Two-phase flow frequency converter

Abstract

A two-phase flow frequency converter relates to the technical field of power control equipment and comprises a structural shell, a fan and a machine core assembly, the fan is fixedly arranged at the top or the bottom of the structural shell, the machine core assembly is arranged in the structural shell and comprises a first I-GBT module and a condensation plate, and the condensation plate is arranged in the structural shell. The first IGBT module is connected with a condensation plate through an evaporation pipe and a condensation pipe, and the condensation plate is fixedly arranged in the structural shell. Compared with a traditional frequency converter, the layout breaks through the physical limit of a traditional insertion piece or relieved tooth radiator, so that the power unit is more compact in structure and smaller in size, the power density is improved, and the heat dissipation effect is better. No space is occupied during installation, and cabinet assembling is facilitated. And the length of the used conducting bar is reduced to the maximum. Therefore, the structure cost is reduced to the minimum. Strong current and weak current are separated and do not interfere with each other, and the PCB is arranged on the top plate, so that the strong electromagnetic field of the conducting bar is prevented from interfering a PCB weak current circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power control equipment, in particular to a two-phase flow frequency converter. Background Art

[0002] With the rapid expansion of the domestic inverter market, traditional 380V and 690V voltage level inverters have gradually become unable to meet the increasingly diverse needs of customers and enterprises. Although these inverters meet basic functions to a certain extent, with the development of the industry and the advancement of technology, they have some shortcomings that need to be further addressed.

[0003] First, the commonly used frequency converters have certain limitations in terms of power density, cost and performance. As enterprises continue to improve the performance of equipment, the power density of traditional frequency converters is low and it is difficult to meet high power requirements. At the same time, with the continuous increase in raw material and labor costs, the manufacturing cost of traditional frequency converters is relatively high, which affects their market competitiveness. In addition, although the frequency converter performs well in basic functions, under some special working conditions, such as high temperature environment or high-frequency vibration, the performance may be unstable or insufficient.

[0004] Secondly, the design of conventional inverters has certain limitations. For example, traditional inverters usually adopt a design where one IGBT corresponds to one gate-level driver board. As the power increases, the number of IGBT modules required increases, resulting in a complex system structure and increased failure rate. At the same time, as the rated current of a single IGBT module gradually increases, the corresponding heat dissipation requirements also increase, which may lead to heat dissipation problems and an increase in system volume, thus affecting the overall performance and cost of the equipment.

[0005] Therefore, in response to the above problems, the future development direction should be to develop more efficient and compact inverter solutions. This includes improving the power density of the inverter, reducing manufacturing costs, and improving performance stability to meet the growing market demand. At the same time, it is necessary to further explore new IGBT module designs and advanced heat dissipation technologies to solve problems such as complex system structure and heat dissipation difficulties, and promote the continuous innovation and progress of inverter technology. Utility Model Content

[0006] In view of the deficiencies in the prior art, we aim to provide a two-phase flow inverter to solve the following problems: When multiple IGBT modules are connected in parallel in a traditional inverter, due to the serious heat collection of the modules, a larger heat sink is required for heat dissipation, which leads to an increase in the size of the chassis and high structural costs. At the same time, the large space requirement also leads to complex wiring of the conductive row, further increasing the cost of structural materials. The utility model improves the heat dissipation efficiency and reduces the volume requirement of the heat sink by introducing two-phase flow technology, thereby reducing the size of the chassis and reducing the structural cost. At the same time, the conductive row wiring is simplified, the material cost is reduced, and a more optimized solution is provided for the performance and cost of the inverter.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A two-phase flow inverter, characterized in that it includes a structural shell, a fan, and a core assembly, wherein the fan is fixedly arranged at the top or bottom of the structural shell, the core assembly is arranged inside the structural shell, the core assembly includes a first IGBT module and a condensation plate, the first IGBT module is connected to the condensation plate through an evaporation tube and a condensation tube, and the condensation plate is fixedly arranged inside the structural shell.

[0009] A preferred technical solution, the movement assembly also includes a second IGBT module, a rectifier module, a control module and a bus capacitor, the bus capacitor is installed inside the structural shell through a laminated busbar and is located above the second IGBT module, the bus capacitor is evenly and symmetrically arranged, the condensation plate is fixedly arranged inside the structural shell and is located below the bus capacitor, the second IGBT module is fixedly installed on the side of the condensation plate, the rectifier module is fixedly installed on the side of the condensation plate and is located on one side of the second IGBT module, the control module is a thyristor drive board, the control module is fixedly arranged on the end side of the condensation plate, and a drive circuit board is arranged on the lower side of the second IGBT module.

[0010] According to a preferred technical solution, an inverter stack conductive bar is detachably stacked on the second IGBT module, and a gate drive board is detachably stacked on the inverter stack conductive bar.

[0011] According to a preferred technical solution, an input conductive bar is detachably stacked on the rectifier module, and a filter plate and a surge absorption plate are detachably stacked on the input conductive bar.

[0012] According to a preferred technical solution, the upper end of the laminated busbar is connected to a DC positive conductive bar and a DC negative conductive bar, and the lower end of the laminated busbar is connected to the positive and negative electrodes of the second IGBT module.

[0013] According to a preferred technical solution, the core assembly further comprises a current transformer and an output conductive bar, wherein the current transformer is disposed at the lower end of the second IGBT module, one end of the output conductive bar is connected to the second IGBT module and passes through the current transformer, and an absorption capacitor is disposed on the second IGBT module.

[0014] A preferred technical solution is that the movement assembly also includes a brake unit module, which is installed between the fan and the bus capacitor, one end of the brake unit module is provided with a brake conductive bar, the other end of the brake unit module is connected to the laminated bus bar, and a brake radiator is provided on the brake unit module.

[0015] According to a preferred technical solution, voltage-equalizing resistors are evenly arranged on the laminated busbars.

[0016] According to a preferred technical solution, a shielding sealing plate is installed on one side of the second IGBT module and the rectifier module, so that the second IGBT module and the rectifier module are located in an independent cavity.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Provide a compact inverter structure layout with better heat dissipation effect. Solve the technical problems of existing inverters with multiple modules in parallel at each gate level, large inverter size and poor heat dissipation. Compared with traditional inverters, this structural layout breaks through the physical limits of traditional inserts or skived-tooth heat sinks, making the power unit structure more compact and smaller, not only improving the power density, but also improving the heat dissipation effect.

[0019] 2. This structural layout is a book-style layout. The width of the movement components is very small, making the chassis slim, taking up little space during installation, and convenient for cabinet assembly.

[0020] 3. The electrical layout of this structure is more reasonable. From top to bottom, the busbar end to the busbar capacitor, the busbar capacitor to the IGBT module, and the IGBT module to the output conductive bar are all connected in one go and are close to each other, which will reduce the length of the conductive bar to the extreme. Thus, the structural cost is also compressed to the minimum.

[0021] 4. This structural layout has a more reasonable EMC layout, with strong current and weak current separated and not interfering with each other. The PCB circuit board is placed on the top plate to prevent the strong electromagnetic field of the conductive bus from interfering with the PCB weak current circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the first structure of the internal layout of the structural shell of the utility model;

[0023] Figure 2 This is a schematic diagram of the rear structure of one side of the structural shell of the utility model;

[0024] Figure 3 This is a schematic diagram of the side view of the internal layout of the structural shell of the utility model;

[0025] Figure 4 This is a schematic diagram of the front view of the internal layout of the structural shell of the utility model;

[0026] Figure 5 It is a schematic diagram of the overall structure of the utility model;

[0027] In the figure: 1, structural shell; 2, fan; 3, movement assembly; 301, first I GBT module; 302, condenser plate; 303, evaporator tube; 304, condenser tube; 305, second I GBT module; 306, rectifier module; 307, control module; 308, bus capacitor; 309, laminated busbar; 310, input conductive bar; 311, filter board; 312, surge absorption board; 313, DC positive conductive bar; 314, current transformer; 315, output conductive bar; 316, DC negative conductive bar; 317, absorption capacitor; 318, brake unit module; 319, brake conductive bar; 320, brake radiator; 321, shielding sealing board assembly; 322, drive circuit board. DETAILED DESCRIPTION

[0028] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] like Figure 1 and 2 As shown, a two-phase flow inverter includes a structural shell 1, a fan 2, and a core assembly 3. The fan 2 is fixedly arranged on the top or bottom of the structural shell 1, and the core assembly 3 is arranged inside the structural shell 1. The core assembly 3 includes a first IGBT module 301 and a condensing plate 302. The first IGBT module 301 is connected to the condensing plate 302 through an evaporating tube 303 and a condensing tube 304, and the condensing plate 302 is fixedly arranged inside the structural shell 1.

[0031] like Figure 1 and 2As shown, the movement assembly 3 also includes a second I GBT module 305, a rectifier module 306, a control module 307 and a bus capacitor 308. The bus capacitor 308 is installed inside the structural shell 1 through a laminated busbar 309 and is located above the second I GBT module 305. The bus capacitor 308 is evenly and symmetrically arranged. The condensing plate 302 is fixedly arranged inside the structural shell 1 and is located below the bus capacitor 308. The second I GBT module 305 is fixedly installed on the side of the condensing plate 302. The rectifier module 306 is fixedly installed on the side of the condensing plate 302 and is located on one side of the second I GBT module 305. The control module 307 is a thyristor drive board. The control module 307 is fixedly arranged on the end side of the condensing plate 302. A drive circuit board 322 is arranged on the lower side of the second I GBT module 305.

[0032] like Figure 1 and 3 As shown, the second IGBT module 305 is detachably stacked with an inverter stacked conductive bar, and the inverter stacked conductive bar is detachably stacked with a gate driver board. The rectifier module 306 is detachably stacked with an input conductive bar 310, and the input conductive bar 310 is detachably stacked with a filter board 311 and a surge absorption board 312. The stacked busbar 309 is connected to a DC positive conductive bar 313 and a DC negative conductive bar 316, and the stacked busbar 309 is connected to the positive and negative electrodes of the second IGBT module 305 at the bottom.

[0033] like Figure 1 and 3 As shown, the core assembly 3 also includes a current transformer 314 and an output conductive bar 315. The current transformer 314 is placed at the lower end of the second IGBT module 305. One end of the output conductive bar 315 is connected to the second IGBT module 305 and passes through the current transformer 314. The second IGBT module 305 is provided with an absorption capacitor 317.

[0034] like Figure 1 As shown, the core assembly 3 further includes a brake unit module 318, which is installed between the fan 2 and the bus capacitor 308. A brake conductive bar 319 is provided at one end of the brake unit module 318, and the other end of the brake unit module 318 is connected to the laminated bus bar 309. A brake radiator 320 is provided on the brake unit module 318. Voltage-equalizing resistors (not shown) are evenly arranged on the laminated bus bar 309.

[0035] like Figure 2 As shown, a shielding sealing plate assembly 321 is installed on one side of the second IGBT module 305 and the rectifier module 306, so that the second IGBT module 305 and the rectifier module 306 are located in an independent cavity.

[0036] like Figure 1-4As shown, in this embodiment, three gate-level IGBT modules are placed in parallel on the radiator, and each gate level is composed of one to multiple IGBT modules in a group, which are distributed in an array. The fan is an axial fan. The structural layout is a book-like layout, the structural housing 1 is very narrow, and the space utilization rate is extremely high. This structural layout has a high power density compared to the traditional inverter. In this embodiment, the IGBT module is placed on the condensing plate, connected by the evaporation tube 303 and the condensing tube 304 in the middle, and the fan 2 is placed above or below the IGBT module. In this embodiment, two gate-level IGBT modules are placed on one side of the condensing plate 302, and one gate-level IGBT module and a thyristor rectifier bridge are placed on the other side. In this embodiment, the bus capacitor is placed between the condensing plate 302 and the IGBT module, the brake radiator 320 is placed in the air duct, and the first IGBT module is placed obliquely to ensure the heat dissipation area while ensuring the width of the movement.

[0037] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A two-phase flow converter, characterized in that: The invention comprises a structural shell (1), a fan (2), and a core assembly (3), wherein the fan (2) is fixedly arranged at the top or bottom of the structural shell (1), and the core assembly (3) is arranged inside the structural shell (1). The core assembly (3) comprises a first IGBT module (301) and a condensation plate (302), wherein the first IGBT module (301) is connected to the condensation plate (302) via an evaporation tube (303) and a condensation tube (304), and the condensation plate (302) is fixedly arranged inside the structural shell (1).

2. A two-phase flow converter according to claim 1, characterized in that: The core assembly (3) further comprises a second IGBT module (305), a rectifier module (306), a control module (307) and a bus capacitor (308); the bus capacitor (308) is installed inside the structural housing (1) through a laminated busbar (309) and is located above the second IGBT module (305); the bus capacitor (308) is evenly and symmetrically arranged; the condenser plate (302) is fixedly arranged inside the structural housing (1) and is located below the bus capacitor (308); the second IGBT module (305) is fixedly arranged on the side of the condenser plate (302); the rectifier module (306) is fixedly arranged on the side of the condenser plate (302) and is located on one side of the second IGBT module (305); the control module (307) is a thyristor drive board; the control module (307) is fixedly arranged on the end side of the condenser plate (302); and a drive circuit board (322) is arranged on the lower side of the second IGBT module (305).

3. A two-phase flow converter according to claim 2, characterized in that: The second IGBT module (305) is detachably stacked with an inverter stack conductive bar, and the inverter stack conductive bar is detachably stacked with a gate drive board.

4. A two-phase flow converter according to claim 2, characterized in that: An input conductive bar (310) is detachably stacked on the rectifier module (306), and a filter plate (311) and a surge absorption plate (312) are detachably stacked on the input conductive bar (310).

5. A two-phase flow converter according to claim 2, characterized in that: The upper end of the laminated busbar (309) is connected to a DC positive conductive busbar (313) and a DC negative conductive busbar (316), and the lower end of the laminated busbar (309) is connected to the positive and negative electrodes of the second IGBT module (305).

6. A two-phase flow converter according to claim 2, characterized in that: The core assembly (3) further comprises a current transformer (314) and an output conductive bar (315); the current transformer (314) is disposed at the lower end of the second IGBT module (305); one end of the output conductive bar (315) is connected to the second IGBT module (305) and passes through the current transformer (314); and an absorption capacitor (317) is disposed on the second IGBT module (305).

7. A two-phase flow converter according to claim 2, characterized in that: The movement assembly (3) further comprises a brake unit module (318), wherein the brake unit module (318) is installed between the fan (2) and the bus capacitor (308), one end of the brake unit module (318) is provided with a brake conductive bar (319), the other end of the brake unit module (318) is connected to the laminated bus bar (309), and a brake radiator (320) is provided on the brake unit module (318).

8. A two-phase flow converter according to claim 2, characterized in that: Voltage-equalizing resistors are evenly arranged on the laminated busbar (309).

9. A two-phase frequency converter according to claim 2, characterized in that: A shielding sealing plate assembly (321) is installed on one side of the second IGBT module (305) and the rectifier module (306), so that the second IGBT module (305) and the rectifier module (306) are located in an independent cavity.

Images