Explosion-proof metallized film capacitor shell

Abstract

The utility model relates to an explosion-proof metallized film capacitor housing, which comprises an inner layer housing, an outer layer housing, an outer layer housing, an inner layer housing, an outer layer housing, an outer layer housing, an inner layer housing, an outer layer housing and an inner layer housing from inside to outside in sequence, and is characterized in that the side wall of the inner layer housing is of a corrugated structure, and radial explosion pressure is converted into circumferential and axial combined stress through the corrugated structure to form an initial pressure relief channel; the buffer layer is of a porous structure formed by foaming, and pores are filled with a dry powder extinguishing agent; the interception layer is of a net-shaped structure; and the thickness of the side wall of the outer shell is gradually reduced from top to bottom. Explosion stress is dispersed through the corrugated structure of the inner-layer shell, the buffer layer absorbs energy and releases a fire extinguishing agent, the interception layer blocks fragments, and the outer-layer shell releases pressure directionally, so that multi-stage protection is achieved; the inner-layer corrugated structure guides linear expansion of cracks by forming a weak area, so that the shell is prevented from being exploded and broken; when the buffer layer is pressed and deformed, the dry powder extinguishing agent is released to restrain the fire behavior; the corrugated structure and the net-shaped intercepting layer act together to effectively absorb mechanical impact.

Description

Technical Field

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

[0002] Metallized film capacitors, as key electronic components widely used in electronic devices, power systems, and many other fields, play a vital role in various circuits due to their significant advantages such as high insulation resistance, low loss, and good self-healing properties. However, in practical applications, metallized film capacitors can fail or even explode due to various factors. These factors include, but are not limited to, excessive voltage, excessive high-frequency current, insufficient voltage withstand, and poor capacitor quality.

[0003] Traditional capacitor casing designs primarily focus on providing basic physical protection and insulation. However, these designs have significant shortcomings in explosion-proof performance. For example, they cannot effectively buffer the impact of an explosion, making the casing prone to cracking and allowing internal substances such as electrolytes or impregnating liquids to splatter everywhere, posing a significant safety hazard. Firstly, traditional casings lack effective control mechanisms for releasing internal pressure. When a capacitor explodes internally, the high voltage can cause the casing to rupture, sending fragments flying and seriously threatening the safety of surrounding equipment and personnel. Secondly, traditional casings have limited ability to prevent the spread of fire. Once a fire starts inside the capacitor, flames and smoke can spread rapidly, triggering a larger-scale fire accident. Utility Model Content

[0004] This utility model addresses the problems of existing technologies by providing an explosion-proof metallized film capacitor housing, the specific technical solution of which is as follows:

[0005] An explosion-proof metallized film capacitor housing includes, from the inside out, the following components arranged sequentially:

[0006] The inner shell has a corrugated sidewall structure, which converts the radial explosion pressure into a combined circumferential and axial stress and forms an initial pressure relief channel.

[0007] A buffer layer, wherein the buffer layer is a porous structure formed by foaming, and the pores are filled with dry powder fire extinguishing agent;

[0008] An interception layer, wherein the interception layer has a mesh structure;

[0009] The outer shell, whose sidewall thickness decreases from top to bottom, is used to guide the explosive energy to be released downwards.

[0010] As a further technical solution of this utility model, the corrugated sidewall of the inner shell includes alternating crest portions and trough portions, wherein the thickness of the trough portion is less than that of the crest portion, forming a weak area to preferentially break and guide crack propagation.

[0011] As a further technical solution of this utility model, the interception layer is woven from carbon fiber or stainless steel wire.

[0012] As a further technical solution of this utility model, the material of the buffer layer is polyurethane foam, and its porosity is controlled by the foaming process to adapt to different explosion energy absorption requirements.

[0013] The beneficial effects of this utility model are as follows:

[0014] (1) In this application, the inner shell corrugated structure disperses the explosion stress, the buffer layer absorbs energy and releases the extinguishing agent, the interception layer blocks the debris, and the outer shell directionally relieves pressure, thus achieving multi-level protection.

[0015] (2) In this application, the inner corrugated structure guides the linear propagation of cracks by forming a weak area, thus avoiding the shell from bursting; the outer shell is designed with decreasing thickness to release energy in a directional manner, thereby reducing the risk of lateral impact.

[0016] (3) In this application, when the buffer layer is deformed by pressure, it will release dry powder fire extinguishing agent to suppress the fire; the corrugated structure and the mesh interception layer work together to absorb mechanical impact and protect the internal components. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of an explosion-proof metallized film capacitor housing is shown.

[0018] Figure 2 A schematic diagram of the inner shell structure is shown;

[0019] Figure 3 A schematic diagram of the structure of the crest and trough portions is shown;

[0020] Figure 4 A schematic diagram of the outer shell structure is shown.

[0021] Legend:

[0022] 100, Inner shell; 110, Crest portion; 120, Trough portion; 200, Buffer layer; 300, Interception layer; 400, Outer shell. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0024] Figure 1 A schematic diagram of the overall structure of an explosion-proof metallized film capacitor housing is shown. Figure 1 The explosion-proof metallized film capacitor housing includes an inner shell 100, a buffer layer 200, an interception layer 300, and an outer shell 400 arranged sequentially from the inside to the outside.

[0025] Figure 2 A schematic diagram of the inner shell 100 is shown; Figure 2 In the inner shell 100, the sidewalls have a corrugated structure. The inner shell 100 is made of aluminum alloy and is integrally formed by casting. Through the design of the corrugated structure, the radial explosion pressure is converted into circumferential and axial composite stress, which can evenly distribute the pressure generated inside the capacitor and avoid shell breakage caused by local stress concentration. According to the principles of mechanics, the shape of the corrugations can change the stress transmission path, making the pressure more evenly distributed on the entire inner shell 100. Compared with ordinary flat shells, it can withstand higher internal pressure without damage. Moreover, when the pressure exceeds the threshold, the continuous rupture of the corrugations gradually releases energy, forming an initial pressure relief channel, avoiding shell shattering caused by instantaneous high pressure, thus solving the problem of traditional flat shells directly breaking into multiple high-speed fragments. At the same time, when the capacitor is subjected to external impact, the corrugated structure can play a certain buffering role, absorbing some of the impact energy and protecting the internal capacitor elements from damage.

[0026] Figure 3 A schematic diagram of the structure of the crest portion 110 and the trough portion 120 is shown; Figure 3 In the inner shell 100, the corrugated sidewall has alternating crest portions 110 and trough portions 120. As the inner shell 100 extends from the crest portion 110 to the trough portion 120, the thickness of the inner shell 100 decreases to form a weak area at the trough portion 120. By forming a weak area at the trough portion 120, deformation and fracture can occur first, ensuring that cracks propagate preferentially along the line connecting the trough portions 120 during an explosion, forming a regular linear fracture surface. This significantly attenuates the impact effect on both ends and can transmit the impact force laterally, preventing displacement of the entire capacitor.

[0027] See also Figure 1 The buffer layer 200 is used to absorb the energy of the explosion. The buffer layer 200 is a porous structure formed by foaming, and the pores are filled with dry powder extinguishing agent. The foam material has a porous structure, which can be compressed and deformed when subjected to external impact, absorbing a large amount of energy, thereby reducing the impact on the internal capacitor elements and the external structure. In addition, the extinguishing material filled inside is quickly sprayed out and released when the foam material is squeezed and deformed, covering the internal capacitor, effectively inhibiting the spread of fire and reducing the risk of fire. The buffer layer 200 is made of polyurethane foam material, which has good flexibility and buffering performance, and can effectively absorb and disperse energy.

[0028] See also Figure 1 The interception layer 300 is a mesh structure woven from carbon fiber or stainless steel wire. When an explosion occurs inside the capacitor, the mesh structure of the interception layer 300 can intercept the debris and splashes generated by the explosion, preventing them from damaging the surrounding environment and equipment.

[0029] When woven with stainless steel wire, it exhibits high strength and excellent corrosion resistance, effectively blocking debris and spatter from internal explosions within the capacitor. Furthermore, its mesh structure design ensures sufficient gas flow porosity while effectively blocking large fragments.

[0030] When woven from carbon fiber, the material exhibits high strength and low density, enabling it to withstand significant impacts. Simultaneously, it possesses electromagnetic shielding capabilities, effectively reducing the adverse effects of electromagnetic interference on surrounding equipment.

[0031] Figure 4 A schematic diagram of the outer shell 400 is shown; Figure 4 In the middle, the thickness of the side wall of the outer shell 400 decreases from top to bottom; the design of the side wall thickness decreasing from top to bottom conforms to the mechanical principle, which can reduce the weight of the shell while ensuring the overall strength of the shell; when an explosion occurs inside the capacitor, this structural design can guide the explosion energy and gas to be released downward, avoiding upward spray that could cause damage to surrounding equipment and personnel, making the release direction of the explosion energy more controllable and minimizing the damage range.

[0032] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A type of explosion-proof metallized film capacitor housing, characterized in that, Including those set from the inside out: The inner shell (100) has a corrugated sidewall structure, which converts the radial explosion pressure into a combined circumferential and axial stress and forms an initial pressure relief channel. The buffer layer (200) is a porous structure formed by foaming, and the pores are filled with dry powder fire extinguishing agent; An interception layer (300) having a mesh structure; The outer shell (400) has a sidewall thickness that decreases from top to bottom, which is used to guide the explosive energy to be released downwards.

2. The explosion-proof metallized film capacitor housing according to claim 1, characterized in that: The corrugated sidewall of the inner shell (100) includes alternating crest portions (110) and trough portions (120), wherein the thickness of the trough portions (120) is less than that of the crest portions (110), forming a weak region to preferentially fracture and guide crack propagation.

3. The explosion-proof metallized film capacitor housing according to claim 2, characterized in that: The intercepting layer (300) is woven from carbon fiber or stainless steel wire.

4. The explosion-proof metallized film capacitor housing according to claim 3, characterized in that: The buffer layer (200) is made of polyurethane foam, and its porosity is controlled by the foaming process to adapt to different explosion energy absorption requirements.

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