A box-type substation assembly with double heat dissipation modes

Abstract

This invention discloses a prefabricated substation assembly with dual heat dissipation modes, comprising: a base; a housing assembly including a transformer box, comprising a box body, a door, and a lock, the box body having three cavities: a high-voltage cavity, a transformer cavity, and a low-voltage cavity, each correspondingly connected to a door, the box body having a heat exhaust port, and the door having a cold inlet; a ventilation assembly including a ventilation shell and a heat-insulating piston; a telescopic assembly; and an opening and closing assembly. This prefabricated substation assembly with dual heat dissipation modes controls the raising and lowering of the heat-insulating piston through the telescopic assembly. In high-temperature weather, hot air from the transformer cavity is introduced into the hot air cavity while cold air from the cold air cavity is injected into the transformer cavity, reducing the transformer's operating environment temperature. In other weather conditions, cooling is achieved through the cold inlet and heat exhaust ports, venting hot air from the hot air cavity to the outside while introducing outside cold air into the cold air cavity for storage, to be used for cooling in high-temperature weather. This ensures cooling safety and energy efficiency, reduces maintenance costs, and extends service life.

Description

Technical Field

[0001] This invention relates to the field of power substation technology, and in particular to a prefabricated substation assembly with dual heat dissipation modes. Background Technology

[0002] Prefabricated substations are widely used in residential areas, industrial parks, and outdoor power distribution scenarios. The transformers inside generate heat during operation. Therefore, ventilation holes need to be opened on the prefabricated substations to facilitate the exhaust of hot air and the introduction of cool air from the outside for ventilation and heat dissipation, thereby reducing the internal temperature of the transformer room. However, during the summer daytime, since the outdoor temperature is also high and the temperature inside the transformer room is almost the same, the ventilation and cooling effect of the prefabricated substation during the summer daytime is extremely limited.

[0003] Based on the above, one of the mainstream methods for cooling transformer substations in summer is to install air conditioners in the transformer room for forced cooling. While this method can reduce the internal temperature of the transformer room to some extent, it has several inherent drawbacks: First, it lacks safety. Air conditioners contain complex components such as compressors, refrigerant pipelines, and electrical control boards, and refrigerant leaks or electrical component failures can easily lead to safety hazards. Second, it has high energy consumption. Air conditioners need to run continuously to maintain the cooling effect, resulting in high electricity costs over long-term use. Third, it has poor operational stability. In the high outdoor temperatures of summer, air conditioners are prone to high-voltage protection failures and shutdowns, significantly reducing their cooling capacity and failing to meet the continuous cooling requirements of the transformer. Finally, it has a short equipment lifespan. Outdoor exposure to sunlight and high temperatures accelerates the aging of air conditioner components, shortening their lifespan. Furthermore, it requires frequent maintenance, including regular manual cleaning, refrigerant replenishment, and electrical component inspection, increasing operating costs.

[0004] Therefore, it is necessary to improve the existing prefabricated substation technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a safe, stable, energy-saving, maintenance-free, and cost-reducing dual-heat dissipation mode prefabricated substation assembly.

[0006] To achieve the above-mentioned technical effects, the technical solution of the present invention is: a prefabricated substation assembly with dual heat dissipation modes, comprising: The base is horizontally fixed to the ground; The enclosure assembly includes a transformer box fixed to the base. The transformer box includes a body, a door rotating on the body, and a lock that locks the door to the body. The body has three cavities arranged in sequence: a high-voltage cavity for installing a high-voltage switchgear, a transformer cavity for installing a transformer, and a low-voltage cavity for installing a low-voltage switchgear. Each cavity is connected to the door. The locked door seals and covers the opening of the corresponding cavity. The body has a heat exhaust port, and the door has a cold inlet. The heat exhaust port and the cold inlet communicate with the lower part and the top of the corresponding cavity, respectively. Also includes: The ventilation assembly includes a ventilation shell pre-embedded underground and vertically arranged, and a heat-insulating piston sealed to the circumferential inner wall of the ventilation shell. The heat-insulating piston and the ventilation shell enclose an upper hot chamber and a lower cold chamber located below the upper cold chamber. The upper hot chamber and the lower cold chamber are respectively connected to a hot air pipe and a cold air pipe. The hot air pipe and the cold air pipe are respectively provided with a hot air valve and a cold air valve and are both connected to the pressure transformer chamber. The lower cold chamber is also fixedly connected to a cold inlet pipe. The cold inlet pipe is provided with a cold inlet valve and the end away from the lower cold chamber is located above the ground. The telescopic assembly drives the heat-insulating piston to move vertically within the ventilation housing; An opening and closing assembly is used to control the opening and closing of the heat exhaust port and the cold inlet port that are connected to the transformer cavity; Temperature sensors are installed both inside the transformer cavity and outside the transformer box.

[0007] Preferably, in order to reduce the mixing of cold air and hot air entering the transformer cavity and ensure that most of the hot air can be discharged when the cold air fills the transformer cavity, a heat-conducting pipe is provided in the transformer cavity. The bottom of the heat-conducting pipe is connected to the top of the hot air pipe, and there is a gap between the top of the heat-conducting pipe and the inner top wall of the transformer cavity. The cold air pipe is fixedly connected to the bottom of the transformer cavity.

[0008] Preferably, in order to ensure that the hot air located in the upper part of the transformer cavity can be introduced into the upper hot cavity and reduce the contact and mixing with cold air, the top of the heat-conducting shell is connected to a horizontal heat-conducting shell, and the outer circumferential edge of the heat-conducting shell is densely covered with hot air passages.

[0009] Preferably, in order to improve the cooling effect on the transformer, a flow divider is provided on the inner bottom wall of the transformer, which faces downward and is directly opposite the top of the cooling pipe. The top of the flow divider is densely covered with flow divider holes and the bottom is directly opposite and connected to the top of the cooling pipe. The flow divider is located directly below the transformer and there is a flow divider gap between it and the bottom of the transformer.

[0010] Preferably, in order to ensure that the cold air in the lower cooling cavity is at a low temperature, and to ensure the air storage capacity of the air exchange shell while avoiding excessive costs, the distance between the top of the air exchange shell and the ground is greater than or equal to 2m, and the height of the air exchange shell is 6-8m.

[0011] Preferably, in order to ensure structural compactness and the range of motion of the heat-insulating piston, the telescopic assembly includes two-stage electric push rods. The two-stage electric push rods are arranged downward and pass through the bottom of the housing and the base from top to bottom. The output end seals through the top of the ventilation shell and is connected to the heat-insulating piston. The top of the two-stage electric push rods is arranged adjacent to the inner top wall of the transformer chamber.

[0012] Preferably, to ensure the safe and stable operation of the device, the transformer box further includes a cover covering the top of the box body. The cover and the box body enclose three heat dissipation cavities corresponding to the three cavities directly above them. The bottom surface of the cover is provided with a heat dissipation opening located above the transformer box and separated from the transformer box. The heat dissipation opening is connected to the heat exhaust port through the corresponding heat dissipation cavity. The top of the cooling pipe is connected to a hollow cooling shell, and the bottom surface of the cooling shell is provided with a cooling extraction port.

[0013] Preferably, in order to ensure the stable opening and closing of the cold inlet and the heat outlet, the opening and closing assembly includes a cold inlet opening and closing unit for controlling the opening and closing of the cold inlet and a heat outlet opening and closing unit for controlling the opening and closing of the heat outlet.

[0014] Preferably, in order to reduce the ventilation and heat dissipation pressure of the transformer cavity, the transformer box has an interconnected mode and a separated mode. In the interconnected mode, the three cavities are connected, and in the separated mode, the three cavities are separated from each other.

[0015] Preferably, to facilitate rapid and stable switching between interconnected and isolated modes of the transformer box, the transformer box includes two partitions fixed inside the box body. Each of the two partitions has a cable-passing hole for cables to pass through. An air bladder is fixed to the circumferential inner wall of the cable-passing hole. The air bladder is connected to a bidirectional air pump. The bidirectional air pump drives the air bladder to switch back and forth between an inflated state and a contracted state. In the inflated state, the circumferential inner wall of the air bladder is sealed to the circumferential outer edge of the cable. In the contracted state, the circumferential inner wall of the air bladder and the cable form an annular ventilation gap.

[0016] In summary, compared with existing technologies, the dual-heat dissipation mode box-type substation assembly of this invention controls the lifting and lowering movement of the heat-insulating piston through telescopic components. In high-temperature weather, hot air from the transformer cavity is introduced into the hot air chamber while cold air from the cold air chamber is injected into the transformer cavity, ensuring that the transformer is at a suitable operating temperature. In other weather conditions, cooling is achieved through the cold inlet and hot outlet, and hot air from the hot air chamber is discharged to the outside while cold air from the outside is introduced into the cold air chamber for storage, which is used for cooling in high-temperature weather. This ensures the safety and energy efficiency of cooling, reduces maintenance costs, and has a long service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment; Figure 2 yes Figure 1 Cross-sectional structural diagram; Figure 3 This is a structural schematic diagram of the housing assembly in the first embodiment; Figure 4 yes Figure 3 An explosion diagram; Figure 5 This is a schematic diagram of the base plate of the first embodiment; Figure 6 This is a schematic diagram of the structure of the cabinet door in the first embodiment; Figure 7 yes Figure 6 An explosion diagram; Figure 8 yes Figure 7 Enlarged view of part A; Figure 9 yes Figure 3 Cross-sectional structural diagram; Figure 10 This is a schematic diagram of the ventilation assembly in the first embodiment; Figure 11 yes Figure 10 An explosion diagram; Figure 12 yes Figure 10 Cross-sectional structural diagram; Figure 13 This is a schematic diagram of the telescopic component in the first embodiment; Figure 14 yes Figure 13 An explosion diagram; Figure 15 yes Figure 14 Enlarged view of part B; Figure 16 This is a schematic diagram of the tube sleeve in the first embodiment; Figure 17 This is a structural schematic diagram of the housing assembly in the second embodiment; Figure 18yes Figure 17 Partial structural diagram; In the diagram: 1. Base; 2. Enclosure assembly; 21. Transformer box; 2101. Heat exhaust port; 2102. Cold inlet port; 211. Enclosure body; 212. Enclosure door; 213. Door lock; 214. Enclosure cover; 2141. Heat dissipation vent; 215. Base plate; 2151. Inspection port; 2152. Hot hole; 2153. Cold hole; 2154. Wiring hole; 2155. Through hole; 216. Enclosure frame; 217. Top plate; 2171. Fan; 218. Inspection cover; 219. Crossbeam; 22. Temperature sensor; 23. Heat pipe; 24. Heat-conducting shell; 241. Hot air vent; 25. Flow divider; 251. Flow divider hole; 26. Partition plate; 261. Wiring hole; 262. Airbag; 263. Two-way air pump; 27. Filter unit; 271. Louver; 2711. Insertion hole; 272. Filter screen; 2721. Insert post; 273. Magnet; 3. Ventilation assembly; 31. Ventilation shell; 311. Shell; 312. Shell lid; 313. Cooling cover; 32. Insulation unit Plug; 321, Sealing ring; 33, Hot air pipe; 331, Hot air valve; 34, Cold air pipe; 341, Cold air valve; 342, T-pipe; 35, Cold inlet pipe; 351, Cold inlet valve; 352, Cold inlet shell; 353, Cold extraction port; 36, Distance sensor; 4, Telescopic assembly; 41, Two-stage electric push rod; 411, Screw; 4111, Slide groove; 4112, First bearing; 412, Screw barrel; 4121, Slide bar; 4122, Inner threaded sleeve; 4123, Second bearing; 4 124. First guide bar; 413. Slide tube; 4131. Second guide bar; 414. Tube sleeve; 4141. Guide groove; 42. Drive unit; 421. Motor; 422. Drive gear; 423. Driven gear; 424. Synchronous pulley; 425. Synchronous belt; 5. Opening and closing assembly; 51. Cooling inlet opening and closing unit; 511. Cooling inlet cylinder; 512. Cooling inlet plate; 513. Limit bar; 52. Heat exhaust opening and closing unit; 521. Heat exhaust cylinder; 522. Heat exhaust cover; 6. Transformer. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] First Embodiment

[0020] like Figures 1-16 As shown, the dual-heat dissipation mode box-type substation assembly of the first embodiment of the present invention includes: Base 1 is horizontally fixed to the ground; The enclosure assembly 2 includes a transformer box 21 fixed on the base 1. The transformer box 21 includes a box body 211, a door 212 rotating on the box body 211, and a door lock 213 locking the door 212 to the box body 211. The box body 211 has three cavities arranged in sequence. The three cavities are a high-voltage cavity for installing a high-voltage cabinet, a transformer cavity for installing a transformer 6, and a low-voltage cavity for installing a low-voltage cabinet. Each cavity is connected to a door 212. The locked door 212 seals and covers the cavity opening of the corresponding cavity. The box body 211 is provided with a heat exhaust port 2101, and the door 212 is provided with a cold inlet 2102. The heat exhaust port 2101 and the cold inlet 2102 are respectively connected to the lower part and the top of the corresponding cavity. Also includes: The ventilation assembly 3 includes a ventilation shell 31 pre-embedded underground and vertically arranged, and a heat-insulating piston 32 sealed to the circumferential inner wall of the ventilation shell 31. The heat-insulating piston 32 and the ventilation shell 31 enclose an upper hot chamber and a lower cold chamber located below the upper cold chamber. The upper hot chamber and the lower cold chamber are respectively connected to a hot air pipe 33 and a cold air pipe 34. The hot air pipe 33 and the cold air pipe 34 are respectively provided with a hot air valve 331 and a cold air valve 341 and are both connected to a transformer chamber. The lower cold chamber is also fixedly connected to a cold inlet pipe 35. The cold inlet pipe 35 is provided with a cold inlet valve 351 and the end away from the lower cold chamber is located above the ground. The telescopic component 4 drives the heat-insulating piston 32 to move vertically within the ventilation housing 31; The opening and closing assembly 5 is used to control the opening and closing of the heat exhaust port 2101 and the cold inlet port 2102, which are connected to the transformer chamber; Temperature sensors 22 are installed both inside the transformer cavity and outside the transformer box 21.

[0021] The dual-heat dissipation mode box-type substation assembly of this embodiment has two working modes. The first working mode is mainly used for ventilation, heat dissipation and cooling except in high-temperature weather (usually the main time period is summer daytime, and for areas with large day-night temperature differences, such as deserts and Gobi, the main time period is daytime). The second working mode is used for ventilation, heat dissipation and cooling in relatively low-temperature weather (usually the main time period is any time in spring, autumn, and winter, as well as summer nighttime, and for areas with large day-night temperature differences, such as deserts and Gobi, the main time period is nighttime).

[0022] Specifically, in the first operating mode, the external ambient temperature is relatively low. The opening and closing component 5 controls the heat exhaust port 2101 and the cold inlet port 2102 to open, while keeping the hot air valve 331, cold air valve 341 and cold inlet valve 351 closed. This allows the three chambers, namely the high-voltage chamber, the transformer chamber and the low-voltage chamber, to be connected to the outside through the cold inlet port 2102 and the heat exhaust port 2101. The cold inlet port 2102 is connected to the lower part of the corresponding chamber, and the heat exhaust port 2101 is connected to the top of the corresponding chamber. This causes the high-voltage cabinet, low-voltage cabinet and transformer 6 inside the transformer box 21 to generate heat during operation. After the ambient temperature inside the corresponding chamber rises, the hot air flows upward and is discharged from the chamber through the heat exhaust port 2101. Meanwhile, as the cold air from outside enters the chamber through the cold inlet port 2102, the relatively low ambient temperature ensures that the chamber is kept at a low temperature, thereby ensuring the safe operation of the high-voltage cabinet, low-voltage cabinet and transformer 6.

[0023] In the second operating mode, the external ambient temperature is relatively high, which is usually during the summer daytime. The opening and closing component 5 controls the heat exhaust port 2101 and cold inlet port 2102 corresponding to the transformer cavity to close, while the heat exhaust port 2101 and cold inlet port 2102 corresponding to the other cavities are opened. This is because the heat generated by the low-voltage cabinet and high-voltage cabinet during operation is much less than the heat generated by the transformer 6 during operation. By introducing external air into the high-voltage cavity and low-voltage cavity through the cold inlet port 2102, and expelling the hot air in the high-voltage cavity and low-voltage cavity through the heat exhaust port 2101, the high-voltage cabinet and low-voltage cabinet can be ventilated and cooled to meet the cooling requirements.

[0024] The transformer chamber is isolated from the outside world. In this state, the hot air valve 331 and the cold air valve 341 are opened and the cold air inlet valve 351 is closed. The telescopic component 4 controls the heat-insulating piston 32 in the air exchange shell 31 to move downward a certain distance. Since the air exchange shell 31 is buried underground, the underground ambient temperature is generally lower than the surface ambient temperature during the day (initially, the heat-insulating piston 32 is located at the top of the air exchange shell 31, and the volume of the lower cold chamber is much larger than the volume of the upper hot chamber to ensure that there is enough cold air in the lower cold chamber). As the heat-insulating piston 32 moves downward, the volume of the upper hot chamber increases and the air pressure decreases, while the volume of the lower cold chamber decreases and the air pressure increases. In this way, the hot air in the transformer chamber is introduced into the upper hot chamber through the hot air pipe 33, while the cold air in the lower cold chamber is forced into the transformer chamber through the cold air pipe 34. This allows the cold air to replace the hot air and fill the transformer chamber, reducing the temperature in the transformer chamber. Then, the hot air valve 331 and the cold air valve 341 are closed. Transformer 6 operates in a low-temperature environment for a certain period. The temperature sensor 22 inside the transformer cavity detects the operating environment temperature of transformer 6. When the operating environment temperature exceeds the preset high temperature, the hot air valve 331 and cold air valve 341 are opened. The telescopic assembly 4 controls the heat-insulating piston 32 inside the air exchange shell 31 to move downwards a certain distance. This allows hot air from the transformer cavity to continue being introduced into the upper hot cavity while cold air from the lower cold cavity is forced into the transformer cavity. Then, the hot air valve 331 and cold air valve 341 are closed. In this way, by using the temperature sensor 22 to detect the internal ambient temperature of the transformer cavity and the telescopic assembly 4 to drive the heat-insulating piston 32 to move downwards intermittently, transformer 6 is kept in a relatively low operating environment for a long period, ensuring its safe and stable operation.

[0025] During summer nights or the rest of spring, autumn, and winter, when the outside temperature is generally lower than the summer daytime temperature, the hot air valve 331, cold air valve 341, and cold air inlet valve 351 are closed. The opening and closing assembly 5 controls the opening of the heat exhaust port 2101 and the cold air inlet 2102, allowing outside air to be introduced into the three chambers through the cold air inlet 2102 while hot air inside the chambers is exhausted to the outside through the heat exhaust port 2101. This air convection achieves ventilation, heat dissipation, and cooling of the three chambers. The outside temperature is monitored by the temperature sensor 22 outside the transformer box 21. When the outside air temperature falls below the preset low temperature by the staff, the same... When the inlet valve 351 and hot air valve 331 are opened, the lower cooling chamber is connected to the outside through the inlet pipe 35. Then, the telescopic assembly 4 drives the heat-insulating piston 32 to move upward, reducing the volume of the upper hot chamber and increasing the volume of the lower cooling chamber. The hot air in the upper hot chamber enters the transformer chamber through the hot air pipe 33 and flows upward, being discharged to the outside through the upper heat exhaust port 2101. Simultaneously, cold air from the outside enters the lower cooling chamber through the inlet pipe 35 until the heat-insulating piston 32 moves to the top of the ventilation housing 31, ensuring sufficient space in the lower cooling chamber to accommodate a sufficient amount of cold air for cooling the transformer chamber in hot weather. After the heat-insulating piston 32 moves to the top of the ventilation housing 31, the inlet valve 351 and hot air valve 331 are closed.

[0026] The heat-insulating piston 32 divides the inner cavity of the air exchange shell 31 into an upper hot cavity and a lower cold cavity. The heat-insulating piston 32 can prevent heat exchange between the upper hot cavity and the lower cold cavity, so as to ensure that the air in the lower cold cavity is at a low temperature.

[0027] Compared with existing cooling technologies, the cooling method in this embodiment has the following advantages: First, in this embodiment, cold air is temporarily stored in the lower cold cavity of the ventilation shell 31, which is pre-buried underground, for use in cooling the transformer cavity in hot weather. The hot air generated in the transformer cavity is introduced into the upper hot cavity of the ventilation shell 31. In cold weather, the hot air in the upper hot cavity is discharged to the outside while cold air from the outside is introduced into the lower cold cavity in preparation for cooling in hot weather. Therefore, compared with air conditioning, no refrigerant is needed, avoiding the risk of leakage and electrical short circuits and other safety issues. It can be adapted to the cooling of transformer 6 in hot weather, ensuring the safe and stable operation of the box-type substation. Secondly, the dual-heat dissipation mode box-type substation assembly utilizes external cold air temporarily stored in the lower cooling cavity for use on transformer 6 in hot weather. No additional cooling equipment is required; only the movement of the heat-insulating piston 32 is controlled by the telescopic component 4. Therefore, the power consumption of this embodiment mainly comes from driving the heat-insulating piston 32 to move up and down, as well as the operation of the opening and closing component 5 and the switching of valves such as hot air valve 331, cold air valve 341, and cold inlet valve 351. Compared with the additional cooling devices such as air conditioners in the prior art, the energy consumption is extremely low, significantly reducing operating costs and thus achieving energy saving. Furthermore, in this embodiment, the ventilation shell 31 is pre-buried underground, and the soil temperature underground is not affected by direct sunlight in hot weather, and remains constant. No matter how high the outside temperature rises, this embodiment can replace the hot air in the transformer cavity with cold air prepared in advance in low-temperature weather, and ensure that the transformer 6 is always in a low-temperature working environment through the intermittent descent of the heat insulation piston 32. This effectively solves the problem of reduced cooling capacity and easy shutdown of air conditioners in high-temperature environments in the prior art, and ensures a stable cooling effect. Therefore, it is also suitable for some areas with large temperature differences between day and night, such as deserts. Finally, this embodiment only needs to ensure the normal and stable operation of valves such as the telescopic component 4, the opening and closing component 5, the hot air valve 331, the cold air valve 341, and the cold inlet valve 351 to ensure the normal cooling of the transformer chamber. Compared with using air conditioning for cooling, the above components can reduce exposure to sunlight, extend their service life, and have no consumables, no refrigerant, and no need for regular cleaning and refrigerant addition. This can significantly increase the maintenance cycle and correspondingly extend the service life of the box-type substation assembly with dual heat dissipation mode.

[0028] Specifically, such as Figure 3 and Figure 4 As shown, the base 1 in this embodiment is a cement block, which has a rectangular frame structure, making it convenient for cables buried underground to be connected to the facilities in the transformer box 21 through the inside of the base 1.

[0029] The transformer box 21 includes a horizontally rectangular base plate 215 with the same length and width as the base 1, a frame 216 fixed to the base plate 215, and three top plates 217 fixed to the top of the frame 216 and distributed along the length of the base plate 215. Two partitions 26 are fixed to the inner side of the frame 216 and are distributed vertically along the length of the base plate 215. The partitions 26 and the top plates 217 are spaced apart and fixedly connected, so that the base plate 215, the frame 216, and the top plates 217 enclose three cavities. Among the three cavities, the cavity in the middle, i.e. the transformer cavity, has two openings facing away from each other along the width of the base plate 215. The center of the base plate 215 is used to fix and install the transformer 6. The cavities at both ends, i.e. the high-voltage cavity and the low-voltage cavity, each have three openings, two of which are facing away from each other along the width of the base plate 215, and the other opening is facing away from the transformer cavity.

[0030] The partition 26 is provided with several wire holes 261 for cables to pass through, so as to realize the electrical connection between the transformer 6 in the transformer chamber, the high-voltage cabinet in the high-voltage chamber, and the low-voltage cabinet in the low-voltage chamber.

[0031] Each top plate 217 has a heat exhaust port 2101 at its center for exhausting hot air from the cavity upwards. The heat exhaust port 2101 has a cylindrical structure with a vertical axis and a fan 2171 inside. The fan 2171 can force airflow, increase air circulation, and facilitate forced ventilation and heat dissipation inside the cavity when the external ambient temperature is relatively low, thereby improving the cooling effect.

[0032] Each cavity is connected to a sealing unit to control the opening and closing of each cavity. Specifically, for example... Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the enclosed unit includes two vertically arranged doors 212 that are rotatably connected to the frame 216. The rotation axis of the two doors 212 extends along the vertical direction and is locked and fixed to the frame 216 by door locks 213. In the locked state, the two doors 212 are on the same vertical plane and seal the cavity opening. In the unlocked state, the doors 212 can rotate, making it easy to open the cavity opening and maintain the electrical facilities inside the cavity.

[0033] The enclosure door 212 is provided with a square cold inlet 2102, which is used to introduce external cold air into the corresponding cavity when the enclosure door 212 is locked and fixed. The cold inlet 2102 is provided with a filter unit 27, which is used to filter impurities such as dust particles, mosquitoes, and rainwater in the cold air to ensure the stable operation of electrical facilities (high voltage cabinet, low voltage cabinet, transformer 6, etc.) in the cavity.

[0034] Specifically, the filter unit 27 includes a louver 271 and a filter screen 272 arranged sequentially along the direction of cold air flow. The outer edge of the outer frame of the louver 271 is fixedly connected to the inner wall of the cold inlet 2102. The filter screen 272 is detachably fitted to the air outlet side of the louver 271. More specifically, in order to facilitate the quick disassembly and connection of the filter screen 272 and the louver 271, the four corners of the outer frame of the louver 271 near the cavity are provided with insertion holes 2711, and the four corners of the filter screen 272 are provided with insertion posts 2721 that are fitted and connected to the insertion holes 2711 one by one. To ensure a stable connection between the filter screen 272 and the louver 271, a notch is provided on the side of the outer frame of the louver 271 adjacent to the cavity. A magnet 273 is fixedly housed in the notch. The magnet 273 magnetically engages with the outer frame of the filter screen 272 to prevent the filter screen 272 from detaching from the louver 271 without external force.

[0035] like Figure 5 As shown, the base plate 215 has three wiring holes 2154 fixed along its length. The wiring holes 2154 are located on the upper inner side of the base 1, allowing cables to connect to the transformer 6, the high-voltage switchgear, and the low-voltage switchgear. The base plate 215 also has an inspection port 2151, a hot hole 2152, and a cold hole 2153, all located on the upper inner side of the base 1. Specifically, the inspection port 2151 is connected to the bottom of the low-voltage chamber. An inspection cover 218 is provided on the inspection port 2151, and the inspection cover 218 is rotatably connected to the base plate 215. Normally, the inspection cover 218 covers the inspection port 2151. When maintenance workers need to perform maintenance, they can enter the low-voltage chamber through the door 212 at the entrance of the low-voltage chamber, which is opposite to the transformer chamber. Rotate the inspection cover 218 upwards to enter the underground maintenance channel through the inner side of the base 1 and carry out maintenance work on the wiring below the base plate 215; the bottom end of the hot hole 2152 is connected to the hot air pipe 33, which facilitates the introduction of hot air from the transformer cavity into the upper hot cavity through the hot hole 2152 and the hot air pipe 33 in high temperature weather, and the introduction of hot air from the upper hot cavity into the transformer cavity through the hot air pipe 33 and the hot hole 2152 in relatively low temperature weather, and then the air is discharged through the heat exhaust port 2101 at the top of the transformer cavity; the cold hole 2153 is connected to the top end of the cold air pipe 34, so that the cold air from the lower cold cavity can be discharged into the transformer cavity through the cold air pipe 34 and the cold hole 2153 in sequence by the downward movement of the heat insulation piston 32.

[0036] like Figures 10-12 As shown, in this embodiment, the ventilation shell 31 is generally rectangular and extends in the vertical direction. The heat insulation piston 32 is covered with an elastic sealing ring 321, which is preferably a rubber ring, to ensure a sealed connection between the heat insulation piston 32 and the circumferential inner wall of the ventilation shell 31, reduce the heat exchange between the hot air in the upper hot cavity and the cold air in the lower cold cavity, and ensure that the cold air in the lower cold cavity is kept at a low temperature during long-term temporary storage.

[0037] The ventilation housing 31 includes a shell 311 with an open top and a cover 312 fixedly placed on top of the shell 311. A distance sensor 36 is provided below the cover 312, facing the heat insulation piston 32, to detect the movement distance of the heat insulation piston 32 each time it descends. This ensures that after each descent of the heat insulation piston 32, some of the cold air in the lower cooling chamber can fill the transformer chamber, while avoiding excessive descent distance of the heat insulation piston 32 each time, which would result in excessive use of cold air and make the cold air in the ventilation housing 31 insufficient for cooling the transformer 6 in the transformer chamber during prolonged high-temperature weather.

[0038] A cooling shroud 313 is provided on the top of the barrel lid 312. The cooling shroud 313 and the barrel lid 312 enclose a cooling cavity. The bottom end of the cooling pipe 34 is connected to the top of the cooling cavity. The barrel 311 is also fixedly connected to a three-way pipe 342. One end of the three-way pipe 342 is connected to the bottom of the lower cooling cavity, and the other two ends are connected to the two ends of the cooling cavity and are respectively connected to cooling valves 341. Both ends are also fixedly connected to a cooling inlet pipe 35. The connection between the cooling inlet pipe 35 and the three-way pipe 342 is located on the side of the cooling valve 341 away from the cooling cavity.

[0039] With the above structure, the hot air valve 331 and cold air valve 341 are opened, and the cold inlet valve 351 is closed. After the heat-insulating piston 32 moves down, the cold air in the lower cold chamber is divided into two paths, entering the cooling shroud 313 through both ends of the three-way pipe 342. After merging in the cooling shroud 313, it flows upward from the top cold air pipe 34 and enters the transformer chamber. At the same time, the hot air in the transformer chamber flows downward along the hot air pipe 33 after passing through the hot holes 2152 on the bottom plate 215, entering the upper cold chamber. The cold air valve 341 is closed, and the cold inlet valve 351 is opened. 1. The heat-insulating piston 32 flows upward in the shell 311. At this time, the hot air in the upper hot chamber flows upward along the hot air pipe 33, enters the transformer chamber through the hot hole 2152, and then flows upward and is discharged from the heat exhaust port 2101. Meanwhile, the external cold air enters the cooling pipe 35, enters the three-way pipe 342 through the cooling pipe 35, flows along the side of the three-way pipe 342 away from the cooling valve 341, and enters the lower cold chamber, so that the lower cold chamber temporarily stores low-temperature gas for cooling the transformer 6 in hot weather.

[0040] A further improvement is that a heat pipe 23 is installed inside the transformer chamber, the bottom of the heat pipe 23 is connected to the top of the hot air pipe 33, the top of the heat pipe 23 is spaced from the inner top wall of the transformer chamber, and the cold air pipe 34 is fixedly connected to the bottom of the transformer chamber.

[0041] With this design, after the heat-insulating piston 32 moves downward, the hot air at the top of the transformer cavity can flow downward along the heat-conducting pipe 23, while the cold air begins to accumulate from the bottom of the transformer cavity. This avoids the hot air outlet and the cold air inlet being too close, which would cause the hot and cold air to come into contact and exchange heat, resulting in a decrease in the cooling effect on the transformer 6 after the cold air temperature rises. Moreover, after the heat-insulating piston 32 moves upward, the hot air in the upper heating cavity flows upward and directly to the top wall of the transformer cavity, ensuring that the hot air outlet is far from the transformer 6 and close to the heat exhaust port 2101. This facilitates the rapid discharge of the hot air from the upper heating cavity through the heat exhaust port 2101, avoiding contact with the transformer 6 and heat exchange, which would cause the transformer 6 to heat up.

[0042] A further improvement is that the top of the heat-conducting shell 24 is connected to a horizontal heat-conducting shell 24, and the outer circumferential edge of the heat-conducting shell 24 is densely covered with hot air passages 241.

[0043] With this design, the heat-conducting shell 24 expands the absorption and diffusion range of hot air at the top of the transformer cavity, which facilitates the rapid absorption of hot air at the top of the transformer cavity after the heat-insulating piston 32 descends, and diffuses hot air to the top of the transformer cavity when the heat-insulating piston 32 rises, so that the hot air at the top can be discharged from the heat exhaust port 2101.

[0044] Specifically, such as Figure 4 and Figure 9 As shown, the heat pipe 23 extends vertically, with its bottom fixedly connected to the heat hole 2152 of the base plate 215, and its top fixedly connected to the barrel-shaped heat-conducting shell 24. The heat-conducting shell 24 is fixed below the corresponding top plate 217 to form a heat-conducting cavity with the top plate 217, which facilitates the flow of hot air.

[0045] A further improvement is that a diversion shroud 25 is provided on the inner bottom wall of the transformer, facing downward and directly opposite the top of the cooling pipe 34. The top of the diversion shroud 25 is densely covered with diversion holes 251 and the bottom is directly connected to the top of the cooling pipe 34. The diversion shroud 25 is located directly below the transformer 6 and there is a diversion gap between it and the bottom of the transformer.

[0046] Specifically, such as Figure 4 and Figure 9As shown, the distribution shroud 25 is fixed above the base plate 215. The distribution shroud 25 is a cylindrical shape with an open bottom, covering the cold hole 2153. A support bar is provided below the transformer 6, and the support bar is fixed above the base plate 215. The support bar increases the bottom height of the transformer 6, so that while the transformer 6 is above the distribution shroud 25, there is a flow-dividing gap between the transformer 6 and the top of the transformer 6. With this design, when the heat insulation piston 32 moves down, the cold air in the lower cold chamber passes sequentially through the three-way pipe 342, the cold collection shroud 313, the cold air pipe 34, the cold hole 2153, and the distribution shroud 25, and is discharged upward from the top flow-dividing hole 251. It contacts the bottom of the transformer 6 through the flow-dividing gap, thereby increasing the heat exchange contact area between the cold air and the transformer 6 and improving the cooling and heat dissipation effect of the transformer 6.

[0047] A further improvement is that the transformer box 21 also includes a cover 214 covering the top of the box body 211. The cover 214 and the box body 211 enclose and form three heat dissipation cavities corresponding to the three cavities directly above them. The bottom surface of the cover 214 is provided with a heat dissipation port 2141 located above the transformer box 21 and separated from the transformer box 21. The heat dissipation port 2141 is connected to the heat exhaust port 2101 through the corresponding heat dissipation cavity. The top of the cooling pipe 35 is connected to a hollow cooling shell 352, and the bottom surface of the cooling shell 352 is provided with a cooling extraction port 353.

[0048] By adopting the above design, rainwater can be prevented from entering the cavity through the heat dissipation port 2101 and the lower cooling cavity through the cooling inlet pipe 35 during rainy days. This ensures the dryness of the cavity and the interior of the air exchange shell 31, and guarantees the normal and stable operation of the box-type substation assembly with dual heat dissipation mode.

[0049] Specifically, such as Figure 3 and Figure 9 As shown, the cover 214 is fixed directly above the frame 216, and the bottom of the cover 214 has a flange. The flange is located on the top outer side of the body 211, and the heat dissipation vents 2141 are distributed around the flange. In this way, air enters the cavity through the cold inlet 2102 of the door 212, exchanges heat with the internal electrical facilities, and the temperature rises to form hot air. The hot air flows upward and enters the corresponding heat dissipation cavity through the heat dissipation vents 2141 of the top plate 217. Then it is discharged downward from the heat dissipation vents 2141 of the flange. The heat dissipation vents 2141 are blocked by the top of the cover 214 to prevent rainwater from entering.

[0050] like Figure 12As shown, the end of the cooling pipe 35 away from the shell 311 extends upward, and the top is fixedly connected to a horizontal and hollow cooling shell 352. The bottom surface of the cooling shell 352 is provided with a cooling port 353. The cooling port 353 is located above the ground, so that after the heat insulation piston 32 moves upward, the cold air on the ground can enter the cooling shell 352 through the cooling port 353, and then enter the lower cooling cavity through the cooling pipe 35. The cooling port 353 faces downward and is blocked by the top of the cooling shell 352, preventing rainwater from flowing into the cooling pipe 35.

[0051] A further improvement is that the opening and closing assembly 5 includes a cold inlet opening and closing unit 51 for controlling the opening and closing of the cold inlet 2102 and a heat exhaust opening and closing unit 52 for controlling the opening and closing of the heat exhaust port 2101.

[0052] This design allows for convenient and independent control of the opening and closing of the cold inlet 2102 and the heat outlet 2101.

[0053] Specifically, such as Figure 4 and Figure 9 As shown, four cooling inlet opening and closing units 51 are provided, each corresponding to one of the four boxes 212 corresponding to the transformer chamber. Each cooling inlet opening and closing unit 51 includes a cooling inlet cylinder 511, a cooling inlet plate 512, and a limiting strip 513. The cylinder barrel of the cooling inlet cylinder 511 is vertically downward and fixed to the inside of the box 212. The cooling inlet plate 512 is vertically arranged, with its side near the box 212 and the side of the filter screen 272 facing away from the louvers 271 located on the same vertical plane. The piston rod of the cooling inlet cylinder 511 is fixedly connected to the cooling inlet plate 512. The limiting strip 513 extends vertically and is fixed to the box 212. 13 are respectively set on both sides of the cold inlet 2102. The two limiting strips 513 and the door 212 form a limiting groove with opposite openings. The two sides of the cold inlet plate 512 slide with the limiting groove to ensure that the cold inlet cylinder 511 controls the cold inlet plate 512 to move stably in the vertical direction. When the cold inlet plate 512 moves to the bottom position, the cold inlet plate 512 seals and covers the filter screen 272 and blocks the cold inlet 2102, so that the cold inlet 2102 is closed. After the cold inlet plate 512 moves upward to the side above the cold inlet 2102, it can fully open the cold inlet 2102, so that the external cold air can enter the transformer chamber through the cold inlet 2102.

[0054] The heat dissipation opening and closing unit 52 includes a heat dissipation cylinder 521 and a heat dissipation cover 522. The cylinder of the heat dissipation cylinder 521 is vertically downward and fixed above the cover 214. The heat dissipation cover 522 is located directly above the heat dissipation port 2101 of the top plate 217. The bottom end of the piston rod of the heat dissipation cylinder 521 is sealed through the top of the cover 214 and fixedly connected to the heat dissipation cover 522. The heat dissipation cover 522, the heat dissipation cylinder 521 and the heat dissipation port 2101 are coaxial. With the above design, the heat exhaust cover 522 is raised and lowered by the heat exhaust cylinder 521. After the heat exhaust cover 522 moves downward to contact the top plate 217, its bottom is sealed to the top of the heat exhaust port 2101, thereby blocking the heat exhaust port 2101. In conjunction with the cold inlet opening and closing unit 51, the cold inlet port 2102 is closed, so that the transformer chamber is isolated from the outside. Then, the heat insulation piston 32 descends to introduce the hot air in the transformer chamber into the upper hot chamber. At the same time, the cold air in the lower cold chamber enters the transformer chamber to cool the transformer 6. After the heat exhaust cover 522 moves upward by the heat exhaust cylinder 521, there is a certain heat exhaust gap between it and the top plate 217, which allows the hot air to pass through the heat exhaust port 2101 and enter the heat dissipation chamber, and then be discharged to the outside through the heat dissipation port 2141.

[0055] A further improvement is that the distance between the top of the ventilation shell 31 and the ground is greater than or equal to 2m, and the height of the ventilation shell 31 is 6-8m. In this embodiment, the distance between the top of the ventilation shell 31 and the ground is 2m, and the height of the ventilation shell 31 is 7m.

[0056] While the temperature at a depth of 0-2 meters underground is typically lower than the surface temperature during the day, it is still susceptible to temperature fluctuations, particularly in summer. Below 2 meters, the temperature remains relatively stable at 10-15°C year-round, ensuring that the air in the lower cooling chamber of the ventilation shell 31 is kept at a low temperature and is less affected by surface temperatures, thus effectively cooling the transformer 6. Setting the height of the ventilation shell 31 to 7 meters ensures sufficient capacity to hold a large amount of cold air for cooling the transformer 6 within the transformer cavity during hot weather. On the other hand, it can reduce construction costs. Ordinary drilling rigs can drill holes on the ground, which is convenient for pre-installing the air exchange shell 31, reducing the initial cost and shortening the construction period. It does not require professional drilling equipment, and the structure is safe and not easy to collapse. It is also conducive to shortening the length of the cold air pipe 34 and the hot air pipe 33, which facilitates air circulation and reduces losses. In addition, the temperature drop trend is extremely slow at deeper depths below the surface, while the cost of pre-installing the drilling rig increases significantly with the pre-installation depth. Therefore, in this embodiment, the distance between the top of the air exchange shell 31 and the ground is designed to be 2m, and the height of the air exchange shell 31 is designed to be 7m.

[0057] A further improvement is that the telescopic assembly 4 includes two-stage electric push rods 41, which are arranged downwards and pass through the bottom of the housing 211 and the base 1 from top to bottom. The output end is sealed through the top of the ventilation shell 31 and connected to the heat insulation piston 32. The top of the two-stage electric push rods 41 is arranged close to the inner top wall of the transformer chamber.

[0058] In this embodiment, the height of the transformer cavity (i.e., the height difference between the bottom plate 215 and the top plate 217) is 2.5m, while the height of the base 1 is 0.3m, and the height distance between the ventilation shell 31 and the ground is 2m. Therefore, the distance between the top plate 217 and the top of the ventilation shell 31 is 4.8m, which is less than the height dimension of the ventilation shell 31, but greater than half of the height dimension of the ventilation shell 31. Two-stage electric push rods 41 are used, and the top of the two-stage electric push rods is close to the bottom of the top plate 217. After the output end is fixedly connected to the heat insulation piston 32, it is ensured that the heat insulation piston 32 has enough movement distance to move back and forth between the top and bottom of the ventilation shell 31, ensuring that the upper hot cavity and the lower cold cavity have enough capacity to accommodate enough cold air to cool the transformer 6, and to accommodate enough hot air.

[0059] Specifically, such as Figure 5 and Figure 13 As shown, the base plate 215 has two through holes 2155, located on both sides of the cooling hole 2153, as follows. Figure 2 As shown, the telescopic assembly 4 includes a drive unit 42 and two two-stage electric push rods 41. The two two-stage electric push rods 41 are fixedly inserted through two through holes 2155 respectively. The drive unit 42 is used to control the output ends of the two electric push rods 41 to move synchronously, with the same amplitude and direction, so as to drive the heat insulation piston 32 to move smoothly up and down in the ventilation shell 31.

[0060] like Figures 14-16 As shown, the two-stage electric push rod 41 includes a screw 411, a screw barrel 412, a slide tube 413, and a sleeve 414, which are coaxial from the inside out and extend vertically. The drive unit 42 drives the screw 411 to rotate around its own axis. The sleeve 414 is fixedly connected to the two partitions 26 respectively, and its circumferential outer edge is fixedly connected to the circumferential inner wall of the through hole 2155, and extends downward to the space between the base 1 and the ventilation shell 31. The inner wall of the sleeve 414 is provided with a guide groove 4141 extending axially. The circumferential outer edge of the slide tube 413 is fitted to the circumferential inner wall of the sleeve 414, and its axial outer edge is provided with a second guide bar 4131 that slides in a one-to-one correspondence with the guide groove 4141 to restrict the slide tube 413 to slide only along its own axis. The bottom end of the slide tube 413 is sealed through the cooling cover 313 and the barrel cover 312 and is fixedly connected to the top surface of the heat insulation piston 32.

[0061] The top of the screw 411 passes through the top of the sleeve 414 and is connected to the output end of the drive unit 42. The outer surface of the screw 411 is provided with a first external thread and a through groove 4111 extending along its axial direction. The screw 411 is fitted with a first bearing 4112. The outer ring and inner ring of the first bearing 4112 are fixedly connected to the screw 411 and the sleeve 414 respectively to ensure that the screw 411 can rotate stably around its own axis after the drive unit 42 is running.

[0062] The inner circumferential wall of the screw barrel 412 is provided with a slide bar 4121 extending along its axial direction. The slide bar 4121 and the slide groove 4111 are slidably engaged in a one-to-one correspondence. In this way, the radial fixed connection and axial sliding connection between the screw barrel 412 and the screw 411 can be easily realized. The top end of the screw barrel 412 is rotatably connected to the inner thread sleeve 4122 through the second bearing 4123. The inner thread sleeve 4122 is threadedly connected to the first external thread. The outer circumferential edge of the inner thread sleeve 4122 is provided with a first guide bar 4124 extending along its axial direction. The first guide bar 4124 and the guide groove 4141 are slidably engaged in a one-to-one correspondence. The outer circumferential edge of the screw barrel 412 is provided with a second external thread. The second external thread is threadedly connected to the inner circumferential wall of the slide tube 413.

[0063] Thus, when the screw 411 rotates, it acts on the inner thread sleeve 4122 through the first external thread, causing the inner thread sleeve 4122 to drive the screw barrel 412 to move axially through the second bearing 4123. At the same time, it acts on the slide bar 4121 through the inner wall of the slide groove 4111, causing the screw barrel 412 to rotate synchronously while moving axially. The second external thread on the outer surface of the screw barrel 412 acts on the slide tube 413. Under the sliding cooperation of the second guide bar 4131 and the guide groove 4141, the slide tube 413 moves smoothly along its own axis, thereby realizing the lifting and lowering movement of the heat insulation piston 32.

[0064] The drive unit 42 includes a motor 421, a drive gear 422, a driven gear 423, a synchronous belt 425, and two synchronous pulleys 424. Specifically, the motor 421 is fixed on one of the sleeves 414 and is oriented upwards. The output end of the motor 421 is fixedly connected to the drive gear 422 along the same axis. The driven gear 423 meshes with the drive gear 422 and its bottom surface is fixedly connected to one of the synchronous pulleys 424 along the same axis. The two synchronous pulleys 424 are respectively fixed to the top ends of two screws 411 along the same axis and are connected by the synchronous belt 425.

[0065] With the above structure, the motor 421 starts and drives the drive gear 422 to rotate, which in turn drives the driven gear 423 that meshes with it to rotate, thereby driving one of the synchronous pulleys 424 to rotate. Under the action of the synchronous belt 425, the other synchronous pulley 424 rotates. The two synchronous pulleys 424 have the same outer diameter, so that the speed and direction of the two screws 411 are consistent. Then, the drive unit 42 controls the slide tubes 413 of the two two-stage electric push rods 41 to move synchronously.

[0066] Of the two temperature sensors 22, one is fixed to the top of the heat dissipation cylinder 521 to monitor the external ambient temperature, while the other is fixed inside the transformer chamber via a crossbeam 219. The two ends of the crossbeam 219 are respectively fixedly connected to two sleeves 414. The temperature sensor 22 is located above the transformer 6 and is used to monitor the ambient temperature inside the transformer chamber.

[0067] Second Embodiment

[0068] like Figure 17 and Figure 18 As shown, the dual-heat dissipation mode box-type substation assembly of the second embodiment of the present invention is based on the first embodiment. The substation box 21 has an interconnection mode and a separation mode. The three cavities in the interconnection mode are connected, and the three cavities in the separation mode are separated from each other.

[0069] Specifically, when the ambient temperature is low, the dual-heat dissipation mode box-type substation assembly of this embodiment operates in the first mode. At this time, the substation 21 is switched to the interconnection mode, so that the high-voltage chamber, transformer chamber, and low-voltage chamber are connected in sequence. Since the transformer chamber heats up quickly, while the high-voltage and low-voltage chambers heat up relatively slowly, the interconnection mode can reduce the natural ventilation pressure. That is, in the first operating mode, the fan 2171 forces ventilation to dissipate heat, allowing the hot air in the transformer chamber to enter the high-voltage and low-voltage chambers before exiting through the corresponding heat exhaust port 2. The discharge of 101 ensures uniform and consistent heat dissipation and cooling of the three cavities, reducing the heat dissipation and cooling pressure on the transformer cavity. When the ambient temperature is high, the dual-heat dissipation mode box-type substation assembly of this embodiment operates in the second mode. At this time, the transformer box 21 is switched to the isolation mode, which isolates the transformer cavity from the high-voltage cavity and the low-voltage cavity. The hot air in the transformer cavity enters the upper hot cavity, while the cold air in the lower cold cavity is retained only in the transformer cavity to cool the transformer 6 and prevent the cold air from flowing to other places, thus reducing the cooling effect of the cold air on the transformer 6.

[0070] A further improvement is that an airbag 262 is fixed to the circumferential inner wall of the wire hole 261. The airbag 262 is connected to a bidirectional air pump 263. The bidirectional air pump 263 drives the airbag 262 to switch back and forth between an inflated state and a contracted state. In the inflated state, the circumferential inner wall of the airbag 262 is sealed to the circumferential outer edge of the cable. In the contracted state, the circumferential inner wall of the airbag 262 and the cable form an annular ventilation gap.

[0071] With this design, by increasing the diameter of the wire hole 261, it is easier for cables to pass through, connecting the transformer 6 to the high-voltage cabinet and the low-voltage cabinet. At the same time, it is easier to install the air bag 262. The bidirectional air pump 263 operates to control the expansion or contraction of the air bag 262 to control the connection or isolation of two adjacent cavities, thereby controlling the switching of the transformer box 21 between interconnection mode and isolation mode.

[0072] Specifically, the bidirectional air pump 263 is fixed on the side of the partition 26 away from the transformer chamber. The two ends of the bidirectional air pump 263 are respectively connected to the chamber located at the end position (i.e., the high pressure chamber or the low pressure chamber) and the airbag 262. The airbag 262 is preferably made of flame-retardant silicone to ensure the safe and stable operation of the airbag 262.

[0073] Compared to existing technologies, by increasing the size of the wire hole 261 in the original partition 26, no new ventilation openings are needed. The structure is simple, requires minimal modification, and is easy to implement. Furthermore, after the airbag 262 is inflated, its own elasticity allows the cable to cooperate with the airbag 262, achieving efficient isolation between adjacent cavities. This prevents cold air entering the transformer cavity from entering the high-voltage or low-voltage cavity, thus affecting the cooling effect on the transformer 6 and ensuring cooling efficiency. When the outside temperature is relatively low, after the airbag 262 is deflated, the three cavities are interconnected, allowing the heat in the transformer cavity to diffuse to the high-voltage and low-voltage cavities and be discharged together, further improving the cooling effect on the transformer cavity.

[0074] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A prefabricated substation assembly with dual heat dissipation modes, comprising: The base is horizontally fixed to the ground; The enclosure assembly includes a transformer box fixed to the base. The transformer box includes a body, a door rotating on the body, and a lock that locks the door to the body. The body has three cavities arranged in sequence: a high-voltage cavity for installing a high-voltage switchgear, a transformer cavity for installing a transformer, and a low-voltage cavity for installing a low-voltage switchgear. Each cavity is connected to the door. The locked door seals and covers the opening of the corresponding cavity. The body has a heat exhaust port, and the door has a cold inlet. The heat exhaust port and the cold inlet communicate with the lower part and the top of the corresponding cavity, respectively. Its characteristic is that it further includes: The ventilation assembly includes a ventilation shell pre-embedded underground and vertically arranged, and a heat-insulating piston sealed to the circumferential inner wall of the ventilation shell. The heat-insulating piston and the ventilation shell enclose an upper hot chamber and a lower cold chamber located below the upper cold chamber. The upper hot chamber and the lower cold chamber are respectively connected to a hot air pipe and a cold air pipe. The hot air pipe and the cold air pipe are respectively provided with a hot air valve and a cold air valve and are both connected to the pressure transformer chamber. The lower cold chamber is also fixedly connected to a cold inlet pipe. The cold inlet pipe is provided with a cold inlet valve and the end away from the lower cold chamber is located above the ground. The telescopic assembly drives the heat-insulating piston to move vertically within the ventilation housing; An opening and closing assembly is used to control the opening and closing of the heat exhaust port and the cold inlet port that are connected to the transformer cavity; Temperature sensors are installed both inside the transformer cavity and outside the transformer box.

2. The prefabricated substation assembly with dual heat dissipation modes according to claim 1, characterized in that: A heat-conducting pipe is installed inside the transformer chamber. The bottom of the heat-conducting pipe is connected to the top of the hot gas pipe. The top of the heat-conducting pipe is spaced from the inner top wall of the transformer chamber. The cold gas pipe is fixedly connected to the bottom of the transformer chamber.

3. The prefabricated substation assembly with dual heat dissipation modes according to claim 2, characterized in that: The top of the heat-conducting shell is connected to a horizontal heat-conducting shell, and the outer circumferential edge of the heat-conducting shell is densely covered with hot air passages.

4. The prefabricated substation assembly with dual heat dissipation modes according to claim 1, characterized in that: The transformer has a flow divider installed on its inner bottom wall, which faces downward and is directly opposite the top of the cooling pipe. The top of the flow divider is densely covered with flow divider holes and its bottom is directly connected to the top of the cooling pipe. The flow divider is located directly below the transformer and there is a flow divider gap between it and the bottom of the transformer.

5. The prefabricated substation assembly with dual heat dissipation modes according to claim 1, characterized in that: The distance between the top of the ventilation shell and the ground is greater than or equal to 2m, and the height of the ventilation shell is 6-8m.

6. The prefabricated substation assembly with dual heat dissipation modes according to claim 4, characterized in that: The telescopic assembly includes two-stage electric push rods, which are arranged downwards and pass through the bottom of the housing and the base from top to bottom. The output end is sealed through the top of the ventilation shell and connected to the heat insulation piston. The top of the two-stage electric push rods is arranged adjacent to the inner top wall of the transformer chamber.

7. The prefabricated substation assembly with dual heat dissipation modes according to claim 1, characterized in that: The transformer box also includes a cover installed on the top of the box body. The cover and the box body enclose three heat dissipation cavities that correspond one-to-one with the three cavities directly above the box body. The bottom surface of the cover is provided with a heat dissipation vent located above the transformer box and separated from the transformer box. The heat dissipation vent is connected to the heat exhaust vent through the corresponding heat dissipation cavity. The top of the cooling pipe is connected to a hollow cooling shell, and the bottom surface of the cooling shell is provided with a cooling extraction vent.

8. The prefabricated substation assembly with dual heat dissipation modes according to claim 7, characterized in that: The opening and closing assembly includes a cold inlet opening and closing unit for controlling the opening and closing of the cold inlet and a heat exhaust opening and closing unit for controlling the opening and closing of the heat exhaust outlet.

9. The prefabricated substation assembly with dual heat dissipation mode according to any one of claims 1-8, characterized in that: The transformer box has an interconnected mode and a separated mode. In the interconnected mode, the three cavities are connected to each other, while in the separated mode, the three cavities are separated from each other.

10. The prefabricated substation assembly with dual heat dissipation modes according to claim 9, characterized in that: The transformer box includes two partitions fixed inside the box. Each partition has a cable pass-through hole. An air bladder is fixed to the inner circumferential wall of the cable pass-through hole. The air bladder is connected to a bidirectional air pump. The bidirectional air pump drives the air bladder to switch back and forth between an inflated state and a contracted state. In the inflated state, the inner circumferential wall of the air bladder is sealed to the outer circumferential edge of the cable. In the contracted state, the inner circumferential wall of the air bladder and the cable form an annular ventilation gap.

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