Negative pressure packaging method of aluminum electrolytic capacitor

Abstract

The invention discloses a negative-pressure packaging method for an aluminum electrolytic capacitor, and relates to the field of capacitors, and the method comprises the following steps: enabling an element to penetrate through sealing rubber, and putting the element into an aluminum shell, so as to form a to-be-packaged aluminum electrolytic capacitor; packaging the aluminum electrolytic capacitor by using the negative pressure accommodating mechanism; the negative pressure containing mechanism comprises a negative pressure cylinder, an upper cover, a lower cover, a first pressing rod and a second pressing rod, and a sealing plate is arranged at the upper end of the second pressing rod; the negative pressure cylinder is provided with an air exhaust hole communicated with the vacuumizing pipeline, and the moving stroke of the sealing plate in the negative pressure cylinder passes through the air exhaust hole; when the aluminum electrolytic capacitor is packaged by the negative pressure containing mechanism, the sealing plate is moved to the position above the air exhaust hole; the upper cover and the first pressing rod are moved upwards to leave the negative pressure cylinder, and the aluminum electrolytic capacitor is placed in the negative pressure cylinder; the upper cover and the first pressing rod jointly seal an upper end opening of the negative pressure cylinder. The sealing plate moves downwards to the position below the air exhaust hole; the first pressing rod and the second pressing rod jointly extrude and package the aluminum electrolytic capacitor. The vacuum pumping energy consumption in negative pressure packaging can be reduced.

Description

Technical Field

[0001] This application relates to the field of capacitors, and more particularly to a negative voltage encapsulation method for aluminum electrolytic capacitors. Background Technology

[0002] Aluminum electrolytic capacitors are a common type of capacitor. Their main components include an aluminum casing, a capacitor core, and sealing rubber. The sealing rubber encapsulates the core inside the aluminum casing. Traditionally, aluminum electrolytic capacitors are packaged under normal pressure. The sealing rubber seals the opening of the aluminum casing, keeping the inner cavity sealed. However, as the sealing rubber is inserted into the aluminum casing, air inside the casing expands under pressure and is forced out through the sealing surface between the rubber and the casing. This process negatively impacts the structure of both the sealing rubber and the aluminum casing, thus affecting the lifespan of the aluminum electrolytic capacitor.

[0003] Patent CN114823152B discloses a negative pressure encapsulation method for aluminum electrolytic capacitors, comprising: inserting a core into a sealing body; placing the core, sealing body, and outer shell into the inner cavity of a receiving mechanism and sealing the receiving mechanism; evacuating the inner cavity of the receiving mechanism to create a negative pressure state; encapsulating the sealing body and outer shell so that the sealing body is located at a first depth of the outer shell; and pressing the sealing body and outer shell together so that the sealing body is located at a second depth of the outer shell, the second depth being closer to the bottom end of the outer shell relative to the first depth.

[0004] The above technical solution encapsulates aluminum electrolytic capacitors under negative pressure. Each time the capacitor is encapsulated, the core, sealing body and outer shell are placed into the inner cavity of the accommodating mechanism and the accommodating mechanism is sealed. After that, the accommodating mechanism needs to be evacuated, which results in a large workload for the vacuuming equipment and excessive energy consumption for vacuuming. Summary of the Invention

[0005] To address the problem of excessive energy consumption during vacuuming in the negative pressure encapsulation process of aluminum electrolytic capacitors, this application provides a negative pressure encapsulation method for aluminum electrolytic capacitors.

[0006] The negative voltage encapsulation method for aluminum electrolytic capacitors provided in this application adopts the following technical solution: A negative pressure encapsulation method for an aluminum electrolytic capacitor includes the following steps: inserting a component into a sealing rubber, then placing the component into an aluminum shell to form the aluminum electrolytic capacitor to be encapsulated; encapsulating the aluminum electrolytic capacitor using a negative pressure containment mechanism; the negative pressure containment mechanism includes a negative pressure cylinder, an upper cover, a lower cover, a first pressure rod, and a second pressure rod. The upper cover is used to close the upper port of the negative pressure cylinder, and the lower cover is used to close the lower port of the negative pressure cylinder. The upper cover, the first pressure rod, and the second pressure rod are all capable of vertical movement. The first pressure rod is connected to the upper cover, and the second pressure rod is connected to the lower cover. The first pressure rod and the second pressure rod can jointly compress the encapsulated aluminum electrolytic capacitor. A sealing plate is provided at the upper end of the second pressure rod, and the sealing plate is in a sealing fit with the inner wall of the negative pressure cylinder. The negative pressure cylinder has a vacuum pipe connected to its wall, and the negative pressure cylinder has an air extraction hole that communicates with the vacuum pipe. The sealing plate moves through the air extraction hole within the negative pressure cylinder. The vacuum pipe is used to connect to a vacuum generating device. When the negative pressure housing mechanism encapsulates the aluminum electrolytic capacitor, the sealing plate is first moved above the air extraction hole. Then, the upper cover and the first pressure rod are moved upward away from the negative pressure cylinder, and the aluminum electrolytic capacitor is placed inside the negative pressure cylinder. Next, the upper cover and the first pressure rod jointly seal the upper port of the negative pressure cylinder. Then, the sealing plate is moved downward below the air extraction hole. Next, the first pressure rod and the second pressure rod jointly squeeze and encapsulate the aluminum electrolytic capacitor. Afterward, the sealing plate is moved back above the air extraction hole, and the upper cover and the first pressure rod are moved upward away from the negative pressure cylinder again to remove the encapsulated aluminum electrolytic capacitor.

[0007] By adopting the above technical solution, during the insertion and removal of the aluminum electrolytic capacitor from the negative pressure cylinder, the sealing plate effectively separates the evacuation port from the outer space of the negative pressure cylinder, ensuring that the inner cavity of the negative pressure cylinder remains under negative pressure. After the top cover leaves the negative pressure cylinder, the fluctuation of the negative pressure environment inside the cylinder is minimal, significantly reducing the workload of the vacuum generator in evacuating the inner cavity of the negative pressure cylinder, thus reducing the energy consumed in vacuuming. Furthermore, during the encapsulation of the aluminum electrolytic capacitor, the sealing plate retracts below the evacuation port, placing the aluminum electrolytic capacitor under the required negative pressure environment, thus meeting the requirements for encapsulation under negative pressure.

[0008] Optionally, the downward speed of the first pressure bar is greater than the downward speed of the second pressure bar, and the upward speed of the second pressure bar is greater than the upward speed of the first pressure bar; when encapsulating aluminum electrolytic capacitors, the negative pressure accommodating mechanism first applies pressure by simultaneously lowering the first pressure bar and the second pressure bar, and then applies pressure by simultaneously raising the first pressure bar and the second pressure bar.

[0009] By adopting the above technical solution, when the first and second pressure rods move downwards simultaneously, there is a speed difference between them, causing them to exert a squeezing effect on the aluminum electrolytic capacitor. When the first and second pressure rods move upwards simultaneously, there is a speed difference between them, causing them to exert a squeezing effect on the aluminum electrolytic capacitor. This segmented squeezing effect helps to reduce excessive frictional heat generated by excessively fast encapsulation, thus protecting the aluminum electrolytic capacitor.

[0010] Optionally, the difference between the downward speed of the first pressure bar and the downward speed of the second pressure bar is less than the difference between the upward speed of the first pressure bar and the upward speed of the second pressure bar.

[0011] By adopting the above technical solution, the negative pressure accommodating mechanism essentially forms a two-stage encapsulation of the aluminum electrolytic capacitor. In the second stage of encapsulation, the speed difference between the first and second pressure rods is greater, and the squeezing force is relatively greater.

[0012] Optionally, the downward speed of the first pressure bar is greater than that of the second pressure bar. When the negative pressure accommodating mechanism encapsulates the aluminum electrolytic capacitor, it first applies pressure by simultaneously pressing down on the first and second pressure bars. During the process of applying pressure by simultaneously pressing down on the first and second pressure bars, the second pressure bar stops before the first pressure bar and moves upward, so that the first and second pressure bars squeeze the aluminum electrolytic capacitor in opposite directions.

[0013] By adopting the above technical solution, when the first and second pressure rods descend simultaneously, there is a speed difference between them, causing them to exert a squeezing effect on the aluminum electrolytic capacitor. When the second pressure rod stops before the first and then reverses direction, the first and second pressure rods exert a greater opposing squeezing effect on the aluminum electrolytic capacitor. The first and second pressure rods form a segmented squeezing and encapsulating effect on the aluminum electrolytic capacitor.

[0014] Optionally, when encapsulating aluminum electrolytic capacitors, the second pressure rod of the negative pressure accommodating mechanism moves up and down in a spiral rotation manner.

[0015] By adopting the above technical solution, the second pressure rod moves up and down in a spiral rotation manner, which enables the second pressure rod to drive the sealing rubber into the negative pressure cylinder in a spiral rotation manner, which makes it easier for the sealing rubber to enter the negative pressure cylinder.

[0016] Optionally, the inner hole of the negative pressure cylinder includes an upper hole section and a lower hole section. The inner diameter of the upper hole section is smaller than the inner diameter of the lower hole section. The upper hole section can be sealed with the sealing plate, and the lower hole section can maintain a clearance fit with the sealing plate.

[0017] By adopting the above technical solution, the sealing plate is less likely to rub against the inner wall of the negative pressure cylinder when it moves in the lower hole section of the negative pressure cylinder, which helps to reduce the resistance of the second pressure rod's lifting and lowering movement.

[0018] Optionally, the lower surface of the upper cover plate is provided with a spiral positioning coil. The spiral positioning coil is elastic and is coaxially arranged with both the first pressure rod and the second pressure rod. The spiral positioning coil is used to position the aluminum electrolytic capacitor. The lower end of the spiral positioning coil is provided with a trumpet-shaped guide structure with the large end of the guide structure facing downward. The guide structure is used to guide the aluminum electrolytic capacitor into the spiral positioning coil.

[0019] By adopting the above technical solution, and with the helical positioning coil in place, a larger gap can be formed between the aluminum electrolytic capacitor and the inner wall of the negative pressure cylinder, which is beneficial for heat dissipation of the aluminum electrolytic capacitor. Compared to the inner wall of the negative pressure cylinder, the helical positioning coil is less likely to have a significant impact on the heat dissipation of the aluminum electrolytic capacitor.

[0020] Optionally, the upper cover is provided with a semiconductor cooling chip, and a heat insulation structure is provided between the semiconductor cooling chip and the upper cover. One end of the spiral positioning coil passes through the upper cover and is connected to the cold end of the semiconductor cooling chip.

[0021] By adopting the above technical solution, the cold end of the semiconductor cooling chip can cool the spiral positioning coil, and the spiral positioning coil can abut against the aluminum electrolytic capacitor, so that the spiral positioning coil can cool the aluminum electrolytic capacitor. At the same time, the spiral positioning coil can also cool the inner cavity of the negative pressure cylinder.

[0022] Optionally, the surface of the spiral positioning coil is provided with a nano-hydrophobic layer.

[0023] By adopting the above technical solution, a nano-hydrophobic layer is set on the surface of the spiral positioning coil, so that liquid water does not easily condense and adhere to the surface of the spiral positioning coil after it leaves the negative pressure cylinder with the top cover, and the spiral positioning coil does not easily accumulate liquid water in the negative pressure cylinder.

[0024] Optionally, the vacuum pipeline is equipped with a negative pressure buffer tank.

[0025] By adopting the above technical solution and setting up a negative pressure buffer tank, the negative pressure state of the negative pressure cylinder, the vacuum pipeline and the negative pressure generating device can be stabilized, which helps to reduce the fluctuation of the negative pressure state of the vacuum pipeline and thus helps to protect the negative pressure generating device.

[0026] In summary, this application includes at least one of the following beneficial technical effects: During the process of placing and removing the aluminum electrolytic capacitor into and from the negative pressure cylinder, the sealing plate can separate the evacuation port from the outer space of the negative pressure cylinder, so that the inner cavity of the negative pressure cylinder can always maintain a negative pressure state. After the top cover leaves the negative pressure cylinder, the negative pressure environment inside the negative pressure cylinder fluctuates less, and the workload of the vacuum generator to evacuate the inner cavity of the negative pressure cylinder is greatly reduced, which helps to reduce the energy consumed in vacuuming.

[0027] The first and second pressure bars exert segmented pressure on the aluminum electrolytic capacitor, which helps to reduce excessive frictional heat generated by rapid encapsulation, thus protecting the aluminum electrolytic capacitor. Attached Figure Description

[0028] Figure 1 This is a schematic flowchart of the negative voltage encapsulation method for the aluminum electrolytic capacitor in Example 1.

[0029] Figure 2 This is a schematic diagram of Example 1 illustrating the state of an aluminum electrolytic capacitor placed in a negative pressure accommodating mechanism.

[0030] Figure 3 This is a schematic diagram of Example 1 illustrating the state in which the first and second pressure rods jointly compress the aluminum electrolytic capacitor.

[0031] Figure 4 This is a schematic diagram of the installation state of the buffer tank in Example 1.

[0032] Figure 5 This is a schematic diagram of the negative pressure accommodating mechanism in Example 4.

[0033] Figure 6 This is a schematic diagram of Example 5 illustrating the state of the aluminum electrolytic capacitor positioned by the spiral positioning coil.

[0034] Figure 7 This is a schematic diagram of Example 5 illustrating the state in which the first and second pressure rods jointly compress the aluminum electrolytic capacitor.

[0035] Explanation of reference numerals in the attached figures: 1. Aluminum electrolytic capacitor; 11. Element; 12. Sealing rubber; 13. Aluminum shell; 2. Negative pressure containment mechanism; 21. Negative pressure cylinder; 211. Air extraction port; 212. Upper hole section; 213. Lower hole section; 22. Top cover; 221. First through hole; 222. First annular groove; 223. First sealing ring; 23. Bottom cover; 231. Second through hole; 232. Second annular groove; 233. Second sealing ring; 24. First pressure... 241. Rod; 242. Prismatic section; 243. Lead screw section; 244. Optical axis section; 245. Sleeve; 246. Lead screw nut; 247. Annular clearance groove; 28. Second pressure rod; 29. ​​Sealing plate; 201. Third annular groove; 202. Third sealing ring; 203. Vacuum pipeline; 21. Buffer tank; 22. Spiral positioning coil; 23. Guide structure; 4. Servo motor; 5. Semiconductor cooling chip; 54. Heat insulation structure. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0037] Example 1: This application discloses a negative voltage encapsulation method for aluminum electrolytic capacitors. (Refer to...) Figures 1-4 The negative voltage encapsulation method for aluminum electrolytic capacitors includes the following steps: Step 1: Insert element 11 through sealing rubber 12, and then put element 11 into aluminum shell 13 to form aluminum electrolytic capacitor 1 to be packaged. Step 2: Encapsulate the aluminum electrolytic capacitor 1 using the negative pressure accommodating mechanism 2; Reference Figure 2 and Figure 3 The negative pressure accommodating mechanism 2 includes a negative pressure cylinder 21, an upper cover 22, a lower cover 23, a first pressure rod 24, and a second pressure rod 25. The upper cover 22 is used to close the upper port of the negative pressure cylinder 21, and the lower cover 23 is used to close the lower port of the negative pressure cylinder 21. In this embodiment, the lower cover 23 is kept closed to the lower end of the negative pressure cylinder 21. The upper cover 22, the first pressure rod 24, and the second pressure rod 25 can all move up and down. The upper cover 22, the first pressure rod 24, and the second pressure rod 25 are each driven by a linear drive component. The drive component can be a linear module, a hydraulic cylinder, or a pneumatic cylinder, etc. The first pressure rod 24 is connected to the upper cover 22. The upper cover 22 has a first through hole 221 through which the first pressure rod 24 passes. The inner wall of the first through hole 221 has a first annular groove 222. The upper cover 22 is fitted with a first sealing ring 223 through the first annular groove 222. The first sealing ring 223 is used to seal the fit gap between the first pressure rod 24 and the first through hole 221. The second pressure rod 25 is connected to the lower cover 23. The lower cover 23 has a second through hole 231 through which the second pressure rod 25 passes. The inner wall of the second through hole 231 has a second annular groove 232. The lower cover 23 is fitted with a second sealing ring 233 through the second annular groove 232. The second sealing ring 233 is used to seal the fit gap between the second pressure rod 25 and the second through hole 231. Reference Figure 3 and Figure 4 The first pressure rod 24 and the second pressure rod 25 can jointly compress and encapsulate the aluminum electrolytic capacitor 1. The lower end face of the first pressure rod 24 needs to be provided with an annular clearance groove 246 to avoid the lead wire of the aluminum electrolytic capacitor 1. The upper end of the second pressure rod 25 is fixedly connected to a sealing plate 26. The outer peripheral surface of the sealing plate 26 has a third annular groove 261. A third sealing ring 262 is provided in the third annular groove 261 of the sealing plate 26. The sealing plate 26 is sealed with the inner wall of the negative pressure cylinder 21 through the third sealing ring 262. The cylinder wall of the negative pressure cylinder 21 is connected to a vacuum pipeline 27. The negative pressure cylinder 21 is provided with a suction hole 211 that communicates with the vacuum pipeline 27. The moving stroke of the sealing plate 26 in the negative pressure cylinder 21 passes through the suction hole 211. The vacuum pipeline 27 is used to connect to a vacuum generating device, which is usually a vacuum pump. The vacuum pipeline 27 is provided with a negative pressure buffer tank 28. The process of encapsulating the aluminum electrolytic capacitor 1 using the negative pressure accommodating mechanism 2 includes the following steps: Step 21: First, move the sealing plate 26 above the air extraction hole 211; Step 22: Move the upper cover 22 and the first pressure rod 24 upward away from the negative pressure cylinder 21, and then put the aluminum electrolytic capacitor 1 into the negative pressure cylinder 21. Step 23: Next, the upper cover 22 and the first pressure rod 24 are used together to seal the upper port of the negative pressure cylinder 21; Step 24, then move the sealing plate 26 downwards below the air extraction hole 211; Step 25: Next, the first pressure bar 24 and the second pressure bar 25 are used together to press and encapsulate the aluminum electrolytic capacitor 1. Step 26: Afterwards, move the sealing plate 26 back above the vent 211, and move the upper cover 22 and the first pressure rod 24 up away from the negative pressure cylinder 21 again to remove the packaged aluminum electrolytic capacitor 1; when removing the aluminum electrolytic capacitor 1, the sealing plate 26 can be moved up to a position flush with or higher than the upper port of the negative pressure cylinder 21.

[0038] The implementation principle of the negative pressure encapsulation method for an aluminum electrolytic capacitor according to an embodiment of this application is as follows: During the process of placing and removing the aluminum electrolytic capacitor 1 into the negative pressure cylinder 21, the sealing plate 26 can separate the evacuation hole 211 from the outer space of the negative pressure cylinder 21, so that the inner cavity of the negative pressure cylinder 21 can always maintain a negative pressure state. After the top cover 22 leaves the negative pressure cylinder 21, the fluctuation of the negative pressure environment inside the negative pressure cylinder 21 is small, and the workload of the vacuum generator to evacuate the inner cavity of the negative pressure cylinder 21 is greatly reduced, which helps to reduce the energy consumed in vacuuming. During the encapsulation of the aluminum electrolytic capacitor 1, the sealing plate 26 retracts to below the evacuation hole 211, so that the aluminum electrolytic capacitor 1 is in the required negative pressure environment, which meets the requirements of encapsulation under negative pressure environment.

[0039] Example 2 differs from Example 1 in that: In step 25, the downward speed of the first pressure rod 24 is greater than the downward speed of the second pressure rod 25, and the upward speed of the second pressure rod 25 is greater than the upward speed of the first pressure rod 24; the difference between the downward speed of the first pressure rod 24 and the downward speed of the second pressure rod 25 is less than the difference between the upward speed of the first pressure rod 24 and the upward speed of the second pressure rod 25. When encapsulating the aluminum electrolytic capacitor 1, the negative pressure accommodating mechanism 2 first applies pressure downwards simultaneously with the first pressure rod 24 and the second pressure rod 25, and then applies pressure upwards simultaneously with the first pressure rod 24 and the second pressure rod 25.

[0040] When the first pressure rod 24 and the second pressure rod 25 move downwards simultaneously, there is a speed difference between them, causing them to exert a squeezing effect on the aluminum electrolytic capacitor 1. When they move upwards simultaneously, there is a speed difference between them, causing them to exert a squeezing effect on the aluminum electrolytic capacitor 1. This segmented squeezing effect helps to reduce excessive frictional heat generated during rapid encapsulation, thus protecting the aluminum electrolytic capacitor 1. Furthermore, encapsulation is achieved during the simultaneous movement of the first pressure rod 24 and the second pressure rod 25, which extends the actual encapsulation squeezing time, further reducing frictional heat generated during the encapsulation process.

[0041] Example 3 differs from Example 1 in that: In step 25, the downward speed of the first pressure rod 24 is greater than the downward speed of the second pressure rod 25, and the upward speed of the second pressure rod 25 is greater than the upward speed of the first pressure rod 24. When encapsulating the aluminum electrolytic capacitor 1, the negative pressure accommodating mechanism 2 first applies pressure downwards simultaneously with the first pressure rod 24 and the second pressure rod 25, and then applies pressure upwards simultaneously with the first pressure rod 24 and the second pressure rod 25. During the process of applying pressure downwards simultaneously with the first pressure rod 24 and the second pressure rod 25, the second pressure rod 25 pauses before the first pressure rod 24 and then moves upwards, so that the first pressure rod 24 and the second pressure rod 25 press the aluminum electrolytic capacitor 1 against each other.

[0042] Example 4: In this example, the structure of the first pressure rod 24 and the driving component of the first pressure rod 24 are different from those in Example 1. In this example, the driving component of the first pressure rod 24 is a servo motor 4, which is fixedly installed above the upper cover 22.

[0043] Reference Figure 5 The first pressure rod 24 includes, from top to bottom, a prism segment 241, a lead screw segment 242, and an optical axis segment 243. The prism segment 241 can be a square prism or a hexagonal prism, etc. A sleeve 244 is fitted onto the prism segment 241. The inner hole of the sleeve 244 is adapted to the prism segment 241. The sleeve 244 is used to connect the output shaft of the servo motor 4. The lead screw is threadedly connected to a lead screw nut 245. The lead screw nut 245 is fixedly installed in the area between the servo motor 4 and the upper cover 22. The relative positions of the lead screw nut 245, the servo motor 4, and the upper cover 22 are kept fixed. The servo motor 4 applies rotational torque to the first pressure rod 24, causing the first pressure rod 24 to rise and fall spirally, and causing the first pressure rod 24 to press down in a spiral manner.

[0044] In step 25, the second pressure rod 25 moves up and down in a spiral rotation manner, so that the second pressure rod 25 can drive the sealing rubber 12 to be pressed into the negative pressure cylinder 21 in a spiral rotation manner, which makes it easier for the sealing rubber 12 to enter the negative pressure cylinder 21.

[0045] Example 5, refer to Figure 6 and Figure 7 The difference between this embodiment and embodiment 1 is that the inner hole of the negative pressure cylinder 21 includes an upper hole section 212 and a lower hole section 213. The inner diameter of the upper hole section 212 is smaller than the inner diameter of the lower hole section 213. The upper hole section 212 can be sealed with the sealing plate 26, and the lower hole section 213 can maintain a clearance fit with the sealing plate 26.

[0046] Furthermore, a spiral positioning coil 29 is provided on the lower surface of the upper cover 22 plate. The spiral positioning coil 29 is elastic and is coaxially arranged with the first pressure rod 24 and the second pressure rod 25. The spiral positioning coil 29 is used to position the aluminum electrolytic capacitor 1. The lower end of the spiral positioning coil 29 is provided with a trumpet-shaped guide structure 291, with the large end of the guide structure 291 facing downward. The guide structure 291 is used to guide the aluminum electrolytic capacitor 1 into the spiral positioning coil 29. In this embodiment, the guide structure 291 is several spiral coils wound in a trumpet shape by the spiral positioning coil 29; in another embodiment, the guide structure 291 can be set as a trumpet-shaped metal ring.

[0047] Reference Figure 6 The upper cover 22 is equipped with a semiconductor cooling chip 5, and a heat insulation structure 51 is provided between the semiconductor cooling chip 5 and the upper cover 22. The heat insulation structure 51 is an expandable polystyrene board or a phenolic foam board. One end of the spiral positioning coil 29 passes through the upper cover 22 and is connected to the cold end of the semiconductor cooling chip 5. The surface of the spiral positioning coil 29 is provided with a nano-hydrophobic layer.

[0048] The cold end of the semiconductor cooling chip 5 can cool the spiral positioning coil 29, which in turn can come into contact with the aluminum electrolytic capacitor 1, thus cooling the aluminum electrolytic capacitor 1. At the same time, the spiral positioning coil 29 can also cool the inner cavity of the negative pressure cylinder 21.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A negative voltage encapsulation method for an aluminum electrolytic capacitor, characterized in that, Includes the following steps: Insert the element (11) through the sealing rubber (12), and then put the element (11) into the aluminum shell (13) to form the aluminum electrolytic capacitor (1) to be packaged. An aluminum electrolytic capacitor (1) is encapsulated using a negative pressure accommodating mechanism (2). The negative pressure accommodating mechanism (2) includes a negative pressure cylinder (21), an upper cover (22), a lower cover (23), a first pressure rod (24), and a second pressure rod (25). The upper cover (22) is used to close the upper port of the negative pressure cylinder (21), and the lower cover (23) is used to close the lower port of the negative pressure cylinder (21). The upper cover (22), the first pressure rod (24), and the second pressure rod (25) can all move up and down. The first pressure rod (24) is connected to the upper cover (22), and the second pressure rod (25) is connected to the lower cover (23). Then, the first pressure rod (24) and the second pressure rod (25) can jointly squeeze the packaged aluminum electrolytic capacitor (1). The upper end of the second pressure rod (25) is provided with a sealing plate (26), and the sealing plate (26) is sealed to the inner wall of the negative pressure cylinder (21). The cylinder wall of the negative pressure cylinder (21) is connected to a vacuum pipe (27). The negative pressure cylinder (21) is provided with a suction hole (211) that communicates with the vacuum pipe (27). The sealing plate (26) moves through the suction hole (211) in the negative pressure cylinder (21). The vacuum pipe (27) is used to connect to a vacuum generating device. When the negative pressure containment mechanism (2) encapsulates the aluminum electrolytic capacitor (1), firstly, the sealing plate (26) is moved above the vent (211); then the upper cover (22) and the first pressure rod (24) are moved upward away from the negative pressure cylinder (21), and then the aluminum electrolytic capacitor (1) is placed into the negative pressure cylinder (21); then the upper cover (22) and the first pressure rod (24) are used together to seal the upper port of the negative pressure cylinder (21); then the sealing plate (26) is moved downward below the vent (211); next, the first pressure rod (24) and the second pressure rod (25) are used together to squeeze and encapsulate the aluminum electrolytic capacitor (1); then, the sealing plate (26) is moved back above the vent (211), and the upper cover (22) and the first pressure rod (24) are moved upward away from the negative pressure cylinder (21) again, and the encapsulated aluminum electrolytic capacitor (1) is taken out.

2. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: The downward speed of the first pressure rod (24) is greater than the downward speed of the second pressure rod (25), and the upward speed of the second pressure rod (25) is greater than the upward speed of the first pressure rod (24). When the negative pressure accommodating mechanism (2) encapsulates the aluminum electrolytic capacitor (1), it first applies pressure downwards simultaneously with the first pressure rod (24) and the second pressure rod (25), and then applies pressure upwards simultaneously with the first pressure rod (24) and the second pressure rod (25).

3. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 2, characterized in that: The difference between the downward speed of the first pressure bar (24) and the downward speed of the second pressure bar (25) is less than the difference between the upward speed of the first pressure bar (24) and the upward speed of the second pressure bar (25).

4. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: The downward speed of the first pressure rod (24) is greater than that of the second pressure rod (25). When the negative pressure accommodating mechanism (2) encapsulates the aluminum electrolytic capacitor (1), it first makes the first pressure rod (24) and the second pressure rod (25) descend simultaneously to apply pressure. During the process of the first pressure rod (24) and the second pressure rod (25) descending simultaneously to apply pressure, the second pressure rod (25) stops before the first pressure rod (24) and moves upward, so that the first pressure rod (24) and the second pressure rod (25) squeeze the aluminum electrolytic capacitor (1) towards each other.

5. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: When the negative pressure accommodating mechanism (2) encapsulates the aluminum electrolytic capacitor (1), the second pressure rod (25) moves up and down in a spiral rotation manner.

6. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: The inner hole of the negative pressure cylinder (21) includes an upper hole section (212) and a lower hole section (213). The inner diameter of the upper hole section (212) is smaller than the inner diameter of the lower hole section (213). The upper hole section (212) can be sealed with the sealing plate (26), and the lower hole section (213) can maintain a clearance fit with the sealing plate (26).

7. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: The lower surface of the upper cover (22) plate is provided with a spiral positioning coil (29). The spiral positioning coil (29) is elastic and is coaxially arranged with the first pressure rod (24) and the second pressure rod (25). The spiral positioning coil (29) is used to position the aluminum electrolytic capacitor (1). The lower end of the spiral positioning coil (29) is provided with a trumpet-shaped guide structure (291). The large end of the guide structure (291) faces downward. The guide structure (291) is used to guide the aluminum electrolytic capacitor (1) into the spiral positioning coil (29).

8. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 7, characterized in that: The upper cover (22) is provided with a semiconductor cooling chip (5), and a heat insulation structure (51) is provided between the semiconductor cooling chip (5) and the upper cover (22). One end of the spiral positioning coil (29) passes through the upper cover (22) and is connected to the cold end of the semiconductor cooling chip (5).

9. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 8, characterized in that: The surface of the spiral positioning coil (29) is provided with a nano-hydrophobic layer.

10. The negative voltage encapsulation method for an aluminum electrolytic capacitor according to claim 1, characterized in that: The vacuum pipeline (27) is equipped with a negative pressure buffer tank (28).

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