JPH02207436A - Trip cross bar of circuit breaker - Google Patents

Abstract

PURPOSE:To easily installing a return spring and preventing the return spring from high temperature by arranging a spring for making a trip cross bar return with a flat spring and installing the flat spring into a spring installation slot provided along a partition wall. CONSTITUTION:A spring installation slot 31 is provided along a partition wall 30 at a case 28 side in vertical direction. A flat spring 32 for making a trip cross bar 2 return is embedded in the spring installation slot 31. When contact parting cutoff is completed, metallic particles are dispersed to the periphery with high-temperature gas according to arc produced across movable contact point 12A and a fixed contact point 11A. Since the flat spring 32 for making the trip cross bar 2 return is installed into the installation slot 31, the spring 32 is protected not to be exposed to the high-temperature gas or melted metallic particles. There is thus no degradation. Further, a troublesome process for hooking a spring in the case of using a coil spring can be saved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a trip crossbar of a circuit breaker,
Specifically, the present invention relates to an 11-year-old spring of a trisive crossbar that transmits the tripping action of the armature and bimetal to the opening/closing mechanism when an overcurrent occurs.

[Conventional technology]

Conventionally, in circuit breakers, the opening/closing mechanism that opens and closes the contacts and the tripping device are assembled and housed in an insulating case. The detection operation is configured to be transmitted to the opening/closing mechanism via the trip crossbar. by the way,
This trip crossbar is configured to be set to 11 at the same time when the opening/closing mechanism is reset by the operating handle, and for this reset, the reset strip 11 ring 1 is set to trip as shown in FIG. It was provided between the crossbar 2 and the phase separation wall 3 of the case.

That is, the reset spring 1 is connected to the locking arm 3A protruding from the phase separation wall 3 and the two locking arms of the trip crossbar 2.
is latched, and its spring force keeps the trip crossbar 2 biased in the clockwise direction.

[Problem to be solved by the invention]

However, in the trip crossbar 2 of such a conventional circuit breaker, the return spring (set spring) 1 is exposed to the same space 4 in which the opening/closing mechanism and the breaker (not shown) are incorporated. , the high-temperature gas containing molten metal generated from the cut-off part during cut-off is blown directly to the reset spring 1, and as a result, the streak 1
There was a problem in that the ring 1 became worn out (fatigue) or fused, and the trip crossbar 2 was not returned to its original position, making it impossible to set +1. In addition, the work of latching the reset spring 1 requires manpower, which makes it unsuitable for automation.

An object of the present invention is to focus on the above-mentioned conventional problems, and to solve the problems, it is an object of the present invention to provide a return spring that is easy to assemble and that can be protected from high-temperature gas. An object of the present invention is to provide an eleven-tube crossbar for a circuit breaker.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a trip crossbar of a circuit breaker that is provided across a partition wall that isolates phases and causes a switching mechanism to perform an opening operation in conjunction with an overcurrent detection mechanism. The spring for holding the trip crossbar in the return position is composed of a leaf spring, and the leaf spring is stored in a spring storage groove bored along the partition wall from the part of the partition wall that supports the trip crossbar. , the leaf spring is not exposed to the space between the phases.

[Effect]

According to the present invention, the return spring formed by the leaf spring of the trip crossbar engages with the trip crossbar in the spring storage groove bored in the partition wall supporting the trip crossbar to hold it in the return position. Therefore, the spring is not exposed to high-temperature gas containing molten metal particles scattered in the interphase space, and deterioration and burnout of the spring are prevented, and the return function of the trip crossbar can be safely maintained.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

FIG. 1 shows the configuration of a circuit breaker to which the present invention is applied.

11 is a fixed contact, 12 is a movable contact, 11A and 1
2A are a fixed contact and a movable contact, respectively, which are shown in a closed state in this example.

13 is a flexible conductor connecting the movable contactor 12 to the connection plate 14; 15 is a heater fixed to the flexible conductor 13 together with the fixed core 16; 17 is a terminal plate attached to the heater 15; In the closed circuit state, current flows from the fixed contact 11 to the movable contact 12 via the contacts 11A# and 12A, and from the movable contact 12 to the terminal plate 17 via the connection plate 14 and the heater 15.

In addition, 18 is an opening/closing mechanism consisting of 1 toggle and 4 mechanisms to control opening and closing, 19 is an operating lever, 20 is a replacement handle, 21
is connected to the opening/closing mechanism 18, and its claw portion is connected to the latch receiver 22.
The latch member 23 that is kept in a locked state is the opening/closing strip 11 ring. Therefore, in the closed circuit state shown in this figure, the latch receiver 22 and the retaining portion 2B of the trip crossbar 2 are maintained in a state where they are engaged with each other by l.

Reference numeral 24 denotes a return spring for the latch receiver that biases the latch receiver 22 toward the engaging portion 2B of the trip crossbar 2.

Furthermore, 25 is an armature that is rotatably maintained around the rotation center 25A, 26 is an armature spring, and 27 is a bimetal whose one end is fixed to the armature 25 and is automatically shut off. Further, here, 28 is a case, 29 is a cover fixed to the case 28,
As shown in FIG. 2, the case 28 and the cover 29 have a partition wall 30 visible for separating them from each other. However,
A spring storage groove 3 is vertically formed in the partition wall 30 on the case 28 side.
1 is drilled in this storage groove 31.
A leaf spring 32 for restoring is installed as shown in FIG. Reference numeral 2C designates a spring engagement portion protruding from the crossbar 2 to engage one end of the leaf spring 32.

In the circuit breaker configured in this manner, the line of action of the opening/closing spring 23 is changed via the opening/closing mechanism 18 by operating the operating handle 20, and the movable contact 12 is rotated by the reversal action, thereby performing the circuit opening operation. can be made to do so. Furthermore, when a large current such as a short-circuit current flows, the armature 25 is rotated counterclockwise around the rotation center 25A as a fulcrum due to the electromagnetic attraction force generated in the fixed core 16 fixed around the heater 15. By rotating the trip cross bar 2 in the same direction at its upper end, the state of engagement with the latch receiver 22 is relaxed.

Therefore, the latch receiver 22 is rotated clockwise by the spring force of the spring 24, the latch member 21 is rotated counterclockwise by the spring force of the opening/closing spring 23, and the movable contact 12 is rotated clockwise. Opening and cutting is completed by rotating it in the direction of . However, at the time of levering, metal particles are scattered around together with the high temperature gas due to the arc generated between the movable contact 12A and the fixed contact 11A. The return leaf spring 32 of the cross bar 2 is inserted into the spring storage groove 31 of the partition wall 30.
Since the spring 32 is housed in the spring 32, high temperature gas and molten metal particles are not applied to the spring 32, and the spring 32 is protected and does not deteriorate.

In addition, the diameter of the break can be changed by operating the operating handle 20 in the clockwise direction to adjust the diameter of the break with the latch member 21 and the latch receiver 22.
The reset piece 22A is pressed down and the latch receiver 22 is rotated counterclockwise to obtain the 11 set state between the latch and the trip crossbar 2, and the operating handle 20 can be opened and closed.

〔Effect of the invention〕

As described above, according to the present invention, the spring for restoring the trip crossbar is composed of a leaf spring, and the leaf spring is inserted along the partition wall from the part of the interphase partition wall that supports the trip crossbar. Since the leaf springs are housed in the spring storage grooves drilled in the spring and the trip crossbars are held in the return position, the leaf springs are not exposed to the space between the phases, and therefore, melting that occurs when the trip crossbar is shut off is avoided. The leaf spring is not exposed to high-temperature gas containing metal particles, which prevents the leaf spring from deteriorating or burning out, and eliminates the hassle of hanging the spring as with conventional coil springs. It can save labor and contribute to assembly automation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the configuration of a circuit breaker according to the present invention, FIG. 2 is a perspective view showing the configuration of an embodiment of the present invention, and FIG. 3 is a return trip crossbar according to the present invention. FIG. 4 is a cross-sectional view showing a state in which a spring is attached, and a perspective view of a conventional example. 2., Trip crossbar 2B...engaging part, 2C
... Spring locking part, 22 ... Latch receiver, 25 ... Armature, 27 ... Bimetal, 28 ... Case,
29...Cover 30...Partition wall, 31...Spring storage groove, wpRr=forcerhTBtipL4Wfr15-
/7Wtfrr7A 1st m

Claims (1)

[Claims] In a trip crossbar of a circuit breaker that is provided across a partition wall that isolates phases and causes an opening/closing mechanism to perform an opening operation in conjunction with an overcurrent detection mechanism, the trip crossbar is reset. A spring for holding the trip crossbar in position is constituted by a leaf spring, and the leaf spring is stored in a spring storage groove bored along the partition wall from a portion of the partition wall that supports the trip cross bar, and A trip crossbar for a circuit breaker, characterized in that a spring is not exposed to the space between the phases.