Inverter welding machine

Abstract

The utility model provides an inverter welder, and belongs to the field of welding equipment. The problem that an existing electric welding machine is short in service life is solved. The inverter welder comprises a shell, a partition plate dividing an inner cavity of the shell into an upper cavity and a lower cavity is horizontally fixed in the shell, an inverter is fixed in the lower cavity, a main control board is horizontally arranged in the upper cavity, and a three-phase input rectifying circuit, an inverter control circuit, an output rectifying circuit and a power control circuit are integrated on the upper side of the main control board. A plurality of copper conducting sheets are further arranged on the main control board, at least part of the copper conducting sheets are electrically connected with the inverter, an insulating box body is further horizontally fixed in the upper cavity, the main control board is located in the insulating box body, and epoxy resin is poured into the insulating box body to seal the main control board; the side wall of the insulation box body is provided with receding openings for the outer ends of the copper guide sheets to extend out, and the receding openings and the copper guide sheets are the same in number and correspond in position one to one. The inverter welder is long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding equipment and relates to an electric welder, in particular to an inverter electric welder. Background Art

[0002] Inverter welding machine, also known as arc welding inverter or inverter arc welding power supply, is a new type of welding power supply. Its working principle is to convert the three-phase industrial frequency AC network voltage into DC power through the input rectifier and filtering, and then invert it into a medium frequency AC voltage of several kHz to tens of kHz through the alternating switching action of high-power switching electronic components.

[0003] Existing inverter welding machines, such as an inverter power supply circuit board and welding machine disclosed in the Chinese Patent Library (Application Number: 201520460517.9), include a main control board and a main inverter board arranged in parallel and electrically connected to each other; the main control board includes a first surface and a second surface opposite to the first surface, and the first surface is provided with an input rectifier circuit, a switching power supply circuit, a PWM pulse width modulation drive circuit and an output feedback circuit connected in sequence; the main inverter board includes a third surface and a fourth surface opposite to the third surface, and the third surface is provided with an insulated gate bipolar transistor, a transformer and an output rectifier circuit.

[0004] In the above-mentioned electric welding machine, the main control board and the main inverter board are directly exposed in the welding machine casing, and the existing casing is basically not fully enclosed, which makes the main control board and the main inverter board susceptible to corrosion by moisture, dust, etc., affecting their lifespan, thereby affecting the lifespan and working performance of the welding machine. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to provide an inverter welding machine with long service life and stable operation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an inverter electric welding machine, comprising a shell, a partition is horizontally fixed in the shell for dividing the inner cavity of the shell into an upper cavity and a lower cavity, an inverter is fixed in the lower cavity, a main control board is horizontally arranged in the upper cavity, a three-phase input rectifier circuit, an inverter control circuit, an output rectifier circuit and a power control circuit are integrated on the upper side of the main control board, a plurality of copper conductors are also arranged on the main control board, and at least some of the copper conductors are electrically connected to the inverter, characterized in that an insulating box body is also horizontally fixed in the upper cavity, and the top of the insulating box body is open and the bottom is closed; the main control board is in the insulating box body, and the main control board is sealed by pouring epoxy resin into the insulating box body; a clearance opening is provided on the side wall of the insulating box body for the outer end of the copper conductor to extend out, and the clearance opening is the same in number as the copper conductor and the positions correspond one to one.

[0007] The main control board with multiple integrated circuits is encapsulated in epoxy resin and isolated from the outside world. This can not only protect the main control board and the connection between the main control board and the electronic components of each circuit, but also achieve good insulation performance, thereby effectively enhancing the life, working stability and performance of the welding machine.

[0008] In the above-mentioned inverter welding machine, the outer end of the above-mentioned copper guide piece is a horizontally arranged connecting piece, so that the copper guide piece can be easily passed through the clearance opening, which is beneficial for assembly.

[0009] In the above-mentioned inverter welding machine, notch grooves are provided on the top surface of the insulating box body, the number of notch grooves and clearance openings is the same, and each clearance opening is connected to the corresponding notch groove. The above-mentioned wiring lug is located in the corresponding notch groove and pressed against the bottom wall of the notch groove, so that the wiring lug is supported upward, making it more stably electrically connected to other circuits or electrical components.

[0010] In the inverter welding machine, a through hole is vertically passed through the terminal lug, and a threaded hole is correspondingly passed through the bottom wall of the notch. In actual use, the terminal is pressed onto the terminal lug and fixed to the terminal lug by screws, further facilitating assembly.

[0011] In the above-mentioned inverter welding machine, a heat dissipation port is vertically penetrated on the partition, and a heat sink is horizontally fixed on the lower side of the partition. The heat sink includes a base plate and a row of fins formed on the base plate. The lower end of the insulating box body passes through the heat dissipation port and is pressed on the base plate to accelerate the heat dissipation inside the insulating box body, make the main control board work more stably, and further enhance the life, working stability and performance of the welding machine.

[0012] In the above inverter welding machine, the heat dissipation port is larger than the insulating box body, and the bottom surface of the insulating box body is completely attached to the base plate to further accelerate the heat dissipation of the insulating box body.

[0013] In the above-mentioned inverter welding machine, the base plate covers the lower side of the heat dissipation opening to accelerate the heat dissipation of the upper cavity.

[0014] In the inverter welding machine described above, a mounting hole is horizontally penetrated on one side of the housing, with the axis of the mounting hole perpendicular to the direction of the fin arrangement. An axial flow fan is installed at the mounting hole, facing the heat sink. Ventilation holes are densely distributed on the other side of the housing. The axial flow fan blowing towards the heat sink further accelerates heat dissipation from the insulating box.

[0015] Compared with the existing technology, this inverter welding machine has the following advantages:

[0016] 1. The main control board with multiple integrated circuits is encapsulated in epoxy resin and isolated from the outside world. This can not only protect the main control board and the connection between the main control board and the electronic components of each circuit, but also achieve good insulation performance, thereby effectively enhancing the life, working stability and performance of the welding machine.

[0017] 2. The lower end of the insulating box body passes through the heat dissipation port and is pressed on the heat sink substrate to accelerate the heat dissipation inside the insulating box body, make the main control board work more stably, and further enhance the life, working stability and performance of the welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the appearance of the inverter welding machine.

[0019] Figure 2 This is the internal schematic diagram of the inverter welding machine.

[0020] Figure 3 It is a connection diagram of the insulating box body and the heat sink.

[0021] In the figure, 1. outer shell; 1a. vent; 2. partition; 2a. heat dissipation vent; 3. upper cavity; 4. lower cavity; 5. inverter; 6. main control board; 6a. copper guide plate; 6a1. terminal block; 7. insulating box; 7a. notch groove; 8. epoxy resin; 9. heat sink; 9a. base plate; 10. axial flow fan; 11. auxiliary control board. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 and Figure 2 As shown, the inverter welding machine includes a housing 1 , in which a partition 2 is horizontally fixed, and the partition 2 divides the inner cavity of the housing 1 into an upper cavity 3 and a lower cavity 4 .

[0024] in,

[0025] An inverter 5 is fixed within the lower chamber 4. A main control board 6 is horizontally mounted within the upper chamber 3. The three-phase input rectifier circuit, inverter control circuit, output rectifier circuit, and power control circuit are integrated on the upper side of the main control board 6. Multiple copper conductors 6a are also arranged on the main control board 6, and at least some of these conductors 6a are electrically connected to the inverter 5. In actual products, the three-phase input rectifier circuit, inverter control circuit, output rectifier circuit, power control circuit, and the connection between the copper conductors 6a and the inverter 5 are all conventional techniques and will not be described in detail here.

[0026] like Figure 2 and Figure 3As shown, an insulating box body 7 is also horizontally fixed within the upper chamber 3. The insulating box body 7 is open at the top and closed at the bottom. The main control board 6 is located within the insulating box body 7 and is sealed by pouring epoxy resin 8 into the insulating box body 7. At this time, some electronic components of the circuit protrude from the epoxy resin 8. The side walls of the insulating box body 7 are provided with clearance openings for the outer ends of the copper guides 6a to extend. The number of clearance openings is the same as the number of copper guides 6a, and their positions correspond one to one.

[0027] The main control board 6 with multiple integrated circuits is encapsulated in epoxy resin 8 and isolated from the outside world, which can not only protect the main control board 6 and the connection between the main control board 6 and the electronic components of each circuit, but also achieve better insulation performance, thereby effectively enhancing the life, working stability and performance of the welding machine.

[0028] The outer end of the copper guide 6a preferably has a horizontally positioned terminal lug 6a1 to facilitate insertion of the copper guide 6a through the clearance opening, facilitating assembly. Further, the top surface of the insulating box body 7 is provided with notched slots 7a. The number of notched slots 7a is the same as the number of clearance openings, and each clearance opening is connected to a corresponding notched slot 7a. The terminal lug 6a1 is positioned within the corresponding notched slot 7a and presses against the bottom wall of the notched slot 7a, providing upward support for the terminal lug 6a1 and ensuring a more stable electrical connection to other circuits or electrical components.

[0029] In this embodiment, a through hole is vertically penetrated on the terminal piece 6a1, and a threaded hole is correspondingly penetrated on the bottom wall of the notch 7a. In actual use, the terminal is pressed on the terminal piece 6a1 and fixed to the terminal piece 6a1 by screws, which further facilitates assembly.

[0030] like Figure 2 and Figure 3 As shown, a heat dissipation port 2a is vertically passed through the partition 2, and a heat sink 9 is horizontally fixed to the lower side of the partition 2. The heat sink 9 includes a base plate 9a and a row of fins formed on the base plate 9a. The lower end of the insulating box body 7 passes through the heat dissipation port 2a and is pressed on the base plate 9a to accelerate the heat dissipation inside the insulating box body 7, so that the main control board 6 can work more stably, and further enhance the life, working stability and performance of the welding machine. Preferably, the heat dissipation port 2a is larger than the insulating box body 7, and the bottom surface of the insulating box body 7 is completely attached to the base plate 9a to further accelerate the heat dissipation of the insulating box body 7. The base plate 9a covers the lower side of the heat dissipation port 2a to accelerate the heat dissipation of the upper cavity 3. In the actual product, the insulating box body 7 is fixed to the base plate 9a by screws.

[0031] Furthermore, a mounting hole is horizontally formed through one side of the housing 1, with the axis of the mounting hole perpendicular to the fin arrangement. An axial flow fan 10 is positioned at the mounting hole, facing the heat sink 9. Ventilation openings 1a are densely distributed on the other side of the housing 1. The axial flow fan 10 blows air toward the heat sink 9, further accelerating heat dissipation from the insulating box 7.

[0032] In the actual product, a sub-control board 11 is horizontally provided above the main control board 6. The sub-control board 11 integrates an external filtering circuit and a high-frequency absorption circuit, and the sub-circuit board is fixed to the corresponding terminal piece 6a1 by copper guide pillars.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An inverter welding machine, comprising a housing (1), a partition (2) being fixed horizontally in the housing (1) for dividing the inner cavity of the housing (1) into an upper cavity (3) and a lower cavity (4), an inverter (5) being fixed in the lower cavity (4), a main control board (6) being arranged horizontally in the upper cavity (3), a three-phase input rectifier circuit, an inverter control circuit, an output rectifier circuit and a power control circuit being integrated on the upper side of the main control board (6), a plurality of copper conductors (6a) being arranged on the main control board (6), and at least some of the copper conductors (6a) being electrically connected to the inverter (5), characterized in that: An insulating box body (7) is also horizontally fixed in the upper cavity (3), and the top of the insulating box body (7) is open and the bottom is closed; the main control board (6) is located in the insulating box body (7), and the main control board (6) is sealed by pouring epoxy resin (8) into the insulating box body (7); a clearance opening for the outer end of the copper guide piece (6a) to extend is provided on the side wall of the insulating box body (7), and the clearance opening and the copper guide piece (6a) are the same in number and have a one-to-one corresponding position.

2. The inverter welding machine according to claim 1, characterized in that: The outer end of the copper guide piece (6a) is a horizontally arranged connecting piece (6a1).

3. The inverter welding machine according to claim 2, characterized in that: A notch groove (7a) is provided on the top surface of the insulating box body (7), the notch grooves (7a) and the clearance openings are the same in number, and each clearance opening is connected to a corresponding notch groove (7a), and the wiring piece (6a1) is located in the corresponding notch groove (7a) and pressed against the bottom wall of the notch groove (7a).

4. The inverter welding machine according to claim 3, characterized in that: A through hole is vertically passed through the wiring piece (6a1), and a threaded hole is correspondingly passed through the bottom wall of the notch groove (7a).

5. The inverter welding machine according to claim 1, characterized in that: A heat dissipation opening (2a) is vertically passed through the partition (2), a heat dissipation fin (9) is horizontally fixed to the lower side of the partition (2), the heat dissipation fin (9) comprises a base plate (9a) and a row of fins formed on the base plate (9a), and the lower end of the insulating box body (7) passes through the heat dissipation opening (2a) and is pressed onto the base plate (9a).

6. The inverter welding machine according to claim 5, characterized in that: The heat dissipation opening (2a) is larger than the insulating box body (7), and the bottom surface of the insulating box body (7) is completely attached to the base plate (9a).

7. The inverter welding machine according to claim 6, characterized in that: The base plate (9a) covers the lower side of the heat dissipation opening (2a).

8. The inverter welding machine according to claim 5, 6 or 7, characterized in that: A mounting hole is horizontally passed through one side of the housing (1), and the axial direction of the mounting hole is perpendicular to the fin arrangement direction. An axial flow fan (10) facing the heat sink (9) is provided at the mounting hole, and ventilation openings (1a) are densely distributed on the other side of the housing (1).

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