CS255797B1 - High Voltage Fuse Cartridge - Google Patents

Abstract

A high-voltage fuse cartridge, in particular a power fuse cartridge of an outdoor design, in which improved sealing of the cavity, the insulating body, with an inserted fusible link is achieved. This improvement is achieved by a continuous circular recess formed at the point of transition of the contact rings to a smaller diameter, this point having the shape of a flat annulus. The said circular recess has the shape of a groove and rests on the sealing annulus. The sealing annulus is pressed against the faces of the insulating body by pressure, guaranteeing the required sealing of the cartridge, which is of a permanent nature.

Description

BACKGROUND OF THE INVENTION The present invention relates to a high voltage fuse cartridge, in particular to an outdoor fuse cartridge

The MV fuse cartridges provided with a contact fitting are generally in the form of a cylindrical disguise fixed to the insulating body of the cartridge. Due to the fact that a large number of fuses are operated in an environment with high relative humidity or directly in an open atmosphere, there are considerable problems with sealing the fittings required to prevent moisture from entering the cartridge. An embodiment of a fitting is known in which a rubber sealing ring is disposed in one or more grooves along the periphery of the insulating body for sealing. Another embodiment uses sealant © or encapsulating material to fill the space between the fitting and the insulating body.

The disadvantages of the described solutions are considerable laboriousness and difficult technology, and there are also leaks that allow moisture to enter the cartridge.

The above-mentioned disadvantages are eliminated by the fuse cartridge according to the invention, characterized in that both contact rings are rotationally symmetrically transformed into smaller diameters, whereby the lower contact ring passes into the status indicator housing and the upper contact ring passes into the cap and the upper contact sleeve. wherein both transition points are in the form of a flat annulus in which a continuous circular groove is formed to press the sealing annulus against the front walls of the insulating body.

The advantages of the fuse cartridge according to the invention lie in a substantially better sealing of the cavity of the insulating body in which the

255 797

- 2 conductor, eliminating one point of electrical transition between the contact rings and the fusible conductor terminals when compared to the conventional arrangement ·

An exemplary embodiment of the invention is shown in the accompanying drawing, showing a high voltage fuse cartridge in cross-section.

The fuse cartridge according to the invention consists of an insulating body 8 in the form of a hollow porcelain cylinder which is provided at both ends of a recess 11, 12 for pressing the lower contact ring 2 and the upper contact ring 3, the lower contact ring 2 which is rotationally symmetrically deformed to a smaller diameter. it passes into a status indicator housing 22, in the cavity of which a contact cap 5 is pressed onto which both the status indicator 23 and the lower contact sleeve 24 of the fuse link are mounted at the point of transition of the lower contact ring 2 to the housing 22; The shape of the flat annulus is a continuous circular groove 21, which presses the sealing ring 4 against the bottom face of the insulating body 1. The upper contact ring 3 is rotationally symmetrically deformed to a smaller diameter to form a ring for internally pressing the closure cap. 8 with the sealing insert 7 and at the same time for externally pressing the upper contact sleeve 6 of the fuse insert. At the point of transition of the upper contact ring 3 to the smaller diameter ring 32, which transition has the shape of a flat annulus, a continuous circular groove 31 is formed. 4, a fuse-link with a fusible conductor, the electrical outlets of which are provided by the upper contact sleeve, is placed on the upper front wall of the insulating body 6 'and the cavity of the insulating body 1. 6 and the lower contact sleeves 24 firmly electrically conductively connected to the lower contact ring 2 and the upper contact ring 3,

By the described arrangement, the desired improved sealing of the inner cavity of the insulating body 11, in which the fusible conductor surrounded by the granular extinguishing agent is located, is achieved. The sealing element is a sealing ring 4, which is pressed by continuous circular embossments onto the fronts of the insulating body 1 by a pressure that ensures the required sealing of the cavity permanently.

Claims (1)

High voltage fuse cartridge, in particular an outdoor fuse cartridge with a contact fitting consisting of contact rings, contact sleeves, lid and status indicator, characterized in that both contact rings (2, 3) are rotationally symmetrically transformed into smaller diameters, whereby the lower contact ring (2) becomes a housing (22) of the status indicator (23) and the upper cock ring (3) becomes a ring (32) for pressing on the closure cap (8) and the upper contact sleeve (6), wherein; the two transition points are in the form of a flat annulus in which a continuous circular groove-shaped recess (21, 31) is provided to press the sealing annulus (4) against the front wall of the insulating body (1),