Top cover and box-type substation

Abstract

The utility model relates to the technical field of components or accessories of a box body of a distribution substation or a switch device, in particular to a top cover and a box-type substation. The top cover comprises a top cover framework, the top cover framework comprises side frames used for being connected with the box-type substation, convection holes are formed in the side frames, the top cover framework further comprises reinforcing purlines, the reinforcing purlines are fixed to the side frames through supporting beams, the two ends of the supporting beams are fixed to the side frames, and outer cover plates are installed on the supporting beams. The side face of the outer cover plate is fixed to the side frame and the reinforcing purline, an air inlet bottom plate is installed on the inner wall of the side frame, an air inlet hole is formed in the air inlet bottom plate, a heat preservation cavity is formed by a space defined by the outer cover plate, the reinforcing purline, the side frame and the air inlet bottom plate, the reinforcing purline is of a U-shaped structure, a notch of the reinforcing purline faces upwards, and heat dissipation holes are formed in the side vertical face of the reinforcing purline. A top cover ridge tile is arranged above the reinforcing purline, an opening is formed in the top cover ridge tile, and vent holes are formed in the side vertical face of the top cover ridge tile; the top cover can resist low temperature in winter and isolate high temperature in summer.

Description

Technical Field

[0001] This utility model relates to the technical field of components or accessories for the enclosure of power distribution substations or switchgear, and particularly to a top cover and a box-type substation. Background Technology

[0002] Prefabricated substations, also known as box-type substations, are factory-prefabricated, compact indoor / outdoor power distribution equipment that integrates high-voltage switchgear, distribution transformers, and low-voltage distribution devices according to a specific wiring scheme. They organically combine transformer voltage reduction and low-voltage distribution functions, housed within a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, theft-proof, heat-insulated, and fully enclosed steel structure enclosure. This structure results in a small size, light weight, and small footprint, making it suitable for residential communities, urban power distribution networks, commercial centers, industrial parks, and other locations, providing a safe and reliable power supply for people's work and lives. As a crucial component of the power system, the heat dissipation, rainproof, and dustproof performance of box-type substations plays a key role in the stable operation and lifespan of the equipment. Currently, a top cover is often installed on the top of the box-type substation enclosure to achieve heat dissipation while preventing rainwater ingress.

[0003] For example, Chinese invention patent CN109004564B, with an authorization announcement date of September 22, 2020, discloses a box-type substation enclosure and its top cover. The top cover includes a top cover frame formed by two crossbeams and two longitudinal beams, and an outer cover plate that completely covers the top cover frame. The lower side of the outer cover plate has a U-shaped heat dissipation channel plate parallel to the crossbeams, forming a heat dissipation channel with the outer cover plate. The heat dissipation channel plate has an air inlet, and the crossbeams and longitudinal beams are respectively provided with crossbeam ventilation openings and... The air outlets of the longitudinal beams and the two ends of the heat dissipation channel plate extend horizontally along the length of the crossbeams to connect with the longitudinal beams. The heat dissipation channel and the air outlet of the longitudinal beams are also connected. The heat inside the box-type substation box enters the heat dissipation channel from the air inlet and flows along the heat dissipation channel to be discharged from the air outlet of the longitudinal beams. In addition, a flat partition plate is connected between the crossbeams and the heat dissipation channel plate. The lower surface of the flat partition plate has a long strip gap parallel to the crossbeams. The long strip gap is also connected with the crossbeam ventilation openings, allowing external air to enter from the crossbeam ventilation openings and enhancing the ventilation effect.

[0004] When in use, the aforementioned top cover can only reach the air outlet of the longitudinal beam through the heat dissipation channel for heat dissipation. The heat dissipation space is small and the heat dissipation efficiency is poor. Especially in the high temperature environment of summer, the heat dissipation efficiency of the box-type substation is even worse. Heat accumulation can easily cause equipment failure inside the box-type substation. Moreover, in the low temperature rain and snow environment of winter, the top cover cannot resist the low temperature and cannot maintain the normal operating temperature of the box-type substation, which can easily cause the equipment inside the box-type substation to malfunction. Utility Model Content

[0005] The purpose of this invention is to provide a top cover that addresses the problems of poor heat dissipation efficiency in prefabricated substation enclosures during high-temperature summers, leading to heat accumulation and potential equipment malfunctions; and the inability of the top cover to withstand low temperatures and maintain the normal operating temperature of the prefabricated substation during low-temperature rain and snow in winter. Furthermore, this invention aims to provide a prefabricated substation that, by installing the aforementioned top cover, solves the problems of heat accumulation during high temperatures in summer and low temperatures in winter, preventing the prefabricated substation from operating normally.

[0006] To achieve the above objectives, the top cover of this utility model adopts the following technical solution:

[0007] The top cover includes a top cover frame, which includes a side frame for connecting to the prefabricated substation. The side frame has convection holes. The top cover frame also includes reinforcing purlins. The two ends of the reinforcing purlins extend along the length of the side frame and are fixed to the side frame via support beams. The two ends of the support beams extend along the width of the side frame and are fixed to the side frame. An outer cover plate is installed on the support beam. The sides of the outer cover plate are fixed to the side frame and the reinforcing purlins respectively. An air intake base plate is installed on the inner wall of the side frame. The air intake base plate has air intake holes. The space enclosed by the outer cover plate, the reinforcing purlins, the side frame, and the air intake base plate constitutes an insulation cavity. The reinforcing purlins have a U-shaped structure with the groove facing upwards. They have heat dissipation holes on their side facade. A top cover ridge tile is installed above the reinforcing purlins. The reinforcing purlins are located inside the top cover ridge tile. The top cover ridge tile has an opening communicating with the groove of the reinforcing purlins. It has ventilation holes on its side facade.

[0008] Furthermore, multiple support beams are spaced apart along the length of the side frame, and the support beams, reinforcing purlins, and side frame together constitute the top cover frame.

[0009] Furthermore, the support beam is a triangular beam, and the outer cover plate is located on the two inclined surfaces of the triangular beam.

[0010] Furthermore, the groove of the reinforcing purlin is provided with a support body for supporting the ridge tile of the roof cover. The upper end of the support body extends out of the groove of the reinforcing purlin and is connected to the ridge tile of the roof cover. The height of the support body is greater than the sum of the heights of the ridge tile of the roof cover and the reinforcing purlin, and there is a gap between the ridge tile of the roof cover and the outer cover plate. A pad is provided in the gap, and the pad connects the ridge tile of the roof cover and the outer cover plate.

[0011] Furthermore, there is a gap between the side surface of the support body and the side surface of the reinforcing purlin, which constitutes a gas flow gap.

[0012] Furthermore, the outer cover plate is connected to an upwardly inclined baffle plate on the side near the reinforcing purlin, and a ventilation space is provided between the baffle plate and the side facade of the roof ridge tile.

[0013] Furthermore, the baffle plate includes an inclined portion, a vertical portion, and an eave portion. The two ends of the vertical portion are connected to the inclined portion and the eave portion respectively, and the side facade is flush with the side facade of the support body. The eave portion extends upward at an angle away from the reinforcing purlin. The inclined portion is connected to the outer cover plate and has the same inclination angle as the outer cover plate. The inclined portion is located above the gas flow gap.

[0014] Furthermore, the inclined portion, vertical portion, and eaves portion of the water baffle are integrally bent into shape.

[0015] Furthermore, the gap between the top cover ridge tile and the outer cover plate forms a water guiding channel.

[0016] Beneficial Effects: The top cover of this utility model is an improved invention. By setting reinforcing purlins and supporting beams, the overall stability of the top cover frame can be improved. When the top cover frame is connected to the prefabricated substation, the connection reliability between the top cover and the prefabricated substation can be improved. The outer cover plate covers the top cover frame, preventing rain and snow from entering the top cover. The heat insulation cavity formed by the outer cover plate, reinforcing purlins, side frames, and air intake bottom plate can concentrate the heat generated by the prefabricated substation in low winter temperatures, resisting the low external temperature and preventing malfunctions caused by excessively low internal temperature of the prefabricated substation. It can also insulate against high summer temperatures, preventing high temperatures from affecting the prefabricated substation. The internal temperature is controlled; at the same time, during the high temperatures of summer, the heat inside the prefabricated substation can enter the insulation cavity through the air inlet holes on the air inlet base plate, and then dissipate to the outside of the top cover through the convection holes on the side frame. In addition, the heat inside the prefabricated substation can also enter the insulation cavity through the air inlet holes, and then enter the groove of the reinforcing purlin through the heat dissipation holes, and then enter the opening of the top cover ridge tile connected to the groove, and finally dissipate to the outside of the top cover through the vent holes of the top cover ridge tile, forming two heat dissipation channels, which further improves the heat dissipation efficiency and ensures that the heat inside the prefabricated substation can be quickly dissipated during the high temperatures of summer.

[0017] The prefabricated substation of this utility model adopts the following technical solution:

[0018] A prefabricated substation includes a top cover; the top cover includes a top cover frame, which includes side frames for connecting to the prefabricated substation. The side frames have convection holes. The top cover frame also includes reinforcing purlins, with both ends extending along the length of the side frames and fixed to the side frames via support beams. Both ends of the support beams extend along the width of the side frames and are fixed to them. An outer cover plate is installed on the support beams, with its sides fixed to the side frames and reinforcing purlins respectively. An air intake base plate is installed on the inner wall of the side frames, with air intake holes on the base plate. The space enclosed by the outer cover plate, reinforcing purlins, side frames, and air intake base plate constitutes an insulation cavity. The reinforcing purlins have a U-shaped structure with the groove facing upwards, and their side surfaces have heat dissipation holes. A top cover ridge tile is located above the reinforcing purlins, with the reinforcing purlins inside the ridge tile. The ridge tile has an opening communicating with the groove of the reinforcing purlins, and its side surfaces have ventilation holes.

[0019] Furthermore, multiple support beams are spaced apart along the length of the side frame, and the support beams, reinforcing purlins, and side frame together constitute the top cover frame.

[0020] Furthermore, the support beam is a triangular beam, and the outer cover plate is located on the two inclined surfaces of the triangular beam.

[0021] Furthermore, the groove of the reinforcing purlin is provided with a support body for supporting the ridge tile of the roof cover. The upper end of the support body extends out of the groove of the reinforcing purlin and is connected to the ridge tile of the roof cover. The height of the support body is greater than the sum of the heights of the ridge tile of the roof cover and the reinforcing purlin, and there is a gap between the ridge tile of the roof cover and the outer cover plate. A pad is provided in the gap, and the pad connects the ridge tile of the roof cover and the outer cover plate.

[0022] Furthermore, there is a gap between the side surface of the support body and the side surface of the reinforcing purlin, which constitutes a gas flow gap.

[0023] Furthermore, the outer cover plate is connected to an upwardly inclined baffle plate on the side near the reinforcing purlin, and a ventilation space is provided between the baffle plate and the side facade of the roof ridge tile.

[0024] Furthermore, the baffle plate includes an inclined portion, a vertical portion, and an eave portion. The two ends of the vertical portion are connected to the inclined portion and the eave portion respectively, and the side facade is flush with the side facade of the support body. The eave portion extends upward at an angle away from the reinforcing purlin. The inclined portion is connected to the outer cover plate and has the same inclination angle as the outer cover plate. The inclined portion is located above the gas flow gap.

[0025] Furthermore, the inclined portion, vertical portion, and eaves portion of the water baffle are integrally bent into shape.

[0026] Furthermore, the gap between the top cover ridge tile and the outer cover plate forms a water guiding channel.

[0027] Beneficial Effects: This utility model of a prefabricated substation is an improved invention. By setting reinforcing purlins and supporting beams, the overall stability of the top cover frame can be improved. When the top cover frame is connected to the prefabricated substation, the connection reliability between the top cover and the prefabricated substation can be improved. Furthermore, the outer cover plate covers the top cover frame, preventing rain and snow from entering the top cover. The heat insulation cavity formed by the outer cover plate, reinforcing purlins, side frames, and air intake bottom plate can concentrate the heat generated by the prefabricated substation in low winter temperatures, resisting external low temperatures and preventing malfunctions caused by excessively low internal temperatures. It can also insulate against high summer temperatures, preventing them from affecting the internal temperature of the prefabricated substation. Simultaneously, in high summer temperatures, the prefabricated substation... Heat inside the substation can enter the insulation cavity through the air inlet holes on the air inlet base plate, and then dissipate to the outside of the top cover through the convection holes on the side frame. In addition, heat inside the prefabricated substation can also enter the insulation cavity through the air inlet holes, and then enter the groove of the reinforcing purlin through the heat dissipation holes, and then enter the opening of the top cover ridge tile connected to the groove, and finally dissipate to the outside of the top cover through the vent holes of the top cover ridge tile, forming two heat dissipation channels, which further improves heat dissipation efficiency and ensures that the heat inside the prefabricated substation can be quickly dissipated during the high temperature of summer, thereby avoiding the failure of the prefabricated substation in high temperature and low temperature environments, which would affect normal operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of one embodiment of the top cover of this utility model;

[0029] Figure 2 This is a bottom view schematic diagram of the connection structure between the top cover frame and the box body docking panel in one embodiment of the top cover of this utility model.

[0030] Figure 3 This is a front view structural schematic diagram of one embodiment of the prefabricated substation of this utility model;

[0031] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0032] Figure 5 This is a schematic diagram showing the position and structure of the water baffle and water guide channel in one embodiment of the prefabricated substation of this utility model.

[0033] In the diagram: 1. Box-type substation; 2. Side frame; 3. Convection hole; 4. Reinforcing purlin; 5. Support beam; 6. Outer cover plate; 7. Air inlet base plate; 8. Air inlet hole; 9. Insulation cavity; 10. Heat dissipation hole; 11. Top cover ridge tile; 12. Ventilation hole; 13. Support body; 14. Pad block; 15. Gas flow gap; 16. Water baffle; 17. Ventilation space; 18. Sloping section; 19. Vertical section; 20. Eaves section; 21. Water guide channel; 22. Inner top plate. Detailed Implementation

[0034] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0035] The top cover of a prefabricated substation is designed to ensure its stable operation. Existing top covers achieve rain protection through a fully enclosed design, but their heat dissipation space is small, resulting in low heat dissipation efficiency. This makes it difficult to quickly dissipate heat during high summer temperatures and maintain the substation's basic operating temperature during low winter temperatures, potentially leading to malfunctions and operational disruptions. To prevent this, an insulated cavity can be formed inside the top cover to resist both low winter temperatures and high summer temperatures, without compromising the top cover's heat dissipation performance, thus ensuring the normal operation of the prefabricated substation. Based on this inventive concept, this invention proposes a top cover with an insulated cavity capable of insulating against high summer temperatures and resisting low winter temperatures, protecting the normal operation of the prefabricated substation.

[0036] The embodiment of the top cover of this utility model:

[0037] See Figures 1 to 5As a basic embodiment of this utility model, the top cover includes a top cover frame, which includes a side frame 2 for connecting to the prefabricated substation 1. The side frame 2 has convection holes 3. The top cover frame also includes reinforcing purlins 4, with both ends of the reinforcing purlins extending along the length of the side frame 2 and fixed to the side frame 2 via support beams 5. Both ends of the support beams 5 extend along the width of the side frame 2 and are fixed to it. The arrangement of the reinforcing purlins 4 and support beams 5 improves the overall stability of the top cover frame and enhances the connection reliability between the top cover and the prefabricated substation 1 when the top cover frame is connected. An outer cover plate 6 is installed on the top of the substation 1. The sides of the outer cover plate 6 are fixed to the side frame 2 and the reinforcing purlin 4 respectively. The outer cover plate 6 can cover the top frame and prevent rain and snow from entering the top frame. An air inlet base plate 7 is installed on the inner wall of the side frame 2. The air inlet base plate 7 has an air inlet hole 8. The space enclosed by the outer cover plate 6, the reinforcing purlin 4, the side frame 2 and the air inlet base plate 7 constitutes a heat insulation cavity 9. The heat insulation cavity 9 can concentrate the heat generated by the box-type substation 1 in the low temperature of winter, resist the low temperature of the outside, and prevent the box-type substation 1 from malfunctioning due to excessively low internal temperature. It can also insulate against the high temperature of summer and prevent the high temperature from affecting the box-type substation 1. The internal temperature of substation 1; the reinforcing purlin 4 has a U-shaped structure with the groove facing upwards, and its side facade has heat dissipation holes 10. Above the reinforcing purlin 4 is a top cover ridge tile 11, with the reinforcing purlin 4 located inside the top cover ridge tile 11. The top cover ridge tile 11 has an opening communicating with the groove of the reinforcing purlin 4, and its side facade has ventilation holes 12. When the summer temperature is high, the insulation cavity 9 first isolates the external high temperature. Secondly, the heat generated inside the box-type substation 1 can enter the insulation cavity 9 through the air inlet hole 8 on the air inlet bottom plate 7, and then escape to the outside of the top cover through the convection hole 3 on the side frame 2, forming a heat dissipation channel. In addition, the box The heat generated inside the substation 1 can also enter the insulation cavity 9 through the air inlet 8, and then enter the groove of the reinforcing purlin 4 through the heat dissipation hole 10, and then enter the opening of the top cover ridge tile 11 connected to the groove. Finally, it can escape from the vent hole 12 of the top cover ridge tile 11 to the outside of the top cover, forming another heat dissipation channel. The simultaneous heat dissipation of the two heat dissipation channels can further improve the heat dissipation efficiency, ensuring that the high temperature outside will not affect the internal temperature of the substation 1 during the high temperature of summer. At the same time, the heat generated inside the substation 1 can also be dissipated quickly, avoiding the substation 1 from malfunctioning in high temperature and low temperature environments and affecting normal operation.

[0038] In a preferred embodiment of this utility model, multiple support beams 5 are spaced apart along the length of the side frame 2. The support beams 5, the reinforcing purlins 4, and the side frame 2 together constitute the top cover frame. The multiple support beams 5 provide overall support for the top cover frame, ensuring that the stress on each part of the top cover frame is consistent and improving the overall strength and stability of the top cover frame.

[0039] In a preferred embodiment of this invention, the support beam 5 is designed as a triangular beam, which offers high inherent stability. The outer cover plate 6 is positioned on the two inclined surfaces of the triangular beam and is also tilted. This tilted design facilitates the downward flow of rainwater, preventing it from entering the prefabricated substation 1. Furthermore, the outer cover plate 6 is in direct contact with the triangular beam, ensuring stable support and high structural stability. In other embodiments, the support beam 5 can be curved, and the corresponding outer cover plate 6 can also be curved. This design achieves both rainproof performance and support stability, while also improving aesthetics.

[0040] In a preferred embodiment of this utility model, a support body 13 for supporting the ridge tile 11 is provided in the groove of the reinforcing purlin 4. In this embodiment, the support body 13 is a plate, with its upper end extending from the groove of the reinforcing purlin 4 and connecting to the ridge tile 11. The height of the support body 13 is greater than the sum of the heights of the ridge tile 11 and the reinforcing purlin 4, creating a gap between the ridge tile 11 and the outer cover plate 6. A pad 14 is provided within this gap, connecting the ridge tile 11 and the outer cover plate 6. The support body 13 and the pad 14 together support the ridge tile 11, improving the connection stability between the ridge tile 11 and the roof frame. In other embodiments, the support body 13 can also be a rod, as long as it can ensure stable support for the ridge tile 11.

[0041] In a preferred embodiment of this utility model, there is a gap between the side surface of the support body 13 and the side surface of the reinforcing purlin 4. This gap constitutes a gas flow gap 15. When the heat inside the box-type substation 1 enters the groove of the reinforcing purlin 4 from the heat dissipation holes 10 on the side surface of the reinforcing purlin 4, the setting of the gas flow gap 15 can increase its contact area with the air, thereby improving the heat exchange efficiency and making the heat generated by the box-type substation 1 dissipate more quickly.

[0042] In a preferred embodiment of this utility model, an upwardly inclined baffle plate 16 is connected to the side of the outer cover plate 6 near the reinforcing purlin 4. A ventilation space 17 is provided between the baffle plate 16 and the side facade of the top cover ridge tile 11. When the heat in the box-type substation 1 flows into the opening of the top cover ridge tile 11 from the groove of the reinforcing purlin 4, the outside air will enter the top cover ridge tile 11 from the vent hole 12 and form convection with the heat in the top cover ridge tile 11, which further improves the heat dissipation efficiency.

[0043] In a preferred embodiment of this utility model, the baffle plate 16 includes an inclined portion 18, a vertical portion 19, and an eaves portion 20. The two ends of the vertical portion 19 are connected to the inclined portion 18 and the eaves portion 20 respectively, and its side surface is flush with the side surface of the support body 13. The eaves portion 20 extends upward at an angle away from the reinforcing purlin 4. The inclined portion 18 is connected to the outer cover plate 6 and has the same inclination angle as the outer cover plate 6. The inclined portion 18 is located above the gas flow gap 15. The eaves portion 20 can block rainwater entering from the vent holes 12 on the side surface of the roof ridge tile 11. Furthermore, the eaves portion 20 and the inclined portion 18 cooperate to prevent rainwater from entering the reinforcing purlin 4 from the gas flow gap 15, and then flowing into the insulation cavity 9 through the heat dissipation holes 10 on the side surface of the reinforcing purlin 4, and then into the box-type substation 1, causing the box-type substation 1 to malfunction.

[0044] In a preferred embodiment of this utility model, the inclined portion 18, the vertical portion 19, and the eaves portion 20 of the water baffle 16 are integrally bent and formed. This arrangement can prevent rainwater from seeping through the gaps and causing the interior of the box-type substation 1 to become damp.

[0045] In a preferred embodiment of this utility model, the gap between the top cover ridge tile 11 and the outer cover plate 6 forms a water guiding channel 21, through which rainwater blocked by the baffle plate 16 can flow out, thus preventing rainwater from remaining on the top cover.

[0046] In a preferred embodiment of this utility model, the air intake base plate 7 includes multiple inner top plates 22. These inner top plates 22 are interconnected and horizontally laid to form a single layer of the air intake base plate 7. Each inner top plate 22 has several heat dissipation holes 10. The inner top plates 22 can be detachably connected, allowing for separate cleaning of each inner top plate 22 during the cleaning process, saving time. Furthermore, smaller plates are easier to clean than a single large plate. In other embodiments, the inner top plates 22 can also be fixedly connected to form a whole and installed within the side frame 2. This configuration improves the stability and firmness of the top cover, preventing any inner top plate 22 from detaching.

[0047] The top cover of this utility model is used as follows: the top cover is detachably connected to the prefabricated substation 1 via the side frame 2. In winter, when the temperature is low, the heat generated inside the prefabricated substation 1 will accumulate in the insulation cavity 9. The insulation cavity 9 can maintain a high temperature to resist the low temperature outside, ensuring that the prefabricated substation 1 is always within the normal operating temperature range. In summer, when the temperature is high, the insulation cavity 9 can isolate the high temperature outside. At the same time, the heat generated by the prefabricated substation 1 will be dissipated through two heat dissipation channels. One heat dissipation channel is where heat enters the insulation cavity 9 from the air inlet 8 and escapes to the outside through the convection holes 3 on the side frame 2. The other heat dissipation channel is where heat enters the insulation cavity 9 from the air inlet 8, then enters the gas flow gap 15 through the heat dissipation holes 10 of the reinforcing purlin 4, then enters the ventilation space 17 through the gas flow gap 15, and finally escapes to the outside through the vent holes 12 of the top cover ridge tile 11. The two heat dissipation channels can ensure that the heat inside the prefabricated substation 1 is dissipated quickly, ensuring the normal operation of the prefabricated substation 1.

[0048] The implementation method of the prefabricated substation of this utility model:

[0049] See Figures 3 to 5 The prefabricated substation 1 includes the aforementioned top cover, which is detachably connected to the top of the prefabricated substation 1 to form a stable connection. The structure of the top cover here is the same as that of the top cover mentioned above, so it will not be described again. By installing this top cover, the heat dissipation efficiency inside the prefabricated substation 1 can be improved, preventing the prefabricated substation 1 from malfunctioning in high and low temperature environments, and ensuring the normal operation of the prefabricated substation 1.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A roof comprising a roof skeleton comprising side frames for connection with a box-type substation, the side frames being provided with convection openings, characterized in that: The top cover frame also includes reinforcing purlins. The two ends of the reinforcing purlins extend along the length of the side frame and are fixed to the side frame through support beams. The two ends of the support beams extend along the width of the side frame and are fixed to the side frame. An outer cover plate is installed on the support beam. The sides of the outer cover plate are fixed to the side frame and the reinforcing purlins respectively. An air intake base plate is installed on the inner wall of the side frame. The air intake base plate has air intake holes. The space enclosed by the outer cover plate, the reinforcing purlins, the side frame and the air intake base plate constitutes a heat insulation cavity. The reinforcing purlins have a U-shaped structure with the groove facing upward. They have heat dissipation holes on their side facade. A top cover ridge tile is installed above the reinforcing purlins. The reinforcing purlins are located inside the top cover ridge tile. The top cover ridge tile has an opening that communicates with the groove of the reinforcing purlins. It has ventilation holes on its side facade.

2. The cap of claim 1, wherein: Multiple support beams are spaced apart along the length of the side frame, and the support beams, reinforcing purlins, and side frame together form the top cover frame.

3. The cap of claim 2, wherein: The supporting beam is a triangular beam, and the outer cover plate is located on the two inclined surfaces of the triangular beam.

4. The cap of claim 1, wherein: The groove of the reinforcing purlin is provided with a support body for supporting the ridge tile of the roof cover. The upper end of the support body extends out of the groove of the reinforcing purlin and connects with the ridge tile of the roof cover. The height of the support body is greater than the sum of the heights of the ridge tile of the roof cover and the reinforcing purlin, and there is a gap between the ridge tile of the roof cover and the outer cover plate. A pad is provided in the gap, and the pad connects the ridge tile of the roof cover and the outer cover plate.

5. The cap of claim 4, wherein: There is a gap between the side surface of the support body and the side surface of the reinforcing purlin, which constitutes a gas flow gap.

6. The cap of claim 4, wherein: The outer cover plate is connected to an upwardly inclined baffle plate on the side near the reinforcing purlin, and a ventilation space is provided between the baffle plate and the side facade of the roof ridge tile.

7. The cap of claim 6, wherein: The water baffle includes a sloping portion, a vertical portion, and an eaves portion. The two ends of the vertical portion are connected to the sloping portion and the eaves portion respectively, and the side facade is flush with the side facade of the support body. The eaves portion extends upward at an angle away from the reinforcing purlin. The sloping portion is connected to the outer cover plate and has the same inclination angle as the outer cover plate. The sloping portion is located above the gas flow gap.

8. The cap of claim 7, wherein: The sloped portion, vertical portion, and eaves portion of the water baffle are integrally bent into shape.

9. The cap of claim 4, wherein: The gap between the top cover ridge tile and the outer cover plate forms a water guiding channel.

10. A box-type substation, characterized by: Includes the top cover as described in any one of claims 1-9.

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