An explosion-proof film capacitor

Abstract

This utility model discloses an explosion-proof thin-film capacitor, including a mounting base and heat dissipation grooves for fixing on a mounting surface. The capacitor is mounted on the top of the mounting base. The capacitor includes a shell and a heat dissipation shell located inside the shell for heat dissipation. An insulating shell is located inside the shell, and the capacitor core is located inside the insulating shell. Several sets of heat dissipation grooves are arranged circumferentially and symmetrically inside the heat dissipation shell and the insulating shell. Several heat dissipation strips are connected to the heat dissipation grooves inside the heat dissipation shell. The heat dissipation shell wraps around the insulating shell, and the insulating shell is circumferentially distributed to form a heat dissipation space. The heat dissipation strips in the heat dissipation grooves accelerate heat transfer, and the heat dissipation channel between the insulating shell and the heat dissipation shell further widens the heat flow path. The connecting strips ensure structural stability without hindering heat diffusion. The ventilation grooves on the shell allow for air circulation between the inside and outside, and timely discharge of internal heat. The multiple heat dissipation design effectively avoids heat accumulation and reduces the possibility of dielectric aging and thermal breakdown due to high temperature, thereby reducing the risk of explosion from the root.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor technology, and specifically relates to an explosion-proof film capacitor. Background Technology

[0002] In fields such as power electronics, new energy power generation and industrial control, film capacitors are widely used in key areas such as filtering, energy storage and power factor correction due to their characteristics of high insulation resistance, low loss and strong pulse current resistance. As modern electronic equipment develops towards high power density and miniaturization, the working environment of capacitors is becoming increasingly harsh. They not only need to withstand high-frequency charge and discharge cycles, but are also often in complex working conditions of high temperature and high humidity.

[0003] In existing film capacitors, most practical applications employ a single-shell structure. The heat generated by the capacitor core during operation is mainly dissipated naturally through the shell. This heat tends to accumulate inside, causing the core temperature to rise continuously. Especially in multi-core integrated designs, thermal interference between cores further exacerbates the heat dissipation problem. Prolonged high temperatures not only accelerate dielectric aging but also reduce the capacitor's lifespan and may even lead to thermal breakdown. When dielectric thermal breakdown occurs, a certain amount of gas is generated inside. At this time, the single-shell structure cannot release or diffuse as quickly as liquid or gaseous capacitors. This gas obstruction may cause the internal pressure of the capacitor to rise rapidly, thereby increasing the risk of capacitor explosion. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof thin-film capacitor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an explosion-proof film capacitor, comprising:

[0006] A mounting base is used to fix the capacitor on a mounting surface. The top of the mounting base is equipped with a capacitor. The capacitor includes a housing and a heat sink inside the housing for heat dissipation. The housing contains an insulating shell to prevent leakage of the capacitor core, and the capacitor core is located inside the insulating shell. The mounting base serves as the basic load-bearing structure of the entire capacitor and is mainly used to stably fix it on the mounting surface. Its top supports the capacitor, which includes a housing. The housing contains a heat sink for heat dissipation and an insulating shell to prevent leakage of the capacitor core. The capacitor core is installed inside the insulating shell. The insulating shell provides an independent and safe installation space for the capacitor core, effectively isolating it from external interference and preventing leakage.

[0007] The heat dissipation grooves are provided in several groups, which are arranged circumferentially and symmetrically inside the heat dissipation shell and the insulating shell to dissipate heat from the capacitor core. Several heat dissipation strips for accelerating heat transfer are connected to the heat dissipation grooves inside the heat dissipation shell. The heat dissipation grooves are arranged circumferentially and symmetrically inside the heat dissipation shell and the insulating shell. This distribution method can surround the capacitor core in all directions and efficiently absorb and dissipate the heat generated by the capacitor core during operation.

[0008] Preferably, a heat dissipation channel is provided between the insulating shell and the heat dissipation shell, and several connecting strips are arranged in a circular pattern within the heat dissipation channel. The two ends of the connecting strips are respectively connected to the insulating shell and the heat dissipation shell. The heat dissipation channel provides a path for heat flow, allowing the heat on the insulating shell and the heat dissipation shell to flow smoothly and dissipate outward.

[0009] Preferably, the insulating shell is provided with a mounting groove for mounting the capacitor core. The size of the mounting groove is adapted to the capacitor core, which can tightly wrap the capacitor core and ensure that the capacitor core is stably placed inside the insulating shell.

[0010] Preferably, the outer casing has several circumferential ventilation slots for ventilation and heat dissipation. When the capacitor is working, the ventilation slots can form convection with the outside air, and the heat inside the casing can be carried to the outside through air circulation, thereby realizing the ventilation and heat dissipation function. In combination with heat dissipation slots, heat dissipation strips and other structures, a multi-layer heat dissipation system is formed to further improve the overall heat dissipation effect.

[0011] Preferably, the top of the mounting base is integrally formed with a fixing cylinder and a hollow groove is opened in the center of the fixing cylinder. A positioning seat is connected in the hollow groove, and a straight positioning groove is opened in the center of the positioning seat.

[0012] Preferably, the bottom of the outer casing is connected to a straight positioning post for insertion into a straight positioning groove, so that the capacitor and the mounting base are correctly aligned and installed. During the installation process, the straight positioning post can be accurately inserted into the straight positioning groove. Through this precise insertion and removal, the capacitor and the mounting base can be quickly guided to achieve correct alignment and installation, avoiding misalignment.

[0013] Preferably, the top of the outer shell is connected to a cover plate, and the top of the cover plate is connected to two sets of electrode posts. The electrode posts are electrically connected to the capacitor core. The cover plate can form a sealed protection for the components inside the shell, preventing dust, moisture, etc. from entering the interior and affecting the performance of the components. The top of the cover plate is connected to two sets of electrode posts, which are made of copper or copper alloy, a metal material with excellent conductivity. Their bottoms are electrically connected to the capacitor core through wires or the like. The electrode posts act as a bridge connecting the capacitor to the external circuit, allowing the capacitor core to be connected to the external circuit to realize the transmission and flow of current.

[0014] Preferably, the mounting base has several mounting holes on its surface. The mounting base is fixed to the mounting surface by screws that pass through the mounting holes. When fixing the mounting base, the mounting base can be firmly fixed to the mounting surface by screwing the screws through the mounting holes and into the mounting base. This fixing method can distribute the pressure borne by the mounting base and ensure that the mounting base will not loosen or shift when bearing the overall weight of the capacitor and coping with external vibrations, thus providing a stable and reliable mounting base for the entire capacitor.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The capacitor significantly improves heat dissipation efficiency through the synergistic effect of the multi-layer heat dissipation structure. The heat dissipation shell wraps around the insulating shell, and the insulating shell is distributed in a circle to form a heat dissipation space. The heat dissipation strips in the heat dissipation groove accelerate heat transfer. The heat dissipation channel between the insulating shell and the heat dissipation shell further widens the heat flow path. The connecting strip ensures structural stability without hindering heat diffusion. The ventilation groove on the outer shell enables air circulation between the inside and outside, and timely discharges the internal heat. The multi-layer heat dissipation design effectively avoids heat accumulation and reduces the possibility of dielectric aging and thermal breakdown caused by high temperature, thereby reducing the risk of explosion from the root.

[0017] (2) The insulating shell directly wraps the capacitor core, which can effectively prevent the capacitor core from leaking current and avoid circuit failures or safety accidents caused by leakage current. The reasonable combination of the insulating shell and other components such as the heat dissipation shell ensures heat dissipation without affecting the insulation performance, thus achieving dual protection of heat dissipation and insulation.

[0018] (3) The fixing cylinder, positioning seat and the straight positioning groove on the mounting base cooperate with the straight positioning column on the top of the outer shell to quickly realize the correct alignment and installation of the capacitor and the mounting base, reduce installation errors and improve installation efficiency. The mounting holes on the surface of the mounting base are fixed by screws to ensure that the capacitor is stable and reliable during use and is not easy to loosen.

[0019] (4) The connecting strip connects the insulating shell and the heat dissipation shell, which enhances the stability of the internal structure. The cover plate seals and protects the top of the capacitor, reducing the impact of external dust and moisture on the internal components, reducing the probability of damage caused by structural loosening or external environmental erosion, and extending the service life of the capacitor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the heat dissipation shell and the insulating shell of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the mounting base of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the capacitor of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the insulating shell of this utility model.

[0025] In the diagram: 1. Mounting base; 2. Capacitor; 3. Housing; 4. Heat sink; 5. Insulating shell; 6. Heat dissipation groove; 7. Heat dissipation strip; 8. Heat dissipation channel; 9. Electrode post; 10. Connecting strip; 11. Mounting groove; 12. Ventilation groove; 13. Fixing cylinder; 14. Empty groove; 15. Positioning base; 16. I-shaped positioning groove; 17. I-shaped positioning post; 18. Cover plate; 19. Mounting hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] This utility model provides, for example Figure 1-5 An explosion-proof film capacitor is shown, comprising: a mounting base 1 for fixing a capacitor 2 on a mounting surface; a heat dissipation shell 4 and an insulating shell 5 inside the outer shell 3 of the capacitor 2; the insulating shell 5 provides space for the capacitor core and prevents leakage; and multiple sets of heat dissipation grooves 6 arranged in a circular pattern inside the heat dissipation shell 4 and the insulating shell 5 accelerate the heat transfer of the capacitor core through the heat dissipation grooves 6 and the internal copper heat dissipation strips 7 to achieve heat dissipation function; and the copper heat dissipation strips 7 can efficiently transfer the heat on the heat dissipation shell 4.

[0029] The heat dissipation channel 8 between the insulating shell 5 and the heat dissipation shell 4 provides a path for heat flow. The connecting strips 10 distributed circumferentially within the channel connect the insulating shell 5 and the heat dissipation shell 4, enhancing structural stability, without hindering heat transfer and helping to improve heat dissipation efficiency. Furthermore, the heat dissipation shell 4 is made of aluminum alloy, which not only has high thermal conductivity but also can quickly transfer heat, and is relatively lightweight.

[0030] The mounting slot 11 inside the insulating shell 5 provides dedicated mounting space for the capacitor core, ensuring that the capacitor core is stably placed inside the insulating shell 5 and avoiding positional displacement that could affect its use.

[0031] The ventilation slots 12 arranged on the inner circumference of the outer shell 3 enable air circulation through ventilation, forming an auxiliary heat dissipation path, and further improving the overall heat dissipation effect in conjunction with other heat dissipation structures.

[0032] The integrally formed fixed cylinder 13 and internal hollow groove 14 on the top of the mounting base 1 provide an installation base for the positioning base 15; the straight positioning groove 16 inside the positioning base 15 is used to cooperate with the positioning structure of the outer shell 3 to provide a positioning reference for the alignment and installation of the capacitor 2 and the mounting base 1.

[0033] The straight positioning post 17 on the top of the outer casing 3 can be inserted into the straight positioning groove 16 of the positioning seat 15 of the mounting base 1. Through precise docking, the capacitor 2 and the mounting base 1 are correctly aligned, ensuring accurate installation position.

[0034] The cover plate 18 on the top of the outer casing 3 provides a mounting carrier for the electrode posts 9; the two sets of electrode posts 9 are electrically connected to the capacitor core, serving as a current transmission channel to enable the capacitor 2 to conduct to the external circuit.

[0035] The mounting holes 19 on the surface of the mounting base 1 can be screwed through to firmly fix the mounting base 1 to the mounting surface, providing a stable mounting base for the entire capacitor 2 and ensuring structural stability during use.

[0036] The explosion-proof film capacitor 2 generates heat through the conversion of internal electric field energy during operation. This heat first penetrates into the insulating shell 5 that tightly encloses it. The insulating shell 5 itself has a certain thermal conductivity and, together with the heat dissipation grooves 6, can evenly diffuse the heat into the surrounding heat dissipation channels 8, avoiding local accumulation. The heat dissipation grooves 6 on the surface of the heat dissipation shell 4 contain several heat dissipation strips 7, which increase the contact area between the heat dissipation shell 4 and the surrounding air. The heat is transferred to the outer shell 3 more quickly along the heat dissipation strips 7. Some of the heat is directly dissipated to the external environment through the outer wall of the heat dissipation shell 4, while the other part encounters the ventilation grooves 12 on the outer shell 3. The cold air from the outside can enter the heat dissipation channel 8 through the ventilation grooves 12, forming a natural convection with the hot air in the heat dissipation channel 8. The hot air is discharged from the ventilation grooves 12 with the convection, taking away a large amount of heat. The connecting strip 10 connecting the insulating shell 5 and the heat dissipation shell 4 not only fixes the position of the two, but its aluminum or aluminum alloy material can also help conduct some heat, making the heat dissipation process smoother. Thus, the multiple heat dissipation design effectively avoids heat accumulation.

[0037] Before installing capacitor 2, first fix the mounting base 1 in the required position through the mounting holes 19 on the surface, ensuring that the mounting base 1 itself will not wobble. Then pick up capacitor 2, align the straight positioning post 17 at the bottom of the outer shell 3 with the straight positioning groove 16 on the positioning seat 15 of the mounting base 1. When the positioning post is inserted into the positioning groove, the two shapes match perfectly, which can prevent capacitor 2 from rotating and misaligning during installation, and ensure that key components such as electrode post 9 are facing the correct direction. After being inserted into place, the bottom of capacitor 2 will naturally embed into the fixing cylinder 13 of the mounting base 1. The fixing cylinder 13 wraps around the bottom of capacitor 2 from all sides, further restricting its lateral movement. Finally, after checking that the position is correct, use soldering to fix capacitor 2 to fixing cylinder 13 to prevent the position from changing due to slight vibration during subsequent use.

[0038] The capacitor core installed inside the insulating shell 5 is the core component that realizes the capacitor function. Its internal dielectric can store charge. When the external circuit is connected, the electrode post 9 is like a "wire interface" connecting the inside and outside, connecting the capacitor core to the external circuit. In the circuit, when the voltage fluctuates, the capacitor core can absorb and store excess charge, and release the charge when the voltage drops, playing a filtering role in stabilizing the voltage. In scenarios where instantaneous power supply is required, the stored charge can be released quickly, realizing the function of energy storage and release. At the same time, it can also adjust the voltage and current phase in the circuit, making the use of electrical energy more efficient. The insulating shell 5 that wraps the capacitor core is made of polyvinyl chloride (PVC), which is non-conductive and can isolate the capacitor core from the external heat sink shell 4, outer shell 3 and other components, preventing charge leakage to other components and causing short circuits. After the cover plate 18 is placed on top, it seals the connection point between the electrode post 9 and the capacitor core, preventing dust and moisture from adhering to the connection point and causing poor contact, ensuring that the current can be stably transmitted between the electrode post 9 and the capacitor core, so that the entire circuit function can continue to operate stably.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof film capacitor, characterized by comprising: include: Mounting base (1) is used to fix it on the mounting surface. The top of the mounting base (1) is provided with a capacitor (2). The capacitor (2) includes a housing (3) and a heat sink (4) located inside the housing (3) for heat dissipation. The housing (3) is provided with an insulating shell (5) to prevent leakage of the capacitor core and the capacitor core is located inside the insulating shell (5). The heat dissipation groove (6) is provided in several groups. The several groups of heat dissipation grooves (6) are arranged in a circular and symmetrical manner in the heat dissipation shell (4) and the insulating shell (5) to dissipate the heat of the capacitor core. The heat dissipation groove (6) in the heat dissipation shell (4) is connected to several heat dissipation strips (7) for accelerating heat transfer.

2. The explosion-proof film capacitor of claim 1, wherein: A heat dissipation channel (8) is provided between the insulating shell (5) and the heat dissipation shell (4), and a number of connecting strips (10) are arranged in a circle within the heat dissipation channel (8). The two ends of the connecting strips (10) are respectively connected to the insulating shell (5) and the heat dissipation shell (4).

3. The explosion-proof film capacitor of claim 1, wherein: The insulating shell (5) is provided with a mounting groove (11) for installing the capacitor core.

4. The explosion-proof film capacitor of claim 1, wherein: The outer shell (3) has several ventilation slots (12) arranged in a circular shape inside for ventilation and heat dissipation.

5. The explosion-proof film capacitor of claim 1, wherein: The mounting base (1) has a fixed cylinder (13) integrally formed on the top and a slot (14) is provided in the center of the fixed cylinder (13). A positioning seat (15) is connected in the slot (14) and a straight positioning slot (16) is provided in the center of the positioning seat (15).

6. The explosion-proof film capacitor of claim 1, wherein: The bottom of the outer casing (3) is connected to a straight positioning post (17) for insertion into a straight positioning groove (16) so that the capacitor (2) is correctly aligned and installed with the mounting base (1).

7. The explosion-proof film capacitor of claim 1, wherein: The top of the outer shell (3) is connected to a cover plate (18), and the top of the cover plate (18) is connected to two sets of electrode posts (9), which are electrically connected to the capacitor core.

8. The explosion-proof film capacitor of claim 1, wherein: The mounting base (1) has several mounting holes (19) on its surface. The mounting base (1) is fixed to the mounting surface by screws that pass through the mounting holes (19).

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