Filling and sealing tool for two-end lead-out type mica paper capacitor
By designing a potting mold with infusion cavity, upper lead hole, lower lead hole, injection hole and outflow hole, the problems of poor positioning and bubble generation in traditional potting tools are solved, and high-quality capacitor potting is achieved.
Patent Information
- Application Number
- CN202421775952.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-25
AI Technical Summary
Traditional mica paper capacitor potting tooling is difficult to ensure the capacitor core is in the middle position in the mold, and bubbles and cracks are easily generated during the potting process, affecting product quality.
A potting mold including a filling cavity, an upper lead hole, a lower lead hole, an injection hole and an outflow hole is designed. Through the cooperation of these structures, the upper and lower leads of the capacitor core can be positioned simultaneously, and gradually flow upward from the bottom of the filling cavity through epoxy resin to avoid the generation of bubbles.
Reliable positioning of the capacitor core is achieved, potting quality is improved, bubbles and cracks are avoided, and the appearance and quality of the product is ensured.
Smart Images
Figure CN223038795U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a capacitor potting tooling, in particular to a potting tooling for a two-end lead-out mica paper capacitor. Background Art
[0002] A mica paper capacitor is a capacitor with natural mica material with insulating properties as the core medium. Its shape often presents as a regular square. Such a design not only facilitates integration into electronic devices, but also helps to optimize the internal structure layout, improve space utilization rate, and thus achieve a larger capacitance within a limited space. A two-end lead-out mica paper capacitor is a mica paper capacitor with leads led out from both ends and is the most widely used mica paper capacitor.
[0003] Potting is an important link in the production process of mica paper capacitors. It is used to coat an insulating sealant such as epoxy resin outside the capacitor core to form a firm insulating protective layer, isolating the influence of the external environment on the inside of the capacitor in all directions, including preventing moisture intrusion, blocking the penetration of pollutants, resisting mechanical impacts, etc., to ensure that the capacitor can maintain excellent electrical performance and a long service life under various harsh conditions.
[0004] The traditional potting tooling for mica paper capacitors is generally a mold with an inner cavity and an open upper end. A lead hole is provided at the bottom of the inner cavity. During potting, the capacitor core is placed in the inner cavity, the lower lead is placed in the lead hole, and the upper lead is located above the mold. When potting, epoxy resin is injected into the inner cavity of the mold from top to bottom until the upper end of the capacitor core is immersed. Such a traditional potting tooling and potting method have the following defects: First, only relying on the positioning of the lower lead, if the upper end is not positioned, it is difficult to ensure that the capacitor core is in the center position of the inner cavity of the mold, reducing the potting quality. If the upper end of the capacitor core is positioned through other positioning structures, it is very difficult to design a reasonable positioning structure without affecting the injection of epoxy resin, and it is difficult to ensure that the capacitor core is in the center position. Second, when the epoxy resin submerges to the root of the upper lead, the epoxy resin is prone to climb upward along the lead, affecting the appearance and quality of the product. Third, the epoxy resin enters the inner cavity of the mold from above, and it is easy to generate bubbles. Moreover, since the injection of epoxy resin needs to be stopped just when the epoxy resin just submerges the upper end of the capacitor core, the epoxy resin liquid level at the upper end of the capacitor core is in the air during the solidification process, so bubbles and cracks are likely to form on the upper surface position of the capacitor core, reducing the potting quality. Fourth, normal temperature potting is not conducive to discharging bubbles during the injection of epoxy resin, and it will also reduce the potting quality. Summary of the Utility Model
[0005] The object of the utility model is to provide a potting tooling for a two-end lead-out mica paper capacitor, which can be reliably positioned and achieve high-quality potting, so as to solve the above problems.
[0006] The utility model realizes the above object through the following technical solutions:
[0007] A potting tooling for a two-end lead-out mica paper capacitor, comprising a potting mold provided with a perfusion inner cavity, the upper and lower ends of the perfusion inner cavity are both closed, a vertical upper lead hole is provided in the middle of the upper cavity top of the perfusion inner cavity, a vertical lower lead hole is provided in the middle of the lower cavity bottom of the perfusion inner cavity, a vertical injection hole is provided at a position beside the perfusion inner cavity on the potting mold, the upper end of the injection hole extends to the upper surface of the potting mold and opens, the lower end of the injection hole communicates with the bottom of the perfusion inner cavity, a vertical outflow hole is provided at the upper cavity top of the perfusion inner cavity and the upper end of the outflow hole extends to the upper surface of the potting mold and opens.
[0008] Preferably, in order to improve the potting efficiency, one perfusion inner cavity, one upper lead hole, one lower lead hole, one injection hole and one outflow hole form one perfusion unit, and a plurality of the perfusion units are arranged in sequence horizontally on the potting mold.
[0009] Preferably, for the convenience of processing and assembly, the potting mold is formed by connecting two half molds. A plurality of inner cavity grooves are arranged in sequence horizontally in the middle of the first side surface of the two opposite side surfaces of the half mold. Vertical upper lead grooves with a semicircular radial cross-section are respectively provided at positions above the middle of the upper ends of the plurality of inner cavity grooves on the first side surface of the half mold. Vertical lower lead grooves with a semicircular radial cross-section are respectively provided at positions below the middle of the lower ends of the plurality of inner cavity grooves on the first side surface of the half mold. Vertical injection grooves with a semicircular radial cross-section are respectively provided at positions beside the plurality of inner cavity grooves on the first side surface of the half mold. The lower end of the injection groove communicates with the bottom of the inner cavity groove. Vertical outflow grooves with a semicircular radial cross-section are respectively provided at positions above the plurality of inner cavity grooves on the first side surface of the half mold. The plurality of inner cavity grooves of the two half molds are respectively butted to form a plurality of perfusion inner cavities. The plurality of upper lead grooves of the two half molds are respectively butted to form a plurality of upper lead holes. The plurality of lower lead grooves of the two half molds are respectively butted to form a plurality of lower lead holes. The plurality of injection grooves of the two half molds are respectively butted to form a plurality of injection holes. The plurality of outflow grooves of the two half molds are respectively butted to form a plurality of outflow holes.
[0010] Preferably, in order to facilitate the reliable connection of the two half-molds, a plurality of horizontal through holes or screw holes are provided on the half-molds, and a plurality of connecting bolts pass through the through holes or screw holes of the two half-molds to realize the connection between the two half-molds.
[0011] Preferably, in order to facilitate the hand-held movement of the potting mold, threaded grooves are respectively provided at positions near the horizontal two ends in the first side surface of the half-mold, and the radial cross-section of the threaded groove is semi-circular. The threaded grooves at both ends of the two half-molds are respectively butted to form threaded holes at the horizontal two ends of the potting mold, and the threaded posts on the two handle columns are respectively connected to the two threaded holes.
[0012] Preferably, in order to better drain the epoxy resin to achieve a better potting effect, the injection hole and the outflow hole are respectively located on opposite sides of the upper lead hole.
[0013] Preferably, in order to further improve the potting efficiency and integrally heat during the potting process to improve the potting quality, the potting tooling for the two-end lead-out mica paper capacitor further includes a base and a mold box. The mold box is installed on the upper surface of the base. An electric heating unit is provided in the base, and the heat generated by the electric heating unit can be transferred to the mold box. A plurality of installation cavities are provided in the mold box, and a plurality of the potting molds are respectively placed in the plurality of installation cavities. The electric heating unit here can adopt conventional electric heating components in the prior art according to needs, such as electric heating wires, electric heating tubes, electric heating sheets, etc.
[0014] Preferably, in order to achieve a good heat conduction effect and avoid heat dissipation of the base, the potting mold is a metal mold, the mold box is a metal box, the base is a non-metal base, and a metal plate is provided between the upper surface of the electric heating unit and the mold box.
[0015] The beneficial effects of the present utility model are as follows:
[0016] The utility model can position the leads at both the upper and lower ends of the capacitor core simultaneously by arranging a perfusion inner cavity, an upper lead hole, and a lower lead hole that cooperate with each other in the potting mold, thereby ensuring that the capacitor core is in the center position in the perfusion inner cavity, and no additional positioning structure is required, improving the potting quality and facilitating operation. By arranging an injection hole communicating with the bottom of the perfusion inner cavity in the potting mold and an outflow hole above the perfusion inner cavity, when potting, the epoxy resin flows gradually upward from the bottom of the perfusion inner cavity, which can better avoid generating bubbles and improve the potting quality. Moreover, after the epoxy resin submerges to the upper end of the capacitor core, the epoxy resin can continue to be potted until it is about to reach the upper end of the outflow hole and then stop potting. On the one hand, the epoxy resin cannot climb upward along the lead at the upper end of the capacitor core. On the other hand, the epoxy resin liquid level at the upper end of the capacitor core is not in the air during the solidification process, and no bubbles and cracks will be generated, improving the potting quality. In addition, by adding a base and a mold box, on the one hand, more potting molds are concentrated together to improve the potting efficiency. On the other hand, an electric heating unit is arranged in the base to heat the epoxy resin in all the potting molds integrally during the potting process, which can better discharge bubbles and further improve the potting quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a perspective view of a half mold of the potting tooling for a two-terminal lead-out mica paper capacitor according to the utility model;
[0018] Figure 2 is a front view of a half mold of the potting tooling for a two-terminal lead-out mica paper capacitor according to the utility model;
[0019] Figure 3 is Figure 2 the A-A cross-sectional view in
[0020] Figure 4 is a perspective view of the potting tooling for a two-terminal lead-out mica paper capacitor according to the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The following further describes the utility model with reference to the drawings:
[0022] As Figures 1-4 shown, the potting tooling for a two-terminal lead-out mica paper capacitor according to the utility model includes a potting mold 12 provided with a perfusion inner cavity (refer to the following content and Figure 1 and Figure 2 , and two inner cavity grooves 3 are combined into a perfusion inner cavity), the upper and lower ends of the perfusion inner cavity are both closed, and a vertical upper lead hole 14 (refer to the following content and Figure 1 , Figure 2 and Figure 4, two upper lead grooves 6 are combined to form an upper lead hole 14). The upper lead hole 14 in the figure extends to and opens on the upper surface of the potting mold 12, or it may not extend to the upper surface of the potting mold 12. In the middle of the bottom of the lower end of the pouring cavity, there is a vertical lower lead hole (refer to the following content and Figure 1 and Figure 2 , two lower lead grooves 8 are combined to form a lower lead hole). The lower lead hole in the figure extends to and opens on the lower surface of the potting mold 12, or it may not extend to the lower surface of the potting mold 12. At a position on the potting mold 12 beside the pouring cavity, there is a vertical injection hole 15 (refer to the following content and Figure 1 、 Figure 2 and Figure 4 , two injection grooves 5 are combined to form an injection hole 15). The upper end of the injection hole 15 extends to and opens on the upper surface of the potting mold 12, and the lower end of the injection hole 15 communicates with the bottom of the pouring cavity. At the top of the upper end of the pouring cavity, there is a vertical outflow hole 13 (refer to the following content and Figure 1 、 Figure 2 and Figure 4 , two outflow grooves 7 are combined to form an outflow hole 13) and the upper end of this outflow hole 13 extends to and opens on the upper surface of the potting mold 12.
[0023] As Figures 1-4 shown, the present utility model also discloses the following multiple more optimized specific structures:
[0024] To improve the potting efficiency, one pouring cavity, one upper lead hole 14, one lower lead hole, one injection hole 15 and one outflow hole 13 form a pouring unit, and multiple such pouring units are arranged in sequence horizontally on the potting mold.
[0025] For the convenience of processing and assembly, the potting mold 12 is formed by connecting two half-molds 2. In the middle of the first side of the two opposite sides of the half-mold 2, a plurality of inner cavity grooves 3 are arranged in sequence horizontally. Above the middle of the upper ends of the plurality of inner cavity grooves 3 on the first side of the half-mold 2, vertical upper lead grooves 6 are respectively provided, and the radial cross-section of the upper lead groove 6 is semicircular. Below the middle of the lower ends of the plurality of inner cavity grooves 3 on the first side of the half-mold 2, vertical lower lead grooves 8 are respectively provided, and the radial cross-section of the lower lead groove 8 is semicircular. On the first side of the half-mold 2, at positions beside the plurality of inner cavity grooves 3, vertical injection grooves 5 are respectively provided, and the radial cross-section of the injection groove 5 is semicircular. The lower end of the injection groove 5 communicates with the bottom of the inner cavity groove 3. Above the plurality of inner cavity grooves 3 on the first side of the half-mold 2, vertical outflow grooves 7 are respectively provided, and the radial cross-section of the outflow groove 7 is semicircular. The plurality of inner cavity grooves 3 of the two half-molds 2 are respectively butted to form a plurality of the perfusion inner cavities. The plurality of upper lead grooves 6 of the two half-molds 2 are respectively butted to form a plurality of upper lead holes 14. The plurality of lower lead grooves 8 of the two half-molds 2 are respectively butted to form a plurality of the lower lead holes. The plurality of injection grooves 5 of the two half-molds 2 are respectively butted to form a plurality of injection holes 15. The plurality of outflow grooves 7 of the two half-molds 2 are respectively butted to form a plurality of outflow holes 13.
[0026] For the convenience of reliably connecting the two half-molds 2, a plurality of horizontal through holes or screw holes 4 are provided on the half-mold 2 (preferably, a plurality of horizontal through holes are provided on one half-mold 2 and a plurality of horizontal screw holes are provided on the other half-mold 2). A plurality of connecting bolts 16 pass through the through holes or screw holes 4 of the two half-molds 2 to realize the connection between the two half-molds 2.
[0027] For the convenience of holding and moving the potting mold 12, at positions near the horizontal two ends on the first side of the half-mold 2, thread grooves 1 are respectively provided, and the radial cross-section of the thread groove 1 is semicircular. The thread grooves 1 at both ends of the two half-molds 2 are respectively butted to form thread holes at the horizontal two ends of the potting mold 12. The thread posts on the two handle columns 11 are respectively connected to the two thread holes.
[0028] To better drain the epoxy resin to achieve a better potting effect, the injection holes 15 and the outflow holes 13 are respectively located on the opposite sides of the upper lead holes 14.
[0029] In order to further improve the potting efficiency and perform overall heating during the potting process to improve the potting quality, the potting tooling for the two-end lead-out mica paper capacitor further includes a base 9 and a mold box 10. The mold box 9 is installed on top of the base 10. An electric heating unit (not visible in the figure) is provided inside the base 10, and the heat generated by the electric heating unit can be transferred to the mold box 9. A plurality of installation cavities (not visible in the figure) are provided inside the mold box 9, and a plurality of potting molds 12 are respectively placed in the plurality of installation cavities. The electric heating unit here can adopt conventional electric heating components in the prior art according to needs, such as electric heating wires, electric heating tubes, electric heating sheets, etc.
[0030] In order to achieve good heat conduction effect and avoid heat dissipation of the base 10, the potting mold 12 is a metal mold, the mold box 9 is a metal box, and the base 10 is a non-metal base. A metal plate (not visible in the figure) is provided between the upper surface of the electric heating unit and the mold box 9.
[0031] As Figures 1-4 shown, during application, before assembling the two half-molds 2, the first half-mold 2 can be placed flat first with the inner cavity groove 3 facing up. A plurality of capacitor cores (not shown in the figure) are respectively placed in the plurality of inner cavity grooves 3 of the first half-mold 2, and the leads at both ends of the capacitor cores are respectively placed in the corresponding upper lead grooves 6 and lower lead grooves 8 to achieve the positioning of the plurality of capacitor cores. Then, the second half-mold 2 is placed downward on top of the first half-mold 2 and aligned, and then the two half-molds 2 are connected together by connecting bolts 16 to form a potting mold 12 after installing the capacitor cores. Install a plurality of potting molds 12 with capacitor cores installed and connected in this way, and then place them together in the plurality of installation cavities of the mold box 9. Control the electric heating unit to start heating. One or more people respectively pour liquid epoxy resin into the plurality of injection holes 15. The epoxy resin enters from the bottom of the injection inner cavity and gradually submerges the corresponding capacitor cores from bottom to top. During this process, air is discharged through the corresponding outflow holes 13. At the same time, under the heating effect, no or very few bubbles are generated in the epoxy resin; when the epoxy resin rises to the position where the upper end of the capacitor core is located, it is blocked by the top of the corresponding injection inner cavity. Continue to pour epoxy resin, and the epoxy resin continues to flow upward from the outflow holes 13 until the epoxy resin reaches the upper end (visible to the naked eye) near the outflow holes 13, then stop pouring epoxy resin, then stop heating and wait for the epoxy resin to solidify. After solidification, the potting mold 12 can be removed, the connecting bolts 16 are removed, the half-molds 2 are separated, and the capacitor cores encapsulated with epoxy resin are taken out. After other processes such as cutting the excess epoxy resin and polishing, the two-end lead-out mica paper capacitor is obtained.
[0032] The above embodiments are only the preferred embodiments of the present utility model and do not limit the technical solutions of the present utility model. Any technical solution that can be achieved on the basis of the above embodiments without creative work shall be regarded as falling within the scope of the patent rights of the present utility model.
Claims
1. A potting tool for a two-terminal lead-out mica paper capacitor, comprising a potting mold provided with a potting inner cavity, characterized in that: The upper and lower ends of the perfusion cavity are both closed, a vertical upper lead hole is provided in the middle of the cavity top of the upper end of the perfusion cavity, a vertical lower lead hole is provided in the middle of the cavity bottom of the lower end of the perfusion cavity, a vertical injection hole is provided on the potting mold at a position next to the potting cavity, the upper end of the injection hole extends to the upper surface of the potting mold and opens, the lower end of the injection hole is connected to the bottom of the potting cavity, a vertical outflow hole is provided on the cavity top of the upper end of the perfusion cavity, and the upper end of the outflow hole extends to the upper surface of the potting mold and opens.
2. The potting tool for two-terminal lead-out mica paper capacitor according to claim 1, characterized in that: One of the perfusion inner cavities, one of the upper lead holes, one of the lower lead holes, one of the injection holes and one of the outflow holes constitutes a perfusion unit, and the encapsulation mold is provided with a plurality of the perfusion units arranged in sequence in a transverse direction.
3. The potting tool for the two-terminal lead-out mica paper capacitor according to claim 2, characterized in that: The encapsulation mold is formed by connecting two half molds, and a plurality of inner cavity grooves arranged in sequence in a transverse direction are arranged in the middle of the first side of the two opposite side surfaces of the half mold, and vertical upper lead grooves are respectively arranged at positions above the middle of the upper ends of the plurality of inner cavity grooves in the first side of the half mold, and the radial cross-section of the upper lead grooves is semicircular, and vertical lower lead grooves are respectively arranged at positions below the middle of the lower ends of the plurality of inner cavity grooves in the first side of the half mold, and the radial cross-section of the lower lead grooves is semicircular, and vertical injection grooves are respectively arranged at positions beside the plurality of inner cavity grooves in the first side of the half mold, and the radial cross-section of the injection grooves is semicircular, and the injection The lower end of the inlet groove is connected to the bottom of the inner cavity groove, and vertical outflow grooves are respectively provided at positions above the multiple inner cavity grooves in the first side of the half mold, and the radial cross-section of the outflow groove is semicircular, the multiple inner cavity grooves of the two half molds are respectively connected to form a plurality of the infusion cavities, the multiple upper lead grooves of the two half molds are respectively connected to form a plurality of upper lead holes, the multiple lower lead grooves of the two half molds are respectively connected to form a plurality of lower lead holes, the multiple injection grooves of the two half molds are respectively connected to form a plurality of injection holes, and the multiple outflow grooves of the two half molds are respectively connected to form a plurality of outflow holes.
4. The potting tool for the two-terminal lead-out mica paper capacitor according to claim 3, characterized in that: The half molds are provided with a plurality of transverse through holes or screw holes, and a plurality of connecting bolts pass through the through holes or screw holes of the two half molds to realize the connection between the two half molds.
5. The potting tool for two-terminal lead-out mica paper capacitor according to claim 3, characterized in that: Threaded grooves are provided in the first side surface of the half mold near the two lateral ends, and the radial cross-section of the threaded grooves is semicircular. The threaded grooves at the two ends of the two half molds are respectively connected to form threaded holes at the two lateral ends of the potting mold, and the threaded columns on the two handle columns are respectively connected to the two threaded holes.
6. The potting tool for two-terminal-lead mica paper capacitors according to any one of claims 1 to 5, characterized in that: The injection hole and the outflow hole are respectively located at two opposite sides of the upper lead hole.
7. The potting tool for two-terminal-lead mica paper capacitors according to any one of claims 1 to 5, characterized in that: The potting tooling for the two-terminal lead-out mica paper capacitor also includes a base and a mold box. The mold box is installed on the base. An electric heating unit is provided in the base and the heat generated by the electric heating unit can be transferred to the mold box. A plurality of installation cavities are provided in the mold box, and a plurality of the potting molds are respectively placed in the plurality of the installation cavities.
8. The potting tool for two-terminal lead-out mica paper capacitor according to claim 7, characterized in that: The potting mold is a metal mold, the mold box is a metal box, the base is a non-metal seat, and a metal plate is arranged between the upper surface of the electric heating unit and the mold box.