Capacitor explosion-proof housing
The multi-stage pressure relief design, combining the explosion vent sleeve and the guide sleeve, solves the problems of uncontrollable pressure relief direction and large impact force of the capacitor, realizing rapid, safe and controllable pressure relief of the capacitor, simplifying the maintenance process and improving the stability and reliability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU HUIFENG ELECTRON CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-16
AI Technical Summary
Existing capacitor pressure relief devices have uncontrollable pressure relief direction, large impact force, and are inconvenient to maintain, making it difficult to balance safety, reliability, and maintainability.
The system employs a combination structure of explosion relief sleeve and guide sleeve. Initial pressure relief is achieved through the plastic deformation of the pressure relief plate, and secondary directional explosion relief is achieved through the controllable deformation or fracture of the top cover, forming a multi-stage and controllable pressure relief process.
It enables rapid, safe, and controllable pressure relief of capacitors, reduces the impact on the surrounding environment, simplifies the maintenance process, and improves the stability and reliability of the system.
Smart Images
Figure CN224366683U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, specifically to an explosion-proof capacitor housing. Background Technology
[0002] In power electronic equipment, capacitors, as key components for energy storage and filtering, are widely used in power, electric vehicles, and renewable energy fields. With the continuous increase in power density and operating voltage, the internal dielectric of capacitors often experiences rapid gas expansion or even rupture due to overvoltage, overtemperature, or internal short circuits. To reduce the hazards to surrounding equipment and personnel in the event of a capacitor rupture, current technology typically installs a single-stage rupture disc or fuse on the capacitor casing, releasing internal pressure directly through pressure relief holes on the top or side.
[0003] A typical structure of existing pressure relief devices includes a metal casing and a top rupture disc assembly. The rupture disc breaks when the internal pressure exceeds a set threshold, thereby opening the pressure relief channel. While this type of structure can mitigate the impact of an explosion to some extent, it still has the following shortcomings:
[0004] The direction of pressure release is uncontrollable. After the single-stage rupture disc opens, high-pressure gas and materials are ejected in random directions along the fracture surface of the disc, which can easily cause secondary damage to adjacent equipment and personnel.
[0005] The pressure relief process is violent and has a large impact force. The internal pressure is released all at once, resulting in a transient pulse impact that causes significant damage to the system and the surrounding environment. Existing devices do not have optimized designs for pressure relief components and multi-stage pressure relief, making it difficult to balance safety, reliability, and maintainability.
[0006] In summary, there is an urgent need for a capacitor explosion-proof housing structure that can achieve multi-level, controllable, and easy reset, in order to solve the problems of uncontrollable pressure relief direction, large impact force, and inconvenient maintenance in the existing technology. Utility Model Content
[0007] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.
[0008] Therefore, the technical solution adopted by this utility model is as follows: an explosion-proof capacitor housing, comprising a capacitor body, an explosion-proof sleeve fitted on its outer surface, and a guide sleeve covering the outside of the explosion-proof sleeve. The bottom end of the explosion-proof sleeve has a flange ring welded and sealed to the bottom end of the guide sleeve. Several pressure relief grooves are equidistantly formed on the outer circumference of the explosion-proof sleeve, and a plastic pressure relief plate is installed at each pressure relief groove. The top end of the explosion-proof sleeve is provided with a connecting seat, and the top cover is sealed and abutted against the top end of the guide sleeve through the connecting seat. In the event of a capacitor malfunction, this structure first achieves initial pressure relief through the deformation of the pressure relief plate in the explosion-proof sleeve, and then completes secondary directional explosion relief through controlled deformation of the top cover of the guide sleeve.
[0009] In a preferred example, the explosion relief bushing and the capacitor body are fitted with a sliding sleeve to ensure easy installation and excellent airtight performance;
[0010] In a preferred example, the guide sleeve is made of high-strength aluminum alloy by die casting and has a seamless structure to improve compressive strength and corrosion resistance;
[0011] In a preferred example, a uniform gap of 0.5 to 2.0 mm is maintained between the outer periphery of the explosion relief sleeve and the inner side of the guide sleeve to ensure that the gas and material can flow smoothly into the guide sleeve after initial depressurization.
[0012] In a preferred example, there are four pressure relief grooves, which are equidistantly distributed along the outer periphery of the explosion relief sleeve, with the center angle between two adjacent pressure relief grooves being 90°, so as to achieve a stable and uniform initial pressure relief effect.
[0013] In a preferred example, the pressure relief plate is made of stainless steel plate with a thickness of 0.5 to 1.0 mm and a bending yield strength of not less than 350 MPa at room temperature, so as to achieve controllable initial pressure relief through plastic deformation;
[0014] In a preferred example, a limiting ring is provided at the top of the coupling seat, and a flexible O-ring is provided between the limiting ring and the top cover to maintain the top sealing performance until a predetermined rupture pressure is reached;
[0015] In a preferred example, when the pressure at the top of the inner cavity of the guide sleeve continues to rise, the top cover undergoes controllable deformation or fracture under the action of the limiting ring, guiding the high-pressure gas to vent in a directional manner along the axial direction of the guide sleeve.
[0016] Specifically, this utility model, through the aforementioned multi-stage controllable explosion relief structure, achieves a continuous and safe explosion relief process from the initial pressure relief of the pressure relief plate to the secondary directional opening of the top cover. It can quickly and effectively release internal pressure, control the direction of pressure relief, reduce the impact on the external environment, and allow for the reset or replacement of related components to ensure the system's sustainable use.
[0017] The beneficial effects achieved by this utility model are as follows:
[0018] 1. In this utility model, through the plastic deformation of the explosion relief sleeve and the pressure relief plate, as well as the secondary directional opening of the top cover of the guide sleeve, a multi-stage, safe and controllable explosion relief protection is formed. It can quickly release the internal pressure when the capacitor explodes abnormally, and effectively guide the high-pressure gas and substances to be discharged in a predetermined direction, significantly reducing secondary damage to the surrounding environment and equipment.
[0019] 2. The present invention has a compact and reasonable structural design. The pressure relief plate is made of high-strength stainless steel, and the guide sleeve is made of seamless aluminum alloy die casting and is equipped with a high-temperature resistant flexible O-ring seal. It has high safety, durability and maintainability, which not only improves the stability and reliability of the system, but also simplifies the maintenance and reset process and reduces the subsequent maintenance cost. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;
[0021] Figure 2 This is a schematic diagram of the surface structure of the explosion relief sleeve according to an embodiment of the present invention;
[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the explosion relief sleeve and guide sleeve according to an embodiment of the present invention.
[0023] Figure label:
[0024] 100. Capacitor body; 200. Explosion relief sleeve; 201. Pressure relief groove; 202. Connecting seat; 210. Pressure relief plate; 300. Guide sleeve; 400. Top cover. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.
[0026] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.
[0027] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing an explosion-proof capacitor housing.
[0028] Combination Figures 1-3 As shown, the present invention provides an explosion-proof capacitor housing, comprising: a capacitor body 100, an explosion-proof sleeve 200, and a conductive sleeve 300.
[0029] Capacitor body 100: It is a metal or metal alloy shell of a conventional capacitor, and contains a capacitor core and electrode structure inside.
[0030] Explosion relief sleeve 200: Its inner diameter matches the outer surface of the capacitor body 100. The explosion relief sleeve 200 is slidably fitted outside the capacitor body 100. The bottom end of the explosion relief sleeve 200 is provided with a flange ring. The flange ring is sealed to the bottom end of the guide sleeve 300 by welding to ensure the airtightness of the system under normal conditions.
[0031] Guide sleeve 300: Sleeve over the explosion relief sleeve 200 to provide a directional discharge channel during the explosion relief process.
[0032] The above structure enables the initial pressure relief to be initiated by the explosion relief sleeve 200 when the capacitor body 100 is abnormal, and then the directional explosion relief is achieved by the guide sleeve 300, thereby protecting the surrounding environment and equipment safety.
[0033] In this embodiment, the guide sleeve 300 is made of high-strength aluminum alloy by die casting and has a seamless integrated structure to improve the strength and corrosion resistance of the guide sleeve 300 under high pressure.
[0034] In this embodiment, a gap is provided between the outer periphery of the explosion relief sleeve 200 and the inner side of the guide sleeve 300. This gap ensures that during initial depressurization, the gas can pass smoothly through the flow channel between the outer periphery of the explosion relief sleeve 200 and the inner side of the guide sleeve 300. The top cover 400 achieves sealing by abutting against the top of the guide sleeve 300.
[0035] In this embodiment, a uniform gap of 0.5 to 2.0 mm is maintained between the outer periphery of the explosion relief sleeve 200 and the inner cavity of the guide sleeve 300 to ensure that high-pressure gas and substances can flow smoothly in the annular gap without blockage after the pressure relief groove 201 is opened.
[0036] In this embodiment, the pressure relief plate 210 is made of stainless steel plate with a thickness of 0.5 to 1.0 mm, and the bending yield strength of the stainless steel plate at room temperature is not less than 350 MPa. The initial pressure relief function is achieved through the plastic deformation of the material.
[0037] In this embodiment, there are four pressure relief grooves 201, which are evenly distributed along the outer periphery of the explosion relief sleeve 200. The center angle between two adjacent pressure relief grooves 201 is 90°. Each pressure relief groove 201 has a pressure relief plate 210 at its opening for sealing and opening.
[0038] In this embodiment, a limiting ring is provided at the top of the coupling seat 202, and a flexible O-ring is installed between the limiting ring and the top cover 400. The O-ring is made of high-temperature resistant fluororubber material to improve the sealing performance of the top and ensure that the top cover 400 remains well sealed until the predetermined rupture pressure when it is deformed and opened.
[0039] Furthermore, when the guide sleeve 300 deforms and bends due to excessive internal pressure, the limiting ring can limit the maximum opening range of the top cover 400, thereby controlling the direction and opening of the secondary explosion venting and completing directional discharge.
[0040] Working principle and usage process of this utility model:
[0041] Pressure relief trigger: When an abnormality occurs inside the capacitor body 100, such as rapid accumulation of internal gas or heat, the internal pressure pushes the pressure relief plate 210 inside the explosion relief sleeve 200 to produce plastic deformation.
[0042] As the pressure relief plate 210 deforms, the pressure relief groove 201 immediately opens, allowing the internal gas and substances to escape through the annular gap between the outer periphery of the explosion relief sleeve 200 and the inner side of the guide sleeve 300, thus achieving initial pressure relief and guidance.
[0043] Secondary directional explosion relief: When the internal pressure continues to rise and acts on the top of the inner cavity of the guide sleeve 300, the top cover 400 undergoes controllable deformation or fracture at the joint seat 202. The top cover 400 opens through deformation and bending, allowing pressure and materials to be discharged axially along the guide sleeve 300, completing the secondary directional explosion relief of the entire system and ensuring that hazardous materials do not spread in undesirable directions.
[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A capacitor explosion-proof housing, characterized in that, include: The capacitor body (100), the explosion relief sleeve (200), and the guide sleeve (300) are fitted onto the surface of the capacitor body (100), and the bottom end of the explosion relief sleeve (200) is provided with a flange ring, which is welded and sealed to the bottom end of the guide sleeve (300); the surface of the explosion relief sleeve (200) is provided with several pressure relief grooves (201), and each pressure relief groove (201) is provided with a pressure relief plate (210); the top end of the explosion relief sleeve (200) is provided with a connecting seat (202), and the top cover (400) is fixed to the top surface of the explosion relief sleeve (200) through the connecting seat (202), and the outer periphery of the top cover (400) is sealed and abutted against the top end of the inner cavity of the guide sleeve (300).
2. The explosion-proof capacitor housing according to claim 1, characterized in that, The guide sleeve (300) is made of high-strength aluminum alloy by die casting and has a seamless sleeve structure.
3. The explosion-proof capacitor housing according to claim 1, characterized in that, A gap is provided between the outer periphery of the explosion relief sleeve (200) and the inner side of the guide sleeve (300); the top cover (400) is used to seal the top end of the guide sleeve (300).
4. The explosion-proof capacitor housing according to claim 1, characterized in that, A uniform gap of 0.5 to 2.0 mm is maintained between the outer periphery of the explosion relief sleeve (200) and the inner cavity of the guide sleeve (300).
5. The explosion-proof housing for capacitors according to claim 1, characterized in that, The pressure relief plate (210) is made of stainless steel plate with a thickness of 0.5 to 1.0 mm.
6. The explosion-proof capacitor housing according to claim 1, characterized in that, The number of pressure relief grooves (201) is four, which are evenly distributed along the outer periphery of the explosion relief sleeve (200), and the center angle between two adjacent pressure relief grooves (201) is 90°.
7. The explosion-proof capacitor housing according to claim 1, characterized in that, The top of the coupling seat (202) is provided with a limiting ring, and a flexible O-ring is provided between the limiting ring and the top cover (400).