JPS5873933A - Circuit breaker - 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 This invention separates the fixed and movable contacts by electromagnetic repulsion when a short-circuit current flows in the circuit, and then connects the fixed and movable contacts to an arc absorber equipped with a de-ion arc extinguishing device. This invention relates to an improvement in a circuit breaker that quickly interrupts short circuit current by bringing the arc energy close to aliL.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

In Fig. 1, 1 is a molded case, 2 is a fixed contact conductive plate that can be folded into a substantially U-shape, and one end has a fixed contact, but the image is blocked, and the other end is an insulating case, which will be described later. 8, is rotatably attached to a nine-pivot shaft 26, and is biased by a contact pressure spring 27 in the direction of the movable contact conductor 1j4, which will be described later. Reference numeral 28 denotes a piece made of copper embroidery, which connects the fixed contact conductive plate 6 and the terminal plate 29 fixed to the molded case IK. Reference numeral 4 denotes a movable contact conductive plate which is bent into a substantially U-shape and has a parallel portion facing the fixed contact conductive plate 2, the bottom portion 4a of which is a rectangular protruding portion 5a of a connecting conductor 5, which will be described later. It is pivoted so that it can rotate freely using the fulcrum. Reference numeral 6 denotes a movable contactor which is fixed to the tip Wc of the movable contactor conductive plate 4, and is disposed opposite to the fixed contact To. 7 is the insulation case VCii, which will be described later.
It is an arc absorber having a large heat capacity and having a substantially rectangular shape, which is rotatably attached to a pivot shaft 9 mounted on the holder.
5 and an O recess 1Ω for elastic body impact, 11 are provided.
hru.

The deiono arc extinguishing device '25 is a delicate magnetic plate 2 having V-shaped notches attached to the arc absorber 7 at predetermined intervals.
It has a function of shredding and dividing the arc generated in p1 fixed and movable contact wire and p4 when it is cut off.

10 is a separation spring (elastic body of $1) that is landed between -s1a of the molded case 1 and the recess 7a of the arc absorber 7
The arc absorber 7 is urged in the counterclockwise direction as shown by arrow A. 11 is the concave portion 7b of the arc absorber 7
A compression coil spring (second elastic body) is elastically landed between the movable contact conductive plate 44D and the movable contact conductive plate 44D! It acts on iI & l 14M and the rectangular protrusion 5a of the connecting conductor 5, which will be described later, and on the other hand, in the bending direction (0
Four forces are acting on the movable *toucher 6 and the fixed contactor 3. Therefore, the current flows from the fixed contact conductive plate 2 to the fixed contact 6 to the movable contact 6 to the movable contact conductive plate 4 to the *a conductor 50. The above-mentioned 5 is a connection conductor fixed to an insulating case 8, which will be described later, and its two ends are connected to the wedge-shaped protrusion 5 as described in 1.
a, and the movable contact conductive plate 40 connection point, and 1'
, :...: and the other end is connected to a tripping element (not shown) of an automatic tripping device. 8 is an insulating case that houses the arc absorber 7, the compression coil spring 11, the movable contact conductive plate 4, the fixed contact conductive plate 2, the connecting conductor 5, the fixed contact 6 and the movable contact 6, Fixed and movable contacts 3 and 6
This prevents the arc gas generated in the cabinet from being discharged to the opening/closing mechanism and self-triggering device (not shown). Reference numeral 12 is provided on a fixed frame (not shown), and is freely rotatable on a fixed axis.
It is located in the state of 1iiuc. 14 is this manual
The bar 121 is rotatably supported by the pin 15 at the tip of the bar 121, and the free end of the link A 14 is connected to the upper end of the rear link 814 and the back surface of the bar 17. It is provided. Reference numeral 17 is rotatably attached to a pivot 19 provided on a fixed frame (not shown) K, and engages with a tripping lay <-20, which will be described later, to restrict its circumferential movement. has been done. 20 is a pivot 2 provided on a fixed frame (not shown)
If a short-circuit current flows into the circuit, the automatic 4-release element (i
Detection of the time (not shown) is recommended, as is the direction of the hour hand. 16 line above leno <-
100 is installed between the back side and -glb of the mold case 1 so as to be slidable in the vertical direction. / comes into contact with C22, and the above link ^14
42) Let the displacement be f! Intercept/receive C22Vc@**
22 is a link C'e rotatably connected to a pivot shaft 26 provided on a fixed frame (not shown), and is connected between a part 1C of the mold case 1 and the recess 122a. The elastic force of the link spring 240 made of nine compression coil springs presses the link/816 upward, and the tip l5
22b comes into contact with the arc absorber 7 and controls the rotation of the arc absorber 7 in the counterclockwise direction. Link like this □
^14. 'The link 816, the link C22, the trip lever 21, and the lever 17 constitute an opening/closing mechanism.
□Next, I will explain this printing operation.

□As shown in Fig. 1, when the manual handle 12 is in the ON state and a short circuit current flows into one circuit, it first acts on the parallel parts of the fixed contact conductive plate 2 and the movable contact conductive plate 4 and the OW4. Due to the repulsive force of the electric nose, the fixed contact conductive plate 2 rotates in the direction of the hour hand as shown by the arrow against the biasing force of the contact pressure spring 27, moves to the dashed line 0 position, and the fixed contact 6 is separated from the movable contact 6. In parallel with this operation, if the manual handle 12 is in the ON state and a short circuit current flows into the circuit, the automatic 1 release element (not shown) detects this and moves the release lever 20 as shown by the arrow. When the lever 17 is rotated in the direction of the hour hand and the engagement between the lever 17 and the lever 20 is released, the lever 17 is rotated in the direction of the hour hand as shown by the arrow by the pressure of the roller 18.

As a result, row 218 is connected to link 81 as shown in FIG.
along the inclined surface 168 of 6, rotate in the direction of the lever 17,
It falls into the line X' between the back surface of the lever 17 and the link 816, and releases the upper end of the link 816 from being suppressed.

190.9y, #B16°-02°, 1 Even though the link C22 is not restricted, the link C22 rotates in the counter-hour direction of the arrow 2 so as to slide the link 814 upward by the elastic force of the ν'-link spring 240.

At the same time, the tip 22a of the link C22 moves the contact position of the arc absorber 70 and releases the rotation of the arc absorber 70, so that the arc absorber 7 is separated by the elastic force of 100 as shown by arrow A. It rotates counterclockwise around the pivot 9 as shown in FIG. As the arc absorber 70 rotates, the force of the compression coil spring 11 in the bending direction causes the movable contact conductive plate 4 to rotate in the clockwise direction of arrow H around the rectangular protrusion 5a of the connecting conductor 5. do. As a result, the movable contactor 6 fixed to the tip of the movable contact conductive plate 4 is fixed to the fixed contactor 6.
The contact elements 6 and 6 are further separated from each other, and an arc is generated between the two contacts 6 and 6.

However, due to the rotation of the arc absorber 7, the de-ion arc extinguishing device 25 approaches the fixed and movable contacts 6 and 6 as shown in Figure J12, and the generated arc is transferred to the magnetic plate 10-
Move it to the V-shaped notch, extend the arc,
Further, the arc is cut into pieces by the magnetic plate 108, and further divided into short pieces in the gap between the magnetic plates 10a. Moreover, the heat capacity is large.
When the arc generated in the arc absorber 7 comes into contact with the arc absorber 7, the arc voltage necessary to maintain the arc increases), and the power source voltage becomes unable to maintain the arc, so the arc is extinguished.

Since the generated arc gas is discharged from Y and Z between the upper and lower ends of the arc body 7 and the insulating case 8, the discharge of arc gas to the outside of the mold case 1 is small. becomes possible.

Next, in the trip state shown in FIG.
When rotated in the direction of the hour hand, the row 218 slides upward through the threshold distance X between the back of the lever 17g and the link 816, contrary to the above-mentioned operation, and the manual handle 12 is in the OFF state 1.
When you reach the liI position, low 218, tripping V par 2
0 and lever 17 are in a locked state.

As described above, according to the present invention, the fixed and movable contacts are separated from each other by the repulsive force of the electric wire, and the fixed and movable contacts are connected to one arc absorber having a de-ion arc extinguishing device for collecting arc energy. Because they are placed close to each other, when the arc absorber is rotated during an interruption, a de-ion arc extinguishing device is generated, which shreds and splits the other arc, and when the arc comes into contact with the arc absorber, the arc resistance increases and short-circuit current is generated. can be quickly interrupted.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal cross-sectional view of a one-way f-breaker according to an embodiment of the present invention in an ON state, and FIG. 142 is a partial longitudinal cross-sectional front view of the same in a trip state. 1...Mold case, 2...Fixed contact conductive plate,
6... Fixed contact, 5... Connection conductor, 6... Movable contact, 7... Arc absorber, 9... Pivot, 10...
... Elastic body of stripe 1 (M spring), 11... 20th elastic body (compression coil spring), 12-... Manual handle, 14
- Link ^, 16... Link B, 22- Link C125... Deion arc extinguishing device, 26-... Axis for converting fixed contact conductive plate. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] It has a trip-free mechanism that does not prevent the manual handle from disengaging even when the manual handle is locked in the ON position;
The opening/closing mechanism operates the link C for restricting the rotation of the arc absorber at the time of interruption by excitation and excitation, and the opening/closing mechanism is pivotally attached to the pivot and is rotated by the rotational bias of the first elastic body. A de-ion arc extinguishing device made of a magnetic plate having an arc absorber that contacts and interlocks with the arc absorber, and a V-shaped notch attached to the arc absorber; and a de-ion arc extinguishing device O for the arc 1kIiL body. A movable contact is disposed close to the circuit III, and the connecting conductor is elastically connected to a movable contact conductive plate which is freely supported around a fulcrum IIc, and a threshold between this movable contact conductive plate and the arc absorber. The jI20 elastic body that is attached and makes the contact conductive plate nra, and the above-mentioned material. 116! ! A fixed contact is provided opposite to the contactor and disposed close to the rotation path of the de-ion arc extinguishing device of the arc absorber, and is rotatably supported at a position opposite to the movable contact conductive plate. The fixed contact and the movable contact are separated by the electromagnetic repulsion force generated when an interruption accident occurs, and then the arc absorber equipped with the de-ion arc extinguishing device is fixed in the armpit. and a circuit breaker characterized in that movable contacts are placed close to each other.