Frequency converter and container type frequency conversion pry

Abstract

The frequency converter comprises a box body, a first installation area and a second installation area are formed in the box body, the first installation area is located below the second installation area, a first end side of the box body is provided with a first opening, the first opening is communicated with the first installation area, and a second end side of the box body is provided with a second opening. The frequency conversion module is arranged in the first installation area, the fan module is arranged in the second installation area, the installation frame is arranged on the first end side of the first installation area, a second opening is formed in the installation frame, the first opening communicates with the second opening, the cold conduction module comprises a cold conduction plate, and the cold conduction plate is arranged on the side, away from the first installation area, of the installation frame. The cold guide plate is arranged at the end side of the frequency converter, thereby preventing the cold guide plate from occupying the space in the box, and facilitating the maintenance of electrical components.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling and production equipment, in particular to an inverter and a containerized frequency conversion skid. Background Art

[0002] The containerized frequency conversion skid integrates components such as transformers, inverters, and distribution cabinets into an integrated structure to reduce the overall size of the machine, improve the overall power, and can simultaneously output multiple independent frequency conversion circuits to provide power and speed regulation for multiple independent fracturing pump motors at the same time, improving the operation efficiency.

[0003] For an inverter, a large amount of heat is generated during its operation and needs to be dissipated in time to ensure the normal operation of internal electrical components. In the publicly disclosed patent CN110913661A, a heat conduction plate is provided on the side of the inverter, and the inverter is cooled by the heat conduction plate. The heat conduction plate extends along the length direction of the box body of the frequency conversion skid, and the heat conduction plate is located inside the box body, occupying the internal space of the box body and not facilitating the maintenance of internal electrical components.

[0004] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0005] In view of the problems pointed out in the background art, the utility model provides an inverter and a containerized frequency conversion skid, in which the heat conduction plate is arranged on the end side of the inverter, avoiding the heat conduction plate occupying the internal space of the box and facilitating the maintenance of electrical components.

[0006] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions to implement:

[0007] In some embodiments, an inverter is provided, including:

[0008] A box body, with a first installation area and a second installation area formed inside. The first installation area is located below the second installation area. A first opening is provided on the first end side of the box body, and the first opening is communicated with the first installation area;

[0009] A frequency conversion module, arranged in the first installation area;

[0010] A fan module, arranged in the second installation area;

[0011] A mounting rack, arranged on the first end side of the first installation area. A second opening is provided on the mounting rack, and the first opening is communicated with the second opening;

[0012] The heat conduction module includes a heat conduction plate, and the heat conduction plate is arranged on the side of the mounting rack away from the first mounting area.

[0013] In some embodiments, the heat conduction module further includes a heat conduction liquid pipeline and a heat conduction liquid tank. The heat conduction liquid pipeline is arranged between the heat conduction plate and the heat conduction liquid tank, and the heat conduction liquid tank is arranged in the fan module.

[0014] In some embodiments, the heat conduction liquid tank is arranged on the second side part of the fan module, and the heat conduction liquid tank extends along the length direction of the box body.

[0015] In some embodiments, an installation box is arranged on the first side part of the fan module. The installation box is located at the first end side of the second installation area, and a water pump is arranged in the installation box. The water pump is connected with the heat conduction liquid pipeline.

[0016] In some embodiments, the heat conduction plate is exposed outside the first installation area, and part of the heat conduction liquid pipeline is located on the side of the heat conduction plate away from the first installation area.

[0017] In some embodiments, a drainage part is arranged at the bottom of the box body, and the drainage part is located below the heat conduction liquid pipeline.

[0018] In some embodiments, the heat conduction plate includes a plurality of sub - heat conduction plates, and the heat conduction liquid pipeline includes a liquid inlet pipeline and a liquid return pipeline;

[0019] The liquid inlet pipeline includes a main liquid inlet pipeline and a plurality of sub - liquid inlet pipelines. The main liquid inlet pipeline is connected with the plurality of sub - liquid inlet pipelines. The main liquid inlet pipeline is connected with the liquid outlet of the heat conduction liquid tank, and the plurality of sub - liquid inlet pipelines are respectively and correspondingly connected with the liquid inlets of the plurality of sub - heat conduction plates;

[0020] The liquid return pipeline includes a main liquid return pipeline and a plurality of sub - liquid return pipelines. The main liquid return pipeline is connected with the plurality of sub - liquid return pipelines. The main liquid return pipeline is connected with the liquid inlet of the heat conduction liquid tank, and the plurality of sub - liquid return pipelines are respectively and correspondingly connected with the liquid outlets of the plurality of sub - heat conduction plates.

[0021] In some embodiments, the heat conduction plate is connected with the mounting rack by screws, and the side part of the heat conduction plate is connected with the mounting rack by hinges.

[0022] In some embodiments, a containerized variable - frequency skid is provided, which includes a main box body. Three installation spaces are formed in the main box body. The three installation spaces are arranged in sequence along the length direction of the main box body. A frequency converter, a transformer and a power distribution cabinet are respectively arranged in the three installation spaces. The transformer is arranged between the frequency converter and the power distribution cabinet, and the frequency converter is the frequency converter as described above.

[0023] In some embodiments, the transformer is an oil-immersed transformer.

[0024] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0025] In the containerized frequency conversion skid of the present disclosure, the heat conduction plate is arranged at one end of the frequency converter, without occupying the internal space of the frequency converter. The heat conduction plate is arranged along the width direction of the frequency converter, which helps to reduce the size of the frequency converter. The heat conduction plate is arranged adjacent to the first installation area, and a frequency conversion module is arranged in the first installation area. The heat conduction plate is arranged adjacent to the frequency conversion module. When the heat conduction liquid circulates through the heat conduction plate, it takes away the heat of the frequency conversion module, achieving the heat dissipation effect of the frequency conversion module. The communication between the first opening and the second opening improves the direct contact between the heat conduction plate and the heat in the internal space of the frequency converter, improving the heat dissipation effect.

[0026] The transformer adopts an oil-immersed transformer, reducing the waterproof requirement for the frequency conversion skid, which helps to reduce costs and improve the reliability of the equipment.

[0027] After reading the specific embodiments of the present utility model in conjunction with the accompanying drawings, other features and advantages of the present utility model will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 A structural diagram of a frequency conversion skid according to some embodiments;

[0030] Figure 2 An internal view of a frequency conversion skid according to some embodiments;

[0031] Figure 3 A partial explosion view of a frequency conversion skid according to some embodiments;

[0032] Figure 4 A side view of a frequency conversion skid according to some embodiments;

[0033] Figure 5 A partial cross-sectional view of a frequency conversion skid according to some embodiments;

[0034] Figure 6 For Figure 5 The enlarged view of part A in

[0035] Figure 7 ForFigure 6 Enlarged view of part B;

[0036] Figure 8 It is a structural diagram of a fan module, a coolant tank, and a coolant pipeline according to some embodiments.

[0037] Reference numerals:

[0038] 10, main cabinet; 11, installation space;

[0039] 20, frequency converter;

[0040] 30, transformer; 31, oil-immersed transformer;

[0041] 40, power distribution cabinet;

[0042] 100, cabinet; 110, first installation area; 120, second installation area; 130, first opening;

[0043] 200, fan module; 210, fan frame; 220, fan;

[0044] 300, frequency conversion module; 310, power capacitor;

[0045] 400, cooling module; 410, cooling plate; 411, sub-cooling plate; 420, coolant pipeline; 421, inlet pipeline; 4211, main inlet pipeline; 4212, sub-inlet pipeline; 422, return pipeline; 4221, main return pipeline; 4222, sub-return pipeline; 430, coolant tank; 440, water pump; 450, installation box; 451, door body; 460, support feet; 470, drain port;

[0046] 500, air conditioner;

[0047] 600, drainage part; 610, hollow plate; 620, drainage groove;

[0048] 700, mounting bracket; 710, second opening; 720, screw; 730, hinge;

[0049] 810, first sealing ring; 820, second sealing ring. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0051] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0052] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0053] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In this utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0055] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0056] A containerized frequency conversion skid of the present disclosure, referring to Figure 1 and Figure 2 , includes a main box body 10. The outer contour of the main box body 10 is rectangular. Three installation spaces 11 are formed inside the main box body 10, which are respectively denoted as installation space 11A, installation space 11B, and installation space 11C. The installation space 11A, installation space 11B, and installation space 11C are arranged in sequence along the length direction of the main box body 10.

[0057] A frequency converter 20, a transformer 30, and a power distribution cabinet 40 are respectively arranged in the three installation spaces 11, and the transformer 30 is arranged between the frequency converter 20 and the power distribution cabinet 40. In other words, the frequency converter 20 is arranged in the installation space 11A, the transformer 30 is arranged in the installation space 11B, and the power distribution cabinet 40 is arranged in the installation space 11C.

[0058] In some embodiments, referring to Figure 2 and Figure 3 , the frequency converter 20 includes a box body 100, and the box body 100 is constituted by a part of the main box body 10. A first installation area 110 and a second installation area 120 are formed inside the box body 100, and the first installation area 110 is located below the second installation area 120. A first opening 130 is provided on the first end side of the box body 100, and the first opening 130 communicates with the first installation area 110. The first end side of the box body 100 is also the first end side of the main box body 10 and is located at one end of the entire frequency conversion skid.

[0059] The frequency converter 20 includes a frequency conversion module 300. The frequency conversion module 300 includes a power capacitor 310, a rectifier, an inverter, etc. The frequency conversion module 300 is arranged in the first installation area 110, that is, the frequency conversion module 300 is arranged below the frequency converter 20.

[0060] The inverter 20 includes a fan module 200. The fan module 200 is arranged in the second installation area 120, that is, the fan module 200 is arranged above the inverter 20, and the fan module 200 is located above the inverter module 300. The fan module 200 is a top air outlet mode. The fan module 200 is configured to discharge the heat in the internal space of the inverter 20 to perform air cooling and heat dissipation on the inverter module 300.

[0061] The inverter 20 includes a mounting frame 700. The mounting frame 700 is fixedly arranged at the first end side of the first mounting area 110, and is located at one end of the entire inverter sled. The mounting frame 700 is provided with a second opening 710, and the mounting frame 700 is a rectangular frame structure with a middle opening. The first opening 130 is connected to the second opening 710.

[0062] The inverter 20 includes a cooling module 400. The cooling module 400 includes a cooling plate 410. The cooling plate 410 is disposed on a side of the mounting frame 700 away from the first mounting area 110, that is, the cooling plate 410 is disposed on the outside of the mounting frame 700. The cooling plate 410 is disposed along the width direction of the inverter 20. The inner side of the mounting frame 700 is connected to the box 100, and the outer side of the mounting frame 700 is connected to the cooling plate 410.

[0063] The cooling liquid circulates in the cooling plate 410. Since the cooling plate 410 is disposed adjacent to the first installation area 110, and the frequency conversion module 300 is disposed in the first installation area 110, the cooling plate 410 is disposed adjacent to the frequency conversion module 300, and when the cooling liquid circulates through the cooling plate 410, it takes away the heat of the frequency conversion module 300, thereby achieving the heat dissipation effect of the frequency conversion module 300. The connection between the first opening 130 and the second opening 710 improves the direct contact between the cooling plate 410 and the heat of the internal space of the inverter 20, thereby improving the heat dissipation effect.

[0064] The cold conduction plate 410 of the present disclosure is disposed at one end of the inverter 20 and does not occupy the internal space of the inverter 20 . The cold conduction plate 410 is disposed along the width direction of the inverter 20 , which helps to reduce the size of the inverter 20 .

[0065] In some embodiments, a first sealing ring 810 is provided between the mounting frame 700 and the box body 100, and a second sealing ring 820 is provided between the mounting frame 700 and the cold plate 410. The first sealing ring 810 and the second sealing ring 820 play a dual waterproof role, improving the waterproof performance of the inverter 20 and preventing external rainwater from entering the interior of the inverter 20 through the cold plate 410 and the mounting frame 700.

[0066] In some embodiments, reference Figures 5 to 7, the cold plate 410 is fixedly connected to the mounting frame 700 by screws 720. The screws 720 are located between the first sealing ring 810 and the second sealing ring 820. The arrangement of the screws 720, on the one hand, improves the connection reliability between the cold plate 410 and the mounting frame 700; on the other hand, the tightening of the screws 720 increases the contact force between the cold plate 410 and the mounting frame 700, compresses the first sealing ring 810 and the second sealing ring 820, and further improves the sealing and waterproof performance.

[0067] In some embodiments, reference Figure 4 The side of the cold plate 410 is connected to the mounting frame 700 through a hinge 730. After the screws 720 connecting the cold plate 410 and the mounting frame 700 are released, the cold plate 410 is opened like a door to facilitate maintenance of the internal electrical components of the inverter 20.

[0068] In some embodiments, a rectifier and an inverter are disposed on the inner side of the cold plate 410 , and the cold plate 410 also serves as a mounting carrier for the rectifier and the inverter, further improving the compactness of the structure and helping to improve the heat dissipation effect of the cold plate 410 on the rectifier and the inverter.

[0069] In some embodiments, reference Figure 8 The fan module 200 includes a fan frame 210 and a fan 220. The fan frame 210 is a rectangular frame structure, and the fan 220 is fixedly arranged in the fan frame 210. The fan frame 210 is fixedly connected to the box body 100.

[0070] In some embodiments, reference Figure 3 , Figure 4 as well as Figure 8 The cooling module 400 further includes a cooling liquid pipeline 420 and a cooling liquid tank 430 . The cooling liquid pipeline 420 is disposed between the cooling plate 410 and the cooling liquid tank 430 . The cooling liquid circulates between the cooling liquid tank 430 and the cooling plate 410 .

[0071] In some embodiments, a water pump 440 is disposed on the cooling liquid pipeline 420 , and the water pump 440 provides power for the circulation of the cooling liquid.

[0072] In some embodiments, the cooling liquid tank 430 is disposed on the fan module 200 to fully utilize the top space of the inverter 20 and improve the compactness of the structure.

[0073] In some embodiments, the cooling liquid tank 430 is fixedly disposed on the second side of the fan module 200, that is, the cooling liquid tank 430 is fixedly disposed on the second side of the fan frame 210, and the cooling liquid tank 430 extends along the length direction of the box body 100, making full use of the gap space between the fan frame 210 and the box body 100 to improve the compactness of the structure.

[0074] In some embodiments, an installation box 450 is provided on the first side of the fan module 200. The installation box 450 is located at the first end side of the second installation area 120. A water pump 440 is arranged in the installation box 450, and the water pump 440 is connected to the coolant pipeline 420. The installation box 450 is located above the cold guide plate 410, making full use of the space on the end side of the fan module 200 and above the cold guide plate 410, improving the structural compactness, and also facilitating the routing of the coolant pipeline 420.

[0075] In some embodiments, a door body 451 is provided on the side of the installation box 450. The door body 451 is opened to facilitate the maintenance of the water pump 440 and the coolant pipeline 420 in the installation box 450.

[0076] In some embodiments, heat dissipation fins (not shown) are arranged in the fan module 200. Part of the coolant pipeline 420 passes through the heat dissipation fins, and the heat dissipation fins and the fan 220 are used to take away the heat of the coolant in the coolant pipeline 420, which helps to improve the heat dissipation effect of the cold guide plate 410, and further improves the heat dissipation effect of the frequency converter 20.

[0077] In some embodiments, referring to Figure 4 , the cold guide plate 410 is exposed outside the first installation area 110, that is, the cold guide plate 410 is located outside the frequency converter 20. The exposure of the cold guide plate 410 helps to discharge heat and improve the heat dissipation effect.

[0078] Part of the coolant pipeline 420 is located on the side of the cold guide plate 410 facing away from the first installation area 110, that is, the coolant pipeline 420 between the installation box 450 and the cold guide plate 410 is exposed, which is convenient for pipeline maintenance and does not occupy the internal space of the frequency converter 20.

[0079] In some embodiments, referring to Figure 1 , a drainage part 600 is provided at the bottom of the box body 100. The drainage part 600 is located below the coolant pipeline 420. The drainage part 600 includes a drainage groove 620 and a hollow plate 610. The hollow plate 610 is arranged at the top opening of the drainage groove 620. The water dripping from above falls into the drainage groove 620 through the hollow plate 610, and then is discharged from the frequency converter 20 to avoid water accumulation.

[0080] In some embodiments, referring to Figure 4 and Figure 8 , support feet 460 are arranged at the bottom of the coolant pipeline 420. The support feet 460 are seated on the hollow plate 610, which plays a supporting role for the coolant pipeline 420 and improves the reliability of the pipeline.

[0081] In some embodiments, referring to Figure 4 , the cold guide plate 410 includes a plurality of sub-cold guide plates 411. The plurality of sub-cold guide plates 411 are arranged in sequence along the width direction of the box body 100. Referring toFigure 8 The coolant pipeline 420 includes a liquid inlet pipeline 421 and a liquid return pipeline 422.

[0082] The liquid inlet pipeline 421 includes a main liquid inlet pipeline 4211 and a plurality of sub-liquid inlet pipelines 4212. The main liquid inlet pipeline 4211 is connected to the plurality of sub-liquid inlet pipelines 4212. The main liquid inlet pipeline 4211 is connected to the liquid outlet of the coolant tank 430. The plurality of sub-liquid inlet pipelines 4212 are respectively and correspondingly connected to the liquid inlets of the plurality of sub-cooling plates 411.

[0083] The liquid return pipeline 422 includes a main liquid return pipeline 4221 and a plurality of sub-liquid return pipelines 4222. The main liquid return pipeline 4221 is connected to the plurality of sub-liquid return pipelines 4222. The main liquid return pipeline 4221 is connected to the liquid inlet of the coolant tank 430. The plurality of sub-liquid return pipelines 4222 are respectively and correspondingly connected to the liquid outlets of the plurality of sub-cooling plates 411.

[0084] For example, referring to Figure 4 the cooling plate 410 includes two sub-cooling plates 411, denoted as sub-cooling plate 411A and sub-cooling plate 411B respectively.

[0085] Referring to Figure 8 the liquid inlet pipeline 421 includes a main liquid inlet pipeline 4211 and two sub-liquid inlet pipelines 4212, denoted as sub-liquid inlet pipeline 4212A and sub-liquid inlet pipeline 4212B respectively. The sub-liquid inlet pipeline 4212A is connected to the liquid inlet of the sub-cooling plate 411A, and the sub-liquid inlet pipeline 4212B is connected to the liquid inlet of the sub-cooling plate 411B. The liquid return pipeline 422 includes a main liquid return pipeline 4221 and two sub-liquid return pipelines 4222, denoted as sub-liquid return pipeline 4222A and sub-liquid return pipeline 4222B respectively. The sub-liquid return pipeline 4222A is connected to the liquid outlet of the sub-cooling plate 411A, and the sub-liquid return pipeline 4222B is connected to the liquid outlet of the sub-cooling plate 411B.

[0086] In some embodiments, referring to Figure 4 the main liquid inlet pipeline 4211 extends along the height direction of the cabinet 100. The sub-liquid inlet pipelines 4212 are located below the cooling plate 410, and the liquid return pipeline 422 is located above the cooling plate 410. The coolant flows upward in the cooling plate 410.

[0087] In some embodiments, a drain port 470 is provided on one of the sub-liquid inlet pipelines 4212 to facilitate draining the coolant in the pipeline during pipeline maintenance. The drain port 470 is located above the drainage part 600, and the drained coolant falls into the drainage trough 620.

[0088] In some embodiments, referring to Figure 2 an air conditioner 500 is provided inside the frequency converter 20 to further dissipate heat from the frequency converter 20.

[0089] The frequency converter 20 of the present disclosure dissipates heat through the triple effects of the fan module 200, the heat conduction module 400, and the air conditioner 500, improving the heat dissipation effect.

[0090] In some embodiments, in a disclosed containerized frequency conversion skid, the transformer 30 is a dry-type transformer. Under outdoor operating conditions, affected by weather such as rain, the frequency conversion skid needs to be set with high waterproofness to ensure the reliable use of the dry-type transformer, which improves the processing and assembly requirements of the frequency conversion skid and increases the cost.

[0091] Refer to Figure 2 , the transformer 30 of the present disclosure adopts an oil-immersed transformer 31, reducing the waterproof requirement for the frequency conversion skid, helping to reduce costs and improve the reliability of the equipment.

[0092] In the description of the above embodiments, the specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0093] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A frequency converter, characterized in that, include: A box body, a first installation area and a second installation area are formed inside, the first installation area is located below the second installation area, a first end side of the box body is provided with a first opening, and the first opening is communicated with the first installation area; A frequency conversion module is arranged in the first installation area; A fan module is arranged in the second installation area; A mounting frame, arranged at a first end side of the first mounting area, the mounting frame being provided with a second opening, the first opening being in communication with the second opening; The cooling module comprises a cooling plate, wherein the cooling plate is arranged on a side of the mounting frame away from the first mounting area.

2. The frequency converter according to claim 1, characterized in that: The cooling module further includes a cooling liquid pipeline and a cooling liquid tank. The cooling liquid pipeline is arranged between the cooling plate and the cooling liquid tank. The cooling liquid tank is arranged on the fan module.

3. The frequency converter according to claim 2, characterized in that: The cooling liquid tank is arranged on the second side of the fan module, and the cooling liquid tank extends along the length direction of the box body.

4. The frequency converter according to claim 3, characterized in that: A mounting box is disposed on the first side of the fan module, and the mounting box is located at the first end side of the second mounting area. A water pump is disposed in the mounting box, and the water pump is connected to the cooling liquid pipeline.

5. The frequency converter according to claim 2, characterized in that: The cooling plate is exposed outside the first installation area, and part of the cooling liquid pipeline is located on a side of the cooling plate away from the first installation area.

6. The frequency converter according to claim 5, characterized in that: A drainage portion is provided at the bottom of the box body, and the drainage portion is located below the cooling liquid pipeline.

7. The frequency converter according to any one of claims 2 to 6, characterized in that: The cooling plate includes a plurality of sub-cooling plates, and the cooling liquid pipeline includes a liquid inlet pipeline and a liquid return pipeline; The liquid inlet pipeline includes a main liquid inlet pipeline and a plurality of sub-liquid inlet pipelines, the main liquid inlet pipeline is connected to the plurality of sub-liquid inlet pipelines, the main liquid inlet pipeline is connected to the liquid outlet of the cooling liquid tank, and the plurality of sub-liquid inlet pipelines are respectively connected to the liquid inlets of the plurality of sub-cooling plates; The liquid return pipeline includes a main liquid return pipeline and multiple sub-liquid return pipelines. The main liquid return pipeline is connected to the multiple sub-liquid return pipelines. The main liquid return pipeline is connected to the liquid inlet of the cooling liquid tank. The multiple sub-liquid return pipelines are respectively connected to the liquid outlets of the multiple sub-cooling plates.

8. The frequency converter according to any one of claims 1 to 6, characterized in that: The cooling plate is connected to the mounting frame via screws, and the side of the cooling plate is connected to the mounting frame via hinges.

9. A containerized variable-frequency skid, characterized in that, It includes a main box body, in which three installation spaces are formed, and the three installation spaces are arranged in sequence along the length direction of the main box body. The three installation spaces are respectively provided with a frequency converter, a transformer and a distribution cabinet, and the transformer is arranged between the frequency converter and the distribution cabinet. The frequency converter is the frequency converter according to any one of claims 1 to 8.

10. The containerized variable-frequency skid according to claim 9, wherein, the transformer is an oil-immersed transformer.

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