Frequency conversion room

Abstract

A frequency conversion room comprises a box body, a frequency converter cabinet, a transformer cabinet and a pre-charging switch cabinet, the frequency converter cabinet, the transformer cabinet and the pre-charging switch cabinet are sequentially arranged in the box body from left to right, the frequency converter cabinet and the transformer cabinet are electrically connected through a busbar, and the transformer cabinet and the pre-charging switch cabinet are electrically connected through a busbar. According to the frequency conversion room, the frequency converter cabinet, the transformer cabinet and the pre-charging switch cabinet are sequentially arranged in the box body from left to right, the layout in the box body is reasonable, busbar connection among the cabinet bodies is facilitated, the busbar length is saved, and the cost is saved. According to the frequency conversion room, the frequency converter cabinet, the transformer cabinet and the pre-charging switch cabinet are integrated in the box body, and compared with the prior art that the transformer cabinet and the pre-charging switch cabinet are arranged outside the box body, the structure is more compact, the overall size is small, overall hoisting is facilitated, and the overall protection grade is high.

Description

Technical Field

[0001] The utility model relates to the technical field of power control equipment, in particular to a frequency conversion room. Background Art

[0002] A frequency conversion room usually includes a container and an inverter disposed inside the container. Currently, with the rapid development of exploration and development in domestic and foreign fields such as oil and natural gas, the depth and mining difficulty of oil fields and gas wells are increasing continuously, and the construction methods and requirements of fracturing operations are becoming more diverse and flexible. Fracturing operations usually use a fracturing pump, and the fracturing pump is mostly driven by an inverter in the frequency conversion room.

[0003] However, generally only an inverter is provided in the existing frequency conversion room. When in use, a transformer cabinet and the like need to be additionally equipped, and the inverter and the transformer cabinet are connected by external cables. Therefore, the overall layout is not compact enough, the overall volume is large, and integral hoisting cannot be achieved; moreover, multiple cabinets are independently and separately arranged, external wiring is required, and the overall protection level is low, which cannot meet the use requirements of existing exploration and development in fields such as oil and natural gas. Summary of the Utility Model

[0004] The purpose of the utility model is to avoid the deficiencies in the prior art and provide a frequency conversion room with a small volume, a compact structure and a high protection level, aiming to solve the above technical problems.

[0005] A frequency conversion room includes: a box body, an inverter cabinet, a transformer cabinet and a precharge switch cabinet. The inverter cabinet, the transformer cabinet and the precharge switch cabinet are sequentially arranged in the box body from left to right, and are electrically connected by busbars between the inverter cabinet and the transformer cabinet, and between the transformer cabinet and the precharge switch cabinet.

[0006] Preferably, water cooling pipes are laid at the upper ends of the transformer cabinet, the water cooling cabinet and the precharge switch cabinet in the box body. The number of heat dissipation pipes of the water cooling cabinet is two, namely a first heat dissipation pipe and a second heat dissipation pipe. The water outlet end of the heat dissipation circulation pipeline is connected to the water inlet end of the first heat dissipation pipe, the water outlet end of the first heat dissipation pipe is connected to the water inlet end of the water cooling pipe, the water outlet end of the water cooling pipe is connected to the water inlet end of the second heat dissipation pipe, the water outlet end of the second heat dissipation pipe is connected to the water inlet end of the heat dissipation circulation pipeline, a heat exchanger is arranged at the upper end of the water cooling pipe, the water cooling pipe is communicated with the heat dissipation pipe, and a heat dissipation fan is arranged at the upper end of the heat exchanger.

[0007] Preferably, water cooling pipes are laid at the upper ends of the transformer cabinet, the water cooling cabinet and the precharge switch cabinet in the box body. A heat exchanger is arranged at the upper end of the water cooling pipe, the water cooling pipe is communicated with the heat dissipation pipe, and a heat dissipation fan is arranged at the upper end of the heat exchanger.

[0008] Preferably, the above-mentioned box body is provided with a top plate and side plates. The corresponding positions of the transformer cabinet, the water-cooled cabinet, and the pre-charge switch cabinet on the top plate are provided with grille plates that are in communication with the outside air, and the corresponding upper positions of the transformer cabinet, the water-cooled cabinet, and the pre-charge switch cabinet on the side plates are provided with louvers.

[0009] Preferably, the above-mentioned transformer cabinet includes a first cabinet body and a transformer arranged in the first cabinet body. A pre-charge resistor assembly is arranged at the front end of the transformer in the first cabinet body, and a filter RC assembly is arranged at the rear end of the transformer in the first cabinet body.

[0010] Preferably, the above-mentioned heat dissipation circulation pipeline is arranged in a zigzag shape around the transformer in the first cabinet body, and a plurality of fan heat exchanger assemblies are arranged at the corresponding positions of the heat dissipation circulation pipeline on the side of the transformer.

[0011] Preferably, the above-mentioned frequency converter cabinet includes a second cabinet body, a rectification module, a first capacitor module, a first inverter module, a second capacitor module, a second inverter module, a control module, and a plurality of vertical partitions. The vertical partitions divide the interior of the second cabinet body into a first cavity, a second cavity, a third cavity, a fourth cavity, and a fifth cavity from right to left in sequence. The rectification module is arranged at the lower part of the first cavity, the first capacitor module is arranged at the upper part of the first cavity, the first inverter module is arranged in the second cavity, the second capacitor module is arranged in the third cavity, the second inverter module is arranged in the fourth cavity, and the control module is arranged in the fifth cavity.

[0012] Preferably, an air conditioner is arranged behind the frequency converter cabinet in the above-mentioned box body, and an air inlet grille and an air outlet grille are arranged at the position of the air conditioner on the side plate.

[0013] Preferably, a plurality of lighting lamps are arranged on the outer side surface of the above-mentioned box body, and a first uninterruptible power supply for supplying power to the lighting lamps and a second uninterruptible power supply for supplying power to external devices are arranged above the control module in the frequency converter cabinet.

[0014] Preferably, a maintenance ladder is arranged on the side surface of the above-mentioned box body, and partition walls are arranged on both sides of the transformer cabinet in the box body.

[0015] A frequency conversion room of the present utility model arranges an inverter cabinet, a transformer cabinet, and a pre-charge switch cabinet in sequence from left to right in a box body. Compared with the prior art, the frequency conversion room of the present utility model integrates the inverter cabinet, the transformer cabinet, and the pre-charge switch cabinet in the box body. The pre-charge switch cabinet is mainly used in the power system to charge the capacitor through a pre-charge circuit before starting the equipment, so as to reduce the current impact during startup and protect the safety of the equipment and the circuit. The external high-voltage input cable is connected to the pre-charge switch cabinet and then connected to the transformer cabinet through the pre-charge switch cabinet. The transformer cabinet converts the high voltage into low voltage and then transmits it to the inverter cabinet. The inverter cabinet adjusts the frequency and voltage as needed and then drives the motor to work.

[0016] The frequency conversion room of the present utility model arranges the inverter cabinet, the transformer cabinet, and the pre-charge switch cabinet in sequence from left to right in the box body. The layout in the box body is reasonable, which is beneficial to the busbar connection between the cabinets, saves the length of the busbar, and reduces costs. The frequency conversion room of the present utility model integrates the inverter cabinet, the transformer cabinet, and the pre-charge switch cabinet in the box body. Compared with the prior art where the transformer cabinet and the pre-charge switch cabinet are arranged outside the box body, the structure is more compact, the overall volume is small, which is beneficial to the overall hoisting, and the overall protection level is high. Description of the Drawings

[0017] The present utility model is further described with the aid of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the present utility model.

[0018] Figure 1 is a schematic structural diagram of a frequency conversion room of the present utility model;

[0019] Figure 2 is a schematic diagram of the internal structure of the box body of a frequency conversion room of the present utility model;

[0020] Figure 3 is a schematic diagram of the internal structure of the box body of a frequency conversion room of the present utility model;

[0021] Figure 4 is a schematic structural diagram of the transformer of a frequency conversion room of the present utility model. Detailed Embodiments

[0022] The present utility model is further described in conjunction with the following embodiments and the attached drawings:

[0023] A frequency conversion room, as Figures 1 to 3 shown, includes: a box body 10, an inverter cabinet 11, a transformer cabinet 12, and a pre-charge switch cabinet 13. The inverter cabinet 11, the transformer cabinet 12, and the pre-charge switch cabinet 13 are arranged in sequence from left to right in the box body 10. The inverter cabinet 11 and the transformer cabinet 12, and the transformer cabinet 12 and the pre-charge switch cabinet 13 are electrically connected through busbars (not marked in the figure).

[0024] A frequency conversion room of the present utility model arranges a frequency converter cabinet 11, a transformer cabinet 12, and a pre-charge switch cabinet 13 in sequence from left to right inside a box body 10. Compared with the prior art, the frequency conversion room of the present utility model integrates the frequency converter cabinet 11, the transformer cabinet 12, and the pre-charge switch cabinet 13 inside the box body 10. The pre-charge switch cabinet 13 is mainly used in the power system to charge the capacitor through a pre-charge circuit before starting the equipment, so as to reduce the current impact during startup and protect the safety of the equipment and the circuit. The external high-voltage input cable is connected to the pre-charge switch cabinet 13 and then connected to the transformer cabinet 12 through the pre-charge switch cabinet 13. The transformer cabinet 12 converts the high voltage into low voltage and then transmits it to the frequency converter cabinet 11. The frequency converter cabinet 11 drives the motor to work after adjusting the frequency and voltage as needed.

[0025] The frequency conversion room of the present utility model arranges the frequency converter cabinet 11, the transformer cabinet 12, and the pre-charge switch cabinet 13 in sequence from left to right inside the box body 10. The layout inside the box body 10 is reasonable, which is beneficial to the connection of the busbars (not marked in the figure) between the cabinets, saves the length of the busbars (not marked in the figure), and saves costs. The frequency conversion room of the present utility model integrates the frequency converter cabinet 11, the transformer cabinet 12, and the pre-charge switch cabinet 13 inside the box body 10. Compared with the prior art where the transformer cabinet 12 and the pre-charge switch cabinet 13 are arranged outside the box body 10, the structure is more compact, the overall volume is small, which is beneficial to the overall hoisting, and the overall protection level is high.

[0026] Preferably, as Figure 2 and Figure 3 shown, the frequency conversion room is also provided with a water-cooled cabinet 14 with heat dissipation pipes (not marked in the figure) inside. The water-cooled cabinet 14 is arranged behind the pre-charge switch cabinet 13 inside the box body 10. Heat dissipation circulation pipelines 15 are arranged in both the frequency converter cabinet 11 and the transformer cabinet 12. A water pump (not marked in the figure) is arranged inside the heat dissipation pipes (not marked in the figure). The heat dissipation circulation pipelines 15 are communicated with the heat dissipation pipes (not marked in the figure).

[0027] The heat dissipation pipes (not marked in the figure) of the water-cooled cabinet 14 are communicated with the heat dissipation circulation pipelines 15. The heat dissipation pipes (not marked in the figure) and the heat dissipation circulation pipelines 15 can be filled with a coolant such as water. A water pump (not marked in the figure) is arranged inside the heat dissipation pipes (not marked in the figure), which can accelerate the circulation of the coolant inside the heat dissipation pipes (not marked in the figure) and the heat dissipation circulation pipelines 15 and accelerate the heat dissipation of the heat dissipation circulation pipelines 15. The water-cooled cabinet 14 can dissipate heat from the components inside the frequency converter cabinet 11 and the transformer cabinet 12, and the heat dissipation effect is good. Arranging the water-cooled cabinet 14 behind the pre-charge switch cabinet 13 in the frequency conversion room can effectively utilize the space inside the frequency conversion room, with a reasonable layout, a more compact structure, without the need to additionally arrange a water-cooled cabinet 14 outside the frequency conversion room, and without the need to connect pipelines outside the box body 10 of the frequency conversion room, which is beneficial to the overall hoisting and the overall protection level is high.

[0028] Preferably, as Figure 2 and Figure 3As shown, water-cooling pipes 16 are laid at the upper ends of the transformer cabinet 12, the water-cooling cabinet 14 and the pre-charging switch cabinet 13 in the cabinet body 10. The number of heat dissipation pipes (not marked in the figure) of the water-cooling cabinet 14 is two, namely the first heat dissipation pipe (not marked in the figure) and the second heat dissipation pipe (not marked in the figure). The water outlet end of the heat dissipation circulation pipeline 15 is connected to the water inlet end of the first heat dissipation pipe (not marked in the figure). The water outlet end of the first heat dissipation pipe (not marked in the figure) is connected to the water inlet end of the water-cooling pipe 16. The water outlet end of the water-cooling pipe 16 is connected to the water inlet end of the second heat dissipation pipe (not marked in the figure). The water outlet end of the second heat dissipation pipe (not marked in the figure) is connected to the water inlet end of the heat dissipation circulation pipeline 15. A heat exchanger 17 is arranged at the upper end of the water-cooling pipe 16. The water-cooling pipe 16 is communicated with the heat dissipation pipe (not marked in the figure). A heat dissipation fan 18 is arranged at the upper end of the heat exchanger 17.

[0029] That is, the heat dissipation circulation pipeline 15, the first heat dissipation pipe (not marked in the figure), the second heat dissipation pipe (not marked in the figure), and the water-cooling pipe 16 are connected end to end in sequence to form a closed-loop circulation heat dissipation pipeline (not marked in the figure). After the coolant in the heat dissipation circulation pipeline 15 in the frequency converter cabinet 11 and the transformer cabinet 12 absorbs the heat of the components in each cabinet, it becomes hot coolant. The hot coolant flows into the first heat dissipation pipe (not marked in the figure) in the water-cooling cabinet 14, and after being pressurized by a water pump (not marked in the figure) in the heat dissipation pipe (not marked in the figure), it flows into the water-cooling pipe 16. Through external heat dissipation of the water-cooling pipe 16, the hot coolant in the water-cooling pipe 16 cools down and becomes cold coolant. The cold coolant then flows back to the heat dissipation circulation pipeline 15 through the second heat dissipation pipe (not marked in the figure). The cold coolant absorbs the heat of the components in each cabinet, and so on in a cycle, thereby realizing the heat dissipation of the frequency converter cabinet 11 and the transformer cabinet 12.

[0030] A heat exchanger 17 is arranged at the upper end of the water-cooling pipe 16. The heat exchanger 17 can be an aluminum heat exchanger 17 or a heat exchanger 17 of other existing technologies. The water-cooling pipe 16 can dissipate heat through the heat dissipation fins on the heat exchanger 17. A heat dissipation fan 18 is arranged at the upper end of the heat exchanger 17. The heat dissipation fan 18 can increase the air circulation and improve the heat dissipation efficiency of the heat exchanger 17.

[0031] The frequency conversion room of the present utility model dissipates heat through the cooperation of the water-cooling pipe 16, the heat exchanger 17 and the heat dissipation fan 18, with very high heat dissipation efficiency and good heat dissipation effect. Moreover, by arranging the water-cooling pipe 16, the heat exchanger 17 and the heat dissipation fan 18 at the upper ends of the transformer cabinet 12, the water-cooling cabinet 14 and the pre-charging switch cabinet 13, the space in the cabinet body 10 can be effectively utilized, the setting is reasonable, and the structure is more compact.

[0032] Preferably, as Figures 1 to 3As shown in the figure, the box body 10 is provided with a top plate 19 and side plates 20. The corresponding positions of the transformer cabinet 12, the water-cooling cabinet 14, and the pre-charging switch cabinet 13 on the top plate 19 are provided with grille plates 21 that are externally air-connected, and the positions corresponding to the upper parts of the transformer cabinet 12, the water-cooling cabinet 14, and the pre-charging switch cabinet 13 on the side plates 20 are provided with louvers 22.

[0033] In the frequency conversion room of the present utility model, the water-cooling pipe 16, the heat exchanger 17, and the cooling fan 18 are arranged inside the box body 10 and dissipate heat externally through the grille plates 21 and the louvers 22, which not only satisfies the integrity of the box body 10, facilitates overall hoisting, and has a high protection level, but also ensures the heat exchange between the water-cooling pipe 16, the heat exchanger 17, and the cooling fan 18 and the external air, and has a good heat dissipation effect.

[0034] Preferably, as Figure 4 shown, the transformer cabinet 12 includes a first cabinet body 23 and a transformer 24 arranged inside the first cabinet body 23. A pre-charge resistor assembly 25 is arranged at the front end of the transformer 24 inside the first cabinet body 23, and a filter RC assembly 26 is arranged at the rear end of the transformer 24 inside the first cabinet body 23.

[0035] The pre-charge resistor assembly 25 is usually arranged inside the pre-charging switch cabinet 13, and the filter RC assembly 26 is usually arranged inside the frequency converter cabinet 11. In the frequency conversion room of the present utility model, the pre-charge resistor assembly 25 and the filter RC assembly 26 are arranged inside the transformer cabinet 12, which can make full use of the space at the front end and the rear end inside the transformer 24, reduce the space inside the pre-charging switch cabinet 13 and the frequency converter cabinet 11, make the overall structure more compact and reasonable, and can effectively reduce the size of the frequency conversion room.

[0036] Preferably, as Figure 4 shown, the heat dissipation circulation pipeline 15 is arranged in a loop around the transformer 24 inside the first cabinet body 23, and a plurality of fan heat exchanger assemblies 27 are arranged at the corresponding positions of the heat dissipation circulation pipeline 15 on the side of the transformer 24.

[0037] The heat dissipation circulation pipeline 15 is arranged in a loop around the transformer 24, and the laying method of the heat dissipation circulation pipeline 15 can effectively cool down the transformer 24 and has a good heat dissipation effect. Arranging a plurality of fan heat exchanger assemblies 27 at the corresponding positions of the heat dissipation circulation pipeline 15 can increase the contact surface between the heat dissipation circulation pipeline 15 and the air, increase the heat dissipation surface, and further improve the heat dissipation efficiency.

[0038] Preferably, as Figure 2 and Figure 3As shown in the figure, the frequency converter cabinet 11 includes a second cabinet body 28, a rectification module 29, a first capacitor module 30, a first inverter module 31, a second capacitor module 32, a second inverter module 33, a control module 34, and a plurality of vertical partition plates 35. The vertical partition plates 35 divide the interior of the second cabinet body 28 into a first cavity 36, a second cavity 37, a third cavity 38, a fourth cavity 39, and a fifth cavity 40 from right to left in sequence. The rectification module 29 is arranged at the lower part of the first cavity 36, the first capacitor module 30 is arranged at the upper part of the first cavity 36, the first inverter module 31 is arranged in the second cavity 37, the second capacitor module 32 is arranged in the third cavity 38, the second inverter module 33 is arranged in the fourth cavity 39, and the control module 34 is arranged in the fifth cavity 40.

[0039] The vertical partition plates 35 of the frequency converter cabinet 11 divide the interior of the second cabinet body 28 into a first cavity 36, a second cavity 37, a third cavity 38, a fourth cavity 39, and a fifth cavity 40 from right to left in sequence. The rectification module 29 and the first capacitor module 30 are arranged together in the first cavity 36. In this way, the structure is compact, and the space inside the second cabinet body 28 is greatly saved. Since the weight of the rectification module 29 is heavier than that of the first capacitor module 30, arranging the rectification module 29 below the first capacitor module 30 is beneficial to the stability of the structure. Arranging the control module 34 in the fifth cavity 40 on the rightmost side is beneficial to separating the strong electricity and weak electricity of the second cabinet body 28, which is beneficial to electrical safety and maintenance.

[0040] The first inverter module 31 and the second inverter module 33 can drive two devices to work respectively, realizing the function of one - drive - two. Without setting up two frequency conversion rooms, two devices can be driven to work simultaneously, greatly improving the utilization rate of the devices.

[0041] The frequency converter cabinet 11 of the frequency conversion room of the present utility model is provided with two groups of capacitor modules, which can increase the capacitance, have a better filtering effect, can better stabilize the current, improve the efficiency, and reduce the current impact on the components. As can be seen from the above, the arrangement inside the frequency converter cabinet 11 of the frequency conversion room of the present utility model is reasonable, the structure is very compact, it can greatly save space, and has a large power density.

[0042] Preferably, as Figure 1 and Figure 2 shown, an air conditioner 41 is arranged at the rear of the frequency converter cabinet 11 in the cabinet body 10, and an air inlet grille 42 and an air outlet grille 43 are arranged at the position of the air conditioner 41 on the side plate 20.

[0043] The air conditioner 41 can dissipate heat from the space gaps inside the box body 10 between the frequency converter cabinet 11, the transformer cabinet 12, the pre-charge switch cabinet 13, and the water-cooled cabinet 14 respectively, preventing a large amount of heat from concentrating in this part of the space and causing the temperature to rise, thereby avoiding damage to the components inside the box body 10 due to overheating and ensuring that the overall temperature of the box body 10 is controlled within a reasonable range.

[0044] Preferably, as Figure 1 shown, several lighting lamps 44 are provided on the outer side surface of the box body 10. Above the control module 34 in the frequency converter cabinet 11, a first uninterruptible power supply 45 for supplying power to the lighting lamps 44 and a second uninterruptible power supply 46 for supplying power to external devices are provided.

[0045] Several lighting lamps 44 are provided on the outer side surface of the box body 10, which can provide lighting for maintenance personnel during night inspections or maintenance. The first uninterruptible power supply 45 supplies power to the lighting lamps 44, that is, in the case of a power outage in the frequency conversion room, the lighting lamps 44 can be powered by the first uninterruptible power supply 45, ensuring that after a night power outage, maintenance personnel can still provide lighting through the lighting lamps 44 for the maintenance of the box body 10. The second uninterruptible power supply 46 supplies power to external devices, that is, in the case of a power outage in the frequency conversion room, the external devices are powered by the second uninterruptible power supply 46, which can ensure that the external devices powered by the frequency conversion room can still operate normally under the condition of a power outage. The redundant setting of the frequency conversion room of the present utility model improves the reliability.

[0046] The first uninterruptible power supply 45 and the second uninterruptible power supply 46 are provided above the control module 34, effectively utilizing the space above the control module 34, with a very compact structure, increasing the functions of the frequency conversion room and improving the reliability of the frequency conversion room.

[0047] Preferably, as Figures 1 to 3 shown, a maintenance ladder 47 is provided on the side of the box body 10, and partition walls 48 are provided on both sides of the transformer cabinet 12 inside the box body 10.

[0048] A maintenance ladder 47 is provided on the side of the box body 10, which is beneficial for maintenance personnel to maintain the frequency conversion room through the ladder. Partition walls 48 are provided on both sides of the transformer cabinet 12 inside the box body 10, that is, according to needs, the box body 10 is divided into three independent spaces by the partition walls 48, and the frequency converter cabinet 11, the transformer cabinet 12, and the pre-charge switch cabinet 13 are respectively placed in the three independent spaces.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. A frequency conversion room, characterized in that, Including: A box body, an inverter cabinet, a transformer cabinet, and a precharge switch cabinet. The inverter cabinet, the transformer cabinet, and the precharge switch cabinet are sequentially arranged in the box body from left to right, and are electrically connected by busbars between the inverter cabinet and the transformer cabinet, and between the transformer cabinet and the precharge switch cabinet.

2. The variable-frequency room according to claim 1, wherein: The frequency conversion room is also provided with a water-cooled cabinet with heat dissipation pipes inside. The water-cooled cabinet is arranged behind the precharge switch cabinet in the box body. Heat dissipation circulation pipelines are arranged in both the inverter cabinet and the transformer cabinet. A water pump is arranged in the heat dissipation pipes, and the heat dissipation circulation pipelines are communicated with the heat dissipation pipes to form a closed-loop heat dissipation circuit.

3. The variable-frequency room according to claim 2, characterized in that: Water-cooled pipes are laid at the upper ends of the transformer cabinet, the water-cooled cabinet, and the precharge switch cabinet in the box body. The number of heat dissipation pipes of the water-cooled cabinet is two, namely a first heat dissipation pipe and a second heat dissipation pipe. The water outlet end of the heat dissipation circulation pipeline is connected to the water inlet end of the first heat dissipation pipe, the water outlet end of the first heat dissipation pipe is connected to the water inlet end of the water-cooled pipe, the water outlet end of the water-cooled pipe is connected to the water inlet end of the second heat dissipation pipe, the water outlet end of the second heat dissipation pipe is connected to the water inlet end of the heat dissipation circulation pipeline. A heat exchanger is arranged at the upper end of the water-cooled pipe. The water-cooled pipe is communicated with the heat dissipation pipe, and a heat dissipation fan is arranged at the upper end of the heat exchanger.

4. A frequency conversion room according to claim 3, characterized in that: The box body is provided with a top plate and side plates. The corresponding positions of the transformer cabinet, the water-cooled cabinet, and the precharge switch cabinet on the top plate are provided with grille plates communicating with the outside air, and the corresponding upper positions of the transformer cabinet, the water-cooled cabinet, and the precharge switch cabinet on the side plates are provided with louvers.

5. A variable-frequency room according to claim 4, characterized in that: The transformer cabinet includes a first cabinet body and a transformer arranged in the first cabinet body. A precharge resistor assembly is arranged at the front end of the transformer in the first cabinet body, and a filter RC assembly is arranged at the rear end of the transformer in the first cabinet body.

6. A variable-frequency room according to claim 5, characterized in that: The heat dissipation circulation pipeline is arranged in a zigzag shape around the transformer in the first cabinet body, and a plurality of fan heat exchanger assemblies are arranged at the corresponding positions of the heat dissipation circulation pipeline on the side of the transformer.

7. A frequency conversion room according to claim 6, characterized in that: The inverter cabinet includes a second cabinet body, a rectification module, a first capacitor module, a first inverter module, a second capacitor module, a second inverter module, a control module, and a plurality of vertical partitions. The vertical partitions divide the interior of the second cabinet body into a first cavity, a second cavity, a third cavity, a fourth cavity, and a fifth cavity from right to left in sequence. The rectification module is arranged at the lower part of the first cavity, the first capacitor module is arranged at the upper part of the first cavity, the first inverter module is arranged in the second cavity, the second capacitor module is arranged in the third cavity, the second inverter module is arranged in the fourth cavity, and the control module is arranged in the fifth cavity.

8. A frequency conversion room according to claim 7, characterized in that: An air conditioner is arranged behind the inverter cabinet in the box body, and an air inlet grille and an air outlet grille are arranged at the position of the air conditioner on the side plate.

9. A frequency conversion room according to claim 8, characterized in that: A plurality of lighting lamps are arranged on the outer side surface of the box body, and a first uninterruptible power supply for supplying power to the lighting lamps and a second uninterruptible power supply for supplying power to external devices are arranged above the control module in the inverter cabinet.

10. A frequency conversion room according to claim 9, characterized in that: A maintenance ladder is provided on the side of the box body, and partition walls are provided on both sides of the transformer cabinet inside the box body.

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