Outdoor anti-condensation power distribution box suitable for high humidity environment

Abstract

The application relates to the technical field of power distribution equipment, in particular to an outdoor anti-condensation power distribution box suitable for a high-humidity environment, which comprises a sealed box body, a refrigeration and dehumidification module is arranged in the sealed box body, the refrigeration and dehumidification module has a cold end and a hot end, a wind force circulation module is sealingly connected to the top of the refrigeration and dehumidification module, the wind force circulation module has an internal air outlet channel and an external air outlet channel; a condensate water scraping module is arranged in the refrigeration and dehumidification module and corresponds to the cold end; an air inlet and drainage module is sealingly connected to the bottom of the refrigeration and dehumidification module, the air inlet and drainage module has an internal air inlet channel and an external air inlet channel; the refrigeration and dehumidification module, the wind force circulation module and the condensate water scraping module are connected with the same control system. The application combines an active semiconductor dehumidification system with a passive sealed box body, constructs a multi-level and intelligent anti-condensation solution and realizes efficient and active anti-condensation.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, specifically to an outdoor anti-condensation distribution box suitable for high humidity environments. Background Technology

[0002] Distribution boxes operating in outdoor environments with high humidity and large temperature differences are highly susceptible to condensation. Condensation adhering to electrical components, terminals, and busbar surfaces significantly reduces insulation strength, leading to faults such as short circuits, flashovers, and grounding failures. It also accelerates corrosion of metal parts, causing protection modules to malfunction or fail to operate, seriously threatening power supply safety and equipment lifespan. Therefore, implementing effective anti-condensation measures for outdoor distribution boxes is crucial.

[0003] Currently, common anti-condensation solutions mainly rely on improving the enclosure's sealing level, installing rain covers, placing silica gel desiccants inside the enclosure, or using heaters to increase the internal temperature to reduce relative humidity. However, desiccants are easily saturated and require frequent maintenance and replacement; simply strengthening the seal and using heating methods will increase the internal temperature, which is detrimental to the heat dissipation of electrical components inside the enclosure.

[0004] Therefore, how to develop an anti-condensation distribution box that can proactively, efficiently, and energy-savingly prevent condensation and adapt to long-term reliable operation in harsh outdoor environments is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to enable the distribution box to actively, efficiently and energy-savingly prevent condensation, this application provides an outdoor anti-condensation distribution box suitable for high humidity environments.

[0006] The technical solution adopted in this application is as follows: An outdoor anti-condensation distribution box suitable for high humidity environments includes a sealed enclosure. A refrigeration and dehumidification module is installed inside the sealed enclosure. The refrigeration and dehumidification module has a cold end and a hot end. A wind circulation module is sealed and connected to the top of the refrigeration and dehumidification module, and the wind circulation module has an internal air outlet channel and an external air outlet channel. A condensate scraping module is installed inside the refrigeration and dehumidification module corresponding to the cold end. An air inlet and drainage module is sealed and connected to the bottom of the refrigeration and dehumidification module, and the air inlet and drainage module has an internal air inlet channel and an external air inlet channel. The cold end communicates with the internal air inlet channel and the internal air outlet channel to form an internal circulation, and the hot end communicates with the external air inlet channel and the external air outlet channel to form an external circulation. The refrigeration and dehumidification module, the wind circulation module, and the condensate scraping module are connected to the same control system.

[0007] By adopting the above technical solution, an active, intelligent, and physically isolated anti-condensation system was constructed. When the humidity inside the chamber is too high, the control system is activated, driving the internal and external circulation to operate synchronously. The internal circulation airflow is cooled and dehumidified as it flows through the cold end of the refrigeration and dehumidification module, returning dry air to the chamber, thereby actively and powerfully lowering the dew point of the air inside the chamber; the external circulation airflow dissipates heat from the hot end, ensuring refrigeration efficiency. This system achieves precise, on-demand control of the humidity inside the chamber, fundamentally preventing condensation, and the complete isolation between the internal and external circulation prevents the intrusion of external moisture, resulting in high efficiency and energy saving.

[0008] Furthermore, the cooling and dehumidifying module includes at least one heat-insulating box, in which a semiconductor cooling chip is sealed and installed. The cooling end and heating end of the semiconductor cooling chip form the cold end and the hot end, respectively. The heat-insulating box is connected to the air circulation module near its top and to the air inlet and drainage module near its bottom.

[0009] By adopting the above technical solution, the core heat exchange unit is modularized. The insulated housing effectively isolates the cold and hot ends, preventing the mutual cancellation of heat and cold and improving energy efficiency. The semiconductor refrigeration chip, as the core refrigeration element, has the advantages of no moving parts, long lifespan, and precise control. This structure integrates refrigeration and airflow channels into one compact layout, facilitating installation and maintenance.

[0010] Furthermore, a cold end connecting pipe and a hot end connecting pipe are respectively sealed and connected near the top of the heat insulation box. The cold end connecting pipe is sealed and connected to the cold end, and the hot end connecting pipe is sealed and connected to the hot end. The cold end connecting pipe is connected to the internal air outlet channel in the wind power circulation module, and the hot end connecting pipe is connected to the external air outlet channel in the wind power circulation module.

[0011] By adopting the above technical solution and utilizing pipe connections, the airflow paths for internal and external circulation are clearly defined and solidified. The cold-end connecting pipe guides dry, cold air into the chamber, while the hot-end connecting pipe guides heat dissipation exhaust gas out of the chamber. The two paths are physically completely isolated, ensuring the dryness and purity of the internal circulating air and the high efficiency of the external circulating heat dissipation.

[0012] Furthermore, the heat insulation box body has an internal air inlet and an external air inlet and a drainage outlet at its bottom. The air inlet and drainage module is fixedly and sealed at the bottom of the heat insulation box body. The internal air inlet and drainage outlet is connected to the internal air inlet channel, and the external air inlet and drainage outlet is connected to the external air inlet channel.

[0013] By adopting the above technical solution, integrated interface management of airflow and drainage is achieved at the bottom. The internal air inlet and outlet simultaneously serve the dual functions of introducing humid air and discharging condensate, resulting in a highly efficient structure; the external air inlet and outlet are dedicated to introducing fresh air for heat dissipation. This centralized bottom interface design simplifies the sealing structure, enhances the overall sealing reliability of the system, and conforms to the principle that condensate is naturally discharged by gravity.

[0014] Furthermore, a cold-end heat exchange plate is fixedly installed on the cooling end of the semiconductor refrigeration chip, and a hot-end heat exchange plate is fixedly installed on the heating end of the semiconductor refrigeration chip. The cold-end heat exchange plate has multiple equidistant and vertically arranged cold-end heat exchange slots, and the hot-end heat exchange plate has multiple equidistant and vertically arranged hot-end heat exchange slots.

[0015] By adopting the above technical solutions, the heat exchange area is greatly increased and the airflow organization is optimized. The dense vertical heat exchange troughs ensure full contact between the air and the heat exchange plates, significantly improving dehumidification and heat dissipation efficiency. In particular, the vertical design of the cold-end heat exchange troughs provides a smooth gravity-driven path for condensate, enabling automatic collection and diversion of condensate and preventing water accumulation from affecting heat exchange.

[0016] Furthermore, the wind circulation module includes a blower duct, which is fixedly and sealed on the top surface of the sealed housing. A dual-shaft extension motor is fixedly and sealed in the middle of the blower duct, and fan blades are fixedly installed at both ends of the output shaft of the dual-shaft extension motor. A cold air circulation pipe is sealed and connected to the outside of the blower duct inside the sealed housing, and the cold air circulation pipe connects the blower duct to the cold end of the refrigeration and dehumidification module. A hot air circulation pipe is sealed and connected to the outside of the blower duct outside the sealed housing, and the hot air circulation pipe connects the blower duct to the hot end of the refrigeration and dehumidification module.

[0017] By adopting the above technical solution, a single dual-shaft motor simultaneously drives both internal and external circulating fans, resulting in a highly compact structure and lower energy consumption and cost. The blower duct, as the main structural component, maintains the overall airtightness of the enclosure through its installation method. The cold and hot air circulation pipes clearly define the airflow direction, ensuring that the internal and external circulation are physically isolated at the power source, resulting in efficient and reliable operation.

[0018] Furthermore, the condensate removal module includes a threaded shaft, which is rotatably connected inside the cold end of the heat insulation box. A scraper is slidably connected inside the cold end, and the scraper has a scraping groove that matches the heat exchange groove of the cold end. A threaded hole is opened on the scraper corresponding to the threaded shaft, and the scraper is threadedly connected to the threaded shaft through the threaded hole. A drive motor for driving the threaded shaft is fixedly installed at the bottom of the heat insulation box.

[0019] By adopting the above technical solution, automatic and timed removal of condensate from the heat exchange tank wall is achieved. Precise matching between the scraper and the heat exchange tank ensures thorough cleaning without any blind spots. The threaded drive converts the motor's rotational motion into a smooth, linear scraping motion of the scraper, reliably removing water droplets or thin ice adhering to the tank wall, thereby maintaining optimal heat exchange efficiency on the heat exchange plate surface and preventing performance degradation or structural damage caused by water accumulation or icing.

[0020] Furthermore, the air intake and drainage module includes an air intake and drainage box. The air intake and drainage box has an internal connecting cavity and an external connecting cavity. A water collection trough is provided at the bottom of the internal connecting cavity. A water seal bend is fixedly installed at the bottom of the water collection trough. The other end of the water seal bend is sealed and connected to the external connecting cavity. An air intake and drainage port is provided on the side wall of the box corresponding to the external connecting cavity. An internal air intake port is provided in the internal connecting cavity near the water collection trough. The internal connecting cavity passes through the top of the air intake and drainage box and is connected to the cold end of the refrigeration and dehumidification module. The external connecting cavity passes through the top of the air intake and drainage box and is connected to the hot end of the refrigeration and dehumidification module.

[0021] By adopting the above technical solution, the functions of internal circulation air intake, external circulation air intake, and condensate drainage are highly integrated. The internal and external connecting chambers are physically isolated to ensure that the airflow does not mix. The water seal bend forms a reliable water seal, ensuring that condensate can be discharged smoothly, while permanently preventing external humid air and dust from flowing back into the chamber through the drainage path. This is a key design feature to ensure the long-term dryness of the chamber.

[0022] Furthermore, the control system includes a controller and a temperature and humidity sensor installed inside the sealed enclosure. The controller is electrically connected to the temperature and humidity sensor, the cooling and dehumidification module, the air circulation module, and the condensate removal module.

[0023] By adopting the above technical solution, the system achieves fully automatic intelligent operation. Temperature and humidity sensors provide real-time environmental feedback, and the controller coordinates the operation of each component according to preset logic: starting and stopping cooling and fans as needed, and initiating the dehumidification program at set intervals. This achieves precise, on-demand dehumidification, avoids energy waste, and extends equipment lifespan and improves overall reliability through optimized management of the operating sequence.

[0024] Furthermore, a sealing door is rotatably connected to the front end of the sealing box, and a sealing gasket is fixedly installed on the sealing door corresponding to the front end of the sealing box. A top plate is fixedly and sealed on the top of the sealing box, and a top cover is installed on the top of the top plate. An electrical component mounting bracket is fixedly connected to the inner side of the rear end of the sealing box. A wire hole is opened on the bottom surface of the sealing box, and a sealing sleeve is fixedly installed in the wire hole.

[0025] By adopting the above technical solutions, the basic protective and load-bearing structure of the distribution box is constructed. The sealed enclosure, door, gasket, top plate, and sealing sleeve together provide a high level of sealing protection, effectively preventing the intrusion of external moisture and dust. The electrical component mounting rack ensures a neat and stable internal layout. This basic structure provides a stable and reliable operating environment for the internal active dehumidification system, and the two together form a multi-level protection system.

[0026] This application provides an outdoor anti-condensation distribution box suitable for high humidity environments. It combines an active semiconductor dehumidification system with a passive sealed enclosure to create a multi-layered, intelligent anti-condensation solution. Its beneficial effects are mainly reflected in: 1. Highly efficient active anti-condensation: Through a dual-circulation air duct that is completely isolated inside and outside, the intelligent control system drives the semiconductor cooling chip to force-cool and dehumidify the air inside the chamber. It can actively and quickly reduce the dew point of the air inside the chamber to an extremely low level, fundamentally reducing condensation on the surface of electrical equipment. Its moisture-proof capability far exceeds that of passive protection methods.

[0027] 2. High efficiency and energy saving and intelligent control: The system automatically starts and stops and adjusts the power according to the actual temperature and humidity inside the chamber, realizing precise on-demand dehumidification and avoiding energy waste; and can maintain the heat exchanger's long-term high efficiency through the automatic water scraping function, making operation economical and intelligent.

[0028] 3. High reliability and long lifespan: Modular design, physically isolated air ducts, reliable sealing structure and automatic maintenance function together ensure long-term stable operation of the system in harsh outdoor environments, reducing maintenance requirements.

[0029] 4. Comprehensive improvement in safety level: Effectively reduces the risk of condensation inside the enclosure, greatly reduces the probability of electrical faults such as short circuits, leakage, and corrosion caused by moisture, provides the highest level of dry operation protection for sensitive electrical equipment inside the enclosure, and significantly improves the overall safety and reliability of outdoor power distribution facilities. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.

[0031] Figure 2 This is an exploded view of the structure of one embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the internal structure of one embodiment of this application.

[0033] Figure 4 This is an exploded view of the structure of the refrigeration and dehumidification module in one embodiment of this application.

[0034] Figure 5This is a schematic diagram of the bottom structure of the heat insulation box body in one embodiment of this application.

[0035] Figure 6 This is an exploded view of the structure of the wind power circulation module in one embodiment of this application.

[0036] Figure 7 This is an exploded view of the air intake and drainage module in one embodiment of this application.

[0037] Figure 8 This is an exploded view of the structure of the condensate scraping module in one embodiment of this application.

[0038] Figure 9 yes Figure 3 Enlarged schematic diagram of Part I of the structure.

[0039] Explanation of reference numerals in the attached drawings: 100, Sealed enclosure; 101, Sealed door; 102, Sealing gasket; 103, External fixing bracket; 104, Top plate; 105, Top cover; 106, Electrical component mounting bracket; 107, Bottom support foot; 108, Wiring hole; 109, Sealing sleeve; 200, Refrigeration and dehumidification module; 201, Insulated box; 202, Partition; 203, Mounting slot; 204, Mounting bracket; 205, Semiconductor refrigeration chip; 206, Cold end connecting pipe; 207, Hot end connecting pipe; 208, Internal air inlet and outlet; 209, External air inlet and outlet; 210, Cold end heat exchange plate; 211, Hot end heat exchange plate; 212, Cold end heat exchange groove; 213 300. Heat exchanger trough; 301. Wind power circulation module; 302. Blower; 303. Dual-shaft extension motor; 304. Fan blade; 305. Protective cover; 306. Cold air circulation pipe; 407. Hot air circulation pipe; 408. Condensate scraping module; 409. Threaded shaft; 400. Scraper; 401. Scraper groove; 402. Threaded hole; 403. Drive motor; 404. Driven gear; 405. Driven gear; 406. Air inlet and drainage module; 507. Air inlet and drainage box; 508. Internal connecting cavity; 509. External connecting cavity; 500. Water collection trough; 500. Water seal bend; 501. Air inlet and drainage outlet; 502. Internal air inlet; 503. Protective net. Detailed Implementation

[0040] The following combination Figures 1-9 This application will be described in further detail.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] This application discloses an outdoor anti-condensation distribution box suitable for high humidity environments.

[0044] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, an outdoor anti-condensation distribution box suitable for high humidity environments includes a sealed box body 100. A sealed box door 101 is rotatably connected to the front end of the sealed box body 100. A sealing gasket 102 is fixedly installed on the sealed box door 101 corresponding to the front end of the sealed box body 100. An external fixing bracket 103 is fixedly connected to the outer side of the rear end of the sealed box body 100. A top plate 104 is fixedly and sealed on the top of the sealed box body 100. A top cover 105 is installed on the top of the top plate 104. An electrical component mounting bracket 106 is fixedly connected to the inner side of the rear end of the sealed box body 100. A bottom support foot 107 is fixedly installed on the bottom of the sealed box body 100. A wire hole 108 is opened on the bottom surface of the sealed box body 100. A sealing sleeve 109 is fixedly and sealed in the wire hole 108.

[0045] During operation, the sealed enclosure 100 and the sealed door 101 with the sealing gasket 102 together form the main sealing barrier, ensuring the independence and stability of the internal environment. All external cables are introduced through the cable entry hole 108 equipped with a sealing sleeve 109, and after the external cables pass through the sealing sleeve 109, sealing mud is inserted into the sealing sleeve 109 for sealing, completely solving the sealing problem of the cable entry. Based on achieving a complete seal, the top cover 105 forms a rainproof ventilation cavity above the sealed enclosure 100. The electrical component mounting bracket 106 provides a stable and neat mounting base for the internal electrical components, which is conducive to heat dissipation and maintenance. The sealed enclosure 100 can be firmly installed on an outdoor mounting bracket or building exterior wall using the external fixing bracket 103. Alternatively, the sealed enclosure 100 can be placed on an outdoor mounting platform using the bottom support feet 107, which can lift the bottom of the sealed enclosure 100 off the mounting platform to prevent water accumulation and corrosion.

[0046] Please refer to the above as well. Figures 1 to 9 In one embodiment of this application, refrigeration and dehumidification modules 200 are symmetrically installed near both sides of the sealed housing 100. Each refrigeration and dehumidification module 200 has a cold end and a hot end. A wind circulation module 300 is sealed and connected to the top of the refrigeration and dehumidification module 200, and the wind circulation module 300 has an internal air outlet channel and an external air outlet channel. A condensate scraping module 400 is installed inside the refrigeration and dehumidification module 200 corresponding to the cold end. An air inlet and drainage module 500 is sealed and connected to the bottom of the refrigeration and dehumidification module 200, and the air inlet and drainage module 500 has an internal air inlet channel and an external air inlet channel. The cold end communicates with the internal air inlet channel and the internal air outlet channel to form an internal circulation, and the hot end communicates with the external air inlet channel and the external air outlet channel to form an external circulation. The refrigeration and dehumidification module 200, the wind circulation module 300, and the condensate scraping module 400 are connected to the same control system, which is used to automatically control the operation of the refrigeration and dehumidification module 200, the wind circulation module 300, and the condensate scraping module 400 according to environmental parameters.

[0047] During operation, the control system monitors the temperature and humidity inside the sealed enclosure 100 in real time. When the humidity exceeds the set threshold, the system automatically starts. The semiconductor cooling chip in the cooling and dehumidification module 200 begins to work, its cold end cooling the flowing air, causing water vapor in the air to condense into condensate on the surface of the cold end; its hot end generates waste heat. The air circulation module 300 starts simultaneously. Under the action of the air circulation module 300, the humid air inside the sealed enclosure 100 is drawn in through the internal air intake channel of the air intake and drainage module 500, flows through the cold end for dehumidification and cooling, and then the dry, cold air is sent back into the enclosure through the internal air outlet channel of the air circulation module 300, thus forming an internal circulation that continuously reduces the absolute moisture content and temperature of the air inside the enclosure. At the same time, external air is introduced through the external air intake channel of the air intake and drainage module 500, flows through the hot end for forced air cooling, and the air that has absorbed heat is then discharged outside the enclosure through the external air outlet channel of the air circulation module 300, thus forming an external circulation that ensures the efficient and stable operation of the cooling chip. Condensation generated at the cold end is automatically removed periodically by the condensate removal module 400 and guided to the drainage structure of the air intake and drainage module 500 for discharge outside the chamber. When the humidity inside the chamber drops to a safe range, the control system puts the entire module into a low-power standby state.

[0048] This application actively and powerfully lowers the dew point temperature of the air inside the chamber to a level far below the surface temperature of the chamber walls and electrical components, fundamentally preventing condensation. Furthermore, its dehumidification capabilities are not strictly limited by external climatic conditions. The completely physical isolation between internal and external circulation ensures that while external air is introduced for heat dissipation, high-humidity external air will never mix with the already dehumidified air inside the chamber, resulting in high dehumidification efficiency and targeted energy utilization. The control system automatically starts, stops, and adjusts operating power based on actual environmental parameters, avoiding energy waste caused by continuous operation and achieving a balance between high-efficiency dehumidification and low energy consumption. The condensate scraping module 400 automatically removes condensate, preventing water accumulation that could breed mold or affect cooling efficiency. The symmetrically arranged two sets of modules provide redundancy, maintaining partial dehumidification capacity even in the event of a single module failure, ensuring high overall system reliability.

[0049] Please refer to the above as well. Figures 1 to 9In one specific embodiment of this application, the cooling and dehumidifying module 200 includes two symmetrically arranged heat-insulating boxes 201. The heat-insulating boxes 201 are symmetrically installed inside the sealed box 100 near its two sides. A partition 202 is centrally and sealed inside the heat-insulating box 201. A mounting groove 203 penetrating the partition 202 is opened at the rear end of the heat-insulating box 201. A mounting bracket 204 is sealed and inserted inside the mounting groove 203. A semiconductor cooling chip 205 is fixedly and sealed on the mounting bracket 204. The cooling end and heating end of the semiconductor cooling chip 205 face the two sides of the partition 202, respectively. The cavities on both sides of the partition 202 form a cold end and a hot end, respectively. The heat-insulating box 201 is connected to the air circulation module 300 near its top position, and the heat-insulating box 201 is connected to the air inlet and drainage module 500 near its bottom position.

[0050] During operation, when the control system activates the cooling and dehumidification module 200, the thermoelectric cooler 205 is powered on. Based on the Peltier effect, its cooling end absorbs heat and cools down, while its heating end releases heat and heats up. The partition 202 strictly divides the inner cavity of the insulated box 201 into two independent airflow channels: one side is the low-temperature cold-end chamber, and the other side is the high-temperature hot-end chamber. The mounting bracket 204 is sealed and inserted through the mounting slot 203, ensuring that the thermoelectric cooler 205 is securely installed while its cold and hot sides can precisely extend into their respective chambers and exchange heat efficiently with the flowing air. The insulation material of the insulated box 201 itself minimizes direct heat conduction between the cold and hot ends through the box wall and reduces heat exchange with the internal environment, thereby concentrating the energy of the cooler for dehumidification and heat dissipation.

[0051] The combination of partition 202 and insulated box 201 achieves physical and thermal isolation between the cold and hot airflows. This ensures that the humid air circulating internally is cooled and dehumidified only at the cold end, while the heat dissipation air circulating externally absorbs waste heat only at the hot end, with no interference between the two, greatly improving energy utilization efficiency and dehumidification effect. Furthermore, the core refrigeration element, the semiconductor cooling chip 205, is modularly and standardizedly integrated into the airflow channel through the insertion and sealing design of the mounting slot 203 and mounting bracket 204. This structure not only facilitates installation and maintenance, but its reliable sealing is also crucial in preventing short circuits or leaks between the internal and external airflows, ensuring the effectiveness of the system design. The symmetrical arrangement of the two insulated boxes 201 allows the two independent dehumidification units to work collaboratively, improving the overall dehumidification capacity and ensuring the continuity and reliability of the distribution box's moisture-proof function.

[0052] Please refer to the above as well. Figures 1 to 9In one specific embodiment of this application, a cold end connecting pipe 206 and a hot end connecting pipe 207 are respectively sealed and connected near the top of the heat insulation box 201. The cold end connecting pipe 206 is sealed and connected to the cold end, and the hot end connecting pipe 207 is sealed and connected to the hot end. The cold end connecting pipe 206 is connected to the internal air outlet channel in the wind power circulation module 300, and the hot end connecting pipe 207 is connected to the external air outlet channel in the wind power circulation module 300.

[0053] During operation, the cold end connecting pipe 206 and the hot end connecting pipe 207 serve as key airflow guiding pipes, precisely connecting the core heat exchange chamber of the refrigeration and dehumidification module 200 with the power and distribution module of the wind circulation module 300, forming a complete and isolated internal and external dual circulation airflow channel.

[0054] The dry, cool air, after being cooled and dehumidified at the cold end, is directed through the cold end connecting pipe 206 to the internal air outlet channel of the air circulation module 300, driven by the internal fan. It is then smoothly returned to the main cavity of the sealed housing 100, completing the closed loop of the internal circulation. Simultaneously, the air that has absorbed waste heat from the semiconductor cooling chip 205 at the hot end is guided through the hot end connecting pipe 207 to the external air outlet channel of the air circulation module 300, driven by another fan. It is then efficiently exhausted outside the housing, completing the external circulation heat dissipation and exhaust process.

[0055] The cold-end connecting pipe 206 and the hot-end connecting pipe 207 clearly define the paths of the internal and external circulation in the form of physical pipes. This rigid connection ensures absolute isolation between the two airflows during transmission, preventing the mixing of dry air and humid exhaust gas, and guaranteeing dehumidification efficiency and heat dissipation effect. Through standardized pipe connections, the refrigeration and dehumidification module 200 and the air circulation module 300 are decoupled yet tightly integrated. This modular design facilitates independent production, testing, and on-site installation of each component, while also simplifying later maintenance and replacement. The airtight connection ensures a leak-free and stable operation of the entire circulation system. It ensures sufficient and uniform heat exchange between the air and the cold and hot end surfaces of the semiconductor cooling chip 205, thereby improving overall dehumidification and heat dissipation efficiency.

[0056] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, an internal air inlet and drain outlet 208 and an external air inlet and drain outlet 209 are respectively provided on the bottom of the heat insulation box 201. The air inlet and drain outlet module 500 is fixedly and sealed on the bottom of the heat insulation box 201. The internal air inlet and drain outlet 208 is connected to the internal air inlet channel, and the external air inlet and drain outlet 209 is connected to the external air inlet channel.

[0057] During operation, the air requiring dehumidification inside the chamber is collected through the internal air intake channel of the air intake and drainage module 500 under the drive of airflow, and precisely introduced into the cold end chamber of the insulated box 201 via the internal air intake and drainage port 208 for cooling and dehumidification. Simultaneously, ambient air is introduced into the hot end chamber through the external air intake channel of the air intake and drainage module 500 and the external air intake and drainage port 209 to absorb and remove waste heat generated by the thermoelectric cooler 205. Condensate generated at the cold end flows down the chamber wall under gravity and ultimately enters the drainage pipe of the air intake and drainage module 500 through the internal air intake and drainage port 208, being safely discharged outside the chamber, thus achieving air-water separation.

[0058] The internal air inlet / outlet 208 and the external air inlet / outlet 209 are structurally distinct, physically ensuring complete isolation between the internal and external circulation at the inlet, preventing airflow short-circuiting or cross-contamination. Simultaneously, the condensate drainage path is integrated with the air inlet channel at the bottom, conforming to the principle of gravity drainage, resulting in a highly efficient structure. This efficient condensate drainage design ensures that liquid water generated at the cold end is quickly and thoroughly drained from the housing, preventing water accumulation inside the insulated housing 201. This avoids potential problems such as electrical short circuits, corrosion of metal components, microbial growth, or structural damage due to icing expansion caused by water accumulation, fundamentally guaranteeing the long-term stable operation of the refrigeration and dehumidification module.

[0059] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, a cold end heat exchange plate 210 is fixedly installed on the cooling end of the semiconductor refrigeration chip 205, and a hot end heat exchange plate 211 is fixedly installed on the heating end of the semiconductor refrigeration chip 205. The cold end heat exchange plate 210 is provided with a plurality of equidistantly distributed and vertically arranged cold end heat exchange grooves 212, and the hot end heat exchange plate 211 is provided with a plurality of equidistantly distributed and vertically arranged hot end heat exchange grooves 213.

[0060] During operation, when the thermoelectric cooler 205 is working, the cold energy at its cooling end is discharged through the tightly fitted cold-end heat exchange plate 210, while the heat at its heating end is discharged through the hot-end heat exchange plate 211. The humid air flowing through the cold-end chamber comes into full contact with the cold walls of the cold-end heat exchange groove 212, causing water vapor in the air to quickly condense into water droplets on the surface of the groove walls, thus drying and cooling the air. Simultaneously, the water droplets condensed on the inner wall of the cold-end heat exchange groove 212 flow downwards along the vertical groove wall under gravity, achieving self-drainage. The heat dissipation air flowing through the hot-end chamber comes into full contact with the high-temperature groove walls as it passes through the hot-end heat exchange groove 213, thereby efficiently removing the waste heat generated by the thermoelectric cooler 205.

[0061] The cold-end heat exchange plate 210 and hot-end heat exchange plate 211, through their plates and densely distributed heat exchange grooves, expand the limited heat exchange surface of the semiconductor chip, enabling air to fully and uniformly exchange heat with the high and low temperature surfaces, significantly improving dehumidification and heat dissipation efficiency. The vertically arranged cold-end heat exchange groove 212 and hot-end heat exchange groove 213 form a flow channel parallel to the main airflow direction, greatly reducing airflow resistance, making airflow distribution more uniform, and reducing fan energy consumption. Especially at the cold end, the vertical grooves create a smooth gravity-driven path for condensate, achieving efficient automatic collection and guidance of condensate, preventing water accumulation. The tight fixing of the heat exchange plates to the semiconductor cooling chip 205 ensures minimal thermal resistance in the heat conduction path, allowing the semiconductor chip's working efficiency to be fully utilized. The overall structure is robust and easy to maintain and clean.

[0062] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, the wind power circulation module 300 includes a blower 301, which is fixedly and sealed on the top surface of the sealed housing 100. The upper end of the blower 301 is located on the outside of the sealed housing 100, and the lower end of the blower 301 is located on the inside of the sealed housing 100. A dual-shaft extension motor 302 is fixedly and sealed in the middle of the blower 301. Fan blades 303 are fixedly installed at both ends of the output shaft of the dual-shaft extension motor 302. Protective covers 304 are installed at both ends of the blower 301 corresponding to the fan blades 303; a cold air circulation pipe 305 is sealed and connected to the outside of the blower 301 inside the sealed housing 100, and the cold air circulation pipe 305 connects the blower 301 and the cold end of the cooling and dehumidification module 200; a hot air circulation pipe 306 is sealed and connected to the outside of the blower 301 outside the sealed housing 100, and the hot air circulation pipe 306 connects the blower 301 and the hot end of the cooling and dehumidification module 200.

[0063] During operation, when the dual-shaft extension motor 302 starts, the fan blades 303 at both ends of its output shaft rotate synchronously. Inside the enclosure, the fan blades at the lower end of the blower duct 301 generate suction, drawing dry, cool air dehumidified and cooled by the cold end of the refrigeration and dehumidification module 200 into the lower chamber of the blower duct 301 through the cold air circulation pipe 305, and then blowing it into the sealed enclosure 100, thus completing the internal circulation drive. Simultaneously, outside the enclosure, the fan blades at the upper end of the blower duct 301 generate suction, drawing air that has passed through the hot end of the refrigeration and dehumidification module 200 and absorbed waste heat into the upper chamber of the blower duct 301 through the hot air circulation pipe 306, and then directly expelling it into the external environment, thus completing the external circulation drive. The protective cover 304 effectively prevents foreign objects from contacting the high-speed rotating fan blades, ensuring operational safety.

[0064] The system employs a dual-shaft extension motor 302, which simultaneously drives both internal and external circulation fans. This centralized power and extremely compact structure saves space, reduces energy consumption and cost compared to using two independent motors, and improves system synchronization and ease of control. The blower duct 301 itself serves as a structural divider, with its internal upper and lower spaces naturally separated by the motor mounting location. Combined with the cold air circulation pipe 305 and the hot air circulation pipe 306, the internal and external circulation airflows are clearly and physically separated, preventing mixing and ensuring dehumidification and heat dissipation efficiency. The protective cover 304 prevents debris, insects, or condensation from splashing in and affecting fan operation. The entire module maintains the overall airtightness of the enclosure through the sealed installation of the blower duct 301 and the top of the housing, enabling it to withstand harsh outdoor environments such as wind, rain, and dust. Furthermore, placing the dual-shaft extension motor 302 within the airflow channel allows for natural cooling of the motor by the flowing air. This module, as an independent unit, is connected to the refrigeration and dehumidification module 200 via piping, resulting in a clear system layout that facilitates installation, commissioning, and maintenance.

[0065] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, the condensate scraping module 400 includes a threaded shaft 401, which is rotatably connected to the interior of the insulation box 201 located at the cold end. A scraper 402 is slidably connected inside the cold end. The scraper 402 has a scraping groove 403 that matches the heat exchange groove 212 at the cold end. A threaded hole 404 is opened on the scraper 402 corresponding to the threaded shaft 401. The scraper 402 is threadedly connected to the threaded shaft 401 through the threaded hole 404. A drive motor 405 for driving the threaded shaft 401 is fixedly installed at the bottom of the insulation box 201. A driven gear 406 is fixedly installed on the drive motor 405, and a drive gear 407 is fixedly installed on the output shaft of the drive motor 405. The drive gear 407 and the driven gear 406 mesh and transmit power.

[0066] During operation, the condensate removal module 400 is a key cleaning mechanism that ensures the continuous and efficient operation of the refrigeration and dehumidification module 200. Its core function is to automatically and periodically remove the condensate that accumulates on the inner wall of the cold-end heat exchange tank 212 of the cold-end heat exchange plate 210. When the control system initiates the dehumidification program based on the running time or sensor signals, the drive motor 405 starts working. Its output shaft drives the drive gear 407 to rotate, which in turn drives the driven gear 406 through gear meshing, thereby driving the threaded shaft 401 to rotate slowly. Since the scraper 402 forms a threaded transmission pair with the threaded shaft 401 through its threaded hole 404, and the scraper 402 itself is restricted to sliding up and down in the cold-end cavity, the rotational motion of the threaded shaft 401 is converted into a smooth linear motion of the scraper 402 along the axis. The scraping grooves 403 on the scraper 402 are precisely matched in shape and spacing with the cold end heat exchange tank 212, so that when the scraper 402 moves, the inner wall of its scraping grooves 403 can closely adhere to and scrape over the surface of each heat exchange tank, removing condensate droplets or thin ice layers adhering to the tank wall. The scraped liquid water flows down the tank wall under the action of gravity, and finally collects through the internal air inlet and drain outlet 208 at the bottom and is discharged outside the box into the drain channel of the air inlet and drain module 500.

[0067] This module can operate automatically on a timed and on-demand basis to thoroughly remove condensate from the cold-end heat exchange tank 212. This prevents a condensate film from forming an insulation layer on the heat exchange surface, thus maintaining the maximum temperature difference and heat exchange efficiency between the heat exchange plate and the air, ensuring continuous dehumidification. The precise matching design of the scraper groove 403 and the cold-end heat exchange tank 212 ensures that the scraper 402 can penetrate deep into each groove for cleaning, achieving comprehensive cleaning of complex heat exchange surfaces—something that simple rinsing or gravity-fed methods cannot match, effectively preventing localized water accumulation or scaling. Simultaneously, a screw drive mechanism consisting of a threaded shaft 401 and a scraper threaded hole 404 converts the motor's rotational motion into a smooth, precise linear scraping motion with uniform thrust and reliable operation. Combined with a gear set, the required deceleration and torque increase can be achieved. Motor control is simple: forward, reverse, and stop are all that's needed.

[0068] Please refer to the above as well. Figures 1 to 9In one specific embodiment of this application, the air inlet and drainage module 500 includes an air inlet and drainage box 501. The top of the air inlet and drainage box 501 is fixedly and sealed to the bottom of the refrigeration and dehumidification module 200, and the side of the air inlet and drainage box 501 is fixedly and sealed to the side wall of the housing 100. The air inlet and drainage box 501 has an internal connecting cavity 502 and an external connecting cavity 503. A water collection trough 504 is formed at the bottom of the internal connecting cavity 502, and a water seal bend 505 is fixedly installed at the bottom of the water collection trough 504. The other end of 5 is sealed and connected to the external connecting cavity 503. An air inlet and drain outlet 506 is provided on the side wall of the housing 100 corresponding to the external connecting cavity 503. An internal air inlet 507 is provided in the internal connecting cavity 502 near the water collection tank 504. A protective net 508 is fixedly installed on the internal air inlet 507. The internal connecting cavity 502 passes through the top of the air inlet and drain box 501 and is connected to the cold end of the refrigeration and dehumidification module 200. The external connecting cavity 503 passes through the top of the air inlet and drain box 501 and is connected to the hot end of the refrigeration and dehumidification module 200.

[0069] During operation, the air intake and drainage module 500 is a key integrated module for realizing the introduction of internal and external dual-circulation airflow and the centralized discharge of condensate. Its core function is to physically isolate and guide the two airflows, while providing a reliable discharge path for condensate.

[0070] The air requiring dehumidification enters the internal connecting cavity 502 through the internal air inlet 507, then flows upwards and enters the cold end of the refrigeration and dehumidification module 200 through the top opening for cooling and dehumidification. The condensate generated at the cold end flows downwards under gravity and collects in the water collection tank 504 at the bottom of the internal connecting cavity 502.

[0071] The collected condensate is discharged through the water seal bend 505. The water seal bend forms a reliable water seal, and its water trap effectively prevents external air from flowing back into the internal connecting cavity 502 through the drainage path, thus maintaining the airtightness of the environment inside the chamber while draining water. The water finally enters the external connecting cavity 503 from the outlet of the water seal bend and is discharged outside the chamber through the air inlet and outlet 506.

[0072] External ambient air enters the external connection cavity 503 directly from the air inlet / outlet 506, then flows upward and enters the hot end of the cooling and dehumidification module 200 through the top opening. After absorbing waste heat, it is discharged by the wind circulation module 300, completing the external circulation heat dissipation process.

[0073] This design highly integrates three major functions—internal air circulation intake, external air circulation intake, and condensate drainage—into a compact air intake and drainage box 501, resulting in an ingenious structure. The internal connecting cavity 502 and the external connecting cavity 503 are physically completely isolated, ensuring the absolute independence of the internal and external air circulation and avoiding cross-influence.

[0074] Using a 505 water-sealed bend as the drainage channel, its water-sealing properties ensure smooth drainage while permanently preventing external humid air, dust, or insects from flowing back into the enclosure through the drain pipe. This is key to ensuring the enclosure remains dry and clean for a long time.

[0075] As a single unit, this module is fixedly and sealed to the side wall of the enclosure and the bottom of the refrigeration and dehumidification module, which greatly reduces the number of openings to the outside of the system, simplifies the sealing process, significantly improves the overall protection level of the distribution box, and enhances its adaptability in outdoor high humidity and dusty environments.

[0076] Please refer to the above as well. Figures 1 to 9 In one specific embodiment of this application, the control system includes a controller and a temperature and humidity sensor installed inside the sealed housing 100. The controller is electrically connected to the temperature and humidity sensor, the semiconductor cooling chip 205 in the cooling and dehumidification module 200, the dual-shaft extension motor 302 in the wind circulation module 300, and the drive motor 405 in the condensate scraping module 400.

[0077] During operation, the control system achieves fully automated intelligent control from environmental perception to execution. Its core working principle is based on closed-loop feedback for on-demand operation and collaborative management. Temperature and humidity sensors continuously monitor the temperature and humidity parameters inside the sealed enclosure 100 and transmit the data to the controller in real time.

[0078] The controller has preset threshold logic for starting and stopping. When the humidity inside the chamber reaches the starting condition, the controller first starts the dual-shaft extension motor 302 of the air circulation module 300 to drive the internal and external circulation fans to operate and establish airflow. Subsequently, the controller supplies power to the semiconductor cooling chip 205 of the cooling and dehumidification module 200, so that its cold end begins to cool and dehumidify, and its hot end begins to dissipate heat.

[0079] The system dynamically adjusts the power of the thermoelectric cooler 205 based on feedback from temperature and humidity sensors; for example, PWM control is used to precisely maintain the required dry environment inside the chamber, avoiding energy waste or excessively low temperatures due to over-cooling. Simultaneously, the controller automatically activates the drive motor 405 of the condensate scraping module 400 at regular intervals or when a decrease in dehumidification efficiency is detected. This drives the scraper 402 to move up and down once, scraping away condensate from the cold-end heat exchange tank 212, ensuring continuous and efficient heat exchange. Once the humidity inside the chamber drops to a safe range, the controller sequentially shuts down the thermoelectric cooler 205 and delays the shutdown of the circulating fan, putting the system into a low-power standby state.

[0080] The control system automatically starts, stops, and adjusts based on the actual environmental conditions inside the box without manual intervention. It can continuously and proactively maintain the low humidity environment required by the electrical equipment inside the box, fundamentally preventing faults such as short circuits and flashovers caused by condensation, and greatly improving the operational safety and reliability of outdoor distribution boxes.

[0081] Furthermore, through sensor feedback and controller algorithms, precise on-demand adjustment of dehumidification power is achieved. This avoids energy waste associated with traditional timed or always-on modes, operating only at the necessary power when needed, significantly reducing overall system energy consumption and meeting energy conservation and environmental protection requirements.

[0082] The controller acts as a unified command center, coordinating the timing and logic of the three execution units: cooling, air circulation, and squeegee. For example, it ensures airflow before cooling starts to prevent localized icing; and it performs timed squeegeeing to maintain optimal efficiency. This collaborative management avoids conflicts or inefficient operation between components, optimizes the working state of each component, and helps extend the lifespan of the entire system.

[0083] In addition, the control system can be easily connected to higher-level power distribution automation systems or Internet of Things platforms by configuring standard electrical signal interfaces, thereby realizing remote monitoring of temperature and humidity inside the box, system operating status, fault alarms, and remote start-stop control, meeting the requirements of smart grid for intelligent equipment management.

[0084] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An outdoor anti-condensation distribution box suitable for high humidity environments, characterized in that: The system includes a sealed enclosure (100), inside which a refrigeration and dehumidification module (200) is installed. The refrigeration and dehumidification module (200) has a cold end and a hot end. A wind circulation module (300) is sealed and connected to the top of the refrigeration and dehumidification module (200). The wind circulation module (300) has an internal air outlet channel and an external air outlet channel. A condensate scraping module (400) is installed inside the refrigeration and dehumidification module (200) corresponding to the cold end. An air inlet and drainage module (500) is sealed and connected to the bottom of the refrigeration and dehumidification module (200). The air inlet and drainage module (500) has an internal air inlet channel and an external air inlet channel. The cold end is connected to the internal air inlet channel and the internal air outlet channel to form an internal circulation. The hot end is connected to the external air inlet channel and the external air outlet channel to form an external circulation. The refrigeration and dehumidification module (200), the wind circulation module (300), and the condensate scraping module (400) are connected to the same control system.

2. The outdoor anti-condensation distribution box suitable for high humidity environments according to claim 1, characterized in that: The cooling and dehumidifying module (200) includes at least one heat-insulating box (201), in which a semiconductor cooling chip (205) is sealed and installed. The cooling end and heating end of the semiconductor cooling chip (205) form the cold end and the hot end, respectively. The position near the top of the heat-insulating box (201) is connected to the air circulation module (300), and the position near the bottom of the heat-insulating box (201) is connected to the air inlet and drainage module (500).

3. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 2, characterized in that: The heat insulation box (201) is sealed with a cold end connecting pipe (206) and a hot end connecting pipe (207) near its top. The cold end connecting pipe (206) is sealed and connected to the cold end, and the hot end connecting pipe (207) is sealed and connected to the hot end. The cold end connecting pipe (206) is connected to the internal air outlet channel in the wind circulation module (300), and the hot end connecting pipe (207) is connected to the external air outlet channel in the wind circulation module (300).

4. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 2, characterized in that: The heat insulation box (201) has an internal air inlet and drain outlet (208) and an external air inlet and drain outlet (209) respectively located at its bottom. The air inlet and drain outlet module (500) is fixedly and sealed at the bottom of the heat insulation box (201). The internal air inlet and drain outlet (208) is connected to the internal air inlet channel, and the external air inlet and drain outlet (209) is connected to the external air inlet channel.

5. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 2, characterized in that: The cooling end of the semiconductor refrigeration chip (205) is fixedly installed with a cold end heat exchange plate (210), and the heating end of the semiconductor refrigeration chip (205) is fixedly installed with a hot end heat exchange plate (211). The cold end heat exchange plate (210) has multiple equidistantly distributed and vertically arranged cold end heat exchange grooves (212), and the hot end heat exchange plate (211) has multiple equidistantly distributed and vertically arranged hot end heat exchange grooves (213).

6. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 1, characterized in that: The wind circulation module (300) includes a blower duct (301), which is fixedly and sealed on the top surface of the sealed housing (100). A dual-shaft extension motor (302) is fixedly and sealed in the middle of the blower duct (301), and fan blades (303) are fixedly installed at both ends of the output shaft of the dual-shaft extension motor (302). A cold air circulation pipe (305) is sealed and connected to the outside of the blower duct (301) at a position inside the sealed housing (100). The cold air circulation pipe (305) connects the blower duct (301) and the cold end of the refrigeration and dehumidification module (200). A hot air circulation pipe (306) is sealed and connected to the outside of the blower duct (301) at a position outside the sealed housing (100). The hot air circulation pipe (306) connects the blower duct (301) and the hot end of the refrigeration and dehumidification module (200).

7. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 5, characterized in that: The condensate scraping module (400) includes a threaded shaft (401), which is rotatably connected to the inside of the cold end of the heat insulation box (201). A scraper (402) is slidably connected inside the cold end. The scraper (402) has a scraping groove (403) that matches the heat exchange groove (212) of the cold end. A threaded hole (404) is opened on the scraper (402) corresponding to the threaded shaft (401). The scraper (402) is threadedly connected to the threaded shaft (401) through the threaded hole (404). A drive motor (405) for driving the threaded shaft (401) is fixedly installed at the bottom of the heat insulation box (201).

8. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 1, characterized in that: The air intake and drainage module (500) includes an air intake and drainage box (501). The air intake and drainage box (501) has an internal connecting cavity (502) and an external connecting cavity (503). A water collection trough (504) is provided at the bottom of the internal connecting cavity (502). A water seal bend (505) is fixedly installed at the bottom of the water collection trough (504). The other end of the water seal bend (505) is sealed and connected to the external connecting cavity (503). The side wall of the housing (100) An air inlet and outlet (506) is provided corresponding to the external connecting cavity (503), and an internal air inlet (507) is provided near the water collection tank (504) in the internal connecting cavity (502). The internal connecting cavity (502) passes through the top of the air inlet and outlet box (501) and is connected to the cold end of the refrigeration and dehumidification module (200). The external connecting cavity (503) passes through the top of the air inlet and outlet box (501) and is connected to the hot end of the refrigeration and dehumidification module (200).

9. An outdoor anti-condensation distribution box suitable for high humidity environments according to claim 1, characterized in that: The control system includes a controller and a temperature and humidity sensor installed inside the sealed enclosure (100). The controller is electrically connected to the temperature and humidity sensor, the refrigeration and dehumidification module (200), the air circulation module (300), and the condensate scraping module (400).

10. An outdoor anti-condensation distribution box suitable for high humidity environments according to any one of claims 1-9, characterized in that: The front end of the sealed box (100) is rotatably connected to a sealed box door (101), and a sealing gasket (102) is fixedly installed on the sealed box door (101) corresponding to the front end of the sealed box (100). A top plate (104) is fixedly and sealed on the top of the sealed box (100), and a top cover (105) is installed on the top of the top plate (104). An electrical component mounting bracket (106) is fixedly connected to the inner side of the rear end of the sealed box (100). A wire hole (108) is opened on the bottom surface of the sealed box (100), and a sealing sleeve (109) is fixedly and sealed in the wire hole (108).

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