Aluminum electrolytic capacitor with double-layer rubber plug

Abstract

An aluminum electrolytic capacitor with a double-layer rubber plug comprises a shell, a core package and the rubber plug, and the core package is arranged in the shell in a sealed mode through the rubber plug. The rubber plug comprises a base layer and a solvent-resistant layer, and the solvent-resistant layer comprises a nitrile rubber layer or a silicone rubber layer; the base layer and the solvent-resistant layer are connected through a binder; the solvent-resistant layer is arranged on the side, away from the core bag, of the rubber plug. According to the utility model, the solvent-resistant layer is arranged on one side, far away from the core package, of the rubber plug, so that the solvent-resistant layer can resist corrosion of cooling liquid during liquid cooling, and the core package can be ensured to be sealed in the shell.

Description

Technical Field

[0001] The utility model relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor with a double-layer rubber plug suitable for liquid cooling. Background Art

[0002] Aluminum electrolytic capacitors are widely used in power filtering, circuit coupling, energy storage and other fields. In server applications, liquid cooling technology is usually used to reduce the temperature of the server. At this time, aluminum electrolytic capacitors need to have good solvent resistance to resist the erosion of coolants such as fluorinated liquids or alkane mineral oils, and ensure that the rated life is achieved.

[0003] The key factor in the life of liquid aluminum electrolytic capacitors lies in the rubber plug. Traditional rubber plugs are generally made of butyl rubber, which will react with coolants such as fluorinated liquid or alkane mineral oil in a liquid cooling environment, thereby affecting the sealing effect of the rubber plug on the core package; therefore, whether the rubber plug can maintain coolant resistance for a long time has become an important issue in the development of such products. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an aluminum electrolytic capacitor with a double-layer rubber plug suitable for liquid cooling.

[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is: an aluminum electrolytic capacitor with a double-layer rubber plug, characterized in that: it includes an outer shell, a core package and a rubber plug, and the core package is sealed in the outer shell by the rubber plug; the rubber plug includes a base layer and a solvent-resistant layer, and the solvent-resistant layer includes a nitrile rubber layer or a silicone rubber layer; the base layer and the solvent-resistant layer are connected by an adhesive; the solvent-resistant layer is arranged on the side of the rubber plug away from the core package.

[0006] In the above-mentioned aluminum electrolytic capacitor with double-layer rubber stopper, preferably, the thickness of the solvent-resistant layer is 1-3 mm.

[0007] In the above-mentioned aluminum electrolytic capacitor with double-layer rubber plug, preferably, a hydrophobic protrusion structure is formed on the side of the solvent-resistant layer away from the core package, and the protrusion structure includes densely distributed protrusions, the height of the protrusions is 5-15μm, and the gaps between the protrusions are 10-15μm.

[0008] In the above-mentioned aluminum electrolytic capacitor with double-layer rubber plug, preferably, a hydrophobic protrusion structure is formed on the side of the base layer close to the core package, and the protrusion structure includes densely distributed protrusions, the height of the protrusions is 5-15μm, and the gap between the protrusions is 10-15μm.

[0009] The above-mentioned aluminum electrolytic capacitor with double-layer rubber plug is preferably formed with a layer of hydrophobic protruding structure on the side of the solvent-resistant layer away from the core package and the side of the base layer close to the core package, and the protruding structure includes densely distributed protrusions, the height of the protrusions is 5-15μm, and the gaps between the protrusions are 10-15μm.

[0010] The aluminum electrolytic capacitor with double-layer rubber plug described above is preferably provided with a waisted extruded base layer on the shell.

[0011] Compared with the prior art, the utility model has the advantage that a solvent-resistant layer is arranged on the side of the rubber plug away from the core package, so that during liquid cooling, the solvent-resistant layer can resist the erosion of the coolant and ensure that the core package is sealed in the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the aluminum electrolytic capacitor with a double-layer rubber plug in Example 1.

[0013] Legend

[0014] 1. Shell; 2. Core bag; 3. Rubber plug; 31. Nitrile rubber layer; 32. Butyl rubber layer. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0016] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.

[0017] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model. Example 1

[0018] like Figure 1The aluminum electrolytic capacitor with a double-layer rubber plug 3 shown in the figure comprises a shell 1, a core package 2 and a rubber plug 3, wherein the core package 2 is sealed and arranged in the shell 1 through the rubber plug 3; the rubber plug 3 comprises a base layer and a solvent-resistant layer, and the base layer and the solvent-resistant layer are connected by an adhesive. The solvent-resistant layer can be a nitrile rubber layer 31 or a silicone rubber layer, and the present embodiment takes the nitrile rubber layer as an example; the nitrile rubber layer 31 is arranged on the side of the rubber plug 3 away from the core package 2. In the present embodiment, the thickness of the nitrile rubber layer 31 is 1-3 mm.

[0019] In this embodiment, the base layer is a butyl rubber layer 32. In this embodiment, as a preferred method, the thickness of the butyl rubber layer 32 is greater than 3 mm, and the waist formed on the shell 1 is squeezed on the butyl rubber layer 32. In this embodiment, since the thickness of the nitrile rubber layer 31 is only 1-3 mm, and the width of the waist is often greater than 3 mm, it is difficult for the waist to squeeze the rubber plug 3 entirely on the nitrile rubber layer 31, which will inevitably squeeze the junction of the nitrile rubber layer 31 and the butyl rubber layer 32, so that the nitrile rubber layer 31 and the butyl rubber layer 32 crack due to stress, thereby affecting the sealing between the rubber plug 3 and the shell 1.

[0020] In this embodiment, if the thickness of the butyl rubber layer 32 is smaller than the width of the waist, the waist is set at the middle of the rubber plug 3 as much as possible, and the waist depth of the rubber plug 3 is preferably less than 2 mm.

[0021] In this embodiment, nitrile rubber has excellent oil resistance, especially in terms of fuel oil and aromatic solvents, so nitrile rubber can resist the erosion of coolants such as fluorinated liquids or alkane mineral oils, and is therefore suitable for use in a coolant environment.

[0022] However, nitrile rubber is not resistant to media such as ketones, esters and hydrogen chloride, and has poor tear resistance and wear resistance, while butyl rubber performs better in these aspects. Therefore, in this embodiment, a layer of butyl rubber is arranged on the inner side of the nitrile rubber. The air permeability of butyl rubber is better than that of nitrile rubber, thereby ensuring the product life.

[0023] In the utility model, a solvent-resistant layer is arranged on the side of the rubber plug 3 away from the core package 2 , so that during liquid cooling, the solvent-resistant layer can resist the erosion of the coolant and ensure that the core package 2 is sealed in the housing 1 . Example 2

[0024] In this embodiment, one type of electrolyte of the aluminum electrolytic capacitor is an aqueous electrolyte, which is generally used in low-voltage products; and there is 5%-45% water in the aqueous electrolyte. When the power is on, the butyl rubber will react slowly with the water, which will cause the sealing effect between the rubber plug 3 and the shell 1 to deteriorate over time. In this embodiment, a layer of hydrophobic protruding structure is formed on the side of the butyl rubber layer facing the core package 2, and the protruding structure includes dense protrusions, the height of the protrusions is 5-15μm, and the gap between the protrusions is 10-15μm. Wax crystals or Teflon crystals with a diameter of 0.1 nm-50nm are formed on the protrusions, and the wax crystals or Teflon crystals are hydrophobic. Air is filled between the protrusions of the protruding structure, forming an extremely thin air film, and the wax crystals or Teflon crystals on the protrusions form a hydrophobic effect on the surface of the butyl rubber layer facing the core package 2.

[0025] In this embodiment, the solvent-resistant layer takes a nitrile rubber layer as an example; in order to ensure the hydrophobicity of the outer surface of the nitrile rubber layer 31, that is, the surface away from the core package 2, a layer of hydrophobic protruding structure can also be formed on the outer surface of the nitrile rubber layer 31, the protruding structure includes densely distributed protrusions, the height of the protrusions is also 5-15μm, and the gap between the protrusions is also 10-15μm.

[0026] In this embodiment, the hydrophobic protruding structure may exist on the nitrile rubber layer 31 alone, or on the butyl rubber layer alone, or on both the nitrile rubber layer 31 and the butyl rubber layer. The rest of this embodiment is the same as that of the first embodiment.

Claims

1. An aluminum electrolytic capacitor with a double-layer rubber plug, characterized in that: It comprises an outer shell, a core package and a rubber plug, wherein the core package is sealed in the outer shell by the rubber plug; the rubber plug comprises a base layer and a solvent-resistant layer, wherein the solvent-resistant layer comprises a nitrile rubber layer or a silicone rubber layer; the base layer and the solvent-resistant layer are connected by an adhesive; and the solvent-resistant layer is arranged on a side of the rubber plug away from the core package.

2. The aluminum electrolytic capacitor with double-layer rubber plug according to claim 1, characterized in that: The thickness of the solvent-resistant layer is 1-3 mm.

3. The aluminum electrolytic capacitor with double-layer rubber plug according to claim 1, characterized in that: A layer of hydrophobic protrusion structure is formed on the side of the solvent-resistant layer away from the core package. The protrusion structure includes densely distributed protrusions. The height of the protrusions is 5-15 μm, and the gaps between the protrusions are 10-15 μm.

4. The aluminum electrolytic capacitor with double-layer rubber plug according to claim 1, characterized in that: A layer of hydrophobic protrusion structure is formed on the side of the base layer close to the core package. The protrusion structure includes densely distributed protrusions. The height of the protrusions is 5-15 μm, and the gap between the protrusions is 10-15 μm.

5. The aluminum electrolytic capacitor with double-layer rubber plug according to claim 1, characterized in that: A layer of hydrophobic protrusion structure is formed on the side of the solvent-resistant layer away from the core package and on the side of the base layer close to the core package. The protrusion structure includes dense protrusions. The height of the protrusions is 5-15 μm, and the gaps between the protrusions are 10-15 μm.

6. The aluminum electrolytic capacitor according to any one of claims 1 to 5, characterized in that: A waisted extruded base layer is formed on the shell.

Images