Welding jig and method for radiator integrated capacitor module

Abstract

The invention discloses a welding jig and method for a radiator integrated capacitor module, and aims to overcome the defects that the capacitor module and a radiator are inconvenient to weld, the surface of the radiator is scratched in the welding process, the capacitor arrangement state is inconsistent, and the welding void rate is high. The jig comprises a jig base, a transverse positioning convex edge and a longitudinal positioning convex edge are arranged on the jig base, a plurality of capacitors which are arranged at intervals are connected between two radiators which are opposite up and down, a positioning ejector rod is installed on the jig base, and the two sides of one radiator are positioned through the transverse positioning convex edge and the longitudinal positioning convex edge respectively. And two sides of the other radiator are respectively positioned through a longitudinal positioning convex edge and a positioning ejector rod. The welding jig facilitates welding of the integrated capacitor modules of the radiator, the phenomenon that the surfaces are scratched in the welding process is avoided, the capacitor modules are arranged in order, and the welding void rate is low.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency power supply heat dissipation, and more particularly to a welding jig and method for a radiator integrated capacitor module. Background Art

[0002] With the continuous advancement of science and technology, the requirements for RF power supplies are becoming more and more stringent. On the one hand, higher power density means that the equipment needs to generate more power in a smaller space, which will inevitably lead to a sharp increase in heat. Traditional heat dissipation methods are difficult to meet the growing heat dissipation needs, and the integration of high-efficiency heat sinks has become the key. On the other hand, RF power supplies require a stable power supply when working, and capacitors play an indispensable role in filtering, energy storage, etc. However, independent capacitors not only take up space, but may also affect performance due to wiring and other issues. For example, Chinese patent application No. 2019221194147 discloses a capacitor radiator that adds mounting slots for components such as capacitors, which not only provides good heat dissipation effects, but also assists in fixing and protecting the capacitor. However, the radiator and capacitor are independent of each other and are not integrated.

[0003] The emergence of radiator-integrated capacitor modules has effectively solved these problems. It organically combines the heat dissipation function with the capacitor function, reducing the overall volume and weight and improving space utilization. At the same time, through optimized design, the capacitor and heat dissipation structure work together to improve the heat dissipation efficiency while ensuring the electrical performance stability of the RF power supply. This innovative module conforms to the trend of RF power supply development towards miniaturization and high performance, injecting new vitality into the RF power supply market, and is expected to become the mainstream configuration of the market in the future, promoting further upgrading of related industries. However, it is inconvenient to weld the capacitor module to the radiator. During the welding process, problems such as scratches on the radiator surface, inconsistent capacitor arrangement, and high welding void rate will occur. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings, the present invention provides a welding jig and method for a radiator integrated capacitor module, which facilitates the welding of the radiator integrated capacitor module, avoids surface scratches during the welding process, arranges the capacitor modules neatly, and has a low welding void rate.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a welding jig for a radiator integrated capacitor module, comprising a jig base, a horizontal positioning convex edge and a longitudinal positioning convex edge being provided on the jig base, a plurality of capacitors spaced apart being connected between two radiators facing each other, a positioning push rod being installed on the jig base, the two sides of one radiator being positioned respectively by the horizontal positioning convex edge and the longitudinal positioning convex edge, and the two sides of the other radiator being positioned respectively by the longitudinal positioning convex edge and the positioning push rod.

[0006] When soldering a heat sink integrated capacitor module, first apply flux and solder to the heat sink where it meets the capacitor. Next, load one heat sink onto the jig base, aligning the two sides of the heat sink with the horizontal and vertical positioning flanges. Next, load the capacitor onto the jig base, then load another heat sink onto the jig base, inserting the two ends of the capacitor into the two heat sinks where they meet the capacitor. Finally, press the positioning pin onto the heat sink. At this point, the welding jig positions the heat sink and capacitor. The welding jig, loaded with the heat sink and capacitor, is then placed into a vacuum furnace for soldering.

[0007] The lateral positioning flange enables longitudinal positioning of the radiator, while the longitudinal positioning flange enables transverse positioning of the radiator. The positioning pins press against the radiator, thereby achieving longitudinal positioning of the two radiators and capacitors. The welding jig for the radiator-integrated capacitor module facilitates welding of the radiator-integrated capacitor module, preventing surface scratches during welding, ensuring neatly arranged capacitor modules and low solder void rates.

[0008] Preferably, a positioning and separating block is provided between two adjacent capacitors, and the positioning and separating block is connected to the fixture base.

[0009] The positioning separator is set on the fixture base to achieve precise positioning of the capacitor.

[0010] Preferably, a protective gasket is provided between the positioning ejector rod and the radiator.

[0011] The protective gasket is placed between the positioning ejector rod and the radiator to protect the radiator and prevent the radiator surface from being scratched.

[0012] Preferably, the positioning push rod is L-shaped, a sliding sleeve is installed on the fixture base, the positioning push rod is connected to the sliding sleeve by a rotating sleeve, an avoidance groove is provided on the side wall of the sliding sleeve, and a positioning spring is installed between the sliding sleeve and the positioning push rod.

[0013] The L-shaped positioning rod is rotated so that it is stuck in one end of the avoidance groove and retracted into the sliding sleeve. When the radiator needs to be positioned, the positioning rod is reversed to the position corresponding to the avoidance groove. At this time, under the action of the positioning spring, the positioning rod slides along the avoidance groove, and the end of the positioning rod extends outward and abuts the radiator to achieve longitudinal positioning.

[0014] Preferably, a welding groove corresponding to the capacitor is provided on the heat sink, and the end of the capacitor is connected to the welding groove.

[0015] The radiator is provided with a welding groove to facilitate reliable positioning during welding with the capacitor, which is beneficial to improving the reliability of the connection between the capacitor and the radiator.

[0016] Preferably, two heat dissipation windows are provided on the fixture base, and the two heat dissipation windows correspond to the two radiators respectively.

[0017] The heat dissipation window can reduce the weight of the fixture base and help speed up heat transfer.

[0018] Preferably, a movable slide is installed on the fixture base, a lifting guide column is provided on the slide, the lifting guide column is equipped with a pressure plate and a compression spring, a positioning rib is provided on the pressure plate, the pressure plate is pressed against the two heat sinks, and the positioning rib is pressed against the capacitor.

[0019] After the positioning push rod presses and positions the radiator, pull the pressure plate upwards and pull the slide toward the radiator. After the pressure plate reaches above the radiator, release the pressure plate. The pressure plate is pressed tightly on the two radiators, and the positioning ridges are pressed tightly on the capacitor, thereby achieving vertical positioning of the radiator and capacitor.

[0020] A method for welding a radiator-integrated capacitor module is provided. The method utilizes a welding jig for the radiator-integrated capacitor module for welding, and comprises the following steps: S1, applying flux and applying solder to a radiator welding groove; S2, mounting a radiator on a jig base, with both sides of the radiator respectively aligned with a transverse positioning convex edge and a longitudinal positioning convex edge for positioning; S3, mounting a capacitor on the jig base; S4, mounting another radiator on the jig base, with both ends of the capacitor respectively inserted into the two radiator welding grooves; S5, longitudinally pressing the radiator with a positioning ejector rod; and S6, placing the welding jig into a furnace for welding.

[0021] Before soldering the heat sink to the capacitor, flux and solder are applied to the heat sink's soldering grooves. One heat sink is then positioned on the jig base, followed by the capacitor. Finally, the other heat sink is placed on the jig base, positioning the capacitor between the two heat sinks' soldering grooves. Finally, the entire jig is placed in a vacuum soldering furnace for vacuum soldering. Multiple capacitors can be soldered at once, and the number of capacitors can be adjusted as needed. Using a vacuum reflow process, the result is a single-step process, completely eliminating any pores created during the soldering process. The void ratio is less than 3%, ensuring high solder reliability.

[0022] Preferably, before S1, a high temperature resistant protective film is attached to the outer surface of the radiator.

[0023] The surface coating process is adopted to attach a high temperature resistant protective film to the outer surface of the radiator to protect the surface of the radiator and the integrity of the silver plating layer.

[0024] Preferably, the heat sink is made of copper, and a silver-plated layer is provided on the outer surface of the heat sink.

[0025] The copper heat sink has good thermal conductivity and heat dissipation capabilities. The silver plating layer improves the corrosion resistance of the heat sink and further improves the heat dissipation capacity.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the welding jig facilitates the welding of the radiator integrated capacitor module, avoids surface scratches during the welding process, and the capacitor modules are arranged neatly with a low welding void rate; (2) the positioning partition block is arranged on the jig base, which realizes the precise positioning of the capacitor; (3) the protective gasket is placed between the positioning push rod and the radiator, which protects the radiator and prevents scratches on the radiator surface; (4) after the positioning push rod presses the radiator to position it, the pressure plate is pulled upward and the slide is pulled toward the radiator. After the pressure plate reaches the top of the radiator, the pressure plate is released, the pressure plate is pressed on the two radiators, and the positioning rib is pressed on the capacitor, thereby realizing the vertical positioning of the radiator and the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a welding jig of the present invention.

[0028] Figure 2 It is a diagram showing the use of the welding jig of the present invention.

[0029] Figure 3 It is an exploded view of the radiator integrated capacitor module of the present invention.

[0030] Figure 4 It is a top view of the present invention.

[0031] Figure 5 This is a side view of a welding jig according to Example 2 of the present invention.

[0032] Figure 6 This is a side view of a welding jig according to Example 3 of the present invention.

[0033] Figure 7 This is a connection diagram of the positioning plate of Example 3 of the present invention.

[0034] In the figure: 1. fixture base, 2. horizontal positioning convex edge, 3. longitudinal positioning convex edge, 4. capacitor, 5. positioning ejector, 6. positioning separator, 7. heat dissipation slot, 8. welding slot, 9. sinking slot, 10. baffle, 11. heat dissipation window, 12. protective gasket, 13. sliding sleeve, 14. avoidance slot, 15. positioning spring, 16. positioning column, 17. T-shaped hole, 18. sliding seat, 19. lifting guide column, 20. pressure plate, 21. compression spring, 22. positioning convex strip, 23. limit head, 24. slide rail, 25. support, 26. push rod, 27. positioning plate, 28. push slot, 29. guide rod, 30. guide slot, 31. mounting slot, 32. radiator. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A welding fixture for a heat sink integrated capacitor module (see Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 ), comprising a jig base 1, on which a transverse positioning rib 2 and a longitudinal positioning rib 3 are provided, which are connected together to form an L-shaped structure, and both the transverse positioning rib 2 and the longitudinal positioning rib 3 are provided at the edge of the jig base 1, and a plurality of spaced capacitors 4 are connected between two upper and lower radiators 32 facing each other, and a positioning push rod 5 with elasticity is installed on the jig base 1, which moves longitudinally to press against the radiator 32. The two sides of one radiator 32 are positioned respectively by the transverse positioning rib 2 and the longitudinal positioning rib 3, and the two sides of the other radiator 32 are positioned respectively by the longitudinal positioning rib 3 and the positioning push rod 5. The upper end of the capacitor 4 is lower than the upper end of the radiator 32, and the lower end of the capacitor 4 and the lower end of the radiator 32 are both supported on the jig base 1.

[0036] A positioning block 6 is placed between adjacent capacitors 4 and is connected to the jig base 1. This block 6, placed on the jig base 1, precisely positions the capacitors 4. The block 6 is lower than the capacitors 4 and is integral with the jig base 1. Heat dissipation slots 7 are provided on both the front and rear sides of the block 6 on the jig base 1. The locations where the capacitors 4 are soldered to the heat sink 32 correspond to these slots 7.

[0037] A welding groove 8 corresponding to the capacitor 4 is provided on the radiator 32, and the end of the capacitor 4 is connected to the welding groove 8. A sinking groove 9 is provided on the side of the radiator 32, and the left, right and bottom sides of the sinking groove 9 are all connected to the outer surface of the radiator 32. A plurality of baffles 10 are provided at intervals on the bottom surface of the sinking groove 9, and the space between two adjacent baffles 10 forms a welding groove 8. A gap is left between the upper edge of the baffle 10 and the upper side wall of the sinking groove 9. Two heat dissipation windows 11 are provided on the jig base 1, and the two heat dissipation windows 11 correspond to the two radiators 32 respectively. The heat dissipation window 11 can reduce the weight of the jig base 1, which is conducive to accelerating the transfer of heat.

[0038] A protective gasket 12 is arranged between the positioning push rod 5 and the radiator 32. The protective gasket 12 is in the shape of an elongated strip and is made of an alumina ceramic sheet. The protective gasket 12 is placed against the cooling fins of the radiator 32 to prevent the positioning push rod 5 from directly contacting the cooling fins and causing damage to the cooling fin structure.

[0039] Two positioning push rods 5 are positioned opposite each other on the left and right sides. The positioning push rods 5 are L-shaped, with a sleeve 13 mounted on the fixture base 1. The positioning push rods 5 are rotatably connected to the sleeve 13. A clearance groove 14 is provided on the side wall of the sleeve 13, extending to one end of the sleeve 13. A positioning spring 15 is installed between the sleeve 13 and the positioning push rods 5. A positioning post 16 is provided at the end of the positioning push rod 5. A T-shaped hole 17 is provided in the sleeve 13. The positioning post 16 fits into the T-shaped hole 17. The positioning spring 15 is installed in the T-shaped hole 17 and abuts the transition surface between the end of the positioning post 16 and the inner wall of the sleeve 13.

[0040] The L-shaped positioning push rod 5 is rotated so that it is stuck in one end of the avoidance groove 14. At this time, the positioning push rod 5 is misaligned with the avoidance groove 14, and one end of the positioning push rod 5 is retracted into the sliding sleeve 13. When it is necessary to position the radiator 32, the positioning push rod 5 is reversed to a position corresponding to the avoidance groove 14. At this time, under the action of the positioning spring 15, the positioning push rod 5 slides along the avoidance groove 14, and the end of the positioning push rod 5 extends outward. The end of the positioning column 16 presses against the protective gasket 12, and the protective gasket 12 compresses the radiator 32 longitudinally to position it.

[0041] A method for soldering a heat sink integrated capacitor module is disclosed, wherein soldering is performed using a soldering jig for the heat sink integrated capacitor module, and the method includes the following steps: S1, applying flux and applying solder to the soldering groove 8 of the heat sink 32; the flux is a rosin-type liquid flux, which has the function of improving solder wettability and fixing the solder. The solder is a tin-silver-copper solder sheet, which is 80% to 100% of the size of the pad and has a thickness of 0.06 to 0.12 mm. The heat sink 32 is made of copper, and a silver-plated layer is provided on the outer surface of the heat sink 32. Prior to S1, a high-temperature resistant protective film is attached to the outer surface of the heat sink 32, and the high-temperature resistant protective film protects the silver-plated layer.

[0042] S2, a heat sink 32 is mounted on the fixture base 1, and two sides of the heat sink 32 are respectively aligned with the horizontal positioning convex edge 2 and the longitudinal positioning convex edge 3 for positioning.

[0043] S3, install the capacitor 4 on the fixture base 1; the positioning separator 6 accurately positions the capacitor 4 in the horizontal direction, and one end of the capacitor 4 is inserted into the welding groove 8 to achieve the longitudinal positioning of the capacitor 4.

[0044] S4, another heat sink 32 is mounted on the fixture base 1, and the side of the heat sink 32 is aligned with the longitudinal positioning flange 3. The two ends of the capacitor 4 are respectively inserted into the welding grooves 8 of the two heat sinks 32.

[0045] S5. Install the protective gasket 12 between the positioning rod 5 and the radiator 32. The positioning rod 5 compresses the radiator 32 longitudinally. During operation, the positioning rod 5 is rotated to a position corresponding to the avoidance groove 14. Under the action of the positioning spring 15, the positioning rod 5 slides along the avoidance groove 14. The end of the positioning rod 5 extends outward, and the end of the positioning column 16 presses against the protective gasket 12, which compresses the radiator 32 longitudinally and positions it.

[0046] S6, the welding jig is put into the furnace for welding. The welding jig with the heat sink 32 and capacitor 4 positioned is placed in a vacuum welding furnace for vacuum welding. Use a vacuum reflow process for welding to ensure that the welding void rate is less than 10%. By adding a vacuum process during the solder paste melting stage to remove the pores generated when the flux boils, the void rate can be guaranteed to be less than 3%. After the welding is completed, take out the welding tool, return the positioning pin 5 to its position, remove the welded heat sink 32 and capacitor 4, remove the high-temperature resistant protective film, use cleaning fluid to clean, and dry to obtain a complete heat sink 32 integrated capacitor 4 module.

[0047] Example 2: A welding fixture for a heat sink integrated capacitor module (see Figure 5 ), comprising a jig base 1, on which a transverse positioning rib 2 and a longitudinal positioning rib 3 are provided, which are connected together to form an L-shaped structure, and both the transverse positioning rib 2 and the longitudinal positioning rib 3 are provided at the edge of the jig base 1, and a plurality of spaced capacitors 4 are connected between two upper and lower radiators 32 facing each other, and a positioning push rod 5 with elasticity is installed on the jig base 1, which moves longitudinally to press against the radiator 32. The two sides of one radiator 32 are positioned respectively by the transverse positioning rib 2 and the longitudinal positioning rib 3, and the two sides of the other radiator 32 are positioned respectively by the longitudinal positioning rib 3 and the positioning push rod 5. The upper end of the capacitor 4 is lower than the upper end of the radiator 32, and the lower end of the capacitor 4 and the lower end of the radiator 32 are both supported on the jig base 1.

[0048] A positioning block 6 is placed between adjacent capacitors 4 and is connected to the jig base 1. This block 6, placed on the jig base 1, precisely positions the capacitors 4. The block 6 is lower than the capacitors 4 and is integral with the jig base 1. Heat dissipation slots 7 are provided on both the front and rear sides of the block 6 on the jig base 1. The locations where the capacitors 4 are soldered to the heat sink 32 correspond to these slots 7.

[0049] A welding groove 8 corresponding to the capacitor 4 is provided on the radiator 32, and the end of the capacitor 4 is connected to the welding groove 8. A sinking groove 9 is provided on the side of the radiator 32, and the left, right and bottom sides of the sinking groove 9 are all connected to the outer surface of the radiator 32. A plurality of baffles 10 are provided at intervals on the bottom surface of the sinking groove 9, and the space between two adjacent baffles 10 forms a welding groove 8. A gap is left between the upper edge of the baffle 10 and the upper side wall of the sinking groove 9. Two heat dissipation windows 11 are provided on the jig base 1, and the two heat dissipation windows 11 correspond to the two radiators 32 respectively. The heat dissipation window 11 can reduce the weight of the jig base 1, which is conducive to accelerating the transfer of heat.

[0050] A protective gasket 12 is arranged between the positioning push rod 5 and the radiator 32. The protective gasket 12 is in the shape of an elongated strip and is made of an alumina ceramic sheet. The protective gasket 12 is placed against the cooling fins of the radiator 32 to prevent the positioning push rod 5 from directly contacting the cooling fins and causing damage to the cooling fin structure.

[0051] Two positioning push rods 5 are positioned opposite each other on the left and right sides. The positioning push rods 5 are L-shaped, with a sleeve 13 mounted on the fixture base 1. The positioning push rods 5 are rotatably connected to the sleeve 13. A clearance groove 14 is provided on the side wall of the sleeve 13, extending to one end of the sleeve 13. A positioning spring 15 is installed between the sleeve 13 and the positioning push rods 5. A positioning post 16 is provided at the end of the positioning push rod 5. A T-shaped hole 17 is provided in the sleeve 13. The positioning post 16 fits into the T-shaped hole 17. The positioning spring 15 is installed in the T-shaped hole 17 and abuts the transition surface between the end of the positioning post 16 and the inner wall of the sleeve 13.

[0052] The L-shaped positioning push rod 5 is rotated so that it is stuck in one end of the avoidance groove 14. At this time, the positioning push rod 5 is misaligned with the avoidance groove 14, and one end of the positioning push rod 5 is retracted into the sliding sleeve 13. When it is necessary to position the radiator 32, the positioning push rod 5 is reversed to a position corresponding to the avoidance groove 14. At this time, under the action of the positioning spring 15, the positioning push rod 5 slides along the avoidance groove 14, and the end of the positioning push rod 5 extends outward. The end of the positioning column 16 presses against the protective gasket 12, and the protective gasket 12 compresses the radiator 32 longitudinally to position it.

[0053] A slide 18 is mounted on the fixture base 1, allowing for transverse movement. A lifting guide post 19 is mounted on the slide 18. The lifting guide post 19 is fitted with a pressure plate 20 and a compression spring 21. The pressure plate 20 is provided with a positioning rib 22, which presses against the two heat sinks 32, while the positioning rib 22 presses against the capacitor 4. The lifting guide post 19 is connected to a stopper 23 at its upper portion, with the compression spring 21 abutting between the stopper 23 and the pressure plate 20. A slide rail 24 with an isosceles trapezoidal cross-section is mounted on the fixture base 1. A slide groove is provided on the slide 18, through which the slide 18 is slidably connected to the slide rail 24.

[0054] After the positioning push rod 5 presses and positions the radiator 32, the pressure plate 20 is pulled upward and the slide 18 is pulled toward the radiator 32. After the pressure plate 20 reaches above the radiator 32, the pressure plate 20 is released. The pressure plate 20 is pressed tightly on the two radiators 32, and the positioning ridges 22 are pressed tightly on the capacitor 4, thereby realizing the vertical positioning of the radiator 32 and the capacitor 4.

[0055] A method for soldering a heat sink integrated capacitor module is disclosed, wherein soldering is performed using a soldering jig for the heat sink integrated capacitor module, and the method includes the following steps: S1, applying flux and applying solder to the soldering groove 8 of the heat sink 32; the flux is a rosin-type liquid flux, which has the function of improving solder wettability and fixing the solder. The solder is a tin-silver-copper solder sheet, which is 80% to 100% of the size of the pad and has a thickness of 0.06 to 0.12 mm. The heat sink 32 is made of copper, and a silver-plated layer is provided on the outer surface of the heat sink 32. Prior to S1, a high-temperature resistant protective film is attached to the outer surface of the heat sink 32, and the high-temperature resistant protective film protects the silver-plated layer.

[0056] S2, a heat sink 32 is mounted on the fixture base 1, and two sides of the heat sink 32 are respectively aligned with the horizontal positioning convex edge 2 and the longitudinal positioning convex edge 3 for positioning.

[0057] S3, install the capacitor 4 on the fixture base 1; the positioning separator 6 accurately positions the capacitor 4 in the horizontal direction, and one end of the capacitor 4 is inserted into the welding groove 8 to achieve the longitudinal positioning of the capacitor 4.

[0058] S4, another heat sink 32 is mounted on the fixture base 1, and the side of the heat sink 32 is aligned with the longitudinal positioning flange 3. The two ends of the capacitor 4 are respectively inserted into the welding grooves 8 of the two heat sinks 32.

[0059] S5, load the protective gasket 12 between the positioning push rod 5 and the radiator 32, and the positioning push rod 5 presses the radiator 32 longitudinally. During operation, rotate the positioning push rod 5 to the position corresponding to the avoidance groove 14. Under the action of the positioning spring 15, the positioning push rod 5 slides along the avoidance groove 14, the end of the positioning push rod 5 extends outward, and the end of the positioning column 16 presses on the protective gasket 12, and the protective gasket 12 presses and positions the radiator 32 longitudinally. Pull up the pressure plate 20, pull the slide 18 toward the radiator 32, and after the pressure plate 20 reaches the top of the radiator 32, release the pressure plate 20. The pressure plate 20 presses on the two radiators 32, and the positioning ridge 22 presses on the capacitor 4, thereby realizing the vertical positioning of the radiator 32 and the capacitor 4.

[0060] S6, the welding jig is put into the furnace for welding. The welding jig with the heat sink 32 and capacitor 4 positioned is placed in a vacuum welding furnace for vacuum welding. Use a vacuum reflow process for welding to ensure that the welding void rate is less than 10%. By adding a vacuum process during the solder paste melting stage to remove the pores generated when the flux boils, the void rate can be guaranteed to be less than 3%. After the welding is completed, take out the welding tool, return the positioning pin 5 to its position, remove the welded heat sink 32 and capacitor 4, remove the high-temperature resistant protective film, use cleaning fluid to clean, and dry to obtain a complete heat sink 32 integrated capacitor 4 module.

[0061] Example 3: A welding fixture for a heat sink integrated capacitor module (see Figure 6 、 Figure 7 ), comprising a jig base 1, on which a transverse positioning rib 2 and a longitudinal positioning rib 3 are provided, which are connected together to form an L-shaped structure, and both the transverse positioning rib 2 and the longitudinal positioning rib 3 are provided at the edge of the jig base 1, and a plurality of spaced capacitors 4 are connected between two upper and lower radiators 32 facing each other, and a positioning push rod 5 with elasticity is installed on the jig base 1, which moves longitudinally to press against the radiator 32. The two sides of one radiator 32 are positioned respectively by the transverse positioning rib 2 and the longitudinal positioning rib 3, and the two sides of the other radiator 32 are positioned respectively by the longitudinal positioning rib 3 and the positioning push rod 5. The upper end of the capacitor 4 is lower than the upper end of the radiator 32, and the lower end of the capacitor 4 and the lower end of the radiator 32 are both supported on the jig base 1.

[0062] A positioning block 6 is placed between adjacent capacitors 4 and is connected to the jig base 1. This block 6, placed on the jig base 1, precisely positions the capacitors 4. The block 6 is lower than the capacitors 4 and is integral with the jig base 1. Heat dissipation slots 7 are provided on both the front and rear sides of the block 6 on the jig base 1. The locations where the capacitors 4 are soldered to the heat sink 32 correspond to these slots 7.

[0063] A welding groove 8 corresponding to the capacitor 4 is provided on the radiator 32, and the end of the capacitor 4 is connected to the welding groove 8. A sinking groove 9 is provided on the side of the radiator 32, and the left, right and bottom sides of the sinking groove 9 are all connected to the outer surface of the radiator 32. A plurality of baffles 10 are provided at intervals on the bottom surface of the sinking groove 9, and the space between two adjacent baffles 10 forms a welding groove 8. A gap is left between the upper edge of the baffle 10 and the upper side wall of the sinking groove 9. Two heat dissipation windows 11 are provided on the jig base 1, and the two heat dissipation windows 11 correspond to the two radiators 32 respectively. The heat dissipation window 11 can reduce the weight of the jig base 1, which is conducive to accelerating the transfer of heat.

[0064] A protective gasket 12 is arranged between the positioning push rod 5 and the radiator 32. The protective gasket 12 is in the shape of an elongated strip and is made of an alumina ceramic sheet. The protective gasket 12 is placed against the cooling fins of the radiator 32 to prevent the positioning push rod 5 from directly contacting the cooling fins and causing damage to the cooling fin structure.

[0065] Two positioning push rods 5 are positioned opposite each other on the left and right sides. The positioning push rods 5 are L-shaped, with a sleeve 13 mounted on the fixture base 1. The positioning push rods 5 are rotatably connected to the sleeve 13. A clearance groove 14 is provided on the side wall of the sleeve 13, extending to one end of the sleeve 13. A positioning spring 15 is installed between the sleeve 13 and the positioning push rods 5. A positioning post 16 is provided at the end of the positioning push rod 5. A T-shaped hole 17 is provided in the sleeve 13. The positioning post 16 fits into the T-shaped hole 17. The positioning spring 15 is installed in the T-shaped hole 17 and abuts the transition surface between the end of the positioning post 16 and the inner wall of the sleeve 13.

[0066] The L-shaped positioning push rod 5 is rotated so that the positioning push rod 5 is stuck in one end of the avoidance groove 14 . At this time, the positioning push rod 5 is misaligned with the avoidance groove 14 , and one end of the positioning push rod 5 is retracted into the sliding sleeve 13 .

[0067] A support 25 is provided on the fixture base 1. A push rod 26 is mounted on the support 25 for longitudinal movement. The positioning column 16 is rotatably mounted on the positioning push rod 5. The push rod 26 is connected to the positioning column 16. A positioning plate 27 is mounted on the support 25 for transverse movement. The positioning plate 27 is provided with an inclined push groove 28. A guide rod 29 is connected between the push rod 26 and the push groove 28. The positioning plate 27 corresponds to the gap between the upper edge of the stop bar 10 and the upper side wall of the sinking groove 9. The upper end surface of the capacitor 4 is flush with the upper end surface of the stop bar 10. A guide groove 30 and a mounting groove 31 are provided on the support 25. The positioning plate 27 is adapted to be connected to the mounting groove 31. The guide groove 30 is longitudinally arranged. The guide rod 29 is placed in the guide groove 30 and slides along the guide groove 30.

[0068] When it is necessary to position the radiator 32, the positioning push rod 5 is reversed to a position corresponding to the avoidance groove 14. At this time, under the action of the positioning spring 15, the positioning push rod 5 slides along the avoidance groove 14, the end of the positioning push rod 5 extends outward, and the end of the positioning column 16 hits the protective gasket 12, which then compresses and positions the radiator 32 longitudinally. The push rod 26 moves synchronously with the positioning push rod 5. The guide rod 29 connected to the push rod 26 moves along the inclined pushing groove 28, thereby pushing the positioning plate 27 toward the gap between the upper edge of the blocking bar 10 and the upper side wall of the sinking groove 9. The positioning plate 27 is stuck in this gap to achieve vertical positioning of the capacitor 4 and the radiator 32. Through this structural arrangement, not only the longitudinal positioning of the radiator 32 and the capacitor 4 is achieved, but also the vertical positioning of the radiator 32 and the capacitor 4 is achieved.

[0069] A method for soldering a heat sink integrated capacitor module is disclosed, wherein soldering is performed using a soldering jig for the heat sink integrated capacitor module, and the method includes the following steps: S1, applying flux and applying solder to the soldering groove 8 of the heat sink 32; the flux is a rosin-type liquid flux, which has the function of improving solder wettability and fixing the solder. The solder is a tin-silver-copper solder sheet, which is 80% to 100% of the size of the pad and has a thickness of 0.06 to 0.12 mm. The heat sink 32 is made of copper, and a silver-plated layer is provided on the outer surface of the heat sink 32. Prior to S1, a high-temperature resistant protective film is attached to the outer surface of the heat sink 32, and the high-temperature resistant protective film protects the silver-plated layer.

[0070] S2, a heat sink 32 is mounted on the fixture base 1, and two sides of the heat sink 32 are respectively aligned with the horizontal positioning convex edge 2 and the longitudinal positioning convex edge 3 for positioning.

[0071] S3, install the capacitor 4 on the fixture base 1; the positioning separator 6 accurately positions the capacitor 4 in the horizontal direction, and one end of the capacitor 4 is inserted into the welding groove 8 to achieve the longitudinal positioning of the capacitor 4.

[0072] S4, another heat sink 32 is mounted on the fixture base 1, and the side of the heat sink 32 is aligned with the longitudinal positioning flange 3. The two ends of the capacitor 4 are respectively inserted into the welding grooves 8 of the two heat sinks 32.

[0073] S5. A protective gasket 12 is placed between the positioning push rod 5 and the radiator 32, and the positioning push rod 5 compresses the radiator 32 longitudinally. During operation, the positioning push rod 5 is rotated to a position corresponding to the avoidance groove 14. Under the action of the positioning spring 15, the positioning push rod 5 slides along the avoidance groove 14, the end of the positioning push rod 5 extends outward, and the end of the positioning column 16 presses against the protective gasket 12, which compresses and positions the radiator 32 longitudinally. The push rod 26 moves synchronously with the positioning push rod 5. The guide rod 29 connected to the push rod 26 moves along the inclined pushing groove 28, thereby pushing the positioning plate 27 toward the gap between the upper edge of the blocking bar 10 and the upper side wall of the sinking groove 9. The positioning plate 27 is stuck in this gap to achieve vertical positioning of the capacitor 4 and the radiator 32.

[0074] S6, the welding jig is put into the furnace for welding. The welding jig with the heat sink 32 and capacitor 4 positioned is placed in a vacuum welding furnace for vacuum welding. Use a vacuum reflow process for welding to ensure that the welding void rate is less than 10%. By adding a vacuum process during the solder paste melting stage to remove the pores generated when the flux boils, the void rate can be guaranteed to be less than 3%. After the welding is completed, take out the welding tool, return the positioning pin 5 to its position, return the positioning plate 27 to its position and separate it from the heat sink 32 and capacitor 4, remove the heat sink 32 and capacitor 4 welded together, remove the high-temperature resistant protective film, use cleaning fluid to clean, and dry to obtain a complete heat sink 32 integrated capacitor 4 module.

[0075] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A welding fixture for a radiator integrated capacitor module, characterized in that: The jig base includes a jig having a transverse positioning convex edge and a longitudinal positioning convex edge. A plurality of capacitors arranged at intervals are connected between two radiators facing each other. A positioning ejector rod is installed on the jig base. The two sides of one radiator are positioned by the transverse positioning convex edge and the longitudinal positioning convex edge respectively, and the two sides of the other radiator are positioned by the longitudinal positioning convex edge and the positioning ejector rod respectively.

2. The welding jig for a radiator integrated capacitor module according to claim 1, characterized in that: A positioning and separating block is provided between two adjacent capacitors, and the positioning and separating block is connected to the fixture base.

3. The welding jig for a radiator integrated capacitor module according to claim 1, characterized in that: A protective gasket is provided between the positioning ejector rod and the radiator.

4. The welding jig for a radiator integrated capacitor module according to claim 1, characterized in that: The positioning ejector rod is in an L-shaped structure, a sliding sleeve is installed on the fixture base, the positioning ejector rod is connected to the sliding sleeve rotation set, an avoidance groove is provided on the side wall of the sliding sleeve, and a positioning spring is installed between the sliding sleeve and the positioning ejector rod.

5. The welding jig for a radiator integrated capacitor module according to claim 1, characterized in that: A welding groove corresponding to the capacitor is provided on the radiator, and the end of the capacitor is connected to the welding groove.

6. The welding jig for a radiator integrated capacitor module according to claim 1, characterized in that: Two heat dissipation windows are provided on the fixture base, and the two heat dissipation windows correspond to the two radiators respectively.

7. A welding jig for a heat sink integrated capacitor module according to any one of claims 1 to 6, characterized in that: A movable slide is installed on the fixture base, a lifting guide column is set on the slide, the lifting guide column is equipped with a pressure plate and a compression spring, a positioning convex strip is set on the pressure plate, the pressure plate is pressed tightly on the two radiators, and the positioning convex strip is pressed tightly on the capacitor.

8. A welding method for a radiator integrated capacitor module, characterized in that: Soldering is performed using the welding jig of the radiator integrated capacitor module according to any one of claims 1 to 7, comprising the following steps: S1, applying flux and solder to the radiator welding groove; S2, installing a radiator on the jig base, and positioning the two sides of the radiator against the horizontal positioning convex edge and the longitudinal positioning convex edge respectively; S3, installing the capacitor on the jig base; S4, installing another radiator on the jig base, and inserting the two ends of the capacitor into the two radiator welding grooves respectively; S5, longitudinally pressing the radiator with the positioning ejector rod; S6, putting the welding jig into the furnace for welding.

9. The welding method of the radiator integrated capacitor module according to claim 8, characterized in that: Before S1, a high-temperature resistant protective film is attached to the outer surface of the radiator.

10. The welding method of the radiator integrated capacitor module according to claim 8, characterized in that: The radiator is made of copper and a silver-plated layer is provided on the outer surface of the radiator.

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