A frequency converter

Abstract

The utility model discloses a frequency converter, including the box, be equipped with the heat dissipation air duct in the box, the box is installed along the air flow direction of heat dissipation air duct's resistance, capacitor, radiator and electric reactor are arranged, install drive board on the radiator, integrate IGBT module on drive board, install the lamination female row of connection with drive board on capacitor, be connected with the alternating current input wiring terminal of the box of IGBT module to stretch out, be connected with the alternating current output wiring terminal of the box of lamination female row to stretch out, direct current output terminal and brake output terminal, be equipped with the positioning groove for placing radiator in the box, be equipped with screw perforated part and mounting strip in the box, be equipped with fastening hole on mounting strip, and the fastener is locked on the radiator through fastening hole, be equipped with the filter structure of the air inlet of heat dissipation air duct on the box, install fan subassembly in the box, can steady installation after the hemming structure of radiator size reduction avoids the opening place of the box, and avoid the condition of producing the shake.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, and in particular to a frequency converter. Background Technology

[0002] As an electrical energy conversion device, the power electronic components inside a frequency converter generate heat during operation. If this heat cannot be dissipated in time, it can affect equipment stability and performance, or even damage the power and electronic components due to overheating. A reasonable heat dissipation design is a key factor in ensuring product quality, performance, and safety. Current frequency converters typically use either air cooling or water cooling for heat dissipation. Air cooling uses a fan to agitate airflow, allowing the air to pass over the radiator fins and carry away heat. Water cooling, on the other hand, uses water channels within the radiator, where cooling water flows through and carries away the heat.

[0003] Water cooling offers better heat dissipation than air cooling, but it requires circulating cooling water, resulting in more additional equipment and a larger overall size. Current air cooling methods use heat sinks to dissipate heat from high-heat-generating components. These heat sinks are placed directly inside the enclosure for fixation. However, the enclosure openings have rolled edges, which can cause scraping when placing the heat sink. Reducing the size of the heat sink makes it difficult to securely fix within the enclosure, posing a risk of movement. Utility Model Content

[0004] (a) Technical issues

[0005] The purpose of this utility model is to provide a frequency converter with a stable installation structure that reduces the size of the heat sink and prevents it from shaking, while having a rolled edge structure at the opening of the housing.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A frequency converter includes a housing with a heat dissipation duct inside. The housing houses a resistor, a capacitor, a heat sink, and a reactor arranged along the airflow direction of the heat dissipation duct. A drive board is mounted on the heat sink, and an IGBT module is integrated on the drive board. A stacked busbar connected to the drive board is mounted on the capacitor. An AC input terminal extending from the housing is connected to the IGBT module. An AC output terminal, a DC output terminal, and a brake output terminal extending from the housing are connected to the stacked busbar. The housing has a positioning slot for placing the heat sink. Screw-through holes are spaced apart on both sides of the positioning slot. Mounting strips are fastened to two screw-through holes on the same side, abutting against the heat sink. Fastening holes are formed on the mounting strips, penetrating the screw-through holes and the side panel of the housing. Fasteners pass through these holes and are locked to the heat sink. A filter structure with an air inlet located in the heat dissipation duct is provided on the housing. A fan assembly is installed between the resistor and the air inlet within the housing.

[0009] Preferably, a sliding guide rail located upstream of the resistor is fixed inside the housing. The sliding guide rail is slidably engaged with the fan assembly. A limiting end plate is provided at the end of the fan assembly. The limiting end plate is connected to the housing by fasteners. A handle is installed on the limiting end plate.

[0010] Preferably, the filter structure includes a plurality of honeycomb holes disposed on the front panel, top panel and side panel of the housing.

[0011] Preferably, the stacked busbar has slots for exposing the wiring screws of the capacitor and the IGBT module, and the wiring screws are copper screws.

[0012] Preferably, a guide vane is installed inside the housing above the reactor, with one end of the guide vane extending obliquely toward the top of the housing.

[0013] Preferably, the AC input terminal, the AC output terminal, the DC output terminal, and the brake output terminal all include copper busbars, one end of which extends out of the housing. An insulating sleeve is installed on the housing and fitted onto the copper busbar. The insulating sleeve has an upwardly extending positioning sleeve, which is fastened to the copper busbar. A strip-shaped hole is opened on the housing to expose the positioning sleeve, and the insulating sleeve is fastened to the strip-shaped hole.

[0014] Preferably, an electrical control box is installed on the enclosure, both the enclosure and the electrical control box are sheet metal structures, and the electrical control box integrates an electrical control module.

[0015] Preferably, the housing is equipped with multiple guide rollers located on one side of the air inlet.

[0016] Preferably, a positioning block located on a sliding guide rail is tightly fitted inside the housing, a positioning plate for positioning the capacitor is provided inside the housing, a connecting plate is tightly fitted between the positioning plate and the positioning block, and a nylon waterproof connector is installed between the connecting plate and the air guide plate.

[0017] Preferably, the rear panel of the housing located at the air outlet of the heat dissipation duct has several honeycomb holes.

[0018] (III) Beneficial Effects

[0019] By setting up heat dissipation ducts inside the enclosure, the resistors, capacitors, radiators and reactors with large heat output are arranged in order of increasing heat output. This makes it easier for the fan assembly to introduce air and expel heat without affecting the heat dissipation effect. The fan assembly delivers air into the heat dissipation ducts to remove internal heat.

[0020] When installing the radiator, the lower part of the radiator is limited by the positioning groove inside the enclosure, and the upper part of the radiator is limited by the installation strip. Fasteners pass through the fastening holes and are locked onto the radiator to achieve a locking effect. This allows for stable installation after the radiator size is reduced to avoid the rolled edge structure at the enclosure opening, and avoids shaking. It also facilitates the protection of the installation status of the IGBT modules and stacked busbars installed on the radiator. Attached Figure Description

[0021] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention;

[0023] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the fan assembly of this utility model in the pulled-out state;

[0025] Figure 5 This is a schematic diagram of the internal structure of the box of this utility model;

[0026] Figure 6 This is a structural schematic diagram of the copper busbar insulation installation state of this utility model;

[0027] exist Figures 1 to 6 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0028] 1. Housing; 2. Heat dissipation duct; 3. Resistor; 4. Capacitor; 5. Heat sink; 6. Reactor; 7. Drive board; 8. Stacked busbar; 9. Air guide plate; 10. Sliding groove; 11. Fan assembly; 12. Sliding guide rail; 13. Limiting end plate; 14. Handle; 15. Honeycomb hole; 16. Slot; 17. Positioning groove; 18. Screw through hole; 19. Mounting strip; 20. Fastening hole; 21. Copper busbar; 22. Insulating sleeve; 23. Positioning sleeve; 24. Strip hole; 25. Electrical control box; 26. Guide roller; 27. Positioning block; 28. Positioning plate; 29. ​​Connecting plate; 30. Nylon waterproof connector. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] See Figures 1-6 As shown, this utility model proposes a frequency converter in its embodiment. The frequency converter is used to convert a 50Hz three-phase AC input to a three-phase AC output with a maximum frequency of 2kHz. By changing the frequency, it achieves speed regulation of the AC motor. In addition, it also outputs DC and braking power for energy release during motor deceleration and braking. The specific circuit function of the frequency converter is existing technology. This embodiment mainly describes and protects the arrangement of internal components and the heat dissipation structure. Specifically, it includes a housing 1, which has a heat dissipation duct 2. The housing 1 is equipped with resistors 3, capacitors 4, heat sinks 5, and reactors 6 arranged along the airflow direction of the heat dissipation duct 2. It can be seen that the main heat-generating electrical components are arranged along the airflow direction of the heat dissipation duct 2 in order of increasing heat generation, so that the front end does not cause excessive temperature rise during heat dissipation. The heat sink 5, as the main heat dissipation component, needs to dissipate heat from the electrical components with larger functions.

[0031] To reliably position the radiator 5 and accommodate the assembly method of placing it from the top of the housing 1 downwards, a positioning groove 17 for placing the radiator 5 is specifically provided inside the housing 1. The radiator 5 is placed into the positioning groove 17 to achieve relative positioning. Simultaneously, screw-through pieces 18 are provided on both sides of the positioning groove 17 and spaced apart. Mounting strips 19 are fastened to the two screw-through pieces 18 on the same side. The mounting strips 19 abut against the radiator 5, securing the radiator 5 without causing it to wobble. Fastening holes 20 are provided on the mounting strips 19, penetrating the screw-through pieces 18 and the side panel of the housing 1. Fasteners pass through the fastening holes 20 and are locked onto the radiator 5. The fasteners through the fastening holes 20 limit and lock the radiator 5, thereby limiting the radiator 5 at both the top and bottom, ensuring the reliability of the radiator 5's installation. With the above structure, the heat sink 5 can be installed stably without shaking even when its width is smaller than that of the housing 1. It also makes it easy to insert the heat sink 5 from above the housing 1, while avoiding interference from the rolled edge structure of the housing 1.

[0032] Meanwhile, a drive board 7 is installed on the heat sink 5, and an IGBT module is integrated on the drive board 7. A stacked busbar 8 connected to the drive board 7 is installed on the capacitor 4. The IGBT module and other components generate a large amount of heat during operation, which is dissipated by the cooling air after heat exchange through the heat sink 5, thus accelerating heat dissipation and preventing heat accumulation. The specific integration of the IGBT module and other modules is based on the function of the frequency converter. This embodiment may not necessarily present all the components required to constitute the frequency converter; it is assumed that relevant components are integrated.

[0033] Since a reactor 6 is installed on one side of the air outlet, which obstructs the air outlet area, an air guide plate 9 is installed inside the housing 1 above the reactor 6. One end of the air guide plate 9 extends obliquely toward the top of the housing 1. After the air guide plate 9 extends obliquely toward the top of the housing 1, it forms a trumpet shape at the air outlet, thereby ensuring the air outlet area, ensuring that the heat dissipation airflow is not obstructed, and maintaining the heat dissipation effect.

[0034] Specifically, the IGBT module is connected to an AC input terminal that extends out of the housing 1, and the stacked busbar 8 is connected to an AC output terminal, a DC output terminal, and a brake output terminal that extend out of the housing 1. By extending each terminal out of the housing 1, it is convenient to perform wiring operations from the outside without interfering with the internal heat dissipation duct 2.

[0035] Specifically, the housing 1 is provided with a filter structure located at the air inlet of the heat dissipation duct 2. A sliding groove 10 is provided on the side of the housing 1, and a fan assembly 11 is slidably installed in the sliding groove 10. The fan assembly 11 is located between the resistor 3 and the air inlet. The sliding groove 10 enables the fan assembly 11 to be disassembled and installed from the outside of the housing 1. Therefore, the fan assembly 11 can be replaced when the heat changes during the operation of the frequency converter, so as to provide greater airflow. This allows the heat dissipation airflow of the fan assembly 11 to increase with the increase of internal heat, further adapting to the large heat changes in the frequency converter, improving the dynamic heat dissipation effect, and ensuring stable heat dissipation of internal components.

[0036] Specifically, in order to facilitate the replacement and assembly of the fan assembly 11, a sliding guide rail 12 located at the upstream end of the resistor 3 is fixed inside the housing 1. The sliding guide rail 12 is slidably engaged with the fan assembly 11, supporting the fan assembly 11 and forming a sliding guide for the fan assembly 11, which facilitates pulling out or pushing in the fan assembly 11, improving the convenience of operation. After the fan assembly 11 is pushed in, it is limited to a predetermined position inside by the sliding guide rail 12, ensuring the cooling air delivered into the cooling duct 2. Meanwhile, a limiting end plate 13 with a size larger than the sliding groove 10 is provided at the end of the fan assembly 11. The limiting end plate 13 is connected to the housing 1 by fasteners. A handle 14 is installed on the limiting end plate 13. After the limiting end plate 13 is positioned at the upper limit of the housing 1, the depth to which the fan assembly 11 is pushed into the sliding groove 10 remains consistent. Furthermore, after the limiting end plate 13 and the housing 1 are locked together by fasteners, there will be no shaking. Specifically, the handle 14 is integrated on the limiting end plate 13 to facilitate the pulling and pushing operation of the fan assembly 11. The fan assembly 11 uses a plug-in connector method. After the fan assembly 11 is changed, it can be directly plugged in. The operation control of the fan assembly 11 is controlled by the control module of the frequency converter.

[0037] To facilitate the filtration of incoming air through the filtration structure and prevent larger impurities from entering the interior, the filtration structure specifically includes several honeycomb holes 15 on the front panel, top panel, and side panel of the housing 1. By opening honeycomb holes 15 on the front panel, top panel, and side panel, the incoming air volume meets the requirements, and the use of honeycomb hole 15 structure will not affect the structural stability of housing 1.

[0038] Specifically, to avoid the risk of poor contact caused by excessive stress when connecting capacitor 4 and IGBT module to the stacked busbar 8, slots 16 are provided on the stacked busbar 8 to expose the wiring screws of capacitor 4 and IGBT module. The wiring screws are copper screws, which improve the reliability of conductive connection, while slots 16 can avoid stress concentration during connection and ensure the reliability of locking connection.

[0039] Specifically, the AC input terminal, the AC output terminal, the DC output terminal, and the brake output terminal all include a copper busbar 21. One end of the copper busbar 21 extends out of the housing 1. An insulating sleeve 22 is mounted on the housing 1 and fitted onto the copper busbar 21. The insulating sleeve 22 has an upwardly extending positioning sleeve 23, which is fastened to the copper busbar 21. The housing 1 has a strip-shaped hole 24 exposing the positioning sleeve 23, and the insulating sleeve 22 is fastened to the strip-shaped hole 24. The insulating sleeve 22 achieves [the desired effect]. The copper busbar 21 is insulated from the housing 1, and the positioning sleeve 23 is locked onto the copper busbar 21. This further limits the overall structure of the insulating sleeve 22 at two positions, thus ensuring stable installation at the slot 24. When the copper busbar 21 passes through the insulating sleeve 22 and presses against the housing 1, it satisfies both positioning and insulation. The positioning sleeve 23 also shields the slot 24, reducing the application of the insulating plate. Furthermore, an independent insulating sleeve 22 can be used depending on the protrusion position of each terminal. The positioning sleeve 23 and the insulating sleeve 22 are integrally formed, with an overall inverted T-shaped structure.

[0040] Specifically, an electrical control box 25 is installed on the housing 1. Both the housing 1 and the electrical control box 25 are sheet metal structures. The electrical control box 25 integrates an electrical control module, which controls the relevant devices. The specific control circuit can use existing technology. By using a sheet metal structure to realize the structure of the housing 1 and the electrical control box 25, the structural stability under load can be met even with a relatively thin wall thickness.

[0041] Specifically, multiple guide rollers 26 are installed on the housing 1 on one side of the air inlet. The guide rollers 26 guide the entire inverter during installation and also enable it to be moved while being transported, thus reducing labor intensity during the handling process.

[0042] Meanwhile, a positioning block 27 located on the sliding guide rail 12 is tightly secured inside the housing 1. A positioning plate 28 for positioning the capacitor 4 is provided inside the housing 1. A connecting plate 29 is tightly secured between the positioning plate 28 and the positioning block 27. A nylon waterproof connector 30 is installed on the connecting plate 29 and the air guide plate 9. The positioning block 27, in cooperation with the sliding guide rail 12, limits the movement of the fan assembly 11. The connecting plate 29 connects the positioning plate 28 and the positioning block 27, further ensuring the continuity of the heat dissipation duct 2. Simultaneously, the positioning plate 28 provides individual positioning for the capacitor 4, ensuring that the capacitor 4 is in a relatively stable installation state. The use of the nylon waterproof connector 30 for wiring prevents airflow from the heat dissipation duct 2 when locked, ensuring airflow within the duct 2 and guaranteeing the heat dissipation effect.

[0043] Specifically, a number of honeycomb holes 15 are provided on the rear panel of the air outlet of the heat dissipation duct 2 on the housing 1. Similarly, the honeycomb holes 15 can block external impurities and facilitate the rapid flow of hot air. The honeycomb holes 15 increase the flow area and improve the air flow speed.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A frequency converter, characterized in that: Includes a housing (1), the housing (1) is provided with a heat dissipation duct (2), the housing (1) is equipped with a resistor (3), a capacitor (4), a heat sink (5) and a reactor (6) arranged along the airflow direction of the heat dissipation duct (2), a drive board (7) is installed on the heat sink (5), an IGBT module is integrated on the drive board (7), and a stacked busbar (8) connected to the drive board (7) is installed on the capacitor (4). The IGBT module is connected to an AC input terminal that extends out of the housing (1), and the stacked busbar (8) is connected to an AC output terminal, a DC output terminal and a brake output terminal that extend out of the housing (1). The housing (1) is provided with a positioning groove (17) for placing the radiator (5). The housing (1) is provided with screw through parts (18) located on both sides of the positioning groove (17) and spaced apart. The two screw through parts (18) on the same side are fitted with mounting strips (19), and the mounting strips (19) abut against the radiator (5). The mounting strip (19) has a fastening hole (20) that passes through the screw hole (18) and the side panel of the housing (1). Fasteners pass through the fastening hole (20) and are locked onto the radiator (5). The housing (1) is provided with a filter structure at the air inlet of the heat dissipation duct (2), and a fan assembly (11) is installed inside the housing (1) between the resistor (3) and the air inlet.

2. The frequency converter according to claim 1, characterized in that: The housing (1) is fixed with a sliding guide rail (12) located at the upstream end of the resistor (3). The sliding guide rail (12) is slidably engaged with the fan assembly (11). The end of the fan assembly (11) is provided with a limiting end plate (13). The limiting end plate (13) is connected to the housing (1) by fasteners. A handle (14) is installed on the limiting end plate (13).

3. A frequency converter according to claim 2, characterized in that: The filter structure includes a number of honeycomb holes (15) on the front panel, top panel and side panel of the housing (1).

4. A frequency converter according to claim 3, characterized in that: The stacked busbar (8) has slots (16) for exposing the wiring screws of the capacitor (4) and the IGBT module, and the wiring screws are copper screws.

5. A frequency converter according to claim 4, characterized in that: The housing (1) is equipped with a guide plate (9) located above the reactor (6), with one end of the guide plate (9) extending obliquely toward the top of the housing (1).

6. A frequency converter according to claim 5, characterized in that: The AC input terminal, the AC output terminal, the DC output terminal, and the brake output terminal all include a copper busbar (21). One end of the copper busbar (21) extends out of the housing (1). An insulating sleeve (22) is installed on the housing (1) and fitted onto the copper busbar (21). An upwardly extending positioning sleeve (23) is provided on the insulating sleeve (22). The positioning sleeve (23) is fastened to the copper busbar (21). A strip hole (24) is opened on the housing (1) to expose the positioning sleeve (23). The insulating sleeve (22) is fastened to the strip hole (24).

7. A frequency converter according to claim 6, characterized in that: An electrical control box (25) is installed on the box (1). Both the box (1) and the electrical control box (25) are sheet metal structures. An electrical control module is integrated inside the electrical control box (25).

8. A frequency converter according to claim 7, characterized in that: The housing (1) is equipped with multiple guide rollers (26) located on one side of the air inlet.

9. A frequency converter according to claim 8, characterized in that: The housing (1) has a positioning block (27) located on the sliding guide rail (12) inside. The housing (1) has a positioning plate (28) for positioning the capacitor (4) inside. A connecting plate (29) is tightly connected between the positioning plate (28) and the positioning block (27). A nylon waterproof connector (30) is installed on the connecting plate (29) and the air guide plate (9).

10. A frequency converter according to claim 9, characterized in that: Several honeycomb holes (15) are provided on the rear panel of the housing (1) located at the air outlet of the heat dissipation duct (2).

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