Variable frequency device

Abstract

The application discloses a variable frequency device. The variable frequency device comprises a shell, a variable frequency component, a current collecting component and a fan component, the shell is provided with a mounting cavity, the variable frequency component is mounted in the mounting cavity, the current collecting component is connected to the shell, the current collecting component is provided with an air duct, the air duct is communicated with the mounting cavity, and the variable frequency component is at least partially located in the air duct; and the fan component is used at least for discharging gas in the air duct. The application solves the problem of low heat dissipation efficiency of the variable frequency device.

Description

Technical Field

[0001] This application relates to the field of frequency conversion technology, and more specifically, to a frequency conversion device. Background Technology

[0002] Variable frequency drive (VFD) equipment is a power control device that uses VFD technology and microelectronics to control a motor by changing the frequency of the power supply. VFD equipment typically consists of a control cabinet, transformer cabinet, and power cabinet. During operation, VFD equipment generates a significant amount of heat. Current technology usually involves installing fans on the top of each cabinet for heat dissipation, but this method is relatively inefficient. Utility Model Content

[0003] The main objective of this application is to provide a frequency converter to solve the problem of low heat dissipation efficiency in existing frequency converters.

[0004] According to one aspect of this application, a frequency converter is provided, comprising:

[0005] A housing, wherein an installation cavity is provided within the housing;

[0006] A frequency converter component, wherein the frequency converter component is installed within the mounting cavity;

[0007] A current collector is connected to the housing, and an air duct is provided inside the current collector. The air duct communicates with the mounting cavity, and the frequency converter is at least partially located inside the air duct.

[0008] A fan component, the fan component being used at least to discharge gas from the air duct.

[0009] Furthermore, the frequency conversion component includes a power unit, a transformer unit, and a control unit.

[0010] The current collection component includes:

[0011] An internal current collector is disposed within the mounting cavity and connected to the top surface of the mounting cavity. A first chamber is disposed within the internal current collector and communicates with the mounting cavity. The transformer unit is at least partially located within the first chamber.

[0012] An external collector is disposed outside the housing and connected between the outer wall of the housing and the fan component. A second chamber is provided inside the external collector. The first chamber and the second chamber are interconnected to form the air duct.

[0013] Furthermore, the internal current collector includes:

[0014] A flow guide cover is attached to the top surface of the mounting cavity;

[0015] The top end of the air duct is connected to the bottom of the air guide and communicates with the cavity inside the air guide to form the first chamber, and the transformer unit extends at least partially into the air duct.

[0016] Furthermore, the transformer unit includes three winding coils, and the air duct includes three, with the three winding coils and the three air ducts arranged in a one-to-one correspondence, and the winding coils at least partially extending into the air ducts.

[0017] Furthermore, a first channel is provided through the top of the housing, the first channel connecting the first chamber and the second chamber;

[0018] The external current collector includes:

[0019] A flow collector cover is attached to the upper surface of the housing and forms the second chamber. The flow collector covers the first channel. The fan component is connected to the flow collector along the height direction of the housing.

[0020] Furthermore, the outer edge of the flow collector is provided with a flange, which is attached to the upper surface of the housing and connected by a locking member.

[0021] Furthermore, along the height direction of the housing, a second channel is provided through the upper surface of the housing, the second channel connecting the second chamber and the mounting cavity, and the external manifold covers the second channel.

[0022] Furthermore, the fan component includes an exhaust fan, and the collector component has a clearance hole on the side near the exhaust fan, the clearance hole communicating with the air duct, and the exhaust fan installed in the clearance hole; and / or,

[0023] The fan components include at least three, which are arranged at intervals along the length of the housing. Further, the housing is provided with an air inlet channel communicating with the mounting cavity. A louver is provided at the inlet of the air inlet channel, and a filter element is provided on the side of the louver closest to the mounting cavity.

[0024] Furthermore, along the length direction of the housing, the power unit is arranged close to the inner wall of the housing, and the transformer unit is arranged at intervals with the power unit. A partition is provided in the mounting cavity, and the partition and the inner wall of the mounting cavity form a control compartment. The control compartment is located on one side of the transformer unit along the width direction of the housing, and the control unit is located in the control compartment.

[0025] In this application, by at least partially locating the transformer unit within the air duct, the substantial heat generated during transformer unit operation can be more directly introduced into the air duct. Since the exhaust fan is connected to the air duct, the heat within the air duct can be rapidly exhausted to the outside of the casing, improving the heat dissipation efficiency of the frequency converter. For the transformer unit, where heat generation is particularly significant, this application enhances heat dissipation, thereby effectively improving the heat dissipation efficiency of the frequency converter.

[0026] Secondly, this application installs the frequency converter components within a mounting cavity and uses a current collector and a fan component to dissipate heat from the cavity. This means the fan component can simultaneously act on and dissipate heat from the power unit, transformer unit, and control unit of the frequency converter, thus increasing its effective range. Compared to existing technologies, this application reduces the number of fan components, lowering the manufacturing cost of the frequency converter. Simultaneously, this application mounts the power unit, transformer unit, and control unit all within a single housing, facilitating transportation and reducing transportation costs. The frequency converter can be transported as a complete unit, reducing assembly steps and improving assembly efficiency. The higher integration of the frequency converter also reduces its size, further facilitating transportation. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the frequency converter disclosed in this application;

[0029] Figure 2 This is a front view of the frequency converter disclosed in this application;

[0030] Figure 3 This is a schematic diagram of the current collection component disclosed in this application;

[0031] Figure 4 This is a schematic diagram of the internal current collector disclosed in this application;

[0032] Figure 5 This is a schematic diagram of the external current collector disclosed in this application;

[0033] Figure 6 This is a schematic diagram of the structure when no external current collector is installed on the housing;

[0034] Figure 7 This is a cross-sectional view of the frequency converter.

[0035] Figure 8 This is a schematic diagram of the structure inside the mounting cavity.

[0036] The above figures include the following reference numerals:

[0037] 10. Housing; 11. Mounting cavity; 12. First channel; 13. Second channel; 14. Air inlet channel; 15. Louver; 16. Partition; 17. Control compartment; 20. Air collection component; 200. Air duct; 21. Clearance hole; 22. Internal air collection component; 221. First chamber; 222. Air guide cover; 223. Air duct; 23. External air collection component; 231. Second chamber; 232. Air collection cover; 233. Flanged edge; 30. Fan component. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0041] like Figures 1 to 8As shown, this application provides a frequency converter. The frequency converter includes a housing 10, a power unit, a transformer unit, a control unit, a current collector 20, and a fan assembly 30. A mounting cavity 11 is provided within the housing 10. The power unit, transformer unit, and control unit are all installed within the mounting cavity 11. The current collector 20 is connected to the housing 10. An air duct 200 is provided within the current collector 20. The air duct 200 communicates with the mounting cavity 11. The transformer unit is at least partially located within the air duct 200. The fan assembly 30 includes an exhaust fan. A clearance hole 21 is provided on the side of the current collector 20 near the exhaust fan. The clearance hole 21 communicates with the air duct 200. The exhaust fan is installed in the clearance hole 21.

[0042] In this embodiment, by at least partially arranging the transformer unit within the air duct 200, the large amount of heat generated during the operation of the transformer unit can be more directly introduced into the air duct 200. Since the exhaust fan is connected to the air duct 200, the heat within the air duct 200 can be quickly exhausted to the outside of the housing 10 by the exhaust fan, improving the heat dissipation efficiency of the frequency converter. For the transformer unit, which exhibits significant heat generation, this application strengthens the heat dissipation of the transformer unit, thereby effectively improving the heat dissipation efficiency of the frequency converter.

[0043] Secondly, this application mounts the power unit, transformer unit, and control unit all within the mounting cavity 11, and uses a current collector 20 and a fan component 30 to dissipate heat from the mounting cavity 11. This means the fan component 30 can simultaneously act on and dissipate heat from all three components, increasing its effective range. Compared to existing technologies, this application reduces the number of exhaust fans, lowering the manufacturing cost of the frequency converter. Simultaneously, mounting the power unit, transformer unit, and control unit within a single housing 10 facilitates wiring between units, improves transportability, and reduces transportation costs. The frequency converter can be transported as a complete unit, reducing assembly steps and improving assembly efficiency. The higher integration of the frequency converter also reduces its size, further facilitating transport.

[0044] The clearance hole 21 is used to install an exhaust fan, which allows the exhaust fan to discharge hot air from the air duct 200 to the outside of the housing 10. The clearance hole 21 also ensures that the exhaust fan can be accurately installed on the manifold 20.

[0045] The transformer unit performs phase shifting and voltage reduction, distributing its output voltage to the power unit. The power unit rectifies and inverts the input voltage, and through the superposition of multiple cascaded modules, outputs the voltage required to control the load. The control unit analyzes the various analog and digital signals collected, issues control commands, and controls the operation of the entire frequency converter. The frequency converter also has many protection functions, such as overcurrent, overvoltage, and overload protection. The frequency converter adjusts the output voltage and frequency to provide the power supply voltage according to the actual needs of the motor, thereby achieving energy saving and speed regulation.

[0046] In some embodiments, the current collection component 20 includes an internal current collection component 22 and an external current collection component 23. The internal current collection component 22 is disposed within the mounting cavity 11 and connected to the top surface of the mounting cavity 11. A first chamber 221 is disposed within the internal current collection component 22, communicating with the mounting cavity 11, and the transformer unit is at least partially located within the first chamber 221. The external current collection component 23 is disposed outside the housing 10 and connected between the outer wall of the housing 10 and the fan component 30. A second chamber 231 is disposed within the external current collection component 23, and the first chamber 221 and the second chamber 231 communicate with each other to form an air duct 200. The first chamber 221 within the internal manifold 22 is connected to the mounting cavity 11, ensuring good stability for the internal manifold 22. It also precisely collects heat from the mounting cavity 11 and the transformer unit, transferring the heat to the second chamber 231. This guides the airflow, allowing hot air to escape more smoothly and improving the heat dissipation efficiency of the inverter equipment. The external manifold 23 is located outside the housing 10, avoiding occupying space within the housing 10 and extending the airflow path for smoother hot air exhaust. Simultaneously, the external manifold 23 acts as a transitional connection between the housing 10 and the fan component 30, ensuring precise alignment between the duct 200 and the fan component 30 and reducing airflow leakage. The first chamber 221 and the second chamber 231 are connected to form an air duct 200, realizing the connection between internal heat collection and external exhaust. The internal heat collector 22 focuses on the efficient collection of heat in the mounting cavity 11, while the external heat collector 23 is responsible for orderly exporting heat to the fan component 30. The internal heat collector 22 and the external heat collector 23 work together to form a continuous, low-resistance channel for airflow from the inside to the outside, further improving the concentration and efficiency of heat dissipation and enhancing heat dissipation efficiency. In addition, the external heat collector 23 is located outside the housing 10, and some heat can also be directly dissipated through the outer surface of the external heat collector 23.

[0047] Furthermore, the internal airflow collector 22 includes a shroud 222 and a duct 223. The shroud 222 is fitted over the top surface of the mounting cavity 11. The top end of the duct 223 is connected to the bottom of the shroud 222 and communicates with the cavity inside the shroud 222 to form a first chamber 221. The transformer unit extends at least partially into the duct 223. The shroud 222 of the internal airflow collector 22, fitted over the top surface of the mounting cavity 11, can utilize the top space to form a closed cavity structure, providing a containment area for heat accumulation, and can also be quickly connected to the top surface of the mounting cavity 11 through the fitted design, simplifying the assembly process. The top end of the duct 223 is connected to the bottom of the shroud 222 and communicates with the cavity of the shroud 222 to form the first chamber 221. The tubular structure of the duct 223 can further constrain the airflow direction and prevent heat from mixing with the cold air in the mounting cavity 11. Meanwhile, the air duct 223 extends into the mounting cavity 11, allowing the airflow path to be closer to the transformer unit. The transformer unit extends at least partially into the air duct 223, placing the high-heat-generating transformer unit directly within the air duct 223, thus enhancing heat dissipation efficiency. The air guide 222 and the air duct 223 collect heat within the mounting cavity 11, and the directional guidance of the air duct 223 precisely delivers the heat to the subsequent second chamber 231, improving the concentration of heat collection and the smoothness of airflow transmission.

[0048] Furthermore, the transformer unit includes three winding coils. There are three air ducts 223, with each winding coil corresponding to one of the three air ducts 223, and at least a portion of the winding coil extends into the air duct 223. This one-to-one correspondence between the three winding coils of the transformer unit and the three air ducts 223, with at least a portion of the winding coil extending into the corresponding air duct 223, ensures that each high-heat-generating winding coil has an independent airflow channel, guaranteeing that each winding coil receives cooling airflow. The independent arrangement of the three air ducts 223 allows for precise airflow distribution based on the heating status of each winding coil, improving the uniformity of heat dissipation. Simultaneously, the independent air ducts 223 reduce thermal interference between the winding coils, preventing heat transfer within the air ducts 223 and thus reducing cooling efficiency. The partial extension of the winding coils into the air ducts 223 shortens the distance between the winding coils and the airflow, enhancing the directness of heat exchange. Combined with the directional airflow guidance of the air ducts 223, the heat generated by each winding coil is quickly carried away by the airflow, further improving the cooling effect.

[0049] In some embodiments, a first channel 12 is provided through the top of the housing 10, connecting a first chamber 221 and a second chamber 231. The external current collector 23 includes a current collector hood 232. The current collector hood 232 covers the upper surface of the housing 10 and forms the second chamber 231. The current collector hood 232 covers the first channel 12 and extends along the height direction of the housing 10 (e.g., along the height direction of the housing 10). Figure 1(In the direction indicated by the middle arrow Z), the fan component 30 is connected to the shroud 232. The first channel 12 at the top of the housing 10 connects the first chamber 221 and the second chamber 231, providing a precise flow path for the transfer of internal heat to the outside, avoiding heat retention inside the housing 10, and ensuring that the heat collected in the first chamber 221 can be efficiently introduced into the second chamber 231 and dissipated. The shroud 232 of the external collector 23 covers the upper surface of the housing 10 and forms the second chamber 231, and covers the first channel 12. It can quickly connect to the housing 10 through the cover structure, and can completely bring the hot air discharged from the first channel 12 into the second chamber 231 to prevent heat leakage. At the same time, the closed space formed by the shroud 232 can further constrain the airflow direction, providing a stable airflow environment for the exhaust of the fan component 30. By connecting the fan component 30 to the shroud 232 along the height direction of the housing 10, a natural exhaust gradient can be formed by utilizing the height difference, reducing the resistance during the exhaust process, and enabling the fan component 30 to more efficiently draw hot air from the second chamber 231, forming a continuous and efficient heat dissipation path from the inside to the outside, which greatly improves the efficiency of heat transfer and exhaust.

[0050] Furthermore, the outer edge of the shroud 232 is provided with a flange 233, which is attached to the upper surface of the housing 10 and connected by a locking device. The flange 233 on the outer edge of the shroud 232 is attached to the upper surface of the housing 10, which increases the contact area between the shroud 232 and the housing 10, making the connection more stable, effectively avoiding gaps caused by vibration, preventing hot air from leaking from the connection, ensuring the airtightness of the second chamber 231, and allowing hot air to flow into the second chamber 231 more quickly. The flange 233 is connected to the housing 10 by the locking device, which not only facilitates the quick assembly and disassembly of the shroud 232 and the housing 10, which is beneficial for later maintenance, but also further strengthens the fit through the locking force, improving the tightness of the connection between the shroud 232 and the housing 10, allowing the shroud 232 to remain stable under the airflow impact generated by the operation of the fan component 30, ensuring the reliability of the overall structure of the air duct 200, and thus maintaining the high efficiency of the heat dissipation path.

[0051] In some embodiments, a second channel 13 is provided through the upper surface of the housing 10 along the height direction. The second channel 13 connects the second chamber 231 and the mounting cavity 11, and the external collector 23 covers the second channel 13. When the frequency converter is running, the power unit also generates heat. This heat can flow into the second chamber 231 through the second channel 13 with the airflow and be discharged by the exhaust fan. The second channel 13 also provides an additional flow path for hot air in the mounting cavity 11, avoiding airflow congestion that may occur with a single channel and enhancing the flexibility of heat dissipation. The second channel 13, in conjunction with the first channel 12, allows heat from different areas in the mounting cavity 11 to enter the second chamber 231 through different channels, improving the heat dissipation efficiency of the frequency converter.

[0052] Furthermore, the exhaust fans include at least three, and the at least three exhaust fans are arranged along the length of the housing 10 (e.g., Figure 1 (As indicated by the middle arrow X) The exhaust fans are arranged at intervals. Multiple exhaust fans can significantly increase the total exhaust volume and enhance the ability to extract hot air within the duct 200, avoiding heat accumulation caused by insufficient exhaust from a single exhaust fan. The interval arrangement along the length direction allows for more even coverage of different areas of the duct 200, ensuring that hot air from all locations within the second chamber 231 and even the entire duct 200 is effectively exhausted, reducing localized heat retention. Combined with the continuous duct 200 formed by the collector component 20, this further enhances the comprehensiveness and efficiency of heat dissipation. Furthermore, when one exhaust fan fails, the remaining exhaust fans can still meet the heat dissipation requirements.

[0053] In some embodiments, the housing 10 is provided with an air inlet channel 14, which communicates with the mounting cavity 11. A louver 15 is provided at the inlet of the air inlet channel 14, and a filter is provided on the side of the louver 15 closest to the mounting cavity 11. The air inlet channel 14 on the housing 10, communicating with the mounting cavity 11, provides a path for external cold air to enter the mounting cavity 11, enabling effective convection with the exhaust fan, replenishing the cold air, promoting heat exchange circulation, and improving heat dissipation efficiency. The louver 15 at the inlet of the air inlet channel 14 can control the air intake by adjusting the blade angle and can also block larger external debris from entering, providing initial protection. The filter covering the side of the louver 15 closest to the mounting cavity 11 further filters dust, particulate matter, and other contaminants from the air, preventing them from entering the mounting cavity 11 and adhering to components such as the power unit and transformer unit, affecting performance or lifespan.

[0054] In some embodiments, along the length of the housing 10, the power unit is arranged close to the inner wall of the housing 10, and the transformer unit is arranged at a distance from the power unit. A partition 16 is provided in the mounting cavity 11, and the partition 16 and the inner wall of the mounting cavity 11 form a control compartment 17. The control compartment 17 is located on one side of the transformer unit along the width direction of the housing 10, and the control unit is located in the control compartment 17. The transformer unit and the power unit are arranged at a distance to avoid heat superposition caused by close contact, reduce mutual thermal interference, and facilitate heat dissipation. The partition 16 and the inner wall of the mounting cavity 11 form the control compartment 17, in which the control unit is placed and located on one side of the transformer unit along the width direction. This not only protects the temperature-sensitive control unit through physical isolation and reduces the impact of heat generated by high-heat components such as the transformer unit, but also makes the layout of each functional unit more regular, facilitating wiring, maintenance, and orderly airflow. The control compartment 17 is located on one side of the transformer unit along the width direction of the housing 10. It can also improve the utilization rate of the space in the mounting cavity 11, improve the integration of the frequency converter, and reduce the size of the frequency converter.

[0055] In summary, this application offers the following advantages: The integrated design of this frequency converter allows for overall transportation, unlike conventional split-structure frequency converters, significantly simplifying transportation and installation processes and reducing costs. The transformer employs a duct-type structure, with its top directly sealed to the top of the mounting cavity via a guide shroud, effectively separating hot and cold air inside the casing and greatly improving heat dissipation efficiency. The power unit layout is rational and simple, facilitating cable routing, reducing wiring complexity, and improving equipment stability and maintainability. A second chamber is added to the top of the cabinet, connecting the heat dissipation ducts of the transformer and power units within this chamber, optimizing the heat dissipation path and improving efficiency. Furthermore, the addition of the second chamber enables redundant exhaust fans. Previously, a conventional redundant exhaust fan solution required four fans; now, with the second chamber, the improved internal airflow efficiency allows only three exhaust fans to meet the redundancy requirement. Operating only two of the three exhaust fans ensures normal operation of the frequency converter, saving equipment costs and energy consumption. Meets European CE standards, allowing for smooth adoption in the European market. Its integrated structure facilitates transportation and installation, improving work efficiency. A unique heat dissipation structure and a rational power unit layout enhance the equipment's heat dissipation efficiency and stability. Optimized fan redundancy saves costs and energy.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0058] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A frequency converter, characterized in that, include: The housing (10) has an installation cavity (11) inside. A frequency converter is installed in the mounting cavity (11); A current collector (20) is connected to the housing (10). An air duct (200) is provided inside the current collector (20). The air duct (200) communicates with the mounting cavity (11). The frequency converter is located at least partially inside the air duct (200). A fan component (30) is used at least to discharge gas from the air duct (200).

2. The frequency converter according to claim 1, characterized in that, The frequency converter includes a power unit, a transformer unit, and a control unit, and the current collector (20) includes: An internal current collector (22) is disposed in the mounting cavity (11) and connected to the top surface of the mounting cavity (11). A first chamber (221) is disposed in the internal current collector (22), and the first chamber (221) communicates with the mounting cavity (11). The transformer unit is at least partially located in the first chamber (221). An external collector (23) is disposed outside the housing (10) and connected between the outer wall of the housing (10) and the fan component (30). A second chamber (231) is provided inside the external collector (23). The first chamber (221) and the second chamber (231) are interconnected to form the air duct (200).

3. The frequency converter according to claim 2, characterized in that, The internal manifold (22) includes: A flow guide (222) is attached to the top surface of the mounting cavity (11); The top of the air duct (223) is connected to the bottom of the flow guide (222) and communicates with the cavity inside the flow guide (222) to form the first chamber (221). The transformer unit extends at least partially into the air duct (223).

4. The frequency converter according to claim 3, characterized in that, The transformer unit includes three winding coils, and the air duct (223) includes three. The three winding coils are arranged in a one-to-one correspondence with the three air ducts (223), and the winding coils extend at least partially into the air ducts (223).

5. The frequency converter according to claim 2, characterized in that, The top of the housing (10) is provided with a first channel (12), which connects the first chamber (221) and the second chamber (231). The external current collector (23) includes: A flow collector (232) is attached to the upper surface of the housing (10) and surrounds it to form the second chamber (231). The flow collector (232) covers the first channel (12). Along the height direction of the housing (10), the fan component (30) is connected to the flow collector (232).

6. The frequency converter according to claim 5, characterized in that, The outer edge of the shroud (232) is provided with a flange (233), which is attached to the upper surface of the housing (10) and connected by a locking member.

7. The frequency converter according to any one of claims 2 to 6, characterized in that, Along the height direction of the housing (10), a second channel (13) is provided through the upper surface of the housing (10). The second channel (13) connects the second chamber (231) and the mounting cavity (11), and the external collector (23) covers the second channel.

8. The frequency converter according to any one of claims 1 to 6, characterized in that, The fan component (30) includes an exhaust fan, and the collector component (20) has a clearance hole (21) on the side near the exhaust fan. The clearance hole (21) communicates with the air duct (200), and the exhaust fan is installed in the clearance hole (21); and / or, The fan components (30) include at least three, and the at least three fan components (30) are arranged at intervals along the length direction of the housing (10).

9. The frequency converter according to any one of claims 1 to 6, characterized in that, An air inlet channel (14) is provided on the housing (10), the air inlet channel (14) is connected to the mounting cavity (11), a louver (15) is provided at the entrance of the air inlet channel (14), and a filter is provided on the side of the louver (15) near the mounting cavity (11).

10. The frequency converter according to any one of claims 2 to 6, characterized in that, Along the length of the housing (10), the power unit is arranged close to the inner wall of the housing (10), the transformer unit is arranged at intervals with the power unit, a partition (16) is provided in the mounting cavity (11), the partition (16) and the inner wall of the mounting cavity (11) form a control compartment (17), the control compartment (17) is located on one side of the transformer unit along the width direction of the housing (10), and the control unit is located in the control compartment (17).

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