Frequency converter power unit layout structure

Abstract

The utility model relates to the field of frequency converters, in particular to a frequency converter power unit layout structure. The device comprises a cabinet, an inversion side power unit assembly, a rectification side power unit assembly, a DC capacitor and a fan assembly. A plurality of cross beams are arranged on the cabinet, a plurality of first cabinet alternating current copper bars extending upwards are arranged side by side, a plurality of second cabinet alternating current copper bars extending downwards are arranged side by side, and a plurality of guide rail beams are arranged on the cross beams side by side; each of the inversion side power unit assembly and the rectification side power unit assembly comprises a plurality of power units which are distributed side by side; each power unit comprises a power unit main body arranged on the guide rail beam, and a positive and negative laminated busbar and an alternating current output bar which are arranged on the power unit main body; and a direct-current capacitor busbar connected with the positive and negative laminated busbars is arranged on the direct-current capacitor. The rectification side power unit and the inversion side power unit are the same in structure and can be universal, and the power units and the direct current capacitors are separated and are convenient to maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of frequency converter, in particular to a kind of frequency converter power unit layout structure. BACKGROUND

[0002] In frequency converter, power unit mainly plays the role of power conversion.The input of frequency converter is usually fixed frequency and fixed voltage AC, such as common three-phase AC power supply, and its frequency is generally 50Hz or 60Hz.Power unit can convert this fixed frequency and voltage AC input into variable frequency and variable voltage AC output to drive motor.Power unit can effectively regulate the transmission and distribution of electric energy.It can control the size of output power according to control signal to realize accurate supply of energy required by motor load.Power unit is the main device in frequency converter, but also the device that is easily damaged, and needs to be maintained frequently.

[0003] In prior art, power unit of frequency converter has the following shortcomings:

[0004] 1.Power unit is divided into rectification side and inverter side, and the structure of two kinds of power units is not the same, and cannot be universal.

[0005] 2.Power unit is assembled with DC capacitor, so that the volume of power unit is too large, and maintenance is inconvenient. CONTENT OF UTILITY MODEL

[0006] The utility model aims at the problems in the background art, and proposes a kind of frequency converter power unit layout structure, and rectification side power unit and inverter side power unit structure are the same, can realize universal, and power unit and DC capacitor are separated, and maintenance is facilitated.

[0007] The utility model discloses a technical scheme, a kind of frequency converter power unit layout structure, including cabinet, inverter side power unit assembly, rectification side power unit assembly, DC capacitor and fan assembly;Multiple crossbeams are provided on cabinet, and multiple upwardly extending first cabinet AC copper bars are provided in parallel, multiple downwardly extending second cabinet AC copper bars are provided in parallel, multiple guide rail beams are provided in parallel on crossbeam;Inverter side power unit assembly and rectification side power unit assembly are distributed in staggered positions, and inverter side power unit assembly and rectification side power unit assembly all include multiple power units distributed in parallel, and power unit is correspondingly installed on guide rail beam, and power unit includes the power unit main body arranged on guide rail beam and positive and negative laminated busbar and AC output row arranged on power unit main body, the AC output row of power unit in rectification side power unit assembly is connected with first cabinet AC copper bar, and the AC output row of power unit in inverter side power unit assembly is connected with second cabinet AC copper bar;DC capacitor is arranged on cabinet, and DC capacitor is provided with DC capacitor busbar connected with positive and negative laminated busbar;Fan assembly is provided with multiple groups, and fan assembly is correspondingly installed on guide rail beam, and fan assembly is towards power unit.

[0008] Preferably, the cabinet is provided with a limiting plate for limiting the top end position of each power unit.

[0009] Preferably, the cabinet is provided with two wire grooves, and the two wire grooves are respectively located below the front side of the inverter side power unit assembly and the rectification side power unit assembly.

[0010] Preferably, the multiple power units in the inverter side power unit assembly and the multiple power units in the rectification side power unit assembly are distributed in staggered positions.

[0011] Preferably, the power unit main body has an upper guide rail portion at the top and a lower guide rail portion at the bottom, and the upper guide rail portion or the lower guide rail portion can be connected with the guide rail beam.

[0012] Preferably, the power unit has a water inlet and a water outlet.

[0013] Preferably, the fan assembly includes a fan seat connected with the guide rail beam and multiple fans arranged in parallel on the fan seat, the fan seat has air inlets corresponding to the fans, the guide rail beam has a mounting space for the fans to extend into, and the top of the guide rail beam has a ventilation opening.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] In the utility model, the rectification side power unit and the inverter side power unit have the same structure and both include multiple power units distributed in parallel, so that the power units can be universal. The power units and the DC capacitor are separated, which facilitates maintenance. The fan assembly is also separated from the power units, and the fan assembly can be individually disassembled for maintenance without the need to disassemble the power units. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structural perspective view of the embodiment of the utility model;

[0017] Figure 2 The structural front view of Figure 1 ;

[0018] Figure 3 The structural side view of Figure 1 ;

[0019] Figure 4 The structural rear view of Figure 1 ;

[0020] Figure 5 The structural perspective view of one view angle of the power unit;

[0021] Figure 6 The structural perspective view of another view angle of the power unit;

[0022] Figure 7 The distribution schematic view of the fan;

[0023] Figure 8 The structural explosion view of the power unit main body, the fan seat and the fan.

[0024] The drawing mark: 1, the cabinet; 101, the first cabinet alternating current copper bar; 102, the second cabinet alternating current copper bar; 103, the limiting plate; 2, the crossbeam; 3, the wire slot; 4, the guide rail beam; 5, the power unit; 51, the power unit main body; 511, the upper guide rail part; 512, the lower guide rail part; 52, the positive and negative laminated busbar; 53, the alternating current output bar; 54, the water inlet; 55, the water outlet; 6, the fan seat; 7, the fan; 8, the direct current capacitor; 9, the direct current capacitor busbar. DETAILED DESCRIPTION

[0025] As shown in Figures 1-8 , the power unit layout structure of the frequency converter proposed in the embodiment includes a cabinet 1, an inverter side power unit assembly, a rectifier side power unit assembly, a direct current capacitor 8 and a fan assembly.

[0026] As shown in Figure 2 , a plurality of first cabinet alternating current copper bars 101 extending upwards are arranged side by side on the cabinet 1, and a plurality of second cabinet alternating current copper bars 102 extending downwards are arranged side by side. Two rows of wire slots 3 are arranged on the cabinet 1, and the two rows of wire slots 3 are respectively located below the front side of the inverter side power unit assembly and the rectifier side power unit assembly. The wire slot 3 can store the control cable, temperature acquisition cable and fan cable of the power unit 5 and the like.

[0027] As shown in Figure 1 , a plurality of crossbeams 2 are arranged on the cabinet 1, and a plurality of guide rail beams 4 are arranged side by side on the crossbeams 2.

[0028] like Figures 1-3 As shown, both the inverter-side power unit assembly and the rectifier-side power unit assembly include multiple power units 5 arranged side-by-side. The inverter-side and rectifier-side power unit assemblies are staggered vertically, with the inverter-side power unit assembly on the upper layer and the rectifier-side power unit assembly on the lower layer. Specifically, the multiple power units 5 in the inverter-side and rectifier-side power unit assemblies are staggered to avoid interfering with the heat dissipation of the power units 5 on the upper and lower layers. The power units 5 are mounted on the guide rail beam 4 and connected by screws. A limiting plate 103 is provided on the cabinet 1 to limit the top position of each power unit 5, preventing the power units 5 from shaking after installation.

[0029] The power unit 5 includes a power unit body 51 mounted on the guide beam 4, and positive and negative stacked busbars 52 and AC output busbars 53 mounted on the power unit body 51. The power unit 5 has a water inlet 54 and a water outlet 55, which can be connected to external water pipes for heat dissipation. The AC output busbar 53 of the power unit 5 in the rectifier-side power unit assembly is connected to the upward-extending first cabinet AC copper busbar 101, and the AC output busbar 53 of the power unit 5 in the inverter-side power unit assembly is connected to the downward-extending second cabinet AC copper busbar 102.

[0030] The power unit body 51 has an upper guide rail 511 at the top and a lower guide rail 512 at the bottom, which can be connected to the guide rail beam 4. When installing the power unit 5, it can be installed on the guide rail beam 4 through the upper guide rail 511 or the lower guide rail 512 according to actual needs, that is, it can be rotated 180° for inverted installation in both directions.

[0031] DC capacitors 8 are mounted on cabinet 1, and each DC capacitor 8 has a DC capacitor busbar 9 connected to the positive and negative stacked busbars 52. One DC capacitor busbar 9 can be connected to the positive and negative stacked busbars 52 of multiple power units 5. The DC capacitors 8 are distributed around and in the middle of the positive and negative stacked busbars 52 of the power units 5, as close to the positive and negative stacked busbars 52 as possible. This prevents individual capacitors from overheating and being damaged due to large differences in distance between the capacitors and the power units. Moreover, by concentrating the capacitors, the impact of the failure of a single capacitor on the entire circuit is smaller, thus extending the service life of the entire frequency converter.

[0032] like Figure 2 , Figure 7 and Figure 8As shown, the fan assemblies are provided in multiple groups, and the fan assemblies are installed on the guide rail beam 4 one by one, and the fan assemblies are towards the power unit 5, and each group of fan assemblies ventilates and dissipates heat for one power unit 5. The fan assembly comprises a fan seat 6 connected with the guide rail beam 4 and a plurality of fans 7 arranged side by side on the fan seat 6, and the fan seat 6 is connected with the guide rail beam 4 by bolts. The fan seat 6 has an air port corresponding to the fan 7, the guide rail beam 4 has a mounting space for the fan 7 to extend into, and the top of the guide rail beam 4 has an air vent. The fan 7 can extend into the inside of the mounting space of the guide rail beam 4 with the fan seat 6, and the fan 7 draws air from the air port of the fan seat 6 and blows the air to the power unit 5 through the air vent of the guide rail beam 4 for heat dissipation. Because the power units 5 of the upper and lower two layers are distributed in a staggered manner, a channel is left for the fan 7 to blow and dissipate heat, which is beneficial to the heat dissipation of the power unit 5. The fan assembly and the power unit 5 are separately provided, and when the fan assembly is maintained, the fan seat 6 is disassembled, and then the fan seat 6 and the fan 7 are taken out, without the need to disassemble the power unit 5.

[0033] In the embodiment, the rectifier side power unit and the inverter side power unit have the same structure, and both comprise a plurality of power units 5 arranged side by side, and the power units 5 can be universal. The DC capacitor busbar 9 is connected with the positive and negative laminated busbars 52 of the plurality of power units 5 at the same time, the power unit 5 and the DC capacitor 8 are separated, and the maintenance is facilitated. The fan assembly is also separated from the power unit 5, and the fan assembly can be disassembled alone for maintenance, without the need to disassemble the power unit 5. In addition, the power unit 5 can be cooled and dissipated by air cooling and water cooling at the same time.

[0034] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. A variable frequency drive power cell layout structure, comprising: The utility model relates to a cabinet (1) which is provided with a plurality of cross beams (2), a plurality of first cabinet AC copper bars (101) extending upward are arranged side by side, a plurality of second cabinet AC copper bars (102) extending downward are arranged side by side, a plurality of guide rail beams (4) are arranged side by side on the cross beams (2). The inverter side power unit assembly and the rectifier side power unit assembly are distributed in an up-down staggered manner, and each of the inverter side power unit assembly and the rectifier side power unit assembly includes a plurality of power units (5) arranged side by side, the power units (5) are installed on the guide rail beams (4) correspondingly, the power unit (5) includes a power unit body (51) arranged on the guide rail beam (4), and a positive-negative laminated busbar (52) and an AC output bar (53) arranged on the power unit body (51), the AC output bar (53) of the power unit (5) in the rectifier side power unit assembly is connected with the first cabinet AC copper bar (101), and the AC output bar (53) of the power unit (5) in the inverter side power unit assembly is connected with the second cabinet AC copper bar (102). A DC capacitor (8) is arranged on the cabinet (1), and a DC capacitor busbar (9) connected with the positive-negative laminated busbar (52) is arranged on the DC capacitor (8). A plurality of fan assemblies are arranged correspondingly on the guide rail beams (4) and face the power units (5). A limiting plate (103) for limiting the top end position of each power unit (5) is arranged on the cabinet (1).

2. The layout structure of a power unit of a frequency converter according to claim 1, characterized in that, Two rows of wire grooves (3) are arranged on the cabinet (1), and the two rows of wire grooves (3) are arranged below the front side of the inverter side power unit assembly and the rectifier side power unit assembly respectively.

3. The layout structure of a frequency converter power cell according to claim 1, characterized in that, The plurality of power units (5) in the inverter side power unit assembly and the plurality of power units (5) in the rectifier side power unit assembly are distributed in a staggered manner.

4. The power cell layout of a frequency converter according to claim 1, characterized in that, The power unit body (51) has an upper guide rail part (511) at the top and a lower guide rail part (512) at the bottom, and the upper guide rail part (511) or the lower guide rail part (512) can be connected with the guide rail beam (4).

5. The power cell layout of a frequency converter according to claim 1, characterized in that, The power unit (5) has a water inlet (54) and a water outlet (55).

6. The layout of a power cell of a frequency converter according to claim 1, characterized in that, The fan assembly includes a fan seat (6) connected with the guide rail beam (4) and a plurality of fans (7) arranged side by side on the fan seat (6), the fan seat (6) has a fan opening corresponding to the fan (7), the guide rail beam (4) has a mounting space for the fan (7) to extend into, and the top of the guide rail beam (4) has a ventilation opening.

7. The layout of a power cell of a frequency converter according to claim 1, characterized in that, ​

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