Power unit for high-voltage frequency converter

Abstract

The utility model discloses a power unit for a high-voltage frequency converter, which comprises a frame, a three-phase rectifier bridge arranged in the frame, a capacitor integrated module, an inversion module, a radiator, a control panel, and a fixed gripper and a fixed plate which are arranged outside the frame, the capacitor integrated module is arranged in the frame and is connected with the frame through a connecting plate, and the inverter module is arranged in the frame. The three-phase rectifier bridge is arranged at the upper end of the capacitor integrated module and used for being connected with three-phase electricity, the inversion module is arranged on one side of the three-phase rectifier bridge and used for outputting two-phase electricity, the three-phase rectifier bridge is connected with the capacitor integrated module through an input stack row, and the inversion module is connected with the capacitor integrated module through an output stack row. The radiator is arranged in the frame so that the space utilization rate can be increased, the fixing tongs and the fixing plates are arranged at the front end and the rear end of the frame respectively, during installation, a user holds a multilateral groove in the fixing tongs and directly pushes the multilateral groove backwards, the first fixing plate and the second fixing plate are inserted into a rear air duct baffle, and the whole process is convenient, fast, firm in fixing and convenient to transport.

Description

Technical Field

[0001] The utility model belongs to the field of frequency conversion equipment, and in particular relates to a power unit for a high-voltage frequency converter. Background Art

[0002] High-voltage inverters are now widely used in high-voltage electrode frequency conversion speed regulation in many fields such as metallurgy, mining, electricity, petrochemicals, cement, water supply and drainage, and central air conditioning, becoming the preferred equipment for enterprises to adopt energy-saving methods for motor systems. High-voltage inverters are generally composed of four parts: a separate transformer cabinet, a power unit cabinet, a control system cabinet, and an input and output cabinet. It occupies a large area, has a complex internal structure, and has many connection points. It needs to use copper bars or wire harnesses to connect the modules, which requires high quality of production and assembly personnel.

[0003] In addition, the power unit in the high-voltage inverter uses large-volume aluminum electrolytic capacitors or film capacitors, which have problems such as low space utilization, high heating temperature, and short service life, and increase production costs. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems that the power unit cabinet of the existing high-voltage inverter adopts large-volume aluminum electrolytic capacitors or film capacitors, which have low space utilization, high heating temperature and short service life, and to provide a power unit for a high-voltage inverter.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A power unit for a high-voltage frequency converter comprises a frame, a three-phase rectifier bridge, a capacitor assembly module, an inverter module, a radiator and a control board; the capacitor assembly module is arranged in the frame and connected to the frame through a connecting plate, the three-phase rectifier bridge is arranged at the upper end of the capacitor assembly module for connecting to three-phase electricity, the inverter module is arranged at one end of the three-phase rectifier bridge for two-phase electricity output, the three-phase rectifier bridge is connected to the capacitor assembly module through an input stack, the inverter module is connected to the capacitor assembly module through an output stack, the radiator is arranged on one side of the inverter module and is located in the frame, and the control board is arranged at the upper end of the radiator.

[0007] Furthermore, it also includes a fixed gripper and a fixed plate; the fixed gripper is arranged on one side of the frame and connected to the frame through a connecting piece; the fixed plate is arranged on the other side of the frame and connected to the frame through a connecting piece.

[0008] Furthermore, the capacitor assembly module includes two capacitor plates and multiple aluminum electrolytic capacitors; the two capacitor plates are connected at both ends by a connecting plate and are internally connected by connecting columns; the multiple aluminum electrolytic capacitors are divided into two groups and installed on the two capacitor plates.

[0009] Furthermore, the input stack includes a first insulating partition, a first positive aluminum bar and a first negative aluminum bar; the first positive aluminum bar and the first negative aluminum bar are arranged on both sides of the first insulating partition, connected to the connecting columns of the capacitor plate through connecting members, and the first negative aluminum bar is arranged on the side close to the aluminum electrolytic capacitor.

[0010] Furthermore, the output stack includes a second insulating partition, a second positive aluminum row and a second negative aluminum row; the second positive aluminum row and the second negative aluminum row are arranged on both sides of the second insulating partition, connected to the connecting columns of the capacitor plate through connecting members, and the second positive aluminum row is arranged on the side close to the aluminum electrolytic capacitor.

[0011] Furthermore, the first positive electrode aluminum bar and the second negative electrode aluminum bar are located on the same horizontal plane; the first negative electrode aluminum bar and the second positive electrode aluminum bar are located on the same horizontal plane.

[0012] Furthermore, the inverter module includes a group of IGBT modules with the same structure; two of the IGBT modules are arranged on the upper end of the second insulating partition.

[0013] Furthermore, the fixed gripper is provided with a through-going polygonal groove.

[0014] Furthermore, the fixing plate includes a first fixing plate and a second fixing plate; the first fixing plate is arranged on the upper end of the second fixing plate, and the second fixing plate and the fixing gripper are on the same horizontal plane.

[0015] Furthermore, the connecting piece is a bolt or a pull rivet.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] The utility model discloses a power unit for a high-voltage frequency converter. The aluminum electrolytic capacitor in the capacitor package module of the device adopts a PCB connection method. The installation structure is compact, the volume of the power unit can be reduced, the service life and the space utilization rate can be improved. During installation, the polygonal groove is held and pushed directly backwards, and the first fixing plate and the second fixing plate are inserted into the rear air duct baffle. The whole process is convenient, fast, firmly fixed and easy to transport. In addition, the capacitor package module, the inverter module and the radiator are installed in the frame and connected by aluminum bars, which simplifies the assembly process steps, improves production efficiency and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a power unit for a high-voltage frequency converter according to the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the capacitor package module in the embodiment of the utility model;

[0020] Figure 3 This is a schematic structural diagram of a power unit for a high-voltage frequency converter according to the utility model from a first viewing angle;

[0021] Figure 4 This is a structural schematic diagram of a power unit for a high-voltage frequency converter according to the utility model from a second viewing angle;

[0022] Figure 5 This is a schematic structural diagram of a power unit for a high-voltage frequency converter according to the utility model from a third viewing angle.

[0023] Reference numerals:

[0024] 1-three-phase rectifier bridge; 2-capacitor assembly module; 21-capacitor plate; 22-aluminum electrolytic capacitor; 3-inverter module; 4-heat sink; 5-control board; 6-input stack; 61-first insulating partition; 62-first positive aluminum row; 63-first negative aluminum row; 7-output stack; 71-second insulating partition; 72-second positive aluminum row; 73-second negative aluminum row; 8-fixed gripper; 81-polygonal groove; 9-fixed plate; 91-first fixed plate; 92-second fixed plate. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] like Figure 1 , 5 As shown, a power unit for a high-voltage inverter includes a frame, a three-phase rectifier bridge 1 arranged in the frame, a capacitor assembly module 2, an inverter module 3, a heat sink 4 and a control board 5, and a fixed gripper 8 and a fixed plate 9 arranged outside the frame; the capacitor assembly module 2 is arranged in the frame and is located at the lower end and connected to the frame through a connecting plate, the three-phase rectifier bridge 1 and the inverter module 3 are arranged at the upper end of the capacitor assembly module 2, and the inverter module 3 is arranged behind the three-phase rectifier bridge 1, the three-phase rectifier bridge 1 is used for connecting to three-phase electricity, the inverter module 3 is used for two-phase electricity output, the heat sink 4 is arranged on one side of the three-phase rectifier bridge 1, and the control board 5 is arranged at the upper end of the radiator 4. Figure 2As shown, the capacitor assembly module 2 includes two capacitor plates 21 and a plurality of aluminum electrolytic capacitors 22. In this embodiment, the number of aluminum electrolytic capacitors 22 is sixty, which are evenly divided into two groups; the two ends of the two capacitor plates 21 are connected to the frame through a connecting plate, and the inside is connected through a plurality of connecting columns. The two groups of aluminum electrolytic capacitors 22 are respectively installed on the two capacitor plates 21, and the inverter module 3 includes a group of IGBT modules with the same structure, which are arranged at one end of the three-phase rectifier bridge 1, and the inverter module 3 and the three-phase rectifier bridge 1 are arranged on the same side. In addition, the three-phase rectifier bridge 1 and the capacitor assembly module 2 are connected through the input stack 6, and the inverter module 3 and the capacitor assembly module 2 are connected through the output stack 7.

[0027] like Figure 4 As shown, it is a schematic diagram of a structure of a power unit for a high-voltage inverter without an assembly surface. The input stack 6 includes a first insulating partition 61, a first positive aluminum row 62 and a first negative aluminum row 63. The first positive aluminum row 62 and the first negative aluminum row 63 are arranged on both sides of the first insulating partition 61, and are respectively connected to the connecting column through a connecting piece. The first negative aluminum row 63 is arranged on the side close to the aluminum electrolytic capacitor 22. In this embodiment, the connecting pieces are bolts or rivets. The output stack 7 includes a second insulating partition 71, a second positive aluminum row 72 and a second negative aluminum row 73. The second positive aluminum row 72 and the second negative aluminum row 73 are arranged on both sides of the second insulating partition 71, and are connected to the second insulating partition 71 through a connecting piece. The second positive aluminum row 72 is arranged on the side close to the aluminum electrolytic capacitor 22. At the same time, the first positive aluminum row 62 and the second negative aluminum row 73 are on the same horizontal plane, and the first negative aluminum row 63 and the second positive aluminum row 72 are on the same horizontal plane. In this embodiment, the connecting posts are the first connecting post, the second connecting post, the third connecting post and the fourth connecting post from front to back, the first positive aluminum bar 62 is connected to the first connecting post, the first negative aluminum bar 63 is connected to the second connecting post, the second negative aluminum bar 73 is connected to the third connecting post, and the second positive aluminum bar 72 is connected to the fourth connecting post. There are two first connecting posts, two second connecting posts, three connecting posts and four connecting posts respectively, which are installed on both sides of the capacitor plate 21.

[0028] like Figure 3 As shown, the fixed gripper 8 is arranged at the front end of the frame, and a through polygonal groove 81 is arranged on the fixed gripper 8, and the fixed plate 9 includes a first fixed plate 91 and a second fixed plate 92, and the first fixed plate 91 and the second fixed plate 92 are both arranged at the rear end of the frame, the first fixed plate 91 is arranged at the upper end of the second fixed plate 92, and the second fixed plate 92 and the fixed gripper 8 are located in the same horizontal plane.

[0029] The working process of a power unit for a high-voltage frequency converter is as follows: a 690-volt three-phase power input is rectified into a direct current by a three-phase rectifier bridge 1. The direct current with a relatively large ripple is filtered into a direct current with a small ripple by a capacitor assembly module. Through a single-phase inverter circuit composed of two IGBT modules, the direct current is converted into two alternating current outputs with controllable frequency under the action of the inverter circuit, and the frequency control is determined by the switching frequency of the IGBT.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A power unit for a high voltage frequency converter, characterized in that: It comprises a frame, a three-phase rectifier bridge (1), a capacitor assembly module (2), an inverter module (3), a heat sink (4) and a control board (5); The capacitor assembly module (2) is arranged in a frame and connected to the frame via a connecting plate; the three-phase rectifier bridge (1) is arranged at the upper end of the capacitor assembly module (2) for connecting to three-phase electricity; the inverter module (3) is arranged at one end of the three-phase rectifier bridge (1) for two-phase electricity output; the three-phase rectifier bridge (1) is connected to the capacitor assembly module (2) via an input stack (6); the inverter module (3) is connected to the capacitor assembly module (2) via an output stack (7); the heat sink (4) is arranged on one side of the inverter module (3) and is located in the frame; the control board (5) is arranged at the upper end of the heat sink (4); and further comprises a fixing gripper (8) and a fixing plate (9); The fixed gripper (8) is arranged on one side of the frame and connected to the frame via a connecting piece; The fixing plate (9) is arranged on the other side of the frame and connected to the frame via a connecting piece.

2. The power unit for a high-voltage frequency converter according to claim 1, characterized in that: The capacitor assembly module (2) comprises two capacitor plates (21) and a plurality of aluminum electrolytic capacitors (22); The two capacitor plates (21) are connected at both ends via a connecting plate and are connected internally via a connecting column. The plurality of aluminum electrolytic capacitors (22) are divided into two groups and are mounted on the two capacitor plates (21).

3. The power unit for a high-voltage frequency converter according to claim 2, characterized in that: The input stack (6) comprises a first insulating separator (61), a first positive electrode aluminum row (62) and a first negative electrode aluminum row (63); The first positive aluminum bar (62) and the first negative aluminum bar (63) are arranged on both sides of the first insulating partition (61), and are connected to the connecting column of the capacitor plate (21) through a connecting piece. The first negative aluminum bar (63) is arranged on a side close to the aluminum electrolytic capacitor (22).

4. The power unit for a high-voltage frequency converter according to claim 3, characterized in that: The output stack (7) comprises a second insulating separator (71), a second positive electrode aluminum row (72) and a second negative electrode aluminum row (73); The second positive aluminum bar (72) and the second negative aluminum bar (73) are arranged on both sides of the second insulating partition (71), and are connected to the connecting columns of the capacitor plate (21) through connecting members. The second positive aluminum bar (72) is arranged on a side close to the aluminum electrolytic capacitor (22).

5. The power unit for a high-voltage frequency converter according to claim 4, characterized in that: The first positive electrode aluminum bar (62) and the second negative electrode aluminum bar (73) are located on the same horizontal plane; The first negative electrode aluminum bar (63) and the second positive electrode aluminum bar (72) are located on the same horizontal plane.

6. The power unit for a high-voltage frequency converter according to claim 5, characterized in that: The inverter module (3) comprises a group of IGBT modules with the same structure; The two IGBT modules are both arranged on the upper end of the second insulating partition (71).

7. The power unit for a high-voltage frequency converter according to claim 6, characterized in that: The fixed gripper (8) is provided with a through-going polygonal groove (81).

8. The power unit for a high-voltage frequency converter according to claim 7, characterized in that: The fixing plate (9) comprises a first fixing plate (91) and a second fixing plate (92); The first fixing plate (91) is arranged on the upper end of the second fixing plate (92), and the second fixing plate (92) and the fixing gripper (8) are on the same horizontal plane.

9. The power unit for a high-voltage frequency converter according to claim 8, characterized in that: The connecting piece is a bolt or a pull rivet.

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