A safety explosion-proof capacitor

Abstract

This utility model relates to the field of capacitor technology, specifically a safe explosion-proof capacitor, including a capacitor shell, electrodes disposed on the top of the capacitor shell, and a capacitor core assembly disposed inside the capacitor shell. An inner immersion box is fixedly installed on the outer wall of the capacitor core assembly. The capacitor core assembly and the electrodes are connected by wires. An insulating box is fixedly installed on the top of the inner wall of the capacitor shell, and the wires pass through the top and bottom surfaces of the insulating box. Several taut rings are fixedly installed on the bottom and top surfaces of the insulating box near the outer wall of the wires, with the taut rings forming a group of two. This utility model, through the setting of the cutting slider, can automatically and accurately cut off the internal circuit when the capacitor core assembly is about to explode due to a fault, thereby achieving physical power cut-off, fundamentally eliminating the risk of the fault continuing to worsen, effectively preventing the capacitor shell from exploding, and significantly improving its safety.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically to a safe explosion-proof capacitor. Background Technology

[0002] With continuous technological breakthroughs, the rated voltage and capacitance of metallized film capacitors are steadily increasing, and their energy density per unit volume and mass is also significantly improved. This progress has directly led to a substantial enhancement in the energy storage capacity of capacitors, enabling them not only to efficiently perform traditional functions such as filtering, buffering, and coupling, but also to play a crucial role in energy storage, pulse power, and system stability control.

[0003] Existing technology, such as publication number "CN211319940U", discloses a safety explosion-proof capacitor, including: a capacitor shell, electrodes disposed on the top surface of the capacitor shell, a capacitor core assembly disposed inside the capacitor shell, and a cut-off box; the capacitor shell is filled with flame-retardant resin; the cut-off box is filled with an insulating impregnating agent; the cut-off box is located between the internal terminals of the electrodes and the capacitor core assembly; the internal terminals of the electrodes are connected to the capacitor core assembly via wires and through the cut-off box, and the wires inside the cut-off box have cuts. In the event of a fault, the wires of this patent break at the cuts inside the cut-off box, causing the capacitor to be in an open-circuit state, and the insulating impregnating agent inside the cut-off box prevents the faulty capacitor from being re-energized under high voltage conditions due to arcing.

[0004] However, in this capacitor, the space between the cores is filled with solid resin material. When the capacitor fails, the top surface of the casing deforms and bulges, potentially tearing the internal wires through the force of the bulge. However, because the solid resin material causes the bulging area to be affected by heat during a failure, it may not be close to the cut point on the wire. This prevents the explosion-proof device, which is fixed in a position, from activating as expected, thus causing the explosion-proof device to fail. Therefore, we propose a safe explosion-proof capacitor. Utility Model Content

[0005] The purpose of this invention is to solve the problem of inaccurate activation of explosion-proof devices, thereby providing a safe explosion-proof capacitor.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An explosion-proof safety capacitor includes a capacitor housing, electrodes disposed on the top of the capacitor housing, and a capacitor core assembly disposed inside the capacitor housing. An inner immersion box is fixedly installed on the outer wall of the capacitor core assembly. The capacitor core assembly is connected to the electrodes via wires. An insulating box is fixedly installed on the top of the inner wall of the capacitor housing, and the wires pass through the top and bottom surfaces of the insulating box. Several straightening rings are fixedly installed on the bottom and top surfaces of the insulating box near the outer wall of the wires, with the several straightening rings forming a group of two. A cutting slider is slidably installed on the inner wall of the insulating box. An air bladder is disposed on the back of the cutting slider, and a conduit is connected to the bottom surface of the air bladder.

[0008] Preferably, the interior of the immersion box is filled with water that is submerged in the outer wall of the capacitor core assembly, and there is a certain gap between the water inside the immersion box and the top surface of the inner wall of the immersion box.

[0009] Preferably, the section of the wire inside the insulating box is a taut section, and the interior of the insulating box is divided into three cavities by a partition. The cut of the cutting slider contacts the taut section of the wire.

[0010] Preferably, the end of the conduit furthest from the airbag is connected to the interior of the immersion box.

[0011] Preferably, the inner wall of the capacitor casing is coated with flame-retardant resin, and the outer wall of the capacitor core assembly is coated with a waterproof coating.

[0012] Preferably, the straightened section of the conductor is an exposed copper wire, and the two ends connecting the capacitor core assembly and the electrode are covered with insulating rubber. Each set of straightening rings straightens the straightened section of the conductor.

[0013] By employing the above technical solution, this utility model provides a safe explosion-proof capacitor. Its beneficial effects are: by setting up a cutting slider, this utility model can automatically and precisely cut off the internal circuit when the capacitor core is at the critical point where a fault is about to cause an explosion, thereby achieving physical power disconnection, fundamentally eliminating the risk of the fault continuing to worsen, effectively preventing the capacitor casing from bursting, and significantly improving its safety. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0015] Figure 1 This is a front view schematic diagram of the explosion-proof safety capacitor of this utility model;

[0016] Figure 2 This is a front cross-sectional view of the explosion-proof safety capacitor of this utility model;

[0017] Figure 3This is a cross-sectional schematic diagram of the explosion-proof capacitor in this embodiment.

[0018] In the diagram: 1. Capacitor casing; 2. Electrode; 3. Inner immersion box; 4. Capacitor core assembly; 5. Wire; 51. Straightening section; 6. Insulation box; 7. Straightening ring; 8. Cutting slider; 9. Airbag; 10. Conduit. Detailed Implementation

[0019] 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.

[0020] Example 1

[0021] A type of explosion-proof capacitor, such as Figures 1-3 As shown, the capacitor includes a capacitor housing 1, an electrode 2 disposed on the top of the capacitor housing 1, a capacitor core assembly 4 disposed inside the capacitor housing 1, an inner immersion box 3 fixedly installed on the outer wall of the capacitor core assembly 4, the capacitor core assembly 4 and the electrode 2 being connected by a wire 5, an insulating box 6 fixedly installed on the top of the inner wall of the capacitor housing 1, and the wire 5 passing through the top and bottom surfaces of the insulating box 6, a plurality of straightening rings 7 fixedly installed on the bottom and top surfaces of the insulating box 6 near the outer wall of the wire 5, and the plurality of straightening rings 7 being in groups of two, a cutting slider 8 slidably installed on the inner wall of the insulating box 6, an air bladder 9 disposed on the back of the cutting slider 8, and a conduit 10 connected to the bottom surface of the air bladder 9.

[0022] The interior of the inner immersion box 3 is filled with water that is submerged in the outer wall of the capacitor core assembly 4, and there is a certain gap between the water inside the inner immersion box 3 and the top surface of the inner wall of the inner immersion box 3.

[0023] The section of wire 5 inside the insulating box 6 is called the straight section 51. The interior of the insulating box 6 is divided into three cavities by a partition. The cut of the cutting slider 8 contacts the straight section 51 of wire 5.

[0024] The end of the conduit 10 away from the airbag 9 is connected to the interior of the inner immersion box 3.

[0025] The inner wall of the capacitor casing 1 is coated with flame-retardant resin, and the outer wall of the capacitor core assembly 4 is coated with a waterproof coating.

[0026] The straightened section 51 of the conductor 5 is made of exposed copper wire. The two ends connected to the capacitor core group 4 and the electrode 2 are covered with insulating rubber. Each set of straightening rings 7 straightens the straightened section 51 of the conductor 5.

[0027] In the present invention, a safety explosion-proof capacitor operates normally, with current flowing through the conductor 5 inside the capacitor. When the capacitor malfunctions, the capacitor core assembly 4 generates high temperatures. Because water is submerged on the outer wall of the core assembly 4, and the contact surface area between the water and the outer wall is large, the water temperature rises rapidly. This rapid temperature rise generates steam, increasing the air pressure at the top of the inner immersion box 3. The steam pressure enters the air bladder 9 in the insulating box 6 through the conduit 10. The air bladder 9 creates lateral expansion tension, causing the cutting slider 8 to slide along the inner wall of the insulating box 6 towards the straightened section 51 of the conductor 5. Because the straightening ring 7 tightly holds the straightened section 51 of the conductor 5... The straightening process allows the cutting slider 8 to slide continuously to the left, while also providing cutting force to the taut section 51 of the wire 5. When the cutting force reaches a certain threshold, the exposed copper wire is cut and broken, causing the wire 5 connected to the bottom of the electrode 2 to be split into two ends, blocking the connection between the electrode 2 and the capacitor core group 4. When the capacitor core group 4 is about to explode due to a fault, the internal circuit can be automatically and precisely cut off, thereby achieving physical power cut-off, fundamentally eliminating the risk of the fault continuing to worsen, effectively preventing the capacitor shell 1 from bursting, and significantly improving its safety.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A safety explosion-proof capacitor comprising a capacitor housing (1), an electrode (2) arranged on the top of the capacitor housing (1), and a capacitor core set (4) arranged inside the capacitor housing (1), characterized in that: An inner immersion box (3) is fixedly installed on the outer wall of the capacitor core assembly (4). The capacitor core assembly (4) is connected to the electrode (2) by a wire (5). An insulating box (6) is fixedly installed on the top of the inner wall of the capacitor shell (1). The wire (5) passes through the top and bottom surfaces of the insulating box (6). Several straightening rings (7) are fixedly installed on the bottom and top surfaces of the insulating box (6) near the outer wall of the wire (5). The several straightening rings (7) are in pairs. A cutting slider (8) is slidably installed on the inner wall of the insulating box (6). An air bladder (9) is provided on the back of the cutting slider (8). A conduit (10) is connected to the bottom surface of the air bladder (9).

2. A safety explosion-proof capacitor according to claim 1, characterized in that: The interior of the immersion box (3) is filled with water that is submerged in the outer wall of the capacitor core assembly (4), and there is a certain gap between the water inside the immersion box (3) and the top surface of the inner wall of the immersion box (3).

3. A safety explosion-proof capacitor according to claim 1, characterized in that: The section of the conductor (5) inside the insulating box (6) is a straight section (51). The interior of the insulating box (6) is divided into three cavities by a partition. The cut of the cutting slider (8) is in contact with the straight section (51) of the conductor (5).

4. The explosion-proof capacitor according to claim 1, characterized in that: The end of the conduit (10) away from the airbag (9) is connected to the interior of the immersion box (3).

5. The explosion-proof capacitor according to claim 1, characterized in that: The inner wall of the capacitor casing (1) is coated with flame-retardant resin, and the outer wall of the capacitor core assembly (4) is coated with a waterproof coating.

6. The explosion-proof capacitor according to claim 1, characterized in that: The straightened section (51) of the conductor (5) is an exposed copper wire, and the two ends connected to the capacitor core group (4) and the electrode (2) are covered with insulating rubber. Each set of straightening rings (7) straightens the straightened section (51) of the conductor (5).

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