Metallized polypropylene film axial capacitor

Abstract

The utility model relates to the technical field of axial capacitors, in particular to a metallized polypropylene film axial capacitor, which comprises a capacitor main body, a leading-out terminal and a packaging shell, the capacitor main body is formed by winding two layers of metallized polypropylene film bodies, and an insulating medium layer is arranged between the two layers of metallized polypropylene film bodies. The leading-out terminals are respectively connected to two ends of the capacitor main body and are fixed through welding, and the packaging shell wraps the capacitor main body and is in sealed connection with the leading-out terminals. According to the utility model, the heat conduction core column with the heat conduction groove is arranged in the center of the capacitor main body, and the heat conduction silica gel is filled in the heat conduction core column, so that the heat dissipation performance of the capacitor is obviously improved, the performance attenuation risk caused by overheating is reduced, and the service life of the capacitor is prolonged; multiple heat dissipation channels are formed, and the overall heat dissipation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of axial capacitor technology, and in particular to a metallized polypropylene film axial capacitor. Background Technology

[0002] An axial capacitor is a type of capacitor whose leads are distributed along the axial direction. It usually has a cylindrical appearance and is mainly composed of electrodes and insulating dielectric. Different combinations of electrode and insulating dielectric materials give it a variety of performance characteristics.

[0003] Existing technologies often have the following drawbacks: In the actual use of axial capacitors, heat tends to accumulate during long-term operation, which raises the internal temperature, affects the capacitor's electrical performance parameters, and hinders the normal operation of the circuit, thus failing to meet the usage requirements.

[0004] Therefore, this invention provides a metallized polypropylene film axial capacitor. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of poor heat dissipation in existing axial capacitors by proposing a metallized polypropylene film axial capacitor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a metallized polypropylene film axial capacitor, comprising a capacitor body, lead terminals, and an encapsulation shell. The capacitor body is formed by winding two layers of metallized polypropylene film, with an insulating dielectric layer between the two layers of metallized polypropylene film. The lead terminals are respectively connected to both ends of the capacitor body and fixed by welding. The encapsulation shell is wrapped around the outside of the capacitor body and forms a sealed connection with the lead terminals. A heat-conducting core is provided inside the capacitor body along the axial direction. The heat-conducting core is a hollow cylindrical structure and passes through the central axis of the capacitor body. The encapsulation shell is made of polyimide material, and the outer wall of the encapsulation shell is provided with anti-slip texture.

[0007] The effect achieved by the above components is that the heat generated when the capacitor body is working is conducted to the heat-conducting core column through the metallized polypropylene film body.

[0008] Preferably, the outer wall of the heat-conducting core column has a plurality of spiral heat-conducting grooves evenly distributed, the walls of the spiral heat-conducting grooves are provided with microporous structures, and the micropores are evenly distributed along the length direction of the heat-conducting grooves.

[0009] The effects achieved by the above components are as follows: the heat-conducting grooves on the outer wall of the heat-conducting core increase the contact area with the heat-conducting silicone, thereby improving the heat conduction efficiency; the microporous structure in the heat-conducting grooves can increase the contact area between the heat-conducting silicone and the heat-conducting core and form capillary action to enhance the heat conduction effect.

[0010] Preferably, heat sinks are fixedly connected to both ends of the heat-conducting core post. The heat sinks are annular and coaxial with the heat-conducting core post. The outer diameter of the heat sinks extends to the inner wall of the encapsulation shell. The surface of the heat sinks is coated with a graphene coating.

[0011] The above components achieve the following effects: the heat-conducting core conducts heat to the heat sinks at both ends, the heat sinks contact the inner wall of the packaged shell through reinforcing ribs to dissipate heat to the external environment, and the graphene coating on the surface of the heat sinks further improves the heat dissipation performance.

[0012] Preferably, the inner and outer sides of the thermally conductive core are filled with thermally conductive silicone, and the thermally conductive silicone is in contact with the metallized polypropylene film body through a thermally conductive groove.

[0013] The effect achieved by the above components is that the thermally conductive silicone evenly distributes heat to the entire thermally conductive core.

[0014] Preferably, the inner wall of the encapsulation shell is uniformly provided with multiple reinforcing ribs along the circumference. The cross-section of the reinforcing ribs is trapezoidal. The inner side of the reinforcing ribs is provided with a thermally conductive coating, and the thermally conductive coating is fixedly connected to the outer edge of the heat sink by a thermally conductive adhesive.

[0015] The effect achieved by the above components is that the reinforcing ribs of the encapsulation shell not only provide structural support, but also form additional heat dissipation channels through the thermally conductive coating and the heat sink.

[0016] Preferably, a stress buffer layer is provided at the connection between the lead-out terminal and the capacitor body, and the stress buffer layer is made of a flexible conductive material.

[0017] The effect achieved by the above components is that the moisture-proof sealing rings at both ends of the encapsulation shell can effectively prevent moisture from entering the inside of the capacitor body.

[0018] Preferably, the packaging shell is provided with moisture-proof sealing rings at both ends, and the moisture-proof sealing rings are made of silicone rubber material.

[0019] The effect achieved by the above components is that the stress buffer layer at the lead-out terminal can absorb the thermal stress caused by temperature changes, thereby preventing the connection from breaking.

[0020] In summary:

[0021] In this invention, by setting a heat-conducting core column with heat-conducting grooves at the center of the capacitor body and filling the inside of the heat-conducting core column with heat-conducting silicone, the heat dissipation performance of the capacitor is significantly improved, the risk of performance degradation due to overheating is reduced, and the service life of the capacitor is extended. The heat sink and the reinforcing ribs on the inner wall of the package shell are closely matched to form multiple heat dissipation channels, which improves the overall heat dissipation efficiency. At the same time, the reinforcing ribs enhance the structural strength of the package shell, enabling the capacitor to withstand greater mechanical stress. The stress buffer layer set at the lead-out terminals effectively alleviates the thermal stress caused by temperature changes, improving the reliability of the capacitor in harsh environments. The setting of the moisture-proof sealing ring further enhances the moisture-proof performance of the capacitor, making it suitable for a wider range of applications. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the capacitor body in this utility model;

[0025] Figure 4 In this utility model Figure 1 Another angle of cross-section.

[0026] Legend: 1. Capacitor body; 101. Metallized polypropylene film body; 102. Insulating dielectric layer; 2. Encapsulation shell; 3. Lead-out terminals; 4. Reinforcing ribs; 5. Moisture-proof sealing ring; 6. Thermal conductive core; 7. Spiral thermal conductive groove; 8. Micropores; 9. Stress buffer layer; 10. Thermally conductive silicone; 11. Heat sink. Detailed Implementation

[0027] Reference Figure 1-4 As shown, this utility model provides a technical solution: a metallized polypropylene film axial capacitor, including a capacitor body 1, lead terminals 3 and a package shell 2.

[0028] The following is a detailed explanation of its overall setup and function.

[0029] In this embodiment: the capacitor body 1 is formed by winding two layers of metallized polypropylene film 101, with an insulating dielectric layer 102 between the two layers of metallized polypropylene film 101. Lead terminals 3 are respectively connected to both ends of the capacitor body 1 and fixed by welding. The encapsulation shell 2 wraps around the capacitor body 1 and forms a sealed connection with the lead terminals 3. A heat-conducting core 6 is arranged axially inside the capacitor body 1. The heat-conducting core 6 has a hollow cylindrical structure and penetrates the central axis of the capacitor body 1. The encapsulation shell 2 is made of polyimide material, and its outer wall has an anti-slip texture. The heat generated by the capacitor body 1 during operation is conducted to the heat-conducting core 6 through the metallized polypropylene film 101.

[0030] Specifically, the outer wall of the heat-conducting core 6 has multiple spiral heat-conducting grooves 7 evenly distributed. The inner wall of the spiral heat-conducting grooves 7 has a micropore structure 8, and the micropores 8 are evenly distributed along the length of the heat-conducting grooves. The heat-conducting grooves on the outer wall of the heat-conducting core 6 increase the contact area with the thermally conductive silicone 10, thereby improving the heat conduction efficiency. The micropore structure 8 in the heat-conducting grooves can increase the contact area between the thermally conductive silicone 10 and the heat-conducting core 6 and form capillary action to enhance the heat conduction effect. Heat sinks 11 are fixedly connected to both ends of the heat-conducting core 6. The heat sinks 11 are annular and coaxial with the heat-conducting core 6. The outer diameter of the heat sinks 11 extends to the inner wall of the encapsulation shell 2, and the surface of the heat sinks 11 is coated with a graphene coating. The heat-conducting core 6 conducts heat to the heat sinks 11 at both ends. The heat sinks 11 contact the inner wall of the encapsulation shell 2 through the reinforcing ribs 4, thereby dissipating the heat to the external environment. The graphene coating on the surface of the heat sinks 11 further improves the heat dissipation performance. The inner and outer sides of the thermally conductive core 6 are filled with thermally conductive silicone 10, and the thermally conductive silicone 10 contacts the metallized polypropylene film body 101 through thermally conductive grooves. The thermally conductive silicone 10 evenly distributes heat to the entire thermally conductive core 6. Multiple reinforcing ribs 4 are evenly arranged circumferentially on the inner wall of the encapsulation shell 2. The reinforcing ribs 4 have a trapezoidal cross-section, and a thermally conductive coating is provided on the inner side of the reinforcing ribs 4. The thermally conductive coating is fixedly connected to the outer edge of the heat sink 11 by a thermally conductive adhesive. The reinforcing ribs 4 of the encapsulation shell 2 not only provide structural support but also form additional heat dissipation channels through the thermally conductive coating and the heat sink 11. A stress buffer layer 9 is provided at the connection between the lead-out terminal 3 and the capacitor body 1, and the stress buffer layer 9 is made of flexible conductive material. The moisture-proof sealing rings 5 ​​at both ends of the encapsulation shell 2 effectively prevent moisture from entering the capacitor body 1. The moisture-proof sealing rings 5 ​​at both ends of the encapsulation shell 2 are made of silicone rubber. The stress buffer layer 9 at the lead-out terminal 3 can absorb thermal stress caused by temperature changes, thereby preventing breakage at the connection.

[0031] Working principle: When the capacitor body 1 is working, the heat generated is conducted to the heat-conducting core 6 through the metallized polypropylene film body 101. The heat-conducting grooves on the outer wall of the heat-conducting core 6 increase the contact area with the heat-conducting silicone 10, thereby improving the heat conduction efficiency. The heat-conducting silicone 10 evenly distributes the heat to the entire heat-conducting core 6. The heat-conducting core 6 conducts the heat to the heat sinks 11 at both ends. The heat sinks 11 contact the inner wall of the encapsulation shell 2 through the reinforcing ribs 4, thereby dissipating the heat to the external environment. The micropore structure 8 in the heat-conducting groove can increase the contact area between the heat-conducting silicone 10 and the heat-conducting core 6 and form a capillary effect to enhance the heat conduction effect. The graphene coating on the surface of the heat sink 11 further improves the heat dissipation performance. The reinforcing ribs 4 of the encapsulation shell 2 not only play a structural support role, but also form an additional heat dissipation channel through the heat-conducting coating and the heat sink 11. The stress buffer layer 9 at the lead-out terminal 3 can absorb the thermal stress caused by temperature changes, thereby avoiding the breakage at the connection. The moisture-proof sealing rings 5 ​​at both ends of the encapsulation shell 2 can effectively prevent moisture from entering the interior of the capacitor body 1.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A metallized polypropylene film axial capacitor, comprising a capacitor body (1), lead terminals (3), and a package shell (2), characterized in that: The capacitor body (1) is formed by winding two layers of metallized polypropylene film body (101), and an insulating dielectric layer (102) is provided between the two layers of metallized polypropylene film body (101). The lead terminals (3) are respectively connected to the two ends of the capacitor body (1) and fixed by welding. The encapsulation shell (2) is wrapped around the outside of the capacitor body (1) and forms a sealed connection with the lead terminals (3). A heat-conducting core column (6) is provided inside the capacitor body (1) along the axial direction. The heat-conducting core column (6) is a hollow cylindrical structure and passes through the central axis of the capacitor body (1). The encapsulation shell (2) is made of polyimide material, and the outer wall of the encapsulation shell (2) is provided with anti-slip texture.

2. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: The outer wall of the heat-conducting core (6) is uniformly distributed with multiple spiral heat-conducting grooves (7), and the inner wall of the spiral heat-conducting grooves (7) is provided with micropore (8) structure, and the micropores (8) are uniformly distributed along the length of the heat-conducting groove.

3. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: The heat-conducting core (6) is fixedly connected to heat sinks (11) at both ends. The heat sinks (11) are annular and coaxial with the heat-conducting core (6). The outer diameter of the heat sinks (11) extends to the inner wall of the encapsulation shell (2). The surface of the heat sinks (11) is coated with a graphene coating.

4. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: The inner and outer sides of the thermally conductive core (6) are filled with thermally conductive silicone (10), and the thermally conductive silicone (10) is in contact with the metallized polypropylene film body (101) through the thermally conductive groove.

5. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: The inner wall of the encapsulation shell (2) is uniformly provided with multiple reinforcing ribs (4) along the circumference. The cross section of the reinforcing rib (4) is trapezoidal. The inner side of the reinforcing rib (4) is provided with a thermally conductive coating, and the thermally conductive coating is fixedly connected to the outer edge of the heat sink (11) by a thermally conductive adhesive.

6. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: A stress buffer layer (9) is provided at the connection between the lead-out terminal (3) and the capacitor body (1), and the stress buffer layer (9) is made of a flexible conductive material.

7. The metallized polypropylene film axial capacitor according to claim 1, characterized in that: The packaging shell (2) is provided with moisture-proof sealing rings (5) at both ends, and the moisture-proof sealing rings (5) are made of silicone rubber material.

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