Structure for reducing height of power unit of frequency converter

Abstract

The utility model provides a structure for reducing the height of a frequency converter power unit, and relates to the technical field of frequency converters. The structure for reducing the height of the power unit of the frequency converter comprises a U-shaped shell, an opening of the U-shaped shell is arranged upwards, a plurality of threaded holes which are uniformly distributed up and down are formed in the side face of the U-shaped shell, a cover plate is arranged at the opening of the U-shaped shell, and the cover plate is connected with the U-shaped shell through a fastening bolt; the mounting plate is connected into the U-shaped shell, a plurality of through holes are formed in the mounting plate, capacitors are inserted into the through holes, one ends of the capacitors are tightly attached to the shell wall of the U-shaped shell, the other ends of the capacitors are connected with capacitor leading-out terminals, and the capacitor leading-out terminals penetrate through avoiding openings formed in the cover plate; the outer surface of the capacitor is provided with a clamp, the outer surface of the clamp is connected with a plurality of side lugs, and the side lugs are connected with the mounting plate. The structure for reducing the height of the power unit of the frequency converter provided by the utility model has the advantages of good integration performance and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a structure for reducing the height of a power unit of a frequency converter. Background Art

[0002] With the rapid development of power electronic information technology, computer technology and automatic control technology, the rapid development of electrical transmission technology has been promoted. As an important product of transmission technology, frequency converters are widely used in electric energy, municipal water supply, thermal power generation, mining production and other industries. As the core component of the frequency converter, the design of the power unit itself directly affects the energy efficiency, structure, size, etc. of the frequency converter, and plays a vital role in the stable operation of the frequency converter. There are often several power units in a frequency converter. If the height of the power unit can be reduced, the width of the frequency converter can be significantly reduced.

[0003] Common devices inside the power unit generally include IGBT, rectifier diodes, capacitors, laminated busbars, etc. The capacitor is fixed to the casing through the studs on the bottom, and the lead terminals on the top of the capacitor are fixed to the laminated busbar. The upper part of the laminated busbar is the cover of the power unit. In order to meet safety requirements, a certain distance must be reserved between the laminated busbar and the cover, which leads to an increase in the height of the whole machine, which in turn affects the integration performance of the inverter and increases costs.

[0004] Therefore, it is necessary to provide a new structure for reducing the height of the inverter power unit to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a structure for reducing the height of a power unit of a frequency converter with good integration performance and low cost.

[0006] The structure for reducing the height of the inverter power unit provided by the utility model comprises: a U-shaped shell, the opening of the U-shaped shell is arranged upward, and the side of the U-shaped shell is provided with a plurality of threaded holes evenly distributed up and down, and the opening of the U-shaped shell is connected with a cover plate;

[0007] A mounting plate is connected in the U-shaped shell, and the mounting plate is provided with a plurality of through holes, capacitors are inserted in the through holes, one end of the capacitor is closely attached to the shell wall of the U-shaped shell, the other end of the capacitor is connected to the capacitor lead-out terminal, and the capacitor lead-out terminal is arranged through the avoidance opening provided in the cover plate; a clamp is installed on the outer surface of the capacitor, a plurality of side ears are connected to the outer surface of the clamp, and the side ears are connected to the mounting plate.

[0008] Preferably, the cover plate is connected to the U-shaped shell by fastening bolts.

[0009] Preferably, the plurality of side ears are integrally formed with the clamp.

[0010] Preferably, a gasket for increasing friction is fixedly connected to the inner wall of the clamp.

[0011] Preferably, the gasket is a silicone pad, and the thickness of the silicone pad is controlled at 1-1.5 mm.

[0012] Preferably, the cover plate is integrally formed with a top plate, the top plate is aligned with the capacitor, and the top plate and the cover plate form a laminated busbar; an insulating plate is connected to the edge of the lower surface of the cover plate, and the cover plate is connected to the U-shaped shell through the insulating plate.

[0013] Preferably, a circuit board is installed on the outer surface of the U-shaped shell, and two opposite outer side surfaces of the U-shaped shell are rotatably connected with handles.

[0014] Compared with the related art, the structure for reducing the height of the inverter power unit provided by the utility model has the following beneficial effects:

[0015] The capacitor in the utility model is connected to the mounting plate through a clamp, and does not need to be fixed by a bottom screw. Since the bottom of the capacitor is a plane, the gap between the bottom of the capacitor and the wall of the U-shaped shell can be reduced, the height can be reduced, and the height of the power unit can be significantly reduced, thereby reducing the width of the inverter, improving the integration performance of the inverter, and reducing costs.

[0016] The utility model uses a laminated busbar as the outer cover of the power unit instead of the original metal cover, and the laminated busbar is insulated from the cover by an insulating plate, so that the original reserved safety gap between the top metal cover and the laminated busbar and the thickness of the external end cover can be saved, the height can be reduced, the integrated performance of the inverter is further improved, and the cost is reduced; the laminated busbar also serves as a unit air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of a preferred embodiment of a structure for reducing the height of a power unit of a frequency converter provided by the utility model;

[0018] Figure 2 for Figure 1 A partial structural diagram of a structure for reducing the height of a power unit of a frequency converter is shown;

[0019] Figure 3 for Figure 1 The schematic diagram of the structure of the tooling for connecting the clamp to the capacitor in the structure for reducing the height of the inverter power unit is shown.

[0020] Numbers in the figure: 1, top plate; 2, circuit board; 3, cover plate; 4, shell; 5, capacitor; 6, insulating plate; 7, clamp; 8, side ear; 9, capacitor lead terminal; 10, mounting plate; 11, tooling assembly 11; 111, connecting rod; 112, top plate; 113, groove; 114, bottom plate; 115, waist-shaped hole. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0022] Please refer to Figures 1 to 3 A structure for reducing the height of a power unit of an inverter comprises: a U-shaped U-shaped shell 4, the opening of the U-shaped U-shaped shell 4 is arranged upward, and a plurality of threaded holes evenly distributed up and down are opened on the side of the U-shaped U-shaped shell 4, a cover plate 3 is arranged at the opening of the U-shaped U-shaped shell 4, and the cover plate 3 is connected to the U-shaped U-shaped shell 4 by fastening bolts; a mounting plate 10, the mounting plate 10 is connected in the U-shaped U-shaped shell 4, and the mounting plate 10 is provided with a plurality of through holes, a capacitor 5 is inserted in the through hole, one end of the capacitor 5 is close to the shell wall of the U-shaped U-shaped shell 4, and the other end of the capacitor 5 is connected to a capacitor lead-out terminal 9, and the capacitor lead-out terminal 9 is arranged through the avoidance opening opened in the cover plate 3; a clamp 7 is installed on the outer surface of the capacitor 5, and a plurality of side ears 8 are connected to the outer surface of the clamp 7, and the side ears 8 are connected to the mounting plate 10.

[0023] It should be noted that the U-shaped shell 4 and the cover plate 3 constitute the box body of the power unit; the capacitor 5 is connected to the mounting plate 10 through the clamp 7, and there is no need to fix the capacitor 5 through the bottom screw. Since the bottom of the capacitor 5 is a plane, the gap between the bottom of the capacitor 5 and the shell wall of the U-shaped shell 4 can be reduced, and the height can be reduced by about 15-20mm, which can significantly reduce the height of the power unit, thereby reducing the width of the inverter, improving the integration performance of the inverter, and reducing costs.

[0024] refer to Figure 2 As shown, the plurality of side ears 8 are integrally formed with the clamp 7 .

[0025] It should be noted that the integral molding of the side ear 8 and the clamp 7 can increase the strength of the connection between the side ear 8 and the clamp 7, thereby increasing the stability and reliability of the device.

[0026] refer to Figure 2 As shown, a gasket for increasing friction is fixedly connected to the inner wall of the clamp 7; the gasket is a silicone pad, and the thickness of the silicone pad is controlled at 1-1.5 mm.

[0027] It should be noted that the silicone pad can increase the friction between the clamp 7 and the capacitor 5, thereby ensuring the stability of the connection between the capacitor 5 and the clamp 7.

[0028] refer to Figure 1 As shown, the cover plate 3 is integrally formed with the top plate 1, the top plate 1 is aligned with the capacitor 5, and the top plate 1 and the cover plate 3 form a laminated busbar; an insulating plate 6 is connected to the edge of the lower surface of the cover plate 3, and the cover plate 3 is connected to the U-shaped shell 4 through the insulating plate 6.

[0029] It should be noted that the laminated busbar is used as the outer cover of the power unit instead of the original metal cover, and the laminated busbar is insulated from the cover 3 by the insulating plate 6, so that the original reserved safety gap between the top metal cover and the laminated busbar and the thickness of the external end cover can be saved, and the height can be reduced by about 15-20mm; the laminated busbar also serves as the unit air duct, and the laminated busbar and the unit casing together form a sealed structure.

[0030] refer to Figure 1 As shown, a circuit board 2 is mounted on the outer surface of the U-shaped housing 4, and two opposite outer side surfaces of the U-shaped housing 4 are rotatably connected with handles.

[0031] Note: The handle facilitates taking the entire power unit.

[0032] refer to Figure 3 As shown, when the clamp 7 is connected to the capacitor 5, it is positioned by the tooling assembly 11, and the tooling assembly 11 includes a connecting rod 111, a top plate 112, a groove 113, a bottom plate 114, and a waist-shaped hole 115. The bottom plate 114 is provided with a waist-shaped hole 115, and the upper surface of the bottom plate 114 is connected to the top plate 112 through the connecting rod 111. The top plate 112 is provided with an opening, and the upper surface of the top plate 112 is provided with a plurality of grooves 113 interconnected with the opening.

[0033] When installing the clamp 7, first put in the capacitor 5, and make the positive and negative poles of the capacitor 5 consistent with the markings on the tooling. Since the waist-shaped hole 115 in the tooling limits the capacitor lead-out terminal 9, the capacitor 5 installed in the tooling can remain consistent; secondly, put the clamp 7 on the capacitor 5, and make the side ears 8 of the clamp 7 enter the corresponding groove 113, and the connecting piece of the clamp 7 and the bolt group on the connecting piece are at the notch position of the tooling. Since the position of the groove 113 is fixed, the relative position of the three side ears 8 of the clamp 7 and the capacitor lead-out terminal 9 is also fixed; finally, clamp the nut on the clamp 7 so that the clamp 7 completely holds the capacitor 5. At this time, the capacitor 5 and the clamp 7 have been fixed and can be taken out of the tooling.

[0034] At the same time, the distance between the mounting surface of the side ear 8 and the end surface of the capacitor lead terminal 9 can be adjusted by adjusting the length of the tooling room connecting rod 111 according to product requirements, thereby improving the flexibility of the device.

[0035] The working principle of the structure for reducing the height of the inverter power unit provided by the utility model is as follows:

[0036] The capacitor 5 in the utility model is connected to the mounting plate 10 through the clamp 7, and the capacitor 5 does not need to be fixed by the bottom screw. Since the bottom of the capacitor 5 is a plane, the gap between the bottom of the capacitor 5 and the shell wall of the U-shaped U-shaped shell 4 can be reduced, and the height can be reduced by about 15-20mm, thereby significantly reducing the height of the power unit, thereby reducing the width of the inverter, improving the integration performance of the inverter, and reducing the cost;

[0037] The utility model uses a laminated busbar as the outer cover of the power unit instead of the original metal cover, and the laminated busbar is insulated from the cover 3 by the insulating plate 6, so that the original reserved safety gap between the top metal cover and the laminated busbar and the thickness of the external end cover can be saved, and the height can be reduced by about 15-20mm; the laminated busbar also serves as a unit air duct, and the laminated busbar and the unit shell together form a sealed structure.

[0038] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A structure for reducing the height of a frequency converter power unit, characterized in that: include: A U-shaped shell (4), the opening of the U-shaped shell (4) being arranged upwards, and a plurality of threaded holes evenly distributed vertically are provided on the side surface of the U-shaped shell (4), and a cover plate (3) is connected to the opening of the U-shaped shell (4); A mounting plate (10) is connected to the U-shaped housing (4), and the mounting plate (10) is provided with a plurality of through holes, in which capacitors (5) are inserted, one end of the capacitor (5) is in close contact with the housing wall of the U-shaped housing (4), and the other end of the capacitor (5) is connected to a capacitor lead terminal (9), and the capacitor lead terminal (9) is arranged to pass through a relief opening provided in the cover plate (3); a clamp (7) is installed on the outer surface of the capacitor (5), and a plurality of side ears (8) are connected to the outer surface of the clamp (7), and the side ears (8) are connected to the mounting plate (10).

2. The structure for reducing the height of the inverter power unit according to claim 1, characterized in that: The cover plate (3) is connected to the U-shaped housing (4) via fastening bolts.

3. The structure for reducing the height of the inverter power unit according to claim 1, characterized in that: The plurality of side ears (8) are integrally formed with the clamp (7).

4. The structure for reducing the height of the inverter power unit according to claim 3, characterized in that: A gasket for increasing friction is fixedly connected to the inner wall of the clamp (7).

5. The structure for reducing the height of the inverter power unit according to claim 4, characterized in that: The gasket is a silicone pad, and the thickness of the silicone pad is controlled at 1-1.5 mm.

6. The structure for reducing the height of the inverter power unit according to claim 5, characterized in that: The cover plate (3) is integrally formed with a top plate (1), the top plate (1) and the capacitor (5) are arranged in alignment, and the top plate (1) and the cover plate (3) form a laminated busbar; an insulating plate (6) is connected to the edge of the lower surface of the cover plate (3), and the cover plate (3) is connected to the U-shaped shell (4) via the insulating plate (6).

7. The structure for reducing the height of the inverter power unit according to any one of claims 1 to 6, characterized in that: A circuit board (2) is mounted on the outer surface of the U-shaped shell (4), and two opposite outer side surfaces of the U-shaped shell (4) are rotatably connected to handles.

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