Capacitor plastic shell capable of improving potting sealing consistency

Abstract

The utility model discloses a capacitor plastic housing capable of improving potting sealing consistency, comprising a bottom surface and four vertical side surfaces connected with the bottom surface, the inner bottom surface of the plastic housing is provided with a plurality of first ribs, the inner sides of two long side surfaces are provided with a plurality of vertical second ribs, and the inner sides of two short side surfaces are provided with a plurality of vertical third ribs. And the first rib, the second rib and the third rib are not connected with one another. The first rib, the second rib and the third rib are matched to clamp the capacitor core, sufficient space for filling epoxy resin is guaranteed between the capacitor core and the plastic shell, the first rib, the second rib and the third rib are separated, full flowing direction filling of potting materials in the potting process is guaranteed, and bubbles generated due to the fact that epoxy cannot cover dead corners in the process are reduced.

Description

Technical Field

[0001] The utility model relates to the field of film capacitors, in particular to a capacitor plastic shell with improved potting and sealing consistency. Background Art

[0002] Film capacitors are indispensable components in power conversion modules and are often used in DC filtering, AC filtering, absorption, resonance and other lines. With the development of new energy and electricity, the high humidity and hot harsh environment of outdoor applications has put forward more stringent requirements on the moisture resistance of capacitors. When there are bubbles in the potting material inside the product and the capacitor core is not wrapped evenly, moisture is more likely to enter the product, which will cause the capacity to fail faster.

[0003] When moisture enters the body, it will accelerate the electrochemical corrosion of the plated electrode under the action of the electric field, resulting in capacity decay, affecting the service life and reliability of the product. Therefore, it is necessary to optimize the design based on the existing capacitor structure to reduce the bubbles generated after the product is potted with potting materials, and at the same time improve the consistency of the potting material wrapping the capacitor core, thereby improving the sealing and moisture resistance of the product. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the above-mentioned technology to a certain extent. To this end, one purpose of the utility model is to propose a capacitor plastic case with a potting consistency structure to reduce bubbles generated during potting, improve potting consistency, and further improve the moisture resistance and reliability of the product. To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A capacitor plastic case for improving the consistency of potting and sealing, comprising a bottom surface and four vertical side surfaces connected to the bottom surface, wherein two opposite vertical side surfaces located on both sides of the length direction of the plastic case are defined as long side surfaces, and two opposite vertical side surfaces located on both sides of the width direction of the plastic case are defined as short side surfaces, a plurality of first ribs are provided on the inner bottom surface of the plastic case, a plurality of vertical second ribs are provided on the inner sides of the two long side surfaces, and a plurality of vertical third ribs are provided on the inner sides of the two short side surfaces, and the first ribs, the second ribs, and the third ribs are not connected to each other.

[0006] Furthermore, two second ribs are arranged at intervals on the inner side of each long side surface of the plastic shell along the length direction of the plastic shell, and the lower end of the first rib extends to contact the bottom surface of the plastic shell.

[0007] Furthermore, a guiding slope is provided on the top of the second rib for guiding the capacitor core to be inserted into the plastic shell.

[0008] Furthermore, at least two rows of first ribs are arranged on the inner bottom surface of the plastic shell at intervals along the length direction of the plastic shell, each row of first ribs includes at least two first ribs, and two adjacent first ribs in the same row are separated by grooves, and the extension direction of the first ribs is from one long side surface of the plastic shell toward the other long side surface.

[0009] Furthermore, the notch width is ≥1.0 mm.

[0010] Furthermore, the bottom surface of the plastic shell is an arc-shaped bottom surface, and the first rib is an arc-shaped rib matching the arc-shaped bottom surface.

[0011] Furthermore, the bottom surface of the plastic shell is a plane, and the first ribs are straight ribs perpendicular to the long side surfaces of the plastic shell.

[0012] Furthermore, two third ribs are provided in the middle of each short side surface of the plastic shell, and the gap between the two third ribs serves as a wire groove, and the top of the wire groove expands outwards from bottom to top toward both sides into a funnel shape.

[0013] Furthermore, the thickness of the first rib, the second rib and the third rib is ≥0.2 mm.

[0014] Furthermore, there is a gap of ≥1.0 mm between any ribs.

[0015] The utility model has the following beneficial effects:

[0016] The first rib, the second rib and the third rib are arranged inside the plastic shell to cooperate with each other to clamp the capacitor core, so that the capacitor core does not contact the inner wall of the plastic shell, ensuring that there is sufficient space between the capacitor core and the plastic shell for filling epoxy resin. The first rib, the second rib and the third rib are not connected to each other, and the three are separated to ensure that the potting material can flow and fill fully during the potting process, reducing bubbles generated by the epoxy resin in the dead corners during the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a flat-bottom plastic shell of an embodiment of the utility model;

[0018] Figure 2 It is a top view of the flat-bottom plastic case of the embodiment of the utility model, wherein two first ribs are provided in each row of first ribs on the bottom surface of the plastic case;

[0019] Figure 3 is a top view of a flat-bottom plastic shell of an embodiment of the utility model, wherein each row of first ribs on the bottom surface of the plastic shell has only one first rib;

[0020] Figure 4 is a cross-sectional view of the arc-shaped bottom plastic shell of an embodiment of the utility model;

[0021] Figure 5 It is a top view of the arc-shaped bottom plastic shell of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] like Figures 1 to 5 As shown, this embodiment discloses a capacitor mold case 1 for improving potting and sealing consistency, including a bottom surface and four vertical side surfaces connected to the bottom surface. The bottom surface of the mold case 1 can be a flat bottom (such as Figure 1 ), or it can be a curved bottom (such as Figure 2 ). Among them, the arc-shaped bottom of the plastic case 1 is more in line with the shape of the capacitor core, which can reduce the internal space of the plastic case 1, thereby reducing the amount of epoxy resin used, avoiding epoxy resin waste, and achieving the effect of reducing costs.

[0025] In order to allow the epoxy resin to smoothly fill the gap between the capacitor core and the plastic shell 1, and to avoid the generation of bubbles and the problem of uneven wrapping of the capacitor core, ribs are arranged inside the plastic shell 1. In order to facilitate the description of the specific position and shape of the ribs, the two opposite vertical side surfaces located on both sides of the length direction of the plastic shell 1 are defined as long side surfaces 10, and the two opposite vertical side surfaces located on both sides of the width direction of the plastic shell 1 are defined as short side surfaces 9. The inner bottom surface of the plastic shell 1 is provided with a first rib 5, the inner sides of the two long side surfaces 10 are provided with a plurality of vertical second ribs 4, and the inner sides of the two short side surfaces 9 are provided with a plurality of vertical third ribs 2.

[0026] After the capacitor core is installed in the plastic case 1, the first rib 5, the second rib 4 and the third rib 2 are all in contact with the capacitor core. The first rib 5, the second rib 4 and the third rib 2 cooperate to clamp the capacitor core and position the capacitor core so that the capacitor core does not contact the inner wall of the plastic case 1, ensuring that there is sufficient space between the capacitor core and the plastic case 1 for filling epoxy resin. The first rib 5, the second rib 4 and the third rib 2 respectively ensure the minimum filling thickness of the epoxy resin between the capacitor core and the bottom surface, the long side surface 10 and the short side surface 9 of the plastic case 1, thereby ensuring that the wrapping degree of the capacitor core reaches the predetermined effect and ensuring the sealing and moisture resistance of the capacitor core. The positions of the first rib 5, the second rib 4, and the third rib 2 relative to each other should avoid hindering the epoxy resin from filling the interior of the plastic shell 1. Therefore, the first rib 5, the second rib 4, and the third rib 2 are not connected to each other, and the three are separated. The three are far apart, or separated by a groove 6 with a width of ≥1.0mm. The groove 6 is for the epoxy resin to pass through, ensuring that the potting material flows fully to fill during the potting process, and reducing bubbles generated in dead corners that cannot be covered by epoxy during the process.

[0027] Preferably, the lower end of the first rib 5 extends to contact the bottom surface of the plastic shell 1, and the epoxy resin at the bottom of the plastic shell 1 accumulates to a certain height to cover the lower end of the first rib 5, thereby avoiding a filling dead angle at the lower end of the first rib 5. A guiding slope 7 is provided on the top of the second rib 4 to guide the capacitor core to be inserted into the plastic shell 1, which is conducive to the installation of the capacitor core.

[0028] The second ribs 4 on the two long sides 10 of the molded case 1 cooperate to clamp the two sides of the length direction of the capacitor core, making the position of the capacitor core more stable and avoiding displacement due to the impact of the epoxy resin. Specifically, two second ribs 4 are arranged at intervals along the length direction of the molded case 1 on the inner side of each long side 10 of the molded case 1, and a certain spacing is arranged between the two second ribs 4. This spacing is relatively wide, allowing the epoxy resin to flow smoothly to the bottom of the molded case 1, and the two second ribs 4 form two positioning points on one side of the length direction of the capacitor core. In other embodiments, the number of second ribs 4 on each long side 10 of the molded case 1 is not limited thereto. For example, two second ribs 4 can be arranged on the inner side of one long side 10 of the molded case 1, and only one second rib 4 can be arranged on the other long side 10 of the molded case 1. The three second ribs 4 form a triangular three-point positioning for the capacitor core, or more than three second ribs 4 can be arranged on each long side 10 of the molded case 1.

[0029] The inner bottom surface of the mold case 1 is provided with two rows of first ribs 5 spaced apart along the length direction of the mold case 1, so as to support the two ends of the bottom of the capacitor core to maintain the balance of the capacitor core in the mold case 1. Each row of first ribs 5 includes one (such as Figure 3 ) to a plurality of first ribs 5, two adjacent first ribs 5 in the same row are separated by a notch 6. Figure 2 and Figure 5 In the embodiment, two first ribs 5 are arranged in each row, and the two first ribs 5 are separated by a notch 6. The number of rows of the first ribs 5 is not limited thereto, and may also be increased to three rows, four rows, etc., which are spaced apart from each other, and the number of first ribs 5 in each row is not limited to two. The first ribs 5 are mainly used to ensure the minimum filling thickness of the epoxy resin at the bottom of the plastic shell 1. If other structures are provided in the plastic shell 1 to position the capacitor core, the first ribs 5 may also be arranged in one row. In other embodiments, the first ribs 5 may also have other arrangements, for example, four first ribs 5 that are radially distributed and do not contact each other, or four first ribs 5 that are arranged in an "X" shape.

[0030] The first rib 5 extends from one long side surface 10 of the plastic shell 1 toward the other long side surface 10. The first rib 5 is formed by partially protruding a certain height from the bottom surface of the plastic shell 1. When the bottom surface of the plastic shell 1 is an arc-shaped bottom surface, the first rib 5 is an arc-shaped rib matching the arc-shaped bottom surface. In order to place the plastic shell 1 with an arc-shaped bottom on a horizontal plane, a support foot 8 is provided at the bottom. When the bottom surface of the plastic shell 1 is a plane, the first rib 5 is a straight rib perpendicular to the long side surface 10 of the plastic shell 1.

[0031] Two third ribs 2 are provided in the middle of each short side surface 9 of the plastic shell 1, and the gap between the two third ribs 2 serves as a wire groove 3. The top of the wire groove 3 expands outwards from bottom to top toward both sides into a funnel shape, which is conducive to wiring.

[0032] In order to ensure that the epoxy resin can flow fully, there is a gap of ≥1.0mm between any ribs, thereby reducing the filling dead angle. Preferably, the thickness of the first rib 5, the second rib 4 and the third rib 2 is ≥0.2mm, ensuring that the thickness of any part of the epoxy resin covering the capacitor core is ≥0.2mm. The utility model can reduce the generation of bubbles during potting, improve the consistency of the potting and sealing of the product, and thus improve the moisture resistance and service life of the capacitor.

[0033] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. A capacitor plastic case for improving potting and sealing consistency, comprising a bottom surface and four vertical side surfaces connected to the bottom surface, characterized in that: The two opposite vertical side surfaces located on both sides of the length direction of the plastic shell are defined as long side surfaces, and the two opposite vertical side surfaces located on both sides of the width direction of the plastic shell are defined as short side surfaces. The inner bottom surface of the plastic shell is provided with a plurality of first ribs, the inner sides of the two long side surfaces are provided with a plurality of vertical second ribs, and the inner sides of the two short side surfaces are provided with a plurality of vertical third ribs. The first ribs, the second ribs, and the third ribs are not connected to each other.

2. The capacitor plastic case for improving potting and sealing consistency according to claim 1, characterized in that: Two second ribs are arranged at intervals on the inner side of each long side surface of the plastic shell along the length direction of the plastic shell, and the lower end of the first rib extends to contact the bottom surface of the plastic shell.

3. The capacitor plastic case for improving potting and sealing consistency according to claim 2, characterized in that: A guiding slope is provided on the top of the second rib for guiding the capacitor core to be inserted into the plastic shell.

4. The capacitor plastic case for improving potting and sealing consistency according to claim 1, characterized in that: At least two rows of first ribs are arranged on the inner bottom surface of the plastic shell at intervals along the length direction of the plastic shell, each row of first ribs includes at least two first ribs, and two adjacent first ribs in the same row are separated by grooves, and the extension direction of the first ribs is from one long side surface of the plastic shell toward the other long side surface.

5. The capacitor plastic case for improving potting and sealing consistency according to claim 4, characterized in that: The notch width is ≥1.0 mm.

6. The capacitor plastic case with improved potting and sealing consistency according to claim 1, characterized in that: The bottom surface of the plastic shell is an arc-shaped bottom surface, and the first rib is an arc-shaped rib matching the arc-shaped bottom surface.

7. The capacitor molded case for improving potting and sealing consistency according to claim 1, characterized in that: The bottom surface of the plastic shell is a plane, and the first ribs are straight ribs perpendicular to the long side surfaces of the plastic shell.

8. The capacitor plastic case with improved potting and sealing consistency according to claim 1, characterized in that: Two third ribs are arranged in the middle of each short side surface of the plastic shell, and the gap between the two third ribs serves as a wire groove. The top of the wire groove expands outwards from bottom to top toward both sides into a funnel shape.

9. The capacitor plastic case with improved potting and sealing consistency according to claim 1, characterized in that: The thickness of the first rib, the second rib and the third rib is ≥0.2 mm.

10. The capacitor molded case with improved potting and sealing consistency according to any one of claims 1 to 9, characterized in that: There is a gap of ≥1.0mm between any ribs.

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