JPS5934022Y2 - Switch electrode structure - Google Patents

Description

[Detailed description of the invention] This invention relates to the electrode structure of a switch, which increases the load switching ability of the switch, and prevents damage to the contacts due to arcing even when short-circuit current is applied, thereby preventing any hindrance to performance. The purpose is to eliminate the disadvantages of

That is, in the present invention, the rotary movable contact blade has a Z-shaped one-point cut structure, and the electrode structure is such that one side of the movable contact blade is slightly longer than the other so that there is a time difference when opening and closing. This is what we provide.

Hereinafter, the present invention will be explained in detail based on the drawings of the embodiments.

Support insulators 1 and 2 fixed to a case (not shown), etc.
Fixed contacts 3 and 4 as fixed electrodes and arc extinguishing chambers 5 and 6 are provided in opposing positions at the inner ends of the fixed contacts 3 and 4, respectively, and movable contacts corresponding to the fixed contacts 3 and 4 so as to be able to approach and separate, respectively. The blades 7 and 8 are protruded and fixed in a Z-shape around the rotating body 9.

Note that the movable contact blades 7 and 8 may be integrally formed in a Z shape, or the movable contact blades 7 and 8 may be separate bodies and connected and fixed by the rotating body 9.

The movable contact blade 7 is longer in shape than the other movable contact blade 8, and each tip has an arc-resistant metal portion 7b.

8b is formed.

In addition, the end face of the longer movable contact blade 7 is shaped obliquely so that the outer side has a protruding shape, and by swinging the arc outward when opening, the angular velocity is increased and the breaking performance is increased. It has become.

The fixed contact, the arc extinguishing chamber, and the movable contact blade connect the same three phases, and 10 is a rotating insulator that isolates different phases.

Next, to discuss the operation and effect, Fig. 1 shows a state just before closing, and the movable contact blades 7 and 8 are made different in length and short, and a time difference is made in the contact and separation operations with the fixed contacts 3 and 4. Therefore, when the tip arc-resistant metal part 7b of the movable contact blade 7 comes into contact with the fixed contact 3, the other movable contact blade 8 and the fixed contact 4 are on the verge of contact. No arc occurs on the contact blade 7 side.

Therefore, the injection arc is generated intensively on the movable contact blade 8 side.

In this case, the opposing surfaces of the contact blade and the contactor are configured to be parallel to each other so that an arc is generated over the entire surface to prevent local damage.

FIG. 2 shows a two-point break state when the contact is opened, and contrary to the case when the contact is closed, the part between the short movable contact blade 8 and the fixed contact 4 is first opened, and an arc A is generated.

Subsequently, while this arc A continues, the space between the tip protrusion of the longer movable contact blade 7 and the fixed contact 3 is opened, and an arc B is generated during this time as well.

As a result, a series two-point cut structure is created, and the insulation action is divided.

As explained above, this invention divides the interruption by cutting the arc at two points in series with a time difference, which reduces the arc load on each electrode, and also cuts the arc at one electrode (short) when closing. Since the load is placed on the movable contact blade side), even if it were to be turned on in the event of a short-circuit accident, damage to the electrodes due to the preceding arc can be kept to less than half of the total number of electrodes (six locations in the case of three-phase). This has the great effect of minimizing the influence on the opening operation due to welding of the movable contact blade due to damage to the electrode.

In particular, a long movable contact blade has a larger contact area at the time of insertion than a short movable contact blade, so reducing the arc load on the long movable contact blade as described above will prevent damage to the contact part. This greatly helps to prevent the associated malfunction of opening the switch.

In addition, since the opposing surfaces of the electrodes are parallel when they are turned on, damage to the electrodes can be prevented even when short-circuit current is applied, and switching performance can be improved without having to use a special structure or increasing the size. This invention has the great effect of improving the performance and is a device that can be widely used in industry.

In this case, the arc-resistant metal may be provided only on the movable contact blade 8 side.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being an explanatory view of the main parts showing a state just before being turned on, and FIG. 2 being an explanatory view of the main parts showing a state immediately after opening. 7.8...Movable contact blade

Claims (4)

[Scope of utility model registration request] (1) A Z-shaped movable contact blade that connects and separates from a pair of fixed electrodes is fixed to a rotating body disposed between the fixed electrodes, and one of the movable contact blades is slightly longer than the other. It takes shape,
The contact blades have different lengths, so that when the contact blade is inserted, the longer contact blade contacts the fixed electrode before the shorter contact blade, and when released, it follows the shorter contact blade and opens. The electrode structure of the switch is characterized by: (2) The electrode structure of the switch according to claim 1, which is a registered utility model, in which the bottom of the tank is such that the facing surfaces of the short contact blade and the fixed electrode are parallel to each other when the short contact blade is turned on. (3) When opened, the long contact blade opens while the arc continues between the short contact blade and the fixed electrode, resulting in a two-point cut. The electrode structure of the switch according to item 1 or 2. (4) The tip surface of the long contact blade is obliquely shaped so that the outer side is convex.
Electrode structure of the switch described in any one of the paragraphs.