JPS5819787Y2 - Switch arc extinguisher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc-extinguishing cylinder for a switch, and to a structure for simply and reliably supporting the arc-extinguishing cylinder.

Tulip-shaped contacts have been used for a long time in switches, especially circuit breakers.

However, since the tulip-shaped contact part itself does not have a breaking capacity, an arc extinguishing chamber is often used in combination.

When a large breaking capacity is not required, a simple cylindrical arc extinguishing tube is used instead of the arc extinguishing chamber.

FIG. 1 shows a conventional example of a support structure for a cylindrical arc-extinguishing cylinder that is used in a switch having a cylindrical arc-extinguishing cylinder.

In FIG. 1, designation number 1 is an arc extinguishing cylinder, which has a cylindrical shape.

This arc extinguishing tube 1 includes an electric arc contact 3, a support tube 4 and an insulating tube 5.
It is held in the insulator 2 on the fixed contact part side by.

That is, an arc extinguishing tube is provided in the part formed by the electric arc contact 3 screwed into the insulator 2 and the support tube 4 which is also inserted and fixed into the insulator 2 above the electric arc contact 3. 1 is inserted with their thick parts aligned, and then the insulating tube 5 is inserted into the insulator 2 so as to cover the arc extinguishing tube 1.

This insulating cylinder 5 has a male thread carved on the outer periphery of the lower part.
By screwing the insulating tube 5 into a female thread formed on the inner periphery of the upper part of the support tube 4, the arc extinguishing tube 1 is connected to the insulator 2.
It will be held firmly inside.

Here, the reference numeral 6 in the figure is a blank m, which is planted in the center of the insulator 2.

Reference numeral 7 denotes a tubular movable electrode, which is inserted into a cylindrical gap between the outside of the arc extinguishing rod 6 and the inside of the arc extinguishing cylinder 1, and a fixed contact 8.
can be contacted.

This conventional example has the following problems.

In other words, in order to support the arc extinguishing tube 1 within the insulator 2, a supporting tube 4 and an insulating tube 5 that are screwed together are separately required, which increases the number of parts and requires a lot of processing and assembly. It's time consuming.

Furthermore, since the support tube 4 and the insulating tube 5 are threaded, there is a risk that the mechanical strength will be reduced due to the threads being threaded.

Furthermore, there is also the concern that the screws may become loose due to the button being attached.

In view of the above-mentioned problems of the prior art, the present invention aims to provide an arc extinguishing cylinder for a switch whose structure is simple and requires a small number of parts, and whose support is reliable. This was devised based on a novel idea, and its configuration is such that the switch has an arc-extinguishing cylinder at the entrance of the fixed contact part, and one recess is formed in the outer peripheral wall of the arc-extinguishing cylinder. The other recess is provided at a position opposite to the recess of the arc extinguisher in the stored state of the arc extinguisher on the inner circumferential wall of the insulator that surrounds and supports the arc extinguisher; a body part inserted into one of the recesses, and a leaf spring-like bent body part that is pulled out from the main body part and bent, and has a leg formed at its tip that is inserted into the other recess part. It is characterized by inserting an elastic stopper consisting of a part.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 5.

Referring to the buttons in FIG. 2, reference number 11 is an arc extinguishing cylinder having a cylindrical shape, and reference number 19 is an elastic stopper.

Further, 12 is an insulator on the fixed contact part side, 13 is an electric arc contact,
16 is an arc extinguishing rod installed in the insulator 12, 17 is a tubular movable electrode, and 18 is a fixed contact. The outer periphery of the movable electrode 17 passes through the inside of the arc extinguisher 11 and connects to the arc contact 13 and the fixed contact 18.
come into contact with.

As shown in FIG. 3, the elastic stopper 19 is shaped like a leaf spring and has legs 19a formed at its bent portions.

On the other hand, as shown in the figure, one recess 11a is bored in the outer circumferential wall of the arc extinguishing tube 11 in which the stopper 19 can be accommodated.

The number of these one four parts 11a is not particularly limited, and if attention is paid to reliability of support, two or more may be provided.

Therefore, in this embodiment, as shown in FIG.
is provided with four recesses 11a, and a stopper 19 is fitted into each recess 11a.

At this time, the leg 19a of the stopper 19 elastically protrudes from the recess 11a.

On the other hand, the insulator 12 has the stopper 1 on its inner peripheral wall.
Another recess 12a is drilled into which 90 feet 19a can be inserted.

The number of other recesses 12a is also particularly limited, but since the other recess 12a is provided at a position facing the one recess 11a, there are two or more pairs of recesses 11a and 12a.

Next, the assembly of the arc extinguishing cylinder 11 will be explained.

For this assembly, it is convenient to use a cylindrical attachment/detachment tool 20, as shown in FIG.

That is, the stopper 19 is inserted into each recess 11a of the arc extinguishing tube 11, and the attachment/detachment tool 20 is placed over the arc extinguishing tube 11 including the stoppers 190 feet 19a.

In this way, with the stopper 190 foot 19a pushed in and the stopper 19 stored, the arc extinguisher cylinder 11 together with the attachment/detachment tool 20 is
is inserted into the insulator 12.

Thereafter, when the position of the foot 19a of the stopper 190 faces the recess 12a of the insulator 12, only the attachment/detachment tool 20 is extracted to the outside of the insulator 12.

Therefore, when the main body of the stopper 19 is inserted into one recess 11a of the arc extinguishing tube 11, the stopper 190 leg 19a elastically protrudes and is inserted into the other recess 11a of the insulator 12.
The arc-extinguishing tube 11 is reliably held in the center of the insulator 12 without loosening by the stopper 19 that enters the insulator 11a and engages across both the recesses 11a and 12a (see FIG. 2).

To remove the insulator 12 from the arc extinguishing tube 11 for cleaning and inspection, it can be done by using the attachment/detachment tool 20 in the reverse order of the assembly.

In this embodiment, the force of the stopper 19 is a leaf spring.The force is not limited to this, as long as it has elasticity and can be inserted across both the recesses 11a and 12a.

As described above in detail with the embodiments, according to the present invention, the structure is simple and the number of parts is small due to the use of the a stopper, and the attachment and detachment are easy.

(b) Since the arc extinguishing cylinder is held from the periphery by an elastic stopper, its insertion position is always at the center of the insulator on the fixed contact part side.

Since the C stopper has elasticity, it holds the arc extinguisher more stably without loosening compared to conventional screw-in support.

d Since the arc-extinguishing cylinder is loosely fitted along the outer peripheral wall of the movable electrode, the insertion operation of the movable electrode is circular and no unreasonable force is applied to the arc-extinguishing cylinder.

There are many advantages such as

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional arc extinguisher support structure, FIG. 2 is a sectional view showing an embodiment of the present invention, FIG. 3 is a perspective view showing the arc extinguisher and a stopper, and FIG. Figure 4 is A-A in Figure 3 showing the state in which the stopper is inserted into one of the recesses of the arc extinguisher.
A sectional view taken in the direction of arrows, and FIG. 5 is a sectional view showing how the arc extinguishing tube is attached and detached using an attachment/detachment tool. In the drawing, 11 is an arc-extinguishing tube, 11a is one recess, 12 is an insulator, 12a is the other recess, 13 is a mold plate contact, 16 is an arc-extinguishing rod, 17 is a plastic electrode, 18 is a fixed contact, 19 is a stopper, 19a is a leg of the stopper, and 20 is an attachment/detachment tool.

Claims (1)

[Scope of utility model registration request] In a switch having an arc extinguishing tube at the entrance of the fixed contact part, one recess is provided in the outer peripheral wall of the arc extinguishing tube, and an arc extinguishing tube is provided in the inner peripheral wall of the insulator that surrounds and supports the arc extinguishing tube. The other recess is provided at a position opposite to the recess of the arc extinguishing cylinder when the cylinder is stored, and the main body is inserted into the four parts of the one and this main body extends between the one recess and the other recess. A switch characterized in that an elastic stopper is inserted therein, comprising a leaf spring-like bent part that is pulled out from the body and bent, and has a leg formed at the tip to be inserted into the recessed part. arc extinguisher.