Frequency converter

Abstract

A frequency converter comprises a box body, a rectification module, a first capacitor module, a first inversion module, a control module, a plurality of vertical partition plates and a plurality of conductive busbars, the vertical partition plates divide the interior of the box body into a first cavity, a second cavity and a third cavity from left to right at a time, and the rectification module is arranged on the lower portion of the first cavity; the first capacitor module is arranged at the upper part of the first cavity, the first inversion module is arranged in the second cavity, the control module is arranged in the third cavity, the rectification module and the first capacitor module, and the first inversion module and the first capacitor module are connected through a conductive busbar. The frequency converter is reasonable in arrangement, compact in structure, small in size, large in power density, stable, firm and reliable in structure, convenient to install and transfer, and very high in efficiency.

Description

Technical Field

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

[0002] The frequency converter is a power control device that controls the AC motor by changing the frequency of the motor's working power supply.

[0003] Conventional inverters consist of a rectifier cabinet, inverter cabinet, capacitor cabinet, and control cabinet, each of which is connected via external wiring to achieve overall functionality. Because conventional inverters consist of individual functional cabinets, they are not compact, bulky, and have low power density. Furthermore, the need for multiple cabinets leads to high cabinet costs. Furthermore, because these multiple cabinets require external wiring, installation or transport requires the hoisting, installation, and wiring of each cabinet individually, resulting in inefficient and inconvenient installation and transport.

[0004] Therefore, there is an urgent need to develop a frequency converter with high power density, small size, compact structure, and easy installation and transportation. Utility Model Content

[0005] The purpose of the present invention is to avoid the deficiencies in the prior art and to provide a frequency converter with high power density, small size, compact structure, and convenient installation and transportation, in order to solve the above technical problems.

[0006] A frequency converter includes: a casing, a rectifier module, a first capacitor module, a first inverter module, a control module, a plurality of vertical partitions and a plurality of conductive busbars, wherein the vertical partitions divide the interior of the casing into a first cavity, a second cavity and a third cavity from left to right, the rectifier module is arranged in the lower part of the first cavity, the first capacitor module is arranged in the upper part of the first cavity, the first inverter module is arranged in the second cavity, and the control module is arranged in the third cavity, and the rectifier module and the first capacitor module are connected through the conductive busbars.

[0007] Preferably, a fourth cavity is provided between the second cavity and the third cavity inside the above-mentioned box body, separated by the vertical partition, and the inverter also includes a second inverter module, which is arranged in the fourth cavity, and the second inverter module is connected to the first capacitor module through the conductive busbar.

[0008] Preferably, a fifth cavity is provided between the second cavity and the fourth cavity inside the above-mentioned box body, separated by the vertical partition, and the inverter also includes a second capacitor module, which is arranged in the fifth cavity, and the second capacitor module and the first capacitor module are connected in parallel through the conductive busbar.

[0009] Preferably, both ends of the conductive busbar are provided with detachable copper bars, and the conductive busbar is respectively connected to the rectifier module, the first capacitor module, the first inverter module, the second capacitor module and the second inverter module through the copper bars.

[0010] Preferably, a wire trough for passing the vertical partition plate is provided on the top of the box body, and the inverter also includes a control line. The first inverter module and the second inverter module are electrically connected to the control module through the control line respectively, and the control line is provided in the wire trough.

[0011] Preferably, the above-mentioned box is also provided with a number of transverse partitions and external cables connecting the rectifier module. The first cavity, the second cavity, the fourth cavity and the fifth cavity are respectively divided into four layers from top to bottom by the transverse partitions. The first capacitor module is layered on the upper two layers of the first cavity, the rectifier module is arranged on the third layer of the first cavity, and the external cable is arranged on the fourth layer of the first cavity.

[0012] Preferably, the first capacitor module and the second capacitor module are respectively provided with a plurality of capacitors, and the inverter is also provided with a plurality of laminated busbars. The capacitors in the first capacitor module and the capacitors in the second capacitor module are respectively connected in parallel through the laminated busbars. The conductive busbar, the laminated busbar and the copper busbar are all arranged at the rear of the box. The conductive busbar passes through the vertical partition, and the vertical partition is provided with a wire hole at the place where the conductive busbar passes through.

[0013] Preferably, a first air outlet is provided at the upper end of the vertical partition between the first cavity and the second cavity, a second air outlet is provided at the lower end of the vertical partition between the first cavity and the second cavity, a first heat exchanger matching the size of the second air outlet is provided at the position of the second air outlet of the first cavity, and a first fan is provided on the side of the first heat exchanger away from the second air outlet.

[0014] Preferably, a third air outlet is provided at the upper end of the vertical partition between the fifth cavity and the fourth cavity, a fourth air outlet is provided at the lower end of the vertical partition between the fifth cavity and the fourth cavity, a second heat exchanger matching the size of the fourth air outlet is provided at the position of the fourth air outlet of the fifth cavity, and a second fan is provided on the side of the second heat exchanger away from the fourth air outlet.

[0015] Preferably, several small third heat exchangers are arranged in the above-mentioned first inverter module, the second inverter module and the rectifier module, and a hot water exchange pipe assembly is arranged at the rear of the box body. The hot water exchange pipe assembly includes a horizontally arranged water inlet main pipe and a water outlet main pipe located at the lower part of the box body, a plurality of vertically arranged water inlet branches connected to the water inlet main pipe, and a plurality of vertically arranged water outlet branches connected to the water outlet main pipe. The first heat exchanger, the second heat exchanger and the third heat exchanger are respectively connected to one of the water inlet branches and one of the water outlet branches.

[0016] The utility model uses a frequency converter to divide the housing into a first cavity, a second cavity, and a third cavity by means of vertical partitions. Since the rectifier module is relatively small, the rectifier module and the first capacitor module are arranged together in the first cavity. This makes the structure compact and greatly saves space inside the housing. Since the rectifier module is heavier than the first capacitor module, the rectifier module is arranged below the first capacitor module, which is beneficial to the stability of the structure. Since the rectifier module needs to be connected to external cables, the rectifier module is arranged in the lower part of the first cavity, which is beneficial to the connection between the rectifier module and the external cables. The control module is arranged in the third cavity on the far right, which is beneficial to separating the strong current and weak current of the housing, which is beneficial to electrical safety and repair and maintenance.

[0017] The rectifier module, the first capacitor module, the first inverter module, and the control module of the frequency converter of the present invention are arranged in a box. The arrangement is reasonable, the structure is compact, the volume is small, the power density is large, and the structure is stable, firm, and reliable. This greatly saves the overall space of the frequency converter, and the structure realizes the separation of strong and weak electricity inside the frequency converter, which is beneficial to electrical safety and repair and maintenance. The frequency converter of the present invention sets all components in a box. During installation and transportation, only one box needs to be hoisted, which avoids the hoisting, adjustment, installation and wiring of each cabinet in the prior art. The installation and transportation are convenient and the efficiency is very high. In addition, the frequency converter of the present invention sets all components in a box. There is no need to set up multiple cabinets with different functions as in the prior art, which greatly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0019] Figure 1 This is a front structural diagram of a frequency converter of the present utility model;

[0020] Figure 2 This is a front view frame structure diagram of a frequency converter of the utility model;

[0021] Figure 3 This is a rear view structural diagram of a frequency converter of the present utility model;

[0022] Figure 4 This is a schematic diagram of the connection structure of the conductive busbar, laminated busbar and copper busbar of a frequency converter of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a heat exchange water pipe assembly of an energy storage module of a frequency converter of the present utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described with reference to the following embodiments and accompanying drawings:

[0025] A frequency converter, such as Figures 1 to 4 As shown, it includes: a box 10, a rectifier module 11, a first capacitor module 12, a first inverter module 13, a control module 14, several vertical partitions 15 and several conductive busbars 16. The vertical partitions 15 divide the interior of the box 10 from left to right into a first cavity 17, a second cavity 18 and a third cavity 19. The rectifier module 11 is arranged in the lower part of the first cavity 17, the first capacitor module 12 is arranged in the upper part of the first cavity 17, the first inverter module 13 is arranged in the second cavity 18, and the control module 14 is arranged in the third cavity 19. The rectifier module 11 and the first capacitor module 12, and the first inverter module 13 and the first capacitor module 12 are connected through the conductive busbar 16.

[0026] The inverter of the present invention divides the housing 10 into a first cavity 17, a second cavity 18, and a third cavity 19 by means of a vertical partition 15, resulting in a simple structure. Since the rectifier module 11 is relatively small, the rectifier module 11 and the first capacitor module 12 are disposed together within the first cavity 17, resulting in a compact structure and significantly saving space within the housing 10. Since the rectifier module 11 is heavier than the first capacitor module 12, disposing the rectifier module 11 below the first capacitor module 12 contributes to structural stability. Furthermore, since the rectifier module 11 requires connection to an external cable 27, disposing the rectifier module 11 below the first cavity 17 facilitates connection between the rectifier module 11 and the external cable 27. Placing the control module 14 in the rightmost third cavity 19 helps separate the high-voltage and low-voltage circuits within the housing 10, facilitating electrical safety and maintenance.

[0027] The rectifier module 11, the first capacitor module 12, the first inverter module 13, and the control module 14 of the frequency converter of the present invention are arranged in a box 10. The arrangement is reasonable, the structure is compact, the volume is small, the power density is large, and the structure is stable, firm and reliable, which greatly saves the overall space of the frequency converter. In addition, the structure realizes the separation of strong and weak electricity inside the frequency converter, which is beneficial to electrical safety and repair and maintenance. The frequency converter of the present invention sets all components in a box 10. During installation and transportation, only one box 10 needs to be hoisted, which avoids the hoisting, adjustment, installation and wiring of each cabinet in the prior art. The installation and transportation are convenient and the efficiency is very high. In addition, the frequency converter of the present invention sets all components in a box 10. There is no need to set up multiple cabinets with different functions as in the prior art, which greatly saves costs.

[0028] Preferably, if Figures 1 to 4 As shown, a fourth cavity 20 is provided between the second cavity 18 and the third cavity 19 inside the box 10, separated by a vertical partition 15. The frequency converter also includes a second inverter module 21, which is provided in the fourth cavity 20. The second inverter module 21 is connected to the first capacitor module 12 via a conductive busbar 16. The second inverter module 21 is provided in the fourth cavity 20, and the structure is compact, which further improves the power density. That is, the frequency converter of the present invention can drive two devices to work respectively through the first inverter module 13 and the second inverter module 21, realizing a one-to-two function. It can drive two devices to work at the same time without setting up two sets of frequency converters, which greatly improves the utilization rate of the equipment.

[0029] Specifically, the first inverter module 13 and the second inverter module 21 may be integrated gate-commutated thyristor (IGCT) inverter modules. Of course, they may also be inverter modules composed of other components in the prior art as needed.

[0030] Preferably, if Figures 1 to 4 As shown, a fifth cavity 22 is provided between the second cavity 18 and the fourth cavity 20 within the housing 10, separated by a vertical partition 15. The inverter further includes a second capacitor module 23, which is disposed in the fifth cavity 22. The second capacitor module 23 is connected in parallel with the first capacitor module 12 via a conductive busbar 16. The second capacitor module 23 is connected in parallel with the first capacitor module 12 via the conductive busbar 16. The inverter of the present invention connects more capacitor modules in parallel, increasing the capacitance, achieving better filtering effects, better current stabilization, improving efficiency, and reducing current impact on components.

[0031] Preferably, if Figure 4As shown, detachable copper bars 24 are provided at both ends of the conductive busbar 16, and the conductive busbar 16 is connected to the rectifier module 11, the first capacitor module 12, the first inverter module 13, the second capacitor module 23, and the second inverter module 21 through the copper bars 24. That is, the inverter of the utility model can disconnect the connections between the rectifier module 11, the first capacitor module 12, the first inverter module 13, the second capacitor module 23, and the second inverter module 21 by disassembling the copper bars 24 connecting the rectifier module 11, the first capacitor module 12, the first inverter module 13, the second capacitor module 23, and the second inverter module 21 without removing the entire conductive busbar 16, so as to facilitate the withstand voltage test of the rectifier module 11, the first capacitor module 12, the first inverter module 13, the second capacitor module 23, and the second inverter module 21 separately, and the installation test is very convenient. Moreover, when a single faulty module needs to be replaced or maintained, the circuit connection of the corresponding module can be disconnected by removing the corresponding copper bus 24, which is very convenient for maintaining and replacing the faulty module.

[0032] Preferably, if Figures 1 to 4 As shown, a wire trough 25 is provided at the top of the housing 10 through which the vertical partition plate 15 is passed. The inverter also includes a control wire (not shown in the figure). The first inverter module 13 and the second inverter module 21 are electrically connected to the control module 14 through the control wires (not shown in the figure), and the control wires (not shown in the figure) are provided in the wire trough 25. The control wires (not shown in the figure) are provided in the wire trough 25 located at the top of the housing 10. The control wires (not shown in the figure) are arranged neatly and can be protected by the wire trough 25 to prevent the wire trough 25 from being broken due to other entanglements.

[0033] Preferably, if Figures 1 to 4As shown, the box 10 is also provided with a number of transverse partitions 26 and an external cable 27 connecting the rectifier module 11. The first cavity 17, the second cavity 18, the fourth cavity 20 and the fifth cavity 22 are respectively divided into four layers from top to bottom by the transverse partitions 26. The first capacitor module 12 is layered on the upper two layers of the first cavity 17, the rectifier module 11 is arranged on the third layer of the first cavity 17, and the external cable 27 is arranged on the fourth layer of the first cavity 17. Of course, the first cavity 17, the second cavity 18, the fourth cavity 20 and the fifth cavity 22 can also be divided into three layers, five layers, etc. according to the power or electrical design requirements. The first cavity 17, the second cavity 18, the fourth cavity 20 and the fifth cavity 22 are divided into four layers by the transverse partitions 26, which facilitates the neat installation of each module and each component, makes the internal structure of the box 10 more compact and beautiful, and further improves the space utilization rate within the box 10. The first capacitor module 12 is layered on the upper two layers of the first cavity 17, the rectifier module 11 is arranged on the third layer of the first cavity 17, and the external cable 27 is arranged on the fourth layer of the first cavity 17. Placing the heavy rectifier module 11 on the third layer is beneficial to the stability of the structure. Placing the external cable 27 on the fourth layer of the first cavity 17 facilitates the wiring of the external cable 27 and the connection with the rectifier module 11.

[0034] Preferably, if Figures 1 to 4 As shown, the first capacitor module 12 and the second capacitor module 23 are respectively provided with a plurality of capacitors 28, and the frequency converter is also provided with a plurality of laminated busbars 29. The capacitors 28 in the first capacitor module 12 and the capacitors 28 in the second capacitor module 23 are respectively connected in parallel through the laminated busbars 29. The conductive busbar 16, the laminated busbar 29 and the copper busbar 24 are all arranged at the rear of the box 10. The conductive busbar 16 is penetrated by a vertical partition 15, and the vertical partition 15 is provided with a threading hole (not shown in the figure) at the place where the conductive busbar 16 is penetrated. The capacitors 28 in the first capacitor module 12 and the capacitors 28 in the second capacitor module 23 are respectively connected in parallel through the laminated busbar 29. The connection structure is simple and the connection effect is good. The conductive busbar 16, the laminated busbar 29 and the copper busbar 24 are all arranged at the rear of the box 10. On the one hand, it facilitates the unified wiring of the frequency converter, is neat and beautiful, and is easy to maintain later; on the other hand, it reduces the length of the conductive busbar 16 between each module and saves the conductive busbar 16 material. The vertical partition 15 is provided with a wire hole (not marked in the figure) at the place where the conductive busbar 16 is passed through. The wire hole (not marked in the figure) satisfies the connection of the conductive busbar 16 between each module, and the wire hole (not marked in the figure) can be set to a size that just passes through the conductive busbar 16, which is beneficial to the isolation of each cavity from each other.

[0035] Preferably, if Figure 1 and Figure 2As shown, a first air outlet 30 is provided at the upper end of the vertical partition 15 between the first cavity 17 and the second cavity 18, and a second air outlet 31 is provided at the lower end of the vertical partition 15 between the first cavity 17 and the second cavity 18. A first heat exchanger 32 that matches the size of the second air outlet 31 is provided at the position of the second air outlet 31 of the first cavity 17, and a first fan 37 is provided on the side of the first heat exchanger 32 away from the second air outlet 31.

[0036] The first cavity 17 and the second cavity 18 are set as a circulating air duct. When dissipating heat, the first fan 37 is turned on. Under the suction of the first fan 37, the hot cooling air in the second cavity 18 enters the first cavity 17 through the second air outlet 31; when passing through the first heat exchanger 32, due to the heat exchange effect of the first heat exchanger 32, the hot cooling air is reduced to cold cooling air. The cold cooling air flows upward in the first cavity 17 under the blowing force of the first fan 37. During the upward flow, the cooling air dissipates heat for the module in the first cavity 17; then the cooling air flows back to the second cavity 18 from the first air outlet 30 at the upper end. Under the suction of the first fan 37, the cooling air flows downward in the second cavity 18, and the cooling air dissipates heat for the first inverter module 13 in the second cavity 18. Finally, under the suction of the first fan 37, the hot cooling air in the second cavity 18 enters the first cavity 17 through the second air outlet 31, and this cycle is repeated to complete the heat dissipation of the components in the first cavity 17 and the second cavity 18, with good heat dissipation effect and high heat dissipation efficiency.

[0037] Preferably, if Figure 1 and Figure 2 As shown, a third air outlet 33 is provided at the upper end of the vertical partition 15 between the fifth cavity 22 and the fourth cavity 20, and a fourth air outlet 34 is provided at the lower end of the vertical partition 15 between the fifth cavity 22 and the fourth cavity 20. A second heat exchanger 35 that matches the size of the fourth air outlet 34 is provided at the position of the fourth air outlet 34 of the fifth cavity 22, and a second fan 36 is provided on the side of the second heat exchanger 35 away from the fourth air outlet 34.

[0038] The fifth cavity 22 and the fourth cavity 20 are set as a circulating air duct. When dissipating heat, the second fan 36 is turned on. Under the suction of the second fan 36, the hot cooling air in the fourth cavity 20 enters the fifth cavity 22 through the fourth air outlet 34; when passing through the second heat exchanger 35, due to the heat exchange effect of the second heat exchanger 35, the hot cooling air is reduced to cold cooling air. The cold cooling air flows upward in the fifth cavity 22 under the blowing force of the second fan 36. During the upward flow, the cooling air dissipates heat for the second capacitor module 23 in the fifth cavity 22; then the cooling air flows back to the fourth cavity 20 from the third air outlet 33 at the upper end, and flows downward in the fourth cavity 20 under the suction of the second fan 36, and dissipates heat for the second inverter module 21 in the fourth cavity 20. Finally, under the suction of the second fan 36, the hot cooling air in the fourth cavity 20 enters the fifth cavity 22 through the fourth air outlet 34, and this cycle is repeated to complete the heat dissipation of the components in the fifth cavity 22 and the fourth cavity 20, with good heat dissipation effect and high heat dissipation efficiency.

[0039] Because the heat generated by the first capacitor module 12 and the second capacitor module 23 is greater than the heat generated by the first inverter module 13 and the second inverter module 21, the first cavity 17 and the second cavity 18 are set as a circulating air duct, and the fifth cavity 22 and the fourth cavity 20 are set as a circulating air duct, that is, the first capacitor module 12 and the first inverter module 13 are set in a circulating air duct, and the second capacitor module 23 and the second inverter module 21 are set in a circulating air duct. This can make the heat generated by each air duct more balanced, with good thermal balance, and there will be no large amount of heat accumulation, which is beneficial to the heat dissipation of each component in each circulating air duct and has a good heat dissipation effect.

[0040] Preferably, if Figures 1 to 5 As shown, several small third heat exchangers (not shown in the figure) are arranged in the first inverter module 13, the second inverter module 21 and the rectifier module 11, and a hot water exchange pipe assembly 38 is arranged at the rear of the box body 10. The hot water exchange pipe assembly 38 includes a horizontally arranged water inlet main pipe 39 and a water outlet main pipe 40 located at the lower part, a plurality of vertically arranged water inlet branches 41 connected to the water inlet main pipe 39, and a plurality of vertically arranged water outlet branches 42 connected to the water outlet main pipe 40. The first heat exchanger 32, the second heat exchanger 35 and the third heat exchanger (not shown in the figure) are respectively connected to a water inlet branch pipe 41 and a water outlet branch pipe 42.

[0041] The first heat exchanger 32, the second heat exchanger 35, and the third heat exchanger (not shown) can be water or other liquid heat dissipation media. During heat dissipation, the cold heat dissipation media enters through the water inlet main pipe 39 and then flows into the various water inlet branches 41. The heat dissipation media then enters the first heat exchanger 32, the second heat exchanger 35, and the third heat exchanger (not shown) through the water inlet branches 41, respectively. Heat exchange occurs within the first heat exchanger 32, the second heat exchanger 35, and the third heat exchanger (not shown). After absorbing heat, the hot heat dissipation media flows out of the first heat exchanger 32, the second heat exchanger 35, and the third heat exchanger (not shown), respectively, and then flows out through the water outlet branch pipe 42 and the water outlet main pipe 40. The first heat exchanger 32, the second heat exchanger 35, and the third heat exchanger (not shown) dissipate heat through liquid heat dissipation media such as water, resulting in good heat dissipation effect and high heat dissipation efficiency. Placing the heat exchange water pipe assembly 38 at the rear of the housing 10 facilitates uniform installation and a neat and aesthetically pleasing appearance. The water inlet main pipe 39 and the water outlet main pipe 40 are arranged at the lower part of the box body 10, which fully utilizes the space layout and saves volume.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A frequency converter, characterized in that: include: A box body, a rectifier module, a first capacitor module, a first inverter module, a control module, several vertical partitions and several conductive busbars, the vertical partitions divide the interior of the box body from left to right into a first cavity, a second cavity and a third cavity, the rectifier module is arranged in the lower part of the first cavity, the first capacitor module is arranged in the upper part of the first cavity, the first inverter module is arranged in the second cavity, and the control module is arranged in the third cavity. The rectifier module and the first capacitor module, and the first inverter module and the first capacitor module are connected through the conductive busbar.

2. A frequency converter according to claim 1, characterized in that: A fourth cavity is provided between the second cavity and the third cavity inside the box body, separated by the vertical partition. The inverter also includes a second inverter module, which is arranged in the fourth cavity. The second inverter module is connected to the first capacitor module through the conductive busbar.

3. A frequency converter according to claim 2, characterized in that: A fifth cavity is provided between the second cavity and the fourth cavity inside the box body, separated by the vertical partition. The inverter also includes a second capacitor module, which is arranged in the fifth cavity. The second capacitor module is connected in parallel with the first capacitor module through the conductive busbar.

4. A frequency converter according to claim 3, characterized in that: Both ends of the conductive busbar are respectively provided with detachable copper bars, and the conductive busbar is respectively connected to the rectifier module, the first capacitor module, the first inverter module, the second capacitor module and the second inverter module through the copper bars.

5. The frequency converter according to claim 4, characterized in that: A wire trough for passing through the vertical partition is provided at the top of the box body. The inverter also includes a control line. The first inverter module and the second inverter module are electrically connected to the control module through the control line respectively. The control line is provided in the wire trough.

6. The frequency converter according to claim 5, characterized in that: The box is also provided with several transverse partitions and external cables connecting the rectifier module. The first cavity, the second cavity, the fourth cavity and the fifth cavity are respectively divided into four layers from top to bottom by the transverse partitions. The first capacitor module is layered on the upper two layers of the first cavity, the rectifier module is arranged on the third layer of the first cavity, and the external cables are arranged on the fourth layer of the first cavity.

7. The frequency converter according to claim 6, characterized in that: The first capacitor module and the second capacitor module are respectively provided with a plurality of capacitors, and the inverter is also provided with a plurality of laminated busbars. The capacitors in the first capacitor module and the capacitors in the second capacitor module are respectively connected in parallel through the laminated busbars. The conductive busbar, the laminated busbar and the copper busbar are all arranged at the rear of the box. The conductive busbar passes through the vertical partition, and the vertical partition is provided with a wire threading hole at the conductive busbar passing through.

8. The frequency converter according to claim 7, characterized in that: A first air outlet is provided at the upper end of the vertical partition between the first cavity and the second cavity, and a second air outlet is provided at the lower end of the vertical partition between the first cavity and the second cavity. A first heat exchanger matching the size of the second air outlet is provided at the position of the second air outlet of the first cavity, and a first fan is provided on the side of the first heat exchanger away from the second air outlet.

9. The frequency converter according to claim 8, characterized in that: A third air outlet is provided at the upper end of the vertical partition between the fifth cavity and the fourth cavity, and a fourth air outlet is provided at the lower end of the vertical partition between the fifth cavity and the fourth cavity. A second heat exchanger having a size matching that of the fourth air outlet is provided at the position of the fourth air outlet of the fifth cavity, and a second fan is provided on the side of the second heat exchanger away from the fourth air outlet.

10. The frequency converter according to claim 9, characterized in that: Several small third heat exchangers are arranged in the first inverter module, the second inverter module and the rectifier module. A hot water exchange pipe assembly is arranged at the rear of the box body. The hot water exchange pipe assembly includes a horizontally arranged water inlet main pipe and a water outlet main pipe located at the lower part of the box body, a plurality of vertically arranged water inlet branches connected to the water inlet main pipe, and a plurality of vertically arranged water outlet branches connected to the water outlet main pipe. The first heat exchanger, the second heat exchanger and the third heat exchanger are respectively connected to one of the water inlet branches and one of the water outlet branches.

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