A negative voltage packaging method for aluminum electrolytic capacitors

Abstract

The application discloses a negative pressure packaging method of an aluminum electrolytic capacitor, and relates to the field of capacitors, and comprises the following steps: inserting an element into sealing rubber, and then putting the element into an aluminum shell to form an aluminum electrolytic capacitor to be packaged; and packaging the aluminum electrolytic capacitor by using a negative pressure containing 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 the upper end of the second pressing rod is provided with a sealing plate; the negative pressure cylinder is provided with an air exhaust hole in communication with a vacuumizing pipeline, and the moving stroke of the sealing plate in the negative pressure cylinder passes through the air exhaust hole; when the negative pressure containing mechanism is used for packaging the aluminum electrolytic capacitor, the sealing plate is first moved to above the air exhaust hole; the upper cover and the first pressing rod are moved upward to leave the negative pressure cylinder, the aluminum electrolytic capacitor is put into the negative pressure cylinder, the upper cover and the first pressing rod jointly seal the upper end of the negative pressure cylinder, the sealing plate is moved downward to below the air exhaust hole, and the first pressing rod and the second pressing rod jointly extrude the aluminum electrolytic capacitor to be packaged. The application can reduce the energy consumption of vacuumizing in negative pressure packaging.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of capacitors, in particular to a negative pressure packaging method of an aluminum electrolytic capacitor. BACKGROUND

[0002] The aluminum electrolytic capacitor is a common capacitor, and the main components of the aluminum electrolytic capacitor include an aluminum shell, an element, and a sealing rubber. The sealing rubber encapsulates the element inside the aluminum shell. The conventional packaging method of the aluminum electrolytic capacitor is to package under normal pressure. The sealing rubber seals the opening of the aluminum shell, so that the inner cavity of the aluminum shell is in a sealed state. During the process of extruding the sealing rubber into the aluminum shell, the air in the aluminum shell will be compressed and expanded and then extruded out from the sealing surface between the sealing rubber and the aluminum shell. This process will adversely affect the structure of the sealing rubber and the aluminum shell, thereby affecting the service life of the aluminum electrolytic capacitor product.

[0003] The negative pressure packaging method of the aluminum electrolytic capacitor disclosed in the patent with the authorized announcement number CN114823152B includes placing the element core in the sealing body. The element core, the sealing body, and the shell are placed in the inner cavity of the containing mechanism, and the containing mechanism is sealed. The inner cavity of the containing mechanism is vacuumed to make the inner cavity of the containing mechanism in a negative pressure state. The sealing body and the shell are packaged to make the sealing body located at the first depth of the shell. The sealing body and the shell are pressed to make the sealing body located at the second depth of the shell, and the second depth is closer to the bottom end of the shell than the first depth.

[0004] The above technical solution packages the aluminum electrolytic capacitor under negative pressure. Each time the element core, the sealing body, and the shell are placed in the inner cavity of the containing mechanism, and the containing mechanism is sealed, the containing mechanism needs to be vacuumed, which makes the working load of the vacuuming equipment large and the energy consumption of vacuuming large. SUMMARY

[0005] In order to solve the problem of large energy consumption of vacuuming in the negative pressure packaging process of the aluminum electrolytic capacitor, the present application provides a negative pressure packaging method of an aluminum electrolytic capacitor.

[0006] The negative pressure packaging method of the aluminum electrolytic capacitor provided by the present application adopts the following technical solution:

[0007] The application discloses a negative pressure packaging method for an aluminum electrolytic capacitor, and comprises the following steps: inserting an element into sealing rubber, and then placing the element into an aluminum shell to form an aluminum electrolytic capacitor to be packaged; and packaging the aluminum electrolytic capacitor by using a negative pressure containing 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; the upper cover is used for sealing an upper port of the negative pressure cylinder; the lower cover is used for sealing a lower port of the negative pressure cylinder; the upper cover, the first pressing rod and the second pressing rod can move up and down; the first pressing rod is connected with the upper cover in a penetrating mode; the second pressing rod is connected with the lower cover in a penetrating mode; the first pressing rod and the second pressing rod can jointly extrude the packaged aluminum electrolytic capacitor; an upper end of the second pressing rod is provided with a sealing plate; the sealing plate is in sealing cooperation with an inner wall of the negative pressure cylinder; a cylinder wall of the negative pressure cylinder is connected with a vacuum pumping pipeline; the negative pressure cylinder is provided with an air exhaust hole which is in communication with the vacuum pumping pipeline; a moving stroke of the sealing plate in the negative pressure cylinder passes through the air exhaust hole; and the vacuum pumping pipeline is used for connecting a vacuum generating device; when the negative pressure containing mechanism is used for packaging the aluminum electrolytic capacitor, the sealing plate is first moved to above the air exhaust hole; then the upper cover and the first pressing rod are moved upward to leave the negative pressure cylinder; then the aluminum electrolytic capacitor is placed into the negative pressure cylinder; then the upper cover and the first pressing rod jointly seal the upper port of the negative pressure cylinder; then the sealing plate is moved downward to below the air exhaust hole; then the first pressing rod and the second pressing rod jointly extrude the packaged aluminum electrolytic capacitor; then the sealing plate is moved to above the air exhaust hole again; the upper cover and the first pressing rod are moved upward to leave the negative pressure cylinder; and the packaged aluminum electrolytic capacitor is taken out.

[0008] By adopting the technical scheme, the sealing plate can separate the air exhaust hole from the space outside the negative pressure cylinder during the process of placing and taking out the aluminum electrolytic capacitor from the negative pressure cylinder, so that the inner cavity of the negative pressure cylinder can always keep a negative pressure state; after the upper cover leaves the negative pressure cylinder, the negative pressure environment in the negative pressure cylinder has a small fluctuation, and the vacuum generating device greatly reduces the work load for exhausting the inner cavity of the negative pressure cylinder, which is beneficial to reducing the energy consumed by vacuumizing.

[0009] Optionally, the descending speed of the first pressing rod is greater than the descending speed of the first pressing rod, and the ascending speed of the second pressing rod is greater than the ascending speed of the first pressing rod; when the negative pressure containing mechanism is used for packaging the aluminum electrolytic capacitor, the first pressing rod and the second pressing rod are simultaneously caused to descend to apply pressure, and then the first pressing rod and the second pressing rod are simultaneously caused to ascend to apply pressure.

[0010] By adopting the technical scheme, when the first pressing rod and the second pressing rod descend simultaneously, there is a speed difference between the first pressing rod and the second pressing rod in the descending process, so that the first pressing rod and the second pressing rod generate a pressing effect on the aluminum electrolytic capacitor; when the first pressing rod and the second pressing rod ascend simultaneously, there is a speed difference between the first pressing rod and the second pressing rod in the ascending process, so that the first pressing rod and the second pressing rod generate a pressing effect on the aluminum electrolytic capacitor, and the first pressing rod and the second pressing rod generate a segmented pressing effect on the aluminum electrolytic capacitor, which is beneficial to alleviate the excessive frictional heat caused by rapid packaging, thereby being beneficial to protecting the aluminum electrolytic capacitor.

[0011] Optionally, the difference between the descending speed of the first pressing rod and the descending speed of the second pressing rod is smaller than the difference between the ascending speed of the first pressing rod and the ascending speed of the second pressing rod.

[0012] By adopting the technical scheme, the negative pressure accommodating mechanism substantially forms a two-segment packaging effect on the aluminum electrolytic capacitor, and in the second segment packaging process, the speed difference between the first pressing rod and the second pressing rod is greater, and the pressing force is relatively greater.

[0013] Optionally, the descending speed of the first pressing rod is greater than the descending speed of the second pressing rod, and when the negative pressure accommodating mechanism packages the aluminum electrolytic capacitor, the first pressing rod and the second pressing rod are caused to descend simultaneously, the second pressing rod stops before the first pressing rod in the process of the first pressing rod and the second pressing rod descending simultaneously, and is reversed to ascend, so that the first pressing rod and the second pressing rod press the aluminum electrolytic capacitor in opposite directions.

[0014] By adopting the technical scheme, when the first pressing rod and the second pressing rod descend simultaneously, there is a speed difference between the first pressing rod and the second pressing rod in the descending process, so that the first pressing rod and the second pressing rod generate a pressing effect on the aluminum electrolytic capacitor; when the second pressing rod stops before the first pressing rod and is reversed to ascend, the first pressing rod and the second pressing rod generate a greater pressing effect on the aluminum electrolytic capacitor in opposite directions. The first pressing rod and the second pressing rod form a segmented pressing packaging effect on the aluminum electrolytic capacitor.

[0015] Optionally, when the negative pressure accommodating mechanism packages the aluminum electrolytic capacitor, the second pressing rod moves up and down in a spiral rotation manner.

[0016] By adopting the technical scheme, the second pressing rod moves up and down in a spiral rotation manner, so that the second pressing rod can drive the sealing rubber to be pressed into the negative pressure cylinder in a spiral rotation manner, which is beneficial to the sealing rubber entering the negative pressure cylinder more easily.

[0017] Optionally, the inner hole of the negative pressure cylinder comprises 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 a gap can be maintained between the lower hole section and the sealing plate.

[0018] By adopting the technical scheme, the sealing plate is not prone to friction with the inner wall of the negative pressure cylinder when moving in the lower hole section of the negative pressure cylinder, which is conducive to reducing the resistance of the second pressure rod in lifting movement.

[0019] Optionally, the lower surface of the upper cover plate is provided with a spiral positioning coil, the spiral positioning coil has elasticity, the spiral positioning coil is coaxially arranged with the first pressure rod and the second pressure rod, the spiral positioning coil is used for positioning the aluminum electrolytic capacitor, the lower end of the spiral positioning coil is provided with a horn-shaped guide structure, the large end of the guide structure faces downward, and the guide structure is used for guiding the aluminum electrolytic capacitor into the spiral positioning coil.

[0020] By adopting the technical scheme, under the premise of arranging the spiral positioning coil, a larger gap can be formed between the aluminum electrolytic capacitor and the inner wall of the negative pressure cylinder, which is conducive to heat dissipation of the aluminum electrolytic capacitor. Compared with the inner wall of the negative pressure cylinder, the spiral positioning coil is not prone to greatly affecting heat dissipation of the aluminum electrolytic capacitor.

[0021] Optionally, the upper cover is provided with a semiconductor refrigeration sheet, a heat insulation structure is arranged between the semiconductor refrigeration sheet and the upper cover, and one end of the spiral positioning coil is connected with the cold end of the semiconductor refrigeration sheet after penetrating through the upper cover.

[0022] By adopting the technical scheme, the cold end of the semiconductor refrigeration sheet can cool the spiral positioning coil, the spiral positioning coil can abut against the aluminum electrolytic capacitor, so that the spiral positioning coil can cool the aluminum electrolytic capacitor, and the spiral positioning coil can also cool the inner cavity of the negative pressure cylinder.

[0023] Optionally, the surface of the spiral positioning coil is provided with a nano hydrophobic layer.

[0024] By adopting the technical scheme, the nano hydrophobic layer is arranged on the surface of the spiral positioning coil, so that the surface of the spiral positioning coil is not prone to condensing and attaching liquid water after the spiral positioning coil leaves the negative pressure cylinder, and the spiral positioning coil is not prone to enriching liquid water in the negative pressure cylinder.

[0025] Optionally, the vacuum pipeline is provided with a negative pressure buffer tank.

[0026] By adopting the technical scheme, by arranging the 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 is conducive to reducing fluctuation of the negative pressure state of the vacuum pipeline, thereby being conducive to protecting the negative pressure generating device.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] During the process of putting and taking out the aluminum electrolytic capacitor into and out of the negative pressure cylinder, the sealing plate can play a role in separating the air extraction hole from the outside 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 upper cover leaves the negative pressure cylinder, the negative pressure environment in the negative pressure cylinder fluctuates less, and the work load of the vacuum generating device for extracting air from the inner cavity of the negative pressure cylinder is greatly reduced, which is beneficial to reduce the energy consumed by vacuumizing.

[0029] The first pressing rod and the second pressing rod produce segmented extrusion on the aluminum electrolytic capacitor, which is beneficial to alleviate the excessive friction heat caused by too fast packaging, thereby being beneficial to protect the aluminum electrolytic capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a flowchart of the negative pressure packaging method of the aluminum electrolytic capacitor of embodiment 1.

[0031] Figure 2 is a schematic diagram for embodying the state of the aluminum electrolytic capacitor being put into the negative pressure containing mechanism of embodiment 1.

[0032] Figure 3 is a schematic diagram for embodying the state of the first pressing rod and the second pressing rod extruding the aluminum electrolytic capacitor together of embodiment 1.

[0033] Figure 4 is a schematic diagram of the installation state of the buffer tank in embodiment 1.

[0034] Figure 5 is a structural schematic diagram of the negative pressure containing mechanism in embodiment 4.

[0035] Figure 6 is a schematic diagram for embodying the state of the spiral positioning coil positioning the aluminum electrolytic capacitor of embodiment 5.

[0036] Figure 7 is a schematic diagram for embodying the state of the first pressing rod and the second pressing rod extruding the aluminum electrolytic capacitor together of embodiment 5.

[0037] BRIEF DESCRIPTION OF DRAWINGS:

[0038] 1, aluminum electrolytic capacitor; 11, element; 12, sealing rubber; 13, aluminum shell; 2, negative pressure containing mechanism; 21, negative pressure cylinder; 211, air extraction hole; 212, upper hole section; 213, lower hole section; 22, upper cover; 221, first through hole; 222, first annular groove; 223, first sealing ring; 23, lower cover; 231, second through hole; 232, second annular groove; 233, second sealing ring; 24, first pressing rod; 241, prismatic section; 242, screw rod section; 243, optical axis section; 244, sleeve; 245, screw rod nut; 246, annular avoidance groove; 25, second pressing rod; 26, sealing plate; 261, third annular groove; 262, third sealing ring; 27, vacuum extraction pipeline; 28, buffer tank; 29, helical positioning coil; 291, guide structure; 4, servo motor; 5, semiconductor refrigeration sheet; 51, heat insulation structure. DETAILED DESCRIPTION

[0039] The following will be described in detail in combination with the accompanying drawings. Figures 1-7 The application will be further described in detail.

[0040] Embodiment 1, the application discloses a negative pressure packaging method of an aluminum electrolytic capacitor. Referring to Figures 1-4 , the negative pressure packaging method of the aluminum electrolytic capacitor comprises the following steps:

[0041] Step 1, the element 11 is arranged in the sealing rubber 12, and then the element 11 is placed in the aluminum shell 13 to form an aluminum electrolytic capacitor 1 to be packaged;

[0042] Step 2, the aluminum electrolytic capacitor 1 is packaged by using the negative pressure containing mechanism 2;

[0043] Referring to Figure 2 and Figure 3 , the negative pressure containing mechanism 2 comprises a negative pressure cylinder 21, an upper cover 22, a lower cover 23, a first pressing rod 24 and a second pressing rod 25, the upper cover 22 is used for closing the upper port of the negative pressure cylinder 21, the lower cover 23 is used for closing the lower port of the negative pressure cylinder 21, in the embodiment, the lower cover 23 is in closed connection with the lower end of the negative pressure cylinder 21, the upper cover 22, the first pressing rod 24 and the second pressing rod 25 can all move up and down, the upper cover 22, the first pressing rod 24 and the second pressing rod 25 are respectively driven by linear driving components, and the linear driving components can be linear modules, hydraulic cylinders or air cylinders and the like;

[0044] The first pressing rod 24 is connected with the upper cover 22, the upper cover 22 is provided with a first through hole 221 for the first pressing rod 24 to pass through, the inner wall of the first through hole 221 is provided with a first annular groove 222, the first sealing ring 223 is installed on the upper cover 22 through the first annular groove 222, and the first sealing ring 223 is used for sealing the cooperation gap between the first pressing rod 24 and the first through hole 221; the second pressing rod 25 is connected with the lower cover 23 in a penetrating mode, the lower cover 23 is provided with a second through hole 231 for the second pressing rod 25 to pass through, the inner wall of the second through hole 231 is provided with a second annular groove 232, the second sealing ring 233 is installed on the lower cover 23 through the second annular groove 232, and the second sealing ring 233 is used for sealing the cooperation gap between the second pressing rod 25 and the second through hole 231;

[0045] With reference to Figure 3 and Figure 4 , the first pressing rod 24 and the second pressing rod 25 can jointly extrude the aluminum electrolytic capacitor 1, the lower end surface of the first pressing rod 24 needs to be provided with an annular avoiding groove 246 for avoiding the lead of the aluminum electrolytic capacitor 1, the upper end of the second pressing rod 25 is fixedly connected with the sealing plate 26, the outer circumferential surface of the sealing plate 26 is provided with a third annular groove 261; the third annular groove 261 in the sealing plate 26 is provided with a third sealing ring 262, and the sealing plate 26 is sealingly matched 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 with the vacuum extraction pipeline 27, the negative pressure cylinder 21 is provided with an air extraction hole 211 in communication with the vacuum extraction pipeline 27, the moving stroke of the sealing plate 26 in the negative pressure cylinder 21 passes through the air extraction hole 211, and the vacuum extraction pipeline 27 is used for being connected with a vacuum generating device, which is usually a vacuum pump; the vacuum extraction pipeline 27 is provided with a negative pressure buffer tank 28;

[0046] The process of packaging the aluminum electrolytic capacitor 1 by using the negative pressure containing mechanism 2 includes the following steps:

[0047] Step 21, first move the sealing plate 26 above the air extraction hole 211;

[0048] Step 22, then move the upper cover 22 and the first pressing rod 24 upward to leave the negative pressure cylinder 21, and then place the aluminum electrolytic capacitor 1 into the negative pressure cylinder 21;

[0049] Step 23, then jointly close the upper end of the negative pressure cylinder 21 by the upper cover 22 and the first pressing rod 24;

[0050] Step 24, then move the sealing plate 26 downward below the air extraction hole 211;

[0051] Step 25, then jointly extrude the aluminum electrolytic capacitor 1 by the first pressing rod 24 and the second pressing rod 25;

[0052] Step 26, then, the sealing plate 26 is re-moved to the suction hole 211 above, and the upper cover 22 and the first pressure rod 24 is moved again to take out the finished aluminum electrolytic capacitor 1; when taking out the aluminum electrolytic capacitor 1, the sealing plate 26 can be moved to the position of the upper surface flush or higher than the upper end of the negative pressure cylinder 21.

[0053] The implementation principle of the negative pressure packaging method of the aluminum electrolytic capacitor in the embodiment of the application is as follows: during the process of placing and taking out the aluminum electrolytic capacitor 1 from the negative pressure cylinder 21, the sealing plate 26 can always play a role of separating the suction hole 211 from the space outside 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 upper cover 22 is moved away from the negative pressure cylinder 21, the negative pressure environment in the negative pressure cylinder 21 fluctuates less, and the work amount of the vacuum generating device for pumping the inner cavity of the negative pressure cylinder 21 is greatly reduced, which is conducive to reducing the energy consumed by vacuum pumping. During the process of packaging the aluminum electrolytic capacitor 1, the sealing plate 26 is retracted to the lower side of the suction hole 211, so that the aluminum electrolytic capacitor 1 is placed in the required negative pressure environment, meeting the requirement of packaging in the negative pressure environment.

[0054] Embodiment 2, the difference between this embodiment and embodiment 1 is that:

[0055] 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 the negative pressure containing mechanism 2 is packaging the aluminum electrolytic capacitor 1, the first pressure rod 24 and the second pressure rod 25 are simultaneously lowered first, and then the first pressure rod 24 and the second pressure rod 25 are simultaneously raised.

[0056] When the first pressure rod 24 and the second pressure rod 25 are simultaneously lowered, there is a speed difference between the first pressure rod 24 and the second pressure rod 25, so that the first pressure rod 24 and the second pressure rod 25 produce a squeezing effect on the aluminum electrolytic capacitor 1; when the first pressure rod 24 and the second pressure rod 25 are simultaneously raised, there is a speed difference between the first pressure rod 24 and the second pressure rod 25, so that the first pressure rod 24 and the second pressure rod 25 produce a squeezing effect on the aluminum electrolytic capacitor 1, and the first pressure rod 24 and the second pressure rod 25 produce a segmented squeezing effect on the aluminum electrolytic capacitor 1, which is conducive to reducing the excessive heat generated by excessive friction caused by too fast packaging, and is conducive to protecting the aluminum electrolytic capacitor 1. Furthermore, the packaging is realized during the process of moving the first pressure rod 24 and the second pressure rod 25 in the same direction, which is conducive to prolonging the actual packaging and squeezing time, thereby further reducing the heat generated by friction during packaging.

[0057] Embodiment 3, the difference between this embodiment and embodiment 1 is that:

[0058] In step 25, the descending speed of the first pressing rod 24 is greater than the descending speed of the second pressing rod 25, and the ascending speed of the second pressing rod 25 is greater than the ascending speed of the first pressing rod 24. When the aluminum electrolytic capacitor 1 is packaged, the negative pressure accommodating mechanism 2 first makes the first pressing rod 24 and the second pressing rod 25 simultaneously descend to press, and then makes the first pressing rod 24 and the second pressing rod 25 simultaneously ascend. In the process of the first pressing rod 24 and the second pressing rod 25 simultaneously descending to press, the second pressing rod 25 stops before the first pressing rod 24, and reverses to ascend, so that the first pressing rod 24 and the second pressing rod 25 press the aluminum electrolytic capacitor 1 towards each other.

[0059] In embodiment 4, the structure of the first pressing rod 24 and the driving component of the first pressing rod 24 are different from those in embodiment 1. In this embodiment, the driving component of the first pressing rod 24 is a servo motor 4, which is fixedly installed above the upper cover 22.

[0060] With reference to Figure 5 , the first pressing rod 24 includes, from top to bottom, a prism section 241, a screw rod section 242, and a light shaft section 243. The prism section 241 can be a four-prism or a six-prism, etc. The prism section 241 is sleeved with a sleeve 244, the inner hole of the sleeve 244 is adapted to the prism section 241, and the sleeve 244 is used to connect the output shaft of the servo motor 4. A screw rod nut 245 is threadedly connected to the screw rod, and the screw rod nut 245 is fixedly installed in the region between the servo motor 4 and the upper cover 22. The relative positions of the screw rod nut 245, the servo motor 4, and the upper cover 22 remain fixed. The servo motor 4 applies a rotating torque to the first pressing rod 24, so that the first pressing rod 24 spirally ascends and descends, and the first pressing rod 24 presses downward in a spiral manner.

[0061] In step 25, the second pressing rod 25 moves up and down in a spiral rotating manner, so that the second pressing rod 25 can drive the sealing rubber 12 to press into the negative pressure cylinder 21 in a spiral rotating manner, which is beneficial to make the sealing rubber 12 more easily enter the negative pressure cylinder 21.

[0062] In embodiment 5, with reference 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 that of the lower hole section 213. The upper hole section 212 can be sealingly matched with the sealing plate 26, and the lower hole section 213 can be gap-fitted with the sealing plate 26.

[0063] Further, the lower surface of the upper cover 22 is provided with a spiral positioning coil 29, the spiral positioning coil 29 is elastic, the spiral positioning coil 29 is coaxially arranged with the first pressing rod 24 and the second pressing rod 25, the spiral positioning coil 29 is used for positioning the aluminum electrolytic capacitor 1, the lower end of the spiral positioning coil 29 is provided with a horn-shaped guide structure 291, the large end of the guide structure 291 faces downward, and the guide structure 291 is used for guiding the aluminum electrolytic capacitor 1 into the spiral positioning coil 29. In the embodiment, the guide structure 291 is a plurality of spiral coils wound into a horn shape for the spiral positioning coil 29; in another embodiment, the guide structure 291 can be provided as a horn-shaped metal ring.

[0064] Referring to Figure 6 The upper cover 22 is provided with a semiconductor refrigeration piece 5, and a heat insulation structure 51 is arranged between the semiconductor refrigeration piece 5 and the upper cover 22, the heat insulation structure 51 is a polystyrene board or a phenolic foam board, and one end of the spiral positioning coil 29 is connected with the cold end of the semiconductor refrigeration piece 5 after penetrating through the upper cover 22. The surface of the spiral positioning coil 29 is provided with a nano-hydrophobic layer.

[0065] The cold end of the semiconductor refrigeration piece 5 can cool the spiral positioning coil 29, and the spiral positioning coil 29 can abut against the aluminum electrolytic capacitor 1, so that the spiral positioning coil 29 can cool the aluminum electrolytic capacitor 1, and the spiral positioning coil 29 can also cool the inner cavity of the negative pressure cylinder 21.

[0066] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method of negative pressure packaging of an aluminum electrolytic capacitor, characterized by, It comprises the following steps: The element (11) is arranged in the sealing rubber (12), and then the element (11) is arranged in the aluminum shell (13) to form the aluminum electrolytic capacitor (1) to be packaged. The aluminum electrolytic capacitor (1) is packaged by using the negative pressure containing mechanism (2); the negative pressure containing mechanism (2) comprises a negative pressure cylinder (21), an upper cover (22), a lower cover (23), a first pressing rod (24) and a second pressing rod (25); the upper cover (22) is used for closing the upper port of the negative pressure cylinder (21); the lower cover (23) is used for closing the lower port of the negative pressure cylinder (21); the upper cover (22), the first pressing rod (24) and the second pressing rod (25) can all move up and down; the first pressing rod (24) is connected with the upper cover (22) in penetration; the second pressing rod (25) is connected with the lower cover (23) in penetration; the first pressing rod (24) and the second pressing rod (25) can jointly extrude the packaged aluminum electrolytic capacitor (1); the upper end of the second pressing rod (25) is provided with a sealing plate (26); the sealing plate (26) is sealingly matched with the inner wall of the negative pressure cylinder (21); the cylinder wall of the negative pressure cylinder (21) is connected with a vacuum pumping pipeline (27); the negative pressure cylinder (21) is provided with an air exhaust hole (211) in communication with the vacuum pumping pipeline (27); the moving stroke of the sealing plate (26) in the negative pressure cylinder (21) passes through the air exhaust hole (211); and the vacuum pumping pipeline (27) is used for connecting a vacuum generating device. When the aluminum electrolytic capacitor (1) is packaged by using the negative pressure containing mechanism (2), the sealing plate (26) is first moved above the air exhaust hole (211); then the upper cover (22) and the first pressing rod (24) are moved upward to leave the negative pressure cylinder (21), and then the aluminum electrolytic capacitor (1) is arranged in the negative pressure cylinder (21); then the upper cover (22) and the first pressing rod (24) jointly close the upper port of the negative pressure cylinder (21); then the sealing plate (26) is moved downward below the air exhaust hole (211); then the first pressing rod (24) and the second pressing rod (25) jointly extrude the packaged aluminum electrolytic capacitor (1); then the sealing plate (26) is moved again above the air exhaust hole (211), and the upper cover (22) and the first pressing rod (24) are moved upward to leave the negative pressure cylinder (21), and the packaged aluminum electrolytic capacitor (1) is taken out.

2. The negative pressure packaging method of an aluminum electrolytic capacitor according to claim 1, wherein: The descending speed of the first pressing rod (24) is greater than the descending speed of the second pressing rod (25), and the ascending speed of the second pressing rod (25) is greater than the ascending speed of the first pressing rod (24); when the aluminum electrolytic capacitor (1) is packaged by using the negative pressure containing mechanism (2), the first pressing rod (24) and the second pressing rod (25) are simultaneously pressed downward, and then the first pressing rod (24) and the second pressing rod (25) are simultaneously pressed upward.

3. The negative pressure packaging method of an aluminum electrolytic capacitor according to claim 2, wherein: The difference between the descending speed of the first pressing rod (24) and the descending speed of the second pressing rod (25) is less than the difference between the ascending speed of the first pressing rod (24) and the ascending speed of the second pressing rod (25).

4. The negative pressure packaging method of an aluminum electrolytic capacitor according to claim 1, wherein: The descending speed of the first pressing rod (24) is greater than the descending speed of the second pressing rod (25), and the negative pressure accommodating mechanism (2) first makes the first pressing rod (24) and the second pressing rod (25) descend and press simultaneously when packaging the aluminum electrolytic capacitor (1), and the second pressing rod (25) stops before the first pressing rod (24) during the process that the first pressing rod (24) and the second pressing rod (25) descend and press simultaneously, and reverses and ascends, so that the first pressing rod (24) and the second pressing rod (25) oppositely extrude the aluminum electrolytic capacitor (1).

5. The method of negative pressure packaging of aluminum electrolytic capacitor according to claim 1, wherein: The negative pressure accommodating mechanism (2) makes the second pressing rod (25) move up and down in a spiral rotating manner when packaging the aluminum electrolytic capacitor (1).

6. The negative pressure packaging method of an aluminum electrolytic capacitor according to claim 1, wherein: The inner hole of the negative pressure cylinder (21) comprises 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 a gap can be kept between the lower hole section (213) and the sealing plate (26).

7. The method of negative pressure packaging of aluminum electrolytic capacitor according to claim 1, wherein: The lower surface of the upper cover (22) is provided with a spiral positioning coil (29), the spiral positioning coil (29) has elasticity, the spiral positioning coil (29) is coaxially arranged with the first pressing rod (24) and the second pressing rod (25), the spiral positioning coil (29) is used for positioning the aluminum electrolytic capacitor (1), the lower end of the spiral positioning coil (29) is provided with a horn-shaped guide structure (291), the large end of the guide structure (291) faces downward, and the guide structure (291) is used for guiding the aluminum electrolytic capacitor (1) into the spiral positioning coil (29).

8. The negative pressure packaging method of an aluminum electrolytic capacitor according to claim 7, wherein: The upper cover (22) is provided with a semiconductor refrigeration sheet (5), a heat insulation structure (51) is arranged between the semiconductor refrigeration sheet (5) and the upper cover (22), and one end of the spiral positioning coil (29) is connected with the cold end of the semiconductor refrigeration sheet (5) after penetrating through the upper cover (22).

9. The method of negative pressure packaging of an aluminum electrolytic capacitor according to claim 8, wherein: The surface of the spiral positioning coil (29) is provided with a nano hydrophobic layer.

10. The method of negative pressure packaging of an aluminum electrolytic capacitor according to claim 1, wherein: The vacuum pipeline (27) is provided with a negative pressure buffer tank (28).

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