Frequency converter and container-type frequency conversion skid

Abstract

A frequency converter and a container-type frequency conversion skid. The frequency converter comprises a container body (10), wherein a first mounting area (110) and a second mounting area (120) are formed inside the container body (10), the first mounting area (110) is located below the second mounting area (120), a first opening (130) is formed at a first end side of the container body (10), and the first opening (130) is communicated with the first mounting area (110); a frequency conversion module (300) arranged in the first mounting area (110); a fan module (200) arranged in the second mounting area (120); a mounting frame (700) arranged at a first end side of the first mounting area (110), wherein a second opening (710) is formed in the mounting frame (700), and the first opening (130) is communicated with the second opening (710); a cold conduction module (400) comprising a cold conduction plate (410), wherein the cold conduction plate (410) is arranged on the side of the mounting frame (700) facing away from the first mounting area (110). The cold conduction plate (410) is arranged at an end side of the frequency converter (20), thereby preventing the cold conduction plate (410) from occupying the space in the container, and facilitating maintenance of electrical components.

Description

A frequency converter and container type frequency converter pry TECHNICAL FIELD

[0001] The utility model relates to drilling and production equipment technical field especially, relates to a kind of frequency converter and container type frequency converter pry. BACKGROUND

[0002] Container type frequency converter pry integrates components such as transformer, frequency converter, switchboard into integrated structure, to reduce the size of whole machine, improve the power of whole machine, and can simultaneously output multiple independent frequency conversion loops, to simultaneously provide power supply and speed regulation for multiple independent fracturing pump motors, improve operation efficiency.

[0003] For frequency converter, it generates a large amount of heat when working, needs to be cooled in time, to ensure the normal operation of internal electrical components. In the disclosed patent CN110913661A container type frequency converter pry, the side of the converter is provided with a cold guide plate, which cools the frequency converter through the cold guide plate. The cold guide plate extends along the length direction of the box body of the frequency converter pry, and the cold guide plate is located inside the box body. The cold guide plate occupies the internal space of the box body, which is not convenient for the maintenance of internal electrical components.

[0004] The above information disclosed in the background art is only used to increase the understanding of the background art of the present application, and therefore it can include prior art known by those skilled in the art. SUMMARY

[0005] In view of the problems pointed out in the background art, the utility model provides a kind of frequency converter and container type frequency converter pry, cold guide plate is arranged at the end side of frequency converter, avoid cold guide plate to occupy the space in the box, it is convenient for the maintenance of electrical components.

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

[0007] In some embodiments, a frequency converter is provided, comprising:

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

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

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

[0011] A mounting bracket is arranged at the first end side of the first installation area, and a second opening is arranged on the mounting bracket, and the first opening communicates with the second opening;

[0012] The cold conducting module comprises a cold conducting plate, which is arranged on the side of the mounting rack away from the first mounting area.

[0013] In some embodiments, the cold conducting module further comprises a cold conducting liquid pipeline and a cold conducting liquid tank, the cold conducting liquid pipeline is arranged between the cold conducting plate and the cold conducting liquid tank, and the cold conducting liquid tank is arranged on the fan module.

[0014] In some embodiments, the cold conducting liquid tank is arranged on the second side of the fan module, and the cold conducting liquid tank extends along the length direction of the tank.

[0015] In some embodiments, the first side of the fan module is provided with a mounting tank, the mounting tank is located at the first end side of the second mounting area, a water pump is arranged in the mounting tank, and the water pump is connected with the cold conducting liquid pipeline.

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

[0017] In some embodiments, the bottom of the tank is provided with a drainage part, and the drainage part is located below the cold conducting liquid pipeline.

[0018] In some embodiments, the cold conducting plate comprises a plurality of sub-cold conducting plates, and the cold conducting liquid pipeline comprises an inlet liquid pipeline and a return liquid pipeline.

[0019] The inlet liquid pipeline comprises a main inlet liquid pipeline and a plurality of sub-inlet liquid pipelines, the main inlet liquid pipeline is connected with the plurality of sub-inlet liquid pipelines, the main inlet liquid pipeline is connected with the outlet of the cold conducting liquid tank, and the plurality of sub-inlet liquid pipelines are respectively connected with the inlets of the plurality of sub-cold conducting plates.

[0020] The return liquid pipeline comprises a main return liquid pipeline and a plurality of sub-return liquid pipelines, the main return liquid pipeline is connected with the plurality of sub-return liquid pipelines, the main return liquid pipeline is connected with the inlet of the cold conducting liquid tank, and the plurality of sub-return liquid pipelines are respectively connected with the outlets of the plurality of sub-cold conducting plates.

[0021] In some embodiments, the cold conducting plate is connected with the mounting rack through screws, and the side of the cold conducting plate is connected with the mounting rack through a hinge.

[0022] In some embodiments, a set-type frequency conversion pry is provided, which comprises a main tank, three mounting spaces are formed in the main tank, the three mounting spaces are arranged in sequence along the length direction of the main tank, a frequency converter, a transformer and a power distribution cabinet are respectively arranged in the three mounting 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 this utility model are:

[0025] In the containerized inverter skid disclosed herein, a cold-conducting plate is positioned at one end of the inverter, without occupying internal space. The cold-conducting plate is positioned along the width of the inverter, which helps reduce its size. The cold-conducting plate is located adjacent to the first mounting area, where the inverter module is installed. As the coolant circulates through the cold-conducting plate, it carries away heat from the inverter module, achieving heat dissipation. The connection between the first and second openings increases the direct heat contact between the cold-conducting plate and the internal space of the inverter, further enhancing heat dissipation.

[0026] The transformer is an oil-immersed type, which reduces the waterproof requirements for the frequency converter skid, helps to reduce costs and improve equipment reliability.

[0027] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0030] Figure 2 is an internal view of a variable frequency skid according to some embodiments;

[0031] Figure 3 is a partial exploded view of a variable frequency skid according to some embodiments;

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

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

[0034] Figure 6 is an enlarged view of part A in Figure 5;

[0035] Figure 7 is an enlarged view of part B in Figure 6;

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

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For simplicity of the disclosure, the description below refers to the components of a specific example by reference number. In practice, each example can include components different from those described. Furthermore, the disclosure can be used in different examples having several or no components at all. For example, each of the processes can operate differently and still be in scope of the various examples of the present application. In other words, different relationships are possible between the various components depicted. The various embodiments can also be implemented in hardware, software, or a combination thereof. The several examples described can be combined in different combinations and / or can be separated into several different examples. For example, the scope of the application is not limited to combinations of all of the examples described but can also include other combinations.

[0043] The container type frequency conversion pry of the present disclosure, with reference to FIG. 1 and FIG. 2, comprises a main box body 10. The external contour of the main box body 10 is rectangular. Three installation spaces 11 are formed inside the main box body 10, 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 sequentially arranged along the length direction of the main box body 10.

[0044] The frequency converter 20, the transformer 30 and the 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.

[0045] In some embodiments, with reference to FIG. 2 and FIG. 3, the frequency converter 20 comprises a box body 100, which is part of the main box body 10. The inside of the box body 100 is formed with a first installation area 110 and a second installation area 120, and the first installation area 110 is below the second installation area 120. The first end side of the box body 100 is provided with a first opening 130, which is in communication 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, which is located at one end of the entire frequency conversion pry.

[0046] The frequency converter 20 comprises a frequency conversion module 300. The frequency conversion module 300 comprises a power capacitor 310, a rectifier, an inverter, etc. The frequency conversion module 300 is arranged in the first installation area 110, i.e. the frequency conversion module 300 is arranged below the frequency converter 20.

[0047] The frequency converter 20 comprises a fan module 200. The fan module 200 is arranged in the second installation area 120, i.e. the fan module 200 is arranged above the frequency converter 20, and the fan module 200 is above the frequency conversion module 300. The fan module 200 is in the top-out mode. The fan module 200 is configured to discharge the heat in the internal space of the frequency converter 20 to air cool and heat dissipate the frequency conversion module 300.

[0048] The frequency converter 20 comprises a mounting rack 700. The mounting rack 700 is fixedly arranged at the first end side of the first mounting area 110, at one end of the entire frequency converter. The mounting rack 700 is provided with a second opening 710, and the mounting rack 700 is a rectangular frame structure with a middle opening. The first opening 130 is in communication with the second opening 710.

[0049] The frequency converter 20 comprises a cooling guide module 400. The cooling guide module 400 comprises a cooling guide plate 410. The cooling guide plate 410 is arranged on the side of the mounting rack 700 away from the first mounting area 110, that is, the cooling guide plate 410 is arranged on the outer side of the mounting rack 700. The cooling guide plate 410 is arranged along the width direction of the frequency converter 20. The inner side of the mounting rack 700 is connected with the cabinet 100, and the outer side of the mounting rack 700 is connected with the cooling guide plate 410.

[0050] The cooling guide plate 410 circulates and flows with cooling liquid. Since the cooling guide plate 410 is arranged close to the first mounting area 110, and the frequency conversion module 300 is arranged in the first mounting area 110, the cooling guide plate 410 is arranged close to the frequency conversion module 300. When the cooling liquid circulates and flows through the cooling guide plate 410, the heat of the frequency conversion module 300 is taken away, achieving the heat dissipation effect of the frequency conversion module 300. The communication between the first opening 130 and the second opening 710 improves the direct contact of the cooling guide plate 410 with the heat in the internal space of the frequency converter 20, improving the heat dissipation effect.

[0051] The cooling guide plate 410 of the present disclosure is arranged at one end of the frequency converter 20, does not occupy the internal space of the frequency converter 20, and is arranged along the width direction of the frequency converter 20, which helps to reduce the size of the frequency converter 20.

[0052] In some embodiments, a first sealing ring 810 is arranged between the mounting rack 700 and the cabinet 100, and a second sealing ring 820 is arranged between the mounting rack 700 and the cooling guide plate 410. The first sealing ring 810 and the second sealing ring 820 play a double waterproof role, improve the waterproof performance of the frequency converter 20, and avoid the entry of external rainwater through the cooling guide plate 410 and the mounting rack 700 into the internal space of the frequency converter 20.

[0053] In some embodiments, referring to FIGS. 5 to 7, the cooling guide plate 410 is fixedly connected with the mounting rack 700 through a screw 720. The screw 720 is located between the first sealing ring 810 and the second sealing ring 820. The arrangement of the screw 720 has two aspects. First, it improves the connection reliability between the cooling guide plate 410 and the mounting rack 700. Second, it increases the clamping force between the cooling guide plate 410 and the mounting rack 700 through the fastening of the screw 720, and compresses the first sealing ring 810 and the second sealing ring 820, further improving the sealing and waterproof performance.

[0054] In some embodiments, referring to FIG. 4, the side of the cold guide plate 410 is connected with the mounting frame 700 through the hinge 730. After the screw 720 connecting the cold guide plate 410 and the mounting frame 700 is released, the cold guide plate 410 is opened like a door, facilitating the maintenance of the internal electrical devices of the frequency converter 20.

[0055] In some embodiments, the inner side of the cold guide plate 410 is provided with a rectifier and an inverter, and the cold guide plate 410 also serves as a mounting carrier of the rectifier and the inverter, further improving the structural compactness and helping to improve the heat dissipation effect of the cold guide plate 410 on the rectifier and the inverter.

[0056] In some embodiments, referring to FIG. 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 with the box body 100.

[0057] In some embodiments, referring to FIG. 3, FIG. 4 and FIG. 8, the cold guide module 400 further includes a cold guide liquid pipeline 420 and a cold guide liquid tank 430. The cold guide liquid pipeline 420 is arranged between the cold guide plate 410 and the cold guide liquid tank 430, and the cold guide liquid circulates between the cold guide liquid tank 430 and the cold guide plate 410.

[0058] In some embodiments, a water pump 440 is arranged on the cold guide liquid pipeline 420, and the water pump 440 provides power for the circulation of the cold guide liquid.

[0059] In some embodiments, the cold guide liquid tank 430 is arranged in the fan module 200, fully utilizing the top space of the frequency converter 20 and improving the structural compactness.

[0060] In some embodiments, the cold guide liquid tank 430 is fixedly arranged at the second side of the fan module 200, i.e. the cold guide liquid tank 430 is fixedly arranged at the second side of the fan frame 210. The cold guide liquid tank 430 extends along the length direction of the box body 100, fully utilizing the gap space between the fan frame 210 and the box body 100 and improving the structural compactness.

[0061] In some embodiments, the first side of the fan module 200 is provided with a mounting tank 450, which is located at the first end side of the second mounting area 120. The water pump 440 is arranged in the mounting tank 450 and connected with the cold guide liquid pipeline 420. The mounting tank 450 is located above the cold guide plate 410, fully utilizing the space at the end side of the fan module 200 and above the cold guide plate 410, improving the structural compactness and facilitating the routing of the cold guide liquid pipeline 420.

[0062] In some embodiments, the side of the installation box 450 is provided with a door body 451, and the door body 451 is opened to facilitate maintenance of the water pump 440 and the cooling liquid pipeline 420 in the installation box 450.

[0063] In some embodiments, the fan module 200 is provided with heat dissipation fins (not shown), and part of the cooling liquid pipeline 420 passes through the heat dissipation fins. The heat dissipation fins and the fan 220 are used to take away the heat of the cooling liquid in the cooling liquid pipeline 420, which helps to improve the heat dissipation effect of the cooling plate 410 and further improve the heat dissipation effect of the frequency converter 20.

[0064] In some embodiments, referring to FIG. 4, the cooling plate 410 is exposed outside the first installation area 110, that is, the cooling plate 410 is located outside the frequency converter 20. The exposure of the cooling plate 410 helps to discharge heat and improve the heat dissipation effect.

[0065] Part of the cooling liquid pipeline 420 is located on the side of the cooling plate 410 away from the first installation area 110, that is, the cooling liquid pipeline 420 between the installation box 450 and the cooling plate 410 is exposed, which facilitates the maintenance of the pipeline and does not occupy the internal space of the frequency converter 20.

[0066] In some embodiments, referring to FIG. 1, the bottom of the box body 100 is provided with a drainage part 600, and the drainage part 600 is located below the cooling liquid 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 is then discharged from the frequency converter 20, thereby avoiding water accumulation.

[0067] In some embodiments, referring to FIG. 4 and FIG. 8, the bottom of the cooling liquid pipeline 420 is provided with a support foot 460, which is seated on the hollow plate 610 and supports the cooling liquid pipeline 420, thereby improving the reliability of the pipeline.

[0068] In some embodiments, referring to FIG. 4, the cooling plate 410 includes a plurality of sub-cooling plates 411. The plurality of sub-cooling plates 411 are arranged in sequence along the width direction of the box body 100. Referring to FIG. 8, the cooling liquid pipeline 420 includes an inlet pipeline 421 and a return pipeline 422.

[0069] The inlet pipeline 421 includes a main inlet pipeline 4211 and a plurality of sub-inlet pipelines 4212. The main inlet pipeline 4211 is connected with the plurality of sub-inlet pipelines 4212. The main inlet pipeline 4211 is connected with the outlet of the cooling liquid tank 430, and the plurality of sub-inlet pipelines 4212 are respectively connected with the inlets of the plurality of sub-cooling plates 411.

[0070] 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 with the plurality of sub-liquid return pipelines 4222, the main liquid return pipeline 4221 is connected with the liquid inlet of the cooling liquid tank 430, and the plurality of sub-liquid return pipelines 4222 are respectively connected with the liquid outlets of the plurality of sub-cooling plates 411.

[0071] For example, referring to FIG. 4, the cooling plate 410 includes two sub-cooling plates 411, which are respectively referred to as a sub-cooling plate 411A and a sub-cooling plate 411B.

[0072] Referring to FIG. 8, the liquid inlet pipeline 421 includes a main liquid inlet pipeline 4211 and two sub-liquid inlet pipelines 4212, which are respectively referred to as a sub-liquid inlet pipeline 4212A and a sub-liquid inlet pipeline 4212B, the sub-liquid inlet pipeline 4212A is connected with the liquid inlet of the sub-cooling plate 411A, and the sub-liquid inlet pipeline 4212B is connected with 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, which are respectively referred to as a sub-liquid return pipeline 4222A and a sub-liquid return pipeline 4222B, the sub-liquid return pipeline 4222A is connected with the liquid outlet of the sub-cooling plate 411A, and the sub-liquid return pipeline 4222B is connected with the liquid outlet of the sub-cooling plate 411B.

[0073] In some embodiments, referring to FIG. 4, the main liquid inlet pipeline 4211 extends along the height direction of the tank body 100, the sub-liquid inlet pipeline 4212 is located below the cooling plate 410, the liquid return pipeline 422 is located above the cooling plate 410, and the cooling liquid flows from bottom to top in the cooling plate 410.

[0074] In some embodiments, a drainage port 470 is arranged on one of the sub-liquid inlet pipelines 4212 to facilitate the drainage of the cooling liquid in the pipeline during pipeline maintenance. The drainage port 470 is located above the drainage portion 600, and the drained cooling liquid falls into the drainage groove 620.

[0075] In some embodiments, referring to FIG. 2, the air conditioner 500 is arranged in the frequency converter 20 to further dissipate heat from the frequency converter 20.

[0076] The frequency converter 20 of the present disclosure dissipates heat through the triple action of the fan module 200, the cooling module 400, and the air conditioner 500, thereby improving the heat dissipation effect.

[0077] In some embodiments, in the disclosed container-type frequency converter pry, the transformer 30 is a dry-type transformer. In outdoor use conditions, the frequency converter pry needs to be provided with high waterproofness to ensure the use reliability of the dry-type transformer, which increases the processing and assembly requirements of the frequency converter pry and increases the cost.

[0078] Referring to Fig. 2, the transformer 30 of the present disclosure adopts an oil-immersed transformer 31, which reduces the waterproof requirement for the frequency conversion pry, helps to reduce the cost, and improves the equipment reliability.

[0079] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0081] Type a sequence listing free content description paragraph here.

Claims

1. A frequency converter, characterized in that The application relates to a frequency converter, comprising: a box body, wherein a first mounting area and a second mounting area are formed inside the box body, the first mounting area is located below the second mounting area, a first opening is arranged on a first end side of the box body, and the first opening is in communication with the first mounting area; a frequency conversion module arranged in the first mounting area; a fan module arranged in the second mounting area; a mounting rack arranged on the first end side of the first mounting area, wherein a second opening is arranged on the mounting rack, and the first opening is in communication with the second opening; a cooling liquid guiding module comprising a cooling liquid guiding plate, wherein the cooling liquid guiding plate is arranged on a side of the mounting rack away from the first mounting area.

2. The frequency converter according to claim 1, wherein the cooling liquid guiding module further comprises a cooling liquid pipe and a cooling liquid tank, the cooling liquid pipe is arranged between the cooling liquid guiding plate and the cooling liquid tank, and the cooling liquid tank is arranged on the fan module.

3. The frequency converter according to claim 2, wherein the cooling liquid tank is arranged on a 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, wherein a mounting tank is arranged on a first side of the fan module, the mounting tank is located on the first end side of the second mounting area, a water pump is arranged in the mounting tank, and the water pump is connected with the cooling liquid pipe.

5. The frequency converter according to claim 2, wherein the cooling liquid guiding plate is exposed outside the first mounting area, and part of the cooling liquid pipe is arranged on a side of the cooling liquid guiding plate away from the first mounting area.

6. The frequency converter according to claim 5, wherein a drainage part is arranged on the bottom of the box body, and the drainage part is located below the cooling liquid pipe.

7. The frequency converter according to any one of claims 1 to 6, wherein the cooling liquid guiding plate comprises a plurality of sub-cooling liquid guiding plates, and the cooling liquid pipe comprises an inlet liquid pipe and a return liquid pipe; the inlet liquid pipe comprises a main inlet liquid pipe and a plurality of sub-inlet liquid pipes, the main inlet liquid pipe is connected with the plurality of sub-inlet liquid pipes, the main inlet liquid pipe is connected with the outlet of the cooling liquid tank, and the plurality of sub-inlet liquid pipes are respectively connected with the inlet of the plurality of sub-cooling liquid guiding plates in correspondence; the return liquid pipe comprises a main return liquid pipe and a plurality of sub-return liquid pipes, the main return liquid pipe is connected with the plurality of sub-return liquid pipes, the main return liquid pipe is connected with the inlet of the cooling liquid tank, and the plurality of sub-return liquid pipes are respectively connected with the outlet of the plurality of sub-cooling liquid guiding plates in correspondence.

8. The frequency converter according to any one of claims 1 to 6, wherein the cooling liquid guiding plate is connected with the mounting rack through screws, and a side of the cooling liquid guiding plate is connected with the mounting rack through a hinge.

9. A packaged frequency converter sled, characterized by, The main box body is formed with three installation spaces arranged in sequence along the length direction of the main box body, and 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 according to any one of claims 1 to 8.

10. The packaged frequency conversion sled of claim 9, wherein, The transformer is an oil-immersed transformer.

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