Prefabricated box-type substation

Abstract

The invention relates to the technical field of box-type substations, in particular to a prefabricated box-type substation which comprises a base and a box body arranged on the base, the interior of the box body is divided into a plurality of independent containing chambers by partition plates, and the containing chambers are a low-voltage chamber, a transformer chamber and a high-voltage chamber respectively; a cooling plate is arranged in the transformer chamber, and the interior of the cooling plate is divided into a plurality of cooling chambers I and a plurality of cooling chambers II; a plurality of groups of air inlets are formed in the cooling plate; the air inlets are positioned between the cooling chambers I and the cooling chambers II or between two adjacent cooling chambers II; flow guide assemblies are arranged in the cooling chamber I and the cooling chamber II, two groups of flow guide assemblies are arranged in the cooling chamber II, and each flow guide assembly sequentially comprises an accelerator plate, a flow stabilizing plate and a spoiler from top to bottom; the preassembled box-type transformer substation has the beneficial effects that the preassembled box-type transformer substation is efficiently cooled through air flow and water path collaborative cooling and integrated design, the operation and maintenance cost is reduced, and stable operation of equipment is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of box-type substations, in particular to a prepackaged box-type substation. BACKGROUND

[0002] As an integrated power supply device integrating transformers and power distribution devices, box-type substations are widely used in urban network construction, industrial parks and residential communities due to their compact structure and convenient installation. During operation, the internal core components such as transformers will continuously generate heat. If the heat cannot be dissipated in time, it will lead to a decrease in equipment operating efficiency, damage to insulation performance, and even cause a fault shutdown. Therefore, the heat dissipation performance is a key indicator for the design of box-type substations, and a reasonable heat dissipation structure design is needed to ensure stable operation of the equipment in a suitable temperature environment.

[0003] Currently, the heat dissipation method of box-type substations for dry-type transformers mainly relies on natural ventilation through louvers on the box or forced exhaust with a single fan. This conventional heat dissipation structure only achieves heat exchange through simple air convection, lacks directional guidance and efficient utilization of air flow, and causes local accumulation of hot air around the dry-type transformer, resulting in low heat dissipation efficiency. However, in the summer high-temperature environment, the external air introduced by the conventional fan has a high temperature itself, and the heat exchange capacity is limited, making it difficult to quickly reduce the temperature inside the box. At the same time, the traditional heat dissipation structure lacks directional guidance and enhanced heat exchange design for high-temperature air, and cannot effectively break through the heat dissipation bottleneck caused by high-temperature air in summer, resulting in that the heat dissipation effect of the transformer under the dual action of high load and high temperature cannot meet the stable operation demand. SUMMARY

[0004] The present application aims to provide a prepackaged box-type substation to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a prepackaged box-type substation comprising a base and a box arranged on the base, wherein the box is divided into multiple independent containing chambers by a partition plate, and the containing chambers are respectively a low-voltage chamber, a transformer chamber, and a high-voltage chamber; a cooling plate is arranged in the transformer chamber, and the cooling plate is divided into multiple cooling chambers one and cooling chambers two; multiple groups of air inlets are formed in the cooling plate, and the air inlets are located between the cooling chambers one and the cooling chambers two or between two adjacent cooling chambers two; a flow guide assembly is arranged in each of the cooling chambers one and the cooling chambers two, and two groups of flow guide assemblies are arranged in the cooling chambers two; and the flow guide assemblies are sequentially arranged from top to bottom as an acceleration plate, a flow stabilizing plate, and a turbulence plate.

[0006] Further, the cooling chambers one are located at both ends of the cooling plate, the cooling chambers two are located at the middle section of the cooling plate, the cooling plate faces the transformer equipment in the transformer chamber, the bottom of the cooling plate is provided with a mounting portion, and the mounting portion is provided with a bolt.

[0007] Further, the box is respectively provided with a side box door, a front box door and an inner box door, the inner box door is located in the front box door, and the inner box door is installed on the transformer chamber.

[0008] Further, the transformer chamber is provided with an exhaust fan, and the box is provided with an air outlet portion for cooperating with the exhaust fan.

[0009] Further, the air inlet is composed of an acceleration section one and a release section one, and the length ratio of the acceleration section one to the release section one is 6:1.

[0010] Further, the air inlet is composed of an acceleration section two, a steady flow section and a release section two, and the length ratio of the acceleration section two to the steady flow section to the release section two is 5:1:1.

[0011] Further, the air inlet is provided with a condensation plate, and the condensation plate is provided with a collection groove with an opening facing outside the box door.

[0012] Further, the cooling plate is provided with a flow collecting opening corresponding to the collection groove, the cooling plate is provided with a drain opening, and the flow collecting opening and the drain opening are connected through a pipeline arranged in the cooling plate.

[0013] Further, the cooling plate is provided with a plurality of water outlets and water inlets, and the water inlets and water outlets are used for water inlet and outlet of the cooling chamber one and the cooling chamber two.

[0014] Further, the cooling chamber two is provided with a flow dividing plate, the acceleration plate is an arc plate for downward flow guiding, the steady flow plate is a straight inclined plate for downward flow guiding, and the front section of the flow disturbing plate is a straight inclined plate for downward flow guiding, and the rear section of the flow disturbing plate is a circular arc plate for upward flow guiding.

[0015] Compared with the prior art, the beneficial effects of the present application are: 1. Through the cooperation of the exhaust fan, the cooling plate, the flow guiding assembly and the air inlet, a high-efficiency airflow and waterway double cooling system is constructed, the heat dissipation performance is significantly improved, and the stable operation of the equipment in high temperature environment is guaranteed: the exhaust fan provides negative pressure power, drives the external air to enter the transformer chamber after filtration and flows to the air inlet of the cooling plate; the cooling water in the cooling chamber one and the cooling chamber two in the cooling plate is accelerated by the acceleration plate, uniformly flows by the steady flow plate and forms turbulence by the flow disturbing plate, so that the heat absorption efficiency is maximized, the airflow of the air inlet is cooled, the cooled airflow is directed to the transformer through the acceleration section and the steady flow section, and then the hot air is discharged through the air outlet portion by the exhaust fan. The cooperative system breaks through the limitation of traditional single ventilation and heat dissipation, can quickly reduce the temperature in the box even in summer high temperature environment, avoids that the insulation performance of the transformer is damaged, the operation efficiency is reduced or the equipment is stopped due to overheating, and greatly improves the operation stability and service life of the equipment.

[0016] 2. Through the condensing plate, filter assembly, modular structure and detachable cooling plate design, multi-dimensional risk prevention and control and convenient operation and maintenance are realized, and the equipment failure rate and the whole life cycle cost are reduced: the condensing plate in the air inlet can condense the water vapor in the air flow, which is discharged through the collection groove, flow collecting port and drainage port, so as to avoid that the equipment is damp due to water vapor; the filter assembly of the front box door intercepts dust and impurities in the air, reducing the pollution of the equipment; the cooling plate is detachably installed through the bolts of the bottom mounting part, and the layered design of the side box door, the front box door and the inner box door makes each containing chamber independent and isolated. These designs not only reduce the equipment failure risk caused by water vapor and impurities, but also facilitate targeted maintenance and replacement of parts by operation and maintenance personnel, reducing operation and maintenance time and difficulty; at the same time, the waterway system adopts the "upper inlet and lower outlet" gravity driven design, without additional power equipment, saving energy consumption and purchase cost, and reducing the use and maintenance cost of the whole life cycle of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application Figure 1 ; Figure 2 is a schematic diagram of the overall structure of the present application Figure 2 ; Figure 3 is a schematic diagram of the overall structure of the present application Figure 3 ; Figure 4 is a schematic diagram of the structure of the cooling plate of the present application Figure 5 is a schematic diagram of the structure of the cooling plate of the present application Figure 4 ; Figure 6 is a sectional view of the cooling plate of the present application Figure 1 ; Figure 7 is a sectional view of the cooling plate of the present application Figure 2 ; Figure 8 is a schematic diagram of the structure of the cooling plate of the present application Figure 7 ; Figure 9 is a schematic diagram of the structure of the cooling plate of the present application

[0018] The components represented by each number in the attached diagram are listed below: 1. Base; 2. Housing; 3. Side door; 4. Low-pressure chamber; 5. Front door; 6. Inner door; 7. Air outlet; 8. Transformer chamber; 9. Exhaust fan; 10. Cooling plate; 11. Mounting part; 12. Bolt; 13. Air inlet; 1301. Acceleration section one; 1302. Discharge section one; 1303. Acceleration section two; 1304. Flow stabilization section; 1305. Discharge section two; 14. Condensation plate; 15. Water outlet; 16. Water inlet; 17. Collector; 18. Collection tank; 19. Cooling chamber one; 20. Cooling chamber two; 21. Flow divider; 22. Flow guide assembly; 2201. Acceleration plate; 2202. Flow stabilization plate; 2203. Baffle plate; 23. Drain outlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a technical solution: such as Figures 1-9 The prefabricated box-type substation shown includes a base 1 and a box 2 mounted on the base 1. The box 2 is divided into multiple independent storage chambers by partitions, namely a low-voltage chamber 4, a transformer chamber 8, and a high-voltage chamber. The transformer chamber 8 is equipped with a cooling plate 10, which is divided into multiple cooling chamber 19 and cooling chamber 20. Multiple sets of air inlets 13 are opened on the cooling plate 10, which are located between cooling chamber 19 and cooling chamber 20 or between two adjacent cooling chambers 20. Both cooling chamber 19 and cooling chamber 20 are equipped with flow guiding components 22. Cooling chamber 20 is equipped with two sets of flow guiding components 22, which are arranged from top to bottom as an acceleration plate 2201, a flow stabilizing plate 2202, and a flow turbulence plate 2203.

[0021] Cooling chamber one 19 is located at both ends of cooling plate 10, cooling chamber two 20 is located at the middle section of cooling plate 10, the bottom of cooling plate 10 is provided with mounting portion 11, mounting portion 11 is provided with bolt 12, box body 2 is respectively provided with side box door 3, front box door 5, inner box door 6, inner box door 6 is located in front box door 5, inner box door 6 is installed on transformer chamber 8, exhaust fan 9 is arranged in transformer chamber 8, air outlet portion 7 is arranged on box body 2 and is matched with exhaust fan 9, air inlet 13 is composed of accelerating section one 1301 and discharging section one 1302, wherein the length ratio of accelerating section one 1301 and discharging section one 1302 is 6:1, air inlet 13 is composed of accelerating section two 1303, flow stabilizing section 1304 and discharging section two 1305, wherein the length ratio of accelerating section two 1303, flow stabilizing section 1304 and discharging section two 1305 is 5:1:1, condensing plate 14 is arranged in air inlet 13, collecting groove 18 with opening facing the outside of the door is arranged on condensing plate 14, collecting groove 18 corresponds to collecting groove 18, collecting groove 18 and discharging section two 1305 are connected through the pipeline arranged in cooling plate 10, a plurality of water outlets 15 and water inlets 16 are arranged on cooling plate 10, water inlets 16 and water outlets 15 are respectively used for water inlet and outlet of cooling chamber one 19 and cooling chamber two 20, and shunt plate 21 is arranged in cooling chamber two 20, accelerating plate 2201 is an arc plate for downward flow, flow stabilizing plate 2202 is a straight inclined plate for downward flow, and the front section of flow disturbing plate 2203 is a straight inclined plate for downward flow, and the rear section is a circular arc plate for upward flow.

[0022] In the application, the application aims at the technical difficulties of traditional prefabricated box-type substation, such as dependence on natural ventilation or single fan heat dissipation, low heat dissipation efficiency in high-temperature environment, and easy influence of water vapor and dust, and through the multi-system collaborative design of "air flow circulation-water cooling-structure protection", an integrated and efficient cooling and operation guarantee system is constructed.

[0023] In the overall structural layout, the base 1 serves as a bearing foundation, and the box body 2 on the base 1 is divided into a low-voltage chamber 4, a transformer chamber 8 and a high-voltage chamber by a partition plate, which can effectively avoid electromagnetic interference and fault diffusion between devices of different voltage levels, and at the same time, the heat dissipation core is concentrated in the transformer chamber 8 to realize targeted heat dissipation optimization. The transformer chamber 8 is the core functional area, and the cooling plate 10 opposite to the transformer device is arranged, the cooling plate 10 is stably installed through the bolt 12 of the bottom mounting portion 11, and the cooling plate 10 is convenient for disassembly and maintenance in the later period; the inside is divided into cooling chamber one 19 at both ends and cooling chamber two 20 at the middle section, the cooling chamber two 20 is provided with a shunt plate 21 and two groups of flow guide components 22 due to the need to bear the main cooling load, and the cooling chamber one 19 is provided with a group of flow guide components 22, forming a "primary and secondary collaborative" water cooling pattern.

[0024] The flow guide assembly 22 adopts a stepped structure design of "acceleration-steady flow-turbulence": from top to bottom, it is an acceleration plate 2201, a steady flow plate 2202 and a turbulence plate 2203. Among them, the acceleration plate 2201 is a downward flow arc plate that can quickly increase the water flow speed; the steady flow plate 2202 is a downward flow straight inclined plate that can maintain the water flow direction while gently increasing the flow speed; the turbulence plate 2203 adopts a composite structure of "straight inclined front section and circular arc rear section", which can form turbulence at the end of the water flow to strengthen the heat exchange efficiency. The multiple groups of air inlets 13 on the cooling plate 10 are located between the cooling chamber one 19 and the cooling chamber two 20 or between adjacent cooling chamber two 20, ensuring that the airflow can directly contact the cooled plate body area; the air inlet 13 is designed in two structures that can adapt to different scenes: one is composed of an acceleration section one 1301 and a release section one 1302, and the length ratio of the two is 6:1, focusing on high-speed airflow output; the other is composed of an acceleration section two 1303, a steady flow section 1304 and a release section two 1305, and the length ratio is 5:1:1, taking into account the acceleration and quiet effect.

[0025] To solve the risk of equipment dampening caused by water vapor in the airflow, a condensation plate 14 is arranged in the air inlet 13, and the collection groove 18 on the condensation plate 14 is open to the outside of the box door, which can collect condensed water droplets in a directional manner; the flow collection port 17 on the cooling plate 10 corresponds to the collection groove 18, which is communicated with the drain outlet 23 through the internal pipeline, forming a water vapor treatment closed loop of "condensation-collection-flow guide-discharge". The waterway system adopts a gravity-driven design of "up-in and down-out", and the water inlet 16 above the cooling plate 10 and the water outlet 15 below form a water supply and drainage for the cooling chamber one 19 and the cooling chamber two 20, respectively, realizing water circulation without power by means of height difference. In addition, the exhaust fan 9 in the transformer chamber 8 cooperates with the air outlet 7 on the box body 2 to provide negative pressure power for airflow circulation; the side box door 3, the front box door 5 (equipped with a simple filter assembly) and the inner box door 6 (corresponding to the transformer chamber 8) on the box body 2 form a layered protection structure, which not only filters impurities in the air inlet, but also realizes independent operation and maintenance of each area.

[0026] The whole device takes the transformer chamber 8 as the core, and the waterway cooling and the airflow cooling are connected in series through the cooling plate 10, the waterway heat exchange efficiency is optimized through the flow guide assembly 22, the airflow output effect is optimized through the structure of the air inlet 13, the airflow circulation is driven through the exhaust fan 9, and the environmental risk is prevented and controlled through the water vapor treatment system. Each component does not work independently, but forms a linkage system of "power traction-medium cooling-airflow delivery-risk prevention and control", thereby improving the heat dissipation performance and operation reliability of the transformer substation.

[0027] Reference Figures 1-9 The working principle of the present application: the operation process of the present application takes "airflow circulation as carrier, waterway cooling as core and multi-system linkage as guarantee", realizes efficient heat dissipation and stable operation of the transformer through the cooperative action of each component, and the specific process is as follows: I. Airflow circulation start and pretreatment: When the exhaust fan 9 in the transformer room 8 is started, the negative pressure generated by it will break the air pressure balance inside and outside the box 2, driving external air to enter the box along a specific path. The external air first contacts the positive box door 5 of the box 2, and the simple filter assembly on the positive box door 5 will intercept dust, debris and other solid impurities in the air to prevent them from entering the transformer room 8 and adhering to the device surface to affect heat dissipation or cause circuit short circuit; the filtered air passes through the positive box door 5 and then enters the transformer room 8 through the inner box door 6 corresponding to the transformer room 8. At this time, under the continuous negative pressure of the exhaust fan 9, the air entering the room will directly hit the cooling plate 10 opposite the transformer device, and most of the airflow will be blocked and guided by the cooling plate 10 to flow to the multiple air inlets 13 on the cooling plate 10. A small part of the airflow forms an auxiliary convection in the transformer room 8, and finally all the airflow is sucked into the exhaust fan 9 and discharged to the outside through the air outlet 7 on the box 2, thereby forming a complete "suction-cooling-discharge" airflow circulation.

[0028] II. Water vapor treatment and airflow guidance in air inlet 13: The airflow entering the air inlet 13 first contacts the condensing plate 14 in the air inlet 13. Since the condensing plate 14 is maintained at a low temperature by the cooling water inside the cooling plate 10, the water vapor in the airflow will condense into small droplets under the action of temperature difference. These water droplets will fall into the collection groove 18 on the condensing plate 14 under the action of gravity. Since the opening of the collection groove 18 is directed outward from the box door, it can prevent the water droplets from flowing back into the transformer room 8. When the condensate in the collection groove 18 accumulates to a certain amount, it will be collected through the corresponding collection port 17 and introduced into the pre-designed pipeline inside the cooling plate 10. The pipeline guides the condensate to the drain port 23 on the cooling plate 10, and finally discharges it outside the box 2, completely solving the problem of equipment moisture caused by condensate accumulation in traditional heat dissipation structures.

[0029] The dry airflow after water vapor treatment will continue to flow along the structure of the air inlet 13, and will present different flow states according to the two different designs of the air inlet 13: (1) The first air inlet 13 structure (acceleration section one 1301 + release section one 1302): the airflow first enters the acceleration section one 1301 with a higher length ratio. Since the channel design of the acceleration section one 1301 has a contraction feature, the airflow will achieve a rapid increase in wind speed during the flow process due to space compression; then the airflow enters the release section one 1302, which has a relatively stable channel structure and can stabilize the high-speed airflow, so that the airflow is blown out of the air inlet 13 in a directional and high-speed state, directly acting on the heating area of the transformer main body, and removing the heat on the device surface through the flow of high-speed airflow.

[0030] (2) The second air inlet 13 structure (acceleration section two 1303 + stable flow section 1304 + release section two 1305): the airflow first enters the acceleration section two 1303, and converges and accelerates under the guidance of the channel; then enters the stable flow section 1304, the internal structure of which is optimized to effectively reduce airflow disturbance and noise generated during airflow flow; finally, the airflow is stably released to the surface of the transformer through the release section two 1305. This structure can significantly reduce equipment operating noise while ensuring heat dissipation efficiency, and is suitable for noise-sensitive residential areas, commercial areas and other scenarios.

[0031] III. Synergistic effect of water circulation and airflow cooling: While the airflow circulates, the waterway system is simultaneously started to enhance the cooling effect. The cooling water enters cooling chamber one 19 and cooling chamber two 20 through the water inlet 16 above the cooling plate 10. Since the water inlet 16 is located at the upper part of the cooling plate 10 and the water outlet 15 is located at the lower part, the height difference between them causes the cooling water to flow naturally under the action of gravity, without the need for additional power equipment such as water pumps, thereby saving energy consumption and reducing the risk of failure.

[0032] The cooling water entering the cooling chamber two 20 first contacts the flow divider 21, which can evenly distribute the concentrated cooling water to the two groups of flow guide assemblies 22, avoiding uneven cooling of the cooling chamber two 20 due to concentrated water flow. The divided cooling water directly flows to the acceleration plate 2201 of the flow guide assembly 22, and the downward flow arc plate structure of the acceleration plate 2201 can quickly increase the water flow speed, so that the low-temperature cooling water quickly covers the corresponding area of the cooling plate 10 and preliminarily absorbs the heat conducted by the air inlet 13; then the water flow enters the stable flow plate 2202, and the downward flow straight and inclined plate structure of the stable flow plate 2202 makes the water flow flow at a slower speed than the acceleration plate 2201, while maintaining the stability of the water flow direction and further absorbing heat, at this time the water flow temperature rises slightly; finally, the water flow reaches the turbulence plate 2203, and the front straight and inclined plate of the turbulence plate 2203 guides the water flow to continue downward, while the rear upward flow circular arc plate makes the water flow direction change abruptly, forming a state of intense turbulence. This design plays a key role in high-temperature environments in summer: the external air itself is relatively high in temperature in summer, and the heat dissipation effect of airflow circulation is limited, while the cooling water in the cooling chamber two 20 is in a low-temperature state at the acceleration plate 2201 section, the temperature rises after the stable flow plate 2202 section, and reaches the highest temperature at the turbulence plate 2203 section. The turbulent state can significantly increase the contact area and contact time of the cooling water and the inner wall of the cooling plate 10, significantly improve the heat absorption efficiency of the cooling water, and enable the cooling plate 10 to continuously cool the airflow in the air inlet 13, ensuring that the airflow blown out from the air inlet 13 always maintains a low temperature, and cooperating with the airflow circulation driven by the exhaust fan 9, forming a secondary cooling effect of "waterway-cooled airflow - air-cooled equipment".

[0033] The cooling water in the cooling chamber 19 only flows through a set of guide components 22, but also follows the flow process of "acceleration-steady flow-turbulence". Through the sequential action of the acceleration plate 2201, the steady flow plate 2202 and the turbulence plate 2203, the air flow in the two end regions of the cooling plate 10 is assisted, the overall temperature of the cooling plate 10 is ensured to be uniform, and the cooling effect of the air inlet 13 is avoided due to the local temperature being too high. The cooling water after completing heat exchange is discharged through the water outlet 15 below the cooling plate 10, forming a closed loop of water circulation.

[0034] IV. Closed loop protection of multi-system combined operation: During the entire operation process, each system presents the characteristics of deep linkage: the negative pressure power of the exhaust fan 9 is the basis for air circulation, and the suction size directly determines the speed of the air flow through the air inlet 13; the waterway system in the cooling plate 10 maximizes the heat absorption efficiency of the cooling water through the structural optimization of the guide component 22, and directly determines the cooling amplitude of the air flow in the air inlet 13; the structural design of the air inlet 13 converts the cooled air flow into high-speed or low-noise state according to the scene demand, ensuring that the air flow can efficiently act on the transformer; the water vapor treatment system eliminates the harm of water vapor in the air flow to the equipment through the cooperation of the condensation plate 14, the collection groove 18, the flow collecting port 17 and the drain port 23; the filter component of the front door 5 provides clean protection for air circulation. These systems support and influence each other, forming a complete operation closed loop of "power traction-air flow filtration-water vapor treatment-joint cooling-waste gas exhaust", ensuring that the transformer can still maintain a stable operating temperature in complex environments such as high temperature and high humidity.

[0035] It should be noted that, in the present text, relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article, or device.

[0036] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated box-type substation, comprising a base (1) and a box (2) arranged on the base (1), characterized in that: the box (2) is divided into multiple independent containing chambers by a partition plate, and the containing chambers are respectively a low-voltage chamber (4), a transformer chamber (8), and a high-voltage chamber; the transformer chamber (8) is provided with a cooling plate (10), and the cooling plate (10) is divided into multiple cooling chamber one (19) and cooling chamber two (20); a plurality of air inlets (13) are formed on the cooling plate (10), and the air inlets (13) are located between the cooling chamber one (19) and the cooling chamber two (20) or between two adjacent cooling chamber two (20); the cooling chamber one (19) and the cooling chamber two (20) are both provided with a flow guide assembly (22), and two groups of flow guide assemblies (22) are arranged in the cooling chamber two (20), and the flow guide assemblies (22) are sequentially arranged from top to bottom as an acceleration plate (2201), a flow stabilizing plate (2202), and a spoiler (2203).

2. A prepackaged box-type substation according to claim 1, characterized in that: The cooling chamber one (19) is located at both ends of the cooling plate (10), the cooling chamber two (20) is located at the middle section of the cooling plate (10), the cooling plate (10) faces the transformer equipment in the transformer chamber (8), and the bottom of the cooling plate (10) is provided with a mounting portion (11), and the mounting portion (11) is provided with a bolt (12).

3. A prepackaged box-type substation according to claim 1, characterized in that: The box (2) is respectively provided with a side box door (3), a front box door (5), and an inner box door (6), the inner box door (6) is located in the front box door (5), and the inner box door (6) is arranged on the transformer chamber (8).

4. A prepackaged box-type substation according to claim 1, characterized in that: An exhaust fan (9) is arranged in the transformer chamber (8), and an air outlet portion (7) is arranged on the box (2) and matched with the exhaust fan (9).

5. A prepackaged box-type substation according to claim 1, characterized in that: The air inlet (13) is composed of an acceleration section one (1301) and a release section one (1302), wherein the length ratio of the acceleration section one (1301) and the release section one (1302) is 6:

1.

6. A prepackaged box-type substation according to claim 5, characterized in that: The air inlet (13) is composed of an acceleration section two (1303), a flow stabilizing section (1304), and a release section two (1305), wherein the length ratio of the acceleration section two (1303), the flow stabilizing section (1304), and the release section two (1305) is 5:1:

1.

7. A prepackaged box-type substation according to claim 1, characterized in that: A condensation plate (14) is arranged in the air inlet (13), and the condensation plate (14) is provided with a collection groove (18) with an opening facing outward of the box door.

8. A prepackaged box-type substation according to claim 7, characterized in that: A flow collecting port (17) is arranged on the cooling plate (10) and corresponds to the collection groove (18), and a drain port (23) is formed on the cooling plate (10), and the flow collecting port (17) and the drain port (23) are connected in communication through a pipeline arranged in the cooling plate (10).

9. A prepackaged box-type substation according to claim 1, characterized in that: A plurality of water outlets (15) and water inlets (16) are arranged on the cooling plate (10), and the water inlets (16) and the water outlets (15) are respectively used for water inlet and outlet of the cooling chamber one (19) and the cooling chamber two (20).

10. A prepackaged box-type substation according to claim 1, characterized in that: The cooling chamber two (20) is internally provided with a flow dividing plate (21), the accelerating plate (2201) is an arc plate guiding downward, the flow stabilizing plate (2202) is a straight inclined plate guiding downward, and the front section of the spoiler (2203) is a straight inclined plate guiding downward, and the rear section thereof is a circular arc plate guiding upward.

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