JPS587563Y2 - Kichiyuukaihei Kinoshiyoukosouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to an arc extinguishing device for an air switch, and its purpose is an arc extinguishing device for an air switch that further promotes the arc extinguishing action of the normal slit arc extinguishing method. is to provide.

The present invention is a creation of a technical idea that reasonably achieves the above objectives.

First, the basic configuration of the arc extinguishing device for an air switch according to the present invention will be explained with reference to FIG. An arc extinguishing rod e is provided which cooperates with this to perform a slit arc extinguishing action, and a fixed electrode a is provided.
A sealed chamber A is formed on the proximal end side, and a pumping action is performed by the movement of the movable electrode d into and out of the fixed electrode a, and an intake hole f is formed in a part of the cover C and the fixed electrode a, respectively. is installed through the intake hole f, and the air flowing in from the intake hole f is blown by the pump action onto the arc generated when the circuit is opened.

Next, the first embodiment of the present invention as an actual air switch will be explained with reference to FIGS. It is a cylindrical insulator with a through hole 4 in the center consisting of a small diameter part 2 and a large diameter part 3.
is formed.

Reference numeral 5 denotes a conductive member having an inverted T-shaped longitudinal section inserted into the small diameter portion 2 of the through hole 4 from the large diameter portion 3 side, and having its upper end protrude toward the tip of the cylindrical insulator 1, and a sealing rubber 6 , is fixed with a nut 8 via a pressing metal fitting 7, and an upper terminal 9 is screwed together.

10 is a buffer member made of rubber interposed between the stepped portion 4a of the through hole 4 and the lower end flange portion 5a of the conductive member 5;
Reference numeral 11 indicates the outer circumferential portion of the flange portion 5a and the large diameter portion 3 of the through hole 4.
A urethane resin is filled between the inner circumferential surface 3a and the through hole 4 to seal it.

12 is a bolt 1 attached to the lower surface of the flange portion 5a of the conductive member 5.
The side surfaces fixed by 3 are hollow-shaped flexible conductive members, and although not shown in this embodiment, are attached to the lower surface of the flange portion 5a at three equal intervals in total.

14 is the bolt 13 inside one of the conductive members 12.
It is a fixing metal fitting having a U-shaped vertical cross section, and has a mounting hole 14a extending through the negative side thereof.

15 is a pin 1 that passes through the upper end into the mounting hole 14a.
At the same time, a male screw portion 15a formed on the lower half is screwed into the upper end of the arcing chamber cover 25 (described later) via the lower end of the conductive member 12 and the electrode fixing plate 19 (described later), and tightened with the nut 17. It is a fixed support rod, and a buffer coil spring 18 is installed between the fixing metal fitting 14 and the nut 17.
is interposed therebetween, and its elasticity urges the conductive member 12 downward.

Reference numeral 19 denotes a planar donut-shaped electrode fixing plate fixed to the lower end surface of the conductive member 12 by the male threaded portion 15a of the support rod 15, and has a female threaded portion 19a formed in its center. .

Reference numeral 20 denotes a cylindrical fixed electrode in which the male screw portion 20a at the upper end is screwed onto the female screw portion 19a of the electrode fixing plate 19, and an appropriate number of cuts are made in the lower end, and a base A suitable number of intake holes 21 (four in this embodiment as shown in FIG. 4) are provided at equal intervals on the circumferential side of the end portion.

22 is an arc-resistant metal attached to the lower end of the fixed electrode 20;
A garter spring 23 is similarly wound around the outer periphery of the flat end of the fixed electrode 20.

24 is a sealing ring made of an insulating material adhered to the outer peripheral edge of the electrode fixing plate 19, and its outer peripheral surface is connected to the through hole 4.
The chamber A consisting of the electrode fixing plate 19, the sealing ring 24, the large diameter part 3, and the flange part 5a is brought into contact with the inner peripheral surface 3a of the large diameter part 3, excluding the inner part of the fixed electrode 20. It is almost sealed.

When a movable electrode 33, which will be described later and which is sandwiched in contact with the inner side of the fixed electrode 20, moves downward, the pressure inside the chamber A is reduced and air is sucked through the intake hole 21.

Reference numeral 25 denotes a cylindrical arc extinguishing chamber cover fixed to the lower surface of the electrode fixing plate 19 by the male threaded portion 15a of the support rod 15, and an appropriate number of intake holes are provided in the upper end thereof in a direction perpendicular to the axis. 26 (in this embodiment, a total of two as shown in FIG. 4) are provided through the electrodes so that fresh air can be introduced from the atmospheric side to the fixed electrode 20 side.

Reference numeral 27 denotes a flat donut-shaped arcing horn fixed to the inner stepped portion 25a of the arc extinguishing chamber cover 25 by a flat donut-shaped fixing member 28 and bolts 29, and the arcing horn 27 and the electrode fixing plate 19 are connected to each other. A horn coil 30 is connected between them.

31 is an arc-proof metal attached to the inner edge of the arcing horn 27.

32 is a cylindrical arc extinguishing cylinder screwed onto the female threaded portion 28a inside the fixing member 28, and 34 is the arc extinguishing chamber cover 25.
It is a donut-shaped support member screwed onto the inner periphery of the lower end.

Reference numeral 33 denotes a movable electrode which is inserted into and removed from the fixed electrode 20 via an arc extinguishing cylinder 32, and an arc extinguishing frame 35 is fixed to its tip via an arc-proof metal 36.

Next, the functions and effects of the present invention will be explained.

Now, when the movable electrode 33 moves downward from the position shown by the solid line in FIG.
When trying to move away from the lower end of 0, the same arc-resistant metal 36
An arc is generated between the arc-proof metal 22 of the fixed electrode 20, but the pressure in the chamber A is reduced when the movable electrode 33 is moved down, and therefore the air intake hole 26 of the arc-extinguishing chamber cover 25 and the fixed Fresh air is introduced into the inside of the fixed electrode 20 (in the direction of arrow P1 in FIG. 5) through the intake hole 21 of the electrode 20, and this air is introduced into the arc through the gap t between the fixed electrode 20 and the movable electrode 33. Accelerates arc extinguishing action by blowing.

Next, the movable electrode 33 moves further down and the arc-proof metal 36
moves below the arc-resistant metal 31 of the arcing horn 27, an arc moves between the arc-resistant metal 36 and the arc-resistant metal 31 of the arcing horn 27, and this arc current flows to the horn coil and rotates the arc. A driving magnetic field is generated which further promotes the arc extinguishing effect.

At this time, since the pressure inside room A is reduced as mentioned above,
Fresh air from the atmosphere side flows through the intake hole 26 of the arc extinguishing chamber cover 25.
A part of it is blown onto the arc through the intake hole of the fixed electrode 20 and the gap t, thereby promoting arc extinguishing action.

Then, the remaining air passes through the gap T formed by the outer surface of the fixed electrode 20 and the inner surface of the arc extinguishing chamber cover 25 and passes through the gap P2.
It is guided in the direction of the arrow and blown in the arc shape, further promoting the arc extinguishing effect, but this is an incidental effect.

In this way, the present invention provides an arc extinguishing chamber on the fixed electrode side and an arc extinguishing frame on the movable electrode side that cooperates with the arc extinguishing frame to perform a slit arc extinguishing action. A chamber is formed on the side that communicates with the inside of the fixed electrode, and a pumping action is performed by the movement of the movable electrode into and out of the fixed electrode, and an intake hole is provided through which the outside air is sucked into the inside of the fixed electrode by the pumping action. However, by blowing the air flowing in from the intake hole by the pump action onto the arc generated when the circuit is opened, the arc extinguishing effect of the conventional slit arc extinguishing method is promoted and the arc extinguished more effectively. This is an excellent invention for industrial use as an arc extinguishing device for air switches.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the basic configuration of the arc device for an air switch of the present invention, Fig. 2 is a longitudinal cross-sectional view of a switch equipped with the arc device of the present invention, and Fig. 3 is a longitudinal cross-sectional view showing the same basic structure. Enlarged longitudinal cross-sectional view of section 4
The figure is an enlarged cross-sectional view showing the mounting position of the intake hole, and FIG. 5 is a partially omitted longitudinal cross-sectional view showing the operating state. Fixed electrode...20, Intake hole...21.
Sealing ring...24, Tree arc chamber cover...
・25, Air intake hole...26, Arc extinguisher tube...
32. Movable electrode...33. Arc extinguishing rod...
35, room...0

Claims (1)

[Scope of utility model registration request] In an air switch which has an arc extinguishing chamber on the fixed electrode side and an arc extinguishing rod that cooperates with the arc extinguishing rod to perform a slit arc extinguishing action on the movable electrode side, there is an arc extinguishing chamber on the fixed electrode side, and an arc extinguishing rod that cooperates with the arc extinguishing rod to perform a slit arc extinguishing action. A communicating sliding chamber is formed, and a pumping action is performed by inserting and removing the movable electrode with respect to the fixed electrode, and an intake hole is provided through which the outside air is sucked into the fixed electrode by the pumping action. An arc extinguishing device for an air switch in which air flowing in from the intake hole is blown onto the arc by the pump action.