Direct-current support capacitor device with anti-falling cylindrical aluminum shell
By using the limiting ring structure design of the external and internal aluminum shells and filling with epoxy insulation material, the problem of easy peeling at the interface between the epoxy material and the aluminum shell is solved, thus preventing the capacitor from detaching from the shell and enhancing the stability and reliability of the capacitor.
Patent Information
- Application Number
- CN202520309041.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The epoxy material at the interface between the existing DC-supported capacitor and the aluminum shell is easily peeled off, causing the capacitor core to separate from the aluminum shell, which poses a risk of shell detachment.
The design employs an outer aluminum shell and an inner aluminum shell with a retaining ring structure, combined with epoxy insulation material filling, to form an anti-detachment structure. The retaining ring of the outer aluminum shell locks into the retaining ring of the inner aluminum shell, and the retaining ring of the inner aluminum shell abuts against the bottom of the capacitor, enhancing the fixing effect.
It effectively prevents the internal aluminum shell and capacitor from falling off, ensuring the stability and reliability of the capacitor and reducing the impact of thermal expansion and contraction on the contact interface.
Smart Images
Figure CN223977806U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of DC support capacitor technology, and in particular to a DC support capacitor device with an anti-detachment cylindrical aluminum shell. Background Technology
[0002] DC-DC capacitors, widely used in photovoltaics, wind power generation, and industrial frequency converters, are mostly cylindrical aluminum shells encapsulated with epoxy resin. Epoxy material undergoes exothermic solidification from a liquid state, resulting in slight volume shrinkage. This causes inward shrinkage stress at the interface between the epoxy and the aluminum shell. Furthermore, the thermal shrinkage of non-metallic materials differs from that of metallic materials. Environmental temperature changes and alternating hot and cold cycles during capacitor use cause the epoxy to gradually peel away from the aluminum shell, leading to delamination. In severe cases, the epoxy-encapsulated capacitor core can separate completely from the aluminum shell. Utility Model Content
[0003] In order to solve the problems existing in the prior art, the present invention provides a DC support capacitor device with an anti-detachment cylindrical aluminum shell.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] A DC support capacitor device with an anti-detachment cylindrical aluminum shell includes an outer aluminum shell 1, an inner aluminum shell 2, and a DC support capacitor 3. The inner aluminum shell 2 is sleeved inside the outer aluminum shell 1, and the DC support capacitor 3 is sleeved inside the inner aluminum shell 2.
[0006] This utility model also has the following additional technical features:
[0007] As a further specific optimization of the technical solution of this utility model: the outer aluminum shell 1 includes an outer aluminum shell body 101, the outer aluminum shell body 101 being hollow cylindrical in shape; the top of the outer aluminum shell body 101 is provided with an inwardly recessed first positioning and limiting ring 102; the bottom of the outer aluminum shell body 101 is provided with a DC support capacitor terminal limiting groove 103.
[0008] As a further specific optimization of the technical solution of this utility model: the inner aluminum shell 2 includes an inner aluminum shell body 201, the inner aluminum shell body 201 being hollow cylindrical in shape; the top of the inner aluminum shell body 201 is provided with an outwardly protruding second positioning and limiting ring 202; the second top of the inner aluminum shell body 201 is provided with an inwardly recessed third positioning and limiting ring 203.
[0009] As a further specific optimization of the technical solution of this utility model: the gap between the outer aluminum shell 1 and the inner aluminum shell 2 is filled with an insulating protective layer 4, and the insulating protective layer 4 is made of epoxy insulating material.
[0010] Compared with the prior art, the advantages of this utility model are:
[0011] Because the aluminum shell has a certain degree of elasticity, the inner aluminum shell 2 is fitted inside the outer aluminum shell 1, so that the first positioning and limiting ring 102 of the outer aluminum shell 1 locks the second positioning and limiting ring 202 of the inner aluminum shell 2, which can effectively prevent the inner aluminum shell 2 from falling off.
[0012] The top of the inner aluminum shell body 201 is provided with a second positioning and limiting ring 202 protruding outward, which fits the DC support capacitor 3 into the inner aluminum shell 2, so that the third positioning and limiting ring 203 of the inner aluminum shell 2 abuts against the bottom of the DC support capacitor 3, which can effectively prevent the DC support capacitor 3 from falling out of the inner aluminum shell 2. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the anti-detachment cylindrical aluminum shell structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the external aluminum shell 1 of this utility model;
[0015] Figure 3 This is a schematic diagram of the internal aluminum shell 2 structure of this utility model.
[0016] Explanation of reference numerals in the attached diagram: outer aluminum shell 1, inner aluminum shell 2, and DC support capacitor 3. Detailed Implementation
[0017] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.
[0018] A DC support capacitor device with an anti-detachment cylindrical aluminum shell includes an outer aluminum shell 1, an inner aluminum shell 2, and a DC support capacitor 3. The inner aluminum shell 2 is fitted inside the outer aluminum shell 1, and the DC support capacitor 3 is fitted inside the inner aluminum shell 2. Both the outer aluminum shell 1 and the inner aluminum shell 2 are made of high-strength aluminum alloy, which has good mechanical properties and corrosion resistance, and can effectively protect the internal DC support capacitor 3.
[0019] The outer aluminum shell 1 includes an outer aluminum shell body 101, which is generally in the shape of a hollow cylinder. The top of the outer aluminum shell body 101 is provided with an inwardly recessed first positioning and limiting ring 102. The bottom of the outer aluminum shell body 101 is provided with a DC support capacitor terminal limiting groove 103, and the terminal can be inserted into the DC support capacitor terminal limiting groove 103 to further stabilize the position of the DC support capacitor 3.
[0020] The inner aluminum shell 2 includes an inner aluminum shell body 201, which is generally in the shape of a hollow cylinder; the top of the inner aluminum shell body 201 is provided with a second positioning and limiting ring 202 protruding outward; the second top of the inner aluminum shell body 201 is provided with a third positioning and limiting ring 203 recessed inward.
[0021] Because the aluminum shell has a certain degree of elasticity, the inner aluminum shell 2 is fitted inside the outer aluminum shell 1, so that the first positioning and limiting ring 102 of the outer aluminum shell 1 locks the second positioning and limiting ring 202 of the inner aluminum shell 2, which can effectively prevent the inner aluminum shell 2 from falling off.
[0022] The top of the inner aluminum shell body 201 is provided with a second positioning and limiting ring 202 protruding outward, which fits the DC support capacitor 3 into the inner aluminum shell 2, so that the third positioning and limiting ring 203 of the inner aluminum shell 2 abuts against the bottom of the DC support capacitor 3, which can effectively prevent the DC support capacitor 3 from falling out of the inner aluminum shell 2.
[0023] An insulating protective layer 4, made of epoxy insulating material, is filled in the gap between the outer aluminum shell 1 and the inner aluminum shell 2. The thickness of the insulating protective layer 4 can be adjusted according to actual needs to ensure insulation performance while minimizing the impact on heat dissipation of the DC support capacitor 3.
[0024] A method for installing a DC-supported capacitor device with an anti-detachment cylindrical aluminum shell:
[0025] The DC support capacitor 3 is fitted inside the inner aluminum shell 2, and the inner aluminum shell 2 is fitted inside the outer aluminum shell 1. The first positioning and limiting ring 102 of the outer aluminum shell 1 locks the second positioning and limiting ring 202 of the inner aluminum shell 2. The third positioning and limiting ring 203 of the inner aluminum shell 2 abuts against the bottom of the DC support capacitor 3. Then, epoxy insulating material is filled in the gap between the outer aluminum shell 1 and the inner aluminum shell 2. After curing, an insulating protective layer 4 is formed.
[0026] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.
Claims
1. A DC support capacitor device having a retention preventing cylindrical aluminum case, characterized by: It includes an outer aluminum shell (1), an inner aluminum shell (2) and a direct current support capacitor (3), the inner aluminum shell (2) is sleeved in the inner part of the outer aluminum shell (1), and the direct current support capacitor (3) is sleeved in the inner part of the inner aluminum shell (2); The outer aluminum shell (1) includes an outer aluminum shell body (101), and the outer aluminum shell body (101) is in a hollow cylindrical shape as a whole; a first positioning limiting ring (102) is arranged on the top of the outer aluminum shell body (101) and is recessed inward; a direct current support capacitor terminal limiting groove (103) is arranged on the bottom of the outer aluminum shell body (101); The inner aluminum shell (2) includes an inner aluminum shell body (201), and the inner aluminum shell body (201) is in a hollow cylindrical shape as a whole; a second positioning limiting ring (202) is arranged on the top of the inner aluminum shell body (201) and is protruded outward; a third positioning limiting ring (203) is arranged on the sub-top of the inner aluminum shell body (201) and is recessed inward; An insulating protective layer (4) is filled in the gap between the outer aluminum shell (1) and the inner aluminum shell (2), and the material of the insulating protective layer (4) is an epoxy insulating material.