JPS606992Y2 - Deformation prevention device for lower fixed electrode in high voltage cutout - Google Patents

Description

[Detailed explanation of the invention] This invention is a cylindrical high-voltage cutout that prevents the fuse tube from falling due to deformation of the lower electrode or causing overheating at the welded part with the electrode. be.

In a cylindrical high-voltage cutout as shown in Figure 1, a movable electrode 2 is installed at the bottom of the fuse tube 1, and a current collector plate 4 is attached to the dead bottom of the insulator 3 of the cutout body. Fix the lower fixed electrode 3 with the rivet 6, and then attach the fuse tube 1.
It is well known that the movable electrode 2 and the fixed electrode 5 are held together by pressure contact force.

The insertion and removal of the fuse tube 1 and the opening and closing of the lower fixed electrode 5 are not only repeated many times over a long period of time, but also may be performed violently, and when a large current is interrupted. Since the fixed electrodes 5, 5 are subjected to a large uneven pressure, the fixed electrodes 5, 5 are deformed to open as shown in the fourth figure, and as a result, the holding force of the fuse cylinder is reduced, causing overheating at the contact part with the fixed electrode 5, or the fuse There are defects such as the tube itself falling off.

The present invention prevents such defects using an extremely simple and inexpensive device.

The present invention will be explained with reference to embodiment drawings.

In this case, the current collector plate 4 is made into an occluded circle, and a fixed electrode 5 is placed on the lower surface of the current collector plate 4.
5 and deformation prevention plates 7, 7 for preventing deformation of the fixed electrode are overlapped and fixed with the rivet 6, and the tip edges 8, 8 of each prevention plate 7 are both on the same circumference. A certain gap a is then created between the opposing fixed electrodes 5.

This constant gap a is configured to stay within the elastic limit of the fixed electrode 5.

When configured as in the above proposal, the fuse tubes 1
The lower fixed electrode 5 always maintains its elasticity even if it is inserted and removed, even if rough opening/closing operations are performed during insertion and removal, and even if a large bias pressure is applied when a large current is cut off. Since it is blocked by the blocking plate 7 within the limit, the fixed electrode 5
There is no decrease in the elastic force of the material.

Therefore, since the fuse tube 1 is always held securely, there are no defects such as the fuse tube falling or overheating of the contact portion as in the conventional case.

The present invention is even more effective because it achieves the above effects with an extremely simple and inexpensive structure.

[Brief explanation of drawings]

Attached Figure 1 is a partially cutaway side view of a cylindrical high-voltage cutout to which the present invention is to be implemented, and Figure 2 is a side view of a deformation prevention device for the lower fixed electrode in the high-voltage cutout to which the present invention is implemented. FIG. 3 shows a cross-sectional view along line x-x. FIG. 4 shows a side view of a conventional fuse cylinder holder. 1... Fuse tube, 2... Lower movable electrode, 4... Current collector plate, 5... Lower fixed electrode, 7... Deformation prevention plate, tail: tip edge of the prevention plate, a: gap between the fixed electrode and the prevention plate.

Claims (1)

[Scope of utility model registration request] A cut-out current collector plate 4 is provided on the lower hole wall of the high voltage cut-out insulator 3, and the outer end of the lower fixed electrode 5 for holding the fuse cylinder and the deformation prevention plate 7 of the fixed electrode are connected to the current collector plate 4. The distal edges 8, 8 of the blocking plate 7 are arranged on the same circumference and are formed into a high-voltage cut-out with a gap a within the elastic limit of the fixed electrode 5 between the fixed electrode 5 and the fixed electrode 5. A deformation prevention device for the lower fixed electrode.