Ultrasonic scanning sealing fixture for power modules

Abstract

This utility model discloses an ultrasonic scanning sealing fixture for power modules, including a positive pressure waterproof sealing box. The positive pressure waterproof sealing box includes an upper cover plate, a sealing box base, sealing box buckles, and sealing box pins. The sealing box buckles are disposed on the upper cover plate, and the sealing box pins are installed on the sealing box base via pins. The pins are equipped with elastic elements for switching the sealing box pins to an engaged state with the sealing box buckles. Multiple sealing box buckles are provided, and each side of the upper cover plate has a sealing box buckle. This utility model's ultrasonic scanning sealing fixture for power modules solves the problem of uneven product locking force by adding multi-sided multi-pin locking and adopting a vertical closing method, making the overall locking consistency and product stress more stable, improving the overall sealing performance of the fixture and the service life of the cover plate.

Description

Technical Field

[0001] This utility model belongs to the field of fixture technology, specifically, it relates to an ultrasonic scanning sealing fixture. Background Technology

[0002] Ultrasonic scanning microscopy (USMS) utilizes the differences in acoustic impedance, absorption, and reflection of ultrasonic waves caused by variations in density within a material's internal structure. This allows for qualitative analysis of internal defects and is widely used in industries such as semiconductor packaging and materials. It can distinguish cracks, voids, bubbles, delamination defects, and impurities within materials and components. USMS is widely used for non-destructive testing of internal defects in various components, SMT (Surface Mount Technology) soldered devices, IGBT (Insulated Gate Bipolar Transistor) devices, MEMS (Micro-Electro-Mechanical Systems) devices, and wafer bonding. It is an important means of providing high-resolution, non-destructive testing and complements X-ray and electron microscopy.

[0003] Current ultrasonic scanning processes require water as a medium to transmit ultrasonic waves in order to ensure image quality and detection results. Simultaneously, to protect critical components such as the IGBT module chip from water contamination, the IGBT module needs to be housed in a well-sealed waterproof enclosure, preventing contact between the chip and DBC bonding layer and water, with only the module's heatsink exposed to receive ultrasonic waves (see...). Figure 12 ).

[0004] The existing ultrasonic scanning sealing fixture is designed as follows: a normal pressure sealing box + manual single-sided buckle locking. This existing technology has the following drawbacks:

[0005] 1. Uneven stress on the cover plate, resulting in a short lifespan: The cover plate is hinged to the base on one side (see...). Figure 13 and Figure 14 When the cover moves in an arc shape (not a vertical straight line) after the product is placed and pressed, the product on the side closer to the hinge contacts the inside of the cover and is subjected to force first, while the product on the other side does not contact the cover. This results in uneven force on both the product and the cover after pressing, making the cover prone to deformation and short life (poor sealing and water leakage). The side of the product that is subjected to severe force is prone to leaving marks on the sealing strip.

[0006] 2. Poor consistency of single-sided buckle engagement: The cover plate and base plate buckle adopt a single-sided three-buckle design (see...). Figure 15This results in the other three sides lacking adequate locking force, leading to poor overall stress consistency (and making it prone to water leakage). Furthermore, a multi-sided locking design would increase the difficulty and workload of manual operation, and this design is incompatible with automated operations. Additionally, after prolonged use, moisture can easily penetrate the fixture, causing oxidation and discoloration of the product.

[0007] Chinese patent application number 202310294363.X discloses an ultrasonic scanning fixture, including a base plate for placement on a support plate in the water tank of an ultrasonic scanner. The base plate is provided with a first limiting block and a second limiting block, which are respectively adjacent to the side walls of the base plate, and the first and second limiting blocks limit the side edges of the frame that fixes the plastic seal. However, the technical solution disclosed in this patent document also fails to solve the aforementioned defects.

[0008] An ultrasonic scanning sealing fixture for power modules is provided, particularly concerning how to improve service life. Utility Model Content

[0009] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an ultrasonic scanning sealing fixture for power modules, with the purpose of improving service life.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an ultrasonic scanning sealing fixture for power modules, including a positive pressure waterproof sealing box. The positive pressure waterproof sealing box includes an upper cover plate, a sealing box base, a sealing box buckle, and a sealing box latch. The sealing box buckle is disposed on the upper cover plate, and the sealing box latch is installed on the sealing box base through a pin. An elastic element is provided on the pin for switching the sealing box latch to a state of engagement with the sealing box buckle. Multiple sealing box buckles are provided, and each side of the upper cover plate is provided with a sealing box buckle.

[0011] The sealing box base is provided with a positioning groove, and a support column is provided in the positioning groove to provide support for the power module. Multiple support columns are provided.

[0012] The sealing box base is provided with an inflation port that cooperates with the inflation device, and the sealing box base is provided with an air passage that communicates with the inflation port. The air passage is connected to the positioning groove.

[0013] A one-way shut-off valve is installed in the inflation port.

[0014] The sealing box base is provided with an assembly guide device for guiding the upper cover plate.

[0015] The sealing box base is provided with a sealing strip for sealing with the upper cover plate.

[0016] An actuator is provided on the base of the sealing box to control the rotation of the sealing box latch.

[0017] The actuator is a cylinder.

[0018] The upper cover is made of metal.

[0019] The sealing box buckle is made of metal, and the sealing box buckle is provided with a slot for the sealing box pin to be inserted.

[0020] The ultrasonic scanning sealing fixture for power modules of this utility model solves the problem of uneven product locking force by adding multi-sided multi-pin locking and adopting a vertical closing method, so as to make the overall locking consistency and product stress more stable, and improve the overall sealing performance of the fixture and the service life of the cover plate. Attached Figure Description

[0021] This manual includes the following figures, which illustrate the following:

[0022] Figure 1 This is a schematic diagram of the structure of the ultrasonic scanning sealing fixture for the power module of this utility model;

[0023] Figure 2 This is a schematic diagram showing the engagement of the positive pressure waterproof sealing box latch and the cylinder;

[0024] Figure 3 This is a schematic diagram showing the fit between the sealing box latch and the sealing box opening;

[0025] Figure 4 This is a schematic diagram showing the interaction between the positive pressure waterproof sealing box and the inflation device;

[0026] Figure 5 This is the overall assembly drawing of the positive pressure waterproof sealing box;

[0027] Figure 6 This is an overall view of the positive pressure waterproof sealing box base;

[0028] Figure 7 This is a schematic diagram of the sealing box locking pin installation structure;

[0029] Figure 8 This is a schematic diagram of the assembly guide device structure;

[0030] Figure 9 This is a diagram showing the mounting of the positive pressure waterproof sealing box base;

[0031] Figure 10 This is a diagram showing the mounting of the sealed box base;

[0032] Figure 11 This is an overall view of the top cover.

[0033] Figure 12 It is a schematic diagram of the scanning principle;

[0034] Figure 13 This is an overall view of the atmospheric pressure scanning sealed box;

[0035] Figure 14 This is a left-side view of the atmospheric pressure scanning sealed box;

[0036] Figure 15 This is a right-side view of the atmospheric pressure scanning sealed box;

[0037] Figure 16 This is a front view of the atmospheric pressure scanning sealed box;

[0038] The markings in the diagram are as follows: 1. Ultrasonic scanning probe; 2. Scanning motion direction; 3. Waterproof sealing box; 4. Equipment water tank; 5. Waterproof sealing box base; 6. Waterproof sealing box buckle; 7. Waterproof sealing box cover; 8. Power module (product); 9. Waterproof sealing box handle; 10. Waterproof sealing box hinge; 11. Opening device; 12. Slide rail; 13. Positive pressure waterproof sealing box; 14. Actuator; 15. Automated handling base; 16. Inflation device; 17. Top cover; 18. Sealing box buckle; 19. Power module; 20. Sealing box locking pin; 21. Inflation port; 22. Cover separation device; 23. Sealing box base; 24. Base separation device; 25. Assembly guide device; 26. Support column; 27. Sealing strip; 28. Pin; 29. ​​Elastic element. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0040] like Figures 1 to 11 As shown, this utility model provides an ultrasonic scanning sealing fixture for a power module, including a positive pressure waterproof sealing box. The positive pressure waterproof sealing box includes an upper cover plate 17, a sealing box base 23, a sealing box buckle 18, and a sealing box pin 20. The upper cover plate 17 cooperates with the sealing box base 23 to clamp the power module. The upper cover plate 17 is located above the sealing box base 23. The sealing box buckle 18 is disposed on the upper cover plate 17. The sealing box pin 20 is installed on the sealing box base 23 through a pin 28. The pin 28 is provided with an elastic element 29 for switching the sealing box pin 20 to a state of engagement with the sealing box buckle 18. Multiple sealing box buckles 18 are provided, and each side of the upper cover plate 17 is provided with a sealing box buckle 18.

[0041] Specifically, such as Figure 5 and Figure 6As shown, the sealing box base 23 is provided with positioning grooves, and multiple positioning grooves are provided. Support columns 26 for supporting the power module are provided within the positioning grooves. Multiple support columns 26 are provided, and the support columns 26 are vertically arranged. Positioning holes are provided on the power module for inserting the upper ends of the support columns 26. The sealing box base 23 has a rectangular structure, and sealing box latches 20 are provided on the four sides of the sealing box base 23. Each sealing box latch 20 cooperates with a sealing box buckle 18.

[0042] Preferably, the support column 26 and the sealing box base 23 are threadedly connected. The sealing box base 23 is provided with threaded holes. The support column 26 adopts a single metal thread locking design, which can realize the ability to suspend the product after assembly (to avoid collision of components). At the same time, the single thread design makes it easy to replace and adjust, reducing subsequent maintenance costs and difficulties.

[0043] During use, the automated robotic arm places each power module (product) onto the support column 26 of the positive pressure waterproof sealing box in a certain direction, so that the product is suspended in the air to protect the components on the front of the product.

[0044] As a preferred option, the sealing box base 23 is made of a single piece of metal through CNC machining, which greatly improves the sealing performance and precision of the fixture.

[0045] Preferably, the sealing box latch 20 is made of metal, and has a through hole for the pin 28 to pass through. The elastic element 29 is a torsion spring, which utilizes the elasticity of the torsion spring to achieve automatic springback and locking of the sealing box latch 20, solving the problems of manual latching and large amount of operation. At the same time, the design of multiple edges and multiple positions of the latch is evenly distributed, making the fit between the latch and the upper cover plate 17 more uniform, the deformation of the sealing box more stable, and effectively improving the life of the sealing box and the sealing performance.

[0046] like Figure 6 and Figure 9 As shown, a sealing strip 27 for sealing with the upper cover plate 17 is provided on the sealing box base 23. The sealing strip 27 is designed as a single piece of silicone, which greatly improves the overall wear resistance, corrosion resistance, high temperature resistance and service life. The sealing strip 27 is sandwiched between the upper cover plate 17 and the sealing box base 23 to achieve a seal between the upper cover plate 17 and the sealing box base 23. All the positioning grooves on the sealing box base 23 are located on the inner side of the sealing strip 27, and the sealing box locking pins 20 are distributed on the outer periphery of the sealing strip 27.

[0047] like Figure 6 and Figure 9As shown, the sealing box base 23 is provided with an assembly guide device 25 for guiding the upper cover plate 17. The assembly guide device 25 consists of vertically arranged guide pins, and multiple guide pins are provided, distributed around the outer perimeter of the sealing strip 27. The assembly guide device 25 reduces the difficulty of subsequent upper cover plate 17 fastening operations and improves assembly position accuracy.

[0048] like Figure 1 and Figure 4 As shown, the sealing box base 23 is provided with an inflation port 21 that cooperates with the inflation device 16. An air passage communicating with the inflation port 21 is provided inside the sealing box base 23, and the air passage is connected to the positioning recesses. The inflation device 16 supplies nitrogen gas into the sealing box base 23, and the air passage guides the nitrogen gas to each positioning recess, enabling nitrogen protection of the product against oxidation. The internal air passage design effectively reduces the overall weight of the sealing box, facilitating handling by personnel or equipment and reducing labor intensity.

[0049] Preferably, a one-way shut-off valve is provided in the air inlet 21. The addition of a one-way shut-off valve to the air inlet 21, in conjunction with the air filling device 16, enables nitrogen filling, which can effectively improve the product's anti-oxidation ability when immersed in water during ultrasonic scanning and prevent the product from becoming damp, oxidized, or discolored.

[0050] like Figure 2 and Figure 3 As shown, an actuator 14 is provided on the sealing box base 23 to control the rotation of the sealing box latch 20. Preferably, the actuator 14 is a cylinder, which is installed at the bottom of the sealing box base 23, with its end contacting the lower end of the sealing box latch 20. When unlocking is required, the actuator 14 controls the sealing box latch 20 to rotate around the pin 28, causing the upper end of the sealing box latch 20 to separate from the sealing box buckle 18. After the actuator 14 separates from the sealing box latch 20, the sealing box latch 20 can automatically reset under the elastic force of the elastic element 29. The sealing box latch 20 automatically engages using the spring elasticity principle, and works in conjunction with the cylinder latch to open, enabling automated operation.

[0051] Preferably, the upper cover plate 17 is made of metal. The upper cover plate 17 is integrally formed from a single piece of metal through CNC machining, which effectively improves the sealing performance and precision of the sealing box.

[0052] Preferably, the sealing box buckle 18 is made of metal, and the sealing box buckle 18 is provided with a slot for the sealing box pin 20 to be inserted. The sealing box buckle 18 and the sealing box pin 20 are distributed in corresponding positions to improve the consistency of the fixture buckles and reduce the maintenance cost of the fixture in the later stage.

[0053] During use, an automated robotic arm vertically fastens the top cover 17 onto the sealing box base 23 in a certain direction. Under the action of air pressure, all the buckles on each side are fully engaged. The bottom surface of the top cover 17 is attached to the top surface of the power module's four edges. The top cover 17 is also attached to the sealing strip 27 to achieve a seal, ensuring that the power module is completely sealed except for the exposed surface. The top cover 17 is provided with a window to expose the exposed surface of the power module, preventing water seepage and contamination of the product during ultrasonic scanning when immersed in water.

[0054] The ultrasonic scanning sealing fixture for the power module with the above structure is used as follows:

[0055] 1. Place the sealed box base 23, already loaded with the product, onto the equipment. The automated equipment aligns the top cover 17 with the snap-fit ​​positions and presses it down, ensuring that all the snap-fit ​​pins are fully engaged, achieving a complete seal inside the sealed box. Simultaneously, the inflation nozzle of the inflation device 16 extends through the cylinder and aligns with the inflation port 21 of the sealed box, injecting an appropriate amount of nitrogen into the sealed box base 23. This maintains a certain positive pressure atmosphere inside the sealed box, providing nitrogen protection against oxidation and leakage.

[0056] 2. After the ultrasonic scan is completed, the mechanical device of the equipment presses down the cover plate, and the corresponding cylinder extends to press against the sealing box latch 20 to fully open it. At this time, the automated robot arm rises and removes the upper cover plate 17. After the upper cover plate 17 is in place, the cylinder retracts, and the sealing box latch 20 springs back to its original position under the action of the spring, waiting for the next cover plate pressing.

[0057] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An ultrasonic scan sealing jig for power modules, characterized by: The system includes a positive pressure waterproof sealing box, which comprises a top cover, a sealing box base, a sealing box buckle, and a sealing box latch. The sealing box buckle is mounted on the top cover, and the sealing box latch is mounted on the sealing box base via a pin. The pin is equipped with an elastic element for switching the sealing box latch to a locking state with the sealing box buckle. Multiple sealing box buckles are provided, and each side of the top cover is provided with a sealing box buckle.

2. The ultrasonic scan sealing jig for a power module according to claim 1, characterized by: The sealing box base is provided with a positioning groove, and a support column is provided in the positioning groove to provide support for the power module. Multiple support columns are provided.

3. The ultrasonic scan sealing jig for a power module according to claim 2, characterized by: The sealing box base is provided with an inflation port that cooperates with the inflation device, and the sealing box base is provided with an air passage that communicates with the inflation port. The air passage is connected to the positioning groove.

4. The ultrasonic scanning sealing jig for a power module according to claim 3, characterized by: A one-way shut-off valve is installed in the inflation port.

5. The ultrasonic scanning sealing jig for a power module according to any one of claims 1 to 4, characterized by: The sealing box base is provided with an assembly guide device for guiding the upper cover plate.

6. The ultrasonic scanning sealing jig for a power module according to any one of claims 1 to 4, characterized by: The sealing box base is provided with a sealing strip for sealing with the upper cover plate.

7. The ultrasonic scanning sealing jig for a power module according to any one of claims 1 to 4, characterized by: An actuator is provided on the base of the sealing box to control the rotation of the sealing box latch.

8. The ultrasonic scanning sealing jig for a power module according to claim 7, characterized by: The actuator is a cylinder.

9. The ultrasonic scanning sealing jig for a power module according to any one of claims 1 to 4, characterized by: The upper cover is made of metal.

10. The ultrasonic scanning sealing jig for a power module according to any one of claims 1 to 4, characterized by: The sealing box buckle is made of metal, and the sealing box buckle is provided with a slot for the sealing box pin to be inserted.

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