CN1270341C

CN1270341C - Multipolar circuit breaker

Info

Publication number: CN1270341C
Application number: CN 200310104633
Authority: CN
Inventors: 德永义博; 玄羽康司
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-07-17
Filing date: 2003-10-27
Publication date: 2006-08-16
Anticipated expiration: 2023-10-27
Also published as: CN1577688A; JP4024726B2; JP2005038769A; FR2857779B1; FR2857779A1

Abstract

Provided is a multi-electrode circuit breaker that prevents the drop of contact pressure between a fixed contact and a movable contact due to an electromagnetic rebounding force generated when a large electric current such as a short-circuit current is conducted, and the drop of a rated short time current of a contactor mechanism. An electromagnetic rebound force generated at least at one needle 6 out of electromagnetic rebound forces generated at the needles 6 of a plurality of contactor mechanisms 1a, 1b and 1c, when an electric current flows through the respective contactor mechanisms 1a, 1b and 1c, is made to act in the opposite direction to the rotating direction of a pivot 18, thereby making the pivot 18 difficult to rotate in the direction to open the contactor mechanisms 1a, 1b and 1c.

Description

Multi-pole circuit breaker

Technical field

The present invention relates to have the multi-pole circuit breaker of movable body by the moving contact of the conductor that fixed contact is set and setting and fixed contact deciliter forms a plurality of contact mechanisms part.

Background technology

Multi-pole circuit breaker utilization in the past is by the conductor that fixed contact is set and be arranged at a plurality of contact mechanical parts that the movable body of the moving contact of fixed contact deciliter forms, one end many eradications edge connecting rod that the other end links to each other with a plurality of direction shifter levers and also can rotate freely with the movable body of each contact mechanism part, and the pivot formation that is connected and can rotates freely maintenance with all directions shifter lever, at big electric current such as short circuit current from conductor flow during to movable body, between conductor and movable body, produce electromagnetic repulsive force, this electromagnetic repulsive force is by insulated connecting rod and direction shifter lever, to pivot action revolving force, utilize the effect of well-known switching mechanism part then, pivot rotation, a plurality of contact mechanism partly is in open mode (for example with reference to patent documentation 1).

The special fair 4-67292 communique (the 1st figure) of [patent documentation 1] Japan Patent.

Multi-pole circuit breaker in the past constitutes as mentioned above, from separately conductor flow during to separately movable body, produces electromagnetic repulsive force at big electric current such as short circuit current between separately conductor and movable body separately.Its result, because the instantaneous insulated connecting rod that passes through separately of electromagnetic repulsive force reaches direction shifter lever separately, to pivot action revolving force, therefore the problem that exists is, at this moment fixed contact and the contact pressure between the moving contact reduce, and the specified short-time current of contact mechanism part (JIS.C.83722 of Japanese Industrial Standards item (2) (g) described in) descends.

In addition, the JIS.C.83722 of Japanese Industrial Standards item (2) (g) the so-called short-time current of middle regulation is meant " under rated condition; electric current is passed through the no abnormal electric current of circuit breaker in a second, being the alternating current component symmetry value in 1/2 cycle after short circuit takes place " under situation about exchanging.

As solving the measure that above-mentioned specified short-time current descends, though can strengthen the load of the contact pressure spring that forms the contact pressure between fixed contact and the moving contact big that, but the load of contact pressure spring becomes the load to the switching mechanism part in this case, has the problems such as switching durability reduction of circuit-breaker itself.

The present invention proposes for addressing the above problem just, at big electric current such as short circuit current from conductor flow during to movable body, utilize the electromagnetic repulsive force that produces between conductor and the movable body, the multi-pole circuit breaker that the specified short-time current that obtains contact mechanism part does not descend, the switching endurance quality of contact mechanism part does not reduce.

Summary of the invention

The multi-pole circuit breaker that the present invention is relevant, comprise a plurality of contact mechanism part that forms by the movable body of the moving contact of first conductor that fixed contact is set and setting and described fixed contact deciliter and second conductor that is connected with this movable body, can rotate freely the pivot section of maintenance, the switching mechanism part that described pivot section utilization is moved when described a plurality of contact mechanism part short circuit current flow is along the pivot section of prescribed direction rotation, and the linkage part that is configured between described a plurality of contact mechanism's part and the described pivot section and when prescribed direction is rotated, described fixed contact and moving contact is separated in described pivot section, described linkage part constitutes like this, make in the electromagnetic repulsive force that described each movable body produces when flowing through electric current in described a plurality of contact mechanism part, the described pivot section that the electromagnetic repulsive force that the effect of the electromagnetic repulsive force that at least one movable body produces produces with respect to other movable body causes is to play reciprocal effect to the rotation of described prescribed direction.

As mentioned above, according to multi-pole circuit breaker of the present invention, owing to be configured between a plurality of contact mechanism's parts and the pivot section, the linkage part that fixed contact and moving contact is separated in pivot section constitutes like this, make in the electromagnetic repulsive force that aforementioned each movable body produces when flowing through electric current in the aforementioned a plurality of contact mechanism part, the aforementioned pivot section that the electromagnetic repulsive force that the effect of the electromagnetic repulsive force that at least one movable body produces produces with respect to other movable body causes is to the rotation of stating prescribed direction, be to play reciprocal effect, therefore at big electric currents such as short circuit currents from conductor flow during to movable body, utilize the electromagnetic repulsive force that produces between conductor and the movable body, the specified short-time current that can access contact mechanism part does not descend, the multi-pole circuit breaker that the switching endurance quality of contact mechanism part does not reduce.

Description of drawings

Fig. 1 represents the plane graph of the multi-pole circuit breaker of the invention process form.

Fig. 2 represents to represent with the A-A of Fig. 1 and B-B cross-section front view the closure state figure of contact mechanism part.

The open mode figure of the contact mechanism part of Fig. 3 presentation graphs 2.

Fig. 4 represents to represent with the C-C cross-section front view of Fig. 1 the closure state figure of contact mechanism part.

The open mode figure of the contact mechanism part of Fig. 5 presentation graphs 4.

Label declaration

1a, 1b, 1c contact mechanism part, 2a, 2b, 2c linkage, 3 fixed contacts, 4 first conductors, 5 moving contacts, 6 movable bodys, 7 splitters, 9 second conductors, 11 fixed axis, 12 first connecting rods, 13 first movable axises, the 13a pivot, 14 second connecting rods, 15 second movable axises, 15a, 15b, 15c pivot, 16 arms, 17 pivots, the 17a pivot, 18 pivot section, 19 switching mechanism parts.

Embodiment

Example

Fig. 1 is the plane graph of the multi-pole circuit breaker of the invention process form.The closure state figure that represents contact mechanism part with A-A and the B-B cross-section front view of Fig. 1 shown in Figure 2.Figure 3 shows that the open mode figure of the contact mechanism part of Fig. 2.Figure 4 shows that the closure state figure that represents contact mechanism part with the C-C cross-section front view of Fig. 1.Figure 5 shows that the open mode figure of the contact mechanism part of Fig. 4.

In the drawings, multi-pole circuit breaker 100 has a plurality of contact part 1a of mechanism, 1b, 1c and linkage part 2a, 2b, the 2c that is contained in the housing 50.

Each part 1a of contact mechanism, 1b, 1c utilize same parts to constitute equally respectively.

In addition, though each linkage part 2a, 2b, 2c are with same parts, about constituting then as hereinafter described, the arm 16 of linkage part 2c and the position of rotation of pivot 17 are different with linkage part 2a and 2b.

The part 1a of contact mechanism, 1b, 1c are by the movable body 6 of the moving contact 5 of first conductor 4 that fixed contact 3 is set and setting and fixed contact deciliter, the splitter 7 that is formed by flexible material of fixedlying connected with this movable body 6, with fixing second conductor 9 of screw 8 and this splitter 7 and compress the holddown spring 10 that movable body 6 makes moving contact 5 and fixed contact 3 compress and constitute.

In addition, linkage part 2a, 2b, 2c are by the first connecting rod 12 that utilizes fixed axis 11 can rotate freely as pivot suspension and an end utilizes first movable axis 13 to keep and can rotate freely and the other end utilizes second movable axis 15 to keep and the second connecting rod 14 that can rotate freely constitutes with movable body 6 and first connecting rod 12.

In addition, be connected by the other end that utilizes second movable axis with second connecting rod 14 and the arm 16 that can rotate freely and the pivot 17 of fixedlying connected with arm 16 constitute pivot section.

Have, arm 16 must be fixedly connected at the position of rotation of regulation with respect to pivot 17 again, for example utilizes fixedly connected means such as welding to carry out fixedly connected.

Switching mechanism part 19 and pivot 17 tight fits, in the part 1a of contact mechanism, 1b, 1c, during big electric current such as short circuit current flow, utilize not shown overcurrent detecting device, 19 actions of switching mechanism part, pivot 17 rotations, the part 1a of contact mechanism, 1b, 1c are in open mode simultaneously.

In such structure, this example is set especially like this, make the second connecting rod 14 of linkage part 2c utilize the pivot 15c of second movable axis, 15 rotations, be that connecting line L with the pivot 13a of the pivot 17a of pivot section 17 and first movable axis 13 is a benchmark, the second connecting rod 14 that is positioned at linkage part 2a and 2b utilizes the pivot 15a of second movable axis, 15 rotations and the opposite side (Fig. 2 and Fig. 4) of 15b.

In addition, here because arm 16 is to utilize fixedly connected means such as welding to fixedly connected with pivot 17, so can set the position of rotation of arm 16 easily with respect to the pivot 17 of linkage part 2a and 2b and linkage part 2c.

The following describes the action of the multi-pole circuit breaker of the example that constitutes as mentioned above.

(1) be setting when following at the electric current that flows through multi-pole circuit breaker 100, each part 1a of contact mechanism, 1b, 1c utilize holddown spring 10 that moving contact 5 and fixed contact 3 are compressed, and electric current is from first conductor, 4 to second conductors 9 normally circulate (Fig. 2 and Fig. 4).

(2) at this moment flow to the electric current of second conductor 9 if become big electric current such as short circuit current from first conductor 4, then utilize the electric current that flows through fixed contact 3, moving contact 5 and movable body 6 from first conductor 4, will produce the electromagnetic repulsive force of arrow D direction at the movable body 6 of each part 1a of contact mechanism, 1b, 1c.

(3) therefore, the movable body 6 of each the part 1a of contact mechanism, 1b and 1c is a fulcrum with fixed axis 11, forms one along arrow D direction rotation (Fig. 2 and Fig. 4) with first connecting rod 12.

(4) among the part 1a of contact mechanism, 1b and the 1c, the movable body 6 of part 1a of contact mechanism and 1b makes second connecting rod 14 move along arrow D direction by first movable axis 13, makes pivot 17 along arrow E direction (clockwise direction) rotation (Fig. 2).

(5) on the other hand, though the movable body 6 of the part 1c of contact mechanism also makes second connecting rod 14 move along arrow D direction by first movable axis 13, but because its pivot 15c is connecting line L with the pivot 13a of the pivot 17a of pivot 17 and first movable axis 13 is benchmark, the second connecting rod 14 that is positioned at linkage part 2a and 2b utilizes the pivot 15a of second movable axis, 15 rotations and the opposite side of 15b, therefore makes pivot 17 along arrow F direction (counterclockwise) rotation (Fig. 4).

(6) result, owing to making movable body 6 (arrow E direction) rotation along clockwise direction of part 1a of contact mechanism and 1b, and in contrast, make the movable body 6 of the part 1c of contact mechanism rotate along arrow F direction, therefore movable body 6 descends along the revolving force of arrow E direction rotation, do not reduce by the contact pressure between such fixed contact 3 and the moving contact 5, be kept closed.

(7) then, utilize not shown overcurrent detecting device, 19 actions of switching mechanism part, pivot 17 rotations of pivot section 18, by linkage 2a, 2b and 2c, each fixed contact 5 of a plurality of contact part 1a of mechanism, 1b and 1c separates with moving contact 6, is in open mode.

(8) as mentioned above, owing under the state that the contact pressure that has suppressed between fixed contact 3 and the moving contact 5 reduces, carry out opening action, so the specified short-time current of contact mechanism part can not reduce.

According to experimental result, Japanese industry mark commentaries on classics JIS.C.83722 item (2) (g) the specified short-time current of middle regulation can be increased to more than the 65KA.

In addition, what the foregoing description illustrated is the situation of 3 polar circuit circuit breakers, but also identical for the situations such as 4 polar circuit circuit breakers that neutral pole is arranged.

The present invention can be used for the multi-pole circuit breaker that distribution is used.

Claims

1. a multi-pole circuit breaker is characterized in that, comprises

The a plurality of contact mechanism part that forms by the movable body of the moving contact of first conductor that fixed contact is set and setting and described fixed contact deciliter and second conductor that is connected with this movable body,

Can rotate freely the pivot section of maintenance, the switching mechanism part that described pivot section utilization is moved when described a plurality of contact mechanism part short circuit current flow is along the prescribed direction rotation, and

The linkage part that is configured between described a plurality of contact mechanism's part and the described pivot section and when prescribed direction is rotated, described fixed contact and moving contact is separated in described pivot section,

Described linkage part constitutes like this, make in the electromagnetic repulsive force that described each movable body produces when flowing through electric current in described a plurality of contact mechanism part, the described pivot section that the electromagnetic repulsive force that the effect of the electromagnetic repulsive force that at least one movable body produces produces with respect to other movable body causes is to play reciprocal effect to the rotation of described prescribed direction.

2. multi-pole circuit breaker as claimed in claim 1 is characterized in that,

Described linkage partly has and utilizes a first connecting rod that fixed axis can rotate freely as pivot suspension and an end to utilize the rotation of first movable axis and second connecting rod that the other end utilizes second movable axis to keep and can rotate freely in described pivot section, in partly at least one of described a plurality of contact mechanisms, make the pivot of described second movable axis, connecting line with the pivot of the pivot of described first movable axis and described pivot section is a benchmark, is positioned at the opposite side of pivot of the movable axis of other contact mechanism part.

3. multi-pole circuit breaker as claimed in claim 2 is characterized in that,

Described pivot section is by being connected with described a plurality of second connecting rods and a plurality of arms that can rotate freely and fixedly connected the pivot that is integral with these arms with the position relation of regulation and form.