Capacitor leakage-proof structure

Abstract

The utility model discloses a leakage-proof structure of a capacitor, which comprises a shell and an insulating table, and the shell is provided with a positioning groove; a connecting part in contact with the shell is arranged on the insulating table, and a convex block matched with the positioning groove is arranged on the connecting part; the surface of the connecting part is covered with a coating film; the shell and the insulating table are inserted into the positioning groove through the convex block to form a cavity for accommodating the capacitor core; an overflow channel communicated with the cavity is arranged between the protruding block and the positioning groove, and a groove is formed in the side, away from the cavity, of the overflow channel. According to the leakage-proof structure of the capacitor, the shell and the insulating table are arranged, and the convex block is inserted into the positioning groove to form the cavity and the overflow channel, so that the capacitor core is quickly sealed, the condition of resin overflow in the resin filling and sealing process is avoided, and the stability of the leakage-proof structure of the capacitor is improved; by arranging the coating film and the groove, liquid resin forms a lotus leaf effect on the coating film, flowing of the resin in the overflow channel can be effectively blocked, the groove can store the resin passing through the overflow channel, and the situation that the resin overflows is prevented.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a capacitor leakage prevention structure. Background Technology

[0002] Resin potting for film capacitors involves injecting epoxy resin potting compound into a casing containing welded components using equipment or manually. Under heat, this compound cures into a high-performance thermosetting polymer insulating material, achieving bonding, sealing, and thermal conductivity. Its main function is to improve the film capacitor's resistance to external impacts and vibrations, enhance its waterproof, dustproof, and moisture-proof properties, and improve its thermal conductivity. However, during the resin encapsulation process, after the welded components and insulating base are assembled into the casing, gaps exist between the insulating base and the casing. Resin can easily leak from these gaps during potting and curing, affecting the installation of other components and the product's appearance. Currently, during resin potting, a sealing strip is installed between the casing and the insulating base to prevent resin leakage during potting and curing, thus reducing production efficiency. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a capacitor leakage prevention structure that ensures the sealing between the outer casing and the welding components, improves the stability of the capacitor leakage prevention structure, and increases the production yield of capacitors.

[0004] The technical solution adopted by this utility model to solve its problem is:

[0005] A capacitor leakage prevention structure includes: a housing and an insulating platform, wherein the housing is provided with a positioning groove; the insulating platform is provided with a connecting portion that contacts the housing, and the connecting portion is provided with a protrusion that mates with the positioning groove; the surface of the connecting portion is covered with a coating; the housing and the insulating platform are inserted into the positioning groove through the protrusion to form a cavity for accommodating the capacitor core; an overflow channel communicating with the cavity is provided between the protrusion and the positioning groove, and a groove is provided on the side of the overflow channel away from the cavity.

[0006] The above-mentioned capacitor leakage prevention structure has at least the following beneficial effects: by setting the outer shell and insulating platform, the protrusion is inserted into the positioning groove to form a cavity and overflow channel, which quickly seals the capacitor core and prevents resin overflow during the resin potting process, thereby improving the stability of the capacitor leakage prevention structure; by setting the coating and groove, the liquid resin forms a lotus leaf effect on the coating, which can effectively block the flow of resin in the overflow channel, and the groove can store the resin passing through the overflow channel, preventing resin overflow and improving the production yield of the capacitor.

[0007] Furthermore, the connecting portion is also provided with a first support platform and a second support platform. The first support platform is located between the cavity and the protrusion, and the second support platform is located outside the protrusion. By providing the first and second support platforms, a sealed space can be effectively formed between the outer shell and the insulating platform, ensuring the sealing performance of the capacitor's leak-proof structure.

[0008] Furthermore, the height of the first support platform is less than the height of the second support platform. This structure ensures a tight seal between the protrusion and the positioning groove, preventing resin leakage and improving the stability of the capacitor's leak-proof structure.

[0009] Furthermore, the first support platform, the protrusion, and the positioning groove together form the overflow channel. This overflow channel, formed by the first support platform, the protrusion, and the positioning groove, ensures that the overflow channel can stably connect the cavity and the groove, thereby preventing resin from overflowing.

[0010] Furthermore, the coating covers the surfaces of the protrusion, the first support platform, and the second support platform. This structure ensures that the coating covers the connection between the outer casing and the insulating platform, guaranteeing the sealing performance of the capacitor's leak-proof structure.

[0011] Furthermore, the coating is made of polyacrylate materials. Polyacrylate materials have the advantages of high temperature resistance and corrosion resistance, and also have superhydrophobic properties, which allow the liquid resin to form a lotus leaf effect on the coating, effectively blocking the flow of resin in the overflow channel and preventing resin from overflowing between the shell and the insulating base, thereby improving the production yield of the capacitor.

[0012] Furthermore, a limiting block is provided at the upper end of the outer casing, and a limiting groove is provided between the limiting block and the positioning groove; a locking block is provided at the upper end of the insulating platform to cooperate with the limiting groove. By setting the limiting block and the locking block, the outer casing and the insulating platform can be stably connected by inserting the locking block into the limiting groove, thereby improving the stability of the capacitor leakage prevention structure.

[0013] Furthermore, the height of the limiting block gradually decreases from bottom to top. This structure facilitates the precise and stable fixing of the insulating platform onto the outer casing, improving the production efficiency of the capacitor.

[0014] Furthermore, the groove is located on the side of the protrusion away from the cavity. This structure ensures that the liquid resin reaches the groove after flowing through the overflow channel and is stored in the groove under the action of gravity, preventing resin overflow.

[0015] Furthermore, the width of the groove gradually decreases along the direction approaching the cavity. This structure ensures that the groove can accommodate a certain amount of liquid resin flowing through the overflow channel and effectively prevents the resin from overflowing between the outer shell and the insulating platform.

[0016] The beneficial effects of the above-mentioned capacitor leakage prevention structure are as follows: By setting up a shell and an insulating platform, the protrusion is inserted into the positioning groove to form a cavity and an overflow channel, which quickly seals the capacitor core and prevents resin overflow during resin potting, thus improving the stability of the capacitor leakage prevention structure; by setting up a coating and grooves, the liquid resin forms a lotus leaf effect on the coating, which can effectively block the flow of resin in the overflow channel, and the grooves can store the resin passing through the overflow channel, preventing resin overflow and improving the production yield of the capacitor; by setting up a first support platform and a second support platform, a sealed space can be effectively formed between the shell and the insulating platform, ensuring the sealing performance of the capacitor leakage prevention structure; by setting up grooves, the connection stability between the capacitor core and the shell can be effectively ensured, preventing the capacitor core from loosening after resin potting, thus improving the structural stability of the capacitor leakage prevention structure; by setting up limiting blocks and locking blocks, the shell and the insulating platform can be stably connected by the locking blocks being inserted into the limiting grooves, thus improving the stability of the capacitor leakage prevention structure.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a capacitor leakage prevention structure according to an embodiment of the present invention;

[0019] Figure 2 This is an exploded view of a capacitor leakage prevention structure according to an embodiment of the present invention;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of the middle insulating platform from another angle;

[0021] Figure 4 This is a cross-sectional view of a capacitor leakage prevention structure according to an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of the structure of part A in the middle. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] Reference Figures 1 to 5This utility model provides a capacitor leakage prevention structure, including: a housing 100 and an insulating platform 200. The housing 100 is provided with a positioning groove 110; the insulating platform 200 is provided with a connecting part 210 that contacts the housing 100, and the connecting part 210 is provided with a protrusion 220 that cooperates with the positioning groove 110; the surface of the connecting part 210 is covered with a coating 211; the housing 100 and the insulating platform 200 are inserted into the positioning groove 110 through the protrusion 220 to form a cavity 150 for accommodating the capacitor core; an overflow channel 151 communicating with the cavity 150 is provided between the protrusion 220 and the positioning groove 110, and a groove 152 is provided on the side of the overflow channel 151 away from the cavity 150.

[0025] By setting the outer shell 100 and the insulating platform 200, the protrusion 220 is inserted into the positioning groove 110 to form a cavity 150 and an overflow channel 151, which quickly seals the capacitor core and prevents resin overflow during the resin potting process, thereby improving the stability of the capacitor's leak-proof structure. By setting the coating 211 and the groove 152, the liquid resin forms a lotus leaf effect on the coating 211, which can effectively block the flow of resin in the overflow channel 151. The groove 152 can store the resin that has passed through the overflow channel 151, preventing resin overflow and improving the production yield of the capacitor.

[0026] In another embodiment, the connecting portion 210 is further provided with a first support platform 230 and a second support platform 240. The first support platform 230 is located between the cavity 150 and the protrusion 220, and the second support platform 240 is located outside the protrusion 220. By providing the first support platform 230 and the second support platform 240, a sealed space can be effectively formed between the outer shell 100 and the insulating platform 200, ensuring the sealing performance of the capacitor's leak-proof structure.

[0027] In another embodiment, the height of the first support platform 230 is less than the height of the second support platform 240. This structure ensures the seal between the protrusion 220 and the positioning groove 110, prevents resin leakage, and improves the stability of the capacitor leakage prevention structure.

[0028] In another embodiment, the first support platform 230, the protrusion 220, and the positioning groove 110 are closed to form an overflow channel 151. This overflow channel 151, formed by the first support platform 230, the protrusion 220, and the positioning groove 110, ensures that the overflow channel 151 can stably connect the cavity 150 and the groove 152 to prevent resin from overflowing.

[0029] In another embodiment, the coating 211 covers the surfaces of the bump 220, the first support platform 230, and the second support platform 240. This structure ensures that the coating 211 covers the connection 210 between the housing 100 and the insulating platform 200, thus ensuring the sealing performance of the capacitor's leak-proof structure.

[0030] In another embodiment, the coating 211 is made of a polyacrylate material. Polyacrylate materials have the advantages of high temperature resistance and corrosion resistance, and also have superhydrophobic properties, which allows the liquid resin to form a lotus leaf effect on the coating 211, effectively blocking the flow of resin in the overflow channel 151, effectively preventing resin from overflowing between the outer shell 100 and the insulating platform 200, and improving the production yield of the capacitor.

[0031] In another embodiment, the upper end of the outer casing 100 is provided with a limiting block 160, and a limiting groove 161 is provided between the limiting block 160 and the positioning groove 110; the upper end of the insulating platform 200 is provided with a locking block 250 that cooperates with the limiting groove 161. By setting the limiting block 160 and the locking block 250, the outer casing 100 and the insulating platform 200 can be stably connected by inserting the locking block 250 into the limiting groove 161, thereby improving the stability of the capacitor leakage prevention structure.

[0032] In another embodiment, the height of the limiting block 160 gradually decreases from bottom to top. This structure facilitates the precise and stable fixing of the insulating platform 200 onto the housing 100, improving the production efficiency of the capacitor.

[0033] In another embodiment, the groove 152 is located on the side of the protrusion 220 away from the cavity 150. This structure ensures that the liquid resin reaches the groove 152 after flowing through the overflow channel 151 and is stored in the groove 152 under the action of gravity, thus preventing resin overflow.

[0034] In another embodiment, the width of the groove 152 gradually decreases along the direction approaching the cavity 150. This structure ensures that the groove 152 can accommodate a certain amount of liquid resin flowing through the overflow channel 151 and effectively prevents the resin from overflowing between the housing 100 and the insulating platform 200.

[0035] The working principle of this utility model will be further explained below.

[0036] In the prior art, during the resin potting process of the capacitor, in order to prevent liquid resin from overflowing from the gap between the housing 100 and the insulating platform 200, a sealing strip needs to be installed between the housing 100 and the insulating platform 200 to ensure that resin overflow does not occur during the resin curing process and affect the appearance of the capacitor. Therefore, existing capacitor production methods have the following disadvantages: First, high fixture costs: multiple sets of sealing strip pressing fixtures need to be customized during production, increasing equipment costs; second, large design investment: different sealing strip pressing fixtures need to be designed for different shapes of film capacitors during the design phase, consuming design resources; third, long production cycles: the fixture production cycle is long, and fixture identification, installation, and debugging take time, affecting the overall development schedule; fourth, slowing down the production cycle: due to the large size of the fixture, it occupies curing resources, and manual placement of the product into the fixture is required before pressing in the sealing strip, affecting the production cycle; fifth, low versatility: fixtures are difficult to reuse in different projects, resulting in low reuse efficiency; sixth, occupying a large amount of storage space: after the production cycle, the storage of fixtures occupies factory space, wasting resources; and finally, the original production method increases material costs: the need to purchase additional sealing strips increases the cost of raw materials.

[0037] In the production process of the capacitor leakage prevention structure in this embodiment, firstly, according to the specifications of the capacitor core, a shell 100 and an insulating platform 200 of corresponding sizes are selected. Positioning grooves 110 and protrusions 220 are respectively provided on the shell 100 and the insulating platform 200, so that the shell 100 and the insulating platform 200 are inserted into the positioning grooves 110 through the protrusions 220 to form a cavity 150 for accommodating the capacitor core. Next, a coating 211 is applied to the connection portion 210 where the insulating platform 200 contacts the shell 100. Specifically, the portion of the insulating platform 200 other than the connection portion 210 is covered. After the insulating platform 200 is dried, the connection portion 210 is coated. Due to the technical limitations of coating, it is not possible to prevent resin leakage solely through coating; the positioning grooves 110 and protrusions 220 between the shell 100 and the insulating platform 200 are needed to achieve the leakage prevention effect. In some embodiments, by enhancing the precision of the housing 100 and the insulating platform 200, the width of the overflow channel 151 can be effectively reduced to prevent resin from entering the overflow channel 151, thus achieving a sealing and leak-proof effect. However, in practical applications, due to the deviation between the positioning groove 110 and the protrusion 220, a small amount of resin may enter the overflow channel 151 during the resin potting process. Therefore, a groove 152 needs to be provided on the side of the protrusion 220 away from the cavity 150 to further prevent resin overflow.

[0038] In the use of the capacitor leakage prevention structure in this embodiment, the capacitor core is placed in the cavity 150 formed by the housing 100 and the insulating platform 200, and then resin is potted into the cavity. When the liquid resin encapsulates the capacitor core, the positioning groove 110 and the protrusion 220 cover the connection 210 between the insulating platform 200 and the housing 100, and the height of the first support platform 230 is less than that of the second support platform 240, which improves the sealing between the housing 100 and the insulating platform 200. At the same time, when the liquid resin enters the overflow channel 151, the coating 211 forms a lotus leaf effect to block the resin from passing through the overflow channel 151 or the resin molecules from penetrating. This is because the hydrophobic angle is greater than 90°, allowing the coating 211 to prevent resin from passing through through its own hydrophobic effect. In this way, no additional sealing strip is needed during the capacitor production process, saving on the manufacturing and maintenance costs of the sealing strip. Furthermore, the elimination of the identification and installation process for pressing the sealing strip into the fixture shortens the capacitor production cycle. Additionally, manual placement of the sealing strip into the fixture is unnecessary before resin potting, reducing steps and accelerating production. The structure of the outer casing 100 and the insulating platform 200 can be used on most aluminum casing products, improving the versatility of the capacitor's leak-proof structure. Finally, the simple and efficient coating process reduces the capacitor's processing costs.

[0039] As can be seen from the above description, the capacitor leakage prevention structure of this utility model, by setting up a shell 100 and an insulating platform 200, and inserting a protrusion 220 into a positioning groove 110, forms a cavity 150 and an overflow channel 151, which quickly seals the capacitor core and prevents resin overflow during resin potting, thereby improving the stability of the capacitor leakage prevention structure. By setting up a coating 211 and a groove 152, the liquid resin forms a lotus leaf effect on the coating 211, which can effectively block the flow of resin in the overflow channel 151. The groove 152 can store the resin passing through the overflow channel 151, preventing resin overflow and improving the production yield of the capacitor. By setting up a first support platform 230 and a second support platform 240, a sealed space can be effectively formed between the shell 100 and the insulating platform 200, ensuring the sealing performance of the capacitor leakage prevention structure. By setting up a limiting block 160 and a locking block 250, the shell 100 and the insulating platform 200 can be stably connected by inserting the locking block 250 into the limiting groove 161, thereby improving the stability of the capacitor leakage prevention structure.

[0040] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A capacitor leakage prevention structure, characterized in that, include: The device comprises an outer casing and an insulating platform. The outer casing has a positioning groove. The insulating platform has a connecting part that contacts the outer casing. The connecting part has a protrusion that mates with the positioning groove. The surface of the connecting part is covered with a coating. The outer casing and the insulating platform are inserted into the positioning groove through the protrusion to form a cavity for accommodating the capacitor core. An overflow channel communicating with the cavity is provided between the protrusion and the positioning groove. The side of the overflow channel away from the cavity has a groove.

2. The capacitor leakage prevention structure according to claim 1, characterized in that, The connecting part is further provided with a first support platform and a second support platform. The first support platform is located between the cavity and the protrusion, and the second support platform is located outside the protrusion.

3. The capacitor leakage prevention structure according to claim 2, characterized in that, The height of the first support platform is less than the height of the second support platform.

4. The capacitor leakage prevention structure according to claim 3, characterized in that, The first support platform, the protrusion, and the positioning groove cover together form the overflow channel.

5. The capacitor leakage prevention structure according to claim 2, characterized in that, The coating covers the surfaces of the bump, the first support platform, and the second support platform.

6. The capacitor leakage prevention structure according to claim 5, characterized in that, The coating is made of polyacrylate materials.

7. The capacitor leakage prevention structure according to claim 1, characterized in that, The upper end of the outer shell is provided with a limiting block, and a limiting groove is provided between the limiting block and the positioning groove; the upper end of the insulating platform is provided with a locking block that cooperates with the limiting groove.

8. The capacitor leakage prevention structure according to claim 7, characterized in that, The height of the limiting block gradually decreases from bottom to top.

9. A capacitor leakage prevention structure according to claim 1, characterized in that, The groove is located on the side of the protrusion away from the cavity.

10. A capacitor leakage prevention structure according to claim 9, characterized in that, The width of the groove gradually decreases along the direction close to the cavity.

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