JPS6149345A - Switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a switch, and more specifically, at least one pair of contacts, together with an arc extinguishing plate that cools an arc, is a switch. The present invention relates to a switch which is housed in an enclosure and has an arc runner attached to a fixed contact.

[Conventional technology]

1 and 2 show a conventional switch of this kind, in which a fixed contact 3 and a movable contact 3 are respectively attached to fixed electrodes and movable electrodes arranged opposite each other, and l pairs of contacts are shown in FIGS. constitutes a child. An arc-extinguishing plate 6 to which the base end of the movable electrode unit is connected is disposed in the operation mechanism section 5.

The enclosure 7 is an integral body and houses the operating parts of the switch.

The enclosure 7 is provided with an arc or hot gas outlet t. An arc runner is attached to the fixed electrode l.

With the above configuration, when the movable contact G is now in contact with the fixed contact 3, power is supplied from the power source to the load side via the fixed electrode 1 → fixed contact 3 → movable contact G → movable electrode 2. Ru. When this state ends and a large current such as a short-circuit current flows between the contacts, the operating mechanism section 5 operates to separate the movable contact from the fixed contact J. At this time, an arc is generated between the fixed contact 3 and the movable contact, and an arc' voltage is generated between the fixed contact 3 and the movable contact. It increases as the distance increases. Also, at the same time, the arc people are arc extinguishing board 6
The arc voltage increases further as it is drawn to the side by the magnetic force and expands.

Then, the arc current reaches its zero point, the arc A is extinguished, and the current is interrupted.

Considering the above operation in more detail, the movable electrode unit is
As shown in FIG. 3, the poles are opened by rotating. In this electrode opening operation, the spatial distance between the movable electrode 2 and the fixed electrode l is the same as that between the abdomen 2a of the movable electrode 2 and the tip of the fixed electrode
The distance between i is short. On the other hand, the arc generated between the movable contact Hiroshi and the fixed contact J receives an electromagnetic force from the current flowing through the fixed N and pole L and the current flowing through the movable electrode 2, and receives a force in the direction of the resultant force. However, this electromagnetic force is relatively small because the electrode structure is one in which current flows linearly when the movable contact is closed. It moves from the position between ≠ and the fixed contact 3 to a position a short distance between the abdominal part a of the movable electrode 2 and the tip part /a of the fixed electrode l, and stays there.

Therefore, in the figure, contact 3. There was a problem in that the arc A did not come into contact with the arc extinguishing plate O located on the right side of the arc, and the arc A was not cooled, making it impossible to obtain the desired interrupting performance.

In addition, even if the distance between the abdominal part a and the tip part a is not particularly short as described above, there are many structures in which the distance between the fixed contact 3 and the movable contact part is short, and in this case, Arc is contact point 3. Stopped at Hiroma. In this way, even though the arc was cooled by the arc-extinguishing plate B, the stagnation of the arc on the contacts accelerated contact wear, creating a serious problem in upgrading the breaking capacity of the switch.

In order to solve the above problems, the present inventors proposed a fixed contact as shown in FIG. That is, the arc runner t9, which has a horizontal U-shape and has a notch groove /9c formed in the center thereof, is fixed to the fixed electrode /l, and the fixed contact 13 attached to the fixed electrode // is inserted into the notch groove /l. This is what will happen at 9c.

The dynamics of such a structure will be explained with reference to FIGS. 5 to 7. FIG.
The tip end part 2a of the movable electrode /U, to which the movable electrode /U is attached, extends beyond the position of the movable contact Lda to form an arc horn, and a part of the tip part A is connected to the cutoff of the arc runner /Q. It faces the notch/9c. Figure 6 shows the initial state of contact opening in the current interrupting operation. When the pole advances and the distance between the part of the arc runner t9 and the tip /2a of the movable electrode 12 is shorter than the distance between the contacts t3 and /4' by <7 degrees, as shown in FIG. , arc A immediately contacts /J.

It transfers from between ltI to between arc runner 19 and tip end/2a. At this point, the tip part tyua acts as an arc horn, and the distance between the movable contact point 4' becomes a dog due to the transition, so that wear and tear on the movable contact point 4' is significantly reduced. Further, since the arc A is strongly pressed against the arc extinguishing plate on the right side of the contact and is cooled, the current interrupting performance is also improved.

[Summary of the invention]

The purpose of this invention is to further improve the above-mentioned configuration, and to extremely accelerate the transition of the arc to minimize wear and tear on the contacts. A switch is provided in which opposing transition surfaces are formed in notched grooves of an arc runner.

[Examples of disasters caused by inventions]

Figures 1 to 1 show an embodiment of the present invention, and in Figures g to io, a fixed contact 13 is attached to a fixed electrode attached to an arc runner. has a horizontal U-shape, with a notch B/? in the center. C is formed. Furthermore, the bottom front line of the notch/notch groove/9c is the fixed electrode/
It is cut and raised towards the side of /, forming an arc transition surface YuO to which the legs of the arc transfer. This arc transition surface 2o
As shown in FIG. 1, when the electrode is closed, the movable electrode 7.
Take a position opposite to the tip a of No. 2. Other hydrocyanic acids are the same as conventional ones.

The operation will be briefly explained. When the movable electrode /2 widens and starts the opening movement ('F-e), an arc is generated between the fixed contact 13 and the movable contact Lda, and this arc is Electrical high-temperature gas is released. When this high-temperature gas fills between the tip of the movable electrode 1-2a and the arc transition surface 20 provided on the arc runner 7, disconnection fracture occurs at this location. As shown in FIG. 12, the arc person is dislocated between the tip part /2a and the arc transition surface 20.In this current number, the transition area is increased by providing the arc transition surface UO. Therefore, random failure will occur easily with probability, and the timing at which arc transition will occur will be earlier. Therefore, the time during which the arc is stuck between contacts /, 3, /! will be shortened, and the wear of the contacts will be reduced. or significantly reduced.

Figures 73 and 74 show other embodiments 1, rainbow
Arc runner/? Cut and raise the bottom front rib of the notch groove/9Q on the opposite side of the fixed electrode// to connect the arc transition surface 2 (7
It is formed by forming a.

Even in such a structure, the tip part /2a of the movable electrode 12
Since the surface shape of the arc transition surface 20a facing the arc transition surface 20a is rough, early transition of the arc is achieved, and a similar effect can be obtained.

Note that the contactors are not limited to / pairs, and the same applies to multiple pairs of contacts.

〔Effect of the invention〕

This invention has a simple structure in which an arc transition surface is provided at the bottom of the notch groove of the arc runner, which faces the tip of the movable electrode when the electrode is closed. Consumption can be minimized.

[Brief explanation of the drawing]

Figures 1 to 7 show conventional switches, Figure 1 is a partially sectional plan view, Figure 2 is a sectional view taken along line nn in Figure 1, and Figure 3 shows the operation. FIG. 7 is a partial perspective view, and FIGS. 5 to 7 are side views of essential parts showing operating states. Figures 3 to 12 show an embodiment of the present invention, in which Figure 1 is a partial side view, Figure 9 is a partial plan view, Figure 10 is a partial perspective view, and Figure 11 is a main part. Side view, Figure 1 is a side view of main parts showing the operating state. FIG. 73 and the M/Hiro diagram show other embodiments, with FIG. 73 being a partial perspective view and FIG. 141 being a side view of the main part. 7.Envelope, //.Fixed electrode, lyu..Movable electrode,
13... Fixed contact, /l... Movable contact, /9... Arc runner, /9C... Notch groove, 20.20a... Arc transition surface. In each figure, the same reference numerals indicate the same or similar parts. ]○Figure 1q

Claims (2)

[Claims] (1) A contactor consisting of a fixed electrode and a rotatable movable electrode,
an arc extinguishing plate, an arc runner attached to the fixed electrode and having a notch groove formed in the center thereof, and an arc formed at the front bottom of the notch groove and facing the tip of the movable electrode when the electrode is closed. A switch comprising a transition surface. (2) The switch according to claim 1, comprising an arc transition surface formed by cutting and raising the front edge of the bottom of the notch groove.