CN214043429U

CN214043429U - Built-in heat sink for dry-type low-voltage shunt power capacitors

Info

Publication number: CN214043429U
Application number: CN202120206118.5U
Authority: CN
Inventors: 于丰华; 王定康; 许童羽; 张子义
Original assignee: Shenyang Yifeng Electrical Appliance Co ltd; Shenyang Agricultural University
Current assignee: Shenyang Yifeng Electrical Appliance Co ltd; Shenyang Agricultural University
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-08-24
Anticipated expiration: 2031-01-26

Abstract

A built-in heat dissipation device of a dry-type low-voltage parallel power capacitor relates to the field of low-voltage electrical appliances, and includes a wire, a capacitor core, a lead-out terminal, insulating highland paper, aluminum foil, and a metal shell. Wrap the cable paper as insulation, and then add more than one circle of highland barley paper between the core package and the metal shell to strengthen the insulation effect between the core package and the shell. The oil-filled insulating cable paper is wrapped, and then placed between the end faces of the two cores of the capacitor, and the other end of the aluminum foil is drawn out between the metal casing and the insulating highland barley paper. lead to good cooling effect. After experiments, taking the 0.45‑30‑3 dry capacitor as an example, after adding the internal dissipation device, the temperature rise is reduced by 6-8℃.

Description

Built-in heat radiator for dry low-voltage parallel power capacitor

Technical Field

The utility model relates to a low-voltage apparatus field, exactly it is the parallelly connected power capacitor's of dry-type low pressure built-in heat abstractor, can improve the parallelly connected electric capacity radiating efficiency of dry-type low pressure.

Background

The oil-immersed low-voltage parallel capacitor is radiated by liquid, the packaging medium of the dry low-voltage parallel capacitor takes the insulativity into consideration and also takes the heat conduction performance into consideration, the insulation performance is difficult to be balanced, the source of temperature rise through measurement is mainly a capacitor core, the heat of the core is concentrated on the electrode ends at two ends, and the heat of the end faces needs to be conducted to the surface of a metal shell to be radiated. The heat dissipation path is the medium between the end face of the core and the shell, the oil-immersed product medium is liquid oil with good heat dissipation, and the dry product medium is solid or gas with low heat dissipation efficiency.

Disclosure of Invention

The utility model aims at providing a parallelly connected power capacitor's of dry-type low pressure built-in heat abstractor for solve the heat dissipation problem of the parallelly connected condenser of dry-type low pressure. The method is characterized in that the aluminum foil is added to serve as a heat dissipation medium, the good heat conductivity of the aluminum foil is utilized to effectively transmit the heat of the core to the inner wall of the metal shell of the capacitor, and the heat is dissipated through the outer surface of the metal shell. However, the aluminum foil is conductive and requires insulation on the portion in contact with the core and the portion adjacent to the inner wall of the housing is exposed.

The technical scheme of the utility model is that: the utility model provides a built-in heat abstractor of parallelly connected power capacitor of dry-type low pressure, including the wire, the condenser core, leading-out terminal, insulating highland barley paper, the aluminium foil, and metal casing, the core is connected with external terminal through the welding wire, the condenser core wraps up cable paper outward and is as insulating, add more than the highland barley paper of round again between core package and metal casing, strengthen the insulating effect between core package and the shell, the insulating highland barley paper outside is hugged closely the metal casing inner wall, aluminium foil one end is wrapped up with the insulating cable paper that soaks oil, then place between two core terminal surfaces of condenser, the aluminium foil other end is drawn out in the metal casing and between the insulating highland barley paper. Namely, the heat dissipation foil is wrapped well by cable paper and insulated, one end of the heat dissipation foil is placed between the two cores, the other end of the heat dissipation foil is led out to the position between the insulated highland barley paper in the metal shell, and the aluminum foil between the highland barley paper and the inner wall of the shell is completely exposed. The exposed aluminum foil is tightly attached to the inner wall of the metal shell of the capacitor under the stress action of the insulating highland barley paper. The utility model discloses an add the one deck aluminium foil between original insulating highland barley paper and metal casing, lead to the radiating effect good. Through experiments, taking a dry capacitor of 0.45-30-3 as an example, after the internal bulk is added, the temperature rise is reduced by 6-8 ℃.

The utility model has the advantages that, no matter liquid or the good solid of heat conduction and gas do not have the heat conductivity of metal aluminium foil good from heat conduction coefficient, do the heat-dissipating medium with the aluminium foil, insulativity is solved with immersion oil back cable paper parcel, the aluminium foil of doing insulating is in between the electric capacity core terminal surface its temperature should be close with the core terminal surface, utilize the good heat conductivity of aluminium foil itself to conduct the heat of core to condenser metal casing inner wall effectively, the surface through metal casing gives off.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the prior art.

Fig. 3 is a partially enlarged schematic view of fig. 1.

In the figure, 1 is a metal shell, 2 is an aluminum foil, 3 is insulating highland barley paper, 4 is a capacitor core, and A, B, C is an external connection terminal.

Detailed Description

The utility model provides a built-in heat abstractor of parallelly connected power capacitor of dry-type low pressure, including the wire, the condenser core, leading-out terminal, insulating highland barley paper, the aluminium foil, and metal casing, the core is connected with external terminal through the welding wire, the condenser core wraps up cable paper outward and is as insulating, add more than the highland barley paper of round again between core package and metal casing, strengthen the insulating effect between core package and the shell, the insulating highland barley paper outside is hugged closely the metal casing inner wall, aluminium foil one end is wrapped up with the insulating cable paper that soaks oil, then place between two core terminal surfaces of condenser, the aluminium foil other end is drawn out in the metal casing and between the insulating highland barley paper. Namely, the heat dissipation foil is wrapped well by cable paper and insulated, one end of the heat dissipation foil is placed between the two cores, the other end of the heat dissipation foil is led out to the position between the insulated highland barley paper in the metal shell, and the aluminum foil between the highland barley paper and the inner wall of the shell is completely exposed. The exposed aluminum foil is tightly attached to the inner wall of the metal shell of the capacitor under the stress action of the insulating highland barley paper. The specific process comprises the following steps: 1. welding a core → 2, packaging core bag → 3, packaging highland barley paper → 4, installing metal shell → 5, sealing metal shell → 6, detecting the package.

The utility model discloses an add the one deck aluminium foil between original insulating highland barley paper and metal casing, lead to the radiating effect good. Through experiments, taking a dry capacitor of 0.45-30-3 as an example, after the internal bulk is added, the temperature rise is reduced by 6-8 ℃.

Claims

1. The built-in heat sink of a dry-type low-voltage parallel power capacitor, comprising a wire, a capacitor core, a lead-out terminal, a metal casing, an aluminum foil, and the core is connected with an external terminal by a welding wire, it is characterized in that: the capacitor core is wrapped outside The cable paper is used as insulation, and more than one circle of highland barley paper is added between the core package and the metal shell to strengthen the insulation effect between the core package and the shell. The insulating cable paper is wrapped, and then placed between the end faces of the two cores of the capacitor. The other end of the aluminum foil is drawn out between the metal shell and the insulating highland barley paper, and the aluminum foil between the highland barley paper and the inner wall of the shell is completely exposed.