the one hand, moisture will reduce the insulation performance of the windings, causing corona discharge or even short-circuit faults, seriously threatening the safety of the power grid; on the other hand, accumulated water will accelerate the electrochemical corrosion of metal components, shortening the equipment's lifespan.

[0004] Therefore, there is an urgent need in this field for a new protection solution that can significantly improve its rainproof performance while maintaining efficient heat dissipation, thereby ensuring the long-term operational reliability and safety of dry-type air-core reactors in complex outdoor environments. Summary of the Invention

[0005] In view of the problems and shortcomings of the existing technology, the present invention provides a protective cover for a dry-type air-core reactor and a dry-type air-core reactor.

[0006] The technical solution of this invention is as follows: A protective cover for a dry-type air-core reactor includes a heat dissipation protective cap and an insulating, anti-magnetic spherical vent cap connected to its top. The heat dissipation protective cap includes a top plate and side covers, with a plurality of heat dissipation windows evenly distributed along the circumference of the side covers. Multiple protective partitions are arranged in a circumferential array within each heat dissipation window, and each protective partition extends along the height direction of the heat dissipation window to achieve the functions of heat dissipation, rain protection, and bird protection.

[0007] The protective partition includes an inner partition and an outer partition that are cross-connected. The inner partition has a T-shaped cross-section, with the vertical portion of the T-shape forming an acute angle C with the horizontal portion, and the horizontal portion forming an acute angle B with the tangent of the circumference of the protective partition. The outer partition has a straight cross-section and is perpendicularly connected to the vertical portion of the inner partition. The horizontal portions of adjacent inner partitions are stacked with a gap between them. The horizontal portions of the inner partitions are located inside the side cover, while the vertical portions of the inner partitions and the outer partition both extend outwards to the outside of the side cover.

[0008] Furthermore, the acute angle B is 12°-18°. This angle range has been verified through fluid simulation and experiments, and can optimally balance airflow guidance and wind resistance, guiding hot air out while setting a non-vertical tortuous path for rainwater intrusion.

[0009] Furthermore, the acute angle C is 60°-70°. This angle allows the vertical portion of the inner partition to directly face and block radially intruding raindrops at an optimal angle, while cooperating with the horizontal portion to change the airflow direction.

[0010] Furthermore, the horizontal overlap dimension of two adjacent inner partitions is 0.2-0.3 times their length. This overlap ensures structural compactness while creating a sufficiently long labyrinthine airflow channel between adjacent partitions, enhancing rainproof performance.

[0011] Furthermore, the horizontal gap between two adjacent inner partitions is 2.5mm-4mm, and the gap gradually widens from the inside to the outside. The widening gap forms a drainage channel, which helps to guide the small amount of water droplets and condensate that have entered outwards under the action of gravity and airflow, effectively preventing them from seeping inwards.

[0012] Furthermore, the widening angle D of the gap between the horizontal portions of two adjacent inner partitions is 2°-4°. This small widening angle is a key parameter for ensuring the smooth drainage of condensate and intruding rainwater; if the angle is too small, drainage will be impeded, and if it is too large, the rainproof capability will be weakened.

[0013] In another embodiment, the heat dissipation cap is connected to the reactor body via a connecting assembly, and the side cover is configured to passively rotate in the wind. This design allows the side cover to automatically rotate using wind power in windy or rainy weather, using centrifugal force to shake off rainwater adhering to its inner and outer surfaces, thus achieving self-cleaning.

[0014] Furthermore, the connecting assembly includes a connecting seat, a support column, and a mounting bracket. The bottom of the connecting seat is coaxially connected to the top of the winding sheath, and the upper part is coaxially connected to the support column. The mounting bracket has a central connecting portion, the inner hole of which is rotatably connected to the support column via a bearing, and the outer wall is connected to the side cover via radial connecting plates. This structure provides reliable support for the stable rotation of the side cover, ensuring concentricity and stability during rotation.

[0015] In another embodiment, the heat dissipation protective cap is connected to the reactor body via a connecting component and a driving device, and the side cover is configured to rotate passively under the action of wind, and also actively rotate under the drive of the driving device. This allows for all-weather, intelligent waterproof protection in the absence of wind or in light wind but with rain, firstly, by actively driving the side cover to rotate, water can be forcibly shaken off, and secondly, the rotation of the side cover creates a swirling airflow inside, which further improves the heat dissipation capacity.

[0016] A dry-type air-core reactor includes a reactor body, which includes a bottom support insulator, a winding enclosure, an interlayer support insulator, an equalizing ring, and a star frame. The reactor body is also integrated with a heat dissipation and protective cap as described above.

[0017] The beneficial effects of this invention are: Through a unique combination of T-shaped and straight-line protective partitions, a multi-level, labyrinthine protective barrier is constructed. This structure exhibits low wind resistance when air flows through it, effectively maintaining ventilation and heat dissipation efficiency. When wind and rain strike, the vertical sections of the outer and inner partitions form the first line of defense, blocking most of the rainwater, while the horizontal section of the inner partitions and its overlapping gaps form the second line of defense, effectively condensing and diverting the small amount of water vapor that enters through the bypass flow, achieving an excellent balance between heat dissipation and rain protection.

[0018] The dense and complex array of protective baffles, with physical gaps much smaller than the size of a bird, can effectively prevent birds from crossing and nesting inside the reactor body, thus solving the safety hazards and pollution problems caused by bird habitats.

[0019] This significantly improves the operational reliability and service life of reactors in outdoor environments. Attached Figure Description

[0020] Figure 1 This is a perspective view of the reactor with a protective cover in Example 1; Figure 2 A 3D view of the protective shield; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 3 A partially enlarged view of the cross-section of the central protective partition; Figure 5 for Figure 4 Rainproof status diagram; Figure 6 This is a cross-sectional view of the reactor with a protective cover in Example 2; In the diagram: 100, reactor body; 200, heat dissipation protective cap; 300, insulated and anti-magnetic spherical vent cap; 400, connecting assembly; 210. Top plate; 220. Side cover; 221. Ventilation window; 222. Protective partition; 2221. Inner partition; 2222. Outer partition; 410. Connecting seat; 420. Support column; 430. Mounting bracket. Detailed Implementation

[0021] The technical means adopted to achieve the intended purpose of the present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Example 1 See Figure 1 A protective cover for a dry-type air-core reactor includes a heat dissipation protective cap 200 and an insulating, anti-magnetic spherical vent cap 300 fixedly connected to its top. The heat dissipation protective cap 200 includes a top plate 210 and a side cover 220, with a plurality of heat dissipation windows 221 evenly distributed along its circumference on the side cover 220.

[0023] As the core of this invention, see Figure 2 and Figure 3 The heat dissipation window 221 is equipped with multiple protective baffles 222 arranged in a circumferential array, with each protective baffle 222 extending along the height of the heat dissipation window 221. This design constitutes a continuous protective body that runs through the height of the air duct, and its core function is to achieve efficient heat dissipation, strict rain protection, and reliable bird protection in a coordinated manner.

[0024] See Figure 3 and Figure 4 The protective partition 222 is composed of an inner partition 2221 and an outer partition 2222 that are cross-connected. The inner partition 2221 has a precise T-shaped cross-section, and the horizontal part of the T-shape forms an acute angle B with the tangent of the circumference of the protective partition 222. This angle is preferably 12°-18° (e.g., 16°). The purpose of this angle design is to guide airflow more smoothly through the protective partition 222, forming a low-pressure area, thereby "drawing" hot air from inside the reactor, enhancing convective heat dissipation, and at the same time providing a non-vertical tortuous path for rainwater intrusion. The vertical part of the T-shape forms an acute angle C with its horizontal part, preferably 60°-70° (e.g., 63°). This angle allows the vertical part to more effectively meet and directly block radially incoming raindrops.

[0025] The outer partition 2222 has a straight cross-section and intersects with and is perpendicularly connected to the vertical part of the inner partition 2221. The outer partition 2222 forms the first physical barrier against rainwater and foreign objects.

[0026] In this arrangement, the horizontal portions of two adjacent inner partitions 2221 are stacked on top of each other with gaps, and the stacking dimension is preferably 0.2-0.3 times (e.g., 0.25 times) the length of the horizontal portion. This stacking structure forms a labyrinthine passage. The horizontal portion of the inner partition 2221 is located inside the side cover 220, while its vertical portion and the outer partition 2222 both extend outward to the outside of the side cover 220. This inward and outward extending structure together constitutes a three-dimensional, multi-layered protective space.

[0027] See Figure 5 When wind carrying rainwater blows towards the protective partition 222 from the outside, most of the rainwater is directly blocked and guided down by the vertical parts of the outer partition 2222 and the inner partition 2221. A small amount of humid airflow that enters around the partition condenses further on the partition surface as it passes through the labyrinthine channel formed by the horizontal part of the inner partition 2221, with gaps of 2.5mm-4mm (gradually widening from the inside to the outside, with a widening angle D preferably 2°-4°, such as 3°). The remaining water droplets in the airflow condense further due to the sudden turning and widening of the channel, adhering to the partition surface, and are ultimately guided to the outside by gravity along the widening gaps, thus achieving excellent rainproof performance. This widening angle D is a key design feature that allows condensate and intruding rainwater to drain smoothly rather than seep inwards.

[0028] In addition, the densely arranged array of protective partitions 222, with physical gaps much smaller than the size of birds, can effectively prevent birds from crossing and nesting inside the reactor body, thus playing a reliable bird-proof role.

[0029] Furthermore, the side cover 220 in this embodiment adopts a multi-layer modular structure design to better adapt to the shape of the winding enclosure 120 of reactors with different capacities. Specifically, the side cover 220 includes multiple side cover layers corresponding to each layer of the reactor winding enclosure 120, as well as a transition side cover layer connecting the top plate 210 and the top winding enclosure. Each side cover layer is composed of multiple circumferentially distributed and detachably connected spliced ​​side plates 223. Each spliced ​​side plate 223 is provided with a heat dissipation window 221 with a projection shape of approximately rectangle. Each heat dissipation window 221 is provided with several protective partitions 222 arranged in a circumferential array, thereby forming a continuous and uniform labyrinthine protective channel on the entire side cover surface.

[0030] Specifically, the side covers are made of high-performance FR4 composite material. Furthermore, the side cover layers feature a differentiated structural design: the top side cover layer one is constructed as a vertical tube; while the lower side cover layers two and three are designed with conical flares. These conical flares cause the lower ends of side cover layers two and three to extend outwards, forming a water-guiding eave. This design ensures that when rainwater slides down the surface of the side cover, it is guided away from the winding enclosure 120° area of ​​the reactor body via the water-guiding eave, effectively preventing rainwater from flowing directly towards or splashing onto the reactor body below under gravity, further enhancing the overall waterproof reliability.

[0031] The aforementioned side covers are reliably fixed and easily assembled via bolted connections or snap-fit ​​joints. Similarly, the individual splicing side plates 223 constituting each side cover are also connected via bolted connections or snap-fit ​​joints. This modular and detachable design not only facilitates transportation and on-site assembly but also greatly simplifies subsequent maintenance or component replacement.

[0032] Example 2 In this embodiment, the heat dissipation protective cap 200 is connected to the reactor body via the connecting component 400, and the side cover 220 is configured to be able to passively rotate under the action of wind.

[0033] Specifically, see Figure 6 The connecting assembly 400 includes a connecting base 410, a support column 420, and a mounting bracket 430. The bottom of the connecting base 410 is coaxially connected to the equalizing plate on top of the winding enclosure 120 via a circumferentially arrayed connecting plate. The connecting base 410 is made of cast aluminum, which serves to equalize voltage without affecting the magnetic field of the reactor body. This provides a stable mounting base for the heat dissipation cap 200 and ensures a reliable connection with the equalizing plate. The upper part of the connecting base 410 is coaxially connected to the support column 420 via a flange, and the top of the support column 420 is fixedly connected to the top plate 210. The support column 420 is made of stainless steel tubing coated with an alumina or chromium oxide ceramic layer to ensure its structural strength and avoid affecting the reactor's magnetism and eddy current losses generated by the alternating magnetic field. The mounting bracket 430 has a sleeve-shaped central connecting part. The inner hole of the central connecting part is rotatably connected to the support column 420 through a bearing. Its outer wall is fixedly connected to the inner wall of the side cover 220 through radially distributed connecting plates. The top of the side cover 220 and the bottom of the top plate 210 are slidably engaged through a groove structure.

[0034] When the side cover 220 is subjected to strong winds and heavy rain, the wind will drive the mounting frame 430, which is integrally connected to the side cover 220, to rotate relative to the stationary support column 420. This will efficiently remove rainwater adhering to the surface of the side cover 220 through centrifugal force, achieving a self-cleaning function and further improving dynamic rainproof capability. At the same time, under normal light wind conditions, the side cover 220 can also rotate freely. Its movement can effectively deter birds and prevent them from approaching and nesting. The mounting frame 430 is made of cast aluminum or stainless steel with a ceramic coating, and the bearings are ceramic bearings to ensure its structural strength, avoid affecting the magnetism of the reactor, and prevent eddy current losses in alternating magnetic fields.

[0035] The aforementioned rotatable side cover design enables the protective cover to achieve passive self-cleaning under wind force. Utilizing centrifugal force, it passively and efficiently removes surface water in harsh weather conditions, significantly improving the product's dynamic waterproof rating and environmental adaptability. This design fundamentally resolves the limitation of traditional fixed protective covers in terms of limited functionality, significantly enhancing the long-term operational reliability and service life of dry-type air-core reactors in complex outdoor environments.

[0036] Example 3 In this embodiment, the heat dissipation protective cap 200 is connected to the reactor body through the connecting component 400 and the driving device, and the side cover 220 is configured to rotate passively under the action of wind and actively under the drive of the driving device.

[0037] The difference between the connecting assembly 400 in this embodiment and that in embodiment 2 is that the lower part of the support column 420 is connected to the connecting seat 410 via two one-way bearings 421 with opposite locking directions, and the top of the support column 420 is rotatably connected to the top plate 210 via bearings. The driving device 500 includes a motor and a pair of meshing gears. The motor is fixedly mounted on the bottom surface of the top plate 210 and transmits motion and power to the support column 420 through the gears, thereby driving the support column 420 to rotate when the motor starts. The one-way bearings are ceramic bearings.

[0038] When the motor stops and the wind is strong enough, the side cover 220 rotates passively under the influence of the wind. At this time, the mounting bracket 430 drives the outer ring of the one-way bearing to rotate relative to the support column 420. When it is raining and the wind is not strong enough to drive the side cover 220 to rotate, the motor is started, and the inner ring of the support column 420 is driven to rotate through gear transmission. At this time, the inner ring of one of the one-way bearings is locked to the outer ring (the other one-way bearing is in an overrunning state), thereby driving the mounting bracket 430 and the side cover 220 to rotate together, realizing the active rotation function. The centrifugal force throws away the surface water, significantly improving the rainproof effect. When the motor reverses, the other one-way bearing is locked, and the previously locked bearing is released, thereby driving the mounting bracket 430 and the side cover 220 to rotate in the opposite direction, thus realizing the active forward and reverse rotation function of the side cover 220.

[0039] The rotatable side cover design enables passive self-cleaning under wind power, and also allows for active rotation via a drive mechanism. This utilizes centrifugal force to actively and thoroughly remove surface water in harsh weather conditions, significantly improving dynamic waterproofing and environmental adaptability. Two unidirectional bearings with opposite locking directions allow for switching between passive and active forward / reverse rotation of the entire protective cover, fundamentally resolving the limitation of traditional single-function protective covers and significantly enhancing the reactor's operational reliability and lifespan in outdoor environments.

[0040] Furthermore, an anemometer and humidity sensor are installed on the top of the top plate 210 to automatically control the start, stop and direction of the motor by detecting the ambient wind speed and air humidity in real time, so as to achieve intelligent operation.

[0041] When the wind speed is no more than 5 m / s, if it rains (humidity is greater than the set value), the motor will start and drive the side cover to rotate actively; if it does not rain, the motor will stop.

[0042] When the wind speed is greater than 5 m / s but not greater than 15 m / s, the motor stops and the side cover is automatically driven to rotate by the wind to improve the rainproof performance.

[0043] When the wind speed is greater than 15m / s, disconnect the motor power supply to prevent wind load from damaging the motor.

[0044] Example 4 A dry-type air-core reactor, see Figure 1 The reactor body includes a bottom support insulator, a winding enclosure, an interlayer support insulator, an equalizing ring, and a star frame. The reactor body is also integrated with a heat dissipation protective cap as described in any one of Embodiments 1 to 3.

[0045] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, improvements, etc., made without departing from the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A protective cover for a dry-type hollow reactor, comprising a heat dissipation protective cap (200) and an insulating antimagnetic spherical vent cap (300) connected to its top, wherein the heat dissipation protective cap (200) comprises a top plate (210) and a side cover (220), and the side cover (220) has a plurality of heat dissipation windows (221) evenly distributed along its circumference; characterized in that, The heat dissipation window (221) is provided with a plurality of protective partitions (222) arranged in a circumferential array. Each of the protective partitions (222) extends along the height direction of the heat dissipation window (221) to achieve the functions of heat dissipation, rain protection and bird protection. The protective partition (222) includes an inner partition (2221) and an outer partition (2222) that are cross-connected. The cross-section of the inner partition (2221) is T-shaped, with the vertical part of the T-shape forming an acute angle C with the horizontal part, and the horizontal part forming an acute angle B with the tangent of the circumference of the protective partition (222). The outer partition (2222) has a straight cross section and is perpendicularly connected to the vertical part of the inner partition (2221). The horizontal portions of two adjacent inner partitions (2221) are stacked with a gap between them. The horizontal portion of the inner partition (2221) is located inside the side cover (220), while the vertical portion of the inner partition (2221) and the outer partition (2222) both extend outward to the outside of the side cover (220).

2. The protective cover according to claim 1, characterized in that, The acute angle B is 12°-18°.

3. The protective cover according to claim 2, characterized in that, The acute angle C is 60°-70°.

4. The protective cover according to any one of claims 1 to 3, characterized in that, The horizontal overlap dimension of two adjacent inner partitions (2221) is 0.2-0.3 times their length.

5. The protective cover according to claim 4, characterized in that, The horizontal gap between two adjacent inner partitions (2221) is 2.5mm-4mm, and the gap gradually increases from the inside to the outside.

6. The protective cover according to claim 5, characterized in that, The widening angle D of the gap between the horizontal portions of two adjacent inner partitions (2221) is 2°-4°.

7. The protective cover according to claim 1, characterized in that, The heat dissipation protective cap (200) is connected to the reactor body (100) via a connecting assembly (400), and the side cover (220) is configured to be able to passively rotate under the action of wind.

8. The protective cover according to claim 7, characterized in that, The connecting assembly (400) includes a connecting seat (410), a support column (420), and a mounting bracket (430). The bottom of the connecting seat (410) is coaxially connected to the top of the winding enclosure (120), and the upper part is coaxially connected to the support column (420). The mounting bracket (430) has a central connecting part. The inner hole of the central connecting part is rotatably connected to the support column (420) through a bearing, and the outer wall is connected to the side cover (220) through a radial connecting plate.

9. The protective cover according to claim 1, characterized in that, The heat dissipation protective cap (200) is connected to the reactor body through the connecting component (400) and the driving device, and the side cover (220) is configured to be able to rotate passively under the action of wind and also to rotate actively under the drive of the driving device.

10. A dry-type air-core reactor, comprising a reactor body, the reactor body including a bottom support insulator, a winding enclosure, an interlayer support insulator, an equalizing ring, and a star-shaped frame, characterized in that, It also integrates a heat dissipation protective cap as described in any one of claims 1 to 9 on its exterior.

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