A portable gas shielded welding machine of silicon carbide

Abstract

The utility model provides a portable gas shielded welding machine of silicon carbide, including the casing, internal portion, the casing includes bottom plate, front panel, back panel, middle layer board, the middle layer board is installed in the upper portion, and bottom plate bears front panel and back panel, middle layer board and shell, in addition adopt silicon carbide single tube as inverter, and the working frequency improves, and the static external characteristic and the fast dynamic response make that the welding arc is stable, because of adopting silicon carbide single tube, compared with IGBT, its heat dissipation characteristic improves, therefore the radiator volume reduces, the overall volume reduces, the whole machine volume is small while the current is not small, cost reduction, mobile operation is more convenient. The utility model simple structure is reasonable, and the inverter part is isolated to the air duct, prevents dust from entering the inverter area, improves the reliability, has the ability of a variety of metal welding, is a kind of industrial grade high performance, high temporary load rate, high reliability high -efficient energy -conserving environmental protection welding equipment.

Description

Technical Field

[0001] This utility model belongs to the field of welding machine technology, specifically relating to a portable silicon carbide gas shielded welding machine. Background Technology

[0002] With the continuous development of the manufacturing industry, higher demands are being placed on the performance, portability, and energy efficiency of welding equipment. In numerous welding scenarios, such as machinery manufacturing, automotive repair, and steel structure processing, gas-shielded welding (GSW) is widely used due to its high efficiency and excellent welding results. Traditional GSW equipment has limitations in power density, portability, and energy consumption, making it difficult to meet the needs of modern industrial development. Portable GSW equipment, due to its high mobility and adaptability to different work sites, is experiencing continuous market demand growth. Especially in outdoor operations, small repair shops, and locations with strict space requirements, portable GSW equipment offers significant advantages.

[0003] Conventional small-volume gas-shielded welding often uses IGBT single-transistor fabrication, resulting in poor overall heat dissipation and durability. Silicon carbide (SiC), as a third-generation semiconductor material, exhibits superior performance in power electronics. Compared to traditional silicon-based materials, SiC possesses higher breakdown electric field strength, thermal conductivity, and electron mobility. Applying SiC technology to gas-shielded welding equipment can significantly increase inverter frequency, achieve high power density, reduce equipment size and weight, and simultaneously improve thermal stability and energy efficiency. Currently, silicon carbide technology has been widely applied and achieved significant results in fields such as new energy vehicles and photovoltaic power generation. Utility Model Content

[0004] The purpose of this invention is to provide a portable silicon carbide gas shielded welding machine with a reasonable and simple structure, improved duty cycle and reliability, and good static external characteristics and fast dynamic response due to digital control.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A portable silicon carbide gas shielded welding machine includes a housing and an internal part;

[0007] The casing includes a bottom plate, a front panel, a rear panel, and a middle plate. The middle plate is installed on the upper part, and the bottom plate supports the front panel, the rear panel, the middle plate, and the outer shell.

[0008] The front panel is equipped with a display board on top, which includes a digital display tube, a function switch, a voltage parameter adjustment knob, an inductance adjustment knob, and a current adjustment knob. The display board is used to display welding parameters, switch functions, and preset parameters. The front panel has symmetrically arranged assembly output socket positive and negative terminals in the middle. A seven-pin aviation socket is provided between the assembly output socket positive and negative terminals. The seven-pin aviation socket is used to connect the motor, air valve, gun switch, and control box of the wire feeder for communication. The front panel also has a vent at the bottom for the air duct outlet.

[0009] The rear panel is equipped with an air switch to control the power supply. A waterproof power cord connector is located on the upper left side of the rear panel. The waterproof power cord connector is used to fix the power cord and reduce the area occupied. A 36V heater base is also located above the rear panel to provide power for heating the gas meter. A rear panel vent is located below the vent. A 380V high-speed axial flow fan is installed inside the rear panel vent to dissipate heat from the internal power components. Because a high-speed axial flow fan is used, its size is reduced compared to conventional fans, while the airflow speed is not reduced, thus reducing the internal volume occupied by the machine.

[0010] An inverter heatsink is located on the right side of the base plate. The inverter heatsink is mounted on the base plate via a heatsink bracket. An inverter board is mounted on the inverter heatsink, and the inverter board houses eight silicon carbide single-tube transistors and four filter capacitors. The silicon carbide single-tube transistors and filter capacitors are integrated into the inverter board, resulting in a smaller overall space occupied by the inverter and filter sections, thus allowing for a smaller internal machine design. Because eight silicon carbide single-tube transistors are used, their frequency is higher than that of conventional IGBTs, and their heat dissipation performance is superior to that of conventional IGBT single-tube transistors. The heatsink is also smaller than that of a conventional welding machine's inverter heatsink. The size is reduced, and the weight of the whole machine is reduced compared to conventional welding machines without reducing the actual operating current. The heat sink bracket is equipped with an absorption plate to absorb the peak voltage generated when the inverter board is working. The heat sink is also equipped with a three-phase rectifier bridge, which is used to rectify the three-phase AC power and provide smooth DC power to the inverter board. The three-phase rectifier bridge and the inverter board are all installed on the inverter heat sink. Compared with conventional welding machines, the internal area occupied by the inverter heat sink is reduced, which reduces the size of the whole machine and thus achieves the portability of the whole machine.

[0011] A secondary rectifier heat sink is installed on the left side of the base plate. The secondary rectifier heat sink has four secondary rectifier boards. Each secondary rectifier board has three 80A / 400V fast recovery rectifier tubes, which are used to rectify and output the voltage after the main transformer step-down inverter. The output end of the secondary rectifier heat sink is connected to the positive terminal of the machine's positive output terminal assembly output socket through an output aluminum strip. A Hall sensor is connected in series on the output aluminum strip to detect the output current signal and feed it back to the main control board.

[0012] The middle layer board has an adapter board and a power transformer located above the rear panel. The adapter board provides AC power to the fan and the power transformer. A driver box is mounted on the upper right side of the middle layer board. The output terminals of the driver box are connected to the drive pins of the silicon carbide single tubes on the inverter board for driving the silicon carbide single tubes. The primary wire of the driver box is connected to the main control board. The main control board is located at the upper front of the middle layer board. The main control board is used to calculate various parameters and output given signals and drive signals to the driver box. The main control board is connected to the display board for data communication. The main control board is connected to the seven-pin aviation socket on the front panel for data communication with the control box of the external wire feeder.

[0013] A main transformer is installed below the middle layer plate. The main transformer uses a microcrystalline magnetic core. The center tap of the main transformer is connected to the negative terminal of the assembled output socket on the front panel. Since the main transformer is suspended below the middle layer plate, the heat dissipation of the main transformer is greatly improved.

[0014] This enhances reliability and reduces the size and weight of the ferrite main transformer compared to conventional welding machines. It also increases the operating frequency and improves efficiency. The two primary windings of the main transformer are connected to the output of the inverter board, and the four secondary windings are connected to the left secondary rectifier board. The transformer is rectified and output through the secondary rectifier board. The center tap of the main transformer is connected to one end of the output inductor on the base plate, and the other end of the output inductor is connected to the negative terminal of the assembled output socket.

[0015] Preferably, the inverter heat sink is supported by a bracket, which is isolated from the intermediate air duct to reduce the entry of metal dust and improve the reliability of the inverter section.

[0016] Preferably, the main transformer is suspended and installed below the middle layer plate to enhance heat dissipation performance.

[0017] Preferably, the bottom of the base plate is equipped with swivel casters and directional casters for quick movement and positioning of the housing.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model has a reasonable and simple structure. The upper left side of the rear panel is equipped with a waterproof power cord connector. Compared with the conventional three-phase input socket, the waterproof connector reduces the area occupied, so the width of the rear panel can be reduced, thereby reducing the size of the machine. The inverter part is isolated from the air duct to prevent dust from entering the inverter area, improving reliability. In addition, the use of silicon carbide single tube as inverter increases the operating frequency, improves static external characteristics and fast dynamic response, making the welding arc stable. Due to the use of silicon carbide single tube, its heat dissipation characteristics are improved compared with IGBT, so the heat sink size is reduced and the overall machine size is reduced. While the current remains the same, the overall machine size is reduced, the cost is reduced and the weight is reduced, making mobile operation more convenient.

[0020] This invention has the capability to weld multiple metals and is an industrial-grade, high-performance, high-load-rate, high-reliability, high-efficiency, energy-saving, and environmentally friendly welding equipment. Attached Figure Description

[0021] Figure 1 This is a perspective view of a portable silicon carbide gas shielded welding machine according to the present invention.

[0022] Figure 2 This is a front view of a portable silicon carbide gas shielded welding machine according to the present invention.

[0023] Figure 3 This is a rear view of a portable silicon carbide gas shielded welding machine according to the present invention.

[0024] Figure 4 This is a left view of a portable silicon carbide gas shielded welding machine according to the present invention (left and right side covers omitted).

[0025] Figure 5 This is a right view of a portable silicon carbide gas shielded welding machine according to the present invention (left and right side covers omitted).

[0026] Figure 6 This is a top view of a portable silicon carbide gas shielded welding machine according to the present invention (top cover plate omitted).

[0027] Figure 7 This is a schematic diagram of the base plate structure of a portable silicon carbide gas shielded welding machine according to the present invention.

[0028] Figure 8 This is a schematic diagram of the main circuit of a portable silicon carbide gas shielded welding machine according to the present invention.

[0029] The serial numbers in the diagram are as follows:

[0030] 1. Display panel; 2. Digital tube; 3. Changeover switch; 4. Voltage adjustment knob; 5. Inductance adjustment knob; 6. Current adjustment knob; 7. Positive terminal of assembled output socket; 8. Negative terminal of assembled output socket; 9. Seven-pin aviation socket; 10. Front panel vent; 11. Air switch; 12. 36V heater socket; 13. Waterproof power cord connector; 14. Rear panel vent; 15. Fan; 16. Secondary rectifier board; 20. Secondary heat sink; 21. Output aluminum strip; 22. Hall sensor; 23. Main transformer; 24. Output inductor; 25. Three-phase rectifier bridge; 26. Inverter board; 27. Absorption plate; 28. Inverter heat sink; 29. ​​Heat sink bracket; 30. Silicon carbide single tube; 31. Filter capacitor; 32. Adapter board; 33. Power transformer; 34. Driver box; 35. Main control board. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] like Figures 1 to 7 As shown, this embodiment provides a portable silicon carbide gas shielded welding machine, which includes a housing and an internal part.

[0033] The casing includes a bottom plate, a front panel, a rear panel, a middle layer plate, left and right side panels, and a top cover plate; the bottom plate, left and right side panels, rear panel, top cover plate, and front panel form the six sides of the casing; the middle layer plate is installed at the top; the bottom plate supports the left and right side panels, rear panel, middle layer plate, front panel, and top cover plate; the front panel ( Figure 2 The front panel is equipped with a prefabricated output socket positive terminal 7 and a prefabricated output socket negative terminal 8. The positive output socket is located on the left side of the center of the front panel, and the negative prefabricated output socket negative terminal 8 is located on the right side of the center of the front panel. When manual welding is performed, the ground wire is connected to the negative terminal, and the welding clamp is connected to the positive terminal. When gas shielded welding is performed, the ground wire is connected to the negative output socket, and the positive output socket is connected to the wire feeder output end. The front panel is also equipped with a display board 1, a digital tube 2, a selector switch 3, a voltage adjustment knob 4, an inductance adjustment knob 5, a current adjustment knob 6, a seven-pin aviation socket 9, and a front panel vent 10.

[0034] The rear panel ( Figure 3The device is equipped with a waterproof power cord connector 13 for power input. The power cord enters the waterproof connector and connects to the air switch. The lower end connects to the three-phase rectifier bridge of the main circuit to provide AC power to the main circuit. The air switch 11 is used to control the power on and off and is located on the upper right side of the rear panel. Above the rear panel is a 36V heater base 12 for providing power for gas meter heating. Below the heater base is an external air vent 14, inside which is an axial fan 15 to dissipate heat from the internal power devices.

[0035] The left side of the base plate ( Figure 4 The main transformer is equipped with a secondary heat sink 20, which has four secondary rectifier boards 16 on it. The rectifier boards rectify the AC power after it is stepped down from the main transformer 23 and transmit it to the positive output terminal through the aluminum strip 21. A Hall sensor 22 is connected in series with the aluminum strip to detect the output current signal and feed it back to the main control board. The center tap of the main transformer is connected to one end of the output inductor 24 and the other end is connected to the negative output terminal 8 on the front panel.

[0036] The right side of the base plate ( Figure 5 The inverter heat sink 28 is installed, on which a three-phase rectifier bridge 25 is mounted. The three-phase rectifier bridge 25 is used to rectify the three-phase AC power and provide smooth DC power to the inverter board 26. The three-phase rectifier bridge 25 and the inverter board 26 are both mounted on the inverter heat sink 28. Compared with conventional welding machines, the internal area occupied by the inverter heat sink 28 is reduced, thereby reducing the overall size of the machine and achieving portability. The inverter board 26 is mounted on the inverter heat sink and has four filter capacitors 31 and eight silicon carbide single tubes 30. It is mainly used to filter the DC power after three-phase rectification and form H-bridge modular inverter AC power to provide high-frequency AC power to the primary of the main transformer. In addition, an absorption plate 27 is mounted on the heat sink bracket to suppress and absorb the spikes generated by the four sets of silicon carbide single tubes of the inverter board when they are working. Because of the eight silicon carbide single tubes, the frequency is higher than that of conventional IGBTs, and the heat dissipation performance is better than that of conventional IGBT single tubes. The heat sink 28 is smaller than that of conventional welding machine inverter heat sinks, and the weight of the whole machine is reduced compared with conventional welding machines without reducing the actual working current.

[0037] The middle layer plate ( Figure 6On the upper part of the rear panel, there is an adapter board 32, which provides AC 380V to the fan and power transformer. The middle panel contains a power transformer 33, which provides AC power to the main control board and heater. There is also a drive box 34, which contains a drive board for silicon carbide single tubes. This encloses the drive components to prevent problems caused by moisture or metal dust. The main control board 35 is located on the upper part of the middle panel. The main control board is used to process the output current and voltage signals, perform PI calculations, receive preset current and voltage parameters from the panel, output drive signals to the drive box to drive the silicon carbide single tubes on the inverter board, and simultaneously output voltage signals to the motor and air valve, and communicate with the wire feeder.

[0038] A main transformer 23 is installed below the middle layer plate. The main transformer 23 uses a microcrystalline magnetic core. The center tap of the main transformer 23 is connected to the negative terminal 8 of the assembled output socket on the front panel. Since the main transformer 23 is suspended below the middle layer plate, the heat dissipation of the main transformer is greatly improved.

[0039] Improved heat dissipation enhances the reliability of the main transformer. Compared to the ferrite main transformer used in conventional welding machines, it is smaller in size and lighter in weight, while the operating frequency and efficiency are improved. The two primary windings of the main transformer 23 are connected to the output end of the inverter board 26, and the four secondary windings are connected to the left secondary rectifier board 16 respectively. The output is rectified by the secondary rectifier board. The center tap of the main transformer 23 is connected to one end of the output inductor 24 on the base plate, and the other end of the output inductor 24 is connected to the negative terminal 8 of the assembled output socket.

[0040] The base plate ( Figure 7 The bottom plate has two ventilation openings 36, which help with ventilation below and prevent water from accumulating inside the machine.

[0041] The working principle of the whole machine is as follows ( Figure 8 In specific implementation, the main power supply of 380V is input from the waterproof connector, and the other end is connected to the three-phase rectifier bridge through the air switch and the output terminal of the air switch. After rectification, it is filtered into DC power by the filter capacitor of the inverter board, and then provides stable DC power to the right silicon carbide single tube. After being inverted by the silicon carbide single tube to form AC power of H bridge, it is output to the primary of the main transformer. The voltage after the secondary step-down is rectified by four secondary rectifier boards and output through the positive output socket. The negative terminal is filtered by the output inductor and then connected to the negative output socket of the main unit.

[0042] The panel is used for parameter adjustment, switching and display, and sending and receiving signals. The signals are transmitted to the main control board, which sends drive signals to the drive box. In addition, the main control board sends motor drive and solenoid valve drive voltages to the seven-pin aviation connector for driving the external wire feeder motor and air valve. The drive box shapes the input signals and outputs four sets of drives to drive the silicon carbide single tube. The absorption plate is used to absorb the peak voltage on the silicon carbide module and stabilize it.

[0043] This embodiment features a reasonable and simple structure. The inverter section is isolated from the air duct to prevent dust from entering the inverter area, thus improving reliability. Furthermore, the use of a silicon carbide single-tube inverter increases the operating frequency, enhances static characteristics, and provides a fast dynamic response, resulting in a stable welding arc. The use of a silicon carbide single-tube inverter improves heat dissipation compared to IGBTs, allowing for a smaller heat sink and overall size. This reduces the overall size and cost while maintaining the same current, making mobile operation more convenient. Additionally, the main transformer is suspended below the middle layer plate and placed within the air duct, significantly improving heat dissipation and enhancing reliability. Compared to the ferrite main transformer used in conventional welding machines, this design is smaller and lighter, while increasing the operating frequency and efficiency. This industrial-grade, high-performance, high-duration-rate, high-reliability, energy-efficient, and environmentally friendly welding equipment is capable of welding various metals.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A portable gas shielded welding machine for silicon carbide, characterized in that, Including the casing and internal parts; The casing includes a bottom plate, a front panel, a rear panel, and a middle plate. The middle plate is installed on the upper part, and the bottom plate supports the front panel, the rear panel, the middle plate, and the outer shell. The front panel is equipped with a display board (1) on top. The display board (1) includes a digital display tube (2), a function switch (3), a voltage parameter adjustment knob (4), an inductance adjustment knob (5), and a current adjustment knob (6). The display board (1) is used to display welding parameters, switch functions, and preset parameters. The front panel is symmetrically provided with a positive terminal (7) and a negative terminal (8) of a prefabricated output socket in the middle part. A seven-pin aviation socket (9) is provided between the positive terminal (7) and the negative terminal (8) of the prefabricated output socket. The seven-pin aviation socket (9) is used to connect the motor, air valve, gun switch, and control box of the wire feeder for communication. The front panel is also provided with a vent (10) at the bottom for the air outlet of the air duct. The rear panel is equipped with an air switch (11) for controlling the power supply. The upper left side of the rear panel is provided with a waterproof power cord connector (13). The waterproof power cord connector (13) is used to fix the power cord and reduce the area occupied. The rear panel is also provided with a 36V heater base (12) above and a rear panel vent (14) below. The rear panel vent (14) is provided with a 380V high-speed axial flow fan (15) inside for heat dissipation of internal power devices. An inverter heat sink (28) is provided on the right side of the base plate. The inverter heat sink (28) is mounted on the base plate via a heat sink bracket (29). An inverter plate (26) is provided on the inverter heat sink (28). Eight silicon carbide single tubes (30) and four filter capacitors (31) are provided on the inverter plate (26). The silicon carbide single tubes (30) and filter capacitors (31) are integrated on the inverter plate (26). The inverter and filter sections occupy a small overall space, which allows the machine to be smaller. An absorption plate (27) is provided on the heat sink bracket (29). A three-phase rectifier bridge (25) is also installed on the heat sink (28). A secondary rectifier heat sink (20) is installed on the left side of the base plate. The secondary rectifier heat sink (20) is equipped with four secondary rectifier boards (16). Each secondary rectifier board (16) is equipped with three 80A / 400V fast recovery rectifier tubes, which are used to rectify and output the voltage after the main transformer (23) is stepped down and inverted. The output end of the secondary rectifier heat sink (20) is connected to the positive terminal of the machine's positive output terminal assembly output socket (7) through the output aluminum strip (21). A Hall sensor (22) is connected in series on the output aluminum strip (21) to detect the output current signal and feed it back to the main control board (35). The middle layer board has an adapter board (32) and a power transformer (33) above the rear panel. The adapter board (32) is used to provide AC power to the fan (15) and the power transformer (33). The middle layer board has a drive box (34) on the upper right side. The output end of the drive box is connected to the drive pin of the silicon carbide single tube on the inverter board (26) to drive the silicon carbide single tube. The primary line of the drive box is connected to the main control board (35). The middle layer board has a main control board (35) above the front. The main control board (35) is used to calculate various parameters and output given signals and drive signals to the drive box. The main control board (35) is connected to the display board (1) for data communication. The main control board (35) is connected to the seven-pin aviation socket (9) on the front panel for data communication with the control box of the external wire feeder. A main transformer (23) is installed below the middle layer plate. The main transformer (23) uses a microcrystalline magnetic core. The center tap of the main transformer (23) is connected to the negative terminal (8) of the assembled output socket on the front panel. The two primary wires of the main transformer (23) are connected to the output terminal of the inverter board (26), and the four secondary wires are connected to the left secondary rectifier board (16) respectively. The output is rectified by the secondary rectifier board. The center tap of the main transformer (23) is connected to one end of the output inductor (24) on the bottom plate, and the other end of the output inductor (24) is connected to the negative terminal (8) of the assembled output socket.

2. The portable gas shielded welding machine for silicon carbide according to claim 1, characterized in that, The inverter heat sink (28) is supported by a heat sink bracket (29), which is isolated from the intermediate air duct to reduce the entry of metal dust and improve the reliability of the inverter section.

3. The portable gas shielded welding machine for silicon carbide according to claim 1, characterized in that, The main transformer is suspended and installed below the middle layer plate to enhance heat dissipation.

4. The portable gas shielded welding machine for silicon carbide according to claim 1, characterized in that, The bottom of the base plate is equipped with swivel casters and directional casters for quick movement and positioning of the housing.

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