CN106312219A - Welding device and welding method for heat pipe radiator - Google Patents

Abstract

The invention relates to the technical field of radiators, in particular to a welding device and a welding method for a heat pipe radiator. The welding device includes a positioning jig, a coil and an upper cover, and the positioning jig has a heat conduction block positioning groove, a heat pipe positioning groove and a heat dissipation fin positioning groove for respectively positioning the heat conduction block, heat pipe and heat dissipation fin; The ferrite magnetic core is wound with multiple turns of enamelled copper wire, and the coil is fixed on the lower side of the upper cover. When welding the heat pipe radiator, the upper cover covers the heat pipe radiator to be welded on the positioning fixture. The pulse power generator provides high-frequency voltage to the coil, so that the coil generates a magnetic field changing at a high speed. When the magnetic force line in the magnetic field passes through the heat conduction block, heat pipe, heat dissipation fin and solder paste to be welded, countless small The eddy current makes the metal to be welded heat itself at a high speed, and cools down after reaching a certain temperature to achieve the purpose of welding the heat pipe radiator. The invention has rapid heating, easy operation and low cost.

Description

A kind of welding device and welding method of heat pipe radiator

technical field

The invention relates to the technical field of radiators, in particular to a welding device and a welding method for a heat pipe radiator.

Background technique

Heat pipe radiators have been widely used in various occasions that require heat dissipation due to the advantages of heat pipes such as high thermal conductivity, light weight, simple structure, low price, and the ability to transfer a large amount of heat without electricity. For example, the rapid conduction and heat dissipation of integrated devices with high heat generation such as electronic heating components such as CPU can effectively reduce the heat accumulation caused by the heating of electronic heating components and ensure the normal operation of electronic components. Referring to Fig. 1, the heat pipe radiator includes a heat conducting block 1, a heat pipe 2 and a heat dissipation fin 3, and a welding groove is arranged on the heat dissipation fin 3, and one end of the heat pipe 2 is welded in the welding groove of the heat dissipation fin 3, and the heat pipe 2 The other end of the heat pipe 2 is welded on the heat conducting block 1, the end connecting the heat pipe 2 and the heat conducting block 1 is called the evaporation end, and the end connecting the heat pipe 2 and the cooling fin 3 is called the condensation end. The heat conduction block 1 is in close contact with the electronic heating element, and the heat from the evaporating end is transferred to the heat dissipation fin 3 on the condensing end through the heat pipe 2 and dissipated. Usually, in order to make the heat generated by the electronic heating element be transferred and dissipated more quickly, generally It can cooperate with the cooling fan to quickly blow away the heat.

The current method of making heat pipe radiators is: put the heat conduction block 1 and heat dissipation fin 3 to be welded into the jig with positioning function, and then apply the low melting point metal paste on the parts that need to be connected during welding through a glue dispenser. The welding surface of the heat conduction block 1 and the welding groove of the heat dissipation fin 3 are placed, and then the two ends of the heat pipe 2 are respectively placed in the welding surface of the heat conduction block 1 and the welding groove of the heat dissipation fin 3, and the upper cover of the jig is covered. Then send it to the reflow furnace for heating and melting; since the upper cover with fixed and dustproof functions is above the object to be welded, it not only needs a high-power heating reflow furnace, but also requires a long welding time. In order to increase the processing speed, it is often used The structure of the long-channel sealed heating reflow furnace, when heating, the components to be welded will move slowly in the reflow furnace through the metal conveyor belt, which not only costs a lot, but also increases the process of clamping the upper cover and jig with clips, and removing clips.

Contents of the invention

Aiming at the problems of long time and high cost for welding heat pipe radiators in the prior art, the present invention researches and designs a welding device and welding method for heat pipe radiators with short welding time, low cost and convenient operation.

The technical scheme adopted in the present invention is:

A welding device for a heat pipe radiator, the heat pipe radiator includes a heat conduction block, a heat pipe and heat dissipation fins, characterized in that the welding device includes a positioning jig, a coil and an upper cover, and the positioning jig has The heat conduction block positioning groove, the heat pipe positioning groove and the heat dissipation fin positioning groove respectively make the heat conduction block, the heat pipe and the heat dissipation fin positioned; the coil is a multi-turn enameled copper wire wound on a ferrite core, and the The coil is fixed on the lower side of the upper cover, and when the radiator is welded, the upper cover covers the heat pipe radiator to be welded on the positioning jig, and the coil is provided with a high-frequency voltage by the pulse power generator.

Further, the welding device also includes an insulating ceramic pressing block fixed on the lower side of the upper cover, and when the upper covering is covered on the positioning jig, the ceramic pressing block presses the heat pipe downward. tight, so that the two ends of the heat pipe are respectively pressed on the top of the heat conduction block and the heat dissipation fins.

Further, both the positioning jig and the upper cover are made of insulating ceramic materials.

Further, when the upper cover is placed on the positioning jig, the two coils are respectively located directly above the heat dissipation fins and the heat conduction block.

Further, the welding device also includes an infrared temperature sensor used to detect the temperature of the heat pipe and the cooling fins.

Further, the positioning jig at the heat pipe positioning groove and the heat dissipation fin positioning groove has a first installation hole and a second installation hole for installing the infrared temperature sensor respectively, and the first installation hole is close to the heat conduction block Locator settings.

Further, the welding device further includes a heat insulation platform surrounding the positioning jig and a workbench surrounding the heat insulation platform.

Further, the pulse power generator includes a rectification circuit and a control circuit, the rectification circuit converts the 50/60Hz AC voltage into a DC voltage, and then converts the DC voltage into a high-power high-power high-power circuit with a frequency of 20-40KHz through the control circuit. frequency voltage.

A welding method for a heat pipe radiator, characterized in that it comprises the following steps:

S1. Put the heat conduction block and heat dissipation fins into the heat conduction block positioning groove and heat dissipation fin positioning groove of the positioning fixture respectively;

S2. Apply solder paste on the upper surface of the heat conduction block and the welding groove of the heat dissipation fin;

S3. Place the heat pipes on the heat conduction block and the heat dissipation fins correspondingly, while the heat pipes are located in the heat pipe positioning grooves;

S4. Cover the upper cover body with the coil and the ceramic compact on the positioning fixture, press the ceramic compact on the heat pipe, and closely fit the heat pipe with the heat conduction block and the heat dissipation fin;

S5. Pass a high-frequency pulse voltage to the coil through the pulse power generator. When the high-speed changing voltage passes through the coil, a high-speed changing magnetic field will be generated. When the magnetic field lines of the magnetic field pass through the heat conduction block, heat pipe, heat dissipation fin and solder paste to be welded , These welding metals generate countless small eddy currents, which make the metal body to be welded quickly heat itself, and cool down after reaching a certain temperature, and the welding can be completed.

Further, when the temperature detected by any of the infrared temperature sensors reaches the set threshold, the controller controls the pulse power generator to adjust the pulse width duty cycle of the input high-frequency voltage corresponding to the coil above it, so that the infrared The temperature detected by the temperature sensor remains close to the threshold value; until another infrared temperature sensor detects that the temperature also reaches the set threshold value, the pulse power generator is disconnected and the power supply to the two coils is stopped.

Compared with the prior art, the present invention obviously has the following beneficial effects:

1. There is no need for high-power heating reflow furnace. By inputting high-frequency pulse voltage to the coil, the heat conduction block, heat pipe, heat dissipation fin and solder paste can be heated, and the heating welding method that converts electric energy into heat energy by using the principle of electromagnetic induction , the heating time is short, the heat utilization efficiency is high and the cost is greatly reduced.

2. Two sets of coils are respectively arranged above the heat conduction block and the heat dissipation fins. Two temperature sensors obtain the temperature of the heat pipe and the heat dissipation fins respectively, and control the pulse width duty cycle of the input voltage of the two coils respectively. The heat pipe temperature and the temperature of the cooling fins ensure that the temperature can quickly melt the solder paste without causing damage due to expansion due to excessive temperature.

Description of drawings

Fig. 1 is a perspective view of placing the heat pipe radiator to be welded on the positioning jig in the prior art;

Fig. 2 is an exploded view of an embodiment of the present invention;

Fig. 3 is a schematic diagram of a positioning jig according to an embodiment of the present invention;

Fig. 4 is a perspective view of the connection of the upper cover, the coil and the ceramic compact;

Fig. 5 is a schematic diagram of the connection between the positioning fixture, the heat insulation platform and the workbench.

In the figure, 1. heat conduction block, 2. heat pipe, 3. heat dissipation fin, 31. welding groove, 4. positioning fixture, 41. heat conduction block positioning groove, 42. heat pipe positioning groove, 43. heat dissipation fin positioning groove, 44. First installation hole, 45. Second installation hole, 5. Coil, 6. Upper cover body, 7. Ceramic compact, 8. Pulse power generator, 9. Infrared temperature sensor, 10. Heat insulation platform, 11 , workbench.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In describing the present invention, it is to be understood that the terms "radial", "axial", "upper", "lower", "top", "bottom", "inner", "outer" etc. indicate orientation Or the positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; either directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

As shown in Figures 1 and 2, the heat pipe 2 radiator includes a heat conduction block 1, a heat pipe 2, and a heat dissipation fin 3. Referring to Figures 1-5, the welding device includes a positioning fixture 4, a coil 5, an upper cover 6 and a ceramic Pressing block 7, see Fig. 3, positioning jig 4 has heat conduction block positioning groove 41, heat pipe positioning groove 42 and heat dissipation fin positioning groove 43 respectively for positioning heat conduction block 1, heat pipe 2 and heat dissipation fin 3; see Fig. 4 , the coil 5 is a multi-turn enameled copper wire wound on the ferrite core, the coil 5 is fixed on the underside of the upper cover 6, and when the radiator is welded, the upper cover 6 covers the heat pipe 2 to be welded on the radiator On the positioning jig 4 , the coil 5 is supplied with a high-frequency voltage through a pulse power generator 8 . When welding the heat pipe 2 radiator, the heat conduction block 1, the heat pipe 2 and the heat dissipation fin 3 are respectively arranged in the heat conduction block positioning groove 41, the heat pipe positioning groove 42 and the heat dissipation fin positioning groove 43, wherein the evaporation end of the heat pipe 2 is arranged on the heat conduction The top of the block 1, the heat dissipation end of the heat pipe 2 is arranged in the welding groove 31 of the heat dissipation fin 3, when the upper cover body 6 is covered on the positioning jig 4, the ceramic compact 7 fixed on the lower side of the upper cover body 6 will The heat pipe 2 is pressed downward, so that the two ends of the heat pipe 2 are respectively pressed above the heat conducting block 1 and the heat dissipation fins 3 .

In this embodiment, both the positioning jig 4 and the upper cover 6 are made of insulating ceramic materials.

As a preferred embodiment, when the upper cover 6 is placed on the positioning jig 4 , the two coils 5 are respectively located directly above the heat dissipation fins 3 and the heat conduction block 1 .

In this embodiment, the positioning jig 4 at the heat pipe positioning groove 42 and the heat dissipation fin positioning groove 43 are respectively provided with a first mounting hole 44 and a second mounting hole 45 for mounting the infrared temperature sensor 9, and the first mounting hole 44 Set near the positioning slot 41 of the heat conduction block, two infrared temperature sensors 9 are respectively installed in the first installation hole 44 and the second installation hole 45, and are used to measure the heat generated by the heat pipe 2 and the heat dissipation fin 3 corresponding to the coil 5 respectively arranged above it. The size of the temperature of the heat.

In this embodiment, referring to FIG. 5 , the welding device further includes a heat insulation platform 10 surrounding the positioning jig 4 and a workbench 11 surrounding the heat insulation platform 10 .

Among them, the pulse power generator 8 includes a rectification circuit and a control circuit. The rectification circuit converts the 50/60Hz AC voltage into a DC voltage, and then converts the DC voltage into a high-power high-frequency voltage with a frequency of 20-40KHz through the control circuit.

The welding method of concrete heat pipe 2 radiator is:

S1. Put the heat conduction block 1 and the heat dissipation fins 3 into the heat conduction block positioning groove 41 and the heat dissipation fin positioning groove 43 of the positioning fixture 4, respectively;

S2. Apply solder paste on the upper surface of the heat conduction block 1 and the welding groove 31 of the heat dissipation fin 3;

S3. Place the heat pipe 2 on the heat conduction block 1 and the heat dissipation fins 3 correspondingly, while the heat pipe 2 is located in the heat pipe positioning groove 42;

S4. Cover the upper cover body 6 with the coil 5 and the ceramic compact 7 on the positioning jig 4, press the ceramic compact 7 on the heat pipe 2, and attach the heat pipe 2 to the heat conduction block 1 and the heat dissipation fin 3 closely combine;

S5. Pass high-frequency pulse voltage to the coil 5 through the pulse power generator 8. When the high-speed transformed voltage passes through the coil 5, a high-speed changing magnetic field will be generated. When the magnetic field lines of the magnetic field pass through the heat conducting block 1, heat pipe 2, and cooling fins to be welded 3. When mixing with solder paste, countless small eddy currents will be generated in the body of these welding metals, so that the metal body to be welded will heat itself rapidly, and after reaching a certain temperature, it will cool down to complete the welding.

When the temperature detected by any infrared temperature sensor 9 reaches the set threshold, the controller controls the pulse power generator 8 to stop inputting high-frequency voltage to the corresponding coil 5 above it, and enters the heat preservation state; When the sensor 9 detects that the temperature also reaches the set threshold, the pulse power generator 8 is disconnected, and the power supply to the two coils 5 is stopped.

A controlled high-power high-frequency pulse power supply can be used to control two groups of coils 5 respectively. The pulse power generator 8 not only needs to generate a high-frequency PWM type excitation current to make the coil 5 generate a high-frequency magnetic field, but also needs to be detected by the infrared temperature sensor 9. The temperature information controls the width and duty cycle of the PWM pulse, thereby controlling the heating temperature, so that the solder paste can be in a molten state, and the heat pipe is not damaged by expansion, so as to connect the heat pipe 2 with the heat conduction block 1 and the cooling fin 3 The role of welding together.

In this embodiment, the structure and method of welding a heat pipe 2 with a heat conduction block 1 and heat dissipation fins 3 are illustrated. In practical applications, multiple heat pipes and heat dissipation fins are often welded at the same time. , the two ends of multiple heat pipes are respectively placed on the heat conduction block and the heat dissipation fins. The specific welding principle and welding method are the same as those in this embodiment, and will not be repeated here.

The above-mentioned ideal embodiment according to the present invention is an inspiration. Through the above-mentioned description, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (10)

1. A welding device for a heat pipe radiator, said heat pipe radiator comprising a heat conduction block (1), a heat pipe (2) and cooling fins (3), characterized in that said welding device comprises a positioning jig (4) , the coil (5) and the upper cover (6), the positioning jig (4) has a heat conduction block positioning groove for respectively positioning the heat conduction block (1), the heat pipe (2) and the heat dissipation fin (3) (41), heat pipe locating groove (42) and radiating fin locating groove (43); Described coil (5) is to wind multi-turn enamelled copper wire on ferrite core, and described coil (5) is fixed on The lower side of the upper cover (6), when welding the heat pipe radiator, the upper cover (6) covers the heat pipe (2) radiator to be welded on the positioning jig (4), and generates The device (8) provides high-frequency voltage to the coil (5). 2. The welding device of heat pipe radiator according to claim 1, characterized in that, said welding device also includes an insulating ceramic compact (7) fixed on the underside of said upper cover (6), when said When the upper cover body (6) is covered on the positioning jig (4), the ceramic compact (7) presses the heat pipe (2) downward, so that the two ends of the heat pipe (2) are respectively pressed Above the heat conduction block (1) and heat dissipation fins (3). 3. The welding device for heat pipe radiator according to claim 1, characterized in that, both the positioning jig (4) and the upper cover (6) are made of insulating ceramic materials. 4. The welding device for heat pipe radiator according to claim 1, characterized in that, when the upper cover (6) is covered on the positioning jig (4), the two coils (5) respectively It is located directly above the heat dissipation fins (3) and the heat conduction block (1). 5. The welding device of the heat pipe radiator according to claim 1, characterized in that, the welding device further comprises an infrared temperature sensor (9) for detecting the temperature of the heat pipe (2) and the cooling fins (3). 6. The welding device of the heat pipe radiator according to claim 5, characterized in that, the positioning jigs (4) at the heat pipe positioning groove (42) and the heat dissipation fin positioning groove (43) are respectively equipped with The first installation hole (44) and the second installation hole (45) of the infrared temperature sensor (9) are installed, and the first installation hole (44) is arranged close to the positioning groove (41) of the heat conduction block. 7. The welding device of heat pipe radiator according to claim 1, characterized in that, said welding device also comprises a heat insulation platform (10) surrounded by said positioning jig (4) and a heat insulation platform (10) surrounded by said positioning jig (4). The workbench (11) around thermal platform (10). 8. The welding device of heat pipe radiator according to claim 1, characterized in that, the pulse power generator (8) comprises a rectification circuit and a control circuit, and the rectification circuit converts the AC voltage of 50/60Hz into a direct current Voltage, and then through the control circuit to convert the DC voltage into a high-power high-frequency voltage with a frequency of 20-40KHz. 9. A welding method for a heat pipe radiator, comprising the following steps: S1. Put the heat conduction block (1) and heat dissipation fins (3) into the heat conduction block positioning groove (41) and heat dissipation fin positioning groove (43) of the positioning fixture (4) respectively; S2, spot-coat solder paste on the upper surface of the heat conduction block (1) and the welding groove (31) of the heat dissipation fin (3); S3, placing the heat pipe (2) on the heat conduction block (1) and the heat dissipation fins (3) correspondingly, while the heat pipe (2) is located in the heat pipe positioning groove (42); S4. Cover the upper cover body (6) with the coil (5) and the ceramic compact (7) on the positioning fixture (4), so that the ceramic compact (7) is pressed on the heat pipe (2), and the heat pipe (2) closely adhere to the heat conduction block (1) and the heat dissipation fins (3); S5, pass the high-frequency pulse voltage to the coil (5) through the pulse power generator (8), and a high-speed changing magnetic field will be generated when the high-speed transformed voltage passes through the coil (5). When the magnetic field lines of the magnetic field pass through the heat-conducting block (1) ), heat pipes (2), cooling fins (3) and solder paste, numerous small eddy currents will be generated in these welding metal bodies, so that the metal body to be welded will heat itself rapidly, and after reaching a certain temperature, it will be cooled to complete the welding. 10. the welding method of heat pipe radiator according to claim 9, is characterized in that, when the temperature that described any infrared temperature sensor (9) detects reaches the threshold value of setting, controller controls pulse power generator (8 ) adjust the pulse width duty cycle corresponding to the input high-frequency voltage of the coil above it, so that the temperature detected by this infrared temperature sensor (9) remains near the threshold; until another infrared temperature sensor (9) detects that the temperature also reaches When the threshold is set, the pulse power generator (8) is disconnected, and the power supply to the two coils (5) is stopped.