Single-phase frequency converter and frequency conversion cabinet

Abstract

The utility model discloses a single -phase frequency converter and frequency conversion cabinet, wherein single -phase frequency converter includes: case, radiator, rectifier bridge, inverter module and fan subassembly, and the radiator is installed in the case, and the rectifier bridge and inverter module are installed on the heat exchange surface of radiator, and the heat generated by rectifier bridge and inverter module can be passed through the heat exchange surface and is transferred to radiator. Wherein fan subassembly is connected in the case, and fan subassembly can discharge the heat after the heat exchange of radiator, and wherein by directly installing rectifier bridge and inverter module on radiator, can improve the heat exchange effect, and then discharge the heat after the heat exchange through fan subassembly, can improve the heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power control equipment technology, and in particular to a single-phase frequency converter, and also to a frequency converter cabinet including the above-mentioned single-phase frequency converter. Background Technology

[0002] A frequency converter is an important power control device for controlling AC motors. It mainly consists of a rectifier bridge and an inverter module. It generates a certain amount of heat during operation, which is currently mainly dissipated by air cooling. However, when dealing with high-power frequency converters, conventional air cooling methods are difficult to meet their heat dissipation requirements.

[0003] Therefore, how to improve the heat dissipation effect of frequency converters is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this utility model is to provide a single-phase frequency converter that can effectively improve the heat dissipation effect of the single-phase frequency converter. Another purpose is to provide a frequency converter cabinet including the above-mentioned single-phase frequency converter.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A single-phase frequency converter includes: a chassis, a heat sink, a rectifier bridge, an inverter module, and a fan assembly. The heat sink is installed inside the chassis, the rectifier bridge and the inverter module are installed on the heat exchange surface of the heat sink, and the fan assembly is connected inside the chassis to dissipate the heat after heat exchange by the heat sink.

[0007] In some embodiments, the heat sink is provided with brackets on both sides, and the two brackets are respectively attached to the two sides of the chassis, and the brackets are provided with handles.

[0008] In some embodiments, a heat pipe is provided on the heat exchange surface, and the heat pipe is used to transfer the heat generated by the rectifier bridge and the inverter module to the heat sink.

[0009] In some embodiments, a plurality of rectifier bridges are provided on one side of the heat exchange surface, and a plurality of inverter modules are provided on the other side of the heat exchange surface. The plurality of rectifier bridges are distributed in a horizontal direction, and the plurality of inverter modules are distributed in a horizontal direction. The distribution direction of the rectifier bridges is parallel to the distribution direction of the inverter modules.

[0010] In some embodiments, the fan assembly is located inside the chassis near the rectifier bridge, and the chassis is provided with guide rails, allowing the fan assembly to be movably connected to the chassis.

[0011] In some embodiments, a capacitor bank is provided at one end of the chassis away from the fan assembly, and the capacitor bank is connected to the inverter module.

[0012] In some embodiments, the chassis is provided with a capacitor support frame, and the capacitor bank is disposed on the capacitor support frame.

[0013] In some embodiments, the input busbar, output busbar, first positive busbar, and first negative busbar of the main circuit of the single-phase frequency converter are sequentially arranged on the same side of the chassis.

[0014] In some embodiments, the capacitor bank is provided with a second positive conductor and a second negative conductor for parallel connection with an adjacent single-phase frequency converter, and the second positive conductor and the second negative conductor are both located on the same side of the chassis.

[0015] In some embodiments, two voltage equalizing resistors are provided on the side of the chassis near the capacitor bank, one of which is connected to the second positive electrode busbar and the other is connected to the second negative electrode busbar.

[0016] In some embodiments, the heat sink is provided with a cover plate, and the rectifier bridge and the inverter module are located inside the cover plate.

[0017] In some embodiments, the chassis is provided with a handle on the side.

[0018] In some embodiments, an absorption capacitor is connected in parallel to the positive and negative terminals of the inverter module and the rectifier bridge.

[0019] A frequency converter cabinet includes a single-phase frequency converter as described in any of the above claims, and the frequency converter cabinet also includes a cabinet body, wherein a plurality of the single-phase frequency converters are disposed within the cabinet body.

[0020] Compared with existing technologies, the above technical solution has the following advantages:

[0021] This invention provides a single-phase frequency converter in which the rectifier bridge and inverter module are mounted on the heat exchange surface of a heat sink. The heat generated by the rectifier bridge and inverter module can be transferred to the heat sink through the heat exchange surface. A fan assembly dissipates the heat after heat exchange through the heat sink. By directly mounting the rectifier bridge and inverter module onto the heat sink, the heat exchange effect is improved. Furthermore, the heat dissipation through the fan assembly improves the heat exchange efficiency. Compared to heat dissipation methods that rely solely on a fan assembly, this method effectively improves heat dissipation performance and efficiency, making it particularly suitable for high-power single-phase frequency converters.

[0022] The frequency converter cabinet provided by this utility model has corresponding advantages because it includes the above-mentioned single-phase frequency converter, which will not be elaborated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of a single-phase frequency converter provided in a specific embodiment of this utility model;

[0025] Figure 2 A schematic diagram of the heat sink of a single-phase frequency converter provided for a specific embodiment of this utility model;

[0026] Figure 3 A schematic diagram of the internal structure of a single-phase frequency converter provided for a specific embodiment of this utility model;

[0027] Figure 4 A schematic diagram of the heat sink and chassis of a single-phase frequency converter provided for a specific embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the external structure of a single-phase frequency converter according to a specific embodiment of the present invention.

[0029] The attached figures are labeled as follows:

[0030] 1-Chassis, 2-Heat Radiator, 201-Heat Exchange Surface, 202-Heat Pipe, 203-Heat Heat Dissipation Fins, 3-Conductive Component, 4-Rectifier Bridge, 5-Inverter Module, 6-Capacitor Bank, 7-Voltage Equalizing Resistor, 8-Fan Assembly, 9-Insulating Paper, 10-Cover Plate, 11-Absorbing Capacitor, 12-Bracket, 13-Capacitor Support Frame, 14-Insulating Frame, 15-Capacitor Clamp, 16-Handle, 17-Input Conductor Bus, 18-Output Conductor Bus, 19-First Positive Conductor Bus, 20-First Negative Conductor Bus, 21-Second Positive Conductor Bus, 22-Second Negative Conductor Bus. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please refer to Figures 1 to 5 .

[0033] This utility model provides a single-phase frequency converter, comprising: a chassis 1, a heat sink 2, a rectifier bridge 4, an inverter module 5, and a fan assembly 8, as shown below. Figure 1 As shown, the heat sink 2 is installed inside the chassis 1. The rectifier bridge 4 and inverter module 5 are installed on the heat exchange surface 201 of the heat sink 2, for example, by screws. The heat generated by the rectifier bridge 4 and inverter module 5 can be transferred to the heat dissipation fins of the heat sink 2 through the heat exchange surface 201. The fan assembly 8 is connected inside the chassis 1. The fan assembly 8 dissipates the heat after it has been exchanged by the heat dissipation fins of the heat sink 2. By directly installing the rectifier bridge 4 and inverter module 5 onto the heat sink 2, the heat exchange effect is improved. Furthermore, dissipating the heat through the fan assembly 8 improves the heat exchange efficiency. Compared to a heat dissipation method that only dissipates heat through the fan assembly 8, this method effectively improves the heat dissipation effect and efficiency, and is particularly suitable for high-power single-phase inverters, such as an 800kW single-phase inverter.

[0034] In some embodiments, such as Figure 3 and Figure 4 As shown, to facilitate the installation of the heatsink 2, brackets 12 are provided on both sides of the heatsink 2. The two brackets 12 overlap the two sides of the chassis 1 respectively. The brackets 12 are provided with handles. During installation, the user can use the handles to move the heatsink 2 into the chassis 1, and then overlap the two brackets 12 on the sides of the chassis 1. Specifically, the top of the chassis 1 is open. For example, the chassis 1 includes a bottom plate, a left side plate, and a right side plate. The left side plate and the right side plate are respectively provided with outwardly folded overlapping edges. The brackets 12 include a lower strip plate, a middle strip plate, and an upper strip plate. The upper strip plate and the lower strip plate are arranged parallel to each other. The middle strip plate is perpendicular to the upper strip plate and the lower strip plate. The upper strip plate extends towards the outside of the chassis 1, and the lower strip plate extends towards the inside of the chassis 1. The lower strip plate, the middle strip plate, and the upper strip plate are preferably formed by bending a single piece of sheet metal. The lower strip plate can be connected to the upper surface of the heatsink 2 with screws. The handles are connected to the upper strip plate. The handles can be a rolled edge structure set in the middle of the outer side of the upper strip plate. During installation, first fix the lower strip to the heatsink 2, then lift the heatsink 2 using the handles and place it inside the chassis 1 so that the upper strip overlaps the overlapping plate of the chassis 1. Finally, fix the upper strip and the overlapping plate with screws.

[0035] In some embodiments, such as Figure 2As shown, a heat pipe 202 is provided on the heat exchange surface 201. The heat pipe 202 can be a copper heat pipe 202, which can transfer the heat generated by the rectifier bridge 4 and the inverter module 5 to the heat sink 2. A groove can be provided on the heat exchange surface 201 of the heat sink 2, and the heat pipe 202 is embedded in the groove. Furthermore, in order to improve the heat dissipation effect of the heat sink 2, multiple parallel heat dissipation fins 203 are provided on the side of the heat sink 2 away from the heat exchange surface 201. An airflow channel is formed between adjacent heat dissipation fins 203. When the fan assembly 8 is running, it can draw air out from the airflow channel, thereby improving the heat exchange effect of the heat sink 2.

[0036] In some embodiments, such as Figure 3 As shown, multiple rectifier bridges 4 are provided on one side of the heat exchange surface 201, and multiple inverter modules 5 are provided on the other side of the heat exchange surface 201. The inverter modules 5 can be mounted on the heat sink 2 through the insulating frame 14. By placing the rectifier bridges 4 and the inverter modules 5 on different sides of the heat exchange surface 201, the thermal interference between the two can be reduced. The multiple rectifier bridges 4 are distributed in a horizontal direction, and the multiple inverter modules 5 are distributed in a horizontal direction. The distribution direction of the rectifier bridges 4 is parallel to the distribution direction of the inverter modules 5. The multiple rectifier bridges 4 are connected in parallel through conductive busbars, and the multiple inverter modules 5 are also connected in parallel through conductive busbars.

[0037] In some embodiments, the fan assembly 8 is located inside the chassis 1 near the rectifier bridge 4, that is, the rectifier bridge 4 is located on the heat sink 2 near the air outlet, and the inverter module 5 is located on the heat sink 2 near the air inlet. The chassis 1 is provided with guide rails, and the fan assembly 8 is movably connected to the chassis 1. For example... Figure 1 and Figure 3 As shown, the right side of the chassis 1 has an opening through which the fan assembly 8 can be pushed into the chassis 1 along the guide rail. The fan assembly 8 can then be fixed to the chassis 1 with screws. When disassembly is needed, the screws are removed, and the fan assembly 8 can be pulled out of the chassis 1. Therefore, the drawer-style installation method facilitates the assembly and disassembly of the fan assembly 8, thus simplifying maintenance. The fan assembly 8 includes an axial fan and a fan bracket. The axial fan is mounted on the fan bracket, which has a limiting plate on its outer side. The fan mounting holes on the side of the chassis 1 have connecting holes around them, and the limiting plate also has holes corresponding to these connecting holes to secure the fan bracket to the chassis 1. Furthermore, to facilitate airflow into the fan assembly 8, air guide plates are provided at the top and bottom ends of one side of the heatsink 2.

[0038] In some embodiments, a capacitor bank 6 is provided at the end of the chassis 1 furthest from the fan assembly 8. The capacitor bank 6 includes multiple capacitors, which are connected in series and parallel to form the capacitor bank 6, and then electrically connected to the inverter module 5. Since the inverter module 5 is also located far from the fan assembly 8, the capacitor bank 6 and the inverter module 5 are located on the same side of the chassis 1 to facilitate connection between the capacitor bank 6 and the inverter module 5. Furthermore, an air inlet is provided at the end of the chassis 1 furthest from the fan assembly 8. The fan assembly 8 is used to draw in external air through the air inlet, and the air is discharged after heat exchange through the capacitor bank 6 and the heat sink 2. This air inlet arrangement not only dissipates heat from the heat sink but also from the capacitor bank.

[0039] In some embodiments, a capacitor support frame 13 is provided inside the chassis 1. The capacitor support frame 13 can be fixed inside the chassis 1 to improve the structural strength of the chassis 1. The capacitor group 6 is disposed on the capacitor support frame 13. The capacitor support frame 13 includes a capacitor support plate, a capacitor support beam, and a capacitor clamp 15. The two sides of the capacitor support plate are fixed to the two sides inside the chassis 1. One end of the capacitor support beam is connected to the chassis 1, and the other end is connected to the capacitor support plate. The capacitor support plate is provided with multiple holes, and each capacitor can be disposed in the corresponding hole and fixed to the capacitor support plate by the capacitor clamp 15 to improve the installation stability of the capacitor.

[0040] In some embodiments, to facilitate the combined use of single-phase frequency converters, such as Figure 5 As shown. The input busbar 17, output busbar 18, first positive busbar 19, and first negative busbar 20 of the main circuit of the single-phase frequency converter are sequentially arranged on the same side of the chassis 1. The capacitor bank 6 is provided with a second positive busbar 21 and a second negative busbar 22 for parallel connection with the adjacent single-phase frequency converter. Both the second positive busbar 21 and the second negative busbar 22 are located on the same side of the chassis 1. Each of the input busbar 17, output busbar 18, first positive busbar 19, first negative busbar 20, second positive busbar 21, and second negative busbar 22 has a connection end at one end, and all of them are located outside the chassis 1. Each connection end has a connection hole to facilitate the three-phase combined integrated system cabinet.

[0041] In some embodiments, two voltage equalizing resistors 7 are provided inside the chassis 1 near the capacitor bank 6. The capacitor bank 6 is connected to the positive and negative terminals of the inverter module 5 after being connected in series and parallel through the conductive element 3. One voltage equalizing resistor 7 is connected to the second positive terminal busbar 21, and the other voltage equalizing resistor 7 is connected to the second negative terminal busbar 22. For details of the connection method, please refer to [reference needed]. Figure 1 and Figure 5 As shown, two adjacent conductive bars are separated by insulating paper 9 to ensure electrical safety distance.

[0042] In some embodiments, the heat sink 2 is provided with a cover plate 10, and the rectifier bridge 4 and the inverter module 5 are located inside the cover plate 10. The cover plate 10 can be a transparent PC cover plate, which can protect the devices installed on the heat sink 2.

[0043] In some embodiments, the side of the chassis 1 is provided with a handle 16. For example, a handle 16 can be provided on the left and right sides of the chassis 1 respectively. The handle 16 can be an n-shaped structure to facilitate the user to move the chassis 1.

[0044] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the chassis 1 has a fan housing cavity, and a mounting port is provided on one side of the fan housing cavity. The fan assembly 8 can be connected to the fan housing cavity through this mounting port. In order to facilitate pushing and pulling the fan assembly, a guide rail is provided in the fan housing cavity. The fan assembly 8 is movably connected to the guide rail through the mounting port. By designing the fan assembly as a push-pull type, it is easy to disassemble and assemble.

[0045] In some embodiments, such as Figure 1 As shown, the fan assembly 8 includes an axial fan and a fan bracket. The axial fan is mounted on the fan bracket to form a mounting module, which facilitates disassembly and assembly. A limiting plate is provided on the outer side of the fan bracket. The limiting plate is mainly used to block the fan assembly 8 when it is pushed into the fan housing cavity. The side of the chassis 1 is provided with mounting holes. The limiting plate is provided with connecting holes corresponding to the fan mounting holes. Screws can be inserted into the connecting holes and mounting holes to fix the fan assembly 8.

[0046] In some embodiments, an absorption capacitor 11 is connected in parallel across the positive and negative terminals of the rectifier bridge 4 and the inverter module 5 to absorb the stray inductance on the rectified copper busbar, thereby eliminating the spike voltage of Vce.

[0047] This utility model embodiment also provides a frequency converter cabinet, including the single-phase frequency converter provided in any of the above embodiments. The frequency converter cabinet also includes a cabinet body, and multiple single-phase frequency converters are installed inside the cabinet. For example, three single-phase frequency converters can be installed side by side in a horizontal direction inside the cabinet. The single-phase frequency converters are not limited by phase sequence, have independent main circuit structures, and can be flexibly combined according to the required power. Regarding the beneficial effects of the frequency converter cabinet, please refer to the single-phase converter provided in the above embodiments, which will not be repeated here.

[0048] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0050] The single-phase frequency converter and frequency converter cabinet provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A single-phase frequency converter, characterized in that, include: The chassis (1), heat sink (2), rectifier bridge (4), inverter module (5) and fan assembly (8) are provided. The heat sink (2) is installed inside the chassis (1). The rectifier bridge (4) and the inverter module (5) are installed on the heat exchange surface (201) of the heat sink (2). The fan assembly (8) is connected inside the chassis (1) and is used to dissipate the heat after heat exchange by the heat sink (2).

2. The single-phase frequency converter according to claim 1, characterized in that, The heat sink (2) is provided with brackets (12) on both sides. The two brackets (12) are respectively attached to the two sides of the chassis (1). The brackets (12) are provided with handles.

3. The single-phase frequency converter according to claim 1, characterized in that, The heat exchange surface (201) is provided with a heat pipe (202), which is used to transfer the heat generated by the rectifier bridge (4) and the inverter module (5) to the heat sink (2).

4. The single-phase frequency converter according to claim 1, characterized in that, The rectifier bridge (4) is provided on one side of the heat exchange surface (201) with multiple rectifier bridges (4) and on the other side of the heat exchange surface (201) with multiple inverter modules (5). The multiple rectifier bridges (4) are distributed in the horizontal direction, and the multiple inverter modules (5) are distributed in the horizontal direction. The distribution direction of the rectifier bridges (4) is parallel to the distribution direction of the inverter modules (5).

5. The single-phase frequency converter according to claim 4, characterized in that, The fan assembly (8) is located inside the chassis (1) on one side near the rectifier bridge (4). The chassis (1) is provided with a guide rail, and the fan assembly (8) is movably connected to the chassis (1).

6. The single-phase frequency converter according to claim 1, characterized in that, A capacitor bank (6) is provided at one end of the chassis (1) away from the fan assembly (8), and the capacitor bank (6) is connected to the inverter module (5).

7. The single-phase frequency converter according to claim 6, characterized in that, The chassis (1) is provided with a capacitor support frame (13), and the capacitor group (6) is located on the capacitor support frame (13).

8. The single-phase frequency converter according to claim 1, characterized in that, The input busbar (17), output busbar (18), first positive busbar (19) and first negative busbar (20) of the main circuit of the single-phase frequency converter are sequentially arranged on the same side of the chassis (1).

9. The single-phase frequency converter according to claim 6, characterized in that, The capacitor bank (6) is provided with a second positive conductor (21) and a second negative conductor (22) for parallel connection with the adjacent single-phase frequency converter. The second positive conductor (21) and the second negative conductor (22) are both located on the same side of the chassis (1).

10. The single-phase frequency converter according to claim 9, characterized in that, Two equalizing resistors (7) are provided on one side of the chassis (1) near the capacitor bank (6). One of the equalizing resistors (7) is connected to the second positive electrode busbar (21), and the other equalizing resistor (7) is connected to the second negative electrode busbar (22).

11. The single-phase frequency converter according to claim 1, characterized in that, The radiator (2) is provided with a cover plate (10), and the rectifier bridge (4) and the inverter module (5) are located inside the cover plate (10).

12. The single-phase frequency converter according to claim 1, characterized in that, The side of the chassis (1) is provided with a handle (16).

13. The single-phase frequency converter according to claim 1, characterized in that, An absorption capacitor (11) is connected in parallel to the positive and negative terminals of the inverter module (5) and the rectifier bridge (4).

14. A frequency converter cabinet, characterized in that, The inverter cabinet includes the single-phase inverter as described in any one of claims 1 to 13, and the inverter cabinet further includes a cabinet body, wherein a plurality of the single-phase inverters are disposed within the cabinet body.

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