An air plasma welding machine

Abstract

This utility model discloses an air plasma welding machine, relating to the field of welding equipment. It includes a fixed housing and a cover, with the fixed housing and cover forming an installation area. The installation area houses an IGBT inverter module, a secondary rectifier module, a filter capacitor, and an air compressor. It also includes a mounting plate, horizontally positioned within the fixed housing, dividing the installation area into an upper chamber and a lower chamber. The upper chamber houses the IGBT inverter module and the filter capacitor, while the lower chamber houses the secondary rectifier module and the air compressor. A heat dissipation structure is located on one side of the fixed housing, enabling heat dissipation from the lower chamber. This air plasma welding machine places the IGBT inverter module in the upper chamber, isolating it from the airflow channels of the heat dissipation structure, preventing dust from being drawn into the IGBT inverter module during operation, thus avoiding damage and extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment, specifically an air plasma welding machine. Background Technology

[0002] Air plasma welding machines are widely used in metal cutting and welding operations due to their advantages such as concentrated energy, high welding efficiency, and good weld quality. Among the core components of air plasma welding machines, the IGBT inverter module is the key component for realizing power conversion. It generates a lot of heat during operation, and at the same time, due to the power conversion requirements, the IGBT inverter module needs to maintain a high-voltage operating state.

[0003] To ensure the stable operation of IGBT inverter modules, existing air plasma welding machines are typically equipped with fans for cooling. However, in actual use, the cooling fans draw dust and other impurities from the external environment into the welding machine. Since the IGBT inverter module operates under high voltage, the drawn-in dust easily adheres to its surface and pins. This reduces heat dissipation efficiency, causing the module temperature to rise continuously. Furthermore, the unstable insulation properties of dust can easily lead to leakage, short circuits, and other faults under high voltage conditions, potentially damaging the IGBT inverter module directly. This not only increases equipment maintenance costs but also affects the continuity of welding operations. Utility Model Content

[0004] The purpose of this invention is to provide an air plasma welding machine that places the IGBT inverter module in the upper chamber, isolating it from the airflow channel of the heat dissipation structure, thereby preventing dust from being drawn into the IGBT inverter module during operation, which could damage the IGBT inverter module and extend its service life.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: an air plasma welding machine, including a fixed shell and a cover, wherein the fixed shell and the cover form an installation area, and an IGBT inverter module, a secondary rectifier module, a filter capacitor and an air compressor are provided in the installation area; It also includes a mounting plate, which is horizontally disposed inside the fixed shell and divides the mounting area into an upper chamber and a lower chamber. The upper chamber is provided with the IGBT inverter module and the filter capacitor, and the lower chamber is provided with the secondary rectifier module and the air compressor. A heat dissipation structure is provided on one side of the fixed shell to achieve heat dissipation of the lower chamber.

[0006] In some embodiments, a partition plate is further included, which is vertically disposed between the mounting plate and the fixed shell and divides the lower chamber into a first mounting area and a second mounting area. The secondary rectifier module is disposed in the first mounting area and the air compressor is disposed in the second mounting area.

[0007] In some embodiments, the heat dissipation structure includes a first cooling fan, which is disposed in the second mounting area; The second cooling fan is located in the first installation area, and the airflow range of the second cooling fan covers the secondary rectifier module. Multiple air inlets are provided, which penetrate the fixed housing on the side away from the first cooling fan and communicate with the lower chamber.

[0008] In some embodiments, the heat dissipation structure further includes a plurality of first heat sinks, which are disposed between the secondary rectifier module and the isolation plate, and the airflow range of the second cooling fan covers the secondary rectifier module and the plurality of first heat sinks.

[0009] In some embodiments, the heat dissipation structure further includes a third cooling fan, which is disposed in the first mounting area and above the second cooling fan; Multiple second heat sinks are disposed at the bottom of the IGBT inverter module, and their bottoms penetrate the mounting plate and extend into the airflow range of the third cooling fan.

[0010] In some embodiments, a gap is left between the plurality of second heat sinks and the secondary rectifier module.

[0011] In some embodiments, the heat dissipation structure further includes a plurality of air guide vanes, which are inclined upwards at the air inlet.

[0012] In some embodiments, an air pressure switch is also included, which is disposed on the fixed housing and in the upper cavity.

[0013] In summary, this utility model has the following beneficial effects: This invention utilizes a layered design of the mounting plate to place the IGBT inverter module in the upper chamber and employs a second heat sink for indirect heat dissipation, avoiding direct contact with external airflow. This effectively prevents dust from adhering to the surface of the IGBT inverter module, avoids leakage and short-circuit faults under high-voltage conditions, and extends the service life of the IGBT inverter module. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention with the cover removed; Figure 2 This is a structural schematic diagram of the present invention with the cover removed from another perspective.

[0015] In the diagram: 1. Fixed housing; 2. Mounting plate; 3. IGBT inverter module; 4. Secondary rectifier module; 5. Filter capacitor; 6. Air compressor; 7. Heat dissipation structure; 71. First cooling fan; 72. Second cooling fan; 73. First heat sink; 74. Third cooling fan; 75. Air inlet; 76. Air guide plate; 77. Second heat sink; 8. Isolation plate; 9. Air compressor switch. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] refer to Figure 1-2 An air plasma welding machine includes a fixed shell 1 and a cover (not shown). The fixed shell 1 and the cover can be connected by bolts to form an installation area. An IGBT inverter module 3, a secondary rectifier module 4, a filter capacitor 5, and an air compressor 6 are integrated in the installation area. The components are connected by wires to form the core working unit of the air plasma welding machine. The specific working principle of the air plasma welding machine is existing technology and will not be described in detail here. Mounting plate 2 can be horizontally fixed to the inner wall of fixed shell 1 with bolts. The edge of mounting plate 2 is sealed and fitted to the inner wall of fixed shell 1, which can divide the installation area into an independent upper chamber and a lower chamber. The upper chamber can be fixed with IGBT inverter module 3 and filter capacitor 5 with bolts, while the lower chamber is fixed with secondary rectifier module 4 and air compressor 6. Through the partitioning design of mounting plate 2, dust carried by the heat dissipation airflow in the lower chamber can be prevented from entering the upper chamber and contacting IGBT inverter module 3, avoiding leakage and short circuit faults under high pressure environment, and extending the service life of IGBT inverter module 3. The heat dissipation structure 7 is located on one side of fixed shell 1 and is connected to the lower chamber. It can achieve efficient heat dissipation of the lower chamber through directional airflow circulation, while preventing the heat dissipation airflow from directly contacting IGBT inverter module 3 in the upper chamber.

[0018] In some embodiments, the system further includes an isolation plate 8, which is vertically fixed between the bottom of the mounting plate 2 and the bottom of the fixed shell 1. The two sides of the isolation plate 8 are respectively sealed and fitted to the inner wall of the fixed shell 1, dividing the lower chamber into two independent installation areas: a first installation area and a second installation area. The secondary rectifier module 4 can be fixed in the first installation area by bolts and brackets, and the air compressor 6 can be fixed in the second installation area by bolts. The isolation plate 8 can prevent mutual interference of the heat dissipation airflow in the first installation area and the second installation area, and provide independent space for subsequent partitioned heat dissipation.

[0019] In some embodiments, the heat dissipation structure 7 includes a first cooling fan 71, a second cooling fan 72, and multiple air inlets 75. The first cooling fan 71 can be fixed to the side wall of the fixed housing 1 corresponding to the second mounting area by bolts, and the air outlet direction of the first cooling fan 71 is towards the surface of the air compressor 6, which can provide directional airflow for heat dissipation of the air compressor 6. The second cooling fan 72 can be fixed to the side wall of the fixed housing 1 corresponding to the first mounting area by bolts, and the air outlet direction of the second cooling fan 72 is towards the secondary rectifier module 4. The airflow range of the second cooling fan 72 completely covers the surface of the secondary rectifier module 4, achieving precise heat dissipation of the secondary rectifier module 4. Multiple air inlets 75 are evenly distributed through the side wall of the fixed housing 1 on the side away from the first cooling fan 71, and are respectively connected to the first mounting area and the second mounting area, serving as the inlet of heat dissipation airflow to ensure that both mounting areas can obtain sufficient cooling airflow.

[0020] In some embodiments, the heat dissipation structure 7 further includes a plurality of first heat sinks 73, which are fixed to the side of the secondary rectifier module 4 near the isolation plate 8 by thermally conductive adhesive, and the plurality of first heat sinks 73 are arranged at uniform intervals. The airflow range of the second cooling fan 72 simultaneously covers the surface of the secondary rectifier module 4 and the plurality of first heat sinks 73. The first heat sinks 73 may adopt an aluminum corrugated structure, which can increase the heat dissipation area and quickly absorb the heat generated by the secondary rectifier module 4. With the directional airflow of the second cooling fan 72, the heat can be quickly dissipated.

[0021] In some embodiments, the heat dissipation structure 7 further includes a third heat dissipation fan 74 and a plurality of second heat sinks 77. The third heat dissipation fan 74 can be fixed to the side wall of the mounting shell 1 corresponding to the first mounting area by bolts and is located directly above the second heat dissipation fan 72. The air outlet direction of the third heat dissipation fan 74 is consistent with the air outlet direction of the second heat dissipation fan 72. The plurality of second heat sinks 77 can be fixed to the bottom of the IGBT inverter module 3 by adhesive bonding. The mounting plate 2 has through holes adapted to the second heat sinks 77. The bottom of the second heat sinks 77 passes through the through holes and extends into the airflow range of the third heat dissipation fan 74. The heat generated by the IGBT inverter module 3 is transferred to the lower chamber through the second heat sinks 77, and the heat is then carried away by the directional airflow of the third heat dissipation fan 74, thereby achieving indirect heat dissipation of the IGBT inverter module 3. This avoids direct contact with the external heat dissipation airflow and prevents leakage and short circuit faults caused by dust adsorbed in the heat dissipation airflow under high pressure, thus extending the service life of the IGBT inverter module 3.

[0022] In some embodiments, a gap of 10-15mm is left between the plurality of second heat sinks 77 and the secondary rectifier module 4. This gap can provide a flow channel for the airflow of the third cooling fan 74, ensuring that the cooling airflow can flow smoothly over the surface of the second heat sinks 77 and improve the cooling efficiency.

[0023] In some embodiments, the heat dissipation structure 7 further includes a plurality of guide vanes 76, which are inclined upward at an angle of 15°-30° and can be welded and fixed inside each air inlet 75. The guide vanes 76 can guide the external airflow into the lower chamber along the inclined direction, avoiding the airflow from directly impacting the dust accumulated at the bottom of the lower chamber and causing dust to rise. At the same time, the inclined structure can block some large particulate impurities (such as metal shavings and dust clumps) from entering with the airflow, playing a preliminary filtering role. In addition, it can also prevent rainwater and other liquids from seeping into the equipment through the air inlet 75, providing protection for subsequent dust prevention and airflow guidance.

[0024] In some embodiments, an air compressor switch 9 is also included. The air compressor switch 9 can be fixed to the side wall of the fixed housing 1 by bolts and embedded in the upper cavity. The air compressor switch 9 is electrically connected to the air compressor 6 through a wire. The operation of the air compressor 6 can be controlled according to the start and stop status of the welding operation to avoid the air compressor 6 running idle and generating excess heat and dust disturbance.

[0025] The specific working principle is as follows: When the device is started, the first cooling fan 71, the second cooling fan 72, and the third cooling fan 74 operate synchronously, and external airflow enters the lower chamber through the air inlet 75. The upward-sloping guide vanes 76 at the air inlet 75 first guide the airflow, preventing it from directly impacting the dust accumulated at the bottom of the lower chamber, reducing dust, and at the same time blocking large particles of impurities from entering, thus initially filtering the airflow.

[0026] The first cooling fan 71 generates negative pressure, guiding the airflow, which has been preliminarily filtered by the guide plate 76, to flow over the surface of the air compressor 6, carrying away the heat generated by the air compressor 6 during operation, and dissipating it through the first cooling fan 71, thus completing the heat dissipation of the air compressor 6. Moreover, this cooling airflow is restricted by the isolation plate 8 in the second installation area, preventing it from mixing with the airflow in the first installation area. Similarly, the second cooling fan 72 operates, guiding the airflow through the secondary rectifier module 4 and the first heat sink 73. The corrugated structure of the first heat sink 73 increases the heat dissipation area, quickly absorbing and transferring the heat from the secondary rectifier module 4. The airflow carries the heat out, completing the heat dissipation cycle of the secondary rectifier module 4.

[0027] The heat generated by the IGBT inverter module 3 is transferred to the lower chamber through the second heat sink 77 at the bottom, which penetrates the mounting plate 2. The third cooling fan 74 is located above the second cooling fan 72, and the airflow generated by its operation directly acts on the second heat sink 77 extending into the lower chamber, quickly carrying away heat and achieving indirect heat dissipation for the IGBT inverter module 3. During this process, the IGBT inverter module 3 remains in the upper chamber and does not directly contact the external airflow. At the same time, the 10-15mm gap between the second heat sink 77 and the secondary rectifier module 4 prevents dust carried by the airflow around the secondary rectifier module 4 from directly contacting the second heat sink 77, further preventing dust from being transferred to the upper chamber through the second heat sink 77.

[0028] The airflow in the entire heat dissipation cycle is always confined to the lower chamber. The upper chamber only transfers heat through the second heat sink 77, without a direct air intake channel. This fundamentally reduces the possibility of dust entering the upper chamber and adhering to the surface of the IGBT inverter module 3.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An air plasma welding machine, comprising a fixed housing (1) and a cover, wherein the fixed housing (1) and the cover form an installation area, and wherein an IGBT inverter module (3), a secondary rectifier module (4), a filter capacitor (5), and an air compressor (6) are disposed in the installation area; characterized in that: It also includes a mounting plate (2), which is horizontally disposed in the fixed shell (1) and divides the mounting area into an upper chamber and a lower chamber. The upper chamber is provided with the IGBT inverter module (3) and the filter capacitor (5), and the lower chamber is provided with the secondary rectifier module (4) and the air compressor (6). The heat dissipation structure (7) is located on one side of the fixed shell (1) and can dissipate heat from the lower chamber.

2. An air plasma welding machine according to claim 1, characterized in that: It also includes an isolation plate (8), which is vertically disposed between the mounting plate (2) and the fixed shell (1) and divides the lower chamber into a first installation area and a second installation area. The secondary rectifier module (4) is provided in the first installation area, and the air compressor (6) is provided in the second installation area.

3. An air plasma welding machine according to claim 2, characterized in that: The heat dissipation structure (7) includes a first heat dissipation fan (71), which is located in the second installation area; The second cooling fan (72) is located in the first installation area, and the airflow range of the second cooling fan (72) covers the secondary rectifier module (4). Multiple air inlets (75) penetrate the fixed housing (1) on the side away from the first cooling fan (71) and communicate with the lower chamber.

4. An air plasma welding machine according to claim 3, characterized in that: The heat dissipation structure (7) further includes a plurality of first heat sinks (73), which are disposed between the secondary rectifier module (4) and the isolation plate (8), and the airflow range of the second cooling fan (72) covers the secondary rectifier module (4) and the plurality of first heat sinks (73).

5. An air plasma welding machine according to claim 3, characterized in that: The heat dissipation structure (7) further includes a third heat dissipation fan (74), which is located in the first installation area and above the second heat dissipation fan (72); Multiple second heat sinks (77) are disposed at the bottom of the IGBT inverter module (3), and their bottoms penetrate the mounting plate (2) and extend to the airflow range of the third cooling fan (74).

6. An air plasma welding machine according to claim 5, characterized in that: There is a gap between the multiple second heat sinks (77) and the secondary rectifier module (4).

7. An air plasma welding machine according to claim 3, characterized in that: The heat dissipation structure (7) also includes multiple air guide vanes (76), which are inclined upwards at the air inlet (75).

8. An air plasma welding machine according to claim 1, characterized in that: It also includes an air pressure switch (9), which is mounted on the fixed housing (1) and located in the upper cavity.

Images