Box-type substation with internal ventilation circulation structure

Abstract

A box-type substation with an internal ventilation circulation structure comprises a box body, an air inlet used for guiding external air into the box body is formed in the lower portion of the box body, a plurality of air outlets used for exhausting internal air absorbing working heat out of the box body are formed in the upper portion of the box body, and fans are arranged at the air inlet and the air outlets. A mounting base which is assembled with the fan and enables the fan to be mounted on the box body is mounted outside the fan, a dustproof net cover which is used for dedusting air before wind enters the box body is mounted at the air outlet end of the mounting base, and the dustproof net cover is mounted at the air outlet end of the mounting base and is used for assembling and limiting the fan at the same time; and the air outlet end of the dustproof net cover is provided with a dehumidification assembly for drying air before air enters the box body. The device has the beneficial effects that uniform circulation of air in the box body is achieved, and the defect that the local temperature is too high is effectively overcome.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a box-type substation with an internal ventilation and circulation structure. Background Technology

[0002] Prefabricated substations, as a new type of power distribution equipment, have advantages such as small size, small footprint, and convenient installation, and are widely used in residential communities, industrial parks, municipal engineering projects, and other fields. However, during operation, the transformers, circuit breakers, instrument transformers, and other electrical equipment inside the prefabricated substation continuously generate heat, causing the internal temperature of the enclosure to rise. If this heat cannot be dissipated in time, the internal temperature will become too high, which will not only affect the operational stability and service life of the electrical equipment, but may also cause equipment failure, resulting in power outages and disrupting normal production and daily life.

[0003] Currently, most existing prefabricated substations use ventilation holes on the side walls of the enclosure to achieve air circulation and heat dissipation through natural ventilation. This method is greatly affected by the external environment; when the outside wind is weak or the ambient temperature is high, the ventilation and heat dissipation effect is poor, and it cannot effectively reduce the temperature inside the enclosure. Some prefabricated substations use forced ventilation with fans, but these fans are mostly fixed installations with limited ventilation range, failing to achieve uniform air circulation inside the enclosure. Local areas may still experience excessively high temperatures, and long-term operation of the fans can easily lead to dust accumulation, affecting ventilation efficiency and equipment heat dissipation, increasing maintenance costs and workload. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art by providing a box-type substation with an internal ventilation and circulation structure to solve the above problems.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: This box-type substation with an internal ventilation circulation structure includes a box body. An air inlet is provided at the bottom of the box body to guide outside air into the box body, and several air outlets are provided at the top to exhaust internal air that has absorbed working heat from the box body. A fan is installed at both the air inlet and the air outlets. A mounting base is installed around the fan, allowing it to be mounted on the box body. A dustproof mesh cover is installed at the air outlet end of the mounting base to remove dust from the air before it enters the box body. The dustproof mesh cover, while installed at the air outlet end of the mounting base, also restricts the assembly of the fan, preventing it from separating from the mounting base. A dehumidifying component is provided at the air outlet end of the dustproof mesh cover to dry the air before it enters the box body.

[0006] Further improvements include a fan consisting of an outer frame, a fan, and a drive motor. The outer frame is used to assemble and connect with the mounting base. The fan is inserted into the drive shaft of the drive motor, and when the drive motor is installed in the center position of the outer frame, the fan is placed inside the outer frame.

[0007] Further improvements include: the outer frame outer wall is composed of multiple first rings of equal diameter; the outer bottom wall is composed of multiple second rings of different diameters; and the inner insertion structure is composed of multiple third rings of different diameters. The multiple first rings are equidistantly distributed along the axial direction. The outer diameters of the multiple second rings gradually expand outward along the radial direction, and the second ring with the largest outer diameter is equal to the diameter of the first ring. The outer diameters of the multiple third rings gradually expand outward along the radial direction and are also equidistantly distributed along the axial direction. The third ring with the smallest outer diameter is engaged with the drive motor. These first rings, second rings, and third rings are connected by several connecting arms equidistantly distributed along the circumferential direction.

[0008] Further improvements include an extension section that extends outward from the first ring but is not connected to it. The end of the extension section has a connecting ear that bends outward at 90°. The connecting ear and the extension section are used as a flexible snap-fit ​​structure when the outer frame is assembled with the mounting base. The snap-fit ​​connection with the mounting base enables pre-assembly. The air outlet end of the mounting base is provided with bolts at positions corresponding to each connecting ear to prevent the fan and the mounting base from separating.

[0009] Further improvements include a dehumidification component comprising a moisture-absorbing layer, a first ventilation layer, a noise-reducing layer, and a second ventilation layer. The first ventilation layer has a converging portion protruding from its end face near the fan. The converging portion extends along the edge of the first ventilation layer, and the extended converging portions are connected end to end to form a flow-blocking structure on the end face of the first ventilation layer to prevent gas falling on the converging portion from flowing outward. The moisture-absorbing layer is placed inside the flow-blocking structure, and a waterproof sticker is also provided on the end face of the moisture-absorbing layer near the end face of the first ventilation layer.

[0010] Further improvements include a pressure cap within the flow-blocking structure that prevents the moisture-absorbing layer from detaching when placed inside. The pressure cap has a hollow center, forming four borders that connect end to end to create a rectangular frame. A guide slope defining the gas flow direction is formed between the inner and lower surfaces of the borders. A locking node is located at the center of the lower surface of each border. A locking unit is located at the center of the outer surface of the moisture-absorbing layer, which engages with the locking node to maintain the assembled state of the moisture-absorbing layer and the pressure cap. The locking unit has a preset shape and can retract when squeezed, and it can spring back to the preset shape when engaged with the locking node.

[0011] Further improvements include a receiving opening formed on the lower end face of the frame, an insertion port formed within the receiving opening, a spring-back space defined within the insertion port, and a guide channel that communicates with and guides the receiving opening 71. The receiving opening is used to conceal the locking unit when it is combined with the locking node. The insertion port is used to combine with the locking unit and, after combination, allows the locking unit to spring back to a preset shape through the spring-back space. The guide channel is used to assist in controlling the compression of the locking unit.

[0012] Further improvements include a locking unit comprising a protrusion, a pre-shaped elastic part, and a pressing block. The protrusion is fixed at the center of the outer side of the moisture-absorbing layer and is concealed within the receiving opening when the locking unit and the locking node are combined. The elastic part is a sheet-like component that is bent into two parts. One part is fixed on the protrusion, and the other part is supported on the inner side of the insertion port. The pressing block is fixed on the other part of the elastic part that is supported on the inner side of the insertion port and is also placed within the guide channel.

[0013] Further improvements include a first ventilation layer adhesive groove recessed on the end face of the first ventilation layer facing the noise reduction layer, a noise reduction layer sol groove recessed on the end face of the noise reduction layer facing the first and second ventilation layers, and a second ventilation layer adhesive groove recessed on the end face of the second ventilation layer facing the noise reduction layer. The first ventilation layer adhesive groove and the noise reduction layer adhesive groove are staggered in the horizontal direction, and the second ventilation layer adhesive groove and the noise reduction layer adhesive groove are staggered in the horizontal direction. The end face of the first ventilation layer facing the noise reduction layer has a support portion that protrudes upward through the noise reduction layer and abuts against the second ventilation layer.

[0014] Further improvements include a control system, which includes a human-machine interaction module, a logic control module, a regulation module, and a signal acquisition module. The human-machine interaction module is electrically connected to the logic control module, the logic control module is electrically connected to the regulation module and the signal acquisition module, the regulation module is electrically connected to the air intake fan and the air outlet fan, and the signal acquisition module is electrically connected to the temperature sensor installed inside the enclosure. The human-machine interface module is used to set temperature parameters and display equipment status. The set parameters include target temperature value, temperature hysteresis value, and manual / automatic mode selection. The displayed content includes real-time temperature, fan operating status, and alarm information. The signal acquisition module is used to acquire the temperature signal fed back by the temperature sensor in real time and transmit the signal to the logic control module; The logic control module includes a temperature comparison unit and an instruction generation unit. The temperature comparison unit continuously compares the real-time temperature fed back by the signal acquisition module with a preset temperature threshold. The threshold is calculated from the target temperature and hysteresis. When the real-time temperature is higher than the upper threshold, it is determined that cooling is required. When the real-time temperature is lower than the lower threshold, it is determined that the temperature has reached the target. The instruction generation unit generates corresponding control instruction combinations based on the current determination results: when cooling is required, it generates instructions to start the air intake fan and the air outlet fan; when the temperature reaches the target, it generates instructions to stop the air intake fan and the air outlet fan; when in manual mode, it directly generates corresponding start / stop instructions based on the manual instructions input by the human-machine interaction module. The control module directly receives and executes the control commands issued by the logic control module. It includes a first drive unit and a second drive unit. The first drive unit is electrically connected to the contactor of the air intake fan and is used to control the start and stop of the air intake fan. The second drive unit is electrically connected to the contactor of the air outlet fan and is used to control the start and stop of the air outlet fan. The two drive units can operate independently or in coordination to realize the synchronous start and stop of the two types of fans or start and stop them in a preset sequence.

[0015] The beneficial effects of this invention are: 1. This invention adopts a ventilation layout of "bottom inlet, top outlet, and multiple outlets". An air inlet is set at the bottom of the box and multiple air outlets are set at the top. Following the physical law of the natural rise of hot air, the fans set at the air inlet and the air outlet form a composite airflow driving force that combines forced convection and natural convection. This allows the airflow to penetrate the entire box from bottom to top, forming a "piston-like" overall air replacement. This avoids the ventilation dead zones and local hot spots that are easy to occur in traditional ventilation methods, realizes uniform air circulation in the box, and effectively solves the defect of excessive local temperature. 2. This invention achieves modular connection between the fan and the housing by setting an independent mounting base, eliminating the need for complex operations inside the housing when assembling and disassembling the fan. In particular, the elastic snap-fit ​​structure formed by the extension section and connecting lugs on the outer frame of the fan allows for rapid pre-assembly of the fan and the mounting base. Operators can complete the initial positioning without tools, and then double fixation is achieved by bolt tightening. This "snap-fit ​​pre-assembly + bolt tightening" design not only improves assembly efficiency and ensures the reliability of the connection, but also facilitates quick disassembly for later maintenance. 3. This invention sequentially installs a dustproof mesh cover and a dehumidification component at the air outlet, performing dual treatment of dust removal and drying on the air entering the enclosure from the outside. The dustproof mesh cover effectively filters particulate matter such as dust and willow catkins, preventing impurities from adhering to electrical equipment and ensuring the insulation performance and heat dissipation efficiency of the equipment. The dehumidification component absorbs moisture from the air, preventing humid air from entering the enclosure and causing safety hazards such as condensation and short circuits, greatly optimizing the working environment of the internal electrical equipment and effectively extending the service life of the equipment. 4. The dehumidification component of this invention adopts a multi-layer composite structure design. The flow obstruction structure formed by the confluence part forces the airflow to concentrate and directionally pass through the moisture-absorbing layer, ensuring that all air entering the box must fully flow through the moisture-absorbing material, maximizing the drying capacity of the moisture-absorbing layer, and effectively preventing condensate from penetrating into the first ventilation layer 52, which is used as the second dehumidification structure. The design of the press cover and locking node and locking unit realizes the quick disassembly and assembly and stable fixation of the moisture-absorbing layer. When the moisture-absorbing layer is saturated, maintenance personnel can easily remove it for drying and regeneration or replacement without replacing the entire dehumidification component, reducing the cost of consumable replacement and simplifying maintenance operations. 5. This invention, through the establishment of an intelligent control system including a human-machine interaction module, a logic control module, a regulation module, and a signal acquisition module, realizes automatic monitoring of the internal temperature of the enclosure and intelligent regulation of the fan. Based on the comparison between the real-time temperature and the preset threshold, the system automatically controls the start and stop of the inlet and outlet fans, so that the fans only run when cooling is needed, avoiding energy waste caused by long-term ineffective operation. The temperature hysteresis control mechanism stabilizes the internal temperature of the enclosure near the target value, which not only avoids excessively high temperatures affecting the equipment life, but also prevents excessively low temperatures from causing energy waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the fan of the present invention; Figure 3 This is an exploded structural diagram of the fan of the present invention; Figure 4 This is a schematic diagram of the full cross-sectional structure of the dehumidification component of the present invention; Figure 5 This is an exploded structural diagram of the first ventilation layer and the press-fit cover of the present invention; Figure 6 For the present invention Figure 5 A magnified view of part A in the middle; Figure 7 This is a schematic diagram of the control system of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings: Referring to the attached diagram: This prefabricated substation includes a housing 1. To achieve directional airflow and uniform circulation, an air inlet 11 is provided at the bottom of the housing 1 to guide outside air into the housing 1, while several air outlets 12 are provided at the top of the housing 1 to exhaust internal air that has absorbed working heat from the housing 1. This "bottom in, top out" layout conforms to the physical law of hot air naturally rising. Furthermore, a fan 2 is installed at each air inlet 11 and each air outlet 12. These fans 2 are the power source for forced ventilation, capable of overcoming the influence of the external environment (such as no wind or high temperature), actively driving airflow, and significantly improving the efficiency and reliability of ventilation and heat dissipation. Forced convection and natural convection are aligned in the same direction, and their combined effect greatly enhances the driving force of airflow. This allows the airflow to smoothly flow from the bottom to the top along a predetermined vertical path, preventing short-circuiting or stagnation of airflow inside the enclosure. It effectively guides the airflow from bottom to top through the entire enclosure 1, carrying away the heat generated by the electrical equipment, thereby achieving overall air circulation inside the enclosure 1 and avoiding local overheating. At the same time, the multiple air outlets 12 at the top can evenly discharge the rising and collected hot air from multiple points, avoiding the problems of concentrated wind and uneven airflow caused by a single air outlet 12, and further promoting the uniformity of airflow distribution in the horizontal direction inside the enclosure 1.

[0018] To facilitate the installation, maintenance, and replacement of the fan 2, each fan 2 is equipped with a mounting base 3 that is assembled with it. The mounting base 3 is an independent modular component. One end is firmly connected to the fan 2, and the other end can be easily installed on the reserved structure at the air inlet 11 or air outlet 12 of the housing 1. This makes it easier to disassemble and assemble the fan 2 without complicated operations inside the housing, and makes maintenance more convenient.

[0019] Considering the harsh environment of outdoor substations, a dustproof mesh cover 4 is installed on the air outlet end (i.e., the side closest to the inside of the housing) of the mounting base 3. Before the outside air is drawn in by the fan 2 and sent into the housing 1, or when the outside air enters through the air outlet 12 while the fan 2 is not running, it first passes through the dustproof mesh cover 4. The dustproof mesh cover 4 can effectively filter out particulate matter such as dust and willow catkins in the air, preventing these impurities from entering the housing and adhering to the electrical equipment, thereby ensuring the insulation performance and heat dissipation efficiency of the equipment. A clever design is that while the dustproof mesh cover 4 is installed on the air outlet end of the mounting base 3, its own structure also forms an axial limit for the fan 2, preventing the fan 2 from accidentally coming out of the mounting base 3. This "one-thing-multiple-purpose" design not only reduces the number of parts, but also simplifies the assembly process, allowing the fixing of the fan 2 and the installation of the dustproof mesh to be completed simultaneously.

[0020] To address the safety hazards such as condensation and short circuits that may occur when humid air enters the enclosure in high-humidity environments, a dehumidification component 5 is installed at the air outlet end of the dustproof mesh cover 4 (i.e., the side closest to the inside of the enclosure). Before entering the enclosure 1, the dust-removed air flows through this dehumidification component 5, where the desiccant or moisture-absorbing material absorbs moisture from the air and dries it. Through this dual treatment of dust removal and dehumidification, the air entering the enclosure 1 becomes clean and dry, greatly optimizing the working environment of the internal electrical equipment, effectively extending the service life of the equipment, and reducing the failure rate caused by environmental factors.

[0021] The fan 2 includes an outer frame 21, a fan 22, and a drive motor 23. The outer frame 21 is used to assemble and connect with the mounting base 3. The fan 22 is inserted into the drive shaft of the drive motor 23, and the fan 22 is placed inside the outer frame 21 when the drive motor 23 is installed in the center position. By using the outer frame 21 as an integrated carrier, the fan 22 and the drive motor 23 are integrated into an independent modular unit, making the fan 2 a component that can be disassembled and installed independently. When the fan 2 malfunctions or needs maintenance, maintenance personnel do not need to perform complex disassembly operations inside the housing 1. They can simply remove the entire fan 2 module from the mounting base 3 for repair or replacement, which greatly improves the convenience of on-site maintenance and shortens equipment downtime.

[0022] The outer frame 21 has an outer wall composed of multiple first rings 211 of equal diameter, an outer bottom wall composed of multiple second rings 212 of different diameter, and an inner insertion structure composed of multiple third rings 213 of different diameter. The multiple first rings 211 are equidistantly distributed along the axial direction. The outer diameter of the multiple second rings 212 gradually expands outward along the radial direction, and the second ring 212 with the largest outer diameter is equal to the first ring 211. The outer diameter of the multiple third rings 213 gradually expands outward along the radial direction and is also equidistantly distributed along the axial direction. The third ring 213 with the smallest outer diameter is engaged with the drive motor 23. Several connecting arms 214 equidistantly distributed along the circumferential direction are connected between these first rings 211, second rings 212, and third rings 213. By adopting an open frame structure composed of multiple rings and connecting arms 214, the traditional solid shell design is replaced. While ensuring that the outer frame 21 has sufficient structural strength and deformation resistance, the overall weight is significantly reduced, material costs are lowered, and air intake resistance is reduced when air enters from multiple directions around the outer frame 21. At the same time, the gradually expanding structure of the third ring 213 plays a guiding role, avoiding excessive interference with the airflow, thereby optimizing the overall aerodynamic performance of the fan 2 and improving ventilation efficiency. The third ring 213 with the smallest outer diameter is engaged with the drive motor 23, realizing precise positioning between the drive motor 23 and the outer frame 21. Furthermore, the open frame structure allows more of the outer surface of the drive motor 23 to be exposed to the airflow, and the airflow generated by the rotation of the fan 22 can directly flow over the motor surface for cooling, enhancing the heat dissipation effect of the motor and helping to extend the service life of the drive motor 23.

[0023] To further optimize the assembly efficiency, connection reliability, and maintenance convenience between the fan 2 and the mounting base 3, the part of the connecting arm 214 that connects to the first ring 211 has an extension section 2141 that extends outward but is not connected to the first ring 211. The end of the extension section 2141 has a connecting ear 2142 that bends outward at 90°. The connecting ear 2142 and the extension section 2141 are used as a flexible snap-fit ​​structure when the outer frame 21 is assembled and connected to the mounting base 3, and are pre-assembled with the mounting base 3 by snap-fit ​​connection. The air outlet end of the mounting base 3 is provided with bolts at positions corresponding to each connecting ear 2142 to prevent the fan 2 and the mounting base 3 from separating. During assembly on the production line or on-site installation, operators do not need to use any tools. They simply align the outer frame 21 of the fan 2 with the mounting base 3 and push it in. The extension section 2141 and its end connecting lugs 2142 will temporarily contract due to elastic deformation. After reaching the predetermined position, they will automatically spring back to their original position, forming a snap-fit ​​with the mounting base 3. This snap-fit ​​pre-assembly method greatly simplifies the initial assembly steps and is especially suitable for one-handed operation scenarios in confined spaces. Through snap-fit ​​pre-assembly, the fan 2 can be temporarily and stably held in the correct assembly position with the mounting base 3, and will not fall off or shift due to gravity or accidental contact. This allows operators to free up their hands to perform subsequent bolt tightening operations without additional personnel support, significantly improving the convenience and safety of assembly. At the same time, the extension section 2141 and the connecting lugs 2142 at its ends will also retract due to elastic deformation. The elastic snap-fit ​​structure formed by the lugs 2142 has a certain deformation capacity, which can absorb and compensate for the manufacturing tolerances and assembly deviations between the outer frame 21 and the mounting base 3. This ensures that even with slight dimensional errors, the fan 2 can still be smoothly installed and reliably snapped in, reducing the machining accuracy requirements of the parts and helping to control production costs. The snap-fit ​​pre-assembly provides initial connection and fixation, while the bolts set at the corresponding positions of each lug 2142 provide the final locking guarantee. This dual fixing method of "snap-fit ​​+ bolt" utilizes both the speed and convenience of snap-fit ​​and the stability and reliability of bolt connection. Even under long-term operating vibration environment, the bolts can effectively prevent the snap-fit ​​structure from loosening due to fatigue, ensuring that the fan 2 and the mounting base 3 always maintain a stable connection, avoiding equipment failure or safety hazards caused by connection failure.

[0024] The dehumidification component 5 includes a moisture-absorbing layer 51, a first ventilation layer 52, a noise-reducing layer 53, and a second ventilation layer 54. The first ventilation layer 52 has a converging part 521 protruding from the end face near the fan 2. The converging part 521 extends along the edge of the first ventilation layer 52, and the extended converging part 521 connects end to end to form a flow-blocking structure that prevents the gas falling on the converging part 521 from flowing outward. The moisture-absorbing layer 51 is placed inside the flow-blocking structure, and the moisture-absorbing layer 51 also has a waterproof sticker 55 attached to the end face of the first ventilation layer 52 near the end face of the first ventilation layer 52. The first ventilation layer 52 serves as the air intake guide layer, and its converging part 521 plays an important role in organizing airflow, ensuring that the airflow enters the moisture-absorbing layer 51 evenly and in a concentrated manner. The moisture-absorbing layer 51, as the core functional layer, is specifically responsible for absorbing moisture in the air and can be made of materials with high moisture absorption performance such as silica gel, molecular sieve, or calcium chloride. The noise reduction layer 53 is located in the middle of the airflow channel and is made of porous sound-absorbing materials (such as polyurethane foam, glass wool, etc.). It can effectively absorb the broadband noise generated by the airflow and the mechanical noise transmitted by the operation of the fan 2, significantly reducing noise pollution during the operation of the box-type substation and improving the surrounding environment. The second ventilation layer 54 serves as the air outlet guide layer and is responsible for evenly diffusing the dry air flowing out of the moisture-absorbing layer 51 into the interior of the box 1, avoiding concentrated airflow jets that could impact local equipment, and also helping to distribute the air evenly within the box.

[0025] Furthermore, the flow-blocking structure formed by the confluence section 521 essentially constitutes a groove or cavity for accommodating the moisture-absorbing layer 51. When the airflow blows from the fan 2 towards the dehumidification assembly 5, it first contacts the first ventilation layer 52. Because the confluence section 521 forms a closed boundary along its edges, the airflow cannot diffuse and escape in all directions. Instead, it can only concentrate and directionally pass through the moisture-absorbing layer 51 located inside the flow-blocking structure. This forced airflow path design ensures that all air entering the housing 1 must fully flow through the moisture-absorbing material, avoiding the situation where the airflow bypasses the moisture-absorbing layer. This maximizes the drying capacity of the moisture-absorbing layer 51 and significantly improves the dehumidification efficiency. The moisture-absorbing layer 51 absorbs moisture from the air. After separation, especially in environments with high humidity or large temperature fluctuations, condensation may occur on the end face near the first ventilation layer 52. The waterproof sticker 55 installed on the end face of the moisture-absorbing layer 51 near the first ventilation layer 52 can effectively prevent condensation from penetrating into the first ventilation layer 52, serving as a second dehumidification structure. At the same time, the moisture-absorbing layer 51 is placed in the flow-blocking structure of the first ventilation layer 52 in a detachable manner. When the moisture-absorbing layer 51 is saturated with moisture, maintenance personnel can easily open the dehumidification assembly 5, remove the old moisture-absorbing layer 51 for drying and regeneration, or directly replace it with a new moisture-absorbing layer without replacing the entire dehumidification assembly 5. This modular design reduces the cost of consumable replacement and simplifies maintenance operations.

[0026] The flow-blocking structure also includes a pressure-sealing cover 6 that prevents the moisture-absorbing layer 51 from detaching when placed inside. The pressure-sealing cover 6 has a hollow center, forming four side frames 61 that connect end to end to create a rectangular frame. A guide slope 611 defining the gas flow direction is formed between the inner and lower surfaces of the side frames 61. A locking node 7 is located at the center of the lower surface of each side frame 61. A locking unit 8, which engages with the locking node 7 to maintain the assembled state of the moisture-absorbing layer 51 and the pressure-sealing cover 6, is located at the center of the outer surface of the moisture-absorbing layer 51. The locking unit 8 has a preset shape and is retractable under pressure, springing back to its preset shape when engaged with the locking node 7. The pressure-sealing cover 6 uses a hollow frame structure, ensuring effective pressure on the moisture-absorbing layer 51 while maximizing ventilation area. The four frame edges 61 occupy only the edge areas, with the center completely hollowed out, allowing airflow to pass unimpeded across the entire surface of the moisture-absorbing layer 51. This avoids a decrease in dehumidification efficiency due to obstruction. The pressing cover 6 presses down on the moisture-absorbing layer 51 from above through its four frame edges 61. The locking nodes 7 are located at the center of the lower end face of each frame edge 61, and the locking units 8 are correspondingly located at the center of the outer side of the moisture-absorbing layer 51. This ensures that the moisture-absorbing layer 51 is subjected to uniform fixing force in four directions. This symmetrical layout avoids the moisture-absorbing layer 51 from tilting or getting stuck due to force on one side, ensuring that the moisture-absorbing layer 51 always maintains the correct posture and position within the flow-blocking structure, thus reliably fixing the moisture-absorbing layer 51. Within the flow-blocking structure, this double-fixing method effectively prevents the moisture-absorbing layer 51 from shifting, shaking, or even falling off due to vibration or airflow impact during equipment transportation, installation, or operation, ensuring the stable operation of the dehumidification function. The guide slope 611 on the inner side of the frame 61 forms a smooth transition surface. When the airflow passes through the hollow area of ​​the press cover 6, the slope can guide the airflow to smoothly change direction, avoiding airflow impact and vortex loss caused by right-angle turns. This not only reduces the wind resistance of the entire dehumidification component 5 and reduces the energy consumption of the fan 2, but also allows the airflow to be more evenly distributed to all parts of the moisture-absorbing layer 51, giving full play to the efficiency of the moisture-absorbing material.

[0027] The locking node 7 includes a receiving opening 71 formed on the lower end face of the frame 61, an insertion port 72 formed within the receiving opening 71, a spring-back space 73 defined within the insertion port 72, and a guide channel 74 that communicates with and guides the receiving opening 71. The receiving opening 71 is used to conceal the locking unit 8 when it is combined with the locking node 7. The insertion port 72 is used to combine with the locking unit 8, and after combination, the spring-back space 73 allows the locking unit 8 to spring back to a preset shape. The guide channel is used to assist in controlling the compression of the locking unit. The receiving opening 71, insertion port 72, spring-back space 73, and guide channel 74 can be integrally formed during the molding of the frame 61, without the need for additional parts or subsequent processing, simplifying the manufacturing process, reducing production costs, and ensuring the positional accuracy and fit consistency between the various structures. The receiving opening 71 is formed on the lower end face of the frame 61. Its depth is sufficient to completely accommodate the locking unit 8 when it is combined with the locking node 7, thus concealing the locking unit 8. This design has a dual function: on the one hand, it makes the appearance of the press cover 6 and the moisture-absorbing layer 51 more flat and neat, avoiding interference or snagging that may be caused by the protruding structure; on the other hand, the concealed locking unit 8 is not easily touched by external objects, which may lead to mis-locking and improves the reliability of the connection. The insertion port 72 guides the locking unit 8 into the spring-loaded space 73, which is large enough to accommodate the spring-loaded locking unit 8. After the locking unit 8 passes through the insertion port 72 and enters the spring-loaded space 73, it immediately springs back to the preset shape and is blocked by the edge of the insertion port 72, preventing it from retracting on its own. This ensures that the locking state is stable and reliable and will not loosen due to vibration or slight external force. The guide channel 74 communicates with the receiving port 71 and has a specific guide shape. During disassembly, the guide channel 74 provides a clear insertion path and force direction for the operating tool, allowing the operator to accurately apply pressure to the locking unit 8 to deform and retract it. This guide design greatly improves the smoothness and success rate of the disassembly operation.

[0028] The locking unit 8 includes a protrusion 81, an elastic part 82 with a preset shape, and a pressing block 83. The protrusion 81 is fixed at the center of the outer side of the moisture-absorbing layer 51 and is placed in the receiving opening 71 to achieve concealment when the locking unit 8 and the locking node 7 are combined. The elastic part 82 is a sheet-like component and is bent into two parts. One part is fixed on the protrusion 81 and the other part is supported on the inner side of the insertion opening 72. The pressing block 83 is fixed on the other part of the elastic part 82 supported on the inner side of the insertion opening 72 and is also placed in the guide channel 74. The protrusion 81 is fixed in the center of the outer side of the moisture-absorbing layer 51. Its shape and size are adapted to the receiving opening 71. When the locking unit 8 and the locking node 7 are engaged, the protrusion 81 is precisely embedded in the receiving opening 71, realizing the initial positioning and centering between the moisture-absorbing layer 51 and the pressing cover 6. At the same time, the protrusion 81 is completely hidden inside the receiving opening 71, making the outer surface of the moisture-absorbing layer 51 after being engaged with the pressing cover 6 flat and smooth, avoiding interference or snagging that may be caused by the protruding structure, and improving the overall aesthetics and safety of the product. The elastic part 82 is made of a sheet-like component and is bent into two parts. This structural design gives the elastic part 82 excellent elastic performance. The part fixed on the protrusion 81 serves as a basic support, while the part supported on the inner side of the socket 72 serves as a movable engaging end. When the moisture-absorbing layer 51 is assembled to the pressing cover 6, the movable part of the elastic part 82 is squeezed and undergoes elastic deformation as it passes through the socket 72. After it has fully entered the rebound space 73, it immediately rebounds to the preset shape and engages with the edge of the socket 72. Compared with a simple elastic protrusion, this sheet-like bent structure has a more defined deformation direction and a more stable rebound force, ensuring the reliability and consistency of the engagement. The pressing block 83 is fixed on the movable part of the elastic part 82 and simultaneously placed in the guide channel 74. This design provides a clear point of force application for disassembly. When it is necessary to disassemble the moisture-absorbing layer 51, the operator only needs to insert a tool (such as a screwdriver) through the guide channel 74 or press the pressing block 83 directly with his / her finger to deform and retract the movable part of the elastic part 82, thereby releasing the locking state with the insertion port 72 and easily removing the moisture-absorbing layer 51. The presence of the pressing block 83 makes the force application more concentrated and effective, avoiding disassembly difficulties or damage to the elastic part caused by unclear force application points. Meanwhile, the locking unit 8 forms a three-point force balance structure through the cooperation between the protrusion 81 and the receiving port 71, the connection between the fixed part of the elastic part 82 and the protrusion 81, and the support between the movable part of the elastic part 82 and the inner side of the insertion port 72. This structure ensures that the force on each part of the locking unit 8 is uniform in the locked state, avoiding deformation or fatigue damage caused by local stress concentration. At the same time, the material selection of the sheet-like elastic part 82 (such as engineering plastics or spring steel with certain elasticity and fatigue resistance) also ensures that it can maintain good elastic performance after long-term repeated use.

[0029] A first ventilation layer 52 has a recessed adhesive-containing groove 521 on its end face facing the noise reduction layer 53. A noise reduction layer adhesive-containing groove 531 is recessed on its end face facing both the first and second ventilation layers 52 and 54. A second ventilation layer adhesive-containing groove 541 is recessed on its end face facing the noise reduction layer 53. The first ventilation layer adhesive-containing groove 521 and the noise reduction layer adhesive-containing groove 531 are staggered in the horizontal direction, as are the second ventilation layer adhesive-containing groove 541 and the noise reduction layer adhesive-containing groove 531 in the horizontal direction. A support portion 522 is formed on the protruding end face of the first ventilation layer 52 facing the noise reduction layer 53, extending upwards through the noise reduction layer 53 and abutting against the second ventilation layer 54. The adhesive-containing groove design provides space for the adhesive, preventing it from being squeezed out into non-bonded areas during lamination. Especially at the edges of the ventilation layer and noise reduction layer or near the airflow channel, if the adhesive overflows, it may block the airflow channel or adhere to the moisture-absorbing layer 51, affecting ventilation efficiency and dehumidification performance. The presence of the adhesive reservoir effectively restricts the flow range of the adhesive, ensuring the cleanliness and unobstructed flow of the airflow channel. The adhesive grooves 521 of the first ventilation layer and 531 of the noise reduction layer are staggered in the horizontal direction. This means that when the first ventilation layer 52 and the noise reduction layer 53 are bonded together, the adhesive grooves of the two layers do not completely overlap, but form a staggered layout. This design has multiple functions: First, the adhesive applied in the adhesive grooves will spread outwards after being pressed. The staggered adhesive grooves allow the adhesive to form a maze-like flow path between the two layers, increasing the contact area between the adhesive and each layer of material. Second, the cured adhesive forms an interlocking "mortise and tenon structure" in the staggered grooves, similar to the anchoring effect of steel bars in reinforced concrete, which greatly enhances the shear strength and peel resistance between layers. Similarly, the staggered arrangement of the adhesive grooves 541 of the second ventilation layer and 531 of the noise reduction layer also plays the same reinforcing role.The support portion 522 formed on the first ventilation layer 52 extends upward through the noise reduction layer 53 and abuts against the second ventilation layer 54, forming a through-type support structure. This design has important structural significance: on the one hand, the support portion 522 precisely defines the distance between the first ventilation layer 52 and the second ventilation layer 54, ensuring that the noise reduction layer 53 will not be compressed and collapsed due to its own weight or airflow impact during long-term use, maintaining the thickness and porosity of the noise reduction layer 53, thereby maintaining the stability of its sound absorption and noise reduction performance. On the other hand, the multi-point distributed support portion 522 is inside the dehumidification component 5. The skeletal support structure enhances the compressive strength and structural stability of the entire component. Even under vibration during transportation, installation, or operation, the layers will not shift or deform relative to each other. Meanwhile, the adhesive bonding enables flexible connections between the layers, absorbing a certain amount of vibration and thermal expansion and contraction. The rigid support of the support part 522 ensures the stability of the overall structure and the precision of the interlayer spacing. This "rigid-flexible" design gives the dehumidification component 5 both good structural integrity and a certain degree of deformation adaptability, enabling it to maintain stable performance during long-term operation.

[0030] It also includes a control system, which includes a human-machine interaction module 91, a logic control module 92, a regulation module 93, and a signal acquisition module 94. The human-machine interaction module 91 is electrically connected to the logic control module 92, the logic control module 92 is electrically connected to the regulation module 93 and the signal acquisition module 94, the regulation module 93 is electrically connected to the air intake fan 2 and the air outlet fan 2, and the signal acquisition module 94 is electrically connected to the temperature sensor installed inside the housing 1. The human-machine interaction module 91 is used for setting temperature parameters and displaying equipment status. Its setting parameters include target temperature value, temperature hysteresis value and manual / automatic mode selection. The display content includes real-time temperature, fan operating status and alarm information. The signal acquisition module 94 is used to acquire the temperature signal fed back by the temperature sensor in real time and transmit the signal to the logic control module 92. The logic control module 92 includes a temperature comparison unit 921 and an instruction generation unit 922. The temperature comparison unit 921 continuously compares the real-time temperature fed back by the signal acquisition module 94 with a preset temperature threshold. The threshold is calculated from the target temperature and hysteresis. When the real-time temperature is higher than the upper threshold, it is determined that cooling is required. When the real-time temperature is lower than the lower threshold, it is determined that the temperature has reached the target. The instruction generation unit 922 generates corresponding control instruction combinations based on the current determination result: when cooling is required, it generates instructions to start the air intake fan 2 and the air outlet fan 2; when the temperature reaches the target, it generates instructions to stop the air intake fan 2 and the air outlet fan 2; when in manual mode, it directly generates corresponding start / stop instructions based on the manual instructions input by the human-machine interaction module 91. The control module 93 directly receives and executes the control commands issued by the logic control module 92. It includes a first drive unit 931 and a second drive unit 932. The first drive unit 931 is electrically connected to the contactor of the air intake fan 2 and is used to control the start and stop of the air intake fan 2. The second drive unit 932 is electrically connected to the contactor of the air outlet fan 2 and is used to control the start and stop of the air outlet fan 2. The two drive units can operate independently or in coordination to realize the synchronous start and stop of the two types of fans 2 or start and stop in a preset sequence.

[0031] Step 1: Parameter Preset and Mode Selection Operators can perform system initialization settings through the human-machine interface module 91, including setting the target temperature value (e.g., 35℃), setting the temperature hysteresis value (e.g., ±5℃), and selecting the operating mode (manual mode or automatic mode). At the same time, the display interface of the human-machine interface module 91 displays the current temperature inside the chamber, the fan operating status, and alarm information in real time for operators to monitor.

[0032] Step 2: Real-time temperature signal acquisition After the system enters the running state, the signal acquisition module 94 continuously reads the temperature signal fed back by the temperature sensor set in the box 1 at a preset sampling frequency (such as once per second), and transmits the signal to the logic control module 92 in real time after analog-to-digital conversion and filtering.

[0033] Step 3: Temperature Comparison and Operating Status Determination The temperature comparison unit 921 inside the logic control module 92 receives real-time temperature data from the signal acquisition module 94 and calculates the upper and lower threshold values ​​for temperature control based on the target temperature value and temperature hysteresis value set in step one. The specific calculation method is as follows: Upper limit threshold = target temperature value + temperature hysteresis value (e.g., 35℃ + 5℃ = 40℃) Lower threshold = Target temperature value - Temperature hysteresis value (e.g., 35℃ - 5℃ = 30℃) The temperature comparison unit 921 continuously compares the real-time temperature with the two thresholds mentioned above, and makes the following judgment based on the comparison results: When the real-time temperature is greater than or equal to the upper limit threshold, it is determined that the temperature inside the chamber needs to be reduced. When the real-time temperature is ≤ the lower threshold, the temperature inside the chamber is considered to have met the standard. When the real-time temperature is between the upper and lower thresholds, the current state remains unchanged.

[0034] Step 4: Control Command Generation The instruction generation unit 922 inside the logic control module 92 generates a corresponding combination of control instructions based on the judgment result of the temperature comparison unit 921 and the operating mode set in step one: In automatic mode: If the system determines that "cooling is required", then it generates commands to "start the intake fan" and "start the exhaust fan". If the temperature is determined to be "the target temperature has been reached", then commands to "stop the intake fan" and "stop the exhaust fan" will be generated. If the decision is to "maintain the current state", no new start / stop commands will be generated, and the existing operating state of the wind turbine will be maintained.

[0035] In manual mode: The instruction generation unit 922 ignores the temperature comparison results and directly generates the corresponding start / stop instructions based on the manual instructions (such as "start fan" and "stop fan") input by the operator through the human-machine interaction module 91.

[0036] Step 5: Command Execution and Fan Control The control module 93 receives control commands from the logic control module 92 and executes them through its internal first drive unit 931 and second drive unit 932 respectively: The first drive unit 931 is electrically connected to the contactor of the air intake fan 2. When it receives the command to "start the air intake fan", it controls the contactor to close and the air intake fan to start running. When it receives the command to "stop the air intake fan", it controls the contactor to open and the air intake fan to stop running.

[0037] The second drive unit 932 is electrically connected to the contactor of the air outlet fan 2. When it receives the command to "start the air outlet fan", it controls the contactor to close and the air outlet fan to start running. When it receives the command to "stop the air outlet fan", it controls the contactor to open and the air outlet fan to stop running.

[0038] Step Six: Cooperative Control and Special Timing The two drive units can operate independently or in tandem. Based on a preset control strategy, the instruction generation unit 922 can generate synchronous or asynchronous control instructions to achieve the following operating modes for the two types of fans: Synchronous start-stop mode: The intake fan and the exhaust fan start and stop simultaneously to achieve maximum ventilation.

[0039] Sequential start / stop mode: When starting, the intake fan starts first, and the exhaust fan starts after a preset delay (e.g., 5 seconds) to optimize the air pressure balance inside the box and avoid instantaneous negative pressure; when stopping, the intake fan stops first, and the exhaust fan stops after a preset delay to make full use of residual heat for exhaust.

[0040] Step 7: Cyclic Monitoring and Dynamic Adjustment After completing one round of instruction execution, the system automatically returns to step two to continue collecting temperature signals in real time, repeating the control flow from steps three to six to achieve dynamic closed-loop regulation of the internal temperature of enclosure 1. When any abnormal situation is detected (such as sensor failure, fan overload, communication failure, etc.), the logic control module 92 immediately issues an alarm message through the human-machine interaction module 91 and executes corresponding actions (such as forced shutdown, maintaining the current state, etc.) according to the preset fault protection strategy.

[0041] Through the above steps, the system can stabilize the internal temperature within the preset range without manual intervention, achieving fully automatic constant temperature control. This ensures that the internal electrical equipment is always in a suitable operating environment, extending equipment life. Furthermore, the fan automatically starts only when cooling is needed and automatically stops once the target temperature is reached, avoiding energy waste caused by prolonged continuous fan operation in traditional solutions. The coexistence of manual and automatic modes meets diverse needs such as equipment debugging, fault diagnosis, and operation under special conditions, improving the system's adaptability and operability. The independent design of the first and second drive units enables separate control of the inlet and outlet fans, providing hardware support for various control strategies such as synchronous start / stop and sequential start / stop, optimizing ventilation and air pressure balance. The real-time display function of the human-machine interface module allows maintenance personnel to intuitively grasp the internal temperature, fan status, and alarm information, facilitating timely problem detection and handling, and reducing maintenance difficulty and downtime.

[0042] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A box-type substation with an internal ventilation circulation structure, comprising a box (1), characterized in that: The box (1) has an air inlet (11) at the bottom for guiding outside air into the box (1) and several air outlets (12) at the top for discharging internal air that has absorbed working heat from the box (1). A fan (2) is provided at both the air inlet (11) and the air outlet (12). A mounting base (3) is installed on the outside of the fan (2) so that the fan (2) can be installed on the box (1). A dustproof mesh cover (4) is installed at the air outlet of the mounting base (3) to remove dust from the air before the wind enters the box (1). The dustproof mesh cover (4) is installed at the air outlet of the mounting base (3) and also restricts the assembly of the fan (2) to prevent it from separating from the mounting base (3). A dehumidifying component (5) is provided at the air outlet of the dustproof mesh cover (4) to dry the air before the wind enters the box (1).

2. The prefabricated substation with an internal ventilation circulation structure according to claim 1, characterized in that: The fan (2) includes an outer frame (21), a fan (22), and a drive motor (23). The outer frame (21) is used to assemble and connect with the mounting base (3). The fan (22) is inserted into the drive shaft of the drive motor (23), and when the drive motor (23) is installed in the center position of the outer frame (21), the fan (22) is placed inside the outer frame (21).

3. The prefabricated substation with an internal ventilation circulation structure according to claim 2, characterized in that: The outer frame (21) consists of a plurality of first rings (211) of equal diameter on the outer outer wall, a plurality of second rings (212) of different diameter on the outer bottom wall, and a plurality of third rings (213) of different diameter on the inner insert structure. The plurality of first rings (211) are equidistantly distributed along the axial direction. The outer diameter of the plurality of second rings (212) gradually expands outward along the radial direction, and the second ring (212) with the largest outer diameter is equal to the first ring (211). The outer diameter of the plurality of third rings (213) gradually expands outward along the radial direction and is also equidistantly distributed along the axial direction. The third ring (213) with the smallest outer diameter is engaged with the drive motor (23). A plurality of connecting arms (214) equidistantly distributed along the circumferential direction are connected between these first rings (211), second rings (212), and third rings (213).

4. The prefabricated substation with an internal ventilation circulation structure according to claim 3, characterized in that: The portion of the connecting arm (214) connected to the first ring (211) has an outwardly extending section (2141) that is not connected to the first ring (211). The end of the extension section (2141) has a connecting ear (2142) that is bent outward at 90°. The connecting ear (2142) and the extension section (2141) are used as a flexible snap-fit ​​structure when the outer frame (21) and the mounting base (3) are assembled and connected. The snap-fit ​​connection is used to achieve pre-assembly with the mounting base (3). The air outlet end of the mounting base (3) is provided with bolts at positions corresponding to each connecting ear (2142) to prevent the fan (2) and the mounting base (3) from separating.

5. The prefabricated substation with an internal ventilation circulation structure according to claim 1, characterized in that: The dehumidification component (5) includes a moisture-absorbing layer (51), a first ventilation layer (52), a noise reduction layer (53), and a second ventilation layer (54). The first ventilation layer (52) has a confluence portion (521) protruding from the end face of the fan (2). The confluence portion (521) extends along the edge of the first ventilation layer (52), and the extended confluence portion (521) is connected end to end to form a flow-blocking structure that prevents the gas falling on the confluence portion (521) from flowing out. The moisture-absorbing layer (51) is placed inside the flow-blocking structure, and the moisture-absorbing layer (51) also has a waterproof sticker (55) attached to the end face of the first ventilation layer (52) near the end face of the first ventilation layer (52).

6. The prefabricated substation with an internal ventilation circulation structure according to claim 5, characterized in that: The flow-blocking structure is also provided with a pressure cap (6) that prevents the moisture-absorbing layer (51) from detaching when it is placed inside. The pressure cap (6) is hollowed out in the middle and four side frames (61) that form a rectangular frame are formed by the hollowing out. A guide slope (611) that defines the direction of gas flow is formed between the inner side and the lower end of the side frame (61). A locking node (7) is provided at the center of the lower end of each side frame (61). A locking unit (8) is provided at the center of the outer side of the moisture-absorbing layer (51) to combine with the locking node (7) to keep the moisture-absorbing layer (51) and the pressure cap (6) in the assembled state. The locking unit (8) has a preset shape and can be retracted when squeezed. When combined with the locking node (7), it can spring back to the preset shape.

7. The prefabricated substation with an internal ventilation circulation structure according to claim 6, characterized in that: The locking node (7) includes a receiving opening (71) formed on the lower end face of the frame (61), an insertion port (72) formed in the receiving opening (71), a spring-back space (73) defined within the insertion port (72), and a guide channel (74) that communicates with the receiving opening (71) and has a guiding function. The receiving opening (71) is used to conceal the locking unit (8) when the locking unit (8) is combined with the locking node (7). The insertion port (72) is used to combine with the locking unit (8), and after combination, the locking unit (8) is made to spring back to a preset shape through the spring-back space (73). The guide channel (74) is used to assist in controlling the compression of the locking unit (8).

8. The prefabricated substation with an internal ventilation circulation structure according to claim 7, characterized in that: The locking unit (8) includes a protrusion (81), an elastic part (82) in a preset shape, and a pressing block (83). The protrusion (81) is fixed at the center of the outer side of the moisture-absorbing layer (51) and is placed in the receiving opening (71) to achieve concealment when the locking unit (8) and the locking node (7) are combined. The elastic part (82) is a sheet-like component and is bent to form two parts. One part is fixed on the protrusion (81), and the other part is supported on the inner side of the insertion opening (72). The pressing block (83) is fixed on the other part of the elastic part (82) supported on the inner side of the insertion opening (72) and is also placed in the guide channel (74).

9. The prefabricated substation with an internal ventilation circulation structure according to claim 5, characterized in that: The first ventilation layer (52) is recessed at the end face facing the noise reduction layer (53) and has a first ventilation layer adhesive groove (521). The noise reduction layer (53) is recessed at the end face facing the first ventilation layer (52) and the second ventilation layer (54) and has a noise reduction layer sol groove (531). The second ventilation layer (54) is recessed at the end face facing the noise reduction layer (53) and has a second ventilation layer adhesive groove (541). The first ventilation layer adhesive groove (521) and the noise reduction layer adhesive groove (531) are arranged alternately in the horizontal direction, and the second ventilation layer adhesive groove (541) and the noise reduction layer adhesive groove (531) are arranged alternately in the horizontal direction. The first ventilation layer (52) is protruding at the end face facing the noise reduction layer (53) and has a support portion (522) that extends upward through the noise reduction layer (53) and abuts against the second ventilation layer (54).

10. The prefabricated substation with an internal ventilation circulation structure according to claim 1, characterized in that: It also includes a control system, which includes a human-machine interaction module (91), a logic control module (92), a regulation module (93), and a signal acquisition module (94). The human-machine interaction module (91) is electrically connected to the logic control module (92), the logic control module (92) is electrically connected to the regulation module (93) and the signal acquisition module (94), the regulation module (93) is electrically connected to the fan (2) for air intake and the fan (2) for air outlet, and the signal acquisition module (94) is electrically connected to the temperature sensor installed in the housing (1). The human-machine interaction module (91) is used for setting temperature parameters and displaying equipment status. Its setting parameters include target temperature value, temperature hysteresis value and manual / automatic mode selection. The display content includes real-time temperature, fan operating status and alarm information. The signal acquisition module (94) is used to acquire the temperature signal fed back by the temperature sensor in real time and transmit the signal to the logic control module (92). The logic control module (92) includes a temperature comparison unit (921) and an instruction generation unit (922). The temperature comparison unit (921) is used to continuously compare the real-time temperature fed back by the signal acquisition module (94) with the preset temperature threshold. The threshold is calculated from the target temperature and the hysteresis. When the real-time temperature is higher than the upper threshold, it is determined that cooling is required. When the real-time temperature is lower than the lower threshold, it is determined that the temperature has reached the standard. The instruction generation unit (922) is used to generate a corresponding combination of control instructions based on the current determination result: when cooling is required, it generates an instruction to start the fan (2) for air intake and the fan (2) for air outlet; when the temperature reaches the standard, it generates an instruction to stop the fan (2) for air intake and the fan (2) for air outlet; when in manual mode, it directly generates the corresponding start and stop instructions based on the manual instructions input by the human-machine interaction module (91). The control module (93) directly receives and executes the control commands issued by the logic control module (92). It includes a first drive unit (931) and a second drive unit (932). The first drive unit (931) is electrically connected to the contactor of the air intake fan (2) and is used to control the start and stop of the air intake fan (2). The second drive unit (932) is electrically connected to the contactor of the air outlet fan (2) and is used to control the start and stop of the air outlet fan (2). The two drive units can operate independently or in coordination to realize the synchronous start and stop of the two types of fans (2) or start and stop in a preset time sequence.

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