Modular frequency converter

Abstract

The invention discloses a modularly designed frequency converter, which relates to the technical field of frequency converters and comprises a bottom shell, a middle shell is fixedly connected to one side of the bottom shell, a heat dissipation assembly is arranged in a channel formed by the middle shell and the bottom shell, a middle shell clamping seat is arranged at the upper end of the middle shell, and a control module is arranged in the middle shell. The upper end of the control module is provided with a pin header matched with the middle shell clamping seat, the pin header is electrically connected with the middle shell clamping seat, the pin header is inserted into the middle shell clamping seat to achieve fixation of the control module and the middle shell, one side of the bottom shell is provided with a driving module, the middle shell clamping seat is electrically connected with the driving module through a flat cable, and the control module is provided with a keyboard module. The keyboard module, the control module, the expansion module and the driving module are all designed in a modular mode, the development period can be shortened, fault isolation is achieved, and maintenance is easy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frequency converters, and specifically relates to a modularly designed frequency converter. BACKGROUND

[0002] As a core device in the field of electric power transmission, the standard structure of a frequency converter comprises four core components, i.e., a human-computer interaction panel (keyboard, liquid crystal screen, etc.), a control unit, a rectifier unit and an inverter unit, and each functional unit is assembled through a frequency converter shell. The above-mentioned unit integrated design is compact in structure, but has two potential problems: firstly, electromagnetic interference is easily coupled to adjacent circuits to cause signal distortion. Secondly, a faulty module may further damage other units, worsening the degree of failure. Furthermore, when replacing a faulty module, the disassembly steps are tedious, reducing work efficiency.

[0003] In terms of extended function implementation, the frequency converter expansion box, as a key peripheral component, is integrated with enhanced functions such as motor rotor position detection and industrial bus communication, and can effectively meet the needs of differentiated application scenarios. The traditional expansion card adopts a laminated installation scheme, and the hardware compatibility is limited. The control mainboard is only configured with fixed interfaces of a specific pitch, and cannot adapt to expansion modules of different specifications. Secondly, the installation process is complex. The complete installation process needs to perform the steps of operation panel disassembly, top cover removal, positioning hole calibration and fastening screw installation in sequence. In view of the above problems, we provide a modularly designed frequency converter. SUMMARY

[0004] The present application aims to provide a modularly designed frequency converter to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A modularly designed frequency converter comprises a bottom shell, one side of the bottom shell is fixedly connected with a middle shell, a heat dissipation assembly is arranged in a channel formed by the middle shell and the bottom shell, a middle shell clamping seat is arranged at the upper end of the middle shell, a control module is arranged in the middle shell, a pin header is arranged at the upper end of the control module and matched with the middle shell clamping seat, the pin header is electrically connected with the middle shell clamping seat, the pin header is inserted into the middle shell clamping seat to fix the control module and the middle shell, a drive module is arranged at one side of the bottom shell, the middle shell clamping seat is electrically connected with the drive module through a wire, a keyboard module is arranged on the control module, a network cable plug electrically connected with the control module clamping seat is arranged on the keyboard module, three-phase power input terminals, DC bus terminals and frequency converter output terminals are arranged at the lower end of the middle shell, an expansion module is further arranged at one side of the bottom shell, a connecting assembly is arranged between the expansion module and the drive module, an expansion module busbar is arranged at one side of the expansion module, a connecting guide groove is arranged at one side of the control module, and the connecting guide groove is electrically connected with the expansion module busbar.

[0007] As a further scheme of the present application: the position of the middle shell under the keyboard module is provided with a cover plate, the cover plate is used for covering the three-phase power input terminal, the DC bus terminal and the frequency converter output terminal, and the both side edges of the middle shell are provided with clamping seats for fixing the cover plate.

[0008] As a further scheme of the present application: the bottom shell is fixedly connected with a protruding edge at the upper end and the lower end away from the middle shell, and mounting holes are formed in the both sides of the protruding edge.

[0009] As a further scheme of the present application: the heat dissipation assembly comprises a heat dissipation fan, the heat dissipation fan is installed in the channel formed by the bottom shell and the middle shell, a ventilation compartment cover is installed at the upper end of the channel formed by the bottom shell and the middle shell, a grid plate is installed at the lower end of the channel formed by the bottom shell and the middle shell, and a grounding terminal is fixedly connected to the grid plate.

[0010] As a further scheme of the present application: the side of the keyboard module close to the control module is provided with a buckle, and the control module is provided with a buckle seat matched with the buckle of the keyboard module.

[0011] As a further scheme of the present application: the upper end of the cover plate is provided with a signboard.

[0012] As a further scheme of the present application: the connecting assembly comprises a bottom shell clamping groove, the bottom shell clamping groove is arranged at the position of the drive module shell, and the side of the extension module close to the drive module is provided with an elastic buckle matched with the bottom shell clamping groove.

[0013] As a further scheme of the present application: the extension module comprises an adapter card, an encoder card and a communication card, the side of the encoder card is provided with a plug-in wiring terminal, the wiring terminal is used for electrically connecting a motor encoder, one end of the encoder card is provided with a third busbar, the adapter card is provided with a fourth busbar, the fourth busbar is electrically connected with the third busbar by using a wire, the side of the encoder card close to the edge of the extension module shell body is provided with a second communication interface, an antenna is electrically connected in the second communication interface, the communication card is provided with a first busbar, the first busbar is electrically connected with the third busbar by using a wire, the encoder card and the communication card are arranged side by side, the communication card is provided with a first communication interface, and the first communication interface extends to the edge of the extension module through the slot of the side of the extension module shell body.

[0014] As a further scheme of the present application: the adapter card, the encoder card and the communication card are respectively fixed in the interior of the extension module shell body by using screws.

[0015] As a further scheme of the present application: the side of the bottom shell is provided with a first exhaust port at the lower end, and the other side of the bottom shell is provided with a second exhaust port at the lower end.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1、 The keyboard module, control module, expansion module and drive module of the application are modularly designed, which can shorten the development cycle, realize fault isolation and be easy to maintain.

[0018] 2、 The expansion module of the application can flexibly combine encoder cards and communication cards, support customized function expansion, and be installed on the side of the frequency converter through buckling without disassembling the top cover, thus being convenient to install. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the application.

[0020] Figure 2 It is a split structural schematic diagram of the application.

[0021] Figure 3 It is a front view structural schematic diagram of the application.

[0022] Figure 4 It is a left view structural schematic diagram of the application.

[0023] Figure 5 It is a bottom structural schematic diagram of the application.

[0024] Figure 6 It is an internal structural schematic diagram of the expansion module in the application.

[0025] 1、 keyboard module; 2、 control module; 3、 drive module; 4、 expansion module; 5、 bottom shell; 6、 cover plate; 7、 cooling fan; 8、 ventilation bin cover; 9、 connecting guide groove; 10、 expansion module busbar; 11、 wiring terminal; 12、 antenna; 13、 signboard; 14、 control module card seat; 15、 middle shell; 16、 middle shell card seat; 17、 three-phase power input terminal; 18、 direct current bus terminal; 19、 frequency converter output terminal; 20、 first exhaust port; 21、 bottom shell card slot; 22、 mounting hole; 23、 grounding terminal; 24、 grille plate; 25、 adapter card; 26、 encoder card; 27、 communication card; 28、 first busbar; 29、 screw; 30、 third busbar; 31、 first communication interface; 32、 elastic buckle; 33、 second exhaust port; 34、 fourth busbar; 35、 second communication interface. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0027] Please refer toFigure 1 and Figure 2 In the embodiment of the present application, a modularly designed frequency converter comprises a bottom shell 5, one side of the bottom shell 5 is fixedly connected with a middle shell 15, the upper end and the lower end of the side of the bottom shell 5 away from the middle shell 15 are fixedly connected with protruding edges, and mounting holes 22 are formed on both sides of the protruding edges; the bottom shell 5 and the middle shell 15 constitute the core frame of the frequency converter, and provide stable installation reference for internal modular components, the protruding edges not only can enhance the structural strength of the edge of the bottom shell, avoid deformation due to stress in long-term use, but also can be adapted to the guide rails or fixed supports of standard cabinets through the mounting holes 22 formed on both sides thereof, so that the overall quick positioning and fastening of the frequency converter are realized through the bolts penetrating the mounting holes, and various installation requirements such as wall hanging and cabinet installation in industrial scenes are met.

[0028] Please refer to Figure 2 , Figure 4 and Figure 5 , the channel formed by the middle shell 15 and the bottom shell 5 is provided with a heat dissipation assembly, the heat dissipation assembly comprises a heat dissipation fan 7, the heat dissipation fan 7 is installed in the channel formed by the bottom shell 5 and the middle shell 15, a ventilation bin cover 8 is installed at the upper end of the channel formed by the bottom shell 5 and the middle shell 15, a grating plate 24 is installed at the lower end of the channel formed by the bottom shell 5 and the middle shell 15, a grounding terminal 23 is fixedly connected to the grating plate 24, a first exhaust port 20 is formed at the lower end of one side of the bottom shell 5, and a second exhaust port 33 is formed at the lower end of the other side of the bottom shell 5; the heat dissipation fan 7 is installed in the middle part of the channel, and the heat transferred to the channel wall by the core heating components such as the driving module 3 and the control module 2 is quickly taken away by the directional airflow, and then discharged from the channel, so that the directional migration of heat is realized, the grounding terminal 23 fixed on the grating plate 24 can quickly guide away the static electricity and potential leakage current generated in the operation of the frequency converter by being connected with the equipment shell and the grounding system, so as to avoid the interference or safety hazards caused by the accumulation of electric charges on the electronic modules.

[0029] Please refer to Figure 2The upper end of the middle shell 15 is provided with a middle shell clamping seat 16, and the middle shell 15 is provided with a control module 2. The upper end of the control module 2 is provided with a pin array matched with the middle shell clamping seat 16. The pin array is electrically connected with the middle shell clamping seat 16. The pin array is inserted into the middle shell clamping seat 16 to fix the control module 2 and the middle shell 15. One side of the bottom shell 5 is provided with a driving module 3. The middle shell clamping seat 16 is electrically connected with the driving module 3 through a wire. The control module 2 is provided with a keyboard module 1. The keyboard module 1 is provided with a network cable plug electrically connected with the control module clamping seat 14. One side of the keyboard module 1 close to the control module 2 is provided with a buckle. The control module 2 is provided with a buckle seat matched with the buckle of the keyboard module 1. The middle shell clamping seat 16 is a core interface for mechanically fixing the control module 2 and the whole machine frame and signal interaction. The middle shell clamping seat 16 is internally integrated with arranged conductive contacts, which not only serves as an installation reference of the control module 2, but also bears the function of signal relay. The control module 2 is a central processing unit of the frequency converter. The pin array designed on the upper end of the control module 2 forms a matched plug structure with the middle shell clamping seat 16. When the pin array is inserted into the clamping seat, the control module and the middle shell are electrically connected through the close contact between the pin and the contact, which ensures the stable transmission of control commands, state feedback and other signals. The mechanical fixation is realized through the physical engagement between the pin array and the clamping seat. The module positioning can be completed without additional screws, which greatly simplifies the installation and disassembly process and reflects the convenience of modular design.

[0030] The keyboard module 1 carried on the control module 2 is a core carrier for human-computer interaction, which is used for parameter setting, state monitoring and other functions. The network cable plug is inserted into the control module clamping seat 14 to realize the high-speed transmission of key signal and display signal through multi-core wires, which guarantees the real-time performance of human-computer interaction.

[0031] Please refer to Figure 2The lower end of the middle shell 15 is provided with three-phase power input terminals 17, DC bus terminals 18 and frequency converter output terminals 19. The middle shell 15 is provided with a cover plate 6 below the keyboard module 1, which is used to cover the three-phase power input terminals 17, DC bus terminals 18 and frequency converter output terminals 19. The two side edges of the middle shell 15 are provided with clamping seats for fixing the cover plate 6. The upper end of the cover plate 6 is provided with a signboard 13. The three-phase power input terminals 17 are used to access external industrial three-phase alternating current to provide raw power for the internal rectifier unit of the frequency converter. The DC bus terminals 18 connect the rectifier unit and the inverter unit, and bear the transmission function of the rectified DC voltage. Through the terminals, voltage monitoring on the DC side, energy storage capacitor connection or DC bus parallel connection of multiple frequency converters can be realized to improve the power supply stability of the system. The frequency converter output terminals 19 deliver the adjustable frequency and voltage alternating current output by the inverter unit to the motor, and finally realize precise control of the motor speed and torque. The orderly arrangement of the three along the lower end of the middle shell 15 not only shortens the length of the internal wires, but also reduces line loss and electromagnetic interference. The shielding of the cover plate 6 can effectively prevent accidental contact of the operator and cause electric shock accidents. At the same time, it blocks dust, oil stains, water vapor and other impurities in the workshop environment from entering the terminal connection, avoids terminal oxidation, poor contact or short circuit failure caused by impurity accumulation, and indirectly improves the service life and electrical connection reliability of the terminals.

[0032] Please refer to Figure 2 and Figure 6 One side of the bottom shell 5 is also provided with an expansion module 4. A connection assembly is arranged between the expansion module 4 and the drive module 3. The connection assembly includes a bottom shell clamping groove 21 arranged at the position of the drive module 3 shell. The side of the expansion module 4 close to the drive module 3 is provided with an elastic buckle 32 matched with the bottom shell clamping groove 21. The bottom shell clamping groove 21 and the elastic buckle 32 not only realize the stable connection of the expansion module 4 and the drive module 3, but also strengthen the modularization advantages of the frequency converter from the aspects of operation and maintenance efficiency, operation reliability and function compatibility, and meet the needs of industrial scenes for on-demand expansion and rapid operation and maintenance of frequency converters.

[0033] Please refer to Figure 6The side of the expansion module 4 is provided with an expansion module female bus 10, one side of the control module 2 is provided with a connecting guide groove 9, the connecting guide groove 9 is electrically connected with the expansion module female bus 10, the expansion module 4 comprises a conversion card 25, an encoder card 26 and a communication card 27, one side of the encoder card 26 is provided with a plug-in terminal 11, the terminal 11 is used for electrically connecting a motor encoder, one end of the encoder card 26 is provided with a third female bus 30, the conversion card 25 is provided with a fourth female bus 34, the fourth female bus 34 is electrically connected with the third female bus 30 by using a wire harness, one side of the encoder card 26 close to the edge of the shell of the expansion module 4 is provided with a second communication interface 35, the second communication interface 35 is electrically connected with an antenna 12, the communication card 27 is provided with a first female bus 28, the first female bus 28 is electrically connected with the third female bus 30 by using a wire harness, the encoder card 26 and the communication card 27 are arranged side by side, the communication card 27 is provided with a first communication interface 31, the first communication interface 31 extends to the edge of the expansion module 4 through the slot in the side of the shell of the expansion module 4, the conversion card 25, the encoder card 26 and the communication card 27 are fixed in the shell of the expansion module 4 by using screws 29; the expansion module 4 is the core of function expansion of the frequency converter, the internal components thereof take the expansion module female bus 10 as the energy and signal hub, and provide power supply and signal transmission for the conversion card 25, the encoder card 26 and the communication card 27, the connecting guide groove 9 on one side of the control module 2 is electrically connected with the expansion module female bus 10, and directional heat dissipation can be formed, so that stable work of the components is guaranteed, the conversion card 25 is connected with the third female bus 30 of the encoder card 26 through the fourth female bus 34 and the shielded wire harness, signal adaptation and coordination are realized, the encoder card 26 is connected with the motor encoder through the plug-in terminal 11, the second communication interface 35 close to the edge of the shell of the expansion module 4 and the internally electrically connected antenna 12 support wireless expansion, the communication card 27 is connected with the third female bus 30 of the encoder card 26 through the first female bus 28, and the first communication interface 31 extends to the edge through the slot in the side of the shell of the expansion module 4, so that the external bus is convenient to connect, the conversion card 25, the encoder card 26 and the communication card 27 are arranged side by side and fixed in the shell of the expansion module 4 by using the screws 29, space is saved, and the conversion card 25, the encoder card 26 and the communication card 27 are convenient to disassemble and assemble individually, and the modular advantages of flexible function combination, stable signal transmission and convenient maintenance are realized.

[0034] The working principle of the present application is that the external industrial three-phase alternating current is connected to the internal rectifier unit of the frequency converter through the three-phase power input terminal 17 at the lower end of the middle shell 15, is converted into direct current after rectification, and is transmitted to the inverter unit through the direct current bus terminal 18, meanwhile, the direct current bus terminal 18 can be externally connected with an energy storage capacitor or realize parallel connection of multiple frequency converters, so as to improve the power supply stability and lay a foundation for subsequent power conversion.

[0035] The control module 2 is mechanically fixed and signal-interacted with the whole machine frame through the plug-in connection of the upper end row pin with the middle shell card seat 16, the middle shell card seat 16 is communicated with the control module and the drive module 3 through the wire, so that the control module 2 can send speed, torque and other control instructions to the drive module 3, and receive the running state signal fed back by the drive module 3. The user realizes man-machine interaction through the keyboard module 1, the keyboard module 1 is connected with the control module card seat 14 through the network cable plug, and the parameter setting such as frequency, voltage, start-stop instruction and other signals are transmitted to the control module 2, and the corresponding control signal is generated after the control module 2 processes, and the frequency converter running data is fed back to the keyboard module 1 for real-time monitoring by the user.

[0036] After receiving the instruction of the control module, the drive module 3 drives the internal inverter unit to inversely convert the direct current transmitted by the direct current bus into alternating current with adjustable frequency and adjustable voltage, and delivers the alternating current to the controlled motor through the frequency converter output terminal 19 at the lower end of the middle shell 15, so as to finally realize precise control of the motor speed and torque, and meet the power demand of different industrial scenes.

[0037] When the frequency converter is running, the control module 2, the drive module 3 and other core components will generate heat, at this time, the heat dissipation fan 7 in the passage between the bottom shell 5 and the middle shell 15 is started, which quickly takes away the heat transferred by the passage wall through directional airflow, the hot air is discharged through the upper end ventilation cover 8 of the passage, and the cold air is sucked from the lower end grid plate 24; at the same time, the connecting guide groove 9 on the side of the expansion module 4 obtains power supply through the expansion module bus 10, and the adapter card 25, the encoder card 26 and the communication card 27 in the expansion module 4 are directionally cooled, so as to ensure that the temperature of all modules is controlled within the safety threshold. In addition, the grounding terminal 23 on the grid plate 24 is connected with the equipment shell and the grounding system, which can quickly guide away the static electricity and leakage current, so as to avoid interference or safety hazards; the cover plate 6 on the middle shell 15 covers the power supply and the output terminal, which prevents accidental electric shock and dust and oil pollution, and ensures the operation safety.

[0038] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Although the present application is described according to the embodiments, each embodiment only contains one technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A modularly designed frequency converter, comprising a base housing (5), characterized in that: A middle shell (15) is fixedly connected to one side of the bottom shell (5). A heat dissipation component is provided in the channel formed by the middle shell (15) and the bottom shell (5). A middle shell holder (16) is provided at the upper end of the middle shell (15). A control module (2) is provided inside the middle shell (15). A pin header that mates with the middle shell holder (16) is provided at the upper end of the control module (2). The pin header is electrically connected to the middle shell holder (16). The pin header is inserted into the middle shell holder (16) to fix the control module (2) to the middle shell (15). A drive module (3) is provided on one side of the bottom shell (5). The middle shell holder (16) is electrically connected to the drive module (3) by a ribbon cable. The control module (2) is provided with a keyboard module (1), and the keyboard module (1) is provided with a network cable plug that is electrically connected to the control module card slot (14). The lower end of the middle shell (15) is provided with a three-phase power input terminal (17), a DC bus terminal (18) and a frequency converter output terminal (19). The bottom shell (5) is also provided with an expansion module (4) on one side. A connection component is provided between the expansion module (4) and the drive module (3). An expansion module busbar (10) is provided on one side of the expansion module (4). A connection guide groove (9) is provided on one side of the control module (2). The connection guide groove (9) is electrically connected to the expansion module busbar (10).

2. The modularly designed frequency converter according to claim 1, characterized in that, The middle shell (15) is provided with a cover plate (6) located below the keyboard module (1). The cover plate (6) is used to cover the three-phase power input terminal (17), the DC bus terminal (18) and the inverter output terminal (19). The middle shell (15) has snap-fit ​​seats distributed on both sides for fixing the cover plate (6).

3. The modularly designed frequency converter according to claim 1, characterized in that, The bottom shell (5) is fixedly connected to the upper and lower ends of the side away from the middle shell (15), and mounting holes (22) are provided on both sides of the protruding edge.

4. The modularly designed frequency converter according to claim 1, characterized in that, The heat dissipation assembly includes a cooling fan (7), which is installed in the channel formed by the bottom shell (5) and the middle shell (15). A ventilation cover (8) is installed at the upper end of the channel formed by the bottom shell (5) and the middle shell (15), and a grille plate (24) is installed at the lower end of the channel formed by the bottom shell (5) and the middle shell (15). A grounding terminal (23) is fixedly connected to the grille plate (24).

5. A modularly designed frequency converter according to claim 1, characterized in that, The keyboard module (1) has a buckle on the side near the control module (2), and the control module (2) has a buckle seat that matches the buckle of the keyboard module (1).

6. A modularly designed frequency converter according to claim 2, characterized in that, The cover plate (6) is provided with an identification plate (13) at its upper end.

7. A modularly designed frequency converter according to claim 1, characterized in that, The connecting component includes a bottom shell slot (21), which is located on the outer shell of the drive module (3). The expansion module (4) has an elastic buckle (32) that cooperates with the bottom shell slot (21) on the side near the drive module (3).

8. A modularly designed frequency converter according to claim 7, characterized in that, The expansion module (4) includes an adapter card (25), an encoder card (26), and a communication card (27). The encoder card (26) has a pluggable terminal block (11) on one side, which is used to electrically connect to the motor encoder. The encoder card (26) has a third busbar (30) at one end, and the adapter card (25) has a fourth busbar (34). The fourth busbar (34) and the third busbar (30) are electrically connected by a ribbon cable. The encoder card (26) is located near the edge of the expansion module (4) housing. A second communication interface (35) is provided on one side of the edge. An antenna (12) is electrically connected inside the second communication interface (35). A first busbar (28) is provided on the communication card (27). The first busbar (28) and the third busbar (30) are electrically connected by a ribbon cable. The encoder card (26) and the communication card (27) are arranged side by side. A first communication interface (31) is provided on the communication card (27). The first communication interface (31) extends to the edge of the expansion module (4) through a slot on the side of the expansion module (4) housing.

9. A modularly designed frequency converter according to claim 8, characterized in that, The adapter card (25), encoder card (26) and communication card (27) are fixed inside the housing of the expansion module (4) with screws (29).

10. A modularly designed frequency converter according to claim 4, characterized in that, A first exhaust port (20) is provided at the lower end of one side of the bottom shell (5), and a second exhaust port (33) is provided at the lower end of the other side of the bottom shell (5).

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