Small metal heating device

Abstract

The utility model provides a small metal heating device, and belongs to the technical field of induction heating. Comprising an induction coil fixedly connected with one end of a shell, and a circuit board, a water-cooling heat dissipation plate and a water-cooling pipeline which are all arranged in the shell, two ends of the induction coil are electrically connected with the circuit board; the water-cooling heat dissipation plate and the induction coil are connected in series in the water-cooling pipeline; a rectifier bridge, a first power transistor, a second power transistor and a driving chip are arranged on the circuit board; the driving chip is used for generating a high-frequency driving signal; the first power transistor and the second power transistor are used for being periodically switched on and switched off under the driving of the high-frequency driving signal, so that high-frequency alternating current is generated on the induction coil; the rectifier bridge, the first power transistor and the second power transistor are all attached to the water-cooling heat dissipation plate. According to the utility model, heat dissipation of elements such as transistors can be realized in a water cooling manner.

Description

Technical Field

[0001] The utility model belongs to the technical field of induction heating, and particularly relates to a small metal heating device. Background Art

[0002] High-frequency induction heating equipment utilizes the principle of electromagnetic induction. High-frequency current flows through a wound heating coil, and a strong magnetic flux with instantaneous polarity change is generated inside the coil. When a metal or other material to be heated is placed inside the coil, the magnetic flux will penetrate the entire material to be heated, and a large eddy current will be generated in the direction opposite to the heating current inside the material to be heated. Due to the Joule heat generated by the resistance in the material to be heated, the temperature of the material itself rises rapidly.

[0003] The high-frequency current of high-frequency induction heating equipment is generated by the high-frequency on-off of switching elements in the circuit. A large amount of heat is generated when the switching elements are working and needs to be dissipated in time. Currently, most high-frequency induction heating equipment uses air cooling to dissipate heat from the switching elements, and the heat dissipation effect is not good. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a small metal heating device that can dissipate heat from the switching elements by means of water cooling in view of the deficiencies of the prior art.

[0005] To solve one or part or all of the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] A small metal heating device includes a housing, an induction coil fixedly connected to one end of the housing, and a circuit board, a water-cooled heat dissipation plate, and a water-cooled pipeline all arranged inside the housing; both ends of the induction coil are electrically connected to the circuit board; the induction coil is wound by a hollow copper pipe, and the water-cooled heat dissipation plate and the induction coil are both connected in series in the water-cooled pipeline; a rectifier bridge, a first power transistor, a second power transistor, and a driving chip are arranged on the circuit board; the driving chip is used to generate a high-frequency driving signal; the first power transistor and the second power transistor are used to conduct and turn off periodically under the drive of the high-frequency driving signal, so that a high-frequency alternating current is generated on the induction coil; the rectifier bridge, the first power transistor, and the second power transistor are all attached to the water-cooled heat dissipation plate.

[0007] Further, one end of the housing is a first side plate for fixing the induction coil, and the other end is a second side plate; the first side plate is made of insulating material, and the other side plates of the housing except the first side plate are made of metal material; both the water inlet and the water outlet of the water-cooled pipeline are made of metal material and are both fixedly connected to the second side plate.

[0008] Further, a voltage and current meter and a power supply connection socket are also provided on the second side plate; the power supply connection socket is used to connect an external AC power supply and is electrically connected to the circuit board; the grounding end of the power supply connection socket is electrically connected to the metal part of the housing; the voltage test line of the voltage and current meter is electrically connected to the power supply connection socket; the mutual inductance coil of the current test line of the voltage and current meter is sleeved on the power supply line connecting the power supply connection socket and the circuit board.

[0009] Further, a start-stop button electrically connected to the circuit board is also provided on the second side plate.

[0010] Further, a cooling fan is provided inside the upper side plate of the housing, and the cooling fan is electrically connected to the circuit board.

[0011] Further, a handle is fixedly provided on the upper part of the housing.

[0012] Further, both the first power transistor and the second power transistor are IGBT transistors.

[0013] Further, a resonant capacitor connected in series or parallel with the induction coil is also provided on the circuit board.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] A water-cooled heat dissipation plate and a water-cooled pipeline are provided inside the housing of the present utility model. The water-cooled pipeline is communicated with an external circulating water source. The water-cooled heat dissipation plate is connected in series in the water-cooled pipeline. At the same time, the water-cooled heat dissipation plate is made of copper or aluminum. The rectifier bridge, the first power transistor and the second power transistor in the device circuit are all fixedly attached to the water-cooled heat dissipation plate. Therefore, the present utility model can use the water-cooled method to dissipate heat from the rectifier bridge, the first power transistor and the second power transistor.

[0016] The water-cooled pipeline of the present utility model is made of an insulating material. The water inlet and outlet of the water-cooled pipeline are both made of metal, and the water inlet and outlet are both electrically connected to the metal part of the housing. When the housing is grounded, electric leakage caused by circulating water can be avoided, ensuring safety.

[0017] The present utility model can heat metal materials and can heat, melt or weld metal materials such as gold, silver, copper, and aluminum. The structure of the present utility model is small and compact, and it can be conveniently lifted and moved by using the handle. Description of the Drawings

[0018] The following further describes the present utility model in detail with reference to the drawings.

[0019] Figure 1 : Structural schematic diagram of Embodiment 1 of the present utility model;

[0020] Figure 2 : One of the internal structural diagrams of Embodiment 1 of the present utility model;

[0021] Figure 3 : Another internal structural diagram of Embodiment 1 of the present utility model;

[0022] Figure 4 : Circuit schematic diagram of Embodiment 2 of the present utility model;

[0023] Figure 5 : Circuit schematic diagram of Embodiment 3 of the present utility model;

[0024] Wherein: 1 - housing, 11 - first side plate, 12 - second side plate, 13 - handle, 14 - ventilation window, 2 - induction coil, 3 - circuit board, 31 - rectifier bridge, 32 - first power transistor, 33 - second power transistor, 34 - drive chip, 4 - water-cooled heat sink, 5 - water-cooled pipeline, 51 - water inlet, 52 - water outlet, 6 - voltage and current meter, 7 - power connection socket, 8 - cooling fan, 9 - start-stop button. Detailed implementation manners

[0025] To better understand the present utility model, the content of the present utility model will be further clearly elaborated below in conjunction with embodiments and drawings. However, the protected content of the present utility model is not limited to the following embodiments. In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details.

[0026] Embodiment 1: Refer to Figures 1 - 3 , the purpose of this embodiment is to provide a small metal heating device. It includes a housing 1, an induction coil 2 arranged outside the end of the housing 1, and a circuit board 3 arranged inside the housing 1.

[0027] The housing 1 is in the shape of a rectangular box, with the side plate at one end being the first side plate 11 and the side plate at the other end being the second side plate 12. A handle 13 is fixedly arranged on the top of the housing 1.

[0028] The induction coil 2 is in a cylindrical shape and is wound by a hollow copper tube. After the two ends of the induction coil 2 are fixedly connected to the first side plate 11, they both extend into the housing 1. The two ends of the induction coil 2 are electrically connected to the circuit board 3.

[0029] On the circuit board 3, a rectifier bridge 31, a first power transistor 32, a second power transistor 33, and a drive chip 34 are electrically connected; the first power transistor 32 and the second power transistor 33 are arranged in parallel, and both the first power transistor 32 and the second power transistor 33 are connected in series between the rectifier bridge 31 and the induction coil 2; both the first power transistor 32 and the second power transistor 33 are electrically connected to the drive chip 34. The rectifier bridge 31 is used to convert the AC input into DC, the drive chip 34 is used to generate high-frequency drive signals, and the first power transistor 32 and the second power transistor 33 are used to conduct and turn off periodically under the control of the drive signals of the drive chip 34 to generate high-frequency alternating current; the first power transistor 32 and the second power transistor 33 are respectively connected in series between the rectifier bridge 31 and the induction coil 2 to generate high-frequency alternating current; the induction coil 2 uses the alternating current to generate a high-frequency alternating magnetic field. When the metal material to be heated is placed inside the induction coil 2, the change of the magnetic field will generate eddy currents on the material to be heated, and these eddy currents will generate significant Joule heat due to the resistance of the material itself, thus realizing heating.

[0030] Inside the housing 1, a water-cooled heat dissipation plate 4 and a water-cooled pipeline 5 are also provided; the water-cooled pipeline 5 is made of insulating material and is used to connect the water-cooled heat dissipation plate 4 and the induction coil 2; the water-cooled heat dissipation plate 4 is made of copper or aluminum and is provided with a water circulation channel inside. The water inlet 51 and the water outlet 52 of the water-cooled pipeline 5 are both arranged on the second side plate 12, and the water inlet 51 is used to connect to the external circulating water source. Starting from the water inlet 51, the water-cooled pipeline 5 sequentially connects the water-cooled heat dissipation plate 4 and the induction coil 2 in series, that is, after the external cooling water flows in from the water inlet 51, it first flows through the inside of the water-cooled heat dissipation plate 4 to cool the water-cooled heat dissipation plate 4, and then flows through the inside of the copper pipe of the induction coil 2 to cool the induction coil 2 itself, and finally flows out from the water outlet 52. The water-cooled heat dissipation plate 4 is arranged beside the circuit board 3, and the rectifier bridge 31, the first power transistor 32, and the second power transistor 33 are all fixedly attached to the water-cooled heat dissipation plate 4.

[0031] On the second side plate 12, a voltage and ammeter 6 and a power supply connection socket 7 are also provided. The voltage and ammeter 6 is used to display the voltage value of the AC power supply and the working current value of the heating device, and the power supply connection socket 7 is used to connect to the external 220V AC power supply. The power supply connection socket 7 is internally provided with a switch and is electrically connected to the circuit board 3 at the same time to supply power to the circuit board 3. The voltage test wire of the voltage and ammeter 6 is electrically connected to the power supply connection socket 7, and the mutual inductance coil connected by the current test wire is sleeved on a power supply wire connecting the power supply connection socket 7 and the circuit board 3.

[0032] The first side plate 11 is made of insulating material, and the other parts of the housing 1 except the first side plate 11 are made of metal. At the same time, the grounding pin of the power connection socket 7 is electrically connected to the metal part of the housing 1. Both the water inlet 51 and the water outlet 52 are made of metal, so that the water inside the water cooling pipe 5 can be grounded through the housing 1 to ensure safety.

[0033] A cooling fan 8 is also arranged inside the housing 1, and the cooling fan 8 is located above the circuit board 3; the cooling fan 8 is either fixedly arranged on the lower side of the upper side plate of the housing 1 or fixedly arranged on the circuit board 3; a ventilation window 14 is arranged on the upper side of the housing 1, and the ventilation window 14 is located above the cooling fan 8. Preferably, the cooling fan 8 is fixed on the upper side plate of the housing 1, so that the cooling fan 8 can completely fit and cover the ventilation window 14. At the same time, ventilation holes are also arranged at the lower part of the housing 1. For example, the ventilation holes in the attached drawings are located at the lower parts of the front and rear sides of the housing 1. The cooling fan 8 is electrically connected to the circuit board 3. A power module is arranged on the circuit board 3, and the power module is used to provide DC power supply for the driving chip 34 and the cooling fan 8.

[0034] A start-stop button 9 is also arranged on the second side plate 12, and the start-stop button 9 is electrically connected to the circuit board 3. When the driving chip 34 receives the start signal of the start-stop button 9, it starts to send out high-frequency driving signals, so that the heating device starts to heat; when the driving chip 34 receives the stop signal of the start-stop button 9, the start-stop button 9 stops sending out high-frequency driving signals, and the heating device stops heating.

[0035] Both the first power transistor 32 and the second power transistor 33 are MOSFET transistors or IGBT transistors, and preferably IGBT transistors. The model of the driving chip 34 is SG3525A.

[0036] Embodiment 2: Refer to Figure 4 , the small metal heating device provided in this embodiment has the following main improvements compared with Embodiment 1: The circuit schematic diagram of the circuit board 3 is as shown in Figure 4 .

[0037] Figure 4 In [the figure], D1 is the rectifier bridge 31, Q1 is the first power transistor 32, Q2 is the second power transistor 33, U1 is the driving chip 34, L2 is the induction coil 2, and C3 is the resonant capacitor. Among them, Q1 and Q2 are arranged in parallel to improve the current-carrying capacity; both Q1 and Q2 are electrically connected to U1 and can be turned on under the drive of U1.

[0038] Q1, Q2, C3 and L2 together form a resonant circuit. When Q1 and Q2 are periodically turned on and off according to the high-frequency driving signal of U1, L2 generates a high-frequency alternating magnetic field to realize the heating of the metal material.

[0039] Embodiment 3: Refer toFigure 5 , the small metal heating device provided in this embodiment has mainly made the following improvements compared with Embodiment 1: The circuit schematic diagram of the circuit board 3 is as Figure 5 shown.

[0040] Figure 5 In [Figure], D2 is the rectifier bridge 31, Q3 is the first power transistor 32, Q4 is the second power transistor 33, U2 is the drive chip 34, L4 is the induction coil 2, and C6 and C7 are the resonant capacitors. Both Q3 and Q4 are electrically connected to U2 and can be turned on under the drive of U2.

[0041] Q3, Q4, C6, C7, and L4 together form a resonant circuit. When Q3 and Q4 are periodically turned on and off alternately according to the high-frequency drive signal of U2, L4 generates a high-frequency alternating magnetic field to achieve heating of the metal material.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall be covered by the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A small metal heating device, characterized in that: It includes a shell, an induction coil fixedly connected to one end of the shell, and a circuit board, a water-cooled heat sink and a water-cooled pipeline all arranged in the shell; Two ends of the induction coil are electrically connected to the circuit board; The induction coil is wound by a hollow copper tube, and the water-cooled heat sink and the induction coil are connected in series in the water-cooling pipeline; The circuit board is provided with a rectifier bridge, a first power transistor, a second power transistor and a driving chip; the driving chip is used to generate a high-frequency driving signal; the first power transistor and the second power transistor are used to be periodically turned on and off under the drive of the high-frequency driving signal, so that a high-frequency alternating current is generated on the induction coil; The rectifier bridge, the first power transistor and the second power transistor are all attached to the water-cooled heat sink.

2. The small metal heating device according to claim 1, characterized in that: One end of the shell is a first side plate for fixing the induction coil, and the other end is a second side plate; the first side plate is made of insulating material, and the other side plates of the shell except the first side plate are made of metal; The water inlet and the water outlet of the water cooling pipeline are both made of metal and are fixedly connected to the second side plate.

3. The small metal heating device according to claim 2, characterized in that: The second side panel is also provided with a voltage and current meter and a power connection socket; The power connection socket is used to connect an external AC power source and is electrically connected to the circuit board; The ground terminal of the power connection socket is electrically connected to the metal part of the shell; The voltage test line of the voltage and current meter is electrically connected to the power connection socket; The mutual inductance coil of the current test line of the voltage and current meter is sleeved on the power line connecting the power connection socket and the circuit board.

4. The small metal heating device according to claim 2, characterized in that: The second side panel is also provided with a start / stop button electrically connected to the circuit board.

5. The small metal heating device according to claim 1, characterized in that: A heat dissipation fan is arranged in the upper side plate of the shell, and the heat dissipation fan is electrically connected to the circuit board.

6. The small metal heating device according to claim 1, characterized in that: A handle is fixedly arranged on the upper part of the shell.

7. The small metal heating device according to claim 1, characterized in that: The first power transistor and the second power transistor are both IGBT transistors.

8. The small metal heating device according to claim 1, characterized in that: The circuit board is also provided with a resonant capacitor connected in series or in parallel with the induction coil.

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