High-power capacitor with explosion-proof shell
By applying an explosion-proof material layer on the inner wall of the capacitor case, the problem of the outer shell rupture of the capacitor after breakdown is solved, and the effect of safe energy discharge and enhanced insulation is achieved.
Patent Information
- Application Number
- CN202420605583.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The shell of the existing capacitor is prone to rupture after breakdown and damage, causing the internal structure to fly out of Mars, which lacks safety.
An explosion-proof material layer, including Kevlar fabric or aramid fiber fabric, is adhered to the inner wall of the shell through a liquid adhesive, or is coated with explosion-proof mixed paint, to form a network structure to relieve impact force and avoid shell rupture.
It effectively avoids shell rupture, ensures that the product can safely release energy after breakdown and damage, enhances the safety and insulation of the product, and reduces weight.
Smart Images
Figure CN222507359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of capacitors, in particular to a high-power capacitor with an explosion-proof casing. Background Art
[0002] The structure of a typical pulse capacitor is a capacitor core (made of metallized film or metal foil), internal connecting wires, lead electrodes, shell, and filling material (epoxy resin or polyurethane). Due to the large size and heavy weight of pulse capacitors, the shell of pulse capacitors is generally made of metal non-magnetic stainless steel shell / insulated plastic shell. The interior is generally composed of dozens to hundreds of cores connected in series and parallel to form a core group. In order to meet the requirements of high energy density of capacitors, miniaturization, lightweight, and product safety, how to ensure that the shell does not crack when the product is damaged during breakdown and can be deformed during shell design is a key issue to be solved.
[0003] At present, capacitors at home and abroad are made of conventional stainless steel / insulating plastic shells, or mesh membrane structures are used to design products to ensure that after the product is damaged by breakdown, it will only self-heal and the capacitance will drop without breaking. The lead terminals are installed on the upper cover and directly serve as electrode leads. However, after the product is broken down, the box body will directly break, and the internal structure will have debris and sparks flying out, which is a key problem that the industry urgently needs to solve. Therefore, the shell structure needs to be further improved. Utility Model Content
[0004] The purpose of the utility model is to solve the above-mentioned existing problems and provide a high-power capacitor with an explosion-proof shell with a simple and reasonable structure. Its main function is to release energy and deform the explosion-proof material after the product is broken down and damaged, thereby effectively avoiding the shell from breaking.
[0005] A high-power capacitor with an explosion-proof shell comprises a shell and an upper cover, wherein the shell and the upper cover are assembled and connected to enclose and define a capacitor cavity for accommodating a core group, the upper cover is connected to a lead-out electrode electrically connected to the core group, and the inner wall surface of the shell is bonded to a layer of explosion-proof material.
[0006] The purpose of the utility model can also be solved by the following technical measures:
[0007] As a more specific solution, the explosion-proof material layer includes Kevlar cloth or aramid fiber cloth, and the Kevlar cloth or aramid fiber cloth is adhered to the inner wall surface of the shell by a liquid adhesive.
[0008] As a further solution, the explosion-proof material layer is made by coating or spraying an explosion-proof mixed coating on the inner wall surface of the shell, and the explosion-proof mixed coating is composed of at least Kevlar or aramid fiber mixed with a liquid adhesive.
[0009] As a further solution, a non-liquid adhesive area is provided on the inner wall surface of the shell close to the upper edge, and the width of the non-liquid adhesive area is H1, and is within the range of 20mm≤H1≤50mm.
[0010] As a further solution, the length of the Kevlar cloth or the aramid fiber cloth is at least more than one third of the circumference of the shell.
[0011] As a further solution, the height of the Kevlar fabric or the aramid fiber fabric is greater than the height of the outer shell;
[0012] The middle section of the Kevlar fabric or aramid fiber fabric is attached to the side inner wall of the shell, the bottom section is bent and attached to the bottom inner wall of the shell, and the top section is bent and attached to the upper surface of the core group.
[0013] Furthermore, the Kevlar cloth or aramid fiber cloth wraps two thirds or more of the entire upper surface of the core group.
[0014] As a further solution, a layer of explosion-proof material is bonded to the bottom surface of the upper cover; a non-coating area is provided on the inner wall surface of the outer shell close to the upper edge, the width of the non-coating area is H2, and 10mm≤H2≤20mm.
[0015] As a further solution, the liquid adhesive includes one of electrical insulating paint, plastic glue and resin.
[0016] As a further solution, a notch with a depth consistent with the thickness of the upper cover is provided around the edge of the mouth of the shell, and a boss adapted to be inserted into the notch is correspondingly extended around the edge of the upper cover.
[0017] As a further solution, the shell is made of a metal material in one piece, or the shell is made of an insulating material in one piece; the insulating material includes ABS, PPS, PC and SMC.
[0018] The beneficial effects of the utility model are as follows:
[0019] 1. A layer of explosion-proof material (such as Kevlar or aramid fiber cloth) is pressed on the inner wall of the shell, and the exposed part is bent over to wrap the product group. After the explosion-proof material wraps and seals the core group as a whole, and the potting material is cured, it effectively ensures that the explosion-proof material can lock the product as a whole. After the product is punctured and damaged, the explosion-proof material can release energy and deform, effectively preventing the shell from rupturing.
[0020] 2. When using explosion-proof mixed coatings, mix Kevlar or aramid fiber cloth fibers with coating glue / insulating paint / resin, stir and apply to the inner wall of the shell. After the coating material solidifies, the fiber fibers are pulled and adhered to form a network, which plays a role in relieving pressure under large impact forces and ensures the rupture of the shells.
[0021] 3. By coating or wrapping a circle of explosion-proof material, the insulation inside the shell is increased, avoiding the impact of partial discharge generated by the product under high voltage on the product, effectively ensuring the partial discharge capacity of the product and increasing the insulation.
[0022] 4. The overall design of the insulating shell effectively reduces the weight of the product and the insulation problem of the overall structure of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a structural schematic diagram of Example 1 of the present utility model.
[0024] Figure 2 It is a cross-section and partial enlarged schematic diagram of the capacitor in the utility model.
[0025] Figure 3 It is a schematic diagram of the structure of the non-liquid adhesive area in the utility model.
[0026] Figure 4 This is a schematic diagram of the explosion-proof material layer enclosure structure of the utility model.
[0027] Figure 5 This is a schematic diagram of the expanded structure of the explosion-proof material layer of the utility model.
[0028] Figure 6 Schematic diagram of the bending structure of the explosion-proof material layer of the utility model Figure 1 .
[0029] Figure 7 Schematic diagram of the bending structure of the explosion-proof material layer of the utility model Figure 2 .
[0030] Figure 8 It is a schematic diagram of the exploded connection structure of the upper cover and the outer shell of the utility model.
[0031] Fig. 9 It is a schematic diagram of the matching structure of the potting hole and the insulating pressure relief plate of the utility model.
[0032] Fig.10 This is a structural schematic diagram of Example 2 of the present utility model.
[0033] Fig.11 This is a schematic diagram of the structure of the non-coating area in the utility model. DETAILED DESCRIPTION
[0034] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Embodiment 1:
[0035] like Figure 1 and Figure 2 As shown, a high-power capacitor with an explosion-proof housing comprises a housing 1 and an upper cover 2, wherein the housing 1 and the upper cover 2 are assembled and connected to define a capacitor cavity 101 for accommodating a core group 3, and the upper cover 2 is connected to an extraction electrode 4 electrically connected to the core group 3, and an explosion-proof material layer 5 is attached to the inner wall surface of the housing 1;
[0036] This capacitor is made by pressing a layer of explosion-proof material inside the shell. After the explosion-proof material wraps and seals the core group 3 as a whole, and the potting material is cured, it effectively ensures that the explosion-proof material will lock the product as a whole. After the product is broken down and damaged, the explosion-proof material has a function of releasing energy and deformation, which effectively avoids the shell from breaking.
[0037] In this embodiment, the explosion-proof material layer 5 includes Kevlar cloth or aramid fiber cloth, and the Kevlar cloth or aramid fiber cloth is adhered to the inner wall surface of the shell 1 through a liquid adhesive 6; during production, the liquid adhesive 6 is evenly sprayed on the inner wall surface of the shell using a spray pot, and the thickness of the spray paint is about 0.5 mm. Thereafter, during the adhesion process of the explosion-proof material layer 5, the Kevlar cloth or aramid fiber cloth can be adhered along the inner wall surface of the shell with the help of a pressing fixture that adapts to the shape of the inner cavity of the shell 1.
[0038] In addition, by coating / wrapping a circle of explosion-proof material, the insulation inside the housing 1 is increased, thereby avoiding the influence of partial discharge generated by the product under high voltage on the product, effectively ensuring the partial discharge capacity of the product and increasing the insulation.
[0039] Explosion-proof materials are explosion-proof and fire-proof materials widely used in civil aviation, bulletproof vests, etc. As explosion-proof materials for boxes, they fully meet the needs.
[0040] like Figure 3 As shown, a non-liquid adhesive area A is provided on the inner wall surface of the housing 1 close to the upper edge, and the width of the non-liquid adhesive area A is H1, and is within the range of 20mm≤H1≤50mm; the non-liquid adhesive area A can reserve a position to ensure that the upper cover of the package can be welded after installation.
[0041] In this embodiment, if Figure 4 As shown, the length of the Kevlar cloth or the aramid fiber cloth is at least greater than about half of the outer circumference of the outer shell 1, so that the Kevlar cloth or the aramid fiber cloth can surround the inner surface of the outer shell for more than one and a half circles.
[0042] like Figures 5 to 7As shown, the height of the Kevlar fabric or the aramid fiber fabric is greater than the height of the housing 1;
[0043] The middle section 5a of the Kevlar cloth or aramid fiber cloth is attached to the side inner wall of the shell 1, the bottom section 5b is bent and attached to the bottom inner wall of the shell 1, and the top section 5c is bent and attached to the upper surface of the core group 3, so that the Kevlar cloth or aramid fiber cloth can wrap and seal the core group 3 as a whole, and after the potting material is cured, it is effectively ensured that the explosion-proof material can lock the product as a whole;
[0044] Furthermore, the Kevlar cloth or aramid fiber cloth covers two-thirds or more of the upper surface of the core group 3, and the remaining one-third of the upper surface of the core group 3 is used to expose the welding part.
[0045] The liquid adhesive 6 is preferably one of electrical insulating paint, plastic glue and resin, or other liquid adhesives 6 with the same effect can be used.
[0046] like Figure 8 As shown, a notch 7 with a depth consistent with the thickness of the upper cover 2 is provided around the edge of the mouth of the shell 1, and a boss 8 adapted to be snapped into the notch 7 is correspondingly extended around the edge of the upper cover 2; after the product is assembled, the upper cover is directly snapped into and assembled on the shell 1 before sealing, and the boss 8 and the notch 7 cooperate to effectively ensure the fit between the upper cover 2 and the shell 1, and ensure the welding consistency between the upper cover 2 and the shell 1.
[0047] The depth of the notch 7 is between 6 and 10 mm. On the other hand, the design of the housing 1 and the upper cover 2 can be built-in, snap-in, buckled in, etc., and is not limited to the above-mentioned embodiments.
[0048] The housing 1 may be made of a metal material in one piece, or the housing 1 may be made of an insulating material in one piece; the insulating material includes ABS, PPS, PC and SMC;
[0049] The insulating shell can make the product lightweight. The successful development of this insulating shell structure can reduce the weight of the metal shell by more than 10%. The material density of the stainless steel shell is 7.9g / cm3, and the material density of the insulating plastic is 0.35~1.0g / cm3. The insulating shell material is selected according to the specific situation of the product. Moreover, the volume of the insulating shell can be smaller than that of the metal shell product because there is no insulating design space. In summary, the insulating shell is less than 10% lighter than the metal shell.
[0050] like Fig. 9As shown, the upper cover 2 is provided with at least one potting hole 201, and an insulating pressure relief sheet 9 is directly inserted into the potting hole 201. The insulating pressure relief sheet 9 is installed into the potting hole 201 after the packaging material is poured. A convex ring is designed in the potting hole, and an insulating plate is extended from the bottom of the insulating pressure relief sheet 9 to abut against the convex ring, so that the insulating pressure relief sheet 9 will not fall into the capacitor cavity, and the insulating pressure relief sheet 9 is flush with the surface of the upper cover 2 and tightly matched with the upper cover 2.
[0051] When a large energy impact occurs, the product releases energy through the potting hole 201 (pressure relief hole), pushes out the insulating pressure relief sheet 9, and releases the internal damage energy through the pressure relief hole, effectively ensuring that the product has nowhere to release when a large energy is released. In a closed environment, the product shell will be broken open and split due to the damage explosion, thus providing double-layer explosion-proof protection. Embodiment 2:
[0052] The difference between the second embodiment and the first embodiment is that: Fig.10 and Fig.11 As shown, the explosion-proof material layer 5 is made by coating or spraying an explosion-proof mixed paint on the inner wall surface of the housing 1, and the thickness of the spray paint is about 1-2 mm. The explosion-proof mixed paint is composed of at least Kevlar or aramid fiber mixed with a liquid adhesive 6.
[0053] When using explosion-proof mixed coating, Kevlar or aramid fiber cloth fiber filaments are mixed with electrical insulating paint, or plastic glue, or resin, stirred and then applied to the inner wall surface of the shell 1. After the coating material is cured, the fiber filaments are pulled and adhered to form a network, which plays a role in relieving pressure under large impact force and ensures the rupture between the shells.
[0054] The bottom surface of the upper cover 2 is bonded with a layer of explosion-proof material 5, so that the explosion-proof material layer 5 can also wrap the outer periphery of the core group; the inner wall surface of the outer shell 1 is provided with a non-coating area B close to the upper edge, the width of the non-coating area B is H2, and 10mm≤H2≤20mm, and the non-coating area B ensures the subsequent welding of the upper cover 2.
[0055] The remaining structures and principles of the second embodiment are the same as those of the first embodiment and will not be elaborated on in detail.
[0056] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A high-power capacitor with an explosion-proof housing, comprising a housing (1) and an upper cover (2), wherein the housing (1) and the upper cover (2) are assembled and connected to define a capacitor cavity (101) for accommodating a core group (3), and an extraction electrode (4) electrically connected to the core group (3) is connected to the upper cover (2), characterized in that : The inner wall surface of the housing (1) is fitted with a layer of explosion-proof material (5); The inner wall surface of the shell (1) is provided with a non-liquid adhesive area (A) close to the upper edge, and the width of the non-liquid adhesive area (A) is H1, and is within the range of 20 mm ≤ H1 ≤ 50 mm; The bottom surface of the upper cover (2) is bonded with a layer of explosion-proof material (5); the inner wall surface of the outer shell (1) is provided with a non-coating area (B) close to the upper edge, and the width of the non-coating area (B) is H2, and 10mm≤H2≤20mm; A notch (7) having a depth consistent with the thickness of the upper cover (2) is provided around the edge of the mouth of the shell (1), and a boss (8) adapted to fit into the notch (7) is correspondingly extended around the edge of the upper cover (2).
2. A high-power capacitor with an explosion-proof housing according to claim 1, characterized in that: The housing (1) is made of a metal material in one piece, or the housing (1) is made of an insulating material in one piece.