A substation outdoor cubicle anti-condensation structure and control method

Abstract

This application relates to an anti-condensation structure and control method for outdoor substation cabinets, belonging to the field of outdoor cabinet technology. It includes an inner shell and an outer shell. The top of the inner shell is open and equipped with several inclined baffles, which are staggered. Heating elements are installed inside the baffles. A return air inlet is located at the bottom of the inner shell and connected to a return air fan. A return air gap is formed between the inner shell and the outer shell, and a dehumidification module is installed within the return air gap. This application, through the heating and inclined airflow guidance of the baffles, the temperature difference isolation between the inner and outer shells, and the circulating dehumidification within the return air gap, can preferentially handle top condensation, preventing it from dripping and damaging electrical components. Simultaneously, it achieves gradient utilization of heat energy, offering advantages such as good anti-condensation effect, low energy consumption, and active dehumidification.

Description

Technical Field

[0001] This application relates to the field of substation cabinet technology, and in particular to an anti-condensation structure and control method for outdoor substation cabinets. Background Technology

[0002] A prefabricated substation, also known as a prefabricated transformer substation, is a type of substation where high-voltage switchgear, distribution transformers, and low-voltage distribution equipment are arranged in a specific wiring scheme and installed in a fully enclosed, movable steel structure enclosure. This type of equipment achieves electromechanical integration and fully enclosed operation, making it particularly suitable for urban power grid construction and renovation. It represents a new type of substation that has emerged after civil engineering substations.

[0003] Chinese patent CN119602109A discloses an anti-condensation device for outdoor substation cabinets, comprising: a frame fixedly installed on the bottom side of the substation cabinet to help keep the cabinet away from the ground and reduce the entry of humid air into the cabinet's interior; and temperature-regulating pipes surrounding the outer wall of the cabinet for temperature control. The temperature-regulating pipes circulate clean water to transfer and absorb heat by circulating water at different temperatures, thereby regulating the cabinet's temperature. By synchronously cooling or heating the circulating water with changes in external temperature, the external temperature and the cabinet's temperature become increasingly similar, controlling the temperature at the critical point for condensation and achieving temperature control and anti-condensation of the substation cabinet.

[0004] The aforementioned technologies have the following drawbacks: their temperature control tubes need to run continuously to maintain the temperature control of the entire cabinet, but in reality, even if condensation occurs in the cabinet, the condensation hazard is mainly on the top of the inner wall of the cabinet. If the condensation on the top of the inner wall of the cabinet drips onto electrical components, it will be more likely to cause hazards. Therefore, the aforementioned technologies have the problem of high energy consumption, and they are more suitable for prevention and control. When condensation already exists inside the cabinet, they cannot effectively eliminate condensation. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an anti-condensation structure and control method for outdoor cabinets in substations.

[0006] The technical solution provided in this application for an anti-condensation structure and control method for outdoor cabinets in substations is as follows: An anti-condensation structure for an outdoor cabinet in a substation includes an inner shell and an outer shell. The top of the inner shell is open and has several inclined baffles. Adjacent baffles are staggered. A heating element is installed inside each baffle. A return air inlet is provided at the bottom of the inner shell and connected to a return air fan. A return air gap is formed between the inner shell and the outer shell, and a dehumidification module is installed in the return air gap.

[0007] By adopting the above technical solution, under normal conditions, the heating element can be set to a low-power mode as needed to heat the baffles, and condensation is less likely to form at the bottom of the heated baffles. Furthermore, the overall casing is doubly isolated by the inner and outer shells, resulting in a lower temperature difference between the top of the inner shell and the return air gap. Therefore, the baffles at the top of the inner shell are less prone to condensation. Even if condensation does form at the bottom of the baffles, it will be guided along the inclined baffles to the side wall of the inner shell, reducing the probability of it dripping directly down to the center of the top of the inner shell, thus better protecting the electrical components located at the center of the inner shell. When it is necessary to eliminate existing condensation, the heating element can be adjusted to a high-power mode and the return air fan turned on. In this state, the baffle temperature is higher, which facilitates the evaporation of condensation generated at the baffle. As the humid, hot air enters the return air gap and returns to the return air vent under the action of the return air fan, it passes through the dehumidification module to dehumidify the air mixed with moisture. The dehumidified air then continues to flow back into the inner casing, drying any condensation on the inner wall, thus achieving condensation treatment. Furthermore, this application prioritizes the treatment of top condensation, immediately reducing the damage to electronic components from top condensation dripping. The humid, hot air flowing through the return air gap also heats the outer wall of the inner casing through heat exchange. Finally, the airflow returning to the inner casing has been processed by the dehumidification module, achieving gradient utilization of heat energy, saving overall energy consumption, and increasing utilization efficiency.

[0008] Furthermore, an extension strip is provided on the side wall of the section of the baffle that extends above the adjacent baffle, and the extension strip is located above the adjacent baffle.

[0009] By adopting the above technical solution, the extension strip expands the heating area, which can more effectively heat and cover the vertical gap between adjacent baffles, further increasing the air temperature in the area and preventing condensation.

[0010] Furthermore, the top wall of the baffle is provided with a flow guide groove.

[0011] By adopting the above technical solution, the flow guide channel further increases the heat exchange area between the baffle and the air, thereby improving the heating efficiency. At the same time, if condensation drips from the top wall of the outer casing, the flow guide channel can collect this condensation and guide it to the side wall of the inner casing, preventing it from dripping directly onto the electrical components.

[0012] Furthermore, the inner wall of the inner shell is provided with a water-absorbing baffle ring. The inner side of the water-absorbing baffle ring is inclined upward and the top wall of the water-absorbing baffle ring and the inner wall of the inner shell form a water-retaining ring groove. The water-retaining ring groove is located below the connection between the baffle and the inner shell.

[0013] By adopting the above technical solution, the water-absorbing baffle ring can not only gather wind and guide airflow, but also use its water-absorbing material properties to absorb condensation dripping from the baffle or inner shell side wall and temporarily store it in the water storage ring groove, waiting for subsequent natural air drying or being carried away by the circulating airflow, further preventing condensation from accumulating and dripping.

[0014] Furthermore, the dehumidification module includes a moisture-absorbing sponge that blocks the return air gap circumferentially, and a dehumidification drive is connected between the inner shell and the outer shell.

[0015] By adopting the above technical solution, the circulating airflow can absorb moisture from the air as it passes over the absorbent sponge, reducing humidity. When the absorbent sponge accumulates water to a certain level, the dehumidification drive can be used to reduce the distance between the inner shell and the outer shell on one side, thereby squeezing the absorbent sponge at that specific location. This reduces the humidity and water accumulation of the absorbent sponge, achieving automatic regeneration and extending the maintenance cycle.

[0016] Furthermore, the inner shell is connected to a lower cover plate, and a sinking chamber is provided circumferentially at the bottom of the outer shell. The sinking chamber is provided with a drain outlet, and the lower cover plate covers the drain outlet.

[0017] By adopting the above technical solution, under normal conditions, the lower cover plate seals the drain outlet, maintaining the overall seal of the cabinet. When the dehumidification drive squeezes the water-absorbing sponge at a certain location, the lower cover plate at the corresponding location moves away from the drain outlet, allowing the water squeezed out of the sponge to be discharged directly from the drain outlet into the cabinet. After the dehumidification drive resets, the lower cover plate automatically covers the drain outlet, restoring the sealed state.

[0018] Furthermore, the top of the inner shell is provided with a top cover plate, and the top of the outer shell is provided with a vent. The top cover plate covers the bottom opening of the vent.

[0019] By adopting the above technical solution, under normal conditions, the top cover seals the vent, keeping the cabinet airtight. When the dehumidification drive squeezes the absorbent sponge, the top cover moves away from below the vent, allowing the hot and humid air inside the cabinet to automatically escape from the vent, achieving bottom drainage and top dehumidification, thus accelerating moisture removal.

[0020] Furthermore, the bottom wall of the inner shell is provided with a drying port on the side of the return air inlet. The drying port passes through the side wall of the inner shell via a drying pipe and connects to the return air gap. The return air fan is connected to the outer shell.

[0021] By adopting the above technical solution, when the absorbent sponge on one side needs dehumidification, the dehumidification drive causes one side of the absorbent sponge to be compressed, blocking the return air gap, while the gap on the other side widens. At this time, the return air fan can blow air from the drying port through the drying duct to the absorbent sponge with the widened gap, thus drying the absorbent sponge. This process does not actively introduce moisture into the inner shell, reducing the impact of humidity inside the inner shell. Combined with the opening and closing of the drain and dehumidification ports, external air can be used for air-drying the absorbent sponge through circulation, improving regeneration efficiency.

[0022] Furthermore, a transparent cover is provided at the bottom of the outer shell. The transparent cover is an inverted funnel-shaped structure. Several inclined heat-absorbing strips are provided inside the transparent cover. The heat-absorbing strips are divided into several groups. Each group of heat-absorbing strips forms an inverted or upright funnel-shaped structure. The funnel-shaped structures are nested together and connected at their ends. The placement directions of adjacent funnel-shaped structures inside and outside are opposite.

[0023] By employing the above technical solution, the transparent cover absorbs solar energy to heat the heat-absorbing strips inside. The outermost funnel-shaped structure adheres to the transparent cover, absorbing heat and transferring it sequentially to the inner heat-absorbing strips through heat conduction. When air needs to be drawn from the bottom of the cabinet for drying or replenishment, the air passes through these heated heat-absorbing strips for heat exchange, achieving preheating and reducing the risk of condensation caused by cold air entering the cabinet. Simultaneously, the inclined heat-absorbing strips also act as a guide during drainage, reducing water splashing.

[0024] In summary, this application includes at least one of the following beneficial effects: 1. By setting up an inclined baffle with heating elements, an inner and outer double shell, and a return air circulation dehumidification system, the top condensation is preferentially treated and eliminated to prevent it from dripping and damaging electrical components. At the same time, the gradient utilization of heat energy is realized, which significantly reduces energy consumption.

[0025] 2. By setting extension strips and guide channels, the heating and flow guiding effects of the baffle are enhanced, further improving the anti-condensation capability.

[0026] 3. By incorporating regenerable absorbent sponges, automatically opening and closing drain and dehumidification outlets, and air drying pipes, the dehumidification module achieves automatic regeneration and effective moisture removal, ensuring the long-term effectiveness and reliability of the dehumidification system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of this application; Figure 2 This is a structural schematic diagram illustrating the connection relationship between the baffle and the extension strip in an embodiment of this application; Figure 3 This is a structural schematic diagram illustrating the positional relationship between adjacent baffles in an embodiment of this application; Figure 4 This is a schematic diagram illustrating the connection relationship between the water-absorbing baffle ring and the inner shell in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the airflow direction of the right-side absorbent sponge under compressed conditions in an embodiment of this application; Figure 6 This is a schematic diagram illustrating the airflow direction of the left-side absorbent sponge under compressed conditions in an embodiment of this application; Figure 7 This is a schematic diagram illustrating the airflow direction of the absorbent sponge in an uncompressed state, as shown in the embodiments of this application.

[0028] In the diagram: 1. Inner shell; 11. Baffle; 111. Heating element; 112. Extension strip; 113. Guide channel; 12. Return air inlet; 13. Water absorption baffle ring; 131. Water storage ring groove; 14. Air drying inlet; 15. Air drying pipe; 2. Outer shell; 21. Lower chamber; 211. Drain outlet; 22. Dehumidification outlet; 3. Return air fan; 4. Return air gap; 5. Dehumidification module; 51. Moisture-absorbing sponge; 6. Dehumidification drive; 7. Lower cover plate; 8. Upper cover plate; 9. Transparent cover; 91. Heat absorption strip. Detailed Implementation

[0029] This application discloses an anti-condensation structure and control method for outdoor cabinets in substations. (Refer to...) Figure 1 An anti-condensation structure for an outdoor substation cabinet includes an inner shell 1 and an outer shell 2. The inner shell 1 houses electrical components and has an opening at its top with several inclined baffles 11. Adjacent baffles 11 are staggered to form a labyrinthine structure, which allows for ventilation while effectively blocking external debris. Heating elements 111 are embedded inside the baffles 11 for heating them. A return air vent 12 is opened at the bottom of the inner shell 1 and connected to a return air fan 3. There is a certain gap between the inner shell 1 and the outer shell 2, forming a return air gap 4, within which a dehumidification module 5 is installed. Under normal conditions, the heating elements 111 can be set to a low-power mode as needed, only moderately heating the baffles 11. The surface temperature of the heated baffles 11 is higher than the dew point temperature inside the inner shell 1, thereby effectively suppressing condensation at the bottom of the baffles 11. Furthermore, the double isolation structure formed by the inner shell 1 and the outer shell 2 significantly reduces the temperature difference between the top of the inner shell 1 and the return air gap 4, further reducing the possibility of condensation on the top of the inner shell 1. Even if a small amount of condensation occurs at the bottom of the baffle 11 due to extreme operating conditions, the condensation will flow along the inclined baffle 11 to the side wall of the inner shell 1 under the action of gravity, instead of dripping directly from the center of the top of the inner shell 1, thereby maximizing the protection of the core electrical components located at the center of the inner shell 1.

[0030] Reference Figure 2 and Figure 3To further optimize the anti-condensation effect, an extension strip 112 is provided on the side wall of the section of the baffle 11 that extends above the adjacent baffle 11. This extension strip 112 extends horizontally above the adjacent baffle 11. When the heating element 111 is working, the extension strip 112 expands the heating area, effectively covering and heating the vertical gap between the adjacent baffles 11, thus raising the air temperature in this critical area and eliminating dead zones for condensation formation. A crisscrossing guide groove 113 is also provided on the top wall of the baffle 11. The guide groove 113 not only increases the heat exchange area between the baffle 11 and the air, improving heating efficiency, but also, in unexpected situations (such as when condensation drips from the inner top wall of the outer casing 2), collects the condensation and guides it to the side wall of the inner casing 1, preventing the condensation from dripping directly onto the electrical components below.

[0031] Reference Figure 1 and Figure 4 A water-absorbing baffle ring 13 is fixed to the inner wall of the inner shell 1, below the connection between the baffle 11 and the inner shell 1. The water-absorbing baffle ring 13 is made of water-absorbing material (such as water-absorbing sponge or fiber felt), and its inner side is inclined upward, so that the top wall of the water-absorbing baffle ring 13 and the inner wall of the inner shell 1 together form a water-collecting ring groove 131. When working, this structure can effectively gather air and guide the airflow direction. At the same time, the condensation flowing down from the baffle 11 or the side wall of the inner shell 1 can be actively absorbed by the water-absorbing baffle ring 13 and temporarily stored in the water-collecting ring groove 131 to prevent it from continuing to flow downward. It will then naturally dry or be carried away in the subsequent circulating airflow, playing a multiple protective role.

[0032] Reference Figure 1 The dehumidification module 5 includes several block-shaped moisture-absorbing sponges 51. For example, if the picture frame has a square structure, four sponges are preferred. The moisture-absorbing sponges 51 fill the return air gap 4 and seal the gap circumferentially, so that the air flowing through the return air gap 4 must pass through the moisture-absorbing sponges 51. Multiple dehumidification drives 6 (such as electric push rods or cam mechanisms) are connected between the inner shell 1 and the outer shell 2. In active decondensation mode, the return air fan 3 starts, drawing the humid and hot air from the top of the inner shell 1 into the return air gap 4. When the airflow passes through the moisture-absorbing sponges 51, the water vapor in it is efficiently adsorbed. The dried air returns to the interior of the inner shell 1 from the return air port 12 to dry the inner wall. This process achieves gradient utilization of heat energy: when the humid and hot air flows through the return air gap 4, it first exchanges heat with the outer wall of the inner shell 1, which plays a certain role in heating, then it is dehumidified by the moisture-absorbing sponges 51, and finally it flows back, resulting in higher energy utilization.

[0033] Reference Figure 5 and Figure 6Multiple lower cover plates 7 are movably connected to the bottom edge of the inner shell 1, and the lower cover plates 7 are linked to the operation of the dehumidification drive 6. A corresponding recessed chamber 21 is provided at the bottom of the outer shell 2, and a drain outlet 211 is opened at the bottom of the recessed chamber 21. Normally, the lower cover plates 7 cover the drain outlet 211. When the dehumidification drive 6 squeezes the moisture-absorbing sponge 51 on one side, it will pull open the lower cover plates 7, allowing the squeezed water to drain out from the drain outlet 211. Similarly, an upper cover plate 8 is connected to the top of the inner shell 1 via a support rod, and a corresponding vent 22 is provided at the top of the outer shell 2. Normally, the upper cover plate 8 covers the bottom opening of the vent 22. When squeezing to drain water, the upper cover plate 8 is also opened, allowing hot and humid air to drain out from the vent 22.

[0034] When the absorbent sponge 51 becomes saturated, the system enters regeneration mode. The dehumidification drive 6 is activated, causing relative displacement between the inner shell 1 and the outer shell 2, compressing the absorbent sponge 51 on one side. To facilitate drainage, multiple lower cover plates 7 are movably connected to the bottom edge of the inner shell 1, and a corresponding recessed chamber 21 is located at the bottom of the outer shell 2, with a drain outlet 211 at its bottom. Normally, the lower cover plates 7 cover the drain outlet 211, maintaining a sealed enclosure. During compression, the linkage mechanism opens the corresponding lower cover plate 7 on that side, allowing the squeezed-out water to drain directly from the drain outlet 211. Simultaneously, refer to... Figure 1 The top of the inner shell 1 is movably connected to a top cover plate 8, and a corresponding vent 22 is provided on the top of the outer shell 2. Under normal conditions, the top cover plate 8 covers the bottom opening of the vent 22. When the water is squeezed out, the top cover plate 8 is also opened in conjunction, allowing the heated and humid air inside to be naturally discharged from the vent 22, realizing a highly efficient regeneration process of "bottom drainage and top dehumidification".

[0035] Reference Figure 5 and Figure 6 To further improve regeneration efficiency, a drying port 14 is provided on the bottom wall of the inner shell 1, located to the side of the return air inlet 12. This drying port 14 is connected to a specific location in the return air gap 4 via a drying pipe 15 passing through the side wall of the inner shell 1. The casing of the return air fan 3 is connected to the outer shell 2. When the dehumidification drive 6 squeezes the moisture-absorbing sponge 51 on one side, the sponge on that side is compressed and blocks the return air gap, while the gap on the other side widens due to the offset of the inner shell 1. At this time, the return air fan 3 switches the airflow path, blowing external air from the drying port 14 through the drying pipe 15 onto the moisture-absorbing sponge 51 with the widened gap, forcibly drying the sponge 51. During this process, the moisture generated during drying does not enter the interior of the inner shell 1, but is discharged through the drain port 211 or the exhaust port 22 on the other side, minimizing the impact on internal components and achieving a highly efficient and non-interfering regeneration cycle.

[0036] Reference Figure 1At the bottom of the outer casing 2, a transparent cover 9, made of materials such as glass or transparent plastic, is installed. The transparent cover 9 is an inverted funnel-shaped structure (larger at the bottom and smaller at the top). Its internal space contains multiple sets of inclined heat-absorbing strips 91, made of materials with good thermal conductivity (such as aluminum or copper). These heat-absorbing strips 91 are divided into several groups, each forming an inverted or upright funnel-shaped structure. Multiple funnel-shaped structures are nested together and connected at their ends. Adjacent funnel-shaped structures are placed in opposite directions, forming a multi-layered heat-absorbing structure resembling a "maze." The outermost funnel-shaped structure is in contact with the transparent cover 9, efficiently absorbing solar energy and converting it into heat energy, which is then transferred sequentially to the inner heat-absorbing strips 91 through heat conduction. When air needs to be drawn from the bottom of the cabinet for drying or replenishment, external air first enters the transparent cover 9, undergoing sufficient heat exchange with the heated heat-absorbing strips 91 to achieve preheating and effectively prevent cold air from directly entering the cabinet and causing new condensation problems. At the same time, these inclined heat-absorbing strips 91 also play a good guiding role when draining water, guiding the water flow to quickly flow into the sink 21 and reducing water splashing.

[0037] The implementation principle of the anti-condensation structure for an outdoor enclosure in a substation according to this application is as follows: In the normal anti-condensation mode, the heating element 111 operates at low power, heating the baffle 11 and the extension strip 112, making their temperature slightly higher than the ambient dew point, thus preventing condensation from forming at the top. At the same time, the double-layer shell structure reduces the temperature gradient between the top of the inner shell 1 and the return air gap 4, further suppressing condensation.

[0038] When the internal humidity is high or condensation has occurred, the system enters active decondensation mode. The heating element 111 switches to high power to quickly evaporate the condensation on the baffle 11. At the same time, the return air fan 3 starts, drawing the hot and humid air from the top into the return air gap 4. As the hot and humid air flows through the return air gap 4, it must pass through the moisture-absorbing sponge 51. The moisture is absorbed by the sponge, and the dried air returns to the inner casing 1 from the return air vent 12 to dry the inner wall, completing one dehumidification cycle.

[0039] As the moisture-absorbing sponge 51 absorbs more moisture, its dehumidification efficiency decreases. At this point, the system enters the dehumidification module regeneration mode. The dehumidification drive 6 is activated, causing relative displacement between the inner shell 1 and the outer shell 2, squeezing the moisture-absorbing sponge 51 on one side. Simultaneously, the linkage mechanism opens the corresponding lower cover 7 and upper cover 8 on that side. The squeezed-out water is drained away from the drain outlet 211, while the heated and humid air is discharged from the top exhaust outlet 22. At the same time, the return air fan 3 switches the airflow path, blowing external air (preheated by the transparent cover 9) or internal air from the drying outlet 14 through the drying pipe 15 onto the unsqueezed moisture-absorbing sponge 51 on the other side, drying it and accelerating its recovery of moisture absorption capacity. Throughout the process, the interior of the inner shell 1 maintains a low humidity, effectively preventing condensation from damaging electrical components.

[0040] This application also provides a control method based on the above-mentioned anti-condensation structure of outdoor cabinets in substations, the method comprising the following steps: S1: Environmental Parameter Detection and Mode Determination Temperature and humidity sensors inside the inner casing 1 collect real-time environmental data from inside the cabinet and transmit the data to the controller. The controller determines the required operating mode based on preset thresholds. If the humidity inside the cabinet is lower than the first preset threshold (e.g., RH≤65%) and there is no condensation alarm signal, it will enter the daily anti-condensation mode. If the humidity inside the cabinet is higher than the second preset threshold (e.g., RH≥80%), or if condensation is detected, the active decondensation mode will be activated. If the cumulative working time of the moisture-absorbing sponge 51 reaches the preset cycle, or if the humidity sensor at the moisture-absorbing sponge 51 detects that its humidity is higher than the regeneration threshold, then the dehumidification module will enter the regeneration mode.

[0041] S2: Daily Anti-condensation Mode The controller controls the heating element 111 to operate in a low-power mode (e.g., 20%-30% of rated power) to continuously heat the baffle 11, making the surface temperature of the baffle 11 2-5°C higher than the dew point temperature inside the cabinet. At this time, the return air fan 3 is in standby mode, and both the lower cover 7 and the upper cover 8 remain closed. This mode consumes less energy and effectively suppresses condensation by prioritizing heating the top area, which is prone to condensation, combined with the temperature difference isolation between the inner and outer shells.

[0042] S3: Active decondensation mode When the conditions for active decondensation are met, the controller performs the following operations: Switch the heating element 111 to a high-power mode (e.g., 80%-100% of the rated power) to quickly increase the temperature of the baffle 11 and the extension strip 112, so that the condensation that has been generated evaporates quickly; Start the return air fan 3. The air outlet of the return air fan 3 is connected to the return air inlet 12 to form an internal circulation airflow path: hot and humid air is drawn into the return air gap 4 from the top of the inner shell 1. When it flows through the moisture-absorbing sponge 51, the moisture is absorbed. The dried air returns to the inside of the inner shell 1 from the return air inlet 12 to dry the inner wall. When the humidity inside the cabinet drops below the first preset threshold (e.g., RH≤60%) and the continuous running time reaches the set duration, the system automatically switches back to the daily anti-condensation mode.

[0043] In this mode, top condensation is treated first to prevent it from dripping and damaging electrical components. At the same time, heat energy is utilized in a gradient manner through return air circulation, which significantly reduces energy consumption compared to traditional overall heating methods.

[0044] S4: Dehumidifier module regeneration mode When the absorbent sponge 51 needs to be regenerated, the controller performs the following operations according to a preset strategy: S41: One-way squeeze drainage The controller controls a set of dehumidification drives 6 (e.g., the dehumidification drive on the left) to move the inner housing 1 relative to the outer housing 2 to that side, compressing the moisture-absorbing sponge 51 on that side and squeezing out the absorbed moisture. At the same time, the linkage mechanism opens the corresponding lower cover 7 and upper cover 8 on that side. The squeezed-out moisture is discharged from the drain outlet 211, and the heated humid air is naturally discharged from the vent outlet 22.

[0045] S42: Reverse air drying During or after the squeezing and draining process, the controller controls the return air fan 3 to switch the airflow path, connecting its outlet with the drying outlet 14. The return air fan 3 blows outside air (or air preheated by the transparent cover 9) from the drying outlet 14 through the drying pipe 15 to the unsqueezed absorbent sponge 51 on the other side, forcibly drying the absorbent sponge 51. The moisture generated during drying is discharged from the drain outlet 211 or the dehumidification outlet 22 on the squeezed side.

[0046] S43: Reset and Alternating Regeneration After draining the moisture-absorbing sponge 51 on one side and drying the other side, the controller controls the dehumidification drive 6 to reset, and the lower cover 7 and upper cover 8 close accordingly, restoring the cabinet seal. If it is necessary to regenerate the moisture-absorbing sponge 51 on the other side, the controller controls another set of dehumidification drives 6 to repeat the above steps S41 to S43, so as to realize the alternating regeneration of the moisture-absorbing sponges 51 on both sides.

[0047] S5: Preheating and Gas Injection Mode When the external ambient temperature is low and air replenishment is required, the controller can control the return air fan 3 to introduce external air from the transparent cover 9. As the air flows through the inside of the transparent cover 9, it exchanges heat with the heat absorption strip 91 to achieve preheating before entering the cabinet, effectively preventing cold air from directly entering and causing condensation.

[0048] The implementation principle of the anti-condensation structure and control method for an outdoor cabinet in a substation according to this application is as follows: Sensors monitor the internal environment of the cabinet in real time, and the controller automatically judges and switches between three operating modes based on preset thresholds. In normal mode, low-power heating of the top baffle, combined with temperature difference isolation between the inner and outer shells, prioritizes suppressing condensation formation on the top. In active decondensation mode, high-power heating and return air circulation work together to quickly eliminate existing condensation and achieve gradient utilization of heat energy. In regeneration mode, online regeneration of the absorbent sponge is achieved through dehumidification-driven squeezing drainage, linkage opening and closing of drainage and dehumidification outlets, and forced drying of the air drying outlet, ensuring the continuous high efficiency of the dehumidification module. The entire system, through intelligent control, achieves fully automatic closed-loop management of anti-condensation, decondensation, and dehumidification module regeneration, featuring high efficiency, energy saving, and reliability.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A condensation prevention structure for outdoor cabinets in substations, characterized in that: The device includes an inner shell (1) and an outer shell (2). The top of the inner shell (1) is open and is provided with several inclined baffles (11). The adjacent baffles (11) are staggered. A heating element (111) is provided inside the baffle (11). The bottom of the inner shell (1) is provided with a return air inlet (12) and connected to a return air fan (3). A return air gap (4) is formed between the inner shell (1) and the outer shell (2). A dehumidification module (5) is provided in the return air gap (4).

2. The anti-condensation structure for outdoor cabinets in a substation according to claim 1, characterized in that: An extension strip (112) is provided on the side wall of the section of the baffle (11) that is higher than the adjacent baffle (11), and the extension strip (112) is located above the adjacent baffle (11).

3. The anti-condensation structure for outdoor cabinets in a substation according to claim 2, characterized in that: The top wall of the baffle (11) is provided with a flow guide groove (113).

4. The anti-condensation structure for outdoor cabinets in a substation according to claim 3, characterized in that: The inner wall of the inner shell (1) is provided with a water-absorbing baffle ring (13). The inner side of the water-absorbing baffle ring (13) is inclined upward and the top wall of the water-absorbing baffle ring (13) and the inner wall of the inner shell (1) form a water-storing ring groove (131). The water-storing ring groove (131) is located below the connection between the baffle (11) and the inner shell (1).

5. The anti-condensation structure for outdoor cabinets in a substation according to claim 1, characterized in that: The dehumidification module (5) includes a moisture-absorbing sponge (51), which blocks the return air gap (4) circumferentially, and a dehumidification drive (6) is connected between the inner shell (1) and the outer shell (2).

6. The anti-condensation structure for outdoor cabinets in a substation according to claim 5, characterized in that: The inner shell (1) is connected to a lower cover plate (7), and the bottom of the outer shell (2) is provided with a sinking chamber (21) along the circumferential direction. The sinking chamber (21) is provided with a drain outlet (211), and the lower cover plate (7) covers the drain outlet (211).

7. The anti-condensation structure for outdoor cabinets in a substation according to claim 6, characterized in that: The inner shell (1) is provided with a top cover plate (8), and the outer shell (2) is provided with a vent (22) at the top. The top cover plate (8) covers the bottom opening of the vent (22).

8. The anti-condensation structure for outdoor cabinets in a substation according to claim 7, characterized in that: The bottom wall of the inner shell (1) is provided with a drying port (14) on the side of the return air port (12). The drying port (14) passes through the side wall of the inner shell (1) via a drying pipe (15) and connects to the return air gap (4). The return air fan (3) is connected to the outer shell (2).

9. The anti-condensation structure for outdoor cabinets in a substation according to claim 6, characterized in that: The bottom of the outer shell (2) is provided with a transparent cover (9), which is an inverted funnel-shaped structure. Inside the transparent cover (9) are several inclined heat-absorbing strips (91), which are divided into several groups. Each group of heat-absorbing strips (91) forms an inverted or upright funnel-shaped structure. The funnel-shaped structures are nested together and connected at the ends. The placement directions of adjacent funnel-shaped structures inside and outside are opposite.

10. A control method based on the anti-condensation structure of an outdoor cabinet in a substation according to any one of claims 1-9, characterized in that: Includes the following steps: Daily anti-condensation mode: Control the heating element (111) to operate at a lower power to heat the baffle (11) so that the temperature of the baffle (11) is higher than the dew point temperature; Active decondensation mode: When the internal humidity or condensation exceeds the threshold, the heating element (111) is controlled to switch to higher power operation and the return air fan (3) is started to draw the hot and humid air at the top of the inner shell (1) into the return air gap (4). After being dehumidified by the dehumidification module (5), the dry air returns to the interior of the inner shell (1) from the return air port (12).

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